X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/811379c1a6bed85a984578256646e70a9f203b57..464d19fbb248153d34982f52692a0bd11a825d1d:/ppp.c?ds=sidebyside diff --git a/ppp.c b/ppp.c index b954e32..fd89d91 100644 --- a/ppp.c +++ b/ppp.c @@ -1,6 +1,6 @@ // L2TPNS PPP Stuff -char const *cvs_id_ppp = "$Id: ppp.c,v 1.46 2005/03/10 06:16:05 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 1.46 2005/03/10 06:16:05 bodea Exp $"; #include "cluster.h" extern tunnelt *tunnel; +extern bundlet *bundle; +extern fragmentationt *frag; extern sessiont *session; extern radiust *radius; extern int tunfd; @@ -23,14 +25,19 @@ extern uint32_t eth_tx; extern time_t time_now; extern configt *config; -static void initccp(tunnelidt t, sessionidt s); +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]; uint16_t hl; + uint16_t r; CSTAT(processpap); @@ -39,14 +46,16 @@ 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); - return ; + sessionshutdown(s, "Short PAP packet.", CDN_ADMIN_DISC, TERM_USER_ERROR); + return; } if ((hl = ntohs(*(uint16_t *) (p + 2))) > l) { LOG(1, s, t, "Length mismatch PAP %u/%u\n", hl, l); STAT(tunnel_rx_errors); - return ; + sessionshutdown(s, "PAP length mismatch.", CDN_ADMIN_DISC, TERM_USER_ERROR); + return; } l = hl; @@ -54,7 +63,14 @@ 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); - return ; + sessionshutdown(s, "Unexpected PAP code.", CDN_ADMIN_DISC, TERM_USER_ERROR); + return; + } + + if (session[s].ppp.phase != Authenticate) + { + LOG(2, s, t, "PAP ignored in %s phase\n", ppp_phase(session[s].ppp.phase)); + return; } { @@ -74,12 +90,13 @@ void processpap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) } LOG(3, s, t, "PAP login %s/%s\n", user, pass); } - if (session[s].ip || !session[s].radius) + + 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) @@ -89,25 +106,21 @@ void processpap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) p[1] = id; *(uint16_t *) (p + 2) = htons(5); // length p[4] = 0; // no message + tunnelsend(b, 5 + (p - b), t); // send it + if (session[s].ip) { LOG(3, s, t, "Already an IP allocated: %s (%d)\n", fmtaddr(htonl(session[s].ip), 0), session[s].ip_pool_index); - - session[s].flags &= ~SF_IPCP_ACKED; } else { - LOG(1, s, t, "No radius session available to authenticate session...\n"); + LOG(1, s, t, "No RADIUS session available to authenticate session...\n"); + sessionshutdown(s, "No free RADIUS sessions.", CDN_UNAVAILABLE, TERM_SERVICE_UNAVAILABLE); } - LOG(3, s, t, "Fallback response to PAP (%s)\n", (session[s].ip) ? "ACK" : "NAK"); - tunnelsend(b, 5 + (p - b), t); // send it } else { - // set up RADIUS request - uint16_t r = session[s].radius; - // Run PRE_AUTH plugins struct param_pre_auth packet = { &tunnel[t], &session[s], strdup(user), strdup(pass), PPPPAP, 1 }; run_plugins(PLUGIN_PRE_AUTH, &packet); @@ -126,13 +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; @@ -140,26 +153,21 @@ void processchap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) CSTAT(processchap); LOG_HEX(5, "CHAP", p, l); - r = session[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); - return ; + sessionshutdown(s, "Short CHAP packet.", CDN_ADMIN_DISC, TERM_USER_ERROR); + return; } if ((hl = ntohs(*(uint16_t *) (p + 2))) > l) { LOG(1, s, t, "Length mismatch CHAP %u/%u\n", hl, l); STAT(tunnel_rx_errors); - return ; + sessionshutdown(s, "CHAP length mismatch.", CDN_ADMIN_DISC, TERM_USER_ERROR); + return; } l = hl; @@ -167,20 +175,45 @@ 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.", CDN_ADMIN_DISC, TERM_USER_ERROR); + return; + } + + if (session[s].ppp.phase != Authenticate) + { + LOG(2, s, t, "CHAP ignored in %s phase\n", ppp_phase(session[s].ppp.phase)); + 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); - return ; + sessionshutdown(s, "Unexpected CHAP response ID.", CDN_ADMIN_DISC, TERM_USER_ERROR); + return; } if (l < 5 || p[4] != 16) { LOG(1, s, t, "Bad CHAP response length %d\n", l < 5 ? -1 : p[4]); STAT(tunnel_rx_errors); - return ; + sessionshutdown(s, "Bad CHAP response length.", CDN_ADMIN_DISC, TERM_USER_ERROR); + return; } l -= 5; @@ -189,7 +222,8 @@ 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); - return ; + sessionshutdown(s, "CHAP username too long.", CDN_ADMIN_DISC, TERM_USER_ERROR); + return; } // Run PRE_AUTH plugins @@ -232,7 +266,7 @@ static void dumplcp(uint8_t *p, int l) uint8_t *o = (p + 4); LOG_HEX(5, "PPP LCP Packet", p, l); - LOG(4, 0, 0, "PPP LCP Packet type %d (%s len %d)\n", *p, ppp_lcp_type((int)*p), ntohs( ((uint16_t *) p)[1]) ); + LOG(4, 0, 0, "PPP LCP Packet type %d (%s len %d)\n", *p, ppp_code((int)*p), ntohs( ((uint16_t *) p)[1]) ); LOG(4, 0, 0, "Length: %d\n", l); if (*p != ConfigReq && *p != ConfigRej && *p != ConfigAck) return; @@ -257,48 +291,54 @@ static void dumplcp(uint8_t *p, int l) { case 1: // Maximum-Receive-Unit if (length == 4) - LOG(4, 0, 0, " %s %d\n", lcp_type(type), ntohs(*(uint16_t *)(o + 2))); + LOG(4, 0, 0, " %s %d\n", ppp_lcp_option(type), ntohs(*(uint16_t *)(o + 2))); else - LOG(4, 0, 