5299 lines
129 KiB
C
5299 lines
129 KiB
C
// L2TP Network Server
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// Adrian Kennard 2002
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// Copyright (c) 2003, 2004, 2005 Optus Internet Engineering
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// Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced
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// vim: sw=8 ts=8
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char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.117 2005/08/10 08:04:26 bodea Exp $";
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#include <arpa/inet.h>
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#include <assert.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <linux/if_tun.h>
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#define SYSLOG_NAMES
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#include <syslog.h>
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#include <malloc.h>
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#include <math.h>
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#include <net/route.h>
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#include <sys/mman.h>
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#include <netdb.h>
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#include <netinet/in.h>
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#include <netinet/ip6.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <ctype.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <sys/wait.h>
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#include <linux/if.h>
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#include <stddef.h>
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#include <time.h>
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#include <dlfcn.h>
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#include <unistd.h>
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#include <sched.h>
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#include <sys/sysinfo.h>
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#include <libcli.h>
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#include "md5.h"
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#include "l2tpns.h"
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#include "cluster.h"
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#include "plugin.h"
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#include "ll.h"
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#include "constants.h"
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#include "control.h"
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#include "util.h"
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#include "tbf.h"
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#ifdef BGP
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#include "bgp.h"
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#endif
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// Globals
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configt *config = NULL; // all configuration
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int tunfd = -1; // tun interface file handle. (network device)
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int udpfd = -1; // UDP file handle
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int controlfd = -1; // Control signal handle
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int clifd = -1; // Socket listening for CLI connections.
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int daefd = -1; // Socket listening for DAE connections.
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int snoopfd = -1; // UDP file handle for sending out intercept data
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int *radfds = NULL; // RADIUS requests file handles
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int ifrfd = -1; // File descriptor for routing, etc
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int ifr6fd = -1; // File descriptor for IPv6 routing, etc
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int rand_fd = -1; // Random data source
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int cluster_sockfd = -1; // Intra-cluster communications socket.
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int epollfd = -1; // event polling
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time_t basetime = 0; // base clock
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char hostname[1000] = ""; // us.
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static int tunidx; // ifr_ifindex of tun device
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static int syslog_log = 0; // are we logging to syslog
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static FILE *log_stream = 0; // file handle for direct logging (i.e. direct into file, not via syslog).
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uint32_t last_id = 0; // Unique ID for radius accounting
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struct cli_session_actions *cli_session_actions = NULL; // Pending session changes requested by CLI
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struct cli_tunnel_actions *cli_tunnel_actions = NULL; // Pending tunnel changes required by CLI
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static void *ip_hash[256]; // Mapping from IP address to session structures.
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struct ipv6radix {
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int sess;
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struct ipv6radix *branch;
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} ipv6_hash[256]; // Mapping from IPv6 address to session structures.
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// Traffic counters.
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static uint32_t udp_rx = 0, udp_rx_pkt = 0, udp_tx = 0;
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static uint32_t eth_rx = 0, eth_rx_pkt = 0;
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uint32_t eth_tx = 0;
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static uint32_t ip_pool_size = 1; // Size of the pool of addresses used for dynamic address allocation.
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time_t time_now = 0; // Current time in seconds since epoch.
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static char time_now_string[64] = {0}; // Current time as a string.
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char main_quit = 0; // True if we're in the process of exiting.
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linked_list *loaded_plugins;
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linked_list *plugins[MAX_PLUGIN_TYPES];
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#define membersize(STRUCT, MEMBER) sizeof(((STRUCT *)0)->MEMBER)
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#define CONFIG(NAME, MEMBER, TYPE) { NAME, offsetof(configt, MEMBER), membersize(configt, MEMBER), TYPE }
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config_descriptt config_values[] = {
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CONFIG("debug", debug, INT),
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CONFIG("log_file", log_filename, STRING),
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CONFIG("pid_file", pid_file, STRING),
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CONFIG("random_device", random_device, STRING),
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CONFIG("l2tp_secret", l2tpsecret, STRING),
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CONFIG("ppp_restart_time", ppp_restart_time, INT),
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CONFIG("ppp_max_configure", ppp_max_configure, INT),
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CONFIG("ppp_max_failure", ppp_max_failure, INT),
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CONFIG("primary_dns", default_dns1, IPv4),
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CONFIG("secondary_dns", default_dns2, IPv4),
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CONFIG("primary_radius", radiusserver[0], IPv4),
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CONFIG("secondary_radius", radiusserver[1], IPv4),
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CONFIG("primary_radius_port", radiusport[0], SHORT),
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CONFIG("secondary_radius_port", radiusport[1], SHORT),
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CONFIG("radius_accounting", radius_accounting, BOOL),
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CONFIG("radius_interim", radius_interim, INT),
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CONFIG("radius_secret", radiussecret, STRING),
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CONFIG("radius_authtypes", radius_authtypes_s, STRING),
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CONFIG("radius_dae_port", radius_dae_port, SHORT),
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CONFIG("allow_duplicate_users", allow_duplicate_users, BOOL),
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CONFIG("bind_address", bind_address, IPv4),
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CONFIG("peer_address", peer_address, IPv4),
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CONFIG("send_garp", send_garp, BOOL),
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CONFIG("throttle_speed", rl_rate, UNSIGNED_LONG),
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CONFIG("throttle_buckets", num_tbfs, INT),
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CONFIG("accounting_dir", accounting_dir, STRING),
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CONFIG("setuid", target_uid, INT),
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CONFIG("dump_speed", dump_speed, BOOL),
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CONFIG("multi_read_count", multi_read_count, INT),
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CONFIG("scheduler_fifo", scheduler_fifo, BOOL),
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CONFIG("lock_pages", lock_pages, BOOL),
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CONFIG("icmp_rate", icmp_rate, INT),
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CONFIG("packet_limit", max_packets, INT),
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CONFIG("cluster_address", cluster_address, IPv4),
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CONFIG("cluster_interface", cluster_interface, STRING),
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CONFIG("cluster_hb_interval", cluster_hb_interval, INT),
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CONFIG("cluster_hb_timeout", cluster_hb_timeout, INT),
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CONFIG("cluster_master_min_adv", cluster_master_min_adv, INT),
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CONFIG("ipv6_prefix", ipv6_prefix, IPv6),
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{ NULL, 0, 0, 0 },
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};
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static char *plugin_functions[] = {
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NULL,
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"plugin_pre_auth",
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"plugin_post_auth",
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"plugin_packet_rx",
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"plugin_packet_tx",
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"plugin_timer",
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"plugin_new_session",
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"plugin_kill_session",
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"plugin_control",
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"plugin_radius_response",
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"plugin_radius_reset",
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"plugin_become_master",
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"plugin_new_session_master",
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};
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#define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *))
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// Counters for shutdown sessions
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static sessiont shut_acct[8192];
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static sessionidt shut_acct_n = 0;
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tunnelt *tunnel = NULL; // Array of tunnel structures.
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sessiont *session = NULL; // Array of session structures.
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sessionlocalt *sess_local = NULL; // Array of local per-session counters.
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radiust *radius = NULL; // Array of radius structures.
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ippoolt *ip_address_pool = NULL; // Array of dynamic IP addresses.
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ip_filtert *ip_filters = NULL; // Array of named filters.
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static controlt *controlfree = 0;
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struct Tstats *_statistics = NULL;
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#ifdef RINGBUFFER
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struct Tringbuffer *ringbuffer = NULL;
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#endif
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static void cache_ipmap(in_addr_t ip, int s);
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static void uncache_ipmap(in_addr_t ip);
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static void cache_ipv6map(struct in6_addr ip, int prefixlen, int s);
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static void free_ip_address(sessionidt s);
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static void dump_acct_info(int all);
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static void sighup_handler(int sig);
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static void sigalrm_handler(int sig);
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static void shutdown_handler(int sig);
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static void sigchild_handler(int sig);
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static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response);
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static void update_config(void);
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static void read_config_file(void);
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static void initplugins(void);
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static int add_plugin(char *plugin_name);
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static int remove_plugin(char *plugin_name);
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static void plugins_done(void);
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static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen);
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static tunnelidt new_tunnel(void);
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static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len);
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// on slaves, alow BGP to withdraw cleanly before exiting
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#define QUIT_DELAY 5
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// quit actions (master)
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#define QUIT_FAILOVER 1 // SIGTERM: exit when all control messages have been acked (for cluster failover)
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#define QUIT_SHUTDOWN 2 // SIGQUIT: shutdown sessions/tunnels, reject new connections
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// return internal time (10ths since process startup), set f if given
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static clockt now(double *f)
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{
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struct timeval t;
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gettimeofday(&t, 0);
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if (f) *f = t.tv_sec + t.tv_usec / 1000000.0;
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return (t.tv_sec - basetime) * 10 + t.tv_usec / 100000 + 1;
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}
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// work out a retry time based on try number
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// This is a straight bounded exponential backoff.
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// Maximum re-try time is 32 seconds. (2^5).
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clockt backoff(uint8_t try)
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{
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if (try > 5) try = 5; // max backoff
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return now(NULL) + 10 * (1 << try);
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}
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//
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// Log a debug message. Typically called via the LOG macro
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//
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void _log(int level, sessionidt s, tunnelidt t, const char *format, ...)
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{
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static char message[65536] = {0};
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va_list ap;
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#ifdef RINGBUFFER
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if (ringbuffer)
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{
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if (++ringbuffer->tail >= RINGBUFFER_SIZE)
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ringbuffer->tail = 0;
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if (ringbuffer->tail == ringbuffer->head)
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if (++ringbuffer->head >= RINGBUFFER_SIZE)
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ringbuffer->head = 0;
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ringbuffer->buffer[ringbuffer->tail].level = level;
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ringbuffer->buffer[ringbuffer->tail].session = s;
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ringbuffer->buffer[ringbuffer->tail].tunnel = t;
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va_start(ap, format);
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vsnprintf(ringbuffer->buffer[ringbuffer->tail].message, 4095, format, ap);
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va_end(ap);
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}
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#endif
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if (config->debug < level) return;
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va_start(ap, format);
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vsnprintf(message, sizeof(message), format, ap);
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if (log_stream)
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fprintf(log_stream, "%s %02d/%02d %s", time_now_string, t, s, message);
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else if (syslog_log)
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syslog(level + 2, "%02d/%02d %s", t, s, message); // We don't need LOG_EMERG or LOG_ALERT
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va_end(ap);
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}
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void _log_hex(int level, const char *title, const uint8_t *data, int maxsize)
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{
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int i, j;
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const uint8_t *d = data;
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if (config->debug < level) return;
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// No support for _log_hex to syslog
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if (log_stream)
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{
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_log(level, 0, 0, "%s (%d bytes):\n", title, maxsize);
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setvbuf(log_stream, NULL, _IOFBF, 16384);
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for (i = 0; i < maxsize; )
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{
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fprintf(log_stream, "%4X: ", i);
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for (j = i; j < maxsize && j < (i + 16); j++)
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{
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fprintf(log_stream, "%02X ", d[j]);
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if (j == i + 7)
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fputs(": ", log_stream);
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}
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for (; j < i + 16; j++)
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{
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fputs(" ", log_stream);
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if (j == i + 7)
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fputs(": ", log_stream);
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}
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fputs(" ", log_stream);
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for (j = i; j < maxsize && j < (i + 16); j++)
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{
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if (d[j] >= 0x20 && d[j] < 0x7f && d[j] != 0x20)
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fputc(d[j], log_stream);
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else
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fputc('.', log_stream);
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if (j == i + 7)
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fputs(" ", log_stream);
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}
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i = j;
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fputs("\n", log_stream);
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}
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fflush(log_stream);
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setbuf(log_stream, NULL);
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}
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}
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// update a counter, accumulating 2^32 wraps
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void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta)
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{
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uint32_t new = *counter + delta;
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if (new < *counter)
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(*wrap)++;
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*counter = new;
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}
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// initialise the random generator
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static void initrandom(char *source)
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{
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static char path[sizeof(config->random_device)] = "*undefined*";
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// reinitialise only if we are forced to do so or if the config has changed
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if (source && !strncmp(path, source, sizeof(path)))
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return;
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// close previous source, if any
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if (rand_fd >= 0)
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close(rand_fd);
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rand_fd = -1;
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if (source)
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{
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// register changes
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snprintf(path, sizeof(path), "%s", source);
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if (*path == '/')
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{
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rand_fd = open(path, O_RDONLY|O_NONBLOCK);
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if (rand_fd < 0)
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LOG(0, 0, 0, "Error opening the random device %s: %s\n",
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path, strerror(errno));
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}
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}
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}
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// fill buffer with random data
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void random_data(uint8_t *buf, int len)
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{
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int n = 0;
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CSTAT(random_data);
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if (rand_fd >= 0)
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{
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n = read(rand_fd, buf, len);
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if (n >= len) return;
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if (n < 0)
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{
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if (errno != EAGAIN)
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{
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LOG(0, 0, 0, "Error reading from random source: %s\n",
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strerror(errno));
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// fall back to rand()
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initrandom(NULL);
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}
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n = 0;
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}
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}
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// append missing data
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while (n < len)
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// not using the low order bits from the prng stream
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buf[n++] = (rand() >> 4) & 0xff;
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}
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// Add a route
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//
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// This adds it to the routing table, advertises it
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// via BGP if enabled, and stuffs it into the
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// 'sessionbyip' cache.
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//
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// 'ip' and 'mask' must be in _host_ order.
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//
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static void routeset(sessionidt s, in_addr_t ip, in_addr_t mask, in_addr_t gw, int add)
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{
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struct rtentry r;
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int i;
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if (!mask) mask = 0xffffffff;
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ip &= mask; // Force the ip to be the first one in the route.
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memset(&r, 0, sizeof(r));
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r.rt_dev = config->tundevice;
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r.rt_dst.sa_family = AF_INET;
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*(uint32_t *) & (((struct sockaddr_in *) &r.rt_dst)->sin_addr.s_addr) = htonl(ip);
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r.rt_gateway.sa_family = AF_INET;
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*(uint32_t *) & (((struct sockaddr_in *) &r.rt_gateway)->sin_addr.s_addr) = htonl(gw);
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r.rt_genmask.sa_family = AF_INET;
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*(uint32_t *) & (((struct sockaddr_in *) &r.rt_genmask)->sin_addr.s_addr) = htonl(mask);
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r.rt_flags = (RTF_UP | RTF_STATIC);
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if (gw)
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r.rt_flags |= RTF_GATEWAY;
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else if (mask == 0xffffffff)
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r.rt_flags |= RTF_HOST;
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LOG(1, s, 0, "Route %s %s/%s%s%s\n", add ? "add" : "del",
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fmtaddr(htonl(ip), 0), fmtaddr(htonl(mask), 1),
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gw ? " via" : "", gw ? fmtaddr(htonl(gw), 2) : "");
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if (ioctl(ifrfd, add ? SIOCADDRT : SIOCDELRT, (void *) &r) < 0)
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LOG(0, 0, 0, "routeset() error in ioctl: %s\n", strerror(errno));
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#ifdef BGP
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if (add)
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bgp_add_route(htonl(ip), htonl(mask));
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else
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bgp_del_route(htonl(ip), htonl(mask));
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#endif /* BGP */
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// Add/Remove the IPs to the 'sessionbyip' cache.
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// Note that we add the zero address in the case of
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// a network route. Roll on CIDR.
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// Note that 's == 0' implies this is the address pool.
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// We still cache it here, because it will pre-fill
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// the malloc'ed tree.
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if (s)
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{
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if (!add) // Are we deleting a route?
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s = 0; // Caching the session as '0' is the same as uncaching.
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for (i = ip; (i&mask) == (ip&mask) ; ++i)
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cache_ipmap(i, s);
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}
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}
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void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add)
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{
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struct in6_rtmsg rt;
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char ipv6addr[INET6_ADDRSTRLEN];
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if (ifr6fd < 0)
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{
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LOG(0, 0, 0, "Asked to set IPv6 route, but IPv6 not setup.\n");
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return;
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}
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memset(&rt, 0, sizeof(rt));
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memcpy(&rt.rtmsg_dst, &ip, sizeof(struct in6_addr));
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rt.rtmsg_dst_len = prefixlen;
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rt.rtmsg_metric = 1;
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rt.rtmsg_flags = RTF_UP;
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rt.rtmsg_ifindex = tunidx;
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LOG(1, 0, 0, "Route %s %s/%d\n",
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add ? "add" : "del",
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inet_ntop(AF_INET6, &ip, ipv6addr, INET6_ADDRSTRLEN),
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prefixlen);
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|
|
if (ioctl(ifr6fd, add ? SIOCADDRT : SIOCDELRT, (void *) &rt) < 0)
|
|
LOG(0, 0, 0, "route6set() error in ioctl: %s\n",
|
|
strerror(errno));
|
|
|
|
// FIXME: need to add BGP routing (RFC2858)
|
|
|
|
if (s)
|
|
{
|
|
if (!add) // Are we deleting a route?
|
|
s = 0; // Caching the session as '0' is the same as uncaching.
|
|
|
|
cache_ipv6map(ip, prefixlen, s);
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
// defined in linux/ipv6.h, but tricky to include from user-space
|
|
// TODO: move routing to use netlink rather than ioctl
|
|
struct in6_ifreq {
|
|
struct in6_addr ifr6_addr;
|
|
__u32 ifr6_prefixlen;
|
|
unsigned int ifr6_ifindex;
|
|
};
|
|
|
|
//
|
|
// Set up TUN interface
|
|
static void inittun(void)
|
|
{
|
|
struct ifreq ifr;
|
|
struct in6_ifreq ifr6;
|
|
struct sockaddr_in sin = {0};
|
|
memset(&ifr, 0, sizeof(ifr));
|
|
ifr.ifr_flags = IFF_TUN;
|
|
|
|
tunfd = open(TUNDEVICE, O_RDWR);
|
|
if (tunfd < 0)
|
|
{ // fatal
|
|
LOG(0, 0, 0, "Can't open %s: %s\n", TUNDEVICE, strerror(errno));
|
|
exit(1);
|
|
}
|
|
{
|
|
int flags = fcntl(tunfd, F_GETFL, 0);
|
|
fcntl(tunfd, F_SETFL, flags | O_NONBLOCK);
|
|
}
|
|
if (ioctl(tunfd, TUNSETIFF, (void *) &ifr) < 0)
|
|
{
|
|
LOG(0, 0, 0, "Can't set tun interface: %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
assert(strlen(ifr.ifr_name) < sizeof(config->tundevice));
|
|
strncpy(config->tundevice, ifr.ifr_name, sizeof(config->tundevice) - 1);
|
|
ifrfd = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP);
|
|
|
|
sin.sin_family = AF_INET;
|
|
sin.sin_addr.s_addr = config->bind_address ? config->bind_address : 0x01010101; // 1.1.1.1
|
|
memcpy(&ifr.ifr_addr, &sin, sizeof(struct sockaddr));
|
|
|
|
if (ioctl(ifrfd, SIOCSIFADDR, (void *) &ifr) < 0)
|
|
{
|
|
LOG(0, 0, 0, "Error setting tun address: %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
/* Bump up the qlen to deal with bursts from the network */
|
|
ifr.ifr_qlen = 1000;
|
|
if (ioctl(ifrfd, SIOCSIFTXQLEN, (void *) &ifr) < 0)
|
|
{
|
|
LOG(0, 0, 0, "Error setting tun queue length: %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
ifr.ifr_flags = IFF_UP;
|
|
if (ioctl(ifrfd, SIOCSIFFLAGS, (void *) &ifr) < 0)
|
|
{
|
|
LOG(0, 0, 0, "Error setting tun flags: %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
if (ioctl(ifrfd, SIOCGIFINDEX, (void *) &ifr) < 0)
|
|
{
|
|
LOG(0, 0, 0, "Error getting tun ifindex: %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
tunidx = ifr.ifr_ifindex;
|
|
|
|
// Only setup IPv6 on the tun device if we have a configured prefix
|
|
if (config->ipv6_prefix.s6_addr[0]) {
|
|
ifr6fd = socket(PF_INET6, SOCK_DGRAM, 0);
|
|
|
|
// Link local address is FE80::1
|
|
memset(&ifr6.ifr6_addr, 0, sizeof(ifr6.ifr6_addr));
|
|
ifr6.ifr6_addr.s6_addr[0] = 0xFE;
|
|
ifr6.ifr6_addr.s6_addr[1] = 0x80;
|
|
ifr6.ifr6_addr.s6_addr[15] = 1;
|
|
ifr6.ifr6_prefixlen = 64;
|
|
ifr6.ifr6_ifindex = ifr.ifr_ifindex;
|
|
if (ioctl(ifr6fd, SIOCSIFADDR, (void *) &ifr6) < 0)
|
|
{
|
|
LOG(0, 0, 0, "Error setting tun IPv6 link local address:"
|
|
" %s\n", strerror(errno));
|
|
}
|
|
|
|
// Global address is prefix::1
|
|
memset(&ifr6.ifr6_addr, 0, sizeof(ifr6.ifr6_addr));
|
|
ifr6.ifr6_addr = config->ipv6_prefix;
|
|
ifr6.ifr6_addr.s6_addr[15] = 1;
|
|
ifr6.ifr6_prefixlen = 64;
|
|
ifr6.ifr6_ifindex = ifr.ifr_ifindex;
|
|
if (ioctl(ifr6fd, SIOCSIFADDR, (void *) &ifr6) < 0)
|
|
{
|
|
LOG(0, 0, 0, "Error setting tun IPv6 global address: %s\n",
|
|
strerror(errno));
|
|
}
|
|
}
|
|
}
|
|
|
|
// set up UDP ports
|
|
static void initudp(void)
|
|
{
|
|
int on = 1;
|
|
struct sockaddr_in addr;
|
|
|
|
// Tunnel
|
|
memset(&addr, 0, sizeof(addr));
|
|
addr.sin_family = AF_INET;
|
|
addr.sin_port = htons(L2TPPORT);
|
|
addr.sin_addr.s_addr = config->bind_address;
|
|
udpfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
|
|
setsockopt(udpfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
|
|
{
|
|
int flags = fcntl(udpfd, F_GETFL, 0);
|
|
fcntl(udpfd, F_SETFL, flags | O_NONBLOCK);
|
|
}
|
|
if (bind(udpfd, (void *) &addr, sizeof(addr)) < 0)
|
|
{
|
|
LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
|
|
// Control
|
|
memset(&addr, 0, sizeof(addr));
|
|
addr.sin_family = AF_INET;
|
|
addr.sin_port = htons(NSCTL_PORT);
|
|
controlfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
|
|
setsockopt(controlfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
|
|
if (bind(controlfd, (void *) &addr, sizeof(addr)) < 0)
|
|
{
|
|
LOG(0, 0, 0, "Error in control bind: %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
|
|
// Dynamic Authorization Extensions to RADIUS
|
|
memset(&addr, 0, sizeof(addr));
|
|
addr.sin_family = AF_INET;
|
|
addr.sin_port = htons(config->radius_dae_port);
|
|
daefd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
|
|
setsockopt(daefd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
|
|
if (bind(daefd, (void *) &addr, sizeof(addr)) < 0)
|
|
{
|
|
LOG(0, 0, 0, "Error in DAE bind: %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
|
|
// Intercept
|
|
snoopfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
|
|
}
|
|
|
|
//
|
|
// Find session by IP, < 1 for not found
|
|
//
|
|
// Confusingly enough, this 'ip' must be
|
|
// in _network_ order. This being the common
|
|
// case when looking it up from IP packet headers.
