X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/afc8f4c6c019f3cd4c8c28fbf7948b594de08658..464d19fbb248153d34982f52692a0bd11a825d1d:/ppp.c?ds=inline diff --git a/ppp.c b/ppp.c index ff8d4c1..fd89d91 100644 --- a/ppp.c +++ b/ppp.c @@ -1,6 +1,6 @@ // L2TPNS PPP Stuff -char const *cvs_id_ppp = "$Id: ppp.c,v 1.65 2005/07/31 10:04:10 bodea Exp $"; +char const *cvs_id_ppp = "$Id: ppp.c,v 1.101 2006/06/03 08:16:46 bodea Exp $"; #include #include @@ -15,6 +15,8 @@ char const *cvs_id_ppp = "$Id: ppp.c,v 1.65 2005/07/31 10:04:10 bodea Exp $"; #include "cluster.h" extern tunnelt *tunnel; +extern bundlet *bundle; +extern fragmentationt *frag; extern sessiont *session; extern radiust *radius; extern int tunfd; @@ -24,9 +26,13 @@ extern time_t time_now; extern configt *config; static int add_lcp_auth(uint8_t *b, int size, int authtype); +static bundleidt new_bundle(void); +static int epdiscmp(epdist, epdist); +static void setepdis(epdist *, epdist); +static void ipcp_open(sessionidt s, tunnelidt t); // Process PAP messages -void processpap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) +void processpap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) { char user[MAXUSER]; char pass[MAXPASS]; @@ -40,7 +46,7 @@ void processpap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) { LOG(1, s, t, "Short PAP %u bytes\n", l); STAT(tunnel_rx_errors); - sessionshutdown(s, "Short PAP packet.", 3, 0); + sessionshutdown(s, "Short PAP packet.", CDN_ADMIN_DISC, TERM_USER_ERROR); return; } @@ -48,7 +54,7 @@ void processpap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) { LOG(1, s, t, "Length mismatch PAP %u/%u\n", hl, l); STAT(tunnel_rx_errors); - sessionshutdown(s, "PAP length mismatch.", 3, 0); + sessionshutdown(s, "PAP length mismatch.", CDN_ADMIN_DISC, TERM_USER_ERROR); return; } l = hl; @@ -57,7 +63,7 @@ void processpap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) { LOG(1, s, t, "Unexpected PAP code %d\n", *p); STAT(tunnel_rx_errors); - sessionshutdown(s, "Unexpected PAP code.", 3, 0); + sessionshutdown(s, "Unexpected PAP code.", CDN_ADMIN_DISC, TERM_USER_ERROR); return; } @@ -85,13 +91,12 @@ void processpap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) LOG(3, s, t, "PAP login %s/%s\n", user, pass); } - r = radiusnew(s); - if (session[s].ip || !r) + if (session[s].ip || !(r = radiusnew(s))) { // respond now, either no RADIUS available or already authenticated - uint8_t b[MAXCONTROL]; + uint8_t b[MAXETHER]; uint8_t id = p[1]; - uint8_t *p = makeppp(b, sizeof(b), 0, 0, t, s, PPPPAP); + uint8_t *p = makeppp(b, sizeof(b), 0, 0, s, t, PPPPAP, 0, 0, 0); if (!p) return; if (session[s].ip) @@ -111,7 +116,7 @@ void processpap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) else { LOG(1, s, t, "No RADIUS session available to authenticate session...\n"); - sessionshutdown(s, "No free RADIUS sessions.", 4, 0); + sessionshutdown(s, "No free RADIUS sessions.", CDN_UNAVAILABLE, TERM_SERVICE_UNAVAILABLE); } } else @@ -134,13 +139,13 @@ void processpap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) free(packet.password); radius[r].id = p[1]; - LOG(3, s, t, "Sending login for %s/%s to radius\n", user, pass); + LOG(3, s, t, "Sending login for %s/%s to RADIUS\n", user, pass); radiussend(r, RADIUSAUTH); } } // Process CHAP messages -void processchap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) +void processchap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) { uint16_t r; uint16_t hl; @@ -148,19 +153,12 @@ void processchap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) CSTAT(processchap); LOG_HEX(5, "CHAP", p, l); - r = sess_local[s].radius; - if (!r) - { - LOG(1, s, t, "Unexpected CHAP message\n"); - STAT(tunnel_rx_errors); - return; - } if (l < 4) { LOG(1, s, t, "Short CHAP %u bytes\n", l); STAT(tunnel_rx_errors); - sessionshutdown(s, "Short CHAP packet.", 3, 0); + sessionshutdown(s, "Short CHAP packet.", CDN_ADMIN_DISC, TERM_USER_ERROR); return; } @@ -168,7 +166,7 @@ void processchap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) { LOG(1, s, t, "Length mismatch CHAP %u/%u\n", hl, l); STAT(tunnel_rx_errors); - sessionshutdown(s, "CHAP length mismatch.", 3, 0); + sessionshutdown(s, "CHAP length mismatch.", CDN_ADMIN_DISC, TERM_USER_ERROR); return; } l = hl; @@ -177,7 +175,7 @@ void processchap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) { LOG(1, s, t, "Unexpected CHAP response code %d\n", *p); STAT(tunnel_rx_errors); - sessionshutdown(s, "CHAP length mismatch.", 3, 0); + sessionshutdown(s, "CHAP length mismatch.", CDN_ADMIN_DISC, TERM_USER_ERROR); return; } @@ -187,11 +185,26 @@ void processchap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) return; } + r = sess_local[s].radius; + if (!r) + { + LOG(3, s, t, "Unexpected CHAP message\n"); + + // Some modems (Netgear DM602, possibly others) persist in using CHAP even + // after ACKing our ConfigReq for PAP. + if (sess_local[s].lcp_authtype == AUTHPAP && config->radius_authtypes & AUTHCHAP) + { + sess_local[s].lcp_authtype = AUTHCHAP; + sendchap(s, t); + } + return; + } + if (p[1] != radius[r].id) { LOG(1, s, t, "Wrong CHAP response ID %d (should be %d) (%d)\n", p[1], radius[r].id, r); STAT(tunnel_rx_errors); - sessionshutdown(s, "Unexpected CHAP response ID.", 3, 0); + sessionshutdown(s, "Unexpected CHAP response ID.", CDN_ADMIN_DISC, TERM_USER_ERROR); return; } @@ -199,7 +212,7 @@ void processchap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) { LOG(1, s, t, "Bad CHAP response length %d\n", l < 5 ? -1 : p[4]); STAT(tunnel_rx_errors); - sessionshutdown(s, "Bad CHAP response length.", 3, 0); + sessionshutdown(s, "Bad CHAP response length.", CDN_ADMIN_DISC, TERM_USER_ERROR); return; } @@ -209,7 +222,7 @@ void processchap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) { LOG(1, s, t, "CHAP user too long %d\n", l - 16); STAT(tunnel_rx_errors); - sessionshutdown(s, "CHAP username too long.", 