add Multilink support from Khaled Al Hamwi
This commit is contained in:
Brendan O'Dea
parent
57a847d9a3
commit
5faf075c8d
13 changed files with 1021 additions and 97 deletions
535
ppp.c
535
ppp.c
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@ -1,6 +1,6 @@
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// L2TPNS PPP Stuff
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char const *cvs_id_ppp = "$Id: ppp.c,v 1.99 2006-04-18 06:00:08 bodea Exp $";
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char const *cvs_id_ppp = "$Id: ppp.c,v 1.100 2006-04-27 09:53:50 bodea Exp $";
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#include <stdio.h>
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#include <string.h>
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@ -15,6 +15,8 @@ char const *cvs_id_ppp = "$Id: ppp.c,v 1.99 2006-04-18 06:00:08 bodea Exp $";
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#include "cluster.h"
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extern tunnelt *tunnel;
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extern bundlet *bundle;
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extern fragmentationt *frag;
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extern sessiont *session;
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extern radiust *radius;
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extern int tunfd;
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@ -24,6 +26,10 @@ extern time_t time_now;
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extern configt *config;
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static int add_lcp_auth(uint8_t *b, int size, int authtype);
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static bundleidt new_bundle(void);
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static int epdiscmp(epdist, epdist);
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static void setepdis(epdist *, epdist);
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static void ipcp_open(sessionidt s, tunnelidt t);
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// Process PAP messages
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void processpap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
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@ -90,7 +96,7 @@ void processpap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
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// respond now, either no RADIUS available or already authenticated
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uint8_t b[MAXETHER];
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uint8_t id = p[1];
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uint8_t *p = makeppp(b, sizeof(b), 0, 0, s, t, PPPPAP);
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uint8_t *p = makeppp(b, sizeof(b), 0, 0, s, t, PPPPAP, 0, 0, 0);
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if (!p) return;
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if (session[s].ip)
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@ -352,16 +358,29 @@ void lcp_open(sessionidt s, tunnelidt t)
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}
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else
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{
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// This-Layer-Up
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sendipcp(s, t);
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change_state(s, ipcp, RequestSent);
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// move to passive state for IPv6 (if configured), CCP
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if (config->ipv6_prefix.s6_addr[0])
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change_state(s, ipv6cp, Stopped);
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if (session[s].bundle && bundle[session[s].bundle].num_of_links > 1)
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{
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sessionidt first_ses = bundle[session[s].bundle].members[0];
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LOG(3, s, t, "MPPP: Skipping IPCP negotiation for session:%d, first session of bundle is:%d\n", s, first_ses);
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session[s].ip = session[first_ses].ip;
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session[s].dns1 = session[first_ses].dns1;
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session[s].dns2 = session[first_ses].dns2;
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session[s].timeout = session[first_ses].timeout;
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ipcp_open(s, t);
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}
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else
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change_state(s, ipv6cp, Closed);
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{
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// This-Layer-Up
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sendipcp(s, t);
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change_state(s, ipcp, RequestSent);
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// move to passive state for IPv6 (if configured), CCP
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if (config->ipv6_prefix.s6_addr[0])
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change_state(s, ipv6cp, Stopped);
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else
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change_state(s, ipv6cp, Closed);
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change_state(s, ccp, Stopped);
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change_state(s, ccp, Stopped);
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}
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}
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}
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@ -379,7 +398,7 @@ static uint8_t *ppp_conf_rej(sessionidt s, uint8_t *buf, size_t blen, uint16_t m
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{
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if (!*response || **response != ConfigRej)
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{
