Further netlink implementation. Not working yet.
Signed-off-by: Benjamin Cama <benoar@dolka.fr>
This commit is contained in:
Benjamin Cama
parent
c7b02a0927
commit
7aa8cc3dc0
1 changed files with 220 additions and 101 deletions
307
l2tpns.c
307
l2tpns.c
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@ -40,6 +40,7 @@ char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.176 2011/01/20 12:48:40 bodea Exp
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#include <sys/sysinfo.h>
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#include <libcli.h>
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#include <linux/netlink.h>
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#include <linux/rtnetlink.h>
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#include "md5.h"
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#include "l2tpns.h"
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@ -65,8 +66,6 @@ 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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@ -525,86 +524,101 @@ static void initnetlink(void)
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nlfd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
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if (nlfd < 0)
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return; // don't use netlink
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{
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LOG(0, 0, 0, "Can't create netlink socket: %s\n", strerror(errno));
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exit(1);
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}
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memset(&nladdr, 0, sizeof(nladdr));
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nladdr.nl_family = AF_NETLINK;
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nladdr.nl_pid = getpid();
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if (bind(fd, (struct sockaddr *)&nladdr, sizeof(nladdr)) < 0)
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if (bind(nlfd, (struct sockaddr *)&nladdr, sizeof(nladdr)) < 0)
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{
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close(fd);
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fd = -1;
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return; // don't use netlink
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LOG(0, 0, 0, "Can't bind netlink socket: %s\n", strerror(errno));
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exit(1);
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}
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}
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static ssize_t netlink_send(struct nlmsghdr *nh)
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static ssize_t netlink_send(struct nlmsghdr *nh, int want_ack)
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{
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struct sockaddr_nl nladdr;
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struct iovec iov;
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struct msghdr msg;
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ssize_t len;
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char buf[4096];
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struct nlmsghdr *ack_nh;
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nh->nlmsg_pid = getpid();
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nh->nlmsg_seq = ++nlseqnum;
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if (want_ack)
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nh->nlmsg_flags |= NLM_F_ACK;
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iov = { (void *)nh, nh->msg_len };
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// set kernel address
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memset(nladdr, 0, sizeof(nladdr));
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memset(&nladdr, 0, sizeof(nladdr));
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nladdr.nl_family = AF_NETLINK;
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msg = { (void *)&nladdr, sizeof(nladdr), &iov, 1, NULL, 0, 0 };
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if ((len = sendmsg(nlfd, &msg, 0)) < 0)
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return len; // return error code
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iov = (struct iovec){ (void *)nh, nh->nlmsg_len };
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msg = (struct msghdr){ (void *)&nladdr, sizeof(nladdr), &iov, 1, NULL, 0, 0 };
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return sendmsg(nlfd, &msg, 0);
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}
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static ssize_t netlink_recv(char *buf, ssize_t len)
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{
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struct sockaddr_nl nladdr;
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struct iovec iov;
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struct msghdr msg;
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// set kernel address
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memset(&nladdr, 0, sizeof(nladdr));
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nladdr.nl_family = AF_NETLINK;
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iov = (struct iovec){ buf, len };
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msg = (struct msghdr){ (void *)&nladdr, sizeof(nladdr), &iov, 1, NULL, 0, 0 };
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return recvmsg(nlfd, &msg, 0);
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}
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static ssize_t netlink_check_ack(struct nlmsghdr *ack_nh, int msg_count)
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{
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ssize_t len;
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uint32_t seqnum;
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// expect ack
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iov = { buf, sizeof(buf) };
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msg = { (void *)&nladdr, sizeof(nladdr), &iov, 1, NULL, 0, 0 };
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if ((len = recvmsg(nlfd, &msg, 0)) < 0)
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return len; // return error code
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for (ack_nh = (struct nlmsghdr *)buf; NLMSG_OK (ack_nh, len);
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ack_nh = NLMSG_NEXT (ack_nh, len))
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for (; NLMSG_OK (ack_nh, len); ack_nh = NLMSG_NEXT (ack_nh, len))
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{
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if (ack_nh->nlmsg_type == NLMSG_DONE)
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return 1; // didn't get the ack
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return msg_count != 0 || seqnum != nlseqnum;
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// 1 => lost an ack
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if (ack_nh->nlmsg_type == NLMSG_ERROR)
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{
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struct nlmsgerr *errmsg = NLMSG_DATA(ack_nh);
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if (errmsg->error)
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return errmsg->error; // got an error back
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if (errmsg->msg.nlmsg_seq == nh->nlmsg_seq)
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return 0; // ack received
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else
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return 2; // wrong seq number?!