3, 0); + sessionshutdown(s, "CHAP username too long.", CDN_ADMIN_DISC, TERM_USER_ERROR); return; } @@ -289,24 +302,24 @@ static void dumplcp(uint8_t *p, int l) LOG(4, 0, 0, " %s %x\n", ppp_lcp_option(type), asyncmap); } else - LOG(4, 0, 0, " %s odd length %d\n", ppp_lcp_option(type), length); + LOG(4, 0, 0, " %s odd length %d\n", ppp_lcp_option(type), length); break; case 3: // Authentication-Protocol if (length == 4) { int proto = ntohs(*(uint16_t *)(o + 2)); - LOG(4, 0, 0, " %s 0x%x (%s)\n", ppp_lcp_option(type), proto, + LOG(4, 0, 0, " %s 0x%x (%s)\n", ppp_lcp_option(type), proto, proto == PPPPAP ? "PAP" : "UNSUPPORTED"); } else if (length == 5) { int proto = ntohs(*(uint16_t *)(o + 2)); - int algo = *(uint8_t *)(o + 4); - LOG(4, 0, 0, " %s 0x%x 0x%x (%s)\n", ppp_lcp_option(type), proto, algo, + int algo = *(o + 4); + LOG(4, 0, 0, " %s 0x%x 0x%x (%s)\n", ppp_lcp_option(type), proto, algo, (proto == PPPCHAP && algo == 5) ? "CHAP MD5" : "UNSUPPORTED"); } else - LOG(4, 0, 0, " %s odd length %d\n", ppp_lcp_option(type), length); + LOG(4, 0, 0, " %s odd length %d\n", ppp_lcp_option(type), length); break; case 4: // Quality-Protocol { @@ -321,7 +334,7 @@ static void dumplcp(uint8_t *p, int l) LOG(4, 0, 0, " %s %x\n", ppp_lcp_option(type), magicno); } else - LOG(4, 0, 0, " %s odd length %d\n", ppp_lcp_option(type), length); + LOG(4, 0, 0, " %s odd length %d\n", ppp_lcp_option(type), length); break; case 7: // Protocol-Field-Compression case 8: // Address-And-Control-Field-Compression @@ -336,31 +349,46 @@ static void dumplcp(uint8_t *p, int l) } } -void lcp_open(tunnelidt t, sessionidt s) +void lcp_open(sessionidt s, tunnelidt t) { // transition to Authentication or Network phase: session[s].ppp.phase = sess_local[s].lcp_authtype ? Authenticate : Network; + LOG(3, s, t, "LCP: Opened, phase %s\n", ppp_phase(session[s].ppp.phase)); + // LCP now Opened change_state(s, lcp, Opened); if (session[s].ppp.phase == Authenticate) { if (sess_local[s].lcp_authtype == AUTHCHAP) - sendchap(t, s); + sendchap(s, t); } else { - // This-Layer-Up - sendipcp(t, s); - change_state(s, ipcp, RequestSent); - // move to passive state for IPv6 (if configured), CCP - if (config->ipv6_prefix.s6_addr[0]) - change_state(s, ipv6cp, Stopped); + if (session[s].bundle && bundle[session[s].bundle].num_of_links > 1) + { + sessionidt first_ses = bundle[session[s].bundle].members[0]; + LOG(3, s, t, "MPPP: Skipping IPCP negotiation for session:%d, first session of bundle is:%d\n", s, first_ses); + session[s].ip = session[first_ses].ip; + session[s].dns1 = session[first_ses].dns1; + session[s].dns2 = session[first_ses].dns2; + session[s].timeout = session[first_ses].timeout; + ipcp_open(s, t); + } else - change_state(s, ipv6cp, Closed); + { + // This-Layer-Up + sendipcp(s, t); + change_state(s, ipcp, RequestSent); + // move to passive state for IPv6 (if configured), CCP + if (config->ipv6_prefix.s6_addr[0]) + change_state(s, ipv6cp, Stopped); + else + change_state(s, ipv6cp, Closed); - change_state(s, ccp, Stopped); + change_state(s, ccp, Stopped); + } } } @@ -373,12 +401,12 @@ static void lcp_restart(sessionidt s) change_state(s, ccp, Dead); } -static uint8_t *ppp_rej(sessionidt s, uint8_t *buf, size_t blen, uint16_t mtype, +static uint8_t *ppp_conf_rej(sessionidt s, uint8_t *buf, size_t blen, uint16_t mtype, uint8_t **response, uint8_t *queued, uint8_t *packet, uint8_t *option) { if (!*response || **response != ConfigRej) { - queued = *response = makeppp(buf, blen, packet, 2, session[s].tunnel, s, mtype); + queued = *response = makeppp(buf, blen, packet, 2, s, session[s].tunnel, mtype, 0, 0, 0); if (!queued) return 0; @@ -396,7 +424,7 @@ static uint8_t *ppp_rej(sessionidt s, uint8_t *buf, size_t blen, uint16_t mtype, return queued + option[1]; } -static uint8_t *ppp_nak(sessionidt s, uint8_t *buf, size_t blen, uint16_t mtype, +static uint8_t *ppp_conf_nak(sessionidt s, uint8_t *buf, size_t blen, uint16_t mtype, uint8_t **response, uint8_t *queued, uint8_t *packet, uint8_t *option, uint8_t *value, size_t vlen) { @@ -414,19 +442,19 @@ static uint8_t *ppp_nak(sessionidt s, uint8_t *buf, size_t blen, uint16_t mtype, if (*nak_sent < config->ppp_max_failure) // reject queued return queued; - return ppp_rej(s, buf, blen, mtype, response, 0, packet, option); + return ppp_conf_rej(s, buf, blen, mtype, response, 0, packet, option); } if (!*response) { if (*nak_sent >= config->ppp_max_failure) - return ppp_rej(s, buf, blen, mtype, response, 0, packet, option); + return ppp_conf_rej(s, buf, blen, mtype, response, 0, packet, option); - queued = *response = makeppp(buf, blen, packet, 2, session[s].tunnel, s, mtype); + queued = *response = makeppp(buf, blen, packet, 2, s, session[s].tunnel, mtype, 0, 0, 0); if (!queued) return 0; - *nak_sent++; + (*nak_sent)++; *queued = ConfigNak; queued += 4; } @@ -443,12 +471,37 @@ static uint8_t *ppp_nak(sessionidt s, uint8_t *buf, size_t blen, uint16_t mtype, return queued + vlen; } +static void ppp_code_rej(sessionidt s, tunnelidt t, uint16_t proto, + char *pname, uint8_t *p, uint16_t l, uint8_t *buf, size_t size) +{ + uint8_t *q; + int mru = session[s].mru; + if (mru < MINMTU) mru = MINMTU; + if (mru > size) mru = size; + + l += 4; + if (l > mru) l = mru; + + q = makeppp(buf, size, 0, 0, s, t, proto, 0, 0, 0); + if (!q) return; + + *q = CodeRej; + *(q + 1) = ++sess_local[s].lcp_ident; + *(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)); + LOG(3, s, t, "%s: send %s\n", pname, ppp_code(*q)); + if (config->debug > 3) dumplcp(q, l); + + tunnelsend(buf, l + (q - buf), t); +} + // Process LCP messages -void processlcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) +void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) { - uint8_t b[MAXCONTROL]; + uint8_t b[MAXETHER]; uint8_t *q = NULL; - uint32_t magicno = 0; uint16_t hl; CSTAT(processlcp); @@ -472,15 +525,17 @@ void processlcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) if (session[s].die) // going down... return; + 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) { int x = l - 4; uint8_t *o = (p + 4); int authtype = 0; - LOG(3, s, t, "LCP: ConfigAck (%d bytes)...