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queued = *response = makeppp(buf, blen, packet, 2, s, session[s].tunnel, mtype);
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queued = *response = makeppp(buf, blen, packet, 2, s, session[s].tunnel, mtype, 0, 0, 0);
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if (!queued)
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return 0;
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@ -423,7 +442,7 @@ static uint8_t *ppp_conf_nak(sessionidt s, uint8_t *buf, size_t blen, uint16_t m
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if (*nak_sent >= config->ppp_max_failure)
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return ppp_conf_rej(s, buf, blen, mtype, response, 0, packet, option);
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queued = *response = makeppp(buf, blen, packet, 2, s, session[s].tunnel, mtype);
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queued = *response = makeppp(buf, blen, packet, 2, s, session[s].tunnel, mtype, 0, 0, 0);
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if (!queued)
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return 0;
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@ -455,7 +474,7 @@ static void ppp_code_rej(sessionidt s, tunnelidt t, uint16_t proto,
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l += 4;
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if (l > mru) l = mru;
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q = makeppp(buf, size, 0, 0, s, t, proto);
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q = makeppp(buf, size, 0, 0, s, t, proto, 0, 0, 0);
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if (!q) return;
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*q = CodeRej;
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@ -567,6 +586,7 @@ void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
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uint8_t *response = 0;
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static uint8_t asyncmap[4] = { 0, 0, 0, 0 }; // all zero
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static uint8_t authproto[5];
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int changed = 0;
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while (x > 2)
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{
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@ -582,7 +602,7 @@ void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
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if (mru >= MINMTU)
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{
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session[s].mru = mru;
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cluster_send_session(s);
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changed++;
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break;
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}
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@ -655,6 +675,64 @@ void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
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case 8: // Address-And-Control-Field-Compression
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break;
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case 17: // Multilink Max-Receive-Reconstructed-Unit
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{
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uint16_t mrru = ntohs(*(uint16_t *)(o + 2));
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session[s].mrru = mrru;
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changed++;
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LOG(3, s, t, " Received PPP LCP option MRRU: %d\n",mrru);
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}
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break;
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case 18: // Multilink Short Sequence Number Header Format
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{
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session[s].mssf = 1;
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changed++;
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LOG(3, s, t, " Received PPP LCP option MSSN format\n");
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}
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break;
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case 19: // Multilink Endpoint Discriminator
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{
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uint8_t epdis_class = o[2];
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int addr;
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session[s].epdis.addr_class = epdis_class;
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session[s].epdis.length = length - 3;
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if (session[s].epdis.length > 20)
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{
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LOG(1, s, t, "Error: received EndDis Address Length more than 20: %d\n", session[s].epdis.length);
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session[s].epdis.length = 20;
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}
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for (addr = 0; addr < session[s].epdis.length; addr++)
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session[s].epdis.address[addr] = o[3+addr];
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changed++;
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switch (epdis_class)
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{
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case LOCALADDR:
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LOG(3, s, t, " Received PPP LCP option Multilink EndDis Local Address Class: %d\n",epdis_class);
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break;
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case IPADDR:
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LOG(3, s, t, " Received PPP LCP option Multilink EndDis IP Address Class: %d\n",epdis_class);
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break;
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case IEEEMACADDR:
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LOG(3, s, t, " Received PPP LCP option Multilink EndDis IEEE MAC Address Class: %d\n",epdis_class);