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{
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// ack received
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--msg_count;
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if (errmsg->msg.nlmsg_seq > seqnum);
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seqnum = errmsg->msg.nlmsg_seq;
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}
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}
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else
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// unknown message
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LOG(3, 0, 0, "Got an unknown netlink message: type %d\n", ack_nh->nlmsg_type);
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}
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return 3; // no end message?!
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return 1; // malformed message?!
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}
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// defined in linux/ipv6.h, but tricky to include from user-space
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// TODO: move routing to use netlink rather than ioctl
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struct in6_ifreq {
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struct in6_addr ifr6_addr;
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__u32 ifr6_prefixlen;
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unsigned int ifr6_ifindex;
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};
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//
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// Set up TUN interface
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static void inittun(void)
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{
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struct ifinfomsg ifinfo;
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struct ifreq ifr;
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struct in6_ifreq ifr6;
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struct sockaddr_in sin = {0};
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char buf[4096];
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struct nlmsghdr resp_nh;
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memset(&ifr, 0, sizeof(ifr));
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ifr.ifr_flags = IFF_TUN;
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@ -625,79 +639,184 @@ static void inittun(void)
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}
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assert(strlen(ifr.ifr_name) < sizeof(config->tundevice));
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strncpy(config->tundevice, ifr.ifr_name, sizeof(config->tundevice) - 1);
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{
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struct nlmsghdr nlh;
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{
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LOG(0, 0, 0, "Error setting up tun device: %s", strerror(errno));
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exit(1);
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}
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}
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ifrfd = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP);
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// get the interface index
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ssize_t len;
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struct {
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struct nlmsghdr nh;
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struct ifinfomsg ifinfo __attribute__ ((aligned(NLMSG_ALIGNTO)));
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struct rtattr ifname_rta __attribute__ ((aligned(RTA_ALIGNTO)));
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char ifname[IFNAMSIZ];
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} req;
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sin.sin_family = AF_INET;
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sin.sin_addr.s_addr = config->bind_address ? config->bind_address : 0x01010101; // 1.1.1.1
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memcpy(&ifr.ifr_addr, &sin, sizeof(struct sockaddr));
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req.nh.nlmsg_type = RTM_GETLINK;
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req.nh.nlmsg_flags = NLM_F_REQUEST;
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if (ioctl(ifrfd, SIOCSIFADDR, (void *) &ifr) < 0)
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{
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LOG(0, 0, 0, "Error setting tun address: %s\n", strerror(errno));
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exit(1);
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}
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/* Bump up the qlen to deal with bursts from the network */
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ifr.ifr_qlen = 1000;
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if (ioctl(ifrfd, SIOCSIFTXQLEN, (void *) &ifr) < 0)
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{
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LOG(0, 0, 0, "Error setting tun queue length: %s\n", strerror(errno));
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exit(1);
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}
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/* set MTU to modem MRU */
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ifr.ifr_mtu = MRU;
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if (ioctl(ifrfd, SIOCSIFMTU, (void *) &ifr) < 0)
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{
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LOG(0, 0, 0, "Error setting tun MTU: %s\n", strerror(errno));
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exit(1);
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}
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ifr.ifr_flags = IFF_UP;
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if (ioctl(ifrfd, SIOCSIFFLAGS, (void *) &ifr) < 0)
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{
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LOG(0, 0, 0, "Error setting tun flags: %s\n", strerror(errno));
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exit(1);
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}
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if (ioctl(ifrfd, SIOCGIFINDEX, (void *) &ifr) < 0)
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req.ifinfo.ifi_family = AF_UNSPEC; // as the man says