0, " %s odd length %d\n", lcp_type(type), length); + LOG(4, 0, 0, " %s odd length %d\n", ppp_lcp_option(type), length); break; case 2: // Async-Control-Character-Map if (length == 6) { uint32_t asyncmap = ntohl(*(uint32_t *)(o + 2)); - LOG(4, 0, 0, " %s %x\n", lcp_type(type), asyncmap); + LOG(4, 0, 0, " %s %x\n", ppp_lcp_option(type), asyncmap); } else - LOG(4, 0, 0, " %s odd length %d\n", lcp_type(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", lcp_type(type), proto, - proto == PPPCHAP ? "CHAP" : - proto == PPPPAP ? "PAP" : "UNKNOWN"); + 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 = *(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", lcp_type(type), length); + LOG(4, 0, 0, " %s odd length %d\n", ppp_lcp_option(type), length); break; case 4: // Quality-Protocol { uint32_t qp = ntohl(*(uint32_t *)(o + 2)); - LOG(4, 0, 0, " %s %x\n", lcp_type(type), qp); + LOG(4, 0, 0, " %s %x\n", ppp_lcp_option(type), qp); } break; case 5: // Magic-Number if (length == 6) { uint32_t magicno = ntohl(*(uint32_t *)(o + 2)); - LOG(4, 0, 0, " %s %x\n", lcp_type(type), magicno); + LOG(4, 0, 0, " %s %x\n", ppp_lcp_option(type), magicno); } else - LOG(4, 0, 0, " %s odd length %d\n", lcp_type(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 - LOG(4, 0, 0, " %s\n", lcp_type(type)); + LOG(4, 0, 0, " %s\n", ppp_lcp_option(type)); break; default: LOG(2, 0, 0, " Unknown PPP LCP Option type %d\n", type); @@ -309,12 +349,159 @@ static void dumplcp(uint8_t *p, int l) } } +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(s, t); + } + else + { + 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 + { + // 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); + } + } +} + +static void lcp_restart(sessionidt s) +{ + session[s].ppp.phase = Establish; + // This-Layer-Down + change_state(s, ipcp, Dead); + change_state(s, ipv6cp, Dead); + change_state(s, ccp, Dead); +} + +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, s, session[s].tunnel, mtype, 0, 0, 0); + if (!queued) + return 0; + + *queued = ConfigRej; + queued += 4; + } + + if ((queued - buf + option[1]) > blen) + { + LOG(2, s, session[s].tunnel, "PPP overflow for ConfigRej (proto %u, option %u).\n", mtype, *option); + return 0; + } + + memcpy(queued, option, option[1]); + return queued + option[1]; +} + +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) +{ + int *nak_sent; + switch (mtype) + { + case PPPLCP: nak_sent = &sess_local[s].lcp.nak_sent; break; + case PPPIPCP: nak_sent = &sess_local[s].ipcp.nak_sent; break; + case PPPIPV6CP: nak_sent = &sess_local[s].ipv6cp.nak_sent; break; + default: return 0; // ? + } + + if (*response && **response != ConfigNak) + { + if (*nak_sent < config->ppp_max_failure) // reject queued + return queued; + + return ppp_conf_rej(s, buf, blen, mtype, response, 0, packet, option); + } + + if (!*response) + { + if (*nak_sent >= config->ppp_max_failure) + return ppp_conf_rej(s, buf, blen, mtype, response, 0, packet, option); + + queued = *response = makeppp(buf, blen, packet, 2, s, session[s].tunnel, mtype, 0, 0, 0); + if (!queued) + return 0; + + (*nak_sent)++; + *queued = ConfigNak; + queued += 4; + } + + if ((queued - buf + vlen + 2) > blen) + { + LOG(2, s, session[s].tunnel, "PPP overflow for ConfigNak (proto %u, option %u).\n", mtype, *option); + return 0; + } + + *queued++ = *option; + *queued++ = vlen + 2; + memcpy(queued, value, vlen); + 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); @@ -335,19 +522,79 @@ void processlcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) } l = hl; + 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) { - LOG(3, s, t, "LCP: Discarding ConfigAck\n"); - session[s].flags |= SF_LCP_ACKED; + int x = l - 4; + uint8_t *o = (p + 4); + int authtype = 0; + + while (x > 2) + { + int type = o[0]; + int length = o[1]; + + if (length == 0 || type == 0 || x < length) break; + switch (type) + { + case 3: // Authentication-Protocol + { + int proto = ntohs(*(uint16_t *)(o + 2)); + if (proto == PPPPAP) + authtype = AUTHPAP; + else if (proto == PPPCHAP && *(o + 4) == 5) + authtype = AUTHCHAP; + } + + break; + } + x -= length; + o += length; + } + + if (!session[s].ip && authtype) + sess_local[s].lcp_authtype = authtype; + + switch (session[s].ppp.lcp) + { + case RequestSent: + initialise_restart_count(s, lcp); + change_state(s, lcp, AckReceived); + break; + + case AckReceived: + case Opened: + 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); + change_state(s, lcp, RequestSent); + break; + + case AckSent: + lcp_open(s, t); + break; + + default: + LOG(2, s, t, "LCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.lcp)); + } } else if (*p == ConfigReq) { int x = l - 4; uint8_t *o = (p + 4); uint8_t *response = 0; - - LOG(3, s, t, "LCP: ConfigReq (%d bytes)...\n", l); - if (config->debug > 3) dumplcp(p, l); + static uint8_t asyncmap[4] = { 0, 0, 0, 0 }; // all zero + static uint8_t authproto[5]; + int changed = 0; while (x > 2) { @@ -358,352 +605,843 @@ 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; - if (response && *response != ConfigNak) // rej already queued - break; - - LOG(2, s, t, " Remote requesting asyncmap. Rejecting.