|
|
//
|
|
// We actually use this cache for two things.
|
|
// #1. For used IP addresses, this maps to the
|
|
// session ID that it's used by.
|
|
// #2. For un-used IP addresses, this maps to the
|
|
// index into the pool table that contains that
|
|
// IP address.
|
|
//
|
|
|
|
static int lookup_ipmap(in_addr_t ip)
|
|
{
|
|
uint8_t *a = (uint8_t *) &ip;
|
|
uint8_t **d = (uint8_t **) ip_hash;
|
|
|
|
if (!(d = (uint8_t **) d[(size_t) *a++])) return 0;
|
|
if (!(d = (uint8_t **) d[(size_t) *a++])) return 0;
|
|
if (!(d = (uint8_t **) d[(size_t) *a++])) return 0;
|
|
|
|
return (int) (intptr_t) d[(size_t) *a];
|
|
}
|
|
|
|
static int lookup_ipv6map(struct in6_addr ip)
|
|
{
|
|
struct ipv6radix *curnode;
|
|
int i;
|
|
int s;
|
|
char ipv6addr[INET6_ADDRSTRLEN];
|
|
|
|
curnode = &ipv6_hash[ip.s6_addr[0]];
|
|
i = 1;
|
|
s = curnode->sess;
|
|
|
|
while (s == 0 && i < 15 && curnode->branch != NULL)
|
|
{
|
|
curnode = &curnode->branch[ip.s6_addr[i]];
|
|
s = curnode->sess;
|
|
i++;
|
|
}
|
|
|
|
LOG(4, s, session[s].tunnel, "Looking up address %s and got %d\n",
|
|
inet_ntop(AF_INET6, &ip, ipv6addr,
|
|
INET6_ADDRSTRLEN),
|
|
s);
|
|
|
|
return s;
|
|
}
|
|
|
|
sessionidt sessionbyip(in_addr_t ip)
|
|
{
|
|
int s = lookup_ipmap(ip);
|
|
CSTAT(sessionbyip);
|
|
|
|
if (s > 0 && s < MAXSESSION && session[s].opened)
|
|
return (sessionidt) s;
|
|
|
|
return 0;
|
|
}
|
|
|
|
sessionidt sessionbyipv6(struct in6_addr ip)
|
|
{
|
|
int s;
|
|
CSTAT(sessionbyipv6);
|
|
|
|
if (!memcmp(&config->ipv6_prefix, &ip, 8) ||
|
|
(ip.s6_addr[0] == 0xFE &&
|
|
ip.s6_addr[1] == 0x80 &&
|
|
ip.s6_addr16[1] == 0 &&
|
|
ip.s6_addr16[2] == 0 &&
|
|
ip.s6_addr16[3] == 0)) {
|
|
s = lookup_ipmap(*(in_addr_t *) &ip.s6_addr[8]);
|
|
} else {
|
|
s = lookup_ipv6map(ip);
|
|
}
|
|
|
|
if (s > 0 && s < MAXSESSION && session[s].opened)
|
|
return s;
|
|
|
|
return 0;
|
|
}
|
|
|
|
//
|
|
// Take an IP address in HOST byte order and
|
|
// add it to the sessionid by IP cache.
|
|
//
|
|
// (It's actually cached in network order)
|
|
//
|
|
static void cache_ipmap(in_addr_t ip, int s)
|
|
{
|
|
in_addr_t nip = htonl(ip); // MUST be in network order. I.e. MSB must in be ((char *) (&ip))[0]
|
|
uint8_t *a = (uint8_t *) &nip;
|
|
uint8_t **d = (uint8_t **) ip_hash;
|
|
int i;
|
|
|
|
for (i = 0; i < 3; i++)
|
|
{
|
|
if (!d[(size_t) a[i]])
|
|
{
|
|
if (!(d[(size_t) a[i]] = calloc(256, sizeof(void *))))
|
|
return;
|
|
}
|
|
|
|
d = (uint8_t **) d[(size_t) a[i]];
|
|
}
|
|
|
|
d[(size_t) a[3]] = (uint8_t *) (intptr_t) s;
|
|
|
|
if (s > 0)
|
|
LOG(4, s, session[s].tunnel, "Caching ip address %s\n", fmtaddr(nip, 0));
|
|
|
|
else if (s == 0)
|
|
LOG(4, 0, 0, "Un-caching ip address %s\n", fmtaddr(nip, 0));
|
|
// else a map to an ip pool index.
|
|
}
|
|
|
|
static void uncache_ipmap(in_addr_t ip)
|
|
{
|
|
cache_ipmap(ip, 0); // Assign it to the NULL session.
|
|
}
|
|
|
|
static void cache_ipv6map(struct in6_addr ip, int prefixlen, int s)
|
|
{
|
|
int i;
|
|
int bytes;
|
|
struct ipv6radix *curnode;
|
|
char ipv6addr[INET6_ADDRSTRLEN];
|
|
|
|
curnode = &ipv6_hash[ip.s6_addr[0]];
|
|
|
|
bytes = prefixlen >> 3;
|
|
i = 1;
|
|
while (i < bytes) {
|
|
if (curnode->branch == NULL)
|
|
{
|
|
if (!(curnode->branch = calloc(256,
|
|
sizeof (struct ipv6radix))))
|
|
return;
|
|
}
|
|
curnode = &curnode->branch[ip.s6_addr[i]];
|
|
i++;
|
|
}
|
|
|
|
curnode->sess = s;
|
|
|
|
if (s > 0)
|
|
LOG(4, s, session[s].tunnel, "Caching ip address %s/%d\n",
|
|
inet_ntop(AF_INET6, &ip, ipv6addr,
|
|
INET6_ADDRSTRLEN),
|
|
prefixlen);
|
|
else if (s == 0)
|
|
LOG(4, 0, 0, "Un-caching ip address %s/%d\n",
|
|
inet_ntop(AF_INET6, &ip, ipv6addr,
|
|
INET6_ADDRSTRLEN),
|
|
prefixlen);
|
|
}
|
|
|
|
//
|
|
// CLI list to dump current ipcache.
|
|
//
|
|
int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc)
|
|
{
|
|
char **d = (char **) ip_hash, **e, **f, **g;
|
|
int i, j, k, l;
|
|
int count = 0;
|
|
|
|
if (CLI_HELP_REQUESTED)
|
|
return CLI_HELP_NO_ARGS;
|
|
|
|
cli_print(cli, "%7s %s", "Sess#", "IP Address");
|
|
|
|
for (i = 0; i < 256; ++i)
|
|
{
|
|
if (!d[i])
|
|
continue;
|
|
e = (char **) d[i];
|
|
for (j = 0; j < 256; ++j)
|
|
{
|
|
if (!e[j])
|
|
continue;
|
|
f = (char **) e[j];
|
|
for (k = 0; k < 256; ++k)
|
|
{
|
|
if (!f[k])
|
|
continue;
|
|
g = (char **)f[k];
|
|
for (l = 0; l < 256; ++l)
|
|
{
|
|
if (!g[l])
|
|
continue;
|
|
cli_print(cli, "%7d %d.%d.%d.%d", (int) (intptr_t) g[l], i, j, k, l);
|
|
++count;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
cli_print(cli, "%d entries in cache", count);
|
|
return CLI_OK;
|
|
}
|
|
|
|
|
|
// Find session by username, 0 for not found
|
|
// walled garden users aren't authenticated, so the username is
|
|
// reasonably useless. Ignore them to avoid incorrect actions
|
|
//
|
|
// This is VERY inefficent. Don't call it often. :)
|
|
//
|
|
sessionidt sessionbyuser(char *username)
|
|
{
|
|
int s;
|
|
CSTAT(sessionbyuser);
|
|
|
|
for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
|
|
{
|
|
if (!session[s].opened)
|
|
continue;
|
|
|
|
if (session[s].walled_garden)
|
|
continue; // Skip walled garden users.
|
|
|
|
if (!strncmp(session[s].user, username, 128))
|
|
return s;
|
|
|
|
}
|
|
return 0; // Not found.
|
|
}
|
|
|
|
void send_garp(in_addr_t ip)
|
|
{
|
|
int s;
|
|
struct ifreq ifr;
|
|
uint8_t mac[6];
|
|
|
|
s = socket(PF_INET, SOCK_DGRAM, 0);
|
|
if (s < 0)
|
|
{
|
|
LOG(0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno));
|
|
return;
|
|
}
|
|
memset(&ifr, 0, sizeof(ifr));
|
|
strncpy(ifr.ifr_name, "eth0", sizeof(ifr.ifr_name) - 1);
|
|
if (ioctl(s, SIOCGIFHWADDR, &ifr) < 0)
|
|
{
|
|
LOG(0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno));
|
|
close(s);
|
|
return;
|
|
}
|
|
memcpy(mac, &ifr.ifr_hwaddr.sa_data, 6*sizeof(char));
|
|
if (ioctl(s, SIOCGIFINDEX, &ifr) < 0)
|
|
{
|
|
LOG(0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno));
|
|
close(s);
|
|
return;
|
|
}
|
|
close(s);
|
|
sendarp(ifr.ifr_ifindex, mac, ip);
|
|
}
|
|
|
|
static sessiont *sessiontbysessionidt(sessionidt s)
|
|
{
|
|
if (!s || s >= MAXSESSION) return NULL;
|
|
return &session[s];
|
|
}
|
|
|
|
static sessionidt sessionidtbysessiont(sessiont *s)
|
|
{
|
|
sessionidt val = s-session;
|
|
if (s < session || val >= MAXSESSION) return 0;
|
|
return val;
|
|
}
|
|
|
|
// actually send a control message for a specific tunnel
|
|
void tunnelsend(uint8_t * buf, uint16_t l, tunnelidt t)
|
|
{
|
|
struct sockaddr_in addr;
|
|
|
|
CSTAT(tunnelsend);
|
|
|
|
if (!t)
|
|
{
|
|
static int backtrace_count = 0;
|
|
LOG(0, 0, t, "tunnelsend called with 0 as tunnel id\n");
|
|
STAT(tunnel_tx_errors);
|
|
log_backtrace(backtrace_count, 5)
|
|
return;
|
|
}
|
|
|
|
if (!tunnel[t].ip)
|
|
{
|
|
static int backtrace_count = 0;
|
|
LOG(1, 0, t, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
|
|
log_backtrace(backtrace_count, 5)
|
|
STAT(tunnel_tx_errors);
|
|
return;
|
|
}
|
|
|
|
memset(&addr, 0, sizeof(addr));
|
|
addr.sin_family = AF_INET;
|
|
*(uint32_t *) & addr.sin_addr = htonl(tunnel[t].ip);
|
|
addr.sin_port = htons(tunnel[t].port);
|
|
|
|
// sequence expected, if sequence in message
|
|
if (*buf & 0x08) *(uint16_t *) (buf + ((*buf & 0x40) ? 10 : 8)) = htons(tunnel[t].nr);
|
|
|
|
// If this is a control message, deal with retries
|
|
if (*buf & 0x80)
|
|
{
|
|
tunnel[t].last = time_now; // control message sent
|
|
tunnel[t].retry = backoff(tunnel[t].try); // when to resend
|
|
if (tunnel[t].try > 1)
|
|
{
|
|
STAT(tunnel_retries);
|
|
LOG(3, 0, t, "Control message resend try %d\n", tunnel[t].try);
|
|
}
|
|
}
|
|
|
|
if (sendto(udpfd, buf, l, 0, (void *) &addr, sizeof(addr)) < 0)
|
|
{
|
|
LOG(0, ntohs((*(uint16_t *) (buf + 6))), t, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n",
|
|
strerror(errno), udpfd, buf, l, inet_ntoa(addr.sin_addr));
|
|
STAT(tunnel_tx_errors);
|
|
return;
|
|
}
|
|
|
|
LOG_HEX(5, "Send Tunnel Data", buf, l);
|
|
STAT(tunnel_tx_packets);
|
|
INC_STAT(tunnel_tx_bytes, l);
|
|
}
|
|
|
|
//
|
|
// Tiny helper function to write data to
|
|
// the 'tun' device.
|
|
//
|
|
int tun_write(uint8_t * data, int size)
|
|
{
|
|
return write(tunfd, data, size);
|
|
}
|
|
|
|
// process outgoing (to tunnel) IP
|
|
//
|
|
static void processipout(uint8_t *buf, int len)
|
|
{
|
|
sessionidt s;
|
|
sessiont *sp;
|
|
tunnelidt t;
|
|
in_addr_t ip;
|
|
|
|
uint8_t *data = buf; // Keep a copy of the originals.
|
|
int size = len;
|
|
|
|
uint8_t b[MAXETHER + 20];
|
|
|
|
CSTAT(processipout);
|
|
|
|
if (len < MIN_IP_SIZE)
|
|
{
|
|
LOG(1, 0, 0, "Short IP, %d bytes\n", len);
|
|
STAT(tun_rx_errors);
|
|
return;
|
|
}
|
|
if (len >= MAXETHER)
|
|
{
|
|
LOG(1, 0, 0, "Oversize IP packet %d bytes\n", len);
|
|
STAT(tun_rx_errors);
|
|
return;
|
|
}
|
|
|
|
// Skip the tun header
|
|
buf += 4;
|
|
len -= 4;
|
|
|
|
// Got an IP header now
|
|
if (*(uint8_t *)(buf) >> 4 != 4)
|
|
{
|
|
LOG(1, 0, 0, "IP: Don't understand anything except IPv4\n");
|
|
return;
|
|
}
|
|
|
|
ip = *(uint32_t *)(buf + 16);
|
|
if (!(s = sessionbyip(ip)))
|
|
{
|
|
// Is this a packet for a session that doesn't exist?
|
|
static int rate = 0; // Number of ICMP packets we've sent this second.
|
|
static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
|
|
|
|
if (last != time_now)
|
|
{
|
|
last = time_now;
|
|
rate = 0;
|
|
}
|
|
|
|
if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
|
|
{
|
|
LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t *)(buf + 12), 0));
|
|
host_unreachable(*(in_addr_t *)(buf + 12), *(uint16_t *)(buf + 4),
|
|
config->bind_address ? config->bind_address : my_address, buf, len);
|
|
}
|
|
return;
|
|
}
|
|
t = session[s].tunnel;
|
|
sp = &session[s];
|
|
|
|
// DoS prevention: enforce a maximum number of packets per 0.1s for a session
|
|
if (config->max_packets > 0)
|
|
{
|
|
if (sess_local[s].last_packet_out == TIME)
|
|
{
|
|
int max = config->max_packets;
|
|
|
|
// All packets for throttled sessions are handled by the
|
|
// master, so further limit by using the throttle rate.
|
|
// A bit of a kludge, since throttle rate is in kbps,
|
|
// but should still be generous given our average DSL
|
|
// packet size is 200 bytes: a limit of 28kbps equates
|
|
// to around 180 packets per second.
|
|
if (!config->cluster_iam_master && sp->throttle_out && sp->throttle_out < max)
|
|
max = sp->throttle_out;
|
|
|
|
if (++sess_local[s].packets_out > max)
|
|
{
|
|
sess_local[s].packets_dropped++;
|
|
return;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (sess_local[s].packets_dropped)
|
|
{
|
|
INC_STAT(tun_rx_dropped, sess_local[s].packets_dropped);
|
|
LOG(3, s, t, "Dropped %u/%u packets to %s for %suser %s\n",
|
|
sess_local[s].packets_dropped, sess_local[s].packets_out,
|
|
fmtaddr(ip, 0), sp->throttle_out ? "throttled " : "",
|
|
sp->user);
|
|
}
|
|
|
|
sess_local[s].last_packet_out = TIME;
|
|
sess_local[s].packets_out = 1;
|
|
sess_local[s].packets_dropped = 0;
|
|
}
|
|
}
|
|
|
|
// run access-list if any
|
|
if (session[s].filter_out && !ip_filter(buf, len, session[s].filter_out - 1))
|
|
return;
|
|
|
|
if (sp->tbf_out)
|
|
{
|
|
// Are we throttling this session?
|
|
if (config->cluster_iam_master)
|
|
tbf_queue_packet(sp->tbf_out, data, size);
|
|
else
|
|
master_throttle_packet(sp->tbf_out, data, size);
|
|
return;
|
|
}
|
|
else if (sp->walled_garden && !config->cluster_iam_master)
|
|
{
|
|
// We are walled-gardening this
|
|
master_garden_packet(s, data, size);
|
|
return;
|
|
}
|
|
|
|
LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
|
|
|
|
// Add on L2TP header
|
|
{
|
|
uint8_t *p = makeppp(b, sizeof(b), buf, len, t, s, PPPIP);
|
|
if (!p) return;
|
|
tunnelsend(b, len + (p-b), t); // send it...
|
|
}
|
|
|
|
// Snooping this session, send it to intercept box
|
|
if (sp->snoop_ip && sp->snoop_port)
|
|
snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
|
|
|
|
increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
|
|
sp->cout_delta += len;
|
|
sp->pout++;
|
|
udp_tx += len;
|
|
|
|
sess_local[s].cout += len; // To send to master..
|
|
sess_local[s].pout++;
|
|
}
|
|
|
|
// process outgoing (to tunnel) IPv6
|
|
//
|
|
static void processipv6out(uint8_t * buf, int len)
|
|
{
|
|
sessionidt s;
|
|
sessiont *sp;
|
|
tunnelidt t;
|
|
in_addr_t ip;
|
|
struct in6_addr ip6;
|
|
|
|
uint8_t *data = buf; // Keep a copy of the originals.
|
|
int size = len;
|
|
|
|
uint8_t b[MAXETHER + 20];
|
|
|
|
CSTAT(processipv6out);
|
|
|
|
if (len < MIN_IP_SIZE)
|
|
{
|
|
LOG(1, 0, 0, "Short IPv6, %d bytes\n", len);
|
|
STAT(tunnel_tx_errors);
|
|
return;
|
|
}
|
|
if (len >= MAXETHER)
|
|
{
|
|
LOG(1, 0, 0, "Oversize IPv6 packet %d bytes\n", len);
|
|
STAT(tunnel_tx_errors);
|
|
return;
|
|
}
|
|
|
|
// Skip the tun header
|
|
buf += 4;
|
|
len -= 4;
|
|
|
|
// Got an IP header now
|
|
if (*(uint8_t *)(buf) >> 4 != 6)
|
|
{
|
|
LOG(1, 0, 0, "IP: Don't understand anything except IPv6\n");
|
|
return;
|
|
}
|
|
|
|
ip6 = *(struct in6_addr *)(buf+24);
|
|
s = sessionbyipv6(ip6);
|
|
|
|
if (s == 0)
|
|
{
|
|
ip = *(uint32_t *)(buf + 32);
|
|
s = sessionbyip(ip);
|
|
}
|
|
|
|
if (s == 0)
|
|
{
|
|
// Is this a packet for a session that doesn't exist?
|
|
static int rate = 0; // Number of ICMP packets we've sent this second.
|
|
static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
|
|
|
|
if (last != time_now)
|
|
{
|
|
last = time_now;
|
|
rate = 0;
|
|
}
|
|
|
|
if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
|
|
{
|
|
// FIXME: Should send icmp6 host unreachable
|
|
}
|
|
return;
|
|
}
|
|
t = session[s].tunnel;
|
|
sp = &session[s];
|
|
|
|
// FIXME: add DoS prevention/filters?
|
|
|
|
if (sp->tbf_out)
|
|
{
|
|
// Are we throttling this session?
|
|
if (config->cluster_iam_master)
|
|
tbf_queue_packet(sp->tbf_out, data, size);
|
|
else
|
|
master_throttle_packet(sp->tbf_out, data, size);
|
|
return;
|
|
}
|
|
else if (sp->walled_garden && !config->cluster_iam_master)
|
|
{
|
|
// We are walled-gardening this
|
|
master_garden_packet(s, data, size);
|
|
return;
|
|
}
|
|
|
|
LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
|
|
|
|
// Add on L2TP header
|
|
{
|
|
uint8_t *p = makeppp(b, sizeof(b), buf, len, t, s, PPPIPV6);
|
|
if (!p) return;
|
|
tunnelsend(b, len + (p-b), t); // send it...
|
|
}
|
|
|
|
// Snooping this session, send it to intercept box
|
|
if (sp->snoop_ip && sp->snoop_port)
|
|
snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
|
|
|
|
increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
|
|
sp->cout_delta += len;
|
|
sp->pout++;
|
|
udp_tx += len;
|
|
|
|
sess_local[s].cout += len; // To send to master..
|
|
sess_local[s].pout++;
|
|
}
|
|
|
|
//
|
|
// Helper routine for the TBF filters.
|
|
// Used to send queued data in to the user!
|
|
//
|
|
static void send_ipout(sessionidt s, uint8_t *buf, int len)
|
|
{
|
|
sessiont *sp;
|
|
tunnelidt t;
|
|
in_addr_t ip;
|
|
|
|
uint8_t b[MAXETHER + 20];
|
|
|
|
if (len < 0 || len > MAXETHER)
|
|
{
|
|
LOG(1, 0, 0, "Odd size IP packet: %d bytes\n", len);
|
|
return;
|
|
}
|
|
|
|
// Skip the tun header
|
|
buf += 4;
|
|
len -= 4;
|
|
|
|
ip = *(in_addr_t *)(buf + 16);
|
|
|
|
if (!session[s].ip)
|
|
return;
|
|
|
|
t = session[s].tunnel;
|
|
sp = &session[s];
|
|
|
|
LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
|
|
|
|
// Add on L2TP header
|
|
{
|
|
uint8_t *p = makeppp(b, sizeof(b), buf, len, t, s, PPPIP);
|
|
if (!p) return;
|
|
tunnelsend(b, len + (p-b), t); // send it...
|
|
}
|
|
|
|
// Snooping this session.
|
|
if (sp->snoop_ip && sp->snoop_port)
|
|
snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
|
|
|
|
increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
|
|
sp->cout_delta += len;
|
|
sp->pout++;
|
|
udp_tx += len;
|
|
|
|
sess_local[s].cout += len; // To send to master..