\n", l); - if (config->debug > 3) dumplcp(p, l); - while (x > 2) { int type = o[0]; @@ -516,20 +571,20 @@ void processlcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) case AckReceived: case Opened: - LOG(3, s, t, "LCP: ConfigAck in state %s? Sending ConfigReq\n", ppp_state(session[s].ppp.lcp)); + LOG(2, s, t, "LCP: ConfigAck in state %s? Sending ConfigReq\n", ppp_state(session[s].ppp.lcp)); if (session[s].ppp.lcp == Opened) lcp_restart(s); - sendlcp(s, t, sess_local[s].lcp_authtype); + sendlcp(s, t); change_state(s, lcp, RequestSent); break; case AckSent: - lcp_open(t, s); + lcp_open(s, t); break; default: - LOG(3, s, t, "LCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.lcp)); + LOG(2, s, t, "LCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.lcp)); } } else if (*p == ConfigReq) @@ -539,9 +594,7 @@ void processlcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) uint8_t *response = 0; static uint8_t asyncmap[4] = { 0, 0, 0, 0 }; // all zero static uint8_t authproto[5]; - - LOG(3, s, t, "LCP: ConfigReq (%d bytes)...\n", l); - if (config->debug > 3) dumplcp(p, l); + int changed = 0; while (x > 2) { @@ -552,15 +605,27 @@ void processlcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) switch (type) { case 1: // Maximum-Receive-Unit - session[s].mru = ntohs(*(uint16_t *)(o + 2)); + { + uint16_t mru = ntohs(*(uint16_t *)(o + 2)); + if (mru >= MINMTU) + { + session[s].mru = mru; + changed++; + break; + } + + LOG(3, s, t, " Remote requesting MRU of %u. Rejecting.\n", mru); + mru = htons(MRU); + q = ppp_conf_nak(s, b, sizeof(b), PPPLCP, &response, q, p, o, (uint8_t *) &mru, sizeof(mru)); + } break; case 2: // Async-Control-Character-Map if (!ntohl(*(uint32_t *)(o + 2))) // all bits zero is OK break; - LOG(2, s, t, " Remote requesting asyncmap. Rejecting.\n"); - q = ppp_nak(s, b, sizeof(b), PPPLCP, &response, q, p, o, asyncmap, sizeof(asyncmap)); + LOG(3, s, t, " Remote requesting asyncmap. Rejecting.\n"); + q = ppp_conf_nak(s, b, sizeof(b), PPPLCP, &response, q, p, o, asyncmap, sizeof(asyncmap)); break; case 3: // Authentication-Protocol @@ -593,42 +658,100 @@ void processlcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) else sprintf(proto_name, "%#4.4x", proto); - LOG(2, s, t, " Remote requesting %s authentication. Rejecting.\n", proto_name); + LOG(3, s, t, " Remote requesting %s authentication. Rejecting.\n", proto_name); alen = add_lcp_auth(authproto, sizeof(authproto), config->radius_authprefer); if (alen < 2) break; // paranoia - q = ppp_nak(s, b, sizeof(b), PPPLCP, &response, q, p, o, authproto + 2, alen - 2); + q = ppp_conf_nak(s, b, sizeof(b), PPPLCP, &response, q, p, o, authproto + 2, alen - 2); if (q && *response == ConfigNak && config->radius_authtypes != config->radius_authprefer) { // alternate type alen = add_lcp_auth(authproto, sizeof(authproto), config->radius_authtypes & ~config->radius_authprefer); if (alen < 2) break; - q = ppp_nak(s, b, sizeof(b), PPPLCP, &response, q, p, o, authproto + 2, alen - 2); + q = ppp_conf_nak(s, b, sizeof(b), PPPLCP, &response, q, p, o, authproto + 2, alen - 2); } break; } break; - case 5: // Magic-Number - magicno = ntohl(*(uint32_t *)(o + 2)); - break; - case 4: // Quality-Protocol + case 5: // Magic-Number case 7: // Protocol-Field-Compression case 8: // Address-And-Control-Field-Compression break; + case 17: // Multilink Max-Receive-Reconstructed-Unit + { + uint16_t mrru = ntohs(*(uint16_t *)(o + 2)); + session[s].mrru = mrru; + changed++; + LOG(3, s, t, " Received PPP LCP option MRRU: %d\n",mrru); + } + break; + + case 18: // Multilink Short Sequence Number Header Format + { + session[s].mssf = 1; + changed++; + LOG(3, s, t, " Received PPP LCP option MSSN format\n"); + } + break; + + case 19: // Multilink Endpoint Discriminator + { + uint8_t epdis_class = o[2]; + int addr; + + session[s].epdis.addr_class = epdis_class; + session[s].epdis.length = length - 3; + if (session[s].epdis.length > 20) + { + LOG(1, s, t, "Error: received EndDis Address Length more than 20: %d\n", session[s].epdis.length); + session[s].epdis.length = 20; + } + + for (addr = 0; addr < session[s].epdis.length; addr++) + session[s].epdis.address[addr] = o[3+addr]; + + changed++; + + switch (epdis_class) + { + case LOCALADDR: + LOG(3, s, t, " Received PPP LCP option Multilink EndDis Local Address Class: %d\n",epdis_class); + break; + case IPADDR: + LOG(3, s, t, " Received PPP LCP option Multilink EndDis IP Address Class: %d\n",epdis_class); + break; + case IEEEMACADDR: + LOG(3, s, t, " Received PPP LCP option Multilink EndDis IEEE MAC Address Class: %d\n",epdis_class); + break; + case PPPMAGIC: + LOG(3, s, t, " Received PPP LCP option Multilink EndDis PPP Magic No Class: %d\n",epdis_class); + break; + case PSNDN: + LOG(3, s, t, " Received PPP LCP option Multilink EndDis PSND No Class: %d\n",epdis_class); + break; + default: + LOG(3, s, t, " Received PPP LCP option Multilink EndDis NULL Class %d\n",epdis_class); + } + } + break; + default: // Reject any unknown options - LOG(2, s, t, " Rejecting PPP LCP Option type %d\n", type); - q = ppp_rej(s, b, sizeof(b), PPPLCP, &response, q, p, o); + LOG(3, s, t, " Rejecting unknown PPP LCP option %d\n", type); + q = ppp_conf_rej(s, b, sizeof(b), PPPLCP, &response, q, p, o); } x -= length; o += length; } + if (changed) + cluster_send_session(s); + if (response) { l = q - response; // LCP packet length @@ -637,7 +760,7 @@ void processlcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) else { // Send packet back as ConfigAck - response = makeppp(b, sizeof(b), p, l, t, s, PPPLCP); + response = makeppp(b, sizeof(b), p, l, s, t, PPPLCP, 0, 0, 0); if (!response) return; *response = ConfigAck; } @@ -645,7 +768,7 @@ void processlcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) switch (session[s].ppp.lcp) { case Closed: - response = makeppp(b, sizeof(b), p, 2, t, s, PPPLCP); + response = makeppp(b, sizeof(b), p, 2, s, t, PPPLCP, 0, 0, 0); if (!response) return; *response = TerminateAck; *((uint16_t *) (response + 2)) = htons(l = 4); @@ -653,7 +776,7 @@ void processlcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) case Stopped: initialise_restart_count(s, lcp); - sendlcp(s, t, sess_local[s].lcp_authtype); + sendlcp(s, t); if (*response == ConfigAck) change_state(s, lcp, AckSent); else @@ -669,13 +792,13 @@ void processlcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) case AckReceived: if (*response == ConfigAck) - lcp_open(t, s); + lcp_open(s, t); break; case Opened: lcp_restart(s); - sendlcp(s, t, sess_local[s].lcp_authtype); + sendlcp(s, t); /* fallthrough */ case AckSent: @@ -687,22 +810,21 @@ void processlcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) break; default: - LOG(3, s, t, "LCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.lcp)); + LOG(2, s, t, "LCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.lcp)); return; } - LOG(3, s, t, "LCP: Sending %s\n", ppp_code(*response)); + LOG(3, s, t, "LCP: send %s\n", ppp_code(*response)); + if (config->debug > 3) dumplcp(response, l); + tunnelsend(b, l + (response - b), t); } - else if (*p == ConfigNak) + else if (*p == ConfigNak || *p == ConfigRej) { int x = l - 4; uint8_t *o = (p + 4); int authtype = -1; - LOG(3, s, t, "LCP: ConfigNak (%d bytes)...\n", l); - if (config->debug > 3) dumplcp(p, l); - while (x > 2) { int type = o[0]; @@ -712,23 +834,38 @@ void processlcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) switch (type) { case 1: // Maximum-Receive-Unit - session[s].mru = ntohs(*(uint16_t *)(o + 2)); - LOG(3, s, t, " Remote requested MRU of %u\n", session[s].mru); + if (*p == ConfigNak) + { + if (length < 4) break; + 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 + { + sess_local[s].ppp_mru = 0; + LOG(3, s, t, " Remote rejected MRU negotiation\n"); + } + break; case 3: // Authentication-Protocol if (authtype > 0) break; + if (*p == ConfigNak) { - int proto = ntohs(*(uint16_t *)(o + 2)); + int proto; + + if (length < 4) break; + proto = ntohs(*(uint16_t *)(o + 2)); + if (proto == PPPPAP) { authtype = config->radius_authtypes & AUTHPAP; LOG(3, s, t, " Remote requested PAP authentication...%sing\n", authtype ? "accept" : "reject"); } - else if (proto == PPPCHAP && *(o + 4) == 5) + else if (proto == PPPCHAP && length > 4 && *(o + 4) == 5) { authtype = config->radius_authtypes & AUTHCHAP; LOG(3, s, t, " Remote requested CHAP authentication...%sing\n", @@ -740,12 +877,78 @@ void processlcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) proto); } } + else + { + LOG(2, s, t, "LCP: remote rejected auth negotiation\n"); + authtype = 0; // shutdown + } break; - default: - LOG(2, s, t, " Remote NAKed LCP type %u?\n", type); + case 5: // Magic-Number + session[s].magic = 0; + if (*p == ConfigNak) + { + if (length < 6) break; + session[s].magic = ntohl(*(uint32_t *)(o + 2)); + } + + if (session[s].magic) + LOG(3, s, t, " Remote requested magic-no %x\n", session[s].magic); + else + LOG(3, s, t, " Remote rejected magic-no\n"); + + cluster_send_session(s); break; + + case 17: // Multilink Max-Receive-Reconstructed-Unit + { + if (*p == ConfigNak) + { + sess_local[s].mp_mrru = ntohs(*(uint16_t *)(o + 2)); + LOG(3, s, t, " Remote requested MRRU of %u\n", sess_local[s].mp_mrru); + } + else + { + sess_local[s].mp_mrru = 0; + LOG(3, s, t, " Remote rejected MRRU negotiation\n"); + } + } + break; + + case 18: // Multilink Short Sequence Number Header Format + { + if (*p == ConfigNak) + { + sess_local[s].mp_mssf = 0; + LOG(3, s, t, " Remote requested Naked mssf\n"); + } + else + { + sess_local[s].mp_mssf = 0; + LOG(3, s, t, " Remote rejected mssf\n"); + } + } + break; + + case 19: // Multilink Endpoint Discriminator + { + if (*p == ConfigNak) + { + LOG(2, s, t, " Remote should not configNak Endpoint Dis!\n"); + } + else + { + sess_local[s].mp_epdis = 0; + LOG(3, s, t, " Remote rejected Endpoint Discriminator\n"); + } + } + break; + + default: + LOG(2, s, t, "LCP: remote sent %s for type %u?\n", ppp_code(*p), type); + sessionshutdown(s, "Unable to negotiate LCP.", CDN_ADMIN_DISC, TERM_USER_ERROR); + return; } x -= length; o += length; @@ -753,7 +956,7 @@ void processlcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) if (!authtype) { - sessionshutdown(s, "Unsupported authentication.", 3, 0); + sessionshutdown(s, "Unsupported authentication.", CDN_ADMIN_DISC, TERM_USER_ERROR); return; } @@ -765,10 +968,14 @@ void processlcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) case Closed: case Stopped: { - uint8_t *response = makeppp(b, sizeof(b), p, 2, t, s, PPPLCP); + uint8_t *response = makeppp(b, sizeof(b), p, 2, s, t, PPPLCP, 0, 0, 0); if (!response) return; *response = TerminateAck; *((uint16_t *) (response + 2)) = htons(l = 4); + + LOG(3, s, t, "LCP: send %s\n", ppp_code(*response)); + if (config->debug > 3) dumplcp(response, l); + tunnelsend(b, l + (response - b), t); } break; @@ -776,114 +983,228 @@ void processlcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) case RequestSent: case AckSent: initialise_restart_count(s, lcp); - sendlcp(s, t, sess_local[s].lcp_authtype); + sendlcp(s, t); break; case AckReceived: - LOG(3, s, t, "LCP: ConfigNak in state %s? Sending ConfigReq\n", ppp_state(session[s].ppp.lcp)); - sendlcp(s, t, sess_local[s].lcp_authtype); + LOG(2, s, t, "LCP: ConfigNak in state %s? Sending ConfigReq\n", ppp_state(session[s].ppp.lcp)); + sendlcp(s, t); break; case Opened: lcp_restart(s); - sendlcp(s, t, sess_local[s].lcp_authtype); + sendlcp(s, t); break; default: - LOG(3, s, t, "LCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.lcp)); + LOG(2, s, t, "LCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.lcp)); return; } } else