\n"); - if (!response) - { - q = response = makeppp(b, sizeof(b), p, 2, t, s, PPPLCP); - if (!q) break; - *q = ConfigNak; - q += 4; - } - - if ((q - b + 11) > sizeof(b)) - { - LOG(2, s, t, "LCP overflow for asyncmap ConfigNak.\n"); - break; - } - - *q++ = type; - *q++ = 6; - memset(q, 0, 4); // asyncmap 0 - q += 4; - *((uint16_t *) (response + 2)) = htons(q - response); // LCP header length + 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 { int proto = ntohs(*(uint16_t *)(o + 2)); char proto_name[] = "0x0000"; + int alen; + if (proto == PPPPAP) - break; + { + if (config->radius_authtypes & AUTHPAP) + { + sess_local[s].lcp_authtype = AUTHPAP; + break; + } - if (response && *response != ConfigNak) // rej already queued - break; + strcpy(proto_name, "PAP"); + } + else if (proto == PPPCHAP) + { + if (config->radius_authtypes & AUTHCHAP + && *(o + 4) == 5) // MD5 + { + sess_local[s].lcp_authtype = AUTHCHAP; + break; + } - if (proto == PPPCHAP) strcpy(proto_name, "CHAP"); + } 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); - if (!response) - { - q = response = makeppp(b, sizeof(b), p, 2, t, s, PPPLCP); - if (!q) break; - *q = ConfigNak; - q += 4; - } + alen = add_lcp_auth(authproto, sizeof(authproto), config->radius_authprefer); + if (alen < 2) break; // paranoia - if ((q - b + length) > sizeof(b)) + 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) { - LOG(2, s, t, "LCP overflow for %s ConfigNak.\n", proto_name); - break; + // alternate type + alen = add_lcp_auth(authproto, sizeof(authproto), config->radius_authtypes & ~config->radius_authprefer); + if (alen < 2) break; + q = ppp_conf_nak(s, b, sizeof(b), PPPLCP, &response, q, p, o, authproto + 2, alen - 2); } - memcpy(q, o, length); - *(uint16_t *)(q += 2) = htons(PPPPAP); // NAK -> Use PAP instead - q += length; - *((uint16_t *) (response + 2)) = htons(q - response); + 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; - default: // Reject any unknown options - LOG(2, s, t, " Rejecting PPP LCP Option type %d\n", type); - if (!response || *response != ConfigRej) // drop nak in favour of rej + case 17: // Multilink Max-Receive-Reconstructed-Unit { - q = response = makeppp(b, sizeof(b), p, 2, t, s, PPPLCP); - if (!q) break; - *q = ConfigRej; - q += 4; + 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); } - - if ((q - b + length) > sizeof(b)) + break; + + case 18: // Multilink Short Sequence Number Header Format { - LOG(2, s, t, "LCP overflow for ConfigRej (type=%d).\n", type); - break; + 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; - memcpy(q, o, length); - q += length; - *((uint16_t *) (response + 2)) = htons(q - response); // LCP header length + default: // Reject any unknown options + 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 (!response) - { - // Send back a ConfigAck - q = response = makeppp(b, sizeof(b), p, l, t, s, PPPLCP); - if (!q) return; - *q = ConfigAck; - } - - LOG(3, s, t, "Sending %s\n", ppp_lcp_type(*response)); - tunnelsend(b, l + (q - b), t); + if (changed) + cluster_send_session(s); - if (!(session[s].flags & SF_LCP_ACKED)) - initlcp(t, s); - } - else if (*p == ConfigNak) - { - LOG(1, s, t, "Remote end sent a ConfigNak. Ignoring\n"); - if (config->debug > 3) dumplcp(p, l); - 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); - if (!q) return; - 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)) + if (response) { - LOG(3, s, t, "IPv6 rejected\n"); - session[s].flags |= SF_IPV6_NACKED; + l = q - response; // LCP packet length + *((uint16_t *) (response + 2)) = htons(l); // update header } else { - LOG(1, s, t, "Unexpected LCP protocol reject 0x%X\n", - ntohs(*(uint16_t *) (p+4))); - STAT(tunnel_rx_errors); + // Send packet back as ConfigAck + response = makeppp(b, sizeof(b), p, l, s, t, PPPLCP, 0, 0, 0); + if (!response) return; + *response = ConfigAck; } - } - 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); - if (!q) return; - tunnelsend(b, l + (q - b), t); // send it - } - else if (*p == EchoReply) - { - // Ignore it, last_packet time is set earlier than this. - } - else if (*p == IdentRequest) - { - *p = CodeRej; - if (l > MAXCONTROL) + + switch (session[s].ppp.lcp) { - LOG(1, s, t, "Truncated Ident Packet (length=%d) to 1400 bytes\n", l); - l = 1400; - } - q = makeppp(b, sizeof(b), p, l, t, s, PPPLCP); - if (!q) return; - LOG_HEX(5, "LCPIdentRej", q, l + 4); - tunnelsend(b, 12 + 4 + l, t); - } - else - { - LOG(1, s, t, "Unexpected LCP code %d\n", *p); - STAT(tunnel_rx_errors); - return ; - } -} + case Closed: + 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); + break; -// find a PPP option, returns point to option, or 0 if not found -static uint8_t *findppp(uint8_t *b, uint8_t mtype) -{ - uint16_t l = ntohs(*(uint16_t *) (b + 2)); - if (l < 4) - return 0; - b += 4; - l -= 4; - while (l) - { - if (l < b[1] || !b[1]) - return 0; // faulty - if (*b == mtype) - return b; - l -= b[1]; - b += b[1]; - } - return 0; -} + case Stopped: + initialise_restart_count(s, lcp); + sendlcp(s, t); + if (*response == ConfigAck) + change_state(s, lcp, AckSent); + else + change_state(s, lcp, RequestSent); -// Process IPCP messages -void processipcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) -{ - uint16_t hl; + break; - CSTAT(processipcp); + case RequestSent: + if (*response == ConfigAck) + change_state(s, lcp, AckSent); - LOG_HEX(5, "IPCP", p, l); - if (l < 5) - { - LOG(1, s, t, "Short IPCP %d bytes\n", l); - STAT(tunnel_rx_errors); - return ; + break; + + case AckReceived: + if (*response == ConfigAck) + lcp_open(s, t); + + break; + + case Opened: + lcp_restart(s); + sendlcp(s, t); + /* fallthrough */ + + case AckSent: + if (*response == ConfigAck) + change_state(s, lcp, AckSent); + else + change_state(s, lcp, RequestSent); + + break; + + default: + 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: send %s\n", ppp_code(*response)); + if (config->debug > 3) dumplcp(response, l); + + tunnelsend(b, l + (response - b), t); } + else if (*p == ConfigNak || *p == ConfigRej) + { + int x = l - 4; + uint8_t *o = (p + 4); + int authtype = -1; - if ((hl = ntohs(*(uint16_t *) (p + 2))) > l) + while (x > 2) + { + int type = o[0]; + int length = o[1]; + + if (length == 0 || type == 0 || x < length) break; + switch (type) + { + case 1: // Maximum-Receive-Unit + 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; + + 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 && length > 4 && *(o + 4) == 5) + { + authtype = config->radius_authtypes & AUTHCHAP; + LOG(3, s, t, " Remote requested CHAP authentication...%sing\n", + authtype ? "accept" : "reject"); + } + else + { + LOG(3, s, t, " Rejecting unsupported authentication %#4x\n", + proto); + } + } + else + { + LOG(2, s, t, "LCP: remote rejected auth negotiation\n"); + authtype = 0; // shutdown + } + + break; + + 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; + } + + if (!authtype) + { + sessionshutdown(s, "Unsupported authentication.", CDN_ADMIN_DISC, TERM_USER_ERROR); + return; + } + + if (authtype > 0) + sess_local[s].lcp_authtype = authtype; + + switch (session[s].ppp.lcp) + { + case Closed: + case Stopped: + { + 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; + + case RequestSent: + case AckSent: + initialise_restart_count(s, lcp); + sendlcp(s, t); + break; + + case AckReceived: + 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); + break; + + default: + 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(1, s, t, "Length mismatch IPCP %u/%u\n", hl, l); - STAT(tunnel_rx_errors); - return ; + 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 } - l = hl; + else if (*p == ProtocolRej) + { + uint16_t proto = 0; - if (*p == ConfigAck) + 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(3, s, t, "LCP protocol reject: 0x%04X\n", proto); + } + } + else if (*p == EchoReq) { - // happy with our IPCP - uint16_t r = session[s].radius; - if ((!r || radius[r].state == RADIUSIPCP) && !session[s].walled_garden) + *p = EchoReply; // reply + *(uint32_t *) (p + 4) = htonl(session[s].magic); // our magic number + 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 if (*p != CodeRej) + { + ppp_code_rej(s, t, PPPLCP, "LCP", p, l, b, sizeof(b)); + } +} + +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 (!r) - r = radiusnew(s); - if (r) - radiussend(r, RADIUSSTART); // send radius start, having got IPCP at last + 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; + } } - session[s].flags |= SF_IPCP_ACKED; + } - LOG(3, s, t, "IPCP Acked, session is now active\n"); + // No previously created bundle was found for this session, so create a new one + if (!(b = new_bundle())) return 0; - // clear LCP_ACKED/CCP_ACKED flag for possible fast renegotiaion for routers - session[s].flags &= ~(SF_LCP_ACKED|SF_CCP_ACKED); + 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); - return; + 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(sessionidt s, tunnelidt t) +{ + LOG(3, s, t, "IPCP: Opened, session is now active\n"); + + change_state(s, ipcp, Opened); + + 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(s, t); + change_state(s, ipv6cp, RequestSent); } - if (*p != ConfigReq) +} + +// Process IPCP messages +void processipcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) +{ + uint8_t b[MAXETHER]; + uint8_t *q = 0; + uint16_t hl; + + CSTAT(processipcp); + + LOG_HEX(5, "IPCP", p, l); + if (l < 4) { - LOG(1, s, t, "Unexpected IPCP code %d\n", *p); + LOG(1, s, t, "Short IPCP %d bytes\n", l); STAT(tunnel_rx_errors); return ; } - LOG(4, s, t, "IPCP ConfigReq received\n"); - if (!session[s].ip) + if ((hl = ntohs(*(uint16_t *) (p + 2))) > l) { - LOG(3, s, t, "Waiting on radius reply\n"); - return; // have to wait on RADIUS reply + LOG(1, s, t, "Length mismatch IPCP %u/%u\n", hl, l); + STAT(tunnel_rx_errors); + return ; } - // form a config reply quoting the IP in the session + l = hl; + + if (session[s].ppp.phase < Network) { - uint8_t b[MAXCONTROL]; - uint8_t *i, *q; + LOG(2, s, t, "IPCP %s ignored in %s phase\n", ppp_code(*p), ppp_phase(session[s].ppp.phase)); + return; + } + + LOG(3, s, t, "IPCP: recv %s\n", ppp_code(*p)); - q = p + 4; - i = p + l; - while (q < i && q[1]) + if (*p == ConfigAck) + { + switch (session[s].ppp.ipcp) { - if (*q != 0x81 && *q != 0x83 && *q != 3) - break; - q += q[1]; + case RequestSent: + initialise_restart_count(s, ipcp); + change_state(s, ipcp, AckReceived); + break; + + case AckReceived: + case Opened: + 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(s, t); + break; + + default: + LOG(2, s, t, "IPCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ipcp)); } - if (q < i) + } + else if (*p == ConfigReq) + { + uint8_t *response = 0; + uint8_t *o = p + 4; + int length = l - 4; + int gotip = 0; + in_addr_t addr; + + while (length > 2) { - // reject - uint16_t n = 4; - i = p + l; - if (!(q = makeppp(b, sizeof(b), p, l, t, s, PPPIPCP))) - return; + if (!o[1] || o[1] > length) return; - *q = ConfigRej; - p += 4; - while (p < i && p[1]) + switch (*o) { - if (*p != 0x81 && *p != 0x83 && *p != 3) + case 3: // ip address + gotip++; // seen address + if (o[1] != 6) return; + + addr = htonl(session[s].ip); + if (memcmp(o + 2, &addr, (sizeof addr))) { - LOG(2, s, t, "IPCP reject %d\n", *p); - memcpy(q + n, p, p[1]); - n += p[1]; + 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.", CDN_ADMIN_DISC, TERM_USER_ERROR); + return; + } } - p += p[1]; - } - *(uint16_t *) (q + 2) = htons(n); - LOG(4, s, t, "Sending ConfigRej\n"); - tunnelsend(b, n + (q - b), t); // send it - } - else - { - LOG(4, s, t, "Sending ConfigAck\n"); - *p = ConfigAck; - if ((i = findppp(p, 0x81))) // Primary DNS address - { - if (*(uint32_t *) (i + 2) != htonl(session[s].dns1)) + + break; + + case 129: // primary DNS + if (o[1] != 6) return; + + addr = htonl(session[s].dns1); + if (memcmp(o + 2, &addr, (sizeof addr))) { - *(uint32_t *) (i + 2) = htonl(session[s].dns1); - *p = ConfigNak; - LOG(5, s, t, " DNS1 = %s\n", - fmtaddr(htonl(session[s].dns1), 0)); + q = ppp_conf_nak(s, b, sizeof(b), PPPIPCP, &response, q, p, o, (uint8_t *) &addr, sizeof(addr)); + if (!q) return; } - } - if ((i = findppp(p, 0x83))) // Secondary DNS address (TBA, is it) - { - if (*(uint32_t *) (i + 2) != htonl(session[s].dns2)) + + break; + + case 131: // secondary DNS + if (o[1] != 6) return; + + addr = htonl(session[s].dns2); + if (memcmp(o + 2, &addr, sizeof(addr))) { - *(uint32_t *) (i + 2) = htonl(session[s].dns2); - *p = ConfigNak; - LOG(5, s, t, " DNS2 = %s\n", - fmtaddr(htonl(session[s].dns2), 0)); + q = ppp_conf_nak(s, b, sizeof(b), PPPIPCP, &response, q, p, o, (uint8_t *) &addr, sizeof(addr)); + if (!q) return; } + + break; + + default: + LOG(2, s, t, " Rejecting PPP IPCP Option type %d\n", *o); + q = ppp_conf_rej(s, b, sizeof(b), PPPIPCP, &response, q, p, o); + if (!q) return; } - i = findppp(p, 3); // IP address - if (!i || i[1] != 6) - { - LOG(1, s, t, "No IP in IPCP request\n"); - STAT(tunnel_rx_errors); - return ; - } - if (*(uint32_t *) (i + 2) != htonl(session[s].ip)) - { - *(uint32_t *) (i + 2) = htonl(session[s].ip); - *p = ConfigNak; - LOG(4, s, t, " No, a ConfigNak, client is requesting IP - sending %s\n", - fmtaddr(htonl(session[s].ip), 0)); - } - if (!(q = makeppp(b, sizeof(b), p, l, t, s, PPPIPCP))) - return; - tunnelsend(b, l + (q - b), t); // send it + length -= o[1]; + o += o[1]; } + + if (response) + { + l = q - response; // IPCP packet length + *((uint16_t *) (response + 2)) = htons(l); // update header + } + else if (gotip) + { + // Send packet back as ConfigAck + response = makeppp(b, sizeof(b), p, l, s, t, PPPIPCP, 0, 0, 0); + if (!response) return; + *response = ConfigAck; + } + else + { + LOG(1, s, t, "No IP in IPCP request\n"); + STAT(tunnel_rx_errors); + return; + } + + switch (session[s].ppp.ipcp) + { + case Closed: + 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); + break; + + case Stopped: + initialise_restart_count(s, ipcp); + sendipcp(s, t); + if (*response == ConfigAck) + change_state(s, ipcp, AckSent); + else + change_state(s, ipcp, RequestSent); + + break; + + case RequestSent: + if (*response == ConfigAck) + change_state(s, ipcp, AckSent); + + break; + + case AckReceived: + if (*response == ConfigAck) + ipcp_open(s, t); + + break; + + case Opened: + initialise_restart_count(s, ipcp); + sendipcp(s, t); + /* fallthrough */ + + case AckSent: + if (*response == ConfigAck) + change_state(s, ipcp, AckSent); + else + change_state(s, ipcp, RequestSent); + + break; + + default: + 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: send %s\n", ppp_code(*response)); + tunnelsend(b, l + (response - b), t); + } + else if (*p == TerminateReq) + { + switch (session[s].ppp.ipcp) + { + case Closed: + case Stopped: + case Closing: + case Stopping: + case RequestSent: + case AckReceived: + case AckSent: + break; + + 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 = TerminateAck; // send ack + 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)); + 