|
|
sess_local[s].pout++;
|
|
}
|
|
|
|
// add an AVP (16 bit)
|
|
static void control16(controlt * c, uint16_t avp, uint16_t val, uint8_t m)
|
|
{
|
|
uint16_t l = (m ? 0x8008 : 0x0008);
|
|
*(uint16_t *) (c->buf + c->length + 0) = htons(l);
|
|
*(uint16_t *) (c->buf + c->length + 2) = htons(0);
|
|
*(uint16_t *) (c->buf + c->length + 4) = htons(avp);
|
|
*(uint16_t *) (c->buf + c->length + 6) = htons(val);
|
|
c->length += 8;
|
|
}
|
|
|
|
// add an AVP (32 bit)
|
|
static void control32(controlt * c, uint16_t avp, uint32_t val, uint8_t m)
|
|
{
|
|
uint16_t l = (m ? 0x800A : 0x000A);
|
|
*(uint16_t *) (c->buf + c->length + 0) = htons(l);
|
|
*(uint16_t *) (c->buf + c->length + 2) = htons(0);
|
|
*(uint16_t *) (c->buf + c->length + 4) = htons(avp);
|
|
*(uint32_t *) (c->buf + c->length + 6) = htonl(val);
|
|
c->length += 10;
|
|
}
|
|
|
|
// add an AVP (string)
|
|
static void controls(controlt * c, uint16_t avp, char *val, uint8_t m)
|
|
{
|
|
uint16_t l = ((m ? 0x8000 : 0) + strlen(val) + 6);
|
|
*(uint16_t *) (c->buf + c->length + 0) = htons(l);
|
|
*(uint16_t *) (c->buf + c->length + 2) = htons(0);
|
|
*(uint16_t *) (c->buf + c->length + 4) = htons(avp);
|
|
memcpy(c->buf + c->length + 6, val, strlen(val));
|
|
c->length += 6 + strlen(val);
|
|
}
|
|
|
|
// add a binary AVP
|
|
static void controlb(controlt * c, uint16_t avp, uint8_t *val, unsigned int len, uint8_t m)
|
|
{
|
|
uint16_t l = ((m ? 0x8000 : 0) + len + 6);
|
|
*(uint16_t *) (c->buf + c->length + 0) = htons(l);
|
|
*(uint16_t *) (c->buf + c->length + 2) = htons(0);
|
|
*(uint16_t *) (c->buf + c->length + 4) = htons(avp);
|
|
memcpy(c->buf + c->length + 6, val, len);
|
|
c->length += 6 + len;
|
|
}
|
|
|
|
// new control connection
|
|
static controlt *controlnew(uint16_t mtype)
|
|
{
|
|
controlt *c;
|
|
if (!controlfree)
|
|
c = malloc(sizeof(controlt));
|
|
else
|
|
{
|
|
c = controlfree;
|
|
controlfree = c->next;
|
|
}
|
|
assert(c);
|
|
c->next = 0;
|
|
*(uint16_t *) (c->buf + 0) = htons(0xC802); // flags/ver
|
|
c->length = 12;
|
|
control16(c, 0, mtype, 1);
|
|
return c;
|
|
}
|
|
|
|
// send zero block if nothing is waiting
|
|
// (ZLB send).
|
|
static void controlnull(tunnelidt t)
|
|
{
|
|
uint8_t buf[12];
|
|
if (tunnel[t].controlc) // Messages queued; They will carry the ack.
|
|
return;
|
|
|
|
*(uint16_t *) (buf + 0) = htons(0xC802); // flags/ver
|
|
*(uint16_t *) (buf + 2) = htons(12); // length
|
|
*(uint16_t *) (buf + 4) = htons(tunnel[t].far); // tunnel
|
|
*(uint16_t *) (buf + 6) = htons(0); // session
|
|
*(uint16_t *) (buf + 8) = htons(tunnel[t].ns); // sequence
|
|
*(uint16_t *) (buf + 10) = htons(tunnel[t].nr); // sequence
|
|
tunnelsend(buf, 12, t);
|
|
}
|
|
|
|
// add a control message to a tunnel, and send if within window
|
|
static void controladd(controlt * c, tunnelidt t, sessionidt far)
|
|
{
|
|
*(uint16_t *) (c->buf + 2) = htons(c->length); // length
|
|
*(uint16_t *) (c->buf + 4) = htons(tunnel[t].far); // tunnel
|
|
*(uint16_t *) (c->buf + 6) = htons(far); // session
|
|
*(uint16_t *) (c->buf + 8) = htons(tunnel[t].ns); // sequence
|
|
tunnel[t].ns++; // advance sequence
|
|
// link in message in to queue
|
|
if (tunnel[t].controlc)
|
|
tunnel[t].controle->next = c;
|
|
else
|
|
tunnel[t].controls = c;
|
|
|
|
tunnel[t].controle = c;
|
|
tunnel[t].controlc++;
|
|
|
|
// send now if space in window
|
|
if (tunnel[t].controlc <= tunnel[t].window)
|
|
{
|
|
tunnel[t].try = 0; // first send
|
|
tunnelsend(c->buf, c->length, t);
|
|
}
|
|
}
|
|
|
|
//
|
|
// Throttle or Unthrottle a session
|
|
//
|
|
// Throttle the data from/to through a session to no more than
|
|
// 'rate_in' kbit/sec in (from user) or 'rate_out' kbit/sec out (to
|
|
// user).
|
|
//
|
|
// If either value is -1, the current value is retained for that
|
|
// direction.
|
|
//
|
|
void throttle_session(sessionidt s, int rate_in, int rate_out)
|
|
{
|
|
if (!session[s].opened)
|
|
return; // No-one home.
|
|
|
|
if (!*session[s].user)
|
|
return; // User not logged in
|
|
|
|
if (rate_in >= 0)
|
|
{
|
|
int bytes = rate_in * 1024 / 8; // kbits to bytes
|
|
if (session[s].tbf_in)
|
|
free_tbf(session[s].tbf_in);
|
|
|
|
if (rate_in > 0)
|
|
session[s].tbf_in = new_tbf(s, bytes * 2, bytes, send_ipin);
|
|
else
|
|
session[s].tbf_in = 0;
|
|
|
|
session[s].throttle_in = rate_in;
|
|
}
|
|
|
|
if (rate_out >= 0)
|
|
{
|
|
int bytes = rate_out * 1024 / 8;
|
|
if (session[s].tbf_out)
|
|
free_tbf(session[s].tbf_out);
|
|
|
|
if (rate_out > 0)
|
|
session[s].tbf_out = new_tbf(s, bytes * 2, bytes, send_ipout);
|
|
else
|
|
session[s].tbf_out = 0;
|
|
|
|
session[s].throttle_out = rate_out;
|
|
}
|
|
}
|
|
|
|
// add/remove filters from session (-1 = no change)
|
|
void filter_session(sessionidt s, int filter_in, int filter_out)
|
|
{
|
|
if (!session[s].opened)
|
|
return; // No-one home.
|
|
|
|
if (!*session[s].user)
|
|
return; // User not logged in
|
|
|
|
// paranoia
|
|
if (filter_in > MAXFILTER) filter_in = -1;
|
|
if (filter_out > MAXFILTER) filter_out = -1;
|
|
if (session[s].filter_in > MAXFILTER) session[s].filter_in = 0;
|
|
if (session[s].filter_out > MAXFILTER) session[s].filter_out = 0;
|
|
|
|
if (filter_in >= 0)
|
|
{
|
|
if (session[s].filter_in)
|
|
ip_filters[session[s].filter_in - 1].used--;
|
|
|
|
if (filter_in > 0)
|
|
ip_filters[filter_in - 1].used++;
|
|
|
|
session[s].filter_in = filter_in;
|
|
}
|
|
|
|
if (filter_out >= 0)
|
|
{
|
|
if (session[s].filter_out)
|
|
ip_filters[session[s].filter_out - 1].used--;
|
|
|
|
if (filter_out > 0)
|
|
ip_filters[filter_out - 1].used++;
|
|
|
|
session[s].filter_out = filter_out;
|
|
}
|
|
}
|
|
|
|
// start tidy shutdown of session
|
|
void sessionshutdown(sessionidt s, char *reason, int result, int error)
|
|
{
|
|
int walled_garden = session[s].walled_garden;
|
|
|
|
|
|
CSTAT(sessionshutdown);
|
|
|
|
if (!session[s].opened)
|
|
{
|
|
LOG(3, s, session[s].tunnel, "Called sessionshutdown on an unopened session.\n");
|
|
return; // not a live session
|
|
}
|
|
|
|
if (!session[s].die)
|
|
{
|
|
struct param_kill_session data = { &tunnel[session[s].tunnel], &session[s] };
|
|
LOG(2, s, session[s].tunnel, "Shutting down session %d: %s\n", s, reason);
|
|
run_plugins(PLUGIN_KILL_SESSION, &data);
|
|
}
|
|
|
|
if (session[s].ip && !walled_garden && !session[s].die)
|
|
{
|
|
// RADIUS Stop message
|
|
uint16_t r = radiusnew(s);
|
|
if (r)
|
|
{
|
|
// stop, if not already trying
|
|
if (radius[r].state != RADIUSSTOP)
|
|
radiussend(r, RADIUSSTOP);
|
|
}
|
|
else
|
|
LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Stop message\n");
|
|
|
|
// Save counters to dump to accounting file
|
|
if (*config->accounting_dir && shut_acct_n < sizeof(shut_acct) / sizeof(*shut_acct))
|
|
memcpy(&shut_acct[shut_acct_n++], &session[s], sizeof(session[s]));
|
|
}
|
|
|
|
if (session[s].ip)
|
|
{ // IP allocated, clear and unroute
|
|
int r;
|
|
int routed = 0;
|
|
for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
|
|
{
|
|
if ((session[s].ip & session[s].route[r].mask) ==
|
|
(session[s].route[r].ip & session[s].route[r].mask))
|
|
routed++;
|
|
|
|
routeset(s, session[s].route[r].ip, session[s].route[r].mask, 0, 0);
|
|
session[s].route[r].ip = 0;
|
|
}
|
|
|
|
if (session[s].ip_pool_index == -1) // static ip
|
|
{
|
|
if (!routed) routeset(s, session[s].ip, 0, 0, 0);
|
|
session[s].ip = 0;
|
|
}
|
|
else
|
|
free_ip_address(s);
|
|
|
|
// unroute IPv6, if setup
|
|
if (session[s].ppp.ipv6cp == Opened && session[s].ipv6prefixlen)
|
|
route6set(s, session[s].ipv6route, session[s].ipv6prefixlen, 0);
|
|
}
|
|
|
|
if (session[s].throttle_in || session[s].throttle_out) // Unthrottle if throttled.
|
|
throttle_session(s, 0, 0);
|
|
|
|
if (result)
|
|
{ // Send CDN
|
|
controlt *c = controlnew(14); // sending CDN
|
|
if (error)
|
|
{
|
|
uint8_t buf[4];
|
|
*(uint16_t *) buf = htons(result);
|
|
*(uint16_t *) (buf+2) = htons(error);
|
|
controlb(c, 1, buf, 4, 1);
|
|
}
|
|
else
|
|
control16(c, 1, result, 1);
|
|
|
|
control16(c, 14, s, 1); // assigned session (our end)
|
|
controladd(c, session[s].tunnel, session[s].far); // send the message
|
|
}
|
|
|
|
if (!session[s].die)
|
|
session[s].die = TIME + 150; // Clean up in 15 seconds
|
|
|
|
// update filter refcounts
|
|
if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
|
|
if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
|
|
|
|
// clear PPP state
|
|
memset(&session[s].ppp, 0, sizeof(session[s].ppp));
|
|
sess_local[s].lcp.restart = 0;
|
|
sess_local[s].ipcp.restart = 0;
|
|
sess_local[s].ipv6cp.restart = 0;
|
|
sess_local[s].ccp.restart = 0;
|
|
|
|
cluster_send_session(s);
|
|
}
|
|
|
|
void sendipcp(tunnelidt t, sessionidt s)
|
|
{
|
|
uint8_t buf[MAXCONTROL];
|
|
uint8_t *q;
|
|
|
|
CSTAT(sendipcp);
|
|
|
|
if (!session[s].unique_id)
|
|
{
|
|
if (!++last_id) ++last_id; // skip zero
|
|
session[s].unique_id = last_id;
|
|
}
|
|
|
|
q = makeppp(buf,sizeof(buf), 0, 0, t, s, PPPIPCP);
|
|
if (!q) return;
|
|
|
|
*q = ConfigReq;
|
|
q[1] = session[s].unique_id & 0xf; // ID, dont care, we only send one type of request
|
|
*(uint16_t *) (q + 2) = htons(10); // packet length
|
|
q[4] = 3; // ip address option
|
|
q[5] = 6; // option length
|
|
*(in_addr_t *) (q + 6) = config->peer_address ? config->peer_address :
|
|
config->bind_address ? config->bind_address :
|
|
my_address; // send my IP
|
|
|
|
tunnelsend(buf, 10 + (q - buf), t); // send it
|
|
}
|
|
|
|
void sendipv6cp(tunnelidt t, sessionidt s)
|
|
{
|
|
uint8_t buf[MAXCONTROL];
|
|
uint8_t *q;
|
|
|
|
CSTAT(sendipv6cp);
|
|
|
|
q = makeppp(buf,sizeof(buf), 0, 0, t, s, PPPIPV6CP);
|
|
if (!q) return;
|
|
|
|
*q = ConfigReq;
|
|
q[1] = session[s].unique_id & 0xf; // ID, don't care, we
|
|
// only send one type
|
|
// of request
|
|
*(uint16_t *) (q + 2) = htons(14);
|
|
q[4] = 1; // interface identifier option
|
|
q[5] = 10; // option length
|
|
*(uint32_t *) (q + 6) = 0; // We'll be prefix::1
|
|
*(uint32_t *) (q + 10) = 0;
|
|
q[13] = 1;
|
|
|
|
tunnelsend(buf, 14 + (q - buf), t); // send it
|
|
}
|
|
|
|
static void sessionclear(sessionidt s)
|
|
{
|
|
memset(&session[s], 0, sizeof(session[s]));
|
|
memset(&sess_local[s], 0, sizeof(sess_local[s]));
|
|
memset(&cli_session_actions[s], 0, sizeof(cli_session_actions[s]));
|
|
|
|
session[s].tunnel = T_FREE; // Mark it as free.
|
|
session[s].next = sessionfree;
|
|
sessionfree = s;
|
|
}
|
|
|
|
// kill a session now
|
|
void sessionkill(sessionidt s, char *reason)
|
|
{
|
|
|
|
CSTAT(sessionkill);
|
|
|
|
if (!session[s].opened) // not alive
|
|
return;
|
|
|
|
if (session[s].next)
|
|
{
|
|
LOG(0, s, session[s].tunnel, "Tried to kill a session with next pointer set (%d)\n", session[s].next);
|
|
return;
|
|
}
|
|
|
|
session[s].die = TIME;
|
|
sessionshutdown(s, reason, 3, 0); // close radius/routes, etc.
|
|
if (sess_local[s].radius)
|
|
radiusclear(sess_local[s].radius, s); // cant send clean accounting data, session is killed
|
|
|
|
LOG(2, s, session[s].tunnel, "Kill session %d (%s): %s\n", s, session[s].user, reason);
|
|
sessionclear(s);
|
|
cluster_send_session(s);
|
|
}
|
|
|
|
static void tunnelclear(tunnelidt t)
|
|
{
|
|
if (!t) return;
|
|
memset(&tunnel[t], 0, sizeof(tunnel[t]));
|
|
tunnel[t].state = TUNNELFREE;
|
|
}
|
|
|
|
// kill a tunnel now
|
|
static void tunnelkill(tunnelidt t, char *reason)
|
|
{
|
|
sessionidt s;
|
|
controlt *c;
|
|
|
|
CSTAT(tunnelkill);
|
|
|
|
tunnel[t].state = TUNNELDIE;
|
|
|
|
// free control messages
|
|
while ((c = tunnel[t].controls))
|
|
{
|
|
controlt * n = c->next;
|
|
tunnel[t].controls = n;
|
|
tunnel[t].controlc--;
|
|
c->next = controlfree;
|
|
controlfree = c;
|
|
}
|
|
// kill sessions
|
|
for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
|
|
if (session[s].tunnel == t)
|
|
sessionkill(s, reason);
|
|
|
|
// free tunnel
|
|
tunnelclear(t);
|
|
LOG(1, 0, t, "Kill tunnel %d: %s\n", t, reason);
|
|
cli_tunnel_actions[t].action = 0;
|
|
cluster_send_tunnel(t);
|
|
}
|
|
|
|
// shut down a tunnel cleanly
|
|
static void tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg)
|
|
{
|
|
sessionidt s;
|
|
|
|
CSTAT(tunnelshutdown);
|
|
|
|
if (!tunnel[t].last || !tunnel[t].far || tunnel[t].state == TUNNELFREE)
|
|
{
|
|
// never set up, can immediately kill
|
|
tunnelkill(t, reason);
|
|
return;
|
|
}
|
|
LOG(1, 0, t, "Shutting down tunnel %d (%s)\n", t, reason);
|
|
|
|
// close session
|
|
for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
|
|
if (session[s].tunnel == t)
|
|
sessionshutdown(s, reason, 0, 0);
|
|
|
|
tunnel[t].state = TUNNELDIE;
|
|
tunnel[t].die = TIME + 700; // Clean up in 70 seconds
|
|
cluster_send_tunnel(t);
|
|
// TBA - should we wait for sessions to stop?
|
|
if (result)
|
|
{
|
|
controlt *c = controlnew(4); // sending StopCCN
|
|
if (error)
|
|
{
|
|
uint8_t buf[64];
|
|
int l = 4;
|
|
*(uint16_t *) buf = htons(result);
|
|
*(uint16_t *) (buf+2) = htons(error);
|
|
if (msg)
|
|
{
|
|
int m = strlen(msg);
|
|
if (m + 4 > sizeof(buf))
|
|
m = sizeof(buf) - 4;
|
|
|
|
memcpy(buf+4, msg, m);
|
|
l += m;
|
|
}
|
|
|
|
controlb(c, 1, buf, l, 1);
|
|
}
|
|
else
|
|
control16(c, 1, result, 1);
|
|
|
|
control16(c, 9, t, 1); // assigned tunnel (our end)
|
|
controladd(c, t, 0); // send the message
|
|
}
|
|
}
|
|
|
|
// read and process packet on tunnel (UDP)
|
|
void processudp(uint8_t *buf, int len, struct sockaddr_in *addr)
|
|
{
|
|
uint8_t *chapresponse = NULL;
|
|
uint16_t l = len, t = 0, s = 0, ns = 0, nr = 0;
|
|
uint8_t *p = buf + 2;
|
|
|
|
|
|
CSTAT(processudp);
|
|
|
|
udp_rx += len;
|
|
udp_rx_pkt++;
|
|
LOG_HEX(5, "UDP Data", buf, len);
|
|
STAT(tunnel_rx_packets);
|
|
INC_STAT(tunnel_rx_bytes, len);
|
|
if (len < 6)
|
|
{
|
|
LOG(1, 0, 0, "Short UDP, %d bytes\n", len);
|
|
STAT(tunnel_rx_errors);
|
|
return;
|
|
}
|
|
if ((buf[1] & 0x0F) != 2)
|
|
{
|
|
LOG(1, 0, 0, "Bad L2TP ver %d\n", (buf[1] & 0x0F) != 2);
|
|
STAT(tunnel_rx_errors);
|
|
return;
|
|
}
|
|
if (*buf & 0x40)
|
|
{ // length
|
|
l = ntohs(*(uint16_t *) p);
|
|
p += 2;
|
|
}
|
|
t = ntohs(*(uint16_t *) p);
|
|
p += 2;
|
|
s = ntohs(*(uint16_t *) p);
|
|
p += 2;
|
|
if (s >= MAXSESSION)
|
|
{
|
|
LOG(1, s, t, "Received UDP packet with invalid session ID\n");
|
|
STAT(tunnel_rx_errors);
|
|
return;
|
|
}
|
|
if (t >= MAXTUNNEL)
|
|
{
|
|
LOG(1, s, t, "Received UDP packet with invalid tunnel ID\n");
|
|
STAT(tunnel_rx_errors);
|
|
return;
|
|
}
|
|
if (*buf & 0x08)
|
|
{ // ns/nr
|
|
ns = ntohs(*(uint16_t *) p);
|
|
p += 2;
|
|
nr = ntohs(*(uint16_t *) p);
|
|
p += 2;
|
|
}
|
|
if (*buf & 0x02)
|
|
{ // offset
|
|
uint16_t o = ntohs(*(uint16_t *) p);
|
|
p += o + 2;
|
|
}
|
|
if ((p - buf) > l)
|
|
{
|
|
LOG(1, s, t, "Bad length %d>%d\n", (int) (p - buf), l);
|
|
STAT(tunnel_rx_errors);
|
|
return;
|
|
}
|
|
l -= (p - buf);
|
|
if (*buf & 0x80)
|
|
{ // control
|
|
uint16_t message = 0xFFFF; // message type
|
|
uint8_t fatal = 0;
|
|
uint8_t mandatory = 0;
|
|
uint8_t authtype = 0; // proxy auth type
|
|
uint16_t asession = 0; // assigned session
|
|
uint32_t amagic = 0; // magic number
|
|
uint8_t aflags = 0; // flags from last LCF
|
|
uint16_t version = 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
|
|
char called[MAXTEL] = ""; // called number
|
|
char calling[MAXTEL] = ""; // calling number
|
|
|
|
if (!config->cluster_iam_master)
|
|
{
|
|
master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
|
|
return;
|
|
}
|
|
|
|
// control messages must have bits 0x80|0x40|0x08
|
|
// (type, length and sequence) set, and bits 0x02|0x01
|
|
// (offset and priority) clear
|
|
if ((*buf & 0xCB) != 0xC8)
|
|
{
|
|
LOG(1, s, t, "Bad control header %02X\n", *buf);
|
|
STAT(tunnel_rx_errors);
|
|
return;
|
|
}
|
|
|
|
// check for duplicate tunnel open message
|
|
if (!t && ns == 0)
|
|
{
|
|
int i;
|
|
|
|
//
|
|
// Is this a duplicate of the first packet? (SCCRQ)
|
|
//
|
|
for (i = 1; i <= config->cluster_highest_tunnelid ; ++i)
|
|
{
|
|
if (tunnel[i].state != TUNNELOPENING ||
|
|
tunnel[i].ip != ntohl(*(in_addr_t *) & addr->sin_addr) ||
|
|
tunnel[i].port != ntohs(addr->sin_port) )
|
|
continue;
|
|
t = i;
|
|
LOG(3, s, t, "Duplicate SCCRQ?\n");
|
|
break;
|
|
}
|
|
}
|
|
|
|
LOG(3, s, t, "Control message (%d bytes): (unacked %d) l-ns %d l-nr %d r-ns %d r-nr %d\n",
|
|
l, tunnel[t].controlc, tunnel[t].ns, tunnel[t].nr, ns, nr);
|
|
|
|
// if no tunnel specified, assign one
|
|
if (!t)
|
|
{
|
|
if (!(t = new_tunnel()))
|
|
{
|
|
LOG(1, 0, 0, "No more tunnels\n");
|
|
STAT(tunnel_overflow);
|
|
return;
|
|
}
|
|
tunnelclear(t);
|
|
tunnel[t].ip = ntohl(*(in_addr_t *) & addr->sin_addr);
|
|
tunnel[t].port = ntohs(addr->sin_port);
|
|
tunnel[t].window = 4; // default window
|
|
STAT(tunnel_created);
|
|
LOG(1, 0, t, " New tunnel from %s:%u ID %d\n",
|
|
fmtaddr(htonl(tunnel[t].ip), 0), tunnel[t].port, t);
|
|
}
|
|
|
|
// If the 'ns' just received is not the 'nr' we're
|
|
// expecting, just send an ack and drop it.
|
|
//
|
|
// if 'ns' is less, then we got a retransmitted packet.
|
|
// if 'ns' is greater than missed a packet. Either way
|
|
// we should ignore it.
|
|
if (ns != tunnel[t].nr)
|
|
{
|
|
// is this the sequence we were expecting?
|
|
STAT(tunnel_rx_errors);
|
|
LOG(1, 0, t, " Out of sequence tunnel %d, (%d is not the expected %d)\n",
|
|
t, ns, tunnel[t].nr);
|
|
|
|
if (l) // Is this not a ZLB?