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break;
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case PPPMAGIC:
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LOG(3, s, t, " Received PPP LCP option Multilink EndDis PPP Magic No Class: %d\n",epdis_class);
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break;
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case PSNDN:
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LOG(3, s, t, " Received PPP LCP option Multilink EndDis PSND No Class: %d\n",epdis_class);
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break;
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default:
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LOG(3, s, t, " Received PPP LCP option Multilink EndDis NULL Class %d\n",epdis_class);
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}
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}
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break;
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default: // Reject any unknown options
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LOG(3, s, t, " Rejecting unknown PPP LCP option %d\n", type);
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q = ppp_conf_rej(s, b, sizeof(b), PPPLCP, &response, q, p, o);
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@ -663,6 +741,9 @@ void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
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o += length;
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}
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if (changed)
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cluster_send_session(s);
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if (response)
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{
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l = q - response; // LCP packet length
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@ -671,7 +752,7 @@ void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
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else
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{
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// Send packet back as ConfigAck
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response = makeppp(b, sizeof(b), p, l, s, t, PPPLCP);
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response = makeppp(b, sizeof(b), p, l, s, t, PPPLCP, 0, 0, 0);
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if (!response) return;
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*response = ConfigAck;
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}
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@ -679,7 +760,7 @@ void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
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switch (session[s].ppp.lcp)
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{
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case Closed:
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response = makeppp(b, sizeof(b), p, 2, s, t, PPPLCP);
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response = makeppp(b, sizeof(b), p, 2, s, t, PPPLCP, 0, 0, 0);
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if (!response) return;
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*response = TerminateAck;
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*((uint16_t *) (response + 2)) = htons(l = 4);
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@ -812,6 +893,50 @@ void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
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cluster_send_session(s);
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break;
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case 17: // Multilink Max-Receive-Reconstructed-Unit
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{
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if (*p == ConfigNak)
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{
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sess_local[s].mp_mrru = ntohs(*(uint16_t *)(o + 2));
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LOG(3, s, t, " Remote requested MRRU of %u\n", sess_local[s].mp_mrru);
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}
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else
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{
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sess_local[s].mp_mrru = 0;
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LOG(3, s, t, " Remote rejected MRRU negotiation\n");
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}
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}
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break;
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case 18: // Multilink Short Sequence Number Header Format
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{
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if (*p == ConfigNak)
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{
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sess_local[s].mp_mssf = 0;
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LOG(3, s, t, " Remote requested Naked mssf\n");
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}
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else
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{
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sess_local[s].mp_mssf = 0;
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LOG(3, s, t, " Remote rejected mssf\n");
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}
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}
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break;
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case 19: // Multilink Endpoint Discriminator
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{
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if (*p == ConfigNak)
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{
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LOG(2, s, t, " Remote should not configNak Endpoint Dis!\n");
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}
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else
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{
