X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/667a8bc42060ce5d62ff93058586ce7925ba4449..810e88371a3a238b859adff9969a1f16454d77ad:/ppp.c?ds=inline diff --git a/ppp.c b/ppp.c index 590a52b..6af5066 100644 --- a/ppp.c +++ b/ppp.c @@ -1,6 +1,6 @@ // L2TPNS PPP Stuff -char const *cvs_id_ppp = "$Id: ppp.c,v 1.81 2005/09/15 09:34:49 bodea Exp $"; +char const *cvs_id_ppp = "$Id: ppp.c,v 1.91 2005/12/15 14:23:03 bodea Exp $"; #include #include @@ -449,8 +449,7 @@ static void ppp_code_rej(sessionidt s, tunnelidt t, uint16_t proto, { uint8_t *q; int mru = session[s].mru; - - if (!mru) mru = MAXMRU; + if (mru < MINMTU) mru = MINMTU; if (mru > size) mru = size; l += 4; @@ -461,7 +460,7 @@ static void ppp_code_rej(sessionidt s, tunnelidt t, uint16_t proto, *q = CodeRej; *(q + 1) = ++sess_local[s].lcp_ident; - *(uint16_t *)(q + 2) = l; + *(uint16_t *)(q + 2) = htons(l); memcpy(q + 4, p, l - 4); LOG(2, s, t, "Unexpected %s code %s\n", pname, ppp_code(*p)); @@ -500,7 +499,9 @@ void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) if (session[s].die) // going down... return; - LOG(*p == EchoReq ? 4 : 3, s, t, "LCP: recv %s\n", ppp_code(*p)); + LOG((*p == EchoReq || *p == EchoReply) ? 4 : 3, s, t, + "LCP: recv %s\n", ppp_code(*p)); + if (config->debug > 3) dumplcp(p, l); if (*p == ConfigAck) @@ -579,14 +580,14 @@ void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) case 1: // Maximum-Receive-Unit { uint16_t mru = ntohs(*(uint16_t *)(o + 2)); - if (!config->ppp_mru || mru <= config->ppp_mru) + if (mru >= MINMTU) { session[s].mru = mru; break; } LOG(3, s, t, " Remote requesting MRU of %u. Rejecting.\n", mru); - mru = htons(config->ppp_mru); + mru = htons(MRU); q = ppp_conf_nak(s, b, sizeof(b), PPPLCP, &response, q, p, o, (uint8_t *) &mru, sizeof(mru)); } break; @@ -749,13 +750,12 @@ void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) case 1: // Maximum-Receive-Unit if (*p == ConfigNak) { - session[s].mru = 0; - LOG(3, s, t, " Remote requested MRU of %u; removing option\n", - ntohs(*(uint16_t *)(o + 2))); + sess_local[s].ppp_mru = ntohs(*(uint16_t *)(o + 2)); + LOG(3, s, t, " Remote requested MRU of %u\n", sess_local[s].ppp_mru); } else { - session[s].mru = 0; + sess_local[s].ppp_mru = 0; LOG(3, s, t, " Remote rejected MRU negotiation\n"); } @@ -796,6 +796,7 @@ void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) default: LOG(2, s, t, "LCP: remote sent %s for type %u?\n", ppp_code(*p), type); + sessionshutdown(s, "Unable to negotiate LCP.", 3, 0); break; } x -= length; @@ -917,11 +918,17 @@ static void ipcp_open(sessionidt s, tunnelidt t) change_state(s, ipcp, Opened); - if (!session[s].walled_garden) + if (!(session[s].walled_garden || session[s].flags & SESSION_STARTED)) { uint16_t r = radiusnew(s); if (r) + { radiussend(r, RADIUSSTART); // send radius start + + // don't send further Start records if IPCP is restarted + session[s].flags |= SESSION_STARTED; + cluster_send_session(s); + } } // start IPv6 if configured and still in passive state @@ -1034,7 +1041,7 @@ void processipcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) case 131: // secondary DNS if (o[1] != 6 || o[1] > length) return; - addr = htonl(session[s].dns1); + addr = htonl(session[s].dns2); if (memcmp(o + 2, &addr, sizeof(addr))) { q = ppp_conf_nak(s, b, sizeof(b), PPPIPCP, &response, q, p, o, (uint8_t *) &addr, sizeof(addr)); @@ -1349,6 +1356,13 @@ void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) LOG_HEX(5, "IP", p, l); + if (l < 20) + { + LOG(1, s, t, "IP packet too short %d\n", l); + STAT(tunnel_rx_errors); + return ; + } + ip = ntohl(*(uint32_t *)(p + 12)); if (l > MAXETHER) @@ -1372,6 +1386,14 @@ void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) if (session[s].filter_in && !ip_filter(p, l, session[s].filter_in - 1)) return; + // adjust MSS on SYN and SYN,ACK packets with options + if ((ntohs(*(uint16_t *) (p + 6)) & 0x1fff) == 0 && p[9] == IPPROTO_TCP) // first tcp fragment + { + int ihl = (p[0] & 0xf) * 4; // length of IP header + if (l >= ihl + 20 && (p[ihl + 13] & TCP_FLAG_SYN) && ((p[ihl + 12] >> 4) > 5)) + adjust_tcp_mss(s, t, p, l, p + ihl); + } + // Add on the tun header p -= 4; *(uint32_t *) p = htonl(PKTIP); @@ -1736,9 +1758,7 @@ uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, sessionidt s, tunnelid { if (size < 12) // Need more space than this!! { - static int backtrace_count = 0; LOG(0, s, t, "makeppp buffer too small for L2TP header (size=%d)\n", size); - log_backtrace(backtrace_count, 5) return NULL; } @@ -1746,12 +1766,12 @@ uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, sessionidt s, tunnelid *(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].l2tp_flags & SESSIONACFC)) + if (mtype == PPPLCP || !(session[s].flags & SESSION_ACFC)) { *(uint16_t *) b = htons(0xFF03); // HDLC header b += 2; } - if (mtype < 0x100 && session[s].l2tp_flags & SESSIONPFC) + if (mtype < 0x100 && session[s].flags & SESSION_PFC) *b++ = mtype; else { @@ -1761,9 +1781,7 @@ uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, sessionidt s, tunnelid if (l + 12 > size) { - static int backtrace_count = 0; LOG(2, s, t, "makeppp would overflow buffer (size=%d, header+payload=%d)\n", size, l + 12); - log_backtrace(backtrace_count, 5) return NULL; } @@ -1819,10 +1837,10 @@ void sendlcp(sessionidt s, tunnelidt t) l += 2; //Save space for length - if (session[s].mru) + if (sess_local[s].ppp_mru) { *l++ = 1; *l++ = 4; // Maximum-Receive-Unit (length 4) - *(uint16_t *) l = htons(session[s].mru); l += 2; + *(uint16_t *) l = htons(sess_local[s].ppp_mru); l += 2; } if (authtype) @@ -1838,6 +1856,7 @@ void sendlcp(sessionidt s, tunnelidt t) if (config->debug > 3) dumplcp(q, l - q); tunnelsend(b, (l - b), t); + restart_timer(s, lcp); } // Send CCP request for no compression @@ -1856,4 +1875,35 @@ void sendccp(sessionidt s, tunnelidt t) LOG_HEX(5, "PPPCCP", q, 4); tunnelsend(b, (q - b) + 4 , t); + restart_timer(s, ccp); +} + +// Reject unknown/unconfigured protocols +void protoreject(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint16_t proto) +{ + + uint8_t buf[MAXETHER]; + uint8_t *q; + int mru = session[s].mru; + if (mru < MINMTU) mru = MINMTU; + if (mru > sizeof(buf)) mru = sizeof(buf); + + l += 6; + if (l > mru) l = mru; + + q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPLCP); + if (!q) return; + + *q = ProtocolRej; + *(q + 1) = ++sess_local[s].lcp_ident; + *(uint16_t *)(q + 2) = htons(l); + *(uint16_t *)(q + 4) = htons(proto); + memcpy(q + 6, p, l - 6); + + if (proto == PPPIPV6CP) + LOG(3, s, t, "LCP: send ProtocolRej (IPV6CP: not configured)\n"); + else + LOG(2, s, t, "LCP: sent ProtocolRej (0x%04X: unsupported)\n", proto); + + tunnelsend(buf, l + (q - buf), t); }