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req.ifname_rta.rta_len = RTA_LENGTH(strlen(config->tundevice)+1);
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req.ifname_rta.rta_type = IFLA_IFNAME;
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strncpy(req.ifname, config->tundevice, IFNAMSIZ-1);
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if(netlink_send(&req.nh, 0) < 0 || (len = netlink_recv(buf, sizeof(buf))) < 0)
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{
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LOG(0, 0, 0, "Error getting tun ifindex: %s\n", strerror(errno));
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exit(1);
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}
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tunidx = ifr.ifr_ifindex;
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resp_nh = (struct nlmsghdr *)buf;
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if (NLMSG_OK (resp_nh, len) && resp_nh.nlmsg_type == RTM_GETLINK)
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{
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memcpy(&ifinfo, NLMSG_DATA(resp_nh), sizeof(ifinfo));
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// got index
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tunidx = ifinfo.ifi_index;
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}
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else
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{
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LOG(0, 0, 0, "Malformed answer getting tun ifindex\n");
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exit(1);
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}
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}
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{
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ssize_t err;
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struct {
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// interface setting
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struct nlmsghdr nh;
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struct ifinfomsg ifinfo __attribute__ ((aligned(NLMSG_ALIGNTO)));
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struct rtattr txqlen_rta __attribute__ ((aligned(RTA_ALIGNTO)));
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uint32_t txqlen;
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struct rtattr mtu_rta __attribute__ ((aligned(RTA_ALIGNTO)));
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uint32_t mtu;
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// IPv4 address
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struct nlmsghdr addr_nh __attribute __ ((aligned(NLMSG_ALIGNTO)));
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struct ifaddrmsg ifaddr __attribute __ ((aligned(NLMSG_ALIGNTO)));
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struct rtattr addr_rta __attribute __ ((aligned(RTA_ALIGNTO)));
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struct in_addr addr;
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// IPv6 LL address
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struct nlmsghdr lladdr6_nh __attribute __ ((aligned(NLMSG_ALIGNTO)));
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struct ifaddrmsg llifaddr6 __attribute __ ((aligned(NLMSG_ALIGNTO)));
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struct rtattr lladdr6_rta __attribute __ ((aligned(RTA_ALIGNTO)));
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struct in6_addr lladdr6;
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// IPv6 global address
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struct nlmsghdr addr6_nh __attribute __ ((aligned(NLMSG_ALIGNTO)));
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struct ifaddrmsg ifaddr6 __attribute __ ((aligned(NLMSG_ALIGNTO)));
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struct rtattr addr6_rta __attribute __ ((aligned(RTA_ALIGNTO)));
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struct in6_addr addr6;
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// end header
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struct nlmsghdr end_nh __attribute __ ((aligned(NLMSG_ALIGNTO)));
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} req;
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char buf[4096];
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memset(&req, 0, sizeof(req));
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req.nh.nlmsg_type = RTM_NEWLINK;
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req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_REPLACE | NLM_F_MULTI;
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req.ifinfo = ifinfo;
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req.ifinfo.ifi_flags |= IFF_UP; // set interface up
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req.ifinfo.ifi_change = IFF_UP; // only change this flag
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req.txqlen_rta.rta_len = RTA_LENGTH(sizeof(req.txqlen));
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req.txqlen_rta.rta_type = IFLA_TXQLEN;
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/* Bump up the qlen to deal with bursts from the network */
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req.txqlen = 1000;
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req.mtu_rta.rta_len = RTA_LENGTH(sizeof(req.txqlen));
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req.mtu_rta.rta_type = IFLA_MTU;
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/* set MTU to modem MRU */
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req.mtu = MRU;
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req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifinfo)
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+ req.txqlen_rla.rta_len
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+ req.mtu_rta.rta_len);
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req.addr_nh.nlmsg_type = RTM_NEWADDR;
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req.addr_nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_MULTI;
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req.ifaddr.ifa_family = AF_INET;
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req.ifaddr.ifa_prefixlen = 32;
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req.ifaddr.ifa_index = ifinfo.ifi_index;
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req.addr_rta.rta_len = RTA_LENGTH(sizeof(req.addr));
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req.addr_rta.rta_type = IFA_ADDRESS;
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req.addr.s_addr = config->bind_address ?