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sess_local[s].mp_epdis = 0;
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LOG(3, s, t, " Remote rejected Endpoint Discriminator\n");
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}
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}
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break;
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default:
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LOG(2, s, t, "LCP: remote sent %s for type %u?\n", ppp_code(*p), type);
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sessionshutdown(s, "Unable to negotiate LCP.", CDN_ADMIN_DISC, TERM_USER_ERROR);
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@ -835,7 +960,7 @@ void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
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case Closed:
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case Stopped:
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{
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uint8_t *response = makeppp(b, sizeof(b), p, 2, s, t, PPPLCP);
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uint8_t *response = makeppp(b, sizeof(b), p, 2, s, t, PPPLCP, 0, 0, 0);
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if (!response) return;
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*response = TerminateAck;
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*((uint16_t *) (response + 2)) = htons(l = 4);
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@ -893,7 +1018,7 @@ void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
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}
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*p = TerminateAck; // send ack
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q = makeppp(b, sizeof(b), p, l, s, t, PPPLCP);
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q = makeppp(b, sizeof(b), p, l, s, t, PPPLCP, 0, 0, 0);
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if (!q) return;
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LOG(3, s, t, "LCP: send %s\n", ppp_code(*q));
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@ -929,7 +1054,7 @@ void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
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{
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*p = EchoReply; // reply
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*(uint32_t *) (p + 4) = htonl(session[s].magic); // our magic number
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q = makeppp(b, sizeof(b), p, l, s, t, PPPLCP);
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q = makeppp(b, sizeof(b), p, l, s, t, PPPLCP, 0, 0, 0);
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if (!q) return;
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LOG(4, s, t, "LCP: send %s\n", ppp_code(*q));
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@ -947,6 +1072,93 @@ void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
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}
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}
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int join_bundle(sessionidt s)
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{
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// Search for a bundle to join
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bundleidt i;
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bundleidt b;
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for (i = 1; i < MAXBUNDLE; i++)
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{
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if (bundle[i].state != BUNDLEFREE)
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{
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if (epdiscmp(session[s].epdis,bundle[i].epdis) && !strcmp(session[s].user, bundle[i].user))
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{
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session[s].bundle = i;
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bundle[i].mrru = session[s].mrru;
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bundle[i].mssf = session[s].mssf;
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if (session[s].epdis.length > 0)
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setepdis(&bundle[i].epdis, session[s].epdis);
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strcpy(bundle[i].user, session[s].user);
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bundle[i].members[bundle[i].num_of_links] = s;
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bundle[i].num_of_links++;
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LOG(3, s, session[s].tunnel, "MPPP: Bundling additional line in bundle (%d), lines:%d\n",i,bundle[i].num_of_links);
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return i;
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}
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}
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}
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// No previously created bundle was found for this session, so create a new one
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if (!(b = new_bundle())) return 0;
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session[s].bundle = b;
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bundle[b].mrru = session[s].mrru;
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bundle[b].mssf = session[s].mssf;
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if (session[s].epdis.length > 0)
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setepdis(&bundle[b].epdis, session[s].epdis);
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strcpy(bundle[b].user, session[s].user);
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bundle[b].members[0] = s;
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LOG(3, s, session[s].tunnel, "MPPP: Created a new bundle (%d)\n", b);
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return b;
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}
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static int epdiscmp(epdist ep1, epdist ep2)
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{
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int ad;
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if (ep1.length != ep2.length)