if (*p == TerminateReq) { - LOG(3, s, t, "LCP: Received TerminateReq. Sending TerminateAck\n"); - *p = TerminateAck; // close - q = makeppp(b, sizeof(b), p, l, t, s, PPPLCP); + switch (session[s].ppp.lcp) + { + case Closed: + case Stopped: + case Closing: + case Stopping: + case RequestSent: + case AckReceived: + case AckSent: + break; + + case Opened: + lcp_restart(s); + zero_restart_count(s, lcp); + change_state(s, lcp, Closing); + break; + + default: + LOG(2, s, t, "LCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.lcp)); + return; + } + + *p = TerminateAck; // send ack + q = makeppp(b, sizeof(b), p, l, s, t, PPPLCP, 0, 0, 0); if (!q) return; + + LOG(3, s, t, "LCP: send %s\n", ppp_code(*q)); + if (config->debug > 3) dumplcp(q, l); + tunnelsend(b, l + (q - b), t); // send it - sessionshutdown(s, "Remote end closed connection.", 3, 0); - } - else if (*p == TerminateAck) - { - sessionshutdown(s, "Connection closed.", 3, 0); } else if (*p == ProtocolRej) { - if (*(uint16_t *) (p+4) == htons(PPPIPV6CP)) + uint16_t proto = 0; + + if (l > 4) + { + proto = *(p+4); + if (l > 5 && !(proto & 1)) + { + proto <<= 8; + proto |= *(p+5); + } + } + + if (proto == PPPIPV6CP) { LOG(3, s, t, "IPv6 rejected\n"); change_state(s, ipv6cp, Closed); } else { - LOG(1, s, t, "Unexpected LCP protocol reject 0x%X\n", - ntohs(*(uint16_t *) (p+4))); - STAT(tunnel_rx_errors); + LOG(3, s, t, "LCP protocol reject: 0x%04X\n", proto); } } else if (*p == EchoReq) { - LOG(5, s, t, "LCP: Received EchoReq. Sending EchoReply\n"); *p = EchoReply; // reply *(uint32_t *) (p + 4) = htonl(session[s].magic); // our magic number - q = makeppp(b, sizeof(b), p, l, t, s, PPPLCP); + q = makeppp(b, sizeof(b), p, l, s, t, PPPLCP, 0, 0, 0); if (!q) return; + + LOG(4, s, t, "LCP: send %s\n", ppp_code(*q)); + if (config->debug > 3) dumplcp(q, l); + tunnelsend(b, l + (q - b), t); // send it } else if (*p == EchoReply) { // Ignore it, last_packet time is set earlier than this. } - else + else if (*p != CodeRej) { - int code = *p; - int mru = session[s].mru; - if (!mru) - mru = DEFAULT_MRU; + ppp_code_rej(s, t, PPPLCP, "LCP", p, l, b, sizeof(b)); + } +} - if (l > mru) l = mru; +int join_bundle(sessionidt s) +{ + // Search for a bundle to join + bundleidt i; + bundleidt b; + for (i = 1; i < MAXBUNDLE; i++) + { + if (bundle[i].state != BUNDLEFREE) + { + if (epdiscmp(session[s].epdis,bundle[i].epdis) && !strcmp(session[s].user, bundle[i].user)) + { + session[s].bundle = i; + bundle[i].mrru = session[s].mrru; + bundle[i].mssf = session[s].mssf; + if (session[s].epdis.length > 0) + setepdis(&bundle[i].epdis, session[s].epdis); + + strcpy(bundle[i].user, session[s].user); + bundle[i].members[bundle[i].num_of_links] = s; + bundle[i].num_of_links++; + LOG(3, s, session[s].tunnel, "MPPP: Bundling additional line in bundle (%d), lines:%d\n",i,bundle[i].num_of_links); + return i; + } + } + } - *p = CodeRej; - q = makeppp(b, sizeof(b), p, l, t, s, PPPLCP); - if (!q) return; + // No previously created bundle was found for this session, so create a new one + if (!(b = new_bundle())) return 0; - LOG(3, s, t, "Unexpected LCP code %s\n", ppp_code(code)); - tunnelsend(b, l + (q - b), t); + session[s].bundle = b; + bundle[b].mrru = session[s].mrru; + bundle[b].mssf = session[s].mssf; + if (session[s].epdis.length > 0) + setepdis(&bundle[b].epdis, session[s].epdis); + + strcpy(bundle[b].user, session[s].user); + bundle[b].members[0] = s; + LOG(3, s, session[s].tunnel, "MPPP: Created a new bundle (%d)\n", b); + return b; +} + +static int epdiscmp(epdist ep1, epdist ep2) +{ + int ad; + if (ep1.length != ep2.length) + return 0; + + if (ep1.addr_class != ep2.addr_class) + return 0; + + for (ad = 0; ad < ep1.length; ad++) + if (ep1.address[ad] != ep2.address[ad]) + return 0; + + return 1; +} + +static void setepdis(epdist *ep1, epdist ep2) +{ + int ad; + ep1->length = ep2.length; + ep1->addr_class = ep2.addr_class; + for (ad = 0; ad < ep2.length; ad++) + ep1->address[ad] = ep2.address[ad]; +} + +static bundleidt new_bundle() +{ + bundleidt i; + for (i = 1; i < MAXBUNDLE; i++) + { + if (bundle[i].state == BUNDLEFREE) + { + LOG(4, 0, 0, "MPPP: Assigning bundle ID %d\n", i); + bundle[i].num_of_links = 1; + bundle[i].last_check = time_now; // Initialize last_check value + bundle[i].state = BUNDLEOPEN; + bundle[i].current_ses = -1; // This is to enforce the first session 0 to be used at first + if (i > config->cluster_highest_bundleid) + config->cluster_highest_bundleid = i; + return i; + } } + LOG(0, 0, 0, "MPPP: Can't find a free bundle! There shouldn't be this many in use!\n"); + return 0; } -static void ipcp_open(tunnelidt t, sessionidt s) +static void ipcp_open(sessionidt s, tunnelidt t) { - LOG(3, s, t, "IPCP Acked, session is now active\n"); + LOG(3, s, t, "IPCP: Opened, session is now active\n"); 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 if (session[s].ppp.ipv6cp == Stopped) { - sendipv6cp(t, s); + sendipv6cp(s, t); change_state(s, ipv6cp, RequestSent); } } // Process IPCP messages -void processipcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) +void processipcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) { - uint8_t b[MAXCONTROL]; + uint8_t b[MAXETHER]; uint8_t *q = 0; uint16_t hl; CSTAT(processipcp); LOG_HEX(5, "IPCP", p, l); - if (l < 5) + if (l < 4) { LOG(1, s, t, "Short IPCP %d bytes\n", l); STAT(tunnel_rx_errors); @@ -904,6 +1225,8 @@ void processipcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) return; } + LOG(3, s, t, "IPCP: recv %s\n", ppp_code(*p)); + if (*p == ConfigAck) { switch (session[s].ppp.ipcp) @@ -915,17 +1238,17 @@ void processipcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) case AckReceived: case Opened: - LOG(3, s, t, "IPCP: ConfigAck in state %s? Sending ConfigReq\n", ppp_state(session[s].ppp.ipcp)); + LOG(2, s, t, "IPCP: ConfigAck in state %s? Sending