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(sessionidt s, tunnelidt t) +{ + 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(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[MAXETHER]; + uint8_t *q = 0; + uint16_t hl; CSTAT(processipv6cp); @@ -714,112 +1452,196 @@ void processipv6cp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) STAT(tunnel_rx_errors); return ; } + + if ((hl = ntohs(*(uint16_t *) (p + 2))) > l) + { + LOG(1, s, t, "Length mismatch IPV6CP %u/%u\n", hl, l); + STAT(tunnel_rx_errors); + return ; + } + l = hl; + + if (session[s].ppp.phase < Network) + { + LOG(2, s, t, "IPV6CP %s ignored in %s phase\n", ppp_code(*p), ppp_phase(session[s].ppp.phase)); + return; + } + + LOG(3, s, t, "IPV6CP: recv %s\n", ppp_code(*p)); + + if (!session[s].ip) + { + LOG(3, s, t, "IPV6CP: no IPv4 address (IPCP in state %s)\n", ppp_state(session[s].ppp.ipcp)); + return; // need IPCP to complete... + } + if (*p == ConfigAck) { - // happy with our IPV6CP - session[s].flags |= SF_IPV6CP_ACKED; + switch (session[s].ppp.ipv6cp) + { + case RequestSent: + initialise_restart_count(s, ipv6cp); + change_state(s, ipv6cp, AckReceived); + break; + + case AckReceived: + case Opened: + 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(s, t); + break; + + default: + LOG(2, s, t, "IPV6CP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ipv6cp)); + } + } + else if (*p == ConfigReq) + { + uint8_t *response = 0; + uint8_t *o = p + 4; + int length = l - 4; + int gotip = 0; + uint8_t ident[8]; + + while (length > 2) + { + if (!o[1] || o[1] > length) return; + + switch (*o) + { + case 1: // interface identifier + gotip++; // seen address + 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_conf_nak(s, b, sizeof(b), PPPIPV6CP, &response, q, p, o, ident, sizeof(ident)); + if (!q) return; + } + + break; + + default: + LOG(2, s, t, " Rejecting PPP IPV6CP Option type %d\n", *o); + q = ppp_conf_rej(s, b, sizeof(b), PPPIPV6CP, &response, q, p, o); + if (!q) return; + } + + length -= o[1]; + o += o[1]; + } + + if (response) + { + l = q - response; // IPV6CP packet length + *((uint16_t *) (response + 2)) = htons(l); // update header + } + else if (gotip) + { + // Send packet back as ConfigAck + response = makeppp(b, sizeof(b), p, l, s, t, PPPIPV6CP, 0, 0, 0); + if (!response) return; + *response = ConfigAck; + } + else + { + LOG(1, s, t, "No interface identifier in IPV6CP request\n"); + STAT(tunnel_rx_errors); + return; + } + + switch (session[s].ppp.ipv6cp) + { + case Closed: + 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); + break; + + case Stopped: + initialise_restart_count(s, ipv6cp); + sendipv6cp(s, t); + if (*response == ConfigAck) + change_state(s, ipv6cp, AckSent); + else + change_state(s, ipv6cp, RequestSent); + + break; + + case RequestSent: + if (*response == ConfigAck) + change_state(s, ipv6cp, AckSent); + + break; + + case AckReceived: + if (*response == ConfigAck) + ipv6cp_open(s, t); + + break; + + case Opened: + initialise_restart_count(s, ipv6cp); + sendipv6cp(s, t); + /* fallthrough */ - LOG(3, s, t, "IPV6CP Acked, IPv6 is now active\n"); - // Add a routed block if configured. - if (session[s].ipv6prefixlen) - { - route6set(s, session[s].ipv6route, session[s].ipv6prefixlen, 1); - session[s].flags |= SF_IPV6_ROUTED; + case AckSent: + if (*response == ConfigAck) + change_state(s, ipv6cp, AckSent); + else + change_state(s, ipv6cp, RequestSent); + + break; + + default: + LOG(2, s, t, "IPV6CP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ipv6cp)); + return; } - // Send an initial RA (TODO: Should we send these regularly?) - send_ipv6_ra(t, s, NULL); - return; + LOG(3, s, t, "IPV6CP: send %s\n", ppp_code(*response)); + tunnelsend(b, l + (response - b), t); } - if (*p != ConfigReq) + else if (*p == TerminateReq) { - LOG(1, s, t, "Unexpected IPV6CP code %d\n", *p); - STAT(tunnel_rx_errors); - return; - } + 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; - LOG(4, s, t, "IPV6CP ConfigReq received\n"); - if (ntohs(*(uint16_t *) (p + 2)) > l) - { - LOG(1, s, t, "Length mismatch IPV6CP %d/%d\n", ntohs(*(uint16_t *) (p + 2)), l); - STAT(tunnel_rx_errors); - return ; - } - if (!session[s].ip) - { - LOG(3, s, t, "Waiting on radius reply\n"); - return; // have to wait on RADIUS reply + default: + LOG(2, s, t, "IPV6CP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ipv6cp)); + return; + } + + *p = TerminateAck; // send ack + 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)); + tunnelsend(b, l + (q - b), t); // send it } - // form a config reply quoting the IP in the session + else if (*p != CodeRej) { - uint8_t b[MAXCONTROL]; - uint8_t *i, - *q; - - l = ntohs(*(uint16_t *) (p + 2)); // We must use length from IPV6CP len field - q = p + 4; - i = p + l; - while (q < i && q[1]) - { - if (*q != 1) - break; - q += q[1]; - } - if (q < i) - { - // reject - uint16_t n = 4; - i = p + l; - if (!