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return 0;
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if (ep1.addr_class != ep2.addr_class)
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return 0;
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for (ad = 0; ad < ep1.length; ad++)
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if (ep1.address[ad] != ep2.address[ad])
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return 0;
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return 1;
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}
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static void setepdis(epdist *ep1, epdist ep2)
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{
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int ad;
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ep1->length = ep2.length;
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ep1->addr_class = ep2.addr_class;
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for (ad = 0; ad < ep2.length; ad++)
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ep1->address[ad] = ep2.address[ad];
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}
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static bundleidt new_bundle()
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{
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bundleidt i;
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for (i = 1; i < MAXBUNDLE; i++)
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{
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if (bundle[i].state == BUNDLEFREE)
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{
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LOG(4, 0, 0, "MPPP: Assigning bundle ID %d\n", i);
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bundle[i].num_of_links = 1;
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bundle[i].last_check = time_now; // Initialize last_check value
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bundle[i].state = BUNDLEOPEN;
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bundle[i].current_ses = -1; // This is to enforce the first session 0 to be used at first
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if (i > config->cluster_highest_bundleid)
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config->cluster_highest_bundleid = i;
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return i;
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}
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}
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LOG(0, 0, 0, "MPPP: Can't find a free bundle! There shouldn't be this many in use!\n");
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return 0;
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}
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static void ipcp_open(sessionidt s, tunnelidt t)
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{
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LOG(3, s, t, "IPCP: Opened, session is now active\n");
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@ -1105,7 +1317,7 @@ void processipcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
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else if (gotip)
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{
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// Send packet back as ConfigAck
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response = makeppp(b, sizeof(b), p, l, s, t, PPPIPCP);
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response = makeppp(b, sizeof(b), p, l, s, t, PPPIPCP, 0, 0, 0);
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if (!response) return;
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*response = ConfigAck;
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}
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@ -1119,7 +1331,7 @@ void processipcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
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switch (session[s].ppp.ipcp)
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{
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case Closed:
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response = makeppp(b, sizeof(b), p, 2, s, t, PPPIPCP);
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response = makeppp(b, sizeof(b), p, 2, s, t, PPPIPCP, 0, 0, 0);
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if (!response) return;
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*response = TerminateAck;
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*((uint16_t *) (response + 2)) = htons(l = 4);
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|
|
@ -1192,7 +1404,7 @@ void processipcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
|
|||
}
|
||||
|
||||
*p = TerminateAck; // send ack
|
||||
q = makeppp(b, sizeof(b), p, l, s, t, PPPIPCP);
|
||||
q = makeppp(b, sizeof(b), p, l, s, t, PPPIPCP, 0, 0, 0);
|
||||
if (!q) return;
|
||||
|
||||
LOG(3, s, t, "IPCP: send %s\n", ppp_code(*q));
|
||||
|
|
@ -1326,7 +1538,7 @@ void processipv6cp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
|
|||
else if (gotip)
|
||||
{
|
||||
// Send packet back as ConfigAck
|
||||
response = makeppp(b, sizeof(b), p, l, s, t, PPPIPV6CP);
|
||||
response = makeppp(b, sizeof(b), p, l, s, t, PPPIPV6CP, 0, 0, 0);
|
||||
if (!response) return;
|
||||
*response = ConfigAck;
|
||||
}
|
||||
|
|
@ -1340,7 +1552,7 @@ void processipv6cp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
|
|||
switch (session[s].ppp.ipv6cp)
|
||||
{
|
||||
case Closed:
|
||||
response = makeppp(b, sizeof(b), p, 2, s, t, PPPIPV6CP);
|
||||
response = makeppp(b, sizeof(b), p, 2, s, t, PPPIPV6CP, 0, 0, 0);
|
||||
if (!response) return;
|
||||
*response = TerminateAck;
|
||||
*((uint16_t *) (response + 2)) = htons(l = 4);
|
||||
|
|
@ -1413,7 +1625,7 @@ void processipv6cp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
|
|||
}
|
||||
|
||||
*p = TerminateAck; // send ack
|
||||
q = makeppp(b, sizeof(b), p, l, s, t, PPPIPV6CP);
|
||||
q = makeppp(b, sizeof(b), p, l, s, t, PPPIPV6CP, 0, 0, 0);
|
||||
if (!q) return;
|
||||
|
||||
LOG(3, s, t, "IPV6CP: send %s\n", ppp_code(*q));
|
||||
|
|
@ -1456,11 +1668,14 @@ void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
|
|||