|
|
controlnull(t);
|
|
return;
|
|
}
|
|
|
|
// This is used to time out old tunnels
|
|
tunnel[t].lastrec = time_now;
|
|
|
|
// check sequence of this message
|
|
{
|
|
int skip = tunnel[t].window; // track how many in-window packets are still in queue
|
|
// some to clear maybe?
|
|
while (tunnel[t].controlc > 0 && (((tunnel[t].ns - tunnel[t].controlc) - nr) & 0x8000))
|
|
{
|
|
controlt *c = tunnel[t].controls;
|
|
tunnel[t].controls = c->next;
|
|
tunnel[t].controlc--;
|
|
c->next = controlfree;
|
|
controlfree = c;
|
|
skip--;
|
|
tunnel[t].try = 0; // we have progress
|
|
}
|
|
|
|
// receiver advance (do here so quoted correctly in any sends below)
|
|
if (l) tunnel[t].nr = (ns + 1);
|
|
if (skip < 0) skip = 0;
|
|
if (skip < tunnel[t].controlc)
|
|
{
|
|
// some control packets can now be sent that were previous stuck out of window
|
|
int tosend = tunnel[t].window - skip;
|
|
controlt *c = tunnel[t].controls;
|
|
while (c && skip)
|
|
{
|
|
c = c->next;
|
|
skip--;
|
|
}
|
|
while (c && tosend)
|
|
{
|
|
tunnel[t].try = 0; // first send
|
|
tunnelsend(c->buf, c->length, t);
|
|
c = c->next;
|
|
tosend--;
|
|
}
|
|
}
|
|
if (!tunnel[t].controlc)
|
|
tunnel[t].retry = 0; // caught up
|
|
}
|
|
if (l)
|
|
{ // if not a null message
|
|
int result = 0;
|
|
int error = 0;
|
|
char *msg = 0;
|
|
|
|
// process AVPs
|
|
while (l && !(fatal & 0x80)) // 0x80 = mandatory AVP
|
|
{
|
|
uint16_t n = (ntohs(*(uint16_t *) p) & 0x3FF);
|
|
uint8_t *b = p;
|
|
uint8_t flags = *p;
|
|
uint16_t mtype;
|
|
if (n > l)
|
|
{
|
|
LOG(1, s, t, "Invalid length in AVP\n");
|
|
STAT(tunnel_rx_errors);
|
|
return;
|
|
}
|
|
p += n; // next
|
|
l -= n;
|
|
if (flags & 0x3C) // reserved bits, should be clear
|
|
{
|
|
LOG(1, s, t, "Unrecognised AVP flags %02X\n", *b);
|
|
fatal = flags;
|
|
result = 2; // general error
|
|
error = 3; // reserved field non-zero
|
|
msg = 0;
|
|
continue; // next
|
|
}
|
|
b += 2;
|
|
if (*(uint16_t *) (b))
|
|
{
|
|
LOG(2, s, t, "Unknown AVP vendor %d\n", ntohs(*(uint16_t *) (b)));
|
|
fatal = flags;
|
|
result = 2; // general error
|
|
error = 6; // generic vendor-specific error
|
|
msg = "unsupported vendor-specific";
|
|
continue; // next
|
|
}
|
|
b += 2;
|
|
mtype = ntohs(*(uint16_t *) (b));
|
|
b += 2;
|
|
n -= 6;
|
|
|
|
if (flags & 0x40)
|
|
{
|
|
uint16_t orig_len;
|
|
|
|
// handle hidden AVPs
|
|
if (!*config->l2tpsecret)
|
|
{
|
|
LOG(1, s, t, "Hidden AVP requested, but no L2TP secret.\n");
|
|
fatal = flags;
|
|
result = 2; // general error
|
|
error = 6; // generic vendor-specific error
|
|
msg = "secret not specified";
|
|
continue;
|
|
}
|
|
if (!session[s].random_vector_length)
|
|
{
|
|
LOG(1, s, t, "Hidden AVP requested, but no random vector.\n");
|
|
fatal = flags;
|
|
result = 2; // general error
|
|
error = 6; // generic
|
|
msg = "no random vector";
|
|
continue;
|
|
}
|
|
if (n < 8)
|
|
{
|
|
LOG(2, s, t, "Short hidden AVP.\n");
|
|
fatal = flags;
|
|
result = 2; // general error
|
|
error = 2; // length is wrong
|
|
msg = 0;
|
|
continue;
|
|
}
|
|
|
|
// Unhide the AVP
|
|
unhide_value(b, n, mtype, session[s].random_vector, session[s].random_vector_length);
|
|
|
|
orig_len = ntohs(*(uint16_t *) b);
|
|
if (orig_len > n + 2)
|
|
{
|
|
LOG(1, s, t, "Original length %d too long in hidden AVP of length %d; wrong secret?\n",
|
|
orig_len, n);
|
|
|
|
fatal = flags;
|
|
result = 2; // general error
|
|
error = 2; // length is wrong
|
|
msg = 0;
|
|
continue;
|
|
}
|
|
|
|
b += 2;
|
|
n = orig_len;
|
|
}
|
|
|
|
LOG(4, s, t, " AVP %d (%s) len %d%s%s\n", mtype, l2tp_avp_name(mtype), n,
|
|
flags & 0x40 ? ", hidden" : "", flags & 0x80 ? ", mandatory" : "");
|
|
|
|
switch (mtype)
|
|
{
|
|
case 0: // message type
|
|
message = ntohs(*(uint16_t *) b);
|
|
mandatory = flags & 0x80;
|
|
LOG(4, s, t, " Message type = %d (%s)\n", *b, l2tp_code(message));
|
|
break;
|
|
case 1: // result code
|
|
{
|
|
uint16_t rescode = ntohs(*(uint16_t *) b);
|
|
const char* resdesc = "(unknown)";
|
|
if (message == 4)
|
|
{ /* StopCCN */
|
|
resdesc = l2tp_stopccn_result_code(rescode);
|
|
}
|
|
else if (message == 14)
|
|
{ /* CDN */
|
|
resdesc = l2tp_cdn_result_code(rescode);
|
|
}
|
|
|
|
LOG(4, s, t, " Result Code %d: %s\n", rescode, resdesc);
|
|
if (n >= 4)
|
|
{
|
|
uint16_t errcode = ntohs(*(uint16_t *)(b + 2));
|
|
LOG(4, s, t, " Error Code %d: %s\n", errcode, l2tp_error_code(errcode));
|
|
}
|
|
if (n > 4)
|
|
LOG(4, s, t, " Error String: %.*s\n", n-4, b+4);
|
|
|
|
break;
|
|
}
|
|
break;
|
|
case 2: // protocol version
|
|
{
|
|
version = ntohs(*(uint16_t *) (b));
|
|
LOG(4, s, t, " Protocol version = %d\n", version);
|
|
if (version && version != 0x0100)
|
|
{ // allow 0.0 and 1.0
|
|
LOG(1, s, t, " Bad protocol version %04X\n", version);
|
|
fatal = flags;
|
|
result = 5; // unspported protocol version
|
|
error = 0x0100; // supported version
|
|
msg = 0;
|
|
continue; // next
|
|
}
|
|
}
|
|
break;
|
|
case 3: // framing capabilities
|
|
// LOG(4, s, t, "Framing capabilities\n");
|
|
break;
|
|
case 4: // bearer capabilities
|
|
// LOG(4, s, t, "Bearer capabilities\n");
|
|
break;
|
|
case 5: // tie breaker
|
|
// We never open tunnels, so we don't care about tie breakers
|
|
// LOG(4, s, t, "Tie breaker\n");
|
|
continue;
|
|
case 6: // firmware revision
|
|
// LOG(4, s, t, "Firmware revision\n");
|
|
break;
|
|
case 7: // host name
|
|
memset(tunnel[t].hostname, 0, sizeof(tunnel[t].hostname));
|
|
memcpy(tunnel[t].hostname, b, (n < sizeof(tunnel[t].hostname)) ? n : sizeof(tunnel[t].hostname) - 1);
|
|
LOG(4, s, t, " Tunnel hostname = \"%s\"\n", tunnel[t].hostname);
|
|
// TBA - to send to RADIUS
|
|
break;
|
|
case 8: // vendor name
|
|
memset(tunnel[t].vendor, 0, sizeof(tunnel[t].vendor));
|
|
memcpy(tunnel[t].vendor, b, (n < sizeof(tunnel[t].vendor)) ? n : sizeof(tunnel[t].vendor) - 1);
|
|
LOG(4, s, t, " Vendor name = \"%s\"\n", tunnel[t].vendor);
|
|
break;
|
|
case 9: // assigned tunnel
|
|
tunnel[t].far = ntohs(*(uint16_t *) (b));
|
|
LOG(4, s, t, " Remote tunnel id = %d\n", tunnel[t].far);
|
|
break;
|
|
case 10: // rx window
|
|
tunnel[t].window = ntohs(*(uint16_t *) (b));
|
|
if (!tunnel[t].window)
|
|
tunnel[t].window = 1; // window of 0 is silly
|
|
LOG(4, s, t, " rx window = %d\n", tunnel[t].window);
|
|
break;
|
|
case 11: // Challenge
|
|
{
|
|
LOG(4, s, t, " LAC requested CHAP authentication for tunnel\n");
|
|
build_chap_response(b, 2, n, &chapresponse);
|
|
}
|
|
break;
|
|
case 13: // Response
|
|
// Why did they send a response? We never challenge.
|
|
LOG(2, s, t, " received unexpected challenge response\n");
|
|
break;
|
|
|
|
case 14: // assigned session
|
|
asession = session[s].far = ntohs(*(uint16_t *) (b));
|
|
LOG(4, s, t, " assigned session = %d\n", asession);
|
|
break;
|
|
case 15: // call serial number
|
|
LOG(4, s, t, " call serial number = %d\n", ntohl(*(uint32_t *)b));
|
|
break;
|
|
case 18: // bearer type
|
|
LOG(4, s, t, " bearer type = %d\n", ntohl(*(uint32_t *)b));
|
|
// TBA - for RADIUS
|
|
break;
|
|
case 19: // framing type
|
|
LOG(4, s, t, " framing type = %d\n", ntohl(*(uint32_t *)b));
|
|
// TBA
|
|
break;
|
|
case 21: // called number
|
|
memset(called, 0, sizeof(called));
|
|
memcpy(called, b, (n < sizeof(called)) ? n : sizeof(called) - 1);
|
|
LOG(4, s, t, " Called <%s>\n", called);
|
|
break;
|
|
case 22: // calling number
|
|
memset(calling, 0, sizeof(calling));
|
|
memcpy(calling, b, (n < sizeof(calling)) ? n : sizeof(calling) - 1);
|
|
LOG(4, s, t, " Calling <%s>\n", calling);
|
|
break;
|
|
case 23: // subtype
|
|
break;
|
|
case 24: // tx connect speed
|
|
if (n == 4)
|
|
{
|
|
session[s].tx_connect_speed = ntohl(*(uint32_t *)b);
|
|
}
|
|
else
|
|
{
|
|
// AS5300s send connect speed as a string
|
|
char tmp[30];
|
|
memset(tmp, 0, sizeof(tmp));
|
|
memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
|
|
session[s].tx_connect_speed = atol(tmp);
|
|
}
|
|
LOG(4, s, t, " TX connect speed <%u>\n", session[s].tx_connect_speed);
|
|
break;
|
|
case 38: // rx connect speed
|
|
if (n == 4)
|
|
{
|
|
session[s].rx_connect_speed = ntohl(*(uint32_t *)b);
|
|
}
|
|
else
|
|
{
|
|
// AS5300s send connect speed as a string
|
|
char tmp[30];
|
|
memset(tmp, 0, sizeof(tmp));
|
|
memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
|
|
session[s].rx_connect_speed = atol(tmp);
|
|
}
|
|
LOG(4, s, t, " RX connect speed <%u>\n", session[s].rx_connect_speed);
|
|
break;
|
|
case 25: // Physical Channel ID
|
|
{
|
|
uint32_t tmp = ntohl(*(uint32_t *) b);
|
|
LOG(4, s, t, " Physical Channel ID <%X>\n", tmp);
|
|
break;
|
|
}
|
|
case 29: // Proxy Authentication Type
|
|
{
|
|
uint16_t atype = ntohs(*(uint16_t *)b);
|
|
LOG(4, s, t, " Proxy Auth Type %d (%s)\n", atype, ppp_auth_type(atype));
|
|
if (atype == 2)
|
|
authtype = AUTHCHAP;
|
|
else if (atype == 3)
|
|
authtype = AUTHPAP;
|
|
|
|
break;
|
|
}
|
|
case 30: // Proxy Authentication Name
|
|
{
|
|
char authname[64];
|
|
memset(authname, 0, sizeof(authname));
|
|
memcpy(authname, b, (n < sizeof(authname)) ? n : sizeof(authname) - 1);
|
|
LOG(4, s, t, " Proxy Auth Name (%s)\n",
|
|
authname);
|
|
break;
|
|
}
|
|
case 31: // Proxy Authentication Challenge
|
|
{
|
|
LOG(4, s, t, " Proxy Auth Challenge\n");
|
|
break;
|
|
}
|
|
case 32: // Proxy Authentication ID
|
|
{
|
|
uint16_t authid = ntohs(*(uint16_t *)(b));
|
|
LOG(4, s, t, " Proxy Auth ID (%d)\n", authid);
|
|
break;
|
|
}
|
|
case 33: // Proxy Authentication Response
|
|
LOG(4, s, t, " Proxy Auth Response\n");
|
|
break;
|
|
case 27: // last sent lcp
|
|
{ // find magic number
|
|
uint8_t *p = b, *e = p + n;
|
|
while (p + 1 < e && p[1] && p + p[1] <= e)
|
|
{
|
|
if (*p == 5 && p[1] == 6) // Magic-Number
|
|
amagic = ntohl(*(uint32_t *) (p + 2));
|
|
else if (*p == 3 && p[1] == 4 && *(uint16_t *) (p + 2) == htons(PPPPAP)) // Authentication-Protocol (PAP)
|
|
authtype = AUTHPAP;
|
|
else if (*p == 3 && p[1] == 5 && *(uint16_t *) (p + 2) == htons(PPPCHAP) && p[4] == 5) // Authentication-Protocol (CHAP)
|
|
authtype = AUTHCHAP;
|
|
else if (*p == 7) // Protocol-Field-Compression
|
|
aflags |= SESSIONPFC;
|
|
else if (*p == 8) // Address-and-Control-Field-Compression
|
|
aflags |= SESSIONACFC;
|
|
p += p[1];
|
|
}
|
|
}
|
|
break;
|
|
case 28: // last recv lcp confreq
|
|
break;
|
|
case 26: // Initial Received LCP CONFREQ
|
|
break;
|
|
case 39: // seq required - we control it as an LNS anyway...
|
|
break;
|
|
case 36: // Random Vector
|
|
LOG(4, s, t, " Random Vector received. Enabled AVP Hiding.\n");
|
|
memset(session[s].random_vector, 0, sizeof(session[s].random_vector));
|
|
if (n > sizeof(session[s].random_vector))
|
|
n = sizeof(session[s].random_vector);
|
|
memcpy(session[s].random_vector, b, n);
|
|
session[s].random_vector_length = n;
|
|
break;
|
|
default:
|
|
{
|
|
static char e[] = "unknown AVP 0xXXXX";
|
|
LOG(2, s, t, " Unknown AVP type %d\n", mtype);
|
|
fatal = flags;
|
|
result = 2; // general error
|
|
error = 8; // unknown mandatory AVP
|
|
sprintf((msg = e) + 14, "%04x", mtype);
|
|
continue; // next
|
|
}
|
|
}
|
|
}
|
|
// process message
|
|
if (fatal & 0x80)
|
|
tunnelshutdown(t, "Invalid mandatory AVP", result, error, msg);
|
|
else
|
|
switch (message)
|
|
{
|
|
case 1: // SCCRQ - Start Control Connection Request
|
|
tunnel[t].state = TUNNELOPENING;
|
|
if (main_quit != QUIT_SHUTDOWN)
|
|
{
|
|
controlt *c = controlnew(2); // sending SCCRP
|
|
control16(c, 2, version, 1); // protocol version
|
|
control32(c, 3, 3, 1); // framing
|
|
controls(c, 7, tunnel[t].hostname, 1); // host name (TBA)
|
|
if (chapresponse) controlb(c, 13, chapresponse, 16, 1); // Challenge response
|
|
control16(c, 9, t, 1); // assigned tunnel
|
|
controladd(c, t, 0); // send the resply
|
|
}
|
|
else
|
|
{
|
|
tunnelshutdown(t, "Shutting down", 6, 0, 0);
|
|
}
|
|
break;
|
|
case 2: // SCCRP
|
|
tunnel[t].state = TUNNELOPEN;
|
|
break;
|
|
case 3: // SCCN
|
|
tunnel[t].state = TUNNELOPEN;
|
|
controlnull(t); // ack
|
|
break;
|
|
case 4: // StopCCN
|
|
controlnull(t); // ack
|
|
tunnelshutdown(t, "Stopped", 0, 0, 0); // Shut down cleanly
|
|
break;
|
|
case 6: // HELLO
|
|
controlnull(t); // simply ACK
|
|
break;
|
|
case 7: // OCRQ
|
|
// TBA
|
|
break;
|
|
case 8: // OCRO
|
|
// TBA
|
|
break;
|
|
case 9: // OCCN
|
|
// TBA
|
|
break;
|
|
case 10: // ICRQ
|
|
if (sessionfree && main_quit != QUIT_SHUTDOWN)
|
|
{
|
|
controlt *c = controlnew(11); // ICRP
|
|
|
|
s = sessionfree;
|
|
sessionfree = session[s].next;
|
|
memset(&session[s], 0, sizeof(session[s]));
|
|
|
|
if (s > config->cluster_highest_sessionid)
|
|
config->cluster_highest_sessionid = s;
|
|
|
|
session[s].opened = time_now;
|
|
session[s].tunnel = t;
|
|
session[s].far = asession;
|
|
session[s].last_packet = time_now;
|
|
LOG(3, s, t, "New session (%d/%d)\n", tunnel[t].far, session[s].far);
|
|
control16(c, 14, s, 1); // assigned session
|
|
controladd(c, t, asession); // send the reply
|
|
|
|
strncpy(session[s].called, called, sizeof(session[s].called) - 1);
|
|
strncpy(session[s].calling, calling, sizeof(session[s].calling) - 1);
|
|
|
|
session[s].ppp.phase = Establish;
|
|
session[s].ppp.lcp = Starting;
|
|
|
|
STAT(session_created);
|
|
break;
|
|
}
|
|
|
|
{
|
|
controlt *c = controlnew(14); // CDN
|
|
if (!sessionfree)
|
|
{
|
|
STAT(session_overflow);
|
|
LOG(1, 0, t, "No free sessions\n");
|
|
control16(c, 1, 4, 0); // temporary lack of resources
|
|
}
|
|
else
|
|
control16(c, 1, 2, 7); // shutting down, try another
|
|
|
|
controladd(c, t, asession); // send the message
|
|
}
|
|
return;
|
|
case 11: // ICRP
|
|
// TBA
|
|
break;
|
|
case 12: // ICCN
|
|
if (amagic == 0) amagic = time_now;
|
|
session[s].magic = amagic; // set magic number
|
|
session[s].l2tp_flags = aflags; // set flags received
|
|
LOG(3, s, t, "Magic %X Flags %X\n", amagic, aflags);
|
|
controlnull(t); // ack
|
|
|
|
// proxy authentication type is not supported
|
|
if (!(config->radius_authtypes & authtype))
|
|
authtype = config->radius_authprefer;
|
|
|
|
// start LCP
|
|
sendlcp(t, s, authtype);
|
|
sess_local[s].lcp.restart = time_now + config->ppp_restart_time;
|
|
sess_local[s].lcp.conf_sent = 1;
|
|
sess_local[s].lcp.nak_sent = 0;
|
|
sess_local[s].lcp_authtype = authtype;
|
|
session[s].ppp.lcp = RequestSent;
|
|
|
|
break;
|
|
case 14: // CDN
|
|
controlnull(t); // ack
|
|
sessionshutdown(s, "Closed (Received CDN).", 0, 0);
|
|
break;
|
|
case 0xFFFF:
|
|
LOG(1, s, t, "Missing message type\n");
|
|
break;
|
|
default:
|
|
STAT(tunnel_rx_errors);
|
|
if (mandatory)
|
|
tunnelshutdown(t, "Unknown message type", 2, 6, "unknown message type");
|
|
else
|
|
LOG(1, s, t, "Unknown message type %d\n", message);
|
|
break;
|
|
}
|
|
if (chapresponse) free(chapresponse);
|
|
cluster_send_tunnel(t);
|
|
}
|
|
else
|
|
{
|
|
LOG(4, s, t, " Got a ZLB ack\n");
|
|
}
|
|
}
|
|
else
|
|
{ // data
|
|
uint16_t prot;
|
|
|
|
LOG_HEX(5, "Receive Tunnel Data", p, l);
|
|
if (l > 2 && p[0] == 0xFF && p[1] == 0x03)
|
|
{ // HDLC address header, discard
|
|
p += 2;
|
|
l -= 2;
|
|
}
|
|
if (l < 2)
|
|
{
|
|
LOG(1, s, t, "Short ppp length %d\n", l);
|
|
STAT(tunnel_rx_errors);
|
|
return;
|
|
}
|
|
if (*p & 1)
|
|
{
|
|
prot = *p++;
|
|
l--;
|
|
}
|
|
else
|
|
{
|
|
prot = ntohs(*(uint16_t *) p);
|
|
p += 2;
|
|
l -= 2;
|
|
}
|
|
|
|
if (s && !session[s].opened) // Is something wrong??
|
|
{
|
|
if (!config->cluster_iam_master)
|
|
{
|
|
// Pass it off to the master to deal with..