(q = makeppp(b, sizeof(b), p, l, t, s, PPPIPV6CP))) - { - LOG(2, s, t, "Failed to send IPV6CP ConfigRej\n"); - return; - } - *q = ConfigRej; - p += 4; - while (p < i && p[1]) - { - if (*p != 1) - { - LOG(2, s, t, "IPV6CP reject %d\n", *p); - memcpy(q + n, p, p[1]); - n += p[1]; - } - p += p[1]; - } - *(uint16_t *) (q + 2) = htons(n); - LOG(4, s, t, "Sending ConfigRej\n"); - tunnelsend(b, n + (q - b), t); // send it - } - else - { - LOG(4, s, t, "Sending ConfigAck\n"); - *p = ConfigAck; - i = findppp(p, 1); // IP address - if (!i || i[1] != 10) - { - LOG(1, s, t, "No IP in IPV6CP request\n"); - STAT(tunnel_rx_errors); - return ; - } - if ((*(uint32_t *) (i + 2) != htonl(session[s].ip)) || - (*(uint32_t *) (i + 6) != 0)) - { - *(uint32_t *) (i + 2) = htonl(session[s].ip); - *(uint32_t *) (i + 6) = 0; - *p = ConfigNak; - LOG(4, s, t, - " No, a ConfigNak, client is " - "requesting IP - sending %s\n", - fmtaddr(htonl(session[s].ip), 0)); - } - if (!(q = makeppp(b, sizeof(b), p, l, t, s, PPPIPV6CP))) - { - LOG(2, s, t, " Failed to send IPV6CP packet.\n"); - return; - } - tunnelsend(b, l + (q - b), t); // send it - } + ppp_code_rej(s, t, PPPIPV6CP, "IPV6CP", p, l, b, sizeof(b)); } } @@ -827,7 +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; @@ -835,6 +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) @@ -844,17 +1673,31 @@ void processipin(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) return ; } - // no spoof (do sessionbyip to handled statically routed subnets) - if (ip != session[s].ip && sessionbyip(htonl(ip)) != s) - { - LOG(5, s, t, "Dropping packet with spoofed IP %s\n", fmtaddr(htonl(ip), 0)); + if (session[s].ppp.phase != Network || session[s].ppp.ipcp != Opened) return; + + if (!session[s].bundle || bundle[session[s].bundle].num_of_links < 2) // FIXME: + { + // 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); @@ -884,28 +1727,194 @@ void processipin(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) return; } + p += 4; + l -= 4; + if (session[s].snoop_ip && session[s].snoop_port) { // Snooping this session - snoop_send_packet(p + 4, l - 4, session[s].snoop_ip, session[s].snoop_port); + snoop_send_packet(p, l, session[s].snoop_ip, session[s].snoop_port); } - session[s].cin += l - 4; - session[s].total_cin += l - 4; - sess_local[s].cin += l - 4; - + increment_counter(&session[s].cin, &session[s].cin_wrap, l); + session[s].cin_delta += l; session[s].pin++; - eth_tx += l - 4; + + sess_local[s].cin += l; + sess_local[s].pin++; + + eth_tx += l; STAT(tun_tx_packets); - INC_STAT(tun_tx_bytes, l - 4); + 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; @@ -924,6 +1933,9 @@ void processipv6in(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) return ; } + if (session[s].ppp.phase != Network || session[s].ppp.ipv6cp != Opened) + return; + // no spoof if (ipv4 != session[s].ip && memcmp(&config->ipv6_prefix, &ip, 8) && sessionbyipv6(ip) != s) { @@ -939,7 +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; } @@ -972,21 +1984,26 @@ void processipv6in(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) return; } + p += 4; + l -= 4; + if (session[s].snoop_ip && session[s].snoop_port) { // Snooping this session - snoop_send_packet(p + 4, l - 4, session[s].snoop_ip, session[s].snoop_port); + snoop_send_packet(p, l, session[s].snoop_ip, session[s].snoop_port); } - session[s].cin += l - 4; - session[s].total_cin += l - 4; - sess_local[s].cin += l - 4; - + increment_counter(&session[s].cin, &session[s].cin_wrap, l); + session[s].cin_delta += l; session[s].pin++; - eth_tx += l - 4; + + sess_local[s].cin += l; + sess_local[s].pin++; + + eth_tx += l; STAT(tun_tx_packets); - INC_STAT(tun_tx_bytes, l - 4); + INC_STAT(tun_tx_bytes, l); } // @@ -1006,19 +2023,24 @@ void send_ipin(sessionidt s, uint8_t *buf, int len) return; } + buf += 4; + len -= 4; + if (session[s].snoop_ip && session[s].snoop_port) { // Snooping this session - snoop_send_packet(buf + 4, len - 4, session[s].snoop_ip, session[s].snoop_port); + snoop_send_packet(buf, len, session[s].snoop_ip, session[s].snoop_port); } // Increment packet counters - session[s].cin += len - 4; - session[s].total_cin += len - 4; - sess_local[s].cin += len - 4; - + increment_counter(&session[s].cin, &session[s].cin_wrap, len); + session[s].cin_delta += len; session[s].pin++; - eth_tx += len - 4; + + sess_local[s].cin += len; + sess_local[s].pin++; + + eth_tx += len; STAT(tun_tx_packets); INC_STAT(tun_tx_bytes, len - 4); @@ -1026,65 +2048,140 @@ 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); LOG_HEX(5, "CCP", p, l); - switch (l > 1 ? *p : 0) + + if (session[s].ppp.phase < Network) { - case ConfigAck: - session[s].flags |= SF_CCP_ACKED; + LOG(2, s, t, "CCP %s ignored in %s phase\n", ppp_code(*p), ppp_phase(session[s].ppp.phase)); return; + } - case ConfigReq: - if (l < 6) // accept no compression + if (l < 1) + { + LOG(1, s, t, "Short CCP packet\n"); + STAT(tunnel_rx_errors); + } + + LOG(4, s, t, "CCP: recv %s\n", ppp_code(*p)); + if (*p == ConfigAck) + { + switch (session[s].ppp.ccp) { - *p = ConfigAck; + case RequestSent: + initialise_restart_count(s, ccp); + change_state(s, ccp, AckReceived); + break; + + case AckReceived: + case Opened: + 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: Opened\n"); + change_state(s, ccp, Opened); break; + + default: + LOG(2, s, t, "CCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ccp)); } + } + else if (*p == ConfigReq) + { + if (l < 6) // accept no compression + *p = ConfigAck; + else // compression requested--reject + *p = ConfigRej; - // compression requested--reject - *p = ConfigRej; + q = makeppp(b, sizeof(b), p, l, s, t, PPPCCP, 0, 0, 0); + if (!q) return; - // send CCP request for no compression for our end if not negotiated - if (!