if (session[s].ppp.phase != Network || session[s].ppp.ipcp != Opened)
|
||||
return;
|
||||
|
||||
// no spoof (do sessionbyip to handled statically routed subnets)
|
||||
if (ip != session[s].ip && sessionbyip(htonl(ip)) != s)
|
||||
if (!session[s].bundle || bundle[session[s].bundle].num_of_links < 2) // FIXME:
|
||||
{
|
||||
LOG(5, s, t, "Dropping packet with spoofed IP %s\n", fmtaddr(htonl(ip), 0));
|
||||
return;
|
||||
// no spoof (do sessionbyip to handled statically routed subnets)
|
||||
if (ip != session[s].ip && sessionbyip(htonl(ip)) != s)
|
||||
{
|
||||
LOG(4, s, t, "Dropping packet with spoofed IP %s\n", fmtaddr(htonl(ip), 0));
|
||||
return;
|
||||
}
|
||||
}
|
||||
|
||||
// run access-list if any
|
||||
|
|
@ -1526,6 +1741,167 @@ void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
|
|||
INC_STAT(tun_tx_bytes, l);
|
||||
}
|
||||
|
||||
// process Multilink PPP packet received
|
||||
void processmpin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
|
||||
{
|
||||
bundleidt b = session[s].bundle;
|
||||
uint8_t begin_frame;
|
||||
uint8_t end_frame;
|
||||
uint32_t seq_num;
|
||||
uint32_t offset;
|
||||
|
||||
if (!b)
|
||||
{
|
||||
LOG(3, s, t, "MPPP: Invalid bundle id: 0\n");
|
||||
return;
|
||||
}
|
||||
|
||||
begin_frame = (*p & 0x80);
|
||||
end_frame = (*p & 0x40);
|
||||
if (session[s].mssf)
|
||||
{
|
||||
// Get 12 bit for seq number
|
||||
uint16_t short_seq_num = ntohs((*(uint16_t *) p) & 0xFF0F);
|
||||
uint16_t short_seq_num2 = short_seq_num >> 4;
|
||||
p += 2;
|
||||
l -= 2;
|
||||
seq_num = short_seq_num2;
|
||||
// After this point the pointer should be advanced 2 bytes
|
||||
LOG(3, s, t, "MPPP: 12 bits, sequence number: %d, short1: %d, short2: %d\n",seq_num, short_seq_num, short_seq_num2);
|
||||
}
|
||||
else
|
||||
{
|
||||
// Get 24 bit for seq number
|
||||
p++;
|
||||
seq_num = ntohl((*(uint32_t *) p) & 0xFFFFFF00);
|
||||
seq_num = seq_num >> 8;
|
||||
p += 3;
|
||||
l -= 4;
|
||||
// After this point the pointer should be advanced 4 bytes
|
||||
LOG(4, s, t, "MPPP: 24 bits sequence number:%d\n",seq_num);
|
||||
}
|
||||
|
||||
if (seq_num - bundle[b].offset < 0)
|
||||
{
|
||||
bundle[b].offset = 0;
|
||||
bundle[b].pending_frag = 0;
|
||||
}
|
||||
|
||||
offset = bundle[b].offset;
|
||||
if (begin_frame)
|
||||
{
|
||||
// Check for previous non-assembled frames
|
||||
int error = 0;
|
||||
if (bundle[b].pending_frag)
|
||||
{
|
||||
uint32_t fn = bundle[b].seq_num_m - offset;
|
||||
uint16_t cur_len;
|
||||
bundle[b].pending_frag = 0;
|
||||
// Check for array indexes
|
||||
if (fn < 0 || fn > MAXFRAGNUM)
|
||||
{
|
||||
LOG(2, s, t, "ERROR: Index out of range fn:%d, bundle:%d\n",fn,b);
|
||||
return;
|
||||
}
|
||||
|
||||
if (seq_num-offset < 0 || seq_num-offset > MAXFRAGNUM)
|
||||
{
|
||||
LOG(2, s, t, "ERROR: Index out of range fn(last):%d, bundle:%d\n",fn,b);
|
||||
return;
|
||||
}
|
||||
/////////////////////////////////////////////////////
|
||||
cur_len = 4; // This is set to 4 to leave 4 bytes for function processipin
|
||||
for (fn = bundle[b].seq_num_m - offset; fn < seq_num - offset; fn++)
|
||||
{
|
||||
if (!frag[b].fragment[fn].length)
|
||||
{
|
||||
LOG(4, s, t, "MPPP: Found lost fragment while reassembling frame %d in (%d,%d)\n",fn, bundle[b].seq_num_m-offset, seq_num-offset);
|
||||
error = 1;
|
||||
break;
|
||||
}
|
||||
|
||||
if (cur_len + frag[b].fragment[fn].length > MAXETHER)
|
||||
{
|
||||
LOG(2, s, t, "MPPP: ERROR: very long frame after assembling %d\n", frag[b].fragment[fn].length+cur_len);
|
||||
error = 1;
|
||||
break;
|
||||
}
|
||||
|
||||
memcpy(frag[b].reassembled_frame+cur_len, frag[b].fragment[fn].data, frag[b].fragment[fn].length);
|
||||
cur_len += frag[b].fragment[fn].length;
|
||||
frag[b].fragment[fn].length = 0; // Indicates that this fragment has been consumed
|
||||
// This is usefull for compression
|
||||
memset(frag[b].fragment[fn].data, 0, sizeof(frag[b].fragment[fn].data));
|
||||
}
|
||||
|
||||
if (!error)
|
||||
{
|
||||
frag[b].re_frame_len = cur_len;
|
||||
// Process the resassembled frame
|
||||
LOG(4, s, t, "MPPP: Process the reassembled frame, len=%d\n",cur_len);
|
||||
processmpframe(s, t, frag[b].reassembled_frame, frag[b].re_frame_len, 1);
|
||||
// Set reassembled frame length to zero after processing it
|
||||
frag[b].re_frame_len = 0;
|
||||
memset(frag[b].reassembled_frame, 0, sizeof(frag[b].reassembled_frame));
|
||||
}
|
||||
}
|
||||
//////////////////////////////////////////
|
||||
bundle[b].seq_num_m = seq_num;
|
||||
if (end_frame)
|
||||
{
|
||||
// Both bits are set
|
||||
LOG(4, s, t, "MPPP: Both bits are set (Begin and End).\n");
|
||||
processmpframe(s, t, p, l, 0);
|
||||
// The maximum number of fragments is 1500
|
||||
if (seq_num - bundle[b].offset >= 1400)
|
||||
{
|
||||
bundle[b].offset = seq_num;
|
||||
LOG(4, s, t, "MPPP: Setting offset to: %d\n",bundle[b].offset);
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
bundle[b].pending_frag = 1;
|
||||
// End bit is clear
|
||||
LOG(4, s, t, "MPPP: Push to receive buffer\n");
|
||||
// Push to the receive buffer
|
||||
// Array indexes checking
|
||||
if (seq_num-offset < 0 || seq_num-offset >= MAXFRAGNUM)
|
||||
{
|
||||
LOG(2, s, t, "ERROR: Index out of range, push to receive buffer(1) seq:%d, offset:%d, bundle:%d\n",seq_num,offset,b);
|
||||
return;
|
||||
}
|
||||
// Perform length checking
|
||||
if (l > MAXFRAGLEN)
|
||||
{
|
||||
LOG(2, s, t, "MPPP: ERROR: very long fragment length (1)\n");
|
||||
return;
|
||||
}
|
||||
frag[b].fragment[seq_num - offset].length = l;
|
||||
memcpy(frag[b].fragment[seq_num - offset].data, p, l);
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
LOG(4, s, t, "MPPP: Push to receive buffer\n");
|
||||
// Push to the receive buffer
|
||||
// Array indexes checking
|
||||
if (seq_num-offset < 0 || seq_num-offset >= MAXFRAGNUM)
|
||||
{
|
||||
LOG(2, s, t, "ERROR: Index out of range, push to receive buffer(2) seq:%d, offset:%d, bundle:%d\n",seq_num,offset,b);
|
||||
return;
|
||||
}
|
||||
// Perform length checking
|
||||
if (l > MAXFRAGLEN)
|
||||
{
|
||||
LOG(2, s, t, "MPPP: ERROR: very long fragment length (2).\n");
|
||||
return;
|
||||
}
|
||||
frag[b].fragment[seq_num - offset].length = l;
|
||||
memcpy(frag[b].fragment[seq_num - offset].data, p, l);
|
||||
}
|
||||
}
|
||||
|
||||
// process IPv6 packet received
|
||||
//
|
||||
// This MUST be called with at least 4 byte behind 'p'.