|
|
master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
|
|
return;
|
|
}
|
|
|
|
|
|
LOG(1, s, t, "UDP packet contains session which is not opened. Dropping packet.\n");
|
|
STAT(tunnel_rx_errors);
|
|
return;
|
|
}
|
|
|
|
if (prot == PPPPAP)
|
|
{
|
|
session[s].last_packet = time_now;
|
|
if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
|
|
processpap(t, s, p, l);
|
|
}
|
|
else if (prot == PPPCHAP)
|
|
{
|
|
session[s].last_packet = time_now;
|
|
if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
|
|
processchap(t, s, p, l);
|
|
}
|
|
else if (prot == PPPLCP)
|
|
{
|
|
session[s].last_packet = time_now;
|
|
if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
|
|
processlcp(t, s, p, l);
|
|
}
|
|
else if (prot == PPPIPCP)
|
|
{
|
|
session[s].last_packet = time_now;
|
|
if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
|
|
processipcp(t, s, p, l);
|
|
}
|
|
else if (prot == PPPIPV6CP)
|
|
{
|
|
session[s].last_packet = time_now;
|
|
if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
|
|
processipv6cp(t, s, p, l);
|
|
}
|
|
else if (prot == PPPCCP)
|
|
{
|
|
session[s].last_packet = time_now;
|
|
if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
|
|
processccp(t, s, p, l);
|
|
}
|
|
else if (prot == PPPIP)
|
|
{
|
|
if (session[s].die)
|
|
{
|
|
LOG(4, s, t, "Session %d is closing. Don't process PPP packets\n", s);
|
|
return; // closing session, PPP not processed
|
|
}
|
|
|
|
session[s].last_packet = time_now;
|
|
if (session[s].walled_garden && !config->cluster_iam_master)
|
|
{
|
|
master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
|
|
return;
|
|
}
|
|
|
|
processipin(t, s, p, l);
|
|
}
|
|
else if (prot == PPPIPV6)
|
|
{
|
|
if (!config->ipv6_prefix.s6_addr[0])
|
|
{
|
|
LOG(1, s, t, "IPv6 not configured; yet received IPv6 packet. Ignoring.\n");
|
|
return;
|
|
}
|
|
if (session[s].die)
|
|
{
|
|
LOG(4, s, t, "Session %d is closing. Don't process PPP packets\n", s);
|
|
return; // closing session, PPP not processed
|
|
}
|
|
|
|
session[s].last_packet = time_now;
|
|
if (session[s].walled_garden && !config->cluster_iam_master)
|
|
{
|
|
master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
|
|
return;
|
|
}
|
|
|
|
processipv6in(t, s, p, l);
|
|
}
|
|
else
|
|
{
|
|
STAT(tunnel_rx_errors);
|
|
LOG(1, s, t, "Unknown PPP protocol %04X\n", prot);
|
|
}
|
|
}
|
|
}
|
|
|
|
// read and process packet on tun
|
|
static void processtun(uint8_t * buf, int len)
|
|
{
|
|
LOG_HEX(5, "Receive TUN Data", buf, len);
|
|
STAT(tun_rx_packets);
|
|
INC_STAT(tun_rx_bytes, len);
|
|
|
|
CSTAT(processtun);
|
|
|
|
eth_rx_pkt++;
|
|
eth_rx += len;
|
|
if (len < 22)
|
|
{
|
|
LOG(1, 0, 0, "Short tun packet %d bytes\n", len);
|
|
STAT(tun_rx_errors);
|
|
return;
|
|
}
|
|
|
|
if (*(uint16_t *) (buf + 2) == htons(PKTIP)) // IPv4
|
|
processipout(buf, len);
|
|
else if (*(uint16_t *) (buf + 2) == htons(PKTIPV6) // IPV6
|
|
&& config->ipv6_prefix.s6_addr[0])
|
|
processipv6out(buf, len);
|
|
|
|
// Else discard.
|
|
}
|
|
|
|
// Handle retries, timeouts. Runs every 1/10th sec, want to ensure
|
|
// that we look at the whole of the tunnel, radius and session tables
|
|
// every second
|
|
static void regular_cleanups(double period)
|
|
{
|
|
// Next tunnel, radius and session to check for actions on.
|
|
static tunnelidt t = 0;
|
|
static int r = 0;
|
|
static sessionidt s = 0;
|
|
|
|
int t_actions = 0;
|
|
int r_actions = 0;
|
|
int s_actions = 0;
|
|
|
|
int t_slice;
|
|
int r_slice;
|
|
int s_slice;
|
|
|
|
int i;
|
|
int a;
|
|
|
|
// divide up tables into slices based on the last run
|
|
t_slice = config->cluster_highest_tunnelid * period;
|
|
r_slice = (MAXRADIUS - 1) * period;
|
|
s_slice = config->cluster_highest_sessionid * period;
|
|
|
|
if (t_slice < 1)
|
|
t_slice = 1;
|
|
else if (t_slice > config->cluster_highest_tunnelid)
|
|
t_slice = config->cluster_highest_tunnelid;
|
|
|
|
if (r_slice < 1)
|
|
r_slice = 1;
|
|
else if (r_slice > (MAXRADIUS - 1))
|
|
r_slice = MAXRADIUS - 1;
|
|
|
|
if (s_slice < 1)
|
|
s_slice = 1;
|
|
else if (s_slice > config->cluster_highest_sessionid)
|
|
s_slice = config->cluster_highest_sessionid;
|
|
|
|
LOG(4, 0, 0, "Begin regular cleanup (last %f seconds ago)\n", period);
|
|
|
|
for (i = 0; i < t_slice; i++)
|
|
{
|
|
t++;
|
|
if (t > config->cluster_highest_tunnelid)
|
|
t = 1;
|
|
|
|
// check for expired tunnels
|
|
if (tunnel[t].die && tunnel[t].die <= TIME)
|
|
{
|
|
STAT(tunnel_timeout);
|
|
tunnelkill(t, "Expired");
|
|
t_actions++;
|
|
continue;
|
|
}
|
|
// check for message resend
|
|
if (tunnel[t].retry && tunnel[t].controlc)
|
|
{
|
|
// resend pending messages as timeout on reply
|
|
if (tunnel[t].retry <= TIME)
|
|
{
|
|
controlt *c = tunnel[t].controls;
|
|
uint8_t w = tunnel[t].window;
|
|
tunnel[t].try++; // another try
|
|
if (tunnel[t].try > 5)
|
|
tunnelkill(t, "Timeout on control message"); // game over
|
|
else
|
|
while (c && w--)
|
|
{
|
|
tunnelsend(c->buf, c->length, t);
|
|
c = c->next;
|
|
}
|
|
|
|
t_actions++;
|
|
}
|
|
}
|
|
// Send hello
|
|
if (tunnel[t].state == TUNNELOPEN && tunnel[t].lastrec < TIME + 600)
|
|
{
|
|
controlt *c = controlnew(6); // sending HELLO
|
|
controladd(c, t, 0); // send the message
|
|
LOG(3, 0, t, "Sending HELLO message\n");
|
|
t_actions++;
|
|
}
|
|
|
|
// Check for tunnel changes requested from the CLI
|
|
if ((a = cli_tunnel_actions[t].action))
|
|
{
|
|
cli_tunnel_actions[t].action = 0;
|
|
if (a & CLI_TUN_KILL)
|
|
{
|
|
LOG(2, 0, t, "Dropping tunnel by CLI\n");
|
|
tunnelshutdown(t, "Requested by administrator", 1, 0, 0);
|
|
t_actions++;
|
|
}
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < r_slice; i++)
|
|
{
|
|
r++;
|
|
if (r >= MAXRADIUS)
|
|
r = 1;
|
|
|
|
if (!radius[r].state)
|
|
continue;
|
|
|
|
if (radius[r].retry <= TIME)
|
|
{
|
|
radiusretry(r);
|
|
r_actions++;
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < s_slice; i++)
|
|
{
|
|
s++;
|
|
if (s > config->cluster_highest_sessionid)
|
|
s = 1;
|
|
|
|
if (!session[s].opened) // Session isn't in use
|
|
continue;
|
|
|
|
// check for expired sessions
|
|
if (session[s].die)
|
|
{
|
|
if (session[s].die <= TIME)
|
|
{
|
|
sessionkill(s, "Expired");
|
|
s_actions++;
|
|
}
|
|
continue;
|
|
}
|
|
|
|
// PPP timeouts
|
|
if (sess_local[s].lcp.restart >= time_now)
|
|
{
|
|
int next_state = session[s].ppp.lcp;
|
|
switch (session[s].ppp.lcp)
|
|
{
|
|
case RequestSent:
|
|
case AckReceived:
|
|
next_state = RequestSent;
|
|
|
|
case AckSent:
|
|
if (sess_local[s].lcp.conf_sent < config->ppp_max_configure)
|
|
{
|
|
LOG(3, s, session[s].tunnel, "No ACK for LCP ConfigReq... resending\n");
|
|
sess_local[s].lcp.restart = time_now + config->ppp_restart_time;
|
|
sess_local[s].lcp.conf_sent++;
|
|
sendlcp(t, s, sess_local[s].lcp_authtype);
|
|
change_state(s, lcp, next_state);
|
|
}
|
|
else
|
|
{
|
|
sessionshutdown(s, "No response to LCP ConfigReq.", 3, 0);
|
|
STAT(session_timeout);
|
|
}
|
|
|
|
s_actions++;
|
|
}
|
|
|
|
if (session[s].die)
|
|
continue;
|
|
}
|
|
|
|
if (sess_local[s].ipcp.restart >= time_now)
|
|
{
|
|
int next_state = session[s].ppp.ipcp;
|
|
switch (session[s].ppp.ipcp)
|
|
{
|
|
case RequestSent:
|
|
case AckReceived:
|
|
next_state = RequestSent;
|
|
|
|
case AckSent:
|
|
if (sess_local[s].ipcp.conf_sent < config->ppp_max_configure)
|
|
{
|
|
LOG(3, s, session[s].tunnel, "No ACK for IPCP ConfigReq... resending\n");
|
|
sess_local[s].ipcp.restart = time_now + config->ppp_restart_time;
|
|
sess_local[s].ipcp.conf_sent++;
|
|
sendipcp(t, s);
|
|
change_state(s, ipcp, next_state);
|
|
}
|
|
else
|
|
{
|
|
sessionshutdown(s, "No response to IPCP ConfigReq.", 3, 0);
|
|
STAT(session_timeout);
|
|
}
|
|
|
|
s_actions++;
|
|
}
|
|
|
|
if (session[s].die)
|
|
continue;
|
|
}
|
|
|
|
if (sess_local[s].ipv6cp.restart >= time_now)
|
|
{
|
|
int next_state = session[s].ppp.ipv6cp;
|
|
switch (session[s].ppp.ipv6cp)
|
|
{
|
|
case RequestSent:
|
|
case AckReceived:
|
|
next_state = RequestSent;
|
|
|
|
case AckSent:
|
|
if (sess_local[s].ipv6cp.conf_sent < config->ppp_max_configure)
|
|
{
|
|
LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq... resending\n");
|
|
sess_local[s].ipv6cp.restart = time_now + config->ppp_restart_time;
|
|
sess_local[s].ipv6cp.conf_sent++;
|
|
sendipv6cp(t, s);
|
|
change_state(s, ipv6cp, next_state);
|
|
}
|
|
else
|
|
{
|
|
LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq\n");
|
|
change_state(s, ipv6cp, Stopped);
|
|
}
|
|
|
|
s_actions++;
|
|
}
|
|
}
|
|
|
|
if (sess_local[s].ccp.restart >= time_now)
|
|
{
|
|
int next_state = session[s].ppp.ccp;
|
|
switch (session[s].ppp.ccp)
|
|
{
|
|
case RequestSent:
|
|
case AckReceived:
|
|
next_state = RequestSent;
|
|
|
|
case AckSent:
|
|
if (sess_local[s].ccp.conf_sent < config->ppp_max_configure)
|
|
{
|
|
LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq... resending\n");
|
|
sess_local[s].ccp.restart = time_now + config->ppp_restart_time;
|
|
sess_local[s].ccp.conf_sent++;
|
|
sendccp(t, s);
|
|
change_state(s, ccp, next_state);
|
|
}
|
|
else
|
|
{
|
|
LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq\n");
|
|
change_state(s, ccp, Stopped);
|
|
}
|
|
|
|
s_actions++;
|
|
}
|
|
}
|
|
|
|
// Drop sessions who have not responded within IDLE_TIMEOUT seconds
|
|
if (session[s].last_packet && (time_now - session[s].last_packet >= IDLE_TIMEOUT))
|
|
{
|
|
sessionshutdown(s, "No response to LCP ECHO requests.", 3, 0);
|
|
STAT(session_timeout);
|
|
s_actions++;
|
|
continue;
|
|
}
|
|
|
|
// No data in ECHO_TIMEOUT seconds, send LCP ECHO
|
|
if (session[s].ppp.phase >= Establish && (time_now - session[s].last_packet >= ECHO_TIMEOUT))
|
|
{
|
|
uint8_t b[MAXCONTROL] = {0};
|
|
|
|
uint8_t *q = makeppp(b, sizeof(b), 0, 0, session[s].tunnel, s, PPPLCP);
|
|
if (!q) continue;
|
|
|
|
*q = EchoReq;
|
|
*(uint8_t *)(q + 1) = (time_now % 255); // ID
|
|
*(uint16_t *)(q + 2) = htons(8); // Length
|
|
*(uint32_t *)(q + 4) = 0; // Magic Number (not supported)
|
|
|
|
LOG(4, s, session[s].tunnel, "No data in %d seconds, sending LCP ECHO\n",
|
|
(int)(time_now - session[s].last_packet));
|
|
tunnelsend(b, 24, session[s].tunnel); // send it
|
|
s_actions++;
|
|
}
|
|
|
|
// Check for actions requested from the CLI
|
|
if ((a = cli_session_actions[s].action))
|
|
{
|
|
int send = 0;
|
|
|
|
cli_session_actions[s].action = 0;
|
|
if (a & CLI_SESS_KILL)
|
|
{
|
|
LOG(2, s, session[s].tunnel, "Dropping session by CLI\n");
|
|
sessionshutdown(s, "Requested by administrator.", 3, 0);
|
|
a = 0; // dead, no need to check for other actions
|
|
s_actions++;
|
|
}
|
|
|
|
if (a & CLI_SESS_NOSNOOP)
|
|
{
|
|
LOG(2, s, session[s].tunnel, "Unsnooping session by CLI\n");
|
|
session[s].snoop_ip = 0;
|
|
session[s].snoop_port = 0;
|
|
s_actions++;
|
|
send++;
|
|
}
|
|
else if (a & CLI_SESS_SNOOP)
|
|
{
|
|
LOG(2, s, session[s].tunnel, "Snooping session by CLI (to %s:%d)\n",
|
|
fmtaddr(cli_session_actions[s].snoop_ip, 0),
|
|
cli_session_actions[s].snoop_port);
|
|
|
|
session[s].snoop_ip = cli_session_actions[s].snoop_ip;
|
|
session[s].snoop_port = cli_session_actions[s].snoop_port;
|
|
s_actions++;
|
|
send++;
|
|
}
|
|
|
|
if (a & CLI_SESS_NOTHROTTLE)
|
|
{
|
|
LOG(2, s, session[s].tunnel, "Un-throttling session by CLI\n");
|
|
throttle_session(s, 0, 0);
|
|
s_actions++;
|
|
send++;
|
|
}
|
|
else if (a & CLI_SESS_THROTTLE)
|
|
{
|
|
LOG(2, s, session[s].tunnel, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
|
|
cli_session_actions[s].throttle_in,
|
|
cli_session_actions[s].throttle_out);
|
|
|
|
throttle_session(s, cli_session_actions[s].throttle_in, cli_session_actions[s].throttle_out);
|
|
s_actions++;
|
|
send++;
|
|
}
|
|
|
|
if (a & CLI_SESS_NOFILTER)
|
|
{
|
|
LOG(2, s, session[s].tunnel, "Un-filtering session by CLI\n");
|
|
filter_session(s, 0, 0);
|
|
s_actions++;
|
|
send++;
|
|
}
|
|
else if (a & CLI_SESS_FILTER)
|
|
{
|
|
LOG(2, s, session[s].tunnel, "Filtering session by CLI (in=%d, out=%d)\n",
|
|
cli_session_actions[s].filter_in,
|
|
cli_session_actions[s].filter_out);
|
|
|
|
filter_session(s, cli_session_actions[s].filter_in, cli_session_actions[s].filter_out);
|
|
s_actions++;
|
|
send++;
|
|
}
|
|
|
|
if (send)
|
|
cluster_send_session(s);
|
|
}
|
|
|
|
// RADIUS interim accounting
|
|
if (config->radius_accounting && config->radius_interim > 0
|
|
&& session[s].ip && !session[s].walled_garden
|
|
&& !sess_local[s].radius // RADIUS already in progress
|
|
&& time_now - sess_local[s].last_interim >= config->radius_interim)
|
|
{
|
|
int rad = radiusnew(s);
|
|
if (!rad)
|
|
{
|
|
LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Interim message\n");
|
|
STAT(radius_overflow);
|
|
continue;
|
|
}
|
|
|
|
LOG(3, s, session[s].tunnel, "Sending RADIUS Interim for %s (%u)\n",
|
|
session[s].user, session[s].unique_id);
|
|
|
|
radiussend(rad, RADIUSINTERIM);
|
|
sess_local[s].last_interim = time_now;
|
|
s_actions++;
|
|
}
|
|
}
|
|
|
|
LOG(4, 0, 0, "End regular cleanup: checked %d/%d/%d tunnels/radius/sessions; %d/%d/%d actions\n",
|
|
t_slice, r_slice, s_slice, t_actions, r_actions, s_actions);
|
|
}
|
|
|
|
//
|
|
// Are we in the middle of a tunnel update, or radius
|
|
// requests??
|
|
//
|
|
static int still_busy(void)
|
|
{
|
|
int i;
|
|
static clockt last_talked = 0;
|
|
static clockt start_busy_wait = 0;
|
|
|
|
if (!config->cluster_iam_master)
|
|
{
|
|
#ifdef BGP
|
|
static time_t stopped_bgp = 0;
|
|
if (bgp_configured)
|
|
{
|
|
if (!stopped_bgp)
|
|
{
|
|
LOG(1, 0, 0, "Shutting down in %d seconds, stopping BGP...\n", QUIT_DELAY);
|
|
|
|
for (i = 0; i < BGP_NUM_PEERS; i++)
|
|
if (bgp_peers[i].state == Established)
|
|
bgp_stop(&bgp_peers[i]);
|
|
|
|
stopped_bgp = time_now;
|
|
|
|
// we don't want to become master
|
|
cluster_send_ping(0);
|
|
|
|
return 1;
|
|
}
|
|
|
|
if (time_now < (stopped_bgp + QUIT_DELAY))
|
|
return 1;
|
|
}
|
|
#endif /* BGP */
|
|
|
|
return 0;
|
|
}
|
|
|
|
if (main_quit == QUIT_SHUTDOWN)
|
|
{
|
|
static int dropped = 0;
|
|
if (!dropped)
|
|
{
|
|
int i;
|
|
|
|
LOG(1, 0, 0, "Dropping sessions and tunnels\n");
|
|
for (i = 1; i < MAXTUNNEL; i++)
|
|
if (tunnel[i].ip || tunnel[i].state)
|
|
tunnelshutdown(i, "L2TPNS Closing", 6, 0, 0);
|
|
|
|
dropped = 1;
|
|
}
|
|
}
|
|
|
|
if (start_busy_wait == 0)
|
|
start_busy_wait = TIME;
|
|
|
|
for (i = config->cluster_highest_tunnelid ; i > 0 ; --i)
|
|
{
|
|
if (!tunnel[i].controlc)
|
|
continue;
|
|
|
|
if (last_talked != TIME)
|
|
{
|
|
LOG(2, 0, 0, "Tunnel %d still has un-acked control messages.\n", i);
|
|
last_talked = TIME;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
// We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
|
|
if (abs(TIME - start_busy_wait) > BUSY_WAIT_TIME)
|
|
{
|
|
LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
|
|
return 0;
|
|
}
|
|
|
|
for (i = 1; i < MAXRADIUS; i++)
|
|
{
|
|
if (radius[i].state == RADIUSNULL)
|
|
continue;
|
|
if (radius[i].state == RADIUSWAIT)
|
|
continue;
|
|
|
|
if (last_talked != TIME)
|
|
{
|
|
LOG(2, 0, 0, "Radius session %d is still busy (sid %d)\n", i, radius[i].session);
|
|
last_talked = TIME;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef HAVE_EPOLL
|
|
# include <sys/epoll.h>
|
|
#else
|
|
# define FAKE_EPOLL_IMPLEMENTATION /* include the functions */
|
|
# include "fake_epoll.h"
|
|
#endif
|
|
|
|
// the base set of fds polled: cli, cluster, tun, udp, control, dae
|
|
#define BASE_FDS 6
|
|
|
|
// additional polled fds
|
|
#ifdef BGP
|
|
# define EXTRA_FDS BGP_NUM_PEERS
|
|
#else
|
|
# define EXTRA_FDS 0
|
|
#endif
|
|
|
|
// main loop - gets packets on tun or udp and processes them
|
|
static void mainloop(void)
|
|
{
|
|
int i;
|
|
uint8_t buf[65536];
|
|
clockt next_cluster_ping = 0; // send initial ping immediately
|
|
struct epoll_event events[BASE_FDS + RADIUS_FDS + EXTRA_FDS];
|
|
int maxevent = sizeof(events)/sizeof(*events);
|
|
|
|
if ((epollfd = epoll_create(maxevent)) < 0)
|
|
{
|
|
LOG(0, 0, 0, "epoll_create failed: %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
|
|
LOG(4, 0, 0, "Beginning of main loop. clifd=%d, cluster_sockfd=%d, tunfd=%d, udpfd=%d, controlfd=%d, daefd=%d\n",
|
|
clifd, cluster_sockfd, tunfd, udpfd, controlfd, daefd);
|
|
|
|
/* setup our fds to poll for input */
|
|
{
|
|
static struct event_data d[BASE_FDS];
|
|
struct epoll_event e;
|
|
|
|
e.events = EPOLLIN;
|
|
i = 0;
|
|
|
|
d[i].type = FD_TYPE_CLI;
|
|
e.data.ptr = &d[i++];
|
|
epoll_ctl(epollfd, EPOLL_CTL_ADD, clifd, &e);
|
|
|
|
d[i].type = FD_TYPE_CLUSTER;
|
|
e.data.ptr = &d[i++];
|
|
epoll_ctl(epollfd, EPOLL_CTL_ADD, cluster_sockfd, &e);
|
|
|
|
d[i].type = FD_TYPE_TUN;
|
|
e.data.ptr = &d[i++];
|
|
epoll_ctl(epollfd, EPOLL_CTL_ADD, tunfd, &e);
|
|
|
|
d[i].type = FD_TYPE_UDP;
|
|
e.data.ptr = &d[i++];
|
|
epoll_ctl(epollfd, EPOLL_CTL_ADD, udpfd, &e);
|
|
|
|
d[i].type = FD_TYPE_CONTROL;
|
|
e.data.ptr = &d[i++];
|
|
epoll_ctl(epollfd, EPOLL_CTL_ADD, controlfd, &e);
|
|
|
|
d[i].type = FD_TYPE_DAE;
|
|
e.data.ptr = &d[i++];
|
|
epoll_ctl(epollfd, EPOLL_CTL_ADD, daefd, &e);
|
|
}
|
|
|
|
#ifdef BGP
|
|
signal(SIGPIPE, SIG_IGN);
|
|
bgp_setup(config->as_number);
|
|
if (config->bind_address)
|
|
bgp_add_route(config->bind_address, 0xffffffff);
|
|
|
|
for (i = 0; i < BGP_NUM_PEERS; i++)
|
|
{
|
|
if (config->neighbour[i].name[0])
|
|
bgp_start(&bgp_peers[i], config->neighbour[i].name,
|
|
config->neighbour[i].as, config->neighbour[i].keepalive,
|
|
config->neighbour[i].hold, 0); /* 0 = routing disabled */
|
|
}
|
|
#endif /* BGP */
|
|
|
|
while (!main_quit || still_busy())
|
|
{
|
|
int more = 0;
|
|
int n;
|
|
|
|
if (config->reload_config)
|
|
{
|
|
// Update the config state based on config settings
|
|
update_config();
|
|
}
|
|
|
|
#ifdef BGP
|
|
bgp_set_poll();
|
|
#endif /* BGP */
|
|
|
|
n = epoll_wait(epollfd, events, maxevent, 100); // timeout 100ms (1/10th sec)
|
|
STAT(select_called);
|
|
|
|
TIME = now(NULL);
|
|
if (n < 0)
|
|
{
|
|
if (errno == EINTR ||
|
|
errno == ECHILD) // EINTR was clobbered by sigchild_handler()
|
|
continue;
|
|
|
|
LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno));
|
|
break; // exit
|
|
}
|
|
|
|
if (n)
|
|
{
|
|
struct sockaddr_in addr;
|
|
socklen_t alen;
|
|
int c, s;
|
|
int udp_ready = 0;
|
|
int tun_ready = 0;
|
|
int cluster_ready = 0;
|
|
int udp_pkts = 0;
|
|
int tun_pkts = 0;
|
|
int cluster_pkts = 0;
|
|
#ifdef BGP
|
|
uint32_t bgp_events[BGP_NUM_PEERS];
|
|
memset(bgp_events, 0, sizeof(bgp_events));
|
|
#endif /* BGP */
|
|
|
|
for (c = n, i = 0; i < c; i++)
|
|
{
|
|
struct event_data *d = events[i].data.ptr;
|
|
switch (d->type)
|
|
{
|
|
case FD_TYPE_CLI: // CLI connections
|
|
{
|
|
int cli;
|
|
|
|
alen = sizeof(addr);
|
|
if ((cli = accept(clifd, (struct sockaddr *)&addr, &alen)) >= 0)
|
|
{
|
|
cli_do(cli);
|
|
close(cli);
|
|
}
|
|
else
|
|
LOG(0, 0, 0, "accept error: %s\n", strerror(errno));
|
|
|
|
n--;
|
|
break;
|
|
}
|
|
|
|
// these are handled below, with multiple interleaved reads
|
|
case FD_TYPE_CLUSTER: cluster_ready++; break;
|
|
case FD_TYPE_TUN: tun_ready++; break;
|
|
case FD_TYPE_UDP: udp_ready++; break;
|
|
|
|
case FD_TYPE_CONTROL: // nsctl commands
|
|
alen = sizeof(addr);
|
|
processcontrol(buf, recvfrom(controlfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen), &addr, alen);
|
|
n--;
|
|
break;
|
|
|
|
case FD_TYPE_DAE: // DAE requests
|
|
alen = sizeof(addr);
|
|
processdae(buf, recvfrom(daefd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen), &addr, alen);
|
|
n--;
|
|
break;
|
|
|
|
case FD_TYPE_RADIUS: // RADIUS response
|
|
s = recv(radfds[d->index], buf, sizeof(buf), 0);
|
|
if (s >= 0 && config->cluster_iam_master)
|
|
processrad(buf, s, d->index);
|
|
|
|
n--;
|
|
break;
|
|
|
|
#ifdef BGP
|
|
case FD_TYPE_BGP:
|
|
bgp_events[d->index] = events[i].events;
|
|
n--;
|
|
break;
|
|
#endif /* BGP */
|
|
|
|
default:
|
|
LOG(0, 0, 0, "Unexpected fd type returned from epoll_wait: %d\n", d->type);
|
|
}
|
|
}
|
|
|
|
#ifdef BGP
|
|
bgp_process(bgp_events);
|
|
#endif /* BGP */
|
|
|
|
for (c = 0; n && c < config->multi_read_count; c++)
|
|
{
|
|
// L2TP
|
|
if (udp_ready)
|
|
{
|
|
alen = sizeof(addr);
|
|
if ((s = recvfrom(udpfd, buf, sizeof(buf), 0, (void *) &addr, &alen)) > 0)
|
|
{
|
|
processudp(buf, s, &addr);
|
|
udp_pkts++;
|
|
}
|
|
else
|
|
{
|
|
udp_ready = 0;
|
|
n--;
|
|
}
|
|
}
|
|
|
|
// incoming IP
|
|
if (tun_ready)
|
|
{
|
|
if ((s = read(tunfd, buf, sizeof(buf))) > 0)
|
|
{
|
|
processtun(buf, s);
|
|
tun_pkts++;
|
|
}
|
|
else
|
|
{
|
|
tun_ready = 0;
|
|
n--;
|
|
}
|
|
}
|
|
|
|
// cluster
|
|
if (cluster_ready)
|
|
{
|
|
alen = sizeof(addr);
|
|
if ((s = recvfrom(cluster_sockfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen)) > 0)
|
|
{
|
|
processcluster(buf, s, addr.sin_addr.s_addr);
|
|
cluster_pkts++;
|
|
}
|
|
else
|
|
{
|
|
cluster_ready = 0;
|
|
n--;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (udp_pkts > 1 || tun_pkts > 1 || cluster_pkts > 1)
|
|
STAT(multi_read_used);
|
|
|
|
if (c >= config->multi_read_count)
|
|
{
|
|
LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun and %d cluster packets\n",
|
|
config->multi_read_count, udp_pkts, tun_pkts, cluster_pkts);
|
|
|
|
STAT(multi_read_exceeded);
|
|
more++;
|
|
}
|
|
}
|
|
|
|
// Runs on every machine (master and slaves).