ConfigReq\n", ppp_state(session[s].ppp.ipcp)); sendipcp(s, t); change_state(s, ipcp, RequestSent); break; case AckSent: - ipcp_open(t, s); + ipcp_open(s, t); break; default: - LOG(3, s, t, "IPCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ipcp)); + LOG(2, s, t, "IPCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ipcp)); } } else if (*p == ConfigReq) @@ -936,23 +1259,24 @@ void processipcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) int gotip = 0; in_addr_t addr; - LOG(4, s, t, "IPCP ConfigReq received\n"); - while (length > 2) { + if (!o[1] || o[1] > length) return; + switch (*o) { case 3: // ip address gotip++; // seen address - if (o[1] != 6 || o[1] > length) return; + if (o[1] != 6) return; addr = htonl(session[s].ip); if (memcmp(o + 2, &addr, (sizeof addr))) { - q = ppp_nak(s, b, sizeof(b), PPPIPCP, &response, q, p, o, (uint8_t *) &addr, sizeof(addr)); - if (!q || *response == ConfigRej) + uint8_t *oq = q; + q = ppp_conf_nak(s, b, sizeof(b), PPPIPCP, &response, q, p, o, (uint8_t *) &addr, sizeof(addr)); + if (!q || (q != oq && *response == ConfigRej)) { - sessionshutdown(s, "Can't negotiate IPCP.", 3, 0); + sessionshutdown(s, "Can't negotiate IPCP.", CDN_ADMIN_DISC, TERM_USER_ERROR); return; } } @@ -960,24 +1284,24 @@ void processipcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) break; case 129: // primary DNS - if (o[1] != 6 || o[1] > length) return; + if (o[1] != 6) return; addr = htonl(session[s].dns1); if (memcmp(o + 2, &addr, (sizeof addr))) { - q = ppp_nak(s, b, sizeof(b), PPPIPCP, &response, q, p, o, (uint8_t *) &addr, sizeof(addr)); + q = ppp_conf_nak(s, b, sizeof(b), PPPIPCP, &response, q, p, o, (uint8_t *) &addr, sizeof(addr)); if (!q) return; } break; case 131: // secondary DNS - if (o[1] != 6 || o[1] > length) return; + if (o[1] != 6) return; - addr = htonl(session[s].dns1); + addr = htonl(session[s].dns2); if (memcmp(o + 2, &addr, sizeof(addr))) { - q = ppp_nak(s, b, sizeof(b), PPPIPCP, &response, q, p, o, (uint8_t *) &addr, sizeof(addr)); + q = ppp_conf_nak(s, b, sizeof(b), PPPIPCP, &response, q, p, o, (uint8_t *) &addr, sizeof(addr)); if (!q) return; } @@ -985,7 +1309,7 @@ void processipcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) default: LOG(2, s, t, " Rejecting PPP IPCP Option type %d\n", *o); - q = ppp_rej(s, b, sizeof(b), PPPIPCP, &response, q, p, o); + q = ppp_conf_rej(s, b, sizeof(b), PPPIPCP, &response, q, p, o); if (!q) return; } @@ -1001,7 +1325,7 @@ void processipcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) else if (gotip) { // Send packet back as ConfigAck - response = makeppp(b, sizeof(b), p, l, t, s, PPPIPCP); + response = makeppp(b, sizeof(b), p, l, s, t, PPPIPCP, 0, 0, 0); if (!response) return; *response = ConfigAck; } @@ -1015,7 +1339,7 @@ void processipcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) switch (session[s].ppp.ipcp) { case Closed: - response = makeppp(b, sizeof(b), p, 2, t, s, PPPIPCP); + response = makeppp(b, sizeof(b), p, 2, s, t, PPPIPCP, 0, 0, 0); if (!response) return; *response = TerminateAck; *((uint16_t *) (response + 2)) = htons(l = 4); @@ -1039,7 +1363,7 @@ void processipcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) case AckReceived: if (*response == ConfigAck) - ipcp_open(t, s); + ipcp_open(s, t); break; @@ -1057,56 +1381,65 @@ void processipcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) break; default: - LOG(3, s, t, "IPCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ipcp)); + LOG(2, s, t, "IPCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ipcp)); return; } - LOG(3, s, t, "IPCP: Sending %s\n", ppp_code(*response)); + LOG(3, s, t, "IPCP: send %s\n", ppp_code(*response)); tunnelsend(b, l + (response - b), t); } else if (*p == TerminateReq) { - LOG(3, s, t, "IPCP: Received TerminateReq. Sending TerminateAck\n"); - *p = TerminateAck; - q = makeppp(b, sizeof(b), p, l, t, s, PPPIPCP); - if (!q) return; - tunnelsend(b, l + (q - b), t); - change_state(s, ipcp, Stopped); - } - else - { - int code = *p; - int mru = session[s].mru; - if (!mru) - mru = DEFAULT_MRU; + switch (session[s].ppp.ipcp) + { + case Closed: + case Stopped: + case Closing: + case Stopping: + case RequestSent: + case AckReceived: + case AckSent: + break; - if (l > mru) l = mru; + case Opened: + zero_restart_count(s, ipcp); + change_state(s, ipcp, Closing); + break; + + default: + LOG(2, s, t, "IPCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ipcp)); + return; + } - *p = CodeRej; - q = makeppp(b, sizeof(b), p, l, t, s, PPPIPCP); + *p = TerminateAck; // send ack + q = makeppp(b, sizeof(b), p, l, s, t, PPPIPCP, 0, 0, 0); if (!q) return; - LOG(3, s, t, "Unexpected IPCP code %s\n", ppp_code(code)); - tunnelsend(b, l + (q - b), t); + LOG(3, s, t, "IPCP: send %s\n", ppp_code(*q)); + tunnelsend(b, l + (q - b), t); // send it + } + else if (*p != CodeRej) + { + ppp_code_rej(s, t, PPPIPCP, "IPCP", p, l, b, sizeof(b)); } } -static void ipv6cp_open(tunnelidt t, sessionidt s) +static void ipv6cp_open(sessionidt s, tunnelidt t) { - LOG(3, s, t, "IPV6CP Acked\n"); + LOG(3, s, t, "IPV6CP: Opened\n"); change_state(s, ipv6cp, Opened); if (session[s].ipv6prefixlen) route6set(s, session[s].ipv6route, session[s].ipv6prefixlen, 1); // Send an initial RA (TODO: Should we send these regularly?) - send_ipv6_ra(t, s, NULL); + send_ipv6_ra(s, t, NULL); } // Process IPV6CP messages -void processipv6cp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) +void processipv6cp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) { - uint8_t b[MAXCONTROL]; + uint8_t b[MAXETHER]; uint8_t *q = 0; uint16_t hl; @@ -1134,15 +1467,7 @@ void processipv6cp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) return; } - if (!config->ipv6_prefix.s6_addr[0]) - { - LOG(2, s, t, "IPV6CP %s rejected (not configured)\n", ppp_code(*p)); - *p = ProtocolRej; - q = makeppp(b, sizeof(b), p, l, t, s, PPPIPV6CP); - if (!q) return; - tunnelsend(b, l + (q - b), t); - return; - } + LOG(3, s, t, "IPV6CP: recv %s\n", ppp_code(*p)); if (!session[s].ip) { @@ -1161,17 +1486,17 @@ void processipv6cp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) case AckReceived: case Opened: - LOG(3, s, t, "IPV6CP: ConfigAck in state %s? Sending ConfigReq\n", ppp_state(session[s].ppp.ipv6cp)); + LOG(2, s, t, "IPV6CP: ConfigAck in state %s? Sending ConfigReq\n", ppp_state(session[s].ppp.ipv6cp)); sendipv6cp(s, t); change_state(s, ipv6cp, RequestSent); break; case AckSent: - ipv6cp_open(t, s); + ipv6cp_open(s, t); break; default: - LOG(3, s, t, "IPV6CP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ipv6cp)); + LOG(2, s, t, "IPV6CP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ipv6cp)); } } else if (*p == ConfigReq) @@ -1182,22 +1507,22 @@ void processipv6cp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) int gotip = 0; uint8_t ident[8]; - LOG(4, s, t, "IPV6CP ConfigReq received\n"); - while (length > 2) { + if (!o[1] || o[1] > length) return; + switch (*o) { case 1: // interface identifier gotip++; // seen address - if (o[1] != 10 || o[1] > length) return; + if (o[1] != 10) return; *(uint32_t *) ident = htonl(session[s].ip); *(uint32_t *) (ident + 4) = 0; if (memcmp(o + 2, ident, sizeof(ident))) { - q = ppp_nak(s, b, sizeof(b), PPPIPV6CP, &response, q, p, o, ident, sizeof(ident)); + q = ppp_conf_nak(s, b, sizeof(b), PPPIPV6CP, &response, q, p, o, ident, sizeof(ident)); if (!q) return; } @@ -1205,7 +1530,7 @@ void processipv6cp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) default: LOG(2, s, t, " Rejecting PPP IPV6CP Option type %d\n", *o); - q = ppp_rej(s, b, sizeof(b), PPPIPV6CP, &response, q, p, o); + q = ppp_conf_rej(s, b, sizeof(b), PPPIPV6CP, &response, q, p, o); if (!q) return; } @@ -1221,7 +1546,7 @@ void processipv6cp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) else if (gotip) { // Send packet back as ConfigAck - response = makeppp(b, sizeof(b), p, l, t, s, PPPIPV6CP); + response = makeppp(b, sizeof(b), p, l, s, t, PPPIPV6CP, 0, 0, 0); if (!response) return; *response = ConfigAck; } @@ -1235,7 +1560,7 @@ void processipv6cp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) switch (session[s].ppp.ipv6cp) { case Closed: - response = makeppp(b, sizeof(b), p, 2, t, s, 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); @@ -1259,7 +1584,7 @@ void processipv6cp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) case AckReceived: if (*response == ConfigAck) - ipv6cp_open(t, s); + ipv6cp_open(s, t); break; @@ -1277,37 +1602,46 @@ void processipv6cp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) break; default: - LOG(3, s, t, "IPV6CP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ipv6cp)); + LOG(2, s, t, "IPV6CP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ipv6cp)); return; } - LOG(3, s, t, "IPV6CP: Sending %s\n", ppp_code(*response)); + LOG(3, s, t, "IPV6CP: send %s\n", ppp_code(*response)); tunnelsend(b, l + (response - b), t); } else if (*p == TerminateReq) { - LOG(3, s, t, "IPV6CP: Received TerminateReq. Sending TerminateAck\n"); - *p = TerminateAck; - q = makeppp(b, sizeof(b), p, l, t, s, PPPIPV6CP); - if (!q) return; - tunnelsend(b, l + (q - b), t); - change_state(s, ipv6cp, Stopped); - } - else - { - int code = *p; - int mru = session[s].mru; - if (!mru) - mru = DEFAULT_MRU; + switch (session[s].ppp.ipv6cp) + { + case Closed: + case Stopped: + case Closing: + case Stopping: + case RequestSent: + case AckReceived: + case AckSent: + break; + + case Opened: + zero_restart_count(s, ipv6cp); + change_state(s, ipv6cp, Closing); + break; - if (l > mru) l = mru; + default: + LOG(2, s, t, "IPV6CP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ipv6cp)); + return; + } - *p = CodeRej; - q = makeppp(b, sizeof(b), p, l, t, s, PPPIPV6CP); + *p = TerminateAck; // send ack + q = makeppp(b, sizeof(b), p, l, s, t, PPPIPV6CP, 0, 0, 0); if (!q) return; - LOG(3, s, t, "Unexpected IPV6CP code %s\n", ppp_code(code)); - tunnelsend(b, l + (q - b), t); + LOG(3, s, t, "IPV6CP: send %s\n", ppp_code(*q)); + tunnelsend(b, l + (q - b), t); // send it + } + else if (*p != CodeRej) + { + ppp_code_rej(s, t, PPPIPV6CP, "IPV6CP", p, l, b, sizeof(b)); } } @@ -1315,7 +1649,7 @@ void processipv6cp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) // // This MUST be called with at least 4 byte behind 'p'. // (i.e. this routine writes to p[-4]). -void processipin(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) +void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) { in_addr_t ip; @@ -1323,6 +1657,13 @@ void processipin(tunnelidt t, sessionidt s, 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) @@ -1335,17 +1676,28 @@ void processipin(tunnelidt t, sessionidt s, 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 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); @@ -1397,11 +1749,172 @@ void processipin(tunnelidt t, sessionidt s, 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'. // (i.e. this routine writes to p[-4]). -void processipv6in(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) +void processipv6in(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) { struct in6_addr ip; in_addr_t ipv4; @@ -1438,7 +1951,7 @@ void processipv6in(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) *(uint32_t *)(p + 34) == 0 && *(p + 38) == 0 && *(p + 39) == 2 && *(p + 40) == 133) { LOG(3, s, t, "Got IPv6 RS\n"); - send_ipv6_ra(t, s, &ip); + send_ipv6_ra(s, t, &ip); return; } @@ -1535,9 +2048,9 @@ void send_ipin(sessionidt s, uint8_t *buf, int len) // Process CCP messages -void processccp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) +void processccp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) { - uint8_t b[MAXCONTROL]; + uint8_t b[MAXETHER]; uint8_t *q; CSTAT(processccp); @@ -1556,6 +2069,7 @@ void processccp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) STAT(tunnel_rx_errors); } + LOG(4, s, t, "CCP: recv %s\n", ppp_code(*p)); if (*p == ConfigAck) { switch (session[s].ppp.ccp) @@ -1567,18 +2081,18 @@ void processccp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) case AckReceived: case Opened: - LOG(3, s, t, "CCP: ConfigAck in state %s? Sending ConfigReq\n", ppp_state(session[s].ppp.ccp)); + LOG(2, s, t, "CCP: ConfigAck in state %s? Sending ConfigReq\n", ppp_state(session[s].ppp.ccp)); sendccp(s, t); change_state(s, ccp, RequestSent); break; case AckSent: - LOG(3, s, t, "CCP Acked\n"); + LOG(3, s, t, "CCP: Opened\n"); change_state(s, ccp, Opened); break; default: - LOG(3, s, t, "CCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ccp)); + LOG(2, s, t, "CCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ccp)); } } else if (*p == ConfigReq) @@ -1588,13 +2102,13 @@ void processccp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) else // compression requested--reject *p = ConfigRej; - q = makeppp(b, sizeof(b), p, l, t, s, 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, t, s, 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); @@ -1636,49 +2150,38 @@ void processccp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) break; default: - LOG(3, s, t, "CCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ccp)); + LOG(2, s, t, "CCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ccp)); return; } - LOG(3, s, t, "CCP: Sending %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) { - LOG(3, s, t, "CCP: Received TerminateReq. Sending TerminateAck\n"); *p = TerminateAck; - q = makeppp(b, sizeof(b), p, l, t, s, 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); change_state(s, ccp, Stopped); } - else + else if (*p != CodeRej) { - int code = *p; - int mru = session[s].mru; - if (!mru) - mru = DEFAULT_MRU; - - if (l > mru) l = mru; - - *p = CodeRej; - q = makeppp(b, sizeof(b), p, l, t, s, PPPCCP); - if (!q) return; - - LOG(3, s, t, "Unexpected CCP code %s\n", ppp_code(code)); - tunnelsend(b, l + (q - b), t); + ppp_code_rej(s, t, PPPCCP, "CCP", p, l, b, sizeof(b)); } } // send a CHAP challenge -void sendchap(tunnelidt t, sessionidt s) +void sendchap(sessionidt s, tunnelidt t) { - uint8_t b[MAXCONTROL]; - uint16_t r = sess_local[s].radius; + uint8_t b[MAXETHER]; + uint16_t r; uint8_t *q; CSTAT(sendchap); + r = radiusnew(s); if (!r) { LOG(1, s, t, "No RADIUS to send challenge\n"); @@ -1697,11 +2200,11 @@ void sendchap(tunnelidt t, sessionidt s) radius[r].retry = backoff(radius[r].try++); if (radius[r].try > 5) { - sessionshutdown(s, "CHAP timeout.", 3, 0); + sessionshutdown(s, "CHAP timeout.", CDN_ADMIN_DISC, TERM_REAUTHENTICATION_FAILURE); STAT(tunnel_tx_errors); return ; } - q = makeppp(b, sizeof(b), 0, 0, t, s, PPPCHAP); + q = makeppp(b, sizeof(b), 0, 0, s, t, PPPCHAP, 0, 0, 0); if (!q) return; *q = 1; // challenge @@ -1714,43 +2217,87 @@ void sendchap(tunnelidt t, sessionidt s) } // fill in a L2TP message with a PPP frame, -// copies existing PPP message and changes magic number if seen // returns start of PPP frame -uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, tunnelidt t, sessionidt s, 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!! { - 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; } - *(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].l2tp_flags & SESSIONACFC)) + + // 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].l2tp_flags & SESSIONPFC) - *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) { - 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) + // 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); @@ -1783,56 +2330,110 @@ static int add_lcp_auth(uint8_t *b, int size, int authtype) return len; } -// Send initial LCP ConfigReq for MRU, authentication type and magic no -void sendlcp(tunnelidt t, sessionidt s, int authtype) +// Send LCP ConfigReq for MRU, authentication type and magic no +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, t, s, PPPLCP))) + if (!(q = makeppp(b, sizeof(b), NULL, 0, s, t, PPPLCP, 0, 0, 0))) return; - LOG(4, s, t, "Sending LCP ConfigReq%s%s\n", - authtype ? " for " : "", - authtype ? (authtype == AUTHCHAP ? "CHAP" : "PAP") : ""); - - if (!session[s].mru) - session[s].mru = DEFAULT_MRU; + LOG(3, s, t, "LCP: send ConfigReq%s%s%s including MP options\n", + authtype ? " (" : "", + authtype ? (authtype == AUTHCHAP ? "CHAP" : "PAP") : "", + authtype ? ")" : ""); l = q; *l++ = ConfigReq; - *l++ = (time_now % 255) + 1; // ID + *l++ = ++sess_local[s].lcp_ident; // ID l += 2; //Save space for length - *l++ = 1; *l++ = 4; // Maximum-Receive-Unit (length 4) - *(uint16_t *) l = htons(session[s].mru); l += 2; + if (sess_local[s].ppp_mru) + { + *l++ = 1; *l++ = 4; // Maximum-Receive-Unit (length 4) + *(uint16_t *) l = htons(sess_local[s].ppp_mru); l += 2; + } if (authtype) l += add_lcp_auth(l, sizeof(b) - (l - b), authtype); - *l++ = 5; *l++ = 6; // Magic-Number (length 6) - *(uint32_t *) l = htonl(session[s].magic); - l += 4; + if (session[s].magic) + { + *l++ = 5; *l++ = 6; // Magic-Number (length 6) + *(uint32_t *) l = htonl(session[s].magic); + 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); + if (config->debug > 3) dumplcp(q, l - q); + tunnelsend(b, (l - b), t); + restart_timer(s, lcp); } // Send CCP request for no compression -void sendccp(tunnelidt t, sessionidt s) +void sendccp(sessionidt s, tunnelidt t) { uint8_t b[500], *q; - if (!(q = makeppp(b, sizeof(b), NULL, 0, t, s, PPPCCP))) + if (!(q = makeppp(b, sizeof(b), NULL, 0, s, t, PPPCCP, 0, 0, 0))) return; - LOG(4, s, t, "Sending CCP ConfigReq for no compression\n"); + LOG(3, s, t, "CCP: send ConfigReq (no compression)\n"); + *q = ConfigReq; - *(uint8_t *)(q + 1) = (time_now % 255) + 1; // ID + *(q + 1) = ++sess_local[s].lcp_ident; // ID *(uint16_t *)(q + 2) = htons(4); // Length 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, 0, 0, 0); + 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); }