(session[s].flags & SF_CCP_ACKED)) - initccp(t, s); + switch (session[s].ppp.ccp) + { + case Closed: + 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); + break; - break; + case Stopped: + initialise_restart_count(s, ccp); + sendccp(s, t); + if (*q == ConfigAck) + change_state(s, ccp, AckSent); + else + change_state(s, ccp, RequestSent); - case TerminateReq: - *p = TerminateAck; - break; + break; - default: - if (l > 1) - LOG(1, s, t, "Unexpected CCP request code %d\n", *p); - else - LOG(1, s, t, "Short CCP packet\n"); + case RequestSent: + if (*q == ConfigAck) + change_state(s, ccp, AckSent); - STAT(tunnel_rx_errors); - return; - } + break; - if (!(q = makeppp(b, sizeof(b), p, l, t, s, PPPCCP))) - return; + case AckReceived: + if (*q == ConfigAck) + change_state(s, ccp, Opened); + + break; + + case Opened: + initialise_restart_count(s, ccp); + sendccp(s, t); + /* fallthrough */ + + case AckSent: + if (*q == ConfigAck) + change_state(s, ccp, AckSent); + else + change_state(s, ccp, RequestSent); - tunnelsend(b, l + (q - b), t); // send it + break; + + default: + LOG(2, s, t, "CCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ccp)); + return; + } + + 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, 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 if (*p != CodeRej) + { + ppp_code_rej(s, t, PPPCCP, "CCP", p, l, b, sizeof(b)); + } } -// send a CHAP PP packet -void sendchap(tunnelidt t, sessionidt s) +// send a CHAP challenge +void sendchap(sessionidt s, tunnelidt t) { - uint8_t b[MAXCONTROL]; - uint16_t r = session[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"); @@ -1094,8 +2191,6 @@ void sendchap(tunnelidt t, sessionidt s) LOG(1, s, t, "Send CHAP challenge\n"); - // new challenge - random_data(radius[r].auth, sizeof(radius[r].auth)); radius[r].chap = 1; // CHAP not PAP radius[r].id++; if (radius[r].state != RADIUSCHAP) @@ -1105,102 +2200,240 @@ void sendchap(tunnelidt t, sessionidt s) radius[r].retry = backoff(radius[r].try++); if (radius[r].try > 5) { - sessionshutdown(s, "Timeout CHAP", 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 q[1] = radius[r].id; // ID - q[4] = 16; // length + q[4] = 16; // value size (size of challenge) memcpy(q + 5, radius[r].auth, 16); // challenge - strcpy(q + 21, hostname); // our name + strcpy((char *) q + 21, hostname); // our name *(uint16_t *) (q + 2) = htons(strlen(hostname) + 21); // length tunnelsend(b, strlen(hostname) + 21 + (q - b), t); // send it } // 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) + { + // 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) { - 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) + 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); return b; } -// Send initial LCP ConfigReq for PAP, set magic no. -void initlcp(tunnelidt t, sessionidt s) +static int add_lcp_auth(uint8_t *b, int size, int authtype) +{ + int len = 0; + if ((authtype == AUTHCHAP && size < 5) || size < 4) + return 0; + + *b++ = 3; // Authentication-Protocol + if (authtype == AUTHCHAP) + { + len = *b++ = 5; // length + *(uint16_t *) b = htons(PPPCHAP); b += 2; + *b++ = 5; // MD5 + } + else if (authtype == AUTHPAP) + { + len = *b++ = 4; // length + *(uint16_t *) b = htons(PPPPAP); b += 2; + } + else + { + LOG(0, 0, 0, "add_lcp_auth called with unsupported auth type %d\n", authtype); + } + + return len; +} + +// Send LCP ConfigReq for MRU, authentication type and magic no +void sendlcp(sessionidt s, tunnelidt t) { - char b[500], *q; + 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 for PAP\n"); - *q = ConfigReq; - *(uint8_t *)(q + 1) = (time_now % 255) + 1; // ID - *(uint16_t *)(q + 2) = htons(14); // Length - *(uint8_t *)(q + 4) = 5; - *(uint8_t *)(q + 5) = 6; - *(uint32_t *)(q + 6) = htonl(session[s].magic); - *(uint8_t *)(q + 10) = 3; - *(uint8_t *)(q + 11) = 4; - *(uint16_t *)(q + 12) = htons(PPPPAP); // PAP - - LOG_HEX(5, "PPPLCP", q, 14); - tunnelsend(b, (q - b) + 14, t); + 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++ = ++sess_local[s].lcp_ident; // ID + + l += 2; //Save space for length + + 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); + + 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 -static void initccp(tunnelidt t, sessionidt s) +void sendccp(sessionidt s, tunnelidt t) { - char b[500], *q; + 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); }