|
|
if (next_cluster_ping <= TIME)
|
|
{
|
|
// Check to see which of the cluster is still alive..
|
|
|
|
cluster_send_ping(basetime); // Only does anything if we're a slave
|
|
cluster_check_master(); // ditto.
|
|
|
|
cluster_heartbeat(); // Only does anything if we're a master.
|
|
cluster_check_slaves(); // ditto.
|
|
|
|
master_update_counts(); // If we're a slave, send our byte counters to our master.
|
|
|
|
if (config->cluster_iam_master && !config->cluster_iam_uptodate)
|
|
next_cluster_ping = TIME + 1; // out-of-date slaves, do fast updates
|
|
else
|
|
next_cluster_ping = TIME + config->cluster_hb_interval;
|
|
}
|
|
|
|
if (!config->cluster_iam_master)
|
|
continue;
|
|
|
|
// Run token bucket filtering queue..
|
|
// Only run it every 1/10th of a second.
|
|
{
|
|
static clockt last_run = 0;
|
|
if (last_run != TIME)
|
|
{
|
|
last_run = TIME;
|
|
tbf_run_timer();
|
|
}
|
|
}
|
|
|
|
// Handle timeouts, retries etc.
|
|
{
|
|
static double last_clean = 0;
|
|
double this_clean;
|
|
double diff;
|
|
|
|
TIME = now(&this_clean);
|
|
diff = this_clean - last_clean;
|
|
|
|
// Run during idle time (after we've handled
|
|
// all incoming packets) or every 1/10th sec
|
|
if (!more || diff > 0.1)
|
|
{
|
|
regular_cleanups(diff);
|
|
last_clean = this_clean;
|
|
}
|
|
}
|
|
|
|
if (*config->accounting_dir)
|
|
{
|
|
static clockt next_acct = 0;
|
|
static clockt next_shut_acct = 0;
|
|
|
|
if (next_acct <= TIME)
|
|
{
|
|
// Dump accounting data
|
|
next_acct = TIME + ACCT_TIME;
|
|
next_shut_acct = TIME + ACCT_SHUT_TIME;
|
|
dump_acct_info(1);
|
|
}
|
|
else if (next_shut_acct <= TIME)
|
|
{
|
|
// Dump accounting data for shutdown sessions
|
|
next_shut_acct = TIME + ACCT_SHUT_TIME;
|
|
if (shut_acct_n)
|
|
dump_acct_info(0);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Are we the master and shutting down??
|
|
if (config->cluster_iam_master)
|
|
cluster_heartbeat(); // Flush any queued changes..
|
|
|
|
// Ok. Notify everyone we're shutting down. If we're
|
|
// the master, this will force an election.
|
|
cluster_send_ping(0);
|
|
|
|
//
|
|
// Important!!! We MUST not process any packets past this point!
|
|
LOG(1, 0, 0, "Shutdown complete\n");
|
|
}
|
|
|
|
static void stripdomain(char *host)
|
|
{
|
|
char *p;
|
|
|
|
if ((p = strchr(host, '.')))
|
|
{
|
|
char *domain = 0;
|
|
char _domain[1024];
|
|
|
|
// strip off domain
|
|
FILE *resolv = fopen("/etc/resolv.conf", "r");
|
|
if (resolv)
|
|
{
|
|
char buf[1024];
|
|
char *b;
|
|
|
|
while (fgets(buf, sizeof(buf), resolv))
|
|
{
|
|
if (strncmp(buf, "domain", 6) && strncmp(buf, "search", 6))
|
|
continue;
|
|
|
|
if (!isspace(buf[6]))
|
|
continue;
|
|
|
|
b = buf + 7;
|
|
while (isspace(*b)) b++;
|
|
|
|
if (*b)
|
|
{
|
|
char *d = b;
|
|
while (*b && !isspace(*b)) b++;
|
|
*b = 0;
|
|
if (buf[0] == 'd') // domain is canonical
|
|
{
|
|
domain = d;
|
|
break;
|
|
}
|
|
|
|
// first search line
|
|
if (!domain)
|
|
{
|
|
// hold, may be subsequent domain line
|
|
strncpy(_domain, d, sizeof(_domain))[sizeof(_domain)-1] = 0;
|
|
domain = _domain;
|
|
}
|
|
}
|
|
}
|
|
|
|
fclose(resolv);
|
|
}
|
|
|
|
if (domain)
|
|
{
|
|
int hl = strlen(host);
|
|
int dl = strlen(domain);
|
|
if (dl < hl && host[hl - dl - 1] == '.' && !strcmp(host + hl - dl, domain))
|
|
host[hl -dl - 1] = 0;
|
|
}
|
|
else
|
|
{
|
|
*p = 0; // everything after first dot
|
|
}
|
|
}
|
|
}
|
|
|
|
// Init data structures
|
|
static void initdata(int optdebug, char *optconfig)
|
|
{
|
|
int i;
|
|
|
|
if (!(config = shared_malloc(sizeof(configt))))
|
|
{
|
|
fprintf(stderr, "Error doing malloc for configuration: %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
|
|
memset(config, 0, sizeof(configt));
|
|
time(&config->start_time);
|
|
strncpy(config->config_file, optconfig, strlen(optconfig));
|
|
config->debug = optdebug;
|
|
config->num_tbfs = MAXTBFS;
|
|
config->rl_rate = 28; // 28kbps
|
|
config->cluster_master_min_adv = 1;
|
|
config->ppp_restart_time = 3;
|
|
config->ppp_max_configure = 10;
|
|
config->ppp_max_failure = 5;
|
|
strcpy(config->random_device, RANDOMDEVICE);
|
|
|
|
log_stream = stderr;
|
|
|
|
#ifdef RINGBUFFER
|
|
if (!(ringbuffer = shared_malloc(sizeof(struct Tringbuffer))))
|
|
{
|
|
LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
memset(ringbuffer, 0, sizeof(struct Tringbuffer));
|
|
#endif
|
|
|
|
if (!(_statistics = shared_malloc(sizeof(struct Tstats))))
|
|
{
|
|
LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
if (!(tunnel = shared_malloc(sizeof(tunnelt) * MAXTUNNEL)))
|
|
{
|
|
LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
if (!(session = shared_malloc(sizeof(sessiont) * MAXSESSION)))
|
|
{
|
|
LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
|
|
if (!(sess_local = shared_malloc(sizeof(sessionlocalt) * MAXSESSION)))
|
|
{
|
|
LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
|
|
if (!(radius = shared_malloc(sizeof(radiust) * MAXRADIUS)))
|
|
{
|
|
LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
|
|
if (!(ip_address_pool = shared_malloc(sizeof(ippoolt) * MAXIPPOOL)))
|
|
{
|
|
LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
|
|
if (!(ip_filters = shared_malloc(sizeof(ip_filtert) * MAXFILTER)))
|
|
{
|
|
LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
memset(ip_filters, 0, sizeof(ip_filtert) * MAXFILTER);
|
|
|
|
if (!(cli_session_actions = shared_malloc(sizeof(struct cli_session_actions) * MAXSESSION)))
|
|
{
|
|
LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
memset(cli_session_actions, 0, sizeof(struct cli_session_actions) * MAXSESSION);
|
|
|
|
if (!(cli_tunnel_actions = shared_malloc(sizeof(struct cli_tunnel_actions) * MAXSESSION)))
|
|
{
|
|
LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
memset(cli_tunnel_actions, 0, sizeof(struct cli_tunnel_actions) * MAXSESSION);
|
|
|
|
memset(tunnel, 0, sizeof(tunnelt) * MAXTUNNEL);
|
|
memset(session, 0, sizeof(sessiont) * MAXSESSION);
|
|
memset(radius, 0, sizeof(radiust) * MAXRADIUS);
|
|
memset(ip_address_pool, 0, sizeof(ippoolt) * MAXIPPOOL);
|
|
|
|
// Put all the sessions on the free list marked as undefined.
|
|
for (i = 1; i < MAXSESSION; i++)
|
|
{
|
|
session[i].next = i + 1;
|
|
session[i].tunnel = T_UNDEF; // mark it as not filled in.
|
|
}
|
|
session[MAXSESSION - 1].next = 0;
|
|
sessionfree = 1;
|
|
|
|
// Mark all the tunnels as undefined (waiting to be filled in by a download).
|
|
for (i = 1; i < MAXTUNNEL; i++)
|
|
tunnel[i].state = TUNNELUNDEF; // mark it as not filled in.
|
|
|
|
if (!*hostname)
|
|
{
|
|
// Grab my hostname unless it's been specified
|
|
gethostname(hostname, sizeof(hostname));
|
|
stripdomain(hostname);
|
|
}
|
|
|
|
_statistics->start_time = _statistics->last_reset = time(NULL);
|
|
|
|
#ifdef BGP
|
|
if (!(bgp_peers = shared_malloc(sizeof(struct bgp_peer) * BGP_NUM_PEERS)))
|
|
{
|
|
LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
#endif /* BGP */
|
|
}
|
|
|
|
static int assign_ip_address(sessionidt s)
|
|
{
|
|
uint32_t i;
|
|
int best = -1;
|
|
time_t best_time = time_now;
|
|
char *u = session[s].user;
|
|
char reuse = 0;
|
|
|
|
|
|
CSTAT(assign_ip_address);
|
|
|
|
for (i = 1; i < ip_pool_size; i++)
|
|
{
|
|
if (!ip_address_pool[i].address || ip_address_pool[i].assigned)
|
|
continue;
|
|
|
|
if (!session[s].walled_garden && ip_address_pool[i].user[0] && !strcmp(u, ip_address_pool[i].user))
|
|
{
|
|
best = i;
|
|
reuse = 1;
|
|
break;
|
|
}
|
|
|
|
if (ip_address_pool[i].last < best_time)
|
|
{
|
|
best = i;
|
|
if (!(best_time = ip_address_pool[i].last))
|
|
break; // never used, grab this one
|
|
}
|
|
}
|
|
|
|
if (best < 0)
|
|
{
|
|
LOG(0, s, session[s].tunnel, "assign_ip_address(): out of addresses\n");
|
|
return 0;
|
|
}
|
|
|
|
session[s].ip = ip_address_pool[best].address;
|
|
session[s].ip_pool_index = best;
|
|
ip_address_pool[best].assigned = 1;
|
|
ip_address_pool[best].last = time_now;
|
|
ip_address_pool[best].session = s;
|
|
if (session[s].walled_garden)
|
|
/* Don't track addresses of users in walled garden (note: this
|
|
means that their address isn't "sticky" even if they get
|
|
un-gardened). */
|
|
ip_address_pool[best].user[0] = 0;
|
|
else
|
|
strncpy(ip_address_pool[best].user, u, sizeof(ip_address_pool[best].user) - 1);
|
|
|
|
STAT(ip_allocated);
|
|
LOG(4, s, session[s].tunnel, "assign_ip_address(): %s ip address %d from pool\n",
|
|
reuse ? "Reusing" : "Allocating", best);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static void free_ip_address(sessionidt s)
|
|
{
|
|
int i = session[s].ip_pool_index;
|
|
|
|
|
|
CSTAT(free_ip_address);
|
|
|
|
if (!session[s].ip)
|
|
return; // what the?
|
|
|
|
if (i < 0) // Is this actually part of the ip pool?
|
|
i = 0;
|
|
|
|
STAT(ip_freed);
|
|
cache_ipmap(session[s].ip, -i); // Change the mapping to point back to the ip pool index.
|
|
session[s].ip = 0;
|
|
ip_address_pool[i].assigned = 0;
|
|
ip_address_pool[i].session = 0;
|
|
ip_address_pool[i].last = time_now;
|
|
}
|
|
|
|
//
|
|
// Fsck the address pool against the session table.
|
|
// Normally only called when we become a master.
|
|
//
|
|
// This isn't perfect: We aren't keep tracking of which
|
|
// users used to have an IP address.
|
|
//
|
|
void rebuild_address_pool(void)
|
|
{
|
|
int i;
|
|
|
|
//
|
|
// Zero the IP pool allocation, and build
|
|
// a map from IP address to pool index.
|
|
for (i = 1; i < MAXIPPOOL; ++i)
|
|
{
|
|
ip_address_pool[i].assigned = 0;
|
|
ip_address_pool[i].session = 0;
|
|
if (!ip_address_pool[i].address)
|
|
continue;
|
|
|
|
cache_ipmap(ip_address_pool[i].address, -i); // Map pool IP to pool index.
|
|
}
|
|
|
|
for (i = 0; i < MAXSESSION; ++i)
|
|
{
|
|
int ipid;
|
|
if (!(session[i].opened && session[i].ip))
|
|
continue;
|
|
|
|
ipid = - lookup_ipmap(htonl(session[i].ip));
|
|
|
|
if (session[i].ip_pool_index < 0)
|
|
{
|
|
// Not allocated out of the pool.
|
|
if (ipid < 1) // Not found in the pool either? good.
|
|
continue;
|
|
|
|
LOG(0, i, 0, "Session %d has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
|
|
i, fmtaddr(session[i].ip, 0), ipid);
|
|
|
|
// Fall through and process it as part of the pool.
|
|
}
|
|
|
|
|
|
if (ipid > MAXIPPOOL || ipid < 0)
|
|
{
|
|
LOG(0, i, 0, "Session %d has a pool IP that's not found in the pool! (%d)\n", i, ipid);
|
|
ipid = -1;
|
|
session[i].ip_pool_index = ipid;
|
|
continue;
|
|
}
|
|
|
|
ip_address_pool[ipid].assigned = 1;
|
|
ip_address_pool[ipid].session = i;
|
|
ip_address_pool[ipid].last = time_now;
|
|
strncpy(ip_address_pool[ipid].user, session[i].user, sizeof(ip_address_pool[ipid].user) - 1);
|
|
session[i].ip_pool_index = ipid;
|
|
cache_ipmap(session[i].ip, i); // Fix the ip map.
|
|
}
|
|
}
|
|
|
|
//
|
|
// Fix the address pool to match a changed session.
|
|
// (usually when the master sends us an update).
|
|
static void fix_address_pool(int sid)
|
|
{
|
|
int ipid;
|
|
|
|
ipid = session[sid].ip_pool_index;
|
|
|
|
if (ipid > ip_pool_size)
|
|
return; // Ignore it. rebuild_address_pool will fix it up.
|
|
|
|
if (ip_address_pool[ipid].address != session[sid].ip)
|
|
return; // Just ignore it. rebuild_address_pool will take care of it.
|
|
|
|
ip_address_pool[ipid].assigned = 1;
|
|
ip_address_pool[ipid].session = sid;
|
|
ip_address_pool[ipid].last = time_now;
|
|
strncpy(ip_address_pool[ipid].user, session[sid].user, sizeof(ip_address_pool[ipid].user) - 1);
|
|
}
|
|
|
|
//
|
|
// Add a block of addresses to the IP pool to hand out.
|
|
//
|
|
static void add_to_ip_pool(in_addr_t addr, in_addr_t mask)
|
|
{
|
|
int i;
|
|
if (mask == 0)
|
|
mask = 0xffffffff; // Host route only.
|
|
|
|
addr &= mask;
|
|
|
|
if (ip_pool_size >= MAXIPPOOL) // Pool is full!
|
|
return ;
|
|
|
|
for (i = addr ;(i & mask) == addr; ++i)
|
|
{
|
|
if ((i & 0xff) == 0 || (i&0xff) == 255)
|
|
continue; // Skip 0 and broadcast addresses.