|
||||
|
|
@ -1685,7 +2061,7 @@ void processccp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
|
|||
STAT(tunnel_rx_errors);
|
||||
}
|
||||
|
||||
LOG(3, s, t, "CCP: recv %s\n", ppp_code(*p));
|
||||
LOG(4, s, t, "CCP: recv %s\n", ppp_code(*p));
|
||||
if (*p == ConfigAck)
|
||||
{
|
||||
switch (session[s].ppp.ccp)
|
||||
|
|
@ -1718,13 +2094,13 @@ void processccp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
|
|||
else // compression requested--reject
|
||||
*p = ConfigRej;
|
||||
|
||||
q = makeppp(b, sizeof(b), p, l, s, t, PPPCCP);
|
||||
q = makeppp(b, sizeof(b), p, l, s, t, PPPCCP, 0, 0, 0);
|
||||
if (!q) return;
|
||||
|
||||
switch (session[s].ppp.ccp)
|
||||
{
|
||||
case Closed:
|
||||
q = makeppp(b, sizeof(b), p, 2, s, t, PPPCCP);
|
||||
q = makeppp(b, sizeof(b), p, 2, s, t, PPPCCP, 0, 0, 0);
|
||||
if (!q) return;
|
||||
*q = TerminateAck;
|
||||
*((uint16_t *) (q + 2)) = htons(l = 4);
|
||||
|
|
@ -1770,13 +2146,13 @@ void processccp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
|
|||
return;
|
||||
}
|
||||
|
||||
LOG(3, s, t, "CCP: send %s\n", ppp_code(*q));
|
||||
LOG(4, s, t, "CCP: send %s\n", ppp_code(*q));
|
||||
tunnelsend(b, l + (q - b), t);
|
||||
}
|
||||
else if (*p == TerminateReq)
|
||||
{
|
||||
*p = TerminateAck;
|
||||
q = makeppp(b, sizeof(b), p, l, s, t, PPPCCP);
|
||||
q = makeppp(b, sizeof(b), p, l, s, t, PPPCCP, 0, 0, 0);
|
||||
if (!q) return;
|
||||
LOG(3, s, t, "CCP: send %s\n", ppp_code(*q));
|
||||
tunnelsend(b, l + (q - b), t);
|
||||
|
|
@ -1820,7 +2196,7 @@ void sendchap(sessionidt s, tunnelidt t)
|
|||
STAT(tunnel_tx_errors);
|
||||
return ;
|
||||
}
|
||||
q = makeppp(b, sizeof(b), 0, 0, s, t, PPPCHAP);
|
||||
q = makeppp(b, sizeof(b), 0, 0, s, t, PPPCHAP, 0, 0, 0);
|
||||
if (!q) return;
|
||||
|
||||
*q = 1; // challenge
|
||||
|
|
@ -1834,37 +2210,86 @@ void sendchap(sessionidt s, tunnelidt t)
|
|||
|
||||
// fill in a L2TP message with a PPP frame,
|
||||
// returns start of PPP frame
|
||||
uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, sessionidt s, tunnelidt t, uint16_t mtype)
|
||||
uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, sessionidt s, tunnelidt t, uint16_t mtype, uint8_t prio, bundleidt bid, uint8_t mp_bits)
|
||||
{
|
||||
if (size < 12) // Need more space than this!!
|
||||
uint16_t hdr = 0x0002; // L2TP with no options
|
||||
uint16_t type = mtype;
|
||||
uint8_t *start = b;
|
||||
|
||||
if (size < 16) // Need more space than this!!
|
||||
{
|
||||
LOG(0, s, t, "makeppp buffer too small for L2TP header (size=%d)\n", size);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
*(uint16_t *) (b + 0) = htons(0x0002); // L2TP with no options
|
||||
if (prio) hdr |= 0x0100; // set priority bit
|
||||
|
||||
*(uint16_t *) (b + 0) = htons(hdr);
|
||||
*(uint16_t *) (b + 2) = htons(tunnel[t].far); // tunnel
|
||||
*(uint16_t *) (b + 4) = htons(session[s].far); // session
|
||||
b += 6;
|
||||
if (mtype == PPPLCP || !(session[s].flags & SESSION_ACFC))
|
||||
|
||||
// Check whether this session is part of multilink
|
||||
if (bid)
|
||||
{
|
||||
if (bundle[bid].num_of_links > 1)
|
||||
type = PPPMP; // Change PPP message type to the PPPMP
|
||||
else
|
||||
bid = 0;
|
||||
}
|
||||
|
||||
if (type == PPPLCP || !(session[s].flags & SESSION_ACFC))
|
||||
{
|
||||
*(uint16_t *) b = htons(0xFF03); // HDLC header
|
||||
b += 2;
|
||||
}
|
||||
if (mtype < 0x100 && session[s].flags & SESSION_PFC)