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config->bind_address : 0x01010101; // 1.1.1.1
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req.addr_nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifaddr)
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+ req.addr_rta.rta_len);
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// Only setup IPv6 on the tun device if we have a configured prefix
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if (config->ipv6_prefix.s6_addr[0]) {
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ifr6fd = socket(PF_INET6, SOCK_DGRAM, 0);
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req.lladdr6_nh.nlmsg_type = RTM_NEWADDR;
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req.lladdr6_nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_MULTI;
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req.llifaddr6.ifa_family = AF_INET6;
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req.llifaddr6.ifa_prefixlen = 64;
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req.llifaddr6.ifa_scope = RT_SCOPE_LINK;
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req.llifaddr6.ifa_index = ifinfo.ifi_index;
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req.lladdr6_rta.rta_len = RTA_LENGTH(sizeof(req.lladdr6));
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req.lladdr6_rta.rta_type = IFA_LOCAL;
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// Link local address is FE80::1
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memset(&ifr6.ifr6_addr, 0, sizeof(ifr6.ifr6_addr));
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ifr6.ifr6_addr.s6_addr[0] = 0xFE;
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ifr6.ifr6_addr.s6_addr[1] = 0x80;
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ifr6.ifr6_addr.s6_addr[15] = 1;
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ifr6.ifr6_prefixlen = 64;
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ifr6.ifr6_ifindex = ifr.ifr_ifindex;
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if (ioctl(ifr6fd, SIOCSIFADDR, (void *) &ifr6) < 0)
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memset(&req.lladdr6, 0, sizeof(req.lladdr6));
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req.lladdr6.s6_addr[0] = 0xFE;
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req.lladdr6.s6_addr[1] = 0x80;
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req.lladdr6.s6_addr[15] = 1;
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req.lladdr6_nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifaddr)
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+ req.lladdr6_rta.rta_len);
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req.addr6_nh.nlmsg_type = RTM_NEWADDR;
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req.addr6_nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_MULTI;
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req.ifaddr6.ifa_family = AF_INET6;
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req.ifaddr6.ifa_prefixlen = 64;
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req.ifaddr6.ifa_scope = RT_SCOPE_UNIVERSE;
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req.ifaddr6.ifa_index = ifinfo.ifi_index;
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req.addr6_rta.rta_len = RTA_LENGTH(sizeof(req.addr6));
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req.addr6_rta.rta_type = IFA_LOCAL;
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// Global address is prefix::1
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req.addr6 = config->ipv6_prefix;
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req.addr6.s6_addr[15] = 1;
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req.lladdr6_nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifaddr)
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+ req.lladdr6_rta.rta_len);
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req.end_nh.nlmsg_type = NLMSG_DONE;
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req.end_nh.nlmsg_len = NLMSG_LENGTH(0);
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}
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else
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{
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LOG(0, 0, 0, "Error setting tun IPv6 link local address:"
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" %s\n", strerror(errno));
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// we terminate at the beginning of IPv6 stuff
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req.lladdr6_nh.nlmsg_type = NLMSG_DONE;
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req.lladdr6_nh.nlmsg_len = NLMSG_LENGTH(0);
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}
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// Global address is prefix::1
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memset(&ifr6.ifr6_addr, 0, sizeof(ifr6.ifr6_addr));
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ifr6.ifr6_addr = config->ipv6_prefix;
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ifr6.ifr6_addr.s6_addr[15] = 1;
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ifr6.ifr6_prefixlen = 64;
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ifr6.ifr6_ifindex = ifr.ifr_ifindex;
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if (ioctl(ifr6fd, SIOCSIFADDR, (void *) &ifr6) < 0)
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if (netlink_send(&req.nh, 1) < 0)
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LOG(0, 0, 0, "Error setting up tun device: %s\n", strerror(errno));
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exit(1);
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}
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if (netlink_recv(buf, sizeof(buf)) < 0)
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{
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LOG(0, 0, 0, "Error setting tun IPv6 global address: %s\n",
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strerror(errno));
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LOG(0, 0, 0, "Error waiting ack for setting up tun device: %s\n", strerror(errno));
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exit(1);
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}
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resp_nh = (struct nlmsghdr *)buf;
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if ((err = netlink_check_ack(resp_nh, 4)))
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{
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if (err < 0)
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LOG(0, 0, 0, "Error while receiving tun device ack: %s\n", strerror(errno));
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else
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LOG(0, 0, 0, "Error while receiving tun device ack\n", strerror(errno));
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exit(1);
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}
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}
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}
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