|
|
|
|
ip_address_pool[ip_pool_size].address = i;
|
|
ip_address_pool[ip_pool_size].assigned = 0;
|
|
++ip_pool_size;
|
|
if (ip_pool_size >= MAXIPPOOL)
|
|
{
|
|
LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr), 0));
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Initialize the IP address pool
|
|
static void initippool()
|
|
{
|
|
FILE *f;
|
|
char *p;
|
|
char buf[4096];
|
|
memset(ip_address_pool, 0, sizeof(ip_address_pool));
|
|
|
|
if (!(f = fopen(IPPOOLFILE, "r")))
|
|
{
|
|
LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE ": %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
|
|
while (ip_pool_size < MAXIPPOOL && fgets(buf, 4096, f))
|
|
{
|
|
char *pool = buf;
|
|
buf[4095] = 0; // Force it to be zero terminated/
|
|
|
|
if (*buf == '#' || *buf == '\n')
|
|
continue; // Skip comments / blank lines
|
|
if ((p = (char *)strrchr(buf, '\n'))) *p = 0;
|
|
if ((p = (char *)strchr(buf, ':')))
|
|
{
|
|
in_addr_t src;
|
|
*p = '\0';
|
|
src = inet_addr(buf);
|
|
if (src == INADDR_NONE)
|
|
{
|
|
LOG(0, 0, 0, "Invalid address pool IP %s\n", buf);
|
|
exit(1);
|
|
}
|
|
// This entry is for a specific IP only
|
|
if (src != config->bind_address)
|
|
continue;
|
|
*p = ':';
|
|
pool = p+1;
|
|
}
|
|
if ((p = (char *)strchr(pool, '/')))
|
|
{
|
|
// It's a range
|
|
int numbits = 0;
|
|
in_addr_t start = 0, mask = 0;
|
|
|
|
LOG(2, 0, 0, "Adding IP address range %s\n", buf);
|
|
*p++ = 0;
|
|
if (!*p || !(numbits = atoi(p)))
|
|
{
|
|
LOG(0, 0, 0, "Invalid pool range %s\n", buf);
|
|
continue;
|
|
}
|
|
start = ntohl(inet_addr(pool));
|
|
mask = (in_addr_t) (pow(2, numbits) - 1) << (32 - numbits);
|
|
|
|
// Add a static route for this pool
|
|
LOG(5, 0, 0, "Adding route for address pool %s/%u\n",
|
|
fmtaddr(htonl(start), 0), 32 + mask);
|
|
|
|
routeset(0, start, mask, 0, 1);
|
|
|
|
add_to_ip_pool(start, mask);
|
|
}
|
|
else
|
|
{
|
|
// It's a single ip address
|
|
add_to_ip_pool(inet_addr(pool), 0);
|
|
}
|
|
}
|
|
fclose(f);
|
|
LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size - 1);
|
|
}
|
|
|
|
void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port)
|
|
{
|
|
struct sockaddr_in snoop_addr = {0};
|
|
if (!destination || !port || snoopfd <= 0 || size <= 0 || !packet)
|
|
return;
|
|
|
|
snoop_addr.sin_family = AF_INET;
|
|
snoop_addr.sin_addr.s_addr = destination;
|
|
snoop_addr.sin_port = ntohs(port);
|
|
|
|
LOG(5, 0, 0, "Snooping %d byte packet to %s:%d\n", size,
|
|
fmtaddr(snoop_addr.sin_addr.s_addr, 0),
|
|
htons(snoop_addr.sin_port));
|
|
|
|
if (sendto(snoopfd, packet, size, MSG_DONTWAIT | MSG_NOSIGNAL, (void *) &snoop_addr, sizeof(snoop_addr)) < 0)
|
|
LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno));
|
|
|
|
STAT(packets_snooped);
|
|
}
|
|
|
|
static int dump_session(FILE **f, sessiont *s)
|
|
{
|
|
if (!s->opened || !s->ip || !(s->cin_delta || s->cout_delta) || !*s->user || s->walled_garden)
|
|
return 1;
|
|
|
|
if (!*f)
|
|
{
|
|
char filename[1024];
|
|
char timestr[64];
|
|
time_t now = time(NULL);
|
|
|
|
strftime(timestr, sizeof(timestr), "%Y%m%d%H%M%S", localtime(&now));
|
|
snprintf(filename, sizeof(filename), "%s/%s", config->accounting_dir, timestr);
|
|
|
|
if (!(*f = fopen(filename, "w")))
|
|
{
|
|
LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename, strerror(errno));
|
|
return 0;
|
|
}
|
|
|
|
LOG(3, 0, 0, "Dumping accounting information to %s\n", filename);
|
|
fprintf(*f, "# dslwatch.pl dump file V1.01\n"
|
|
"# host: %s\n"
|
|
"# endpoint: %s\n"
|
|
"# time: %ld\n"
|
|
"# uptime: %ld\n"
|
|
"# format: username ip qos uptxoctets downrxoctets\n",
|
|
hostname,
|
|
fmtaddr(config->bind_address ? config->bind_address : my_address, 0),
|
|
now,
|
|
now - basetime);
|
|
}
|
|
|
|
LOG(4, 0, 0, "Dumping accounting information for %s\n", s->user);
|
|
fprintf(*f, "%s %s %d %u %u\n",
|
|
s->user, // username
|
|
fmtaddr(htonl(s->ip), 0), // ip
|
|
(s->throttle_in || s->throttle_out) ? 2 : 1, // qos
|
|
(uint32_t) s->cin_delta, // uptxoctets
|
|
(uint32_t) s->cout_delta); // downrxoctets
|
|
|
|
s->cin_delta = s->cout_delta = 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static void dump_acct_info(int all)
|
|
{
|
|
int i;
|
|
FILE *f = NULL;
|
|
|
|
|
|
CSTAT(dump_acct_info);
|
|
|
|
if (shut_acct_n)
|
|
{
|
|
for (i = 0; i < shut_acct_n; i++)
|
|
dump_session(&f, &shut_acct[i]);
|
|
|
|
shut_acct_n = 0;
|
|
}
|
|
|
|
if (all)
|
|
for (i = 1; i <= config->cluster_highest_sessionid; i++)
|
|
dump_session(&f, &session[i]);
|
|
|
|
if (f)
|
|
fclose(f);
|
|
}
|
|
|
|
// Main program
|
|
int main(int argc, char *argv[])
|
|
{
|
|
int i;
|
|
int optdebug = 0;
|
|
char *optconfig = CONFIGFILE;
|
|
|
|
time(&basetime); // start clock
|
|
|
|
// scan args
|
|
while ((i = getopt(argc, argv, "dvc:h:")) >= 0)
|
|
{
|
|
switch (i)
|
|
{
|
|
case 'd':
|
|
if (fork()) exit(0);
|
|
setsid();
|
|
freopen("/dev/null", "r", stdin);
|
|
freopen("/dev/null", "w", stdout);
|
|
freopen("/dev/null", "w", stderr);
|
|
break;
|
|
case 'v':
|
|
optdebug++;
|
|
break;
|
|
case 'c':
|
|
optconfig = optarg;
|
|
break;
|
|
case 'h':
|
|
snprintf(hostname, sizeof(hostname), "%s", optarg);
|
|
break;
|
|
default:
|
|
printf("Args are:\n"
|
|
"\t-d\t\tDetach from terminal\n"
|
|
"\t-c <file>\tConfig file\n"
|
|
"\t-h <hostname>\tForce hostname\n"
|
|
"\t-v\t\tDebug\n");
|
|
|
|
return (0);
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Start the timer routine off
|
|
time(&time_now);
|
|
strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
|
|
signal(SIGALRM, sigalrm_handler);
|
|
siginterrupt(SIGALRM, 0);
|
|
|
|
initplugins();
|
|
initdata(optdebug, optconfig);
|
|
|
|
init_cli(hostname);
|
|
read_config_file();
|
|
init_tbf(config->num_tbfs);
|
|
|
|
LOG(0, 0, 0, "L2TPNS version " VERSION "\n");
|
|
LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005 Optus Internet Engineering\n");
|
|
LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
|
|
{
|
|
struct rlimit rlim;
|
|
rlim.rlim_cur = RLIM_INFINITY;
|
|
rlim.rlim_max = RLIM_INFINITY;
|
|
// Remove the maximum core size
|
|
if (setrlimit(RLIMIT_CORE, &rlim) < 0)
|
|
LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno));
|
|
|
|
// Make core dumps go to /tmp
|
|
chdir("/tmp");
|
|
}
|
|
|
|
if (config->scheduler_fifo)
|
|
{
|
|
int ret;
|
|
struct sched_param params = {0};
|
|
params.sched_priority = 1;
|
|
|
|
if (get_nprocs() < 2)
|
|
{
|
|
LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
|
|
config->scheduler_fifo = 0;
|
|
}
|
|
else
|
|
{
|
|
if ((ret = sched_setscheduler(0, SCHED_FIFO, ¶ms)) == 0)
|
|
{
|
|
LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
|
|
}
|
|
else
|
|
{
|
|
LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno));
|
|
config->scheduler_fifo = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Set up the cluster communications port. */
|
|
if (cluster_init() < 0)
|
|
exit(1);
|
|
|
|
inittun();
|
|
LOG(1, 0, 0, "Set up on interface %s\n", config->tundevice);
|
|
|
|
initudp();
|
|
initrad();
|
|
initippool();
|
|
|
|
// seed prng
|
|
{
|
|
unsigned seed = time_now ^ getpid();
|
|
LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed);
|
|
srand(seed);
|
|
}
|
|
|
|
signal(SIGHUP, sighup_handler);
|
|
signal(SIGCHLD, sigchild_handler);
|
|
signal(SIGTERM, shutdown_handler);
|
|
signal(SIGINT, shutdown_handler);
|
|
signal(SIGQUIT, shutdown_handler);
|
|
|
|
// Prevent us from getting paged out
|
|
if (config->lock_pages)
|
|
{
|
|
if (!mlockall(MCL_CURRENT))
|
|
LOG(1, 0, 0, "Locking pages into memory\n");
|
|
else
|
|
LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno));
|
|
}
|
|
|
|
alarm(1);
|
|
|
|
// Drop privileges here
|
|
if (config->target_uid > 0 && geteuid() == 0)
|
|
setuid(config->target_uid);
|
|
|
|
mainloop();
|
|
|
|
/* remove plugins (so cleanup code gets run) */
|
|
plugins_done();
|
|
|
|
// Remove the PID file if we wrote it
|
|
if (config->wrote_pid && *config->pid_file == '/')
|
|
unlink(config->pid_file);
|
|
|
|
/* kill CLI children */
|
|
signal(SIGTERM, SIG_IGN);
|
|
kill(0, SIGTERM);
|
|
return 0;
|
|
}
|
|
|
|
static void sighup_handler(int sig)
|
|
{
|
|
if (log_stream)
|
|
{
|
|
if (log_stream != stderr)
|
|
fclose(log_stream);
|
|
|
|
log_stream = NULL;
|
|
}
|
|
|
|
read_config_file();
|
|
}
|
|
|
|
static void sigalrm_handler(int sig)
|
|
{
|
|
// Log current traffic stats
|
|
|
|
snprintf(config->bandwidth, sizeof(config->bandwidth),
|
|
"UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
|
|
(udp_rx / 1024.0 / 1024.0 * 8),
|
|
(eth_tx / 1024.0 / 1024.0 * 8),
|
|
(eth_rx / 1024.0 / 1024.0 * 8),
|
|
(udp_tx / 1024.0 / 1024.0 * 8),
|
|
((udp_tx + udp_rx + eth_tx + eth_rx) / 1024.0 / 1024.0 * 8),
|
|
udp_rx_pkt, eth_rx_pkt);
|
|
|
|
udp_tx = udp_rx = 0;
|
|
udp_rx_pkt = eth_rx_pkt = 0;
|
|
eth_tx = eth_rx = 0;
|
|
|
|
if (config->dump_speed)
|
|
printf("%s\n", config->bandwidth);
|
|
|
|
// Update the internal time counter
|
|
time(&time_now);
|
|
strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
|
|
alarm(1);
|
|
|
|
{
|
|
// Run timer hooks
|
|
struct param_timer p = { time_now };
|
|
run_plugins(PLUGIN_TIMER, &p);
|
|
}
|
|
|
|
}
|
|
|
|
static void shutdown_handler(int sig)
|
|
{
|
|
LOG(1, 0, 0, "Shutting down\n");
|
|
main_quit = (sig == SIGQUIT) ? QUIT_SHUTDOWN : QUIT_FAILOVER;
|
|
}
|
|
|
|
static void sigchild_handler(int sig)
|
|
{
|
|
while (waitpid(-1, NULL, WNOHANG) > 0)
|
|
;
|
|
}
|
|
|
|
static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response)
|
|
{
|
|
MD5_CTX ctx;
|
|
*challenge_response = NULL;
|
|
|
|
if (!*config->l2tpsecret)
|
|
{
|
|
LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
|
|
return;
|
|
}
|
|
|
|
LOG(4, 0, 0, " Building challenge response for CHAP request\n");
|
|
|
|
*challenge_response = calloc(17, 1);
|
|
|
|
MD5_Init(&ctx);
|
|
MD5_Update(&ctx, &id, 1);
|
|
MD5_Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret));
|
|
MD5_Update(&ctx, challenge, challenge_length);
|
|
MD5_Final(*challenge_response, &ctx);
|
|
|
|
return;
|
|
}
|
|
|
|
static int facility_value(char *name)
|
|
{
|
|
int i;
|
|
for (i = 0; facilitynames[i].c_name; i++)
|
|
{
|
|
if (strcmp(facilitynames[i].c_name, name) == 0)
|
|
return facilitynames[i].c_val;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void update_config()
|
|
{
|
|
int i;
|
|
char *p;
|
|
static int timeout = 0;
|
|
static int interval = 0;
|
|
|
|
// Update logging
|
|
closelog();
|
|
syslog_log = 0;
|
|
if (log_stream)
|
|
{
|
|
if (log_stream != stderr)
|
|
fclose(log_stream);
|
|
|
|
log_stream = NULL;
|
|
}
|
|
|
|
if (*config->log_filename)
|
|
{
|
|
if (strstr(config->log_filename, "syslog:") == config->log_filename)
|
|
{
|
|
char *p = config->log_filename + 7;
|
|
if (*p)
|
|
{
|
|
openlog("l2tpns", LOG_PID, facility_value(p));
|
|
syslog_log = 1;
|
|
}
|
|
}
|
|
else if (strchr(config->log_filename, '/') == config->log_filename)
|
|
{
|
|
if ((log_stream = fopen((char *)(config->log_filename), "a")))
|
|
{
|
|
fseek(log_stream, 0, SEEK_END);
|
|
setbuf(log_stream, NULL);
|
|
}
|
|
else
|
|
{
|
|
log_stream = stderr;
|
|
setbuf(log_stream, NULL);
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
log_stream = stderr;
|
|
setbuf(log_stream, NULL);
|
|
}
|
|
|
|
// Update radius
|
|
config->numradiusservers = 0;
|
|
for (i = 0; i < MAXRADSERVER; i++)
|
|
if (config->radiusserver[i])
|
|
{
|
|
config->numradiusservers++;
|
|
// Set radius port: if not set, take the port from the
|
|
// first radius server. For the first radius server,
|
|
// take the #defined default value from l2tpns.h
|
|
|
|
// test twice, In case someone works with
|
|
// a secondary radius server without defining
|
|
// a primary one, this will work even then.
|
|
if (i > 0 && !config->radiusport[i])
|
|
config->radiusport[i] = config->radiusport[i-1];
|
|
if (!config->radiusport[i])
|
|
config->radiusport[i] = RADPORT;
|
|
}
|
|
|
|
if (!config->numradiusservers)
|
|
LOG(0, 0, 0, "No RADIUS servers defined!\n");
|
|
|
|
// parse radius_authtypes_s
|
|
config->radius_authtypes = config->radius_authprefer = 0;
|
|
p = config->radius_authtypes_s;
|
|
while (p && *p)
|
|
{
|
|
char *s = strpbrk(p, " \t,");
|
|
int type = 0;
|
|
|
|
if (s)
|
|
{
|
|
*s++ = 0;
|
|
while (*s == ' ' || *s == '\t')
|
|
s++;
|
|
|
|
if (!*s)
|
|
s = 0;
|
|
}
|
|
|
|
if (!strncasecmp("chap", p, strlen(p)))
|
|
type = AUTHCHAP;
|
|
else if (!strncasecmp("pap", p, strlen(p)))
|
|
type = AUTHPAP;
|
|
else
|
|
LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"\n", p);
|
|
|
|
config->radius_authtypes |= type;
|
|
if (!config->radius_authprefer)
|
|
config->radius_authprefer = type;
|
|
|
|
p = s;
|
|
}
|
|
|
|
if (!config->radius_authtypes)
|
|
{
|
|
LOG(0, 0, 0, "Defaulting to PAP authentication\n");
|
|
config->radius_authtypes = config->radius_authprefer = AUTHPAP;
|
|
}
|
|
|
|
// normalise radius_authtypes_s
|
|
if (config->radius_authprefer == AUTHPAP)
|
|
{
|
|
strcpy(config->radius_authtypes_s, "pap");
|
|
if (config->radius_authtypes & AUTHCHAP)
|
|
strcat(config->radius_authtypes_s, ", chap");
|
|
}
|
|
else
|
|
{
|
|
strcpy(config->radius_authtypes_s, "chap");
|
|
if (config->radius_authtypes & AUTHPAP)
|
|
strcat(config->radius_authtypes_s, ", pap");
|
|
}
|
|
|
|
if (!config->radius_dae_port)
|
|
config->radius_dae_port = DAEPORT;
|
|
|
|
// re-initialise the random number source
|
|
initrandom(config->random_device);
|
|
|
|
// Update plugins
|
|
for (i = 0; i < MAXPLUGINS; i++)
|
|
{
|
|
if (strcmp(config->plugins[i], config->old_plugins[i]) == 0)
|
|
continue;
|
|
|
|
if (*config->plugins[i])
|
|
{
|
|
// Plugin added
|
|
add_plugin(config->plugins[i]);
|
|
}
|
|
else if (*config->old_plugins[i])
|
|
{
|
|
// Plugin removed
|
|
remove_plugin(config->old_plugins[i]);
|
|
}
|
|
}
|
|
|
|
memcpy(config->old_plugins, config->plugins, sizeof(config->plugins));
|
|
if (!config->multi_read_count) config->multi_read_count = 10;
|
|
if (!config->cluster_address) config->cluster_address = inet_addr(DEFAULT_MCAST_ADDR);
|
|
if (!*config->cluster_interface)
|
|
strncpy(config->cluster_interface, DEFAULT_MCAST_INTERFACE, sizeof(config->cluster_interface) - 1);
|
|
|
|
if (!config->cluster_hb_interval)
|
|
config->cluster_hb_interval = PING_INTERVAL; // Heartbeat every 0.5 seconds.
|
|
|
|
if (!config->cluster_hb_timeout)
|
|
config->cluster_hb_timeout = HB_TIMEOUT; // 10 missed heartbeat triggers an election.
|
|
|
|
if (interval != config->cluster_hb_interval || timeout != config->cluster_hb_timeout)
|
|
{
|
|
// Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
|
|
// late, ensure we're sufficiently larger than that
|
|
int t = 4 * config->cluster_hb_interval + 11;
|
|
|
|
if (config->cluster_hb_timeout < t)
|
|
{
|
|
LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config->cluster_hb_timeout, t);
|
|
config->cluster_hb_timeout = t;
|
|
}
|
|
|
|
// Push timing changes to the slaves immediately if we're the master
|
|
if (config->cluster_iam_master)
|
|
cluster_heartbeat();
|
|
|
|
interval = config->cluster_hb_interval;
|
|
timeout = config->cluster_hb_timeout;
|
|
}
|
|
|
|
// Write PID file
|
|
if (*config->pid_file == '/' && !config->wrote_pid)
|
|
{
|
|
FILE *f;
|
|
if ((f = fopen(config->pid_file, "w")))
|
|
{
|
|
fprintf(f, "%d\n", getpid());
|
|
fclose(f);
|
|
config->wrote_pid = 1;
|
|
}
|
|
else
|
|
{
|
|
LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config->pid_file, strerror(errno));
|
|
}
|
|
}
|
|
|
|
config->reload_config = 0;
|
|
}
|
|
|
|
static void read_config_file()
|
|
{
|
|
FILE *f;
|
|
|
|
if (!config->config_file) return;
|
|
if (!(f = fopen(config->config_file, "r")))
|
|
{
|
|
fprintf(stderr, "Can't open config file %s: %s\n", config->config_file, strerror(errno));
|
|
return;
|
|
}
|
|
|
|
LOG(3, 0, 0, "Reading config file %s\n", config->config_file);
|
|
cli_do_file(f);
|
|
LOG(3, 0, 0, "Done reading config file\n");
|
|
fclose(f);
|
|
update_config();
|
|
}
|
|
|
|
int sessionsetup(tunnelidt t, sessionidt s)
|
|
{
|
|
// A session now exists, set it up
|
|
in_addr_t ip;
|
|
char *user;
|
|
sessionidt i;
|
|
int r;
|
|
|
|
CSTAT(sessionsetup);
|
|
|
|
LOG(3, s, t, "Doing session setup for session\n");
|
|
|
|
if (!session[s].ip)
|
|
{
|
|
assign_ip_address(s);
|
|
if (!session[s].ip)
|
|
{
|
|
LOG(0, s, t, " No IP allocated. The IP address pool is FULL!\n");
|
|
sessionshutdown(s, "No IP addresses available.", 2, 7); // try another
|
|
return 0;
|
|
}
|
|
LOG(3, s, t, " No IP allocated. Assigned %s from pool\n",
|
|
fmtaddr(htonl(session[s].ip), 0));
|
|
}
|
|
|
|
|
|
// Make sure this is right
|
|
session[s].tunnel = t;
|
|
|
|
// zap old sessions with same IP and/or username
|
|
// Don't kill gardened sessions - doing so leads to a DoS
|
|
// from someone who doesn't need to know the password
|
|
{
|
|
ip = session[s].ip;
|
|
user = session[s].user;
|
|
for (i = 1; i <= config->cluster_highest_sessionid; i++)
|
|
{
|
|
if (i == s) continue;
|
|
if (!session[s].opened) continue;
|
|
if (ip == session[i].ip)
|
|
{
|
|
sessionkill(i, "Duplicate IP address");
|
|
continue;
|
|
}
|
|
|
|
if (config->allow_duplicate_users) continue;
|
|
if (session[s].walled_garden || session[i].walled_garden) continue;
|
|
if (!strcasecmp(user, session[i].user))
|
|
sessionkill(i, "Duplicate session for users");
|
|
}
|
|
}
|
|
|
|
{
|
|
int routed = 0;
|
|
|
|
// Add the route for this session.
|
|
for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
|
|
{
|
|
if ((session[s].ip & session[s].route[r].mask) ==
|
|
(session[s].route[r].ip & session[s].route[r].mask))
|
|
routed++;
|
|
|
|
routeset(s, session[s].route[r].ip, session[s].route[r].mask, 0, 1);
|
|
}
|
|
|
|
// Static IPs need to be routed if not already
|
|
// convered by a Framed-Route. Anything else is part
|
|
// of the IP address pool and is already routed, it
|
|
// just needs to be added to the IP cache.
|
|
// IPv6 route setup is done in ppp.c, when IPV6CP is acked.
|
|
if (session[s].ip_pool_index == -1) // static ip
|
|
{
|
|
if (!routed) routeset(s, session[s].ip, 0, 0, 1);
|
|
}
|
|
else
|
|
cache_ipmap(session[s].ip, s);
|
|
}
|
|
|
|
sess_local[s].lcp_authtype = 0; // RADIUS authentication complete
|
|
lcp_open(t, s); // transition to Network phase and send initial IPCP
|
|
|
|
// Run the plugin's against this new session.
|
|
{
|
|
struct param_new_session data = { &tunnel[t], &session[s] };
|
|
run_plugins(PLUGIN_NEW_SESSION, &data);
|
|
}
|
|
|
|
// Allocate TBFs if throttled
|
|
if (session[s].throttle_in || session[s].throttle_out)
|
|
throttle_session(s, session[s].throttle_in, session[s].throttle_out);
|
|
|
|
session[s].last_packet = time_now;
|
|
|
|
LOG(2, s, t, "Login by %s at %s from %s (%s)\n", session[s].user,
|
|
fmtaddr(htonl(session[s].ip), 0),
|
|
fmtaddr(htonl(tunnel[t].ip), 1), tunnel[t].hostname);
|
|
|
|
cluster_send_session(s); // Mark it as dirty, and needing to the flooded to the cluster.
|
|
|
|
return 1; // RADIUS OK and IP allocated, done...
|
|
}
|
|
|
|
//
|
|
// This session just got dropped on us by the master or something.
|
|
// Make sure our tables up up to date...
|
|
//
|
|
int load_session(sessionidt s, sessiont *new)
|
|
{
|
|
int i;
|
|
int newip = 0;
|
|
|
|
// Sanity checks.
|
|
if (new->ip_pool_index >= MAXIPPOOL ||
|
|
new->tunnel >= MAXTUNNEL)
|
|
{
|
|
LOG(0, s, 0, "Strange session update received!\n");
|
|
// FIXME! What to do here?
|
|
return 0;
|
|
}
|
|
|
|
//
|
|
// Ok. All sanity checks passed. Now we're committed to
|
|
// loading the new session.
|
|
//
|
|
|
|
session[s].tunnel = new->tunnel; // For logging in cache_ipmap
|
|
|
|
// See if routes/ip cache need updating
|
|
if (new->ip != session[s].ip)
|
|
newip++;
|
|
|
|
for (i = 0; !newip && i < MAXROUTE && (session[s].route[i].ip || new->route[i].ip); i++)
|
|
if (new->route[i].ip != session[s].route[i].ip ||
|
|
new->route[i].mask != session[s].route[i].mask)
|
|
newip++;
|
|
|
|
// needs update
|
|
if (newip)
|
|
{
|
|
int routed = 0;
|
|
|
|
// remove old routes...
|
|
for (i = 0; i < MAXROUTE && session[s].route[i].ip; i++)
|
|
{
|
|
if ((session[s].ip & session[s].route[i].mask) ==
|
|
(session[s].route[i].ip & session[s].route[i].mask))
|
|
routed++;
|
|
|
|
routeset(s, session[s].route[i].ip, session[s].route[i].mask, 0, 0);
|
|
}
|
|
|
|
// ...ip
|
|
if (session[s].ip)
|
|
{
|
|
if (session[s].ip_pool_index == -1) // static IP
|
|
{
|
|
if (!routed) routeset(s, session[s].ip, 0, 0, 0);
|
|
}
|
|
else // It's part of the IP pool, remove it manually.
|
|
uncache_ipmap(session[s].ip);
|
|
}
|
|
|
|
routed = 0;
|
|
|
|
// add new routes...
|
|
for (i = 0; i < MAXROUTE && new->route[i].ip; i++)
|
|
{
|
|
if ((new->ip & new->route[i].mask) ==
|
|
(new->route[i].ip & new->route[i].mask))
|
|
routed++;
|
|
|
|
routeset(s, new->route[i].ip, new->route[i].mask, 0, 1);
|
|
}
|
|
|
|
// ...ip
|
|
if (new->ip)
|
|
{
|
|
// If there's a new one, add it.
|
|
if (new->ip_pool_index == -1)
|
|
{
|
|
if (!routed) routeset(s, new->ip, 0, 0, 1);
|
|
}
|
|
else
|
|
cache_ipmap(new->ip, s);
|
|
}
|
|
}
|
|
|
|
// check v6 routing
|
|
if (new->ipv6prefixlen && new->ppp.ipv6cp == Opened && session[s].ppp.ipv6cp != Opened)
|
|
route6set(s, new->ipv6route, new->ipv6prefixlen, 1);
|
|
|
|
// check filters
|
|
if (new->filter_in && (new->filter_in > MAXFILTER || !ip_filters[new->filter_in - 1].name[0]))
|
|
{
|
|
LOG(2, s, session[s].tunnel, "Dropping invalid input filter %d\n", (int) new->filter_in);
|
|
new->filter_in = 0;
|
|
}
|
|
|
|
if (new->filter_out && (new->filter_out > MAXFILTER || !ip_filters[new->filter_out - 1].name[0]))
|
|
{
|
|
LOG(2, s, session[s].tunnel, "Dropping invalid output filter %d\n", (int) new->filter_out);
|
|
new->filter_out = 0;
|
|
}
|
|
|
|
if (new->filter_in != session[s].filter_in)
|
|
{
|
|
if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
|
|
if (new->filter_in) ip_filters[new->filter_in - 1].used++;
|
|
}
|
|
|
|
if (new->filter_out != session[s].filter_out)
|
|
{
|
|
if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
|
|
if (new->filter_out) ip_filters[new->filter_out - 1].used++;
|
|
}
|
|
|
|
if (new->tunnel && s > config->cluster_highest_sessionid) // Maintain this in the slave. It's used
|
|
// for walking the sessions to forward byte counts to the master.
|
|
config->cluster_highest_sessionid = s;
|
|
|
|
memcpy(&session[s], new, sizeof(session[s])); // Copy over..
|
|
|
|
// Do fixups into address pool.
|
|
if (new->ip_pool_index != -1)
|
|
fix_address_pool(s);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static void initplugins()
|
|
{
|
|
int i;
|
|
|
|
loaded_plugins = ll_init();
|
|
// Initialize the plugins to nothing
|
|
for (i = 0; i < MAX_PLUGIN_TYPES; i++)
|
|
plugins[i] = ll_init();
|
|
}
|
|
|
|
static void *open_plugin(char *plugin_name, int load)
|
|
{
|
|
char path[256] = "";
|
|
|
|
snprintf(path, 256, PLUGINDIR "/%s.so", plugin_name);
|
|
LOG(2, 0, 0, "%soading plugin from %s\n", load ? "L" : "Un-l", path);
|
|
return dlopen(path, RTLD_NOW);
|
|
}
|
|
|
|
// plugin callback to get a config value
|
|
static void *getconfig(char *key, enum config_typet type)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; config_values[i].key; i++)
|
|
{
|
|
if (!strcmp(config_values[i].key, key))
|
|
{
|
|
if (config_values[i].type == type)
|
|
return ((void *) config) + config_values[i].offset;
|
|
|
|
LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
|
|
key, type, config_values[i].type);
|
|
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key);
|
|
return 0;
|
|
}
|
|
|
|
static int add_plugin(char *plugin_name)
|
|
{
|
|
static struct pluginfuncs funcs = {
|
|
_log,
|
|
_log_hex,
|
|
fmtaddr,
|
|
sessionbyuser,
|
|
sessiontbysessionidt,
|
|
sessionidtbysessiont,
|
|
radiusnew,
|
|
radiussend,
|
|
getconfig,
|
|
sessionshutdown,
|
|
sessionkill,
|
|
throttle_session,
|
|
cluster_send_session,
|
|
};
|
|
|
|
void *p = open_plugin(plugin_name, 1);
|
|
int (*initfunc)(struct pluginfuncs *);
|
|
int i;
|
|
|
|
if (!p)
|
|
{
|
|
LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror());
|
|
return -1;
|
|
}
|
|
|
|
if (ll_contains(loaded_plugins, p))
|
|
{
|
|
dlclose(p);
|
|
return 0; // already loaded
|
|
}
|
|
|
|
{
|
|
int *v = dlsym(p, "plugin_api_version");
|
|
if (!v || *v != PLUGIN_API_VERSION)
|
|
{
|
|
LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
|
|
dlclose(p);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
if ((initfunc = dlsym(p, "plugin_init")))
|
|
{
|
|
if (!initfunc(&funcs))
|
|
{
|
|
LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
|
|
dlclose(p);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
ll_push(loaded_plugins, p);
|
|
|
|
for (i = 0; i < max_plugin_functions; i++)
|
|
{
|
|
void *x;
|
|
if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
|
|
{
|
|
LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions[i]);
|
|
ll_push(plugins[i], x);
|
|
}
|
|
}
|
|
|
|
LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name);
|
|
return 1;
|
|
}
|
|
|
|
static void run_plugin_done(void *plugin)
|
|
{
|
|
int (*donefunc)(void) = dlsym(plugin, "plugin_done");
|
|
|
|
if (donefunc)
|
|
donefunc();
|
|
}
|
|
|
|
static int remove_plugin(char *plugin_name)
|
|
{
|
|
void *p = open_plugin(plugin_name, 0);
|
|
int loaded = 0;
|
|
|
|
if (!p)
|
|
return -1;
|
|
|
|
if (ll_contains(loaded_plugins, p))
|
|
{
|
|
int i;
|
|
for (i = 0; i < max_plugin_functions; i++)
|
|
{
|
|
void *x;
|
|
if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
|
|
ll_delete(plugins[i], x);
|
|
}
|
|
|
|
ll_delete(loaded_plugins, p);
|
|
run_plugin_done(p);
|
|
loaded = 1;
|
|
}
|
|
|
|
dlclose(p);
|
|
LOG(2, 0, 0, "Removed plugin %s\n", plugin_name);
|
|
return loaded;
|
|
}
|
|
|
|
int run_plugins(int plugin_type, void *data)
|
|
{
|
|
int (*func)(void *data);
|
|
|
|
if (!plugins[plugin_type] || plugin_type > max_plugin_functions)
|
|
return PLUGIN_RET_ERROR;
|
|
|
|
ll_reset(plugins[plugin_type]);
|
|
while ((func = ll_next(plugins[plugin_type])))
|
|
{
|
|
int r = func(data);
|
|
|
|
if (r != PLUGIN_RET_OK)
|
|
return r; // stop here
|
|
}
|
|
|
|
return PLUGIN_RET_OK;
|
|
}
|
|
|
|
static void plugins_done()
|
|
{
|
|
void *p;
|
|
|
|
ll_reset(loaded_plugins);
|
|
while ((p = ll_next(loaded_plugins)))
|
|
run_plugin_done(p);
|
|
}
|
|
|
|
static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen)
|
|
{
|
|
struct nsctl request;
|
|
struct nsctl response;
|
|
int type = unpack_control(&request, buf, len);
|
|
int r;
|
|
void *p;
|
|
|
|
if (log_stream && config->debug >= 4)
|
|
{
|
|
if (type < 0)
|
|
{
|
|
LOG(4, 0, 0, "Bogus control message from %s (%d)\n",
|
|
fmtaddr(addr->sin_addr.s_addr, 0), type);
|
|
}
|
|
else
|
|
{
|
|
LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
|
|
dump_control(&request, log_stream);
|
|
}
|
|
}
|
|
|
|
switch (type)
|
|
{
|
|
case NSCTL_REQ_LOAD:
|
|
if (request.argc != 1)
|
|
{
|
|
response.type = NSCTL_RES_ERR;
|
|
response.argc = 1;
|
|
response.argv[0] = "name of plugin required";
|
|
}
|
|
else if ((r = add_plugin(request.argv[0])) < 1)
|
|
{
|
|
response.type = NSCTL_RES_ERR;
|
|
response.argc = 1;
|
|
response.argv[0] = !r
|
|
? "plugin already loaded"
|
|
: "error loading plugin";
|
|
}
|
|
else
|
|
{
|
|
response.type = NSCTL_RES_OK;
|
|
response.argc = 0;
|
|
}
|
|
|
|
break;
|
|
|
|
case NSCTL_REQ_UNLOAD:
|
|
if (request.argc != 1)
|
|
{
|
|
response.type = NSCTL_RES_ERR;
|
|
response.argc = 1;
|
|
response.argv[0] = "name of plugin required";
|
|
}
|
|
else if ((r = remove_plugin(request.argv[0])) < 1)
|
|
{
|
|
response.type = NSCTL_RES_ERR;
|
|
response.argc = 1;
|
|
response.argv[0] = !r
|
|
? "plugin not loaded"
|
|
: "plugin not found";
|
|
}
|
|
else
|
|
{
|
|
response.type = NSCTL_RES_OK;
|
|
response.argc = 0;
|
|
}
|
|
|
|
break;
|
|
|
|
case NSCTL_REQ_HELP:
|
|
response.type = NSCTL_RES_OK;
|
|
response.argc = 0;
|
|
|
|
ll_reset(loaded_plugins);
|
|
while ((p = ll_next(loaded_plugins)))
|
|
{
|
|
char **help = dlsym(p, "plugin_control_help");
|
|
while (response.argc < 0xff && help && *help)
|
|
response.argv[response.argc++] = *help++;
|
|
}
|
|
|
|
break;
|
|
|
|
case NSCTL_REQ_CONTROL:
|
|
{
|
|
struct param_control param = {
|
|
config->cluster_iam_master,
|
|
request.argc,
|
|
request.argv,
|
|
0,
|
|
NULL,
|
|
};
|
|
|
|
int r = run_plugins(PLUGIN_CONTROL, ¶m);
|
|
|
|
if (r == PLUGIN_RET_ERROR)
|
|
{
|
|
response.type = NSCTL_RES_ERR;
|
|
response.argc = 1;
|
|
response.argv[0] = param.additional
|
|
? param.additional
|
|
: "error returned by plugin";
|
|
}
|
|
else if (r == PLUGIN_RET_NOTMASTER)
|
|
{
|
|
static char msg[] = "must be run on master: 000.000.000.000";
|
|
|
|
response.type = NSCTL_RES_ERR;
|
|
response.argc = 1;
|
|
if (config->cluster_master_address)
|
|
{
|
|
strcpy(msg + 23, fmtaddr(config->cluster_master_address, 0));
|
|
response.argv[0] = msg;
|
|
}
|
|
else
|
|
{
|
|
response.argv[0] = "must be run on master: none elected";
|
|
}
|
|
}
|
|
else if (!(param.response & NSCTL_RESPONSE))
|
|
{
|
|
response.type = NSCTL_RES_ERR;
|
|
response.argc = 1;
|
|
response.argv[0] = param.response
|
|
? "unrecognised response value from plugin"
|
|
: "unhandled action";
|
|
}
|
|
else
|
|
{
|
|
response.type = param.response;
|
|
response.argc = 0;
|
|
if (param.additional)
|
|
{
|
|
response.argc = 1;
|
|
response.argv[0] = param.additional;
|
|
}
|
|
}
|
|
}
|
|
|
|
break;
|
|
|
|
default:
|
|
response.type = NSCTL_RES_ERR;
|
|
response.argc = 1;
|
|
response.argv[0] = "error unpacking control packet";
|
|
}
|
|
|
|
buf = calloc(NSCTL_MAX_PKT_SZ, 1);
|
|
if (!buf)
|
|
{
|
|
LOG(2, 0, 0, "Failed to allocate nsctl response\n");
|
|
return;
|
|
}
|
|
|
|
r = pack_control(buf, NSCTL_MAX_PKT_SZ, response.type, response.argc, response.argv);
|
|
if (r > 0)
|
|
{
|
|
sendto(controlfd, buf, r, 0, (const struct sockaddr *) addr, alen);
|
|
if (log_stream && config->debug >= 4)
|
|
{
|
|
LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
|
|
dump_control(&response, log_stream);
|
|
}
|
|
}
|
|
else
|
|
LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n",
|
|
fmtaddr(addr->sin_addr.s_addr, 0), r);
|
|
|
|
free(buf);
|
|
}
|
|
|
|
static tunnelidt new_tunnel()
|
|
{
|
|
tunnelidt i;
|
|
for (i = 1; i < MAXTUNNEL; i++)
|
|
{
|
|
if (tunnel[i].state == TUNNELFREE)
|
|
{
|
|
LOG(4, 0, i, "Assigning tunnel ID %d\n", i);
|
|
if (i > config->cluster_highest_tunnelid)
|
|
config->cluster_highest_tunnelid = i;
|
|
return i;
|
|
}
|
|
}
|
|
LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
|
|
return 0;
|
|
}
|
|
|
|
//
|
|
// We're becoming the master. Do any required setup..
|
|
//
|
|
// This is principally telling all the plugins that we're
|
|
// now a master, and telling them about all the sessions
|
|
// that are active too..
|
|
//
|
|
void become_master(void)
|
|
{
|
|
int s, i;
|
|
static struct event_data d[RADIUS_FDS];
|
|
struct epoll_event e;
|
|
|
|
run_plugins(PLUGIN_BECOME_MASTER, NULL);
|
|
|
|
// running a bunch of iptables commands is slow and can cause
|
|
// the master to drop tunnels on takeover--kludge around the
|
|
// problem by forking for the moment (note: race)
|
|
if (!fork_and_close())
|
|
{
|
|
for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
|
|
{
|
|
if (!session[s].opened) // Not an in-use session.
|
|
continue;
|
|
|
|
run_plugins(PLUGIN_NEW_SESSION_MASTER, &session[s]);
|
|
}
|
|
exit(0);
|
|
}
|
|
|
|
// add radius fds
|
|
e.events = EPOLLIN;
|
|
for (i = 0; i < RADIUS_FDS; i++)
|
|
{
|
|
d[i].type = FD_TYPE_RADIUS;
|
|
d[i].index = i;
|
|
e.data.ptr = &d[i];
|
|
|
|
epoll_ctl(epollfd, EPOLL_CTL_ADD, radfds[i], &e);
|
|
}
|
|
}
|
|
|
|
int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc)
|
|
{
|
|
int s, i;
|
|
int count = 0;
|
|
int buckets[64];
|
|
|
|
if (CLI_HELP_REQUESTED)
|
|
return CLI_HELP_NO_ARGS;
|
|
|
|
time(&time_now);
|
|
for (i = 0; i < 64;++i) buckets[i] = 0;
|
|
|
|
for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
|
|
{
|
|
int idle;
|
|
if (!session[s].opened)
|
|
continue;
|
|
|
|
idle = time_now - session[s].last_packet;
|
|
idle /= 5 ; // In multiples of 5 seconds.
|
|
if (idle < 0)
|
|
idle = 0;
|
|
if (idle > 63)
|
|
idle = 63;
|
|
|
|
++count;
|
|
++buckets[idle];
|
|
}
|
|
|
|
for (i = 0; i < 63; ++i)
|
|
{
|
|
cli_print(cli, "%3d seconds : %7.2f%% (%6d)", i * 5, (double) buckets[i] * 100.0 / count , buckets[i]);
|
|
}
|
|
cli_print(cli, "lots of secs : %7.2f%% (%6d)", (double) buckets[63] * 100.0 / count , buckets[i]);
|
|
cli_print(cli, "%d total sessions open.", count);
|
|
return CLI_OK;
|
|
}
|
|
|
|
int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc)
|
|
{
|
|
int s, i;
|
|
int count = 0;
|
|
int buckets[64];
|
|
|
|
if (CLI_HELP_REQUESTED)
|
|
return CLI_HELP_NO_ARGS;
|
|
|
|
time(&time_now);
|
|
for (i = 0; i < 64;++i) buckets[i] = 0;
|
|
|
|
for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
|
|
{
|
|
int open = 0, d;
|
|
if (!session[s].opened)
|
|
continue;
|
|
|
|
d = time_now - session[s].opened;
|
|
if (d < 0)
|
|
d = 0;
|
|
while (d > 1 && open < 32)
|
|
{
|
|
++open;
|
|
d >>= 1; // half.
|
|
}
|
|
++count;
|
|
++buckets[open];
|
|
}
|
|
|
|
s = 1;
|
|
for (i = 0; i < 30; ++i)
|
|
{
|
|
cli_print(cli, " < %8d seconds : %7.2f%% (%6d)", s, (double) buckets[i] * 100.0 / count , buckets[i]);
|
|
s <<= 1;
|
|
}
|
|
cli_print(cli, "%d total sessions open.", count);
|
|
return CLI_OK;
|
|
}
|
|
|
|
/* Unhide an avp.
|
|
*
|
|
* This unencodes the AVP using the L2TP secret and the previously
|
|
* stored random vector. It overwrites the hidden data with the
|
|
* unhidden AVP subformat.
|
|
*/
|
|
static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len)
|
|
{
|
|
MD5_CTX ctx;
|
|
uint8_t digest[16];
|
|
uint8_t *last;
|
|
size_t d = 0;
|
|
uint16_t m = htons(type);
|
|
|
|
// Compute initial pad
|
|
MD5_Init(&ctx);
|
|
MD5_Update(&ctx, (unsigned char *) &m, 2);
|
|
MD5_Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret));
|
|
MD5_Update(&ctx, vector, vec_len);
|
|
MD5_Final(digest, &ctx);
|
|
|
|
// pointer to last decoded 16 octets
|
|
last = value;
|
|
|
|
while (len > 0)
|
|
{
|
|
// calculate a new pad based on the last decoded block
|
|
if (d >= sizeof(digest))
|
|
{
|
|
MD5_Init(&ctx);
|
|
MD5_Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret));
|
|
MD5_Update(&ctx, last, sizeof(digest));
|
|
MD5_Final(digest, &ctx);
|
|
|
|
d = 0;
|
|
last = value;
|
|
}
|
|
|
|
*value++ ^= digest[d++];
|
|
len--;
|
|
}
|
|
}
|
|
|
|
int find_filter(char const *name, size_t len)
|
|
{
|
|
int free = -1;
|
|
int i;
|
|
|
|
for (i = 0; i < MAXFILTER; i++)
|
|
{
|
|
if (!*ip_filters[i].name)
|
|
{
|
|
if (free < 0)
|
|
free = i;
|
|
|
|
continue;
|
|
}
|
|
|
|
if (strlen(ip_filters[i].name) != len)
|
|
continue;
|
|
|
|
if (!strncmp(ip_filters[i].name, name, len))
|
|
return i;
|
|
}
|
|
|
|
return free;
|
|
}
|
|
|
|
static int ip_filter_port(ip_filter_portt *p, uint16_t port)
|
|
{
|
|
switch (p->op)
|
|
{
|
|
case FILTER_PORT_OP_EQ: return port == p->port;
|
|
case FILTER_PORT_OP_NEQ: return port != p->port;
|
|
case FILTER_PORT_OP_GT: return port > p->port;
|
|
case FILTER_PORT_OP_LT: return port < p->port;
|
|
case FILTER_PORT_OP_RANGE: return port >= p->port && port <= p->port2;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ip_filter_flag(uint8_t op, uint8_t sflags, uint8_t cflags, uint8_t flags)
|
|
{
|
|
switch (op)
|
|
{
|
|
case FILTER_FLAG_OP_ANY:
|
|
return (flags & sflags) || (~flags & cflags);
|
|
|
|
case FILTER_FLAG_OP_ALL:
|
|
return (flags & sflags) == sflags && (~flags & cflags) == cflags;
|
|
|
|
case FILTER_FLAG_OP_EST:
|
|
return (flags & (TCP_FLAG_ACK|TCP_FLAG_RST)) && (~flags & TCP_FLAG_SYN);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int ip_filter(uint8_t *buf, int len, uint8_t filter)
|
|
{
|
|
uint16_t frag_offset;
|
|
uint8_t proto;
|
|
in_addr_t src_ip;
|
|
in_addr_t dst_ip;
|
|
uint16_t src_port = 0;
|
|
uint16_t dst_port = 0;
|
|
uint8_t flags = 0;
|
|
ip_filter_rulet *rule;
|
|
|
|
if (len < 20) // up to end of destination address
|
|
return 0;
|
|
|
|
if ((*buf >> 4) != 4) // IPv4
|
|
return 0;
|
|
|
|
frag_offset = ntohs(*(uint16_t *) (buf + 6)) & 0x1fff;
|
|
proto = buf[9];
|
|
src_ip = *(in_addr_t *) (buf + 12);
|
|
dst_ip = *(in_addr_t *) (buf + 16);
|
|
|
|
if (frag_offset == 0 && (proto == IPPROTO_TCP || proto == IPPROTO_UDP))
|
|
{
|
|
int l = (buf[0] & 0xf) * 4; // length of IP header
|
|
if (len < l + 4) // ports
|
|
return 0;
|
|
|
|
src_port = ntohs(*(uint16_t *) (buf + l));
|
|
dst_port = ntohs(*(uint16_t *) (buf + l + 2));
|
|
if (proto == IPPROTO_TCP)
|
|
{
|
|
if (len < l + 14) // flags
|
|
return 0;
|
|
|
|
flags = buf[l + 13] & 0x3f;
|
|
}
|
|
}
|
|
|
|
for (rule = ip_filters[filter].rules; rule->action; rule++)
|
|
{
|
|
if (rule->proto != IPPROTO_IP && proto != rule->proto)
|
|
continue;
|
|
|
|
if (rule->src_wild != INADDR_BROADCAST &&
|
|
(src_ip & ~rule->src_wild) != (rule->src_ip & ~rule->src_wild))
|
|
continue;
|
|
|
|
if (rule->dst_wild != INADDR_BROADCAST &&
|
|
(dst_ip & ~rule->dst_wild) != (rule->dst_ip & ~rule->dst_wild))
|
|
continue;
|
|
|
|
if (frag_offset)
|
|
{
|
|
if (!rule->frag || rule->action == FILTER_ACTION_DENY)
|
|
continue;
|
|
}
|
|
else
|
|
{
|
|
if (rule->frag)
|
|
continue;
|
|
|
|
if (proto == IPPROTO_TCP || proto == IPPROTO_UDP)
|
|
{
|
|
if (rule->src_ports.op && !ip_filter_port(&rule->src_ports, src_port))
|
|
continue;
|
|
|
|
if (rule->dst_ports.op && !ip_filter_port(&rule->dst_ports, dst_port))
|
|
continue;
|
|
|
|
if (proto == IPPROTO_TCP && rule->tcp_flag_op &&
|
|
!ip_filter_flag(rule->tcp_flag_op, rule->tcp_sflags, rule->tcp_cflags, flags))
|
|
continue;
|
|
}
|
|
}
|
|
|
|
// matched
|
|
rule->counter++;
|
|
return rule->action == FILTER_ACTION_PERMIT;
|
|
}
|
|
|
|
// default deny
|
|
return 0;
|
|
}
|