|
||||
*b++ = mtype;
|
||||
|
||||
if (type < 0x100 && session[s].flags & SESSION_PFC)
|
||||
{
|
||||
*b++ = type;
|
||||
}
|
||||
else
|
||||
{
|
||||
*(uint16_t *) b = htons(mtype);
|
||||
*(uint16_t *) b = htons(type);
|
||||
b += 2;
|
||||
}
|
||||
|
||||
if (l + 12 > size)
|
||||
if (bid)
|
||||
{
|
||||
LOG(2, s, t, "makeppp would overflow buffer (size=%d, header+payload=%d)\n", size, l + 12);
|
||||
// Set the sequence number and (B)egin (E)nd flags
|
||||
if (session[s].mssf)
|
||||
{
|
||||
// Set the multilink bits
|
||||
uint16_t bits_send = mp_bits;
|
||||
*(uint16_t *) b = htons((bundle[bid].seq_num_t & 0xFF0F)|bits_send);
|
||||
b += 2;
|
||||
}
|
||||
else
|
||||
{
|
||||
*(uint32_t *) b = htonl(bundle[bid].seq_num_t);
|
||||
// Set the multilink bits
|
||||
*b = mp_bits;
|
||||
b += 4;
|
||||
}
|
||||
|
||||
bundle[bid].seq_num_t++;
|
||||
|
||||
// Add the message type if this fragment has the begin bit set
|
||||
if (mp_bits & MP_BEGIN)
|
||||
{
|
||||
//*b++ = mtype; // The next two lines are instead of this
|
||||
*(uint16_t *) b = htons(mtype); // Message type
|
||||
b += 2;
|
||||
}
|
||||
}
|
||||
|
||||
if ((b - start) + l > size)
|
||||
{
|
||||
LOG(2, s, t, "makeppp would overflow buffer (size=%d, header+payload=%d)\n", size, (b - start) + l);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
// Copy the payload
|
||||
if (p && l)
|
||||
memcpy(b, p, l);
|
||||
|
||||
|
|
@ -1903,10 +2328,10 @@ void sendlcp(sessionidt s, tunnelidt t)
|
|||
uint8_t b[500], *q, *l;
|
||||
int authtype = sess_local[s].lcp_authtype;
|
||||
|
||||
if (!(q = makeppp(b, sizeof(b), NULL, 0, s, t, PPPLCP)))
|
||||
if (!(q = makeppp(b, sizeof(b), NULL, 0, s, t, PPPLCP, 0, 0, 0)))
|
||||
return;
|
||||
|
||||
LOG(3, s, t, "LCP: send ConfigReq%s%s%s\n",
|
||||
LOG(3, s, t, "LCP: send ConfigReq%s%s%s including MP options\n",
|
||||
authtype ? " (" : "",
|
||||
authtype ? (authtype == AUTHCHAP ? "CHAP" : "PAP") : "",
|
||||
authtype ? ")" : "");
|
||||
|
|
@ -1933,6 +2358,20 @@ void sendlcp(sessionidt s, tunnelidt t)
|
|||
l += 4;
|
||||
}
|
||||
|
||||
if (sess_local[s].mp_mrru)
|
||||
{
|
||||
*l++ = 17; *l++ = 4; // Multilink Max-Receive-Reconstructed-Unit (length 4)
|
||||
*(uint16_t *) l = htons(sess_local[s].mp_mrru); l += 2;
|
||||
}
|
||||
|
||||
if (sess_local[s].mp_epdis)
|
||||
{
|
||||
*l++ = 19; *l++ = 7; // Multilink Endpoint Discriminator (length 7)
|
||||
*l++ = IPADDR; // Endpoint Discriminator class
|
||||
*(uint32_t *) l = htonl(sess_local[s].mp_epdis);
|
||||
l += 4;
|
||||
}
|
||||
|
||||
*(uint16_t *)(q + 2) = htons(l - q); // Length
|
||||
|
||||
LOG_HEX(5, "PPPLCP", q, l - q);
|
||||
|
|
@ -1947,7 +2386,7 @@ void sendccp(sessionidt s, tunnelidt t)
|
|||
{
|
||||
uint8_t b[500], *q;
|
||||
|
||||
if (!(q = makeppp(b, sizeof(b), NULL, 0, s, t, PPPCCP)))
|
||||
if (!(q = makeppp(b, sizeof(b), NULL, 0, s, t, PPPCCP, 0, 0, 0)))
|
||||
return;
|
||||
|
||||
LOG(3, s, t, "CCP: send ConfigReq (no compression)\n");
|
||||
|
|
@ -1974,7 +2413,7 @@ void protoreject(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint16_t pro
|
|||
l += 6;
|
||||
if (l > mru) l = mru;
|
||||
|
||||
q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPLCP);
|
||||
q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPLCP, 0, 0, 0);
|
||||
if (!q) return;
|
||||
|
||||
*q = ProtocolRej;
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue