X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/8ba3da90adb77aa5f2915d72923b774a0d2fd1ae..174de2c0d7c678252af2b9522f8e2073ab4d7ac3:/ppp.c diff --git a/ppp.c b/ppp.c index 1834bd0..fd89d91 100644 --- a/ppp.c +++ b/ppp.c @@ -1,6 +1,6 @@ // L2TPNS PPP Stuff -char const *cvs_id_ppp = "$Id: ppp.c,v 1.95 2006/02/17 14:35:54 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 1.95 2006/02/17 14:35:54 bodea Exp $"; #include "cluster.h" extern tunnelt *tunnel; +extern bundlet *bundle; +extern fragmentationt *frag; extern sessiont *session; extern radiust *radius; extern int tunfd; @@ -24,6 +26,10 @@ 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(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) @@ -40,7 +46,7 @@ void processpap(sessionidt s, tunnelidt t, 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(sessionidt s, tunnelidt t, 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(sessionidt s, tunnelidt t, 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; } @@ -90,7 +96,7 @@ void processpap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) // respond now, either no RADIUS available or already authenticated uint8_t b[MAXETHER]; uint8_t id = p[1]; - uint8_t *p = makeppp(b, sizeof(b), 0, 0, s, t, PPPPAP); + uint8_t *p = makeppp(b, sizeof(b), 0, 0, s, t, PPPPAP, 0, 0, 0); if (!p) return; if (session[s].ip) @@ -110,7 +116,7 @@ void processpap(sessionidt s, tunnelidt t, 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 @@ -152,7 +158,7 @@ void processchap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) { 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; } @@ -160,7 +166,7 @@ void processchap(sessionidt s, tunnelidt t, 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; @@ -169,20 +175,28 @@ void processchap(sessionidt s, tunnelidt t, 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; } - r = sess_local[s].radius; - if (!r) + if (session[s].ppp.phase != Authenticate) { - LOG(3, s, t, "Unexpected CHAP message\n"); + LOG(2, s, t, "CHAP ignored in %s phase\n", ppp_phase(session[s].ppp.phase)); return; } - if (session[s].ppp.phase != Authenticate) + r = sess_local[s].radius; + if (!r) { - LOG(2, s, t, "CHAP ignored in %s phase\n", ppp_phase(session[s].ppp.phase)); + 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; } @@ -190,7 +204,7 @@ void processchap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) { 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; } @@ -198,7 +212,7 @@ void processchap(sessionidt s, tunnelidt t, 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; } @@ -208,7 +222,7 @@ void processchap(sessionidt s, tunnelidt t, 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; } @@ -352,16 +366,29 @@ void lcp_open(sessionidt s, tunnelidt 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); + 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); + } } } @@ -379,7 +406,7 @@ static uint8_t *ppp_conf_rej(sessionidt s, uint8_t *buf, size_t blen, uint16_t m { if (!*response || **response != ConfigRej) { - queued = *response = makeppp(buf, blen, packet, 2, s, session[s].tunnel, mtype); + queued = *response = makeppp(buf, blen, packet, 2, s, session[s].tunnel, mtype, 0, 0, 0); if (!queued) return 0; @@ -423,7 +450,7 @@ static uint8_t *ppp_conf_nak(sessionidt s, uint8_t *buf, size_t blen, uint16_t m 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); + queued = *response = makeppp(buf, blen, packet, 2, s, session[s].tunnel, mtype, 0, 0, 0); if (!queued) return 0; @@ -455,7 +482,7 @@ static void ppp_code_rej(sessionidt s, tunnelidt t, uint16_t proto, l += 4; if (l > mru) l = mru; - q = makeppp(buf, size, 0, 0, s, t, proto); + q = makeppp(buf, size, 0, 0, s, t, proto, 0, 0, 0); if (!q) return; *q = CodeRej; @@ -567,6 +594,7 @@ void processlcp(sessionidt s, tunnelidt t, 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]; + int changed = 0; while (x > 2) { @@ -582,7 +610,7 @@ void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) if (mru >= MINMTU) { session[s].mru = mru; - cluster_send_session(s); + changed++; break; } @@ -655,6 +683,64 @@ void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) 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(3, s, t, " Rejecting unknown PPP LCP option %d\n", type); q = ppp_conf_rej(s, b, sizeof(b), PPPLCP, &response, q, p, o); @@ -663,6 +749,9 @@ void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) o += length; } + if (changed) + cluster_send_session(s); + if (response) { l = q - response; // LCP packet length @@ -671,7 +760,7 @@ void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) else { // Send packet back as ConfigAck - response = makeppp(b, sizeof(b), p, l, s, t, PPPLCP); + response = makeppp(b, sizeof(b), p, l, s, t, PPPLCP, 0, 0, 0); if (!response) return; *response = ConfigAck; } @@ -679,7 +768,7 @@ void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) switch (session[s].ppp.lcp) { case Closed: - response = makeppp(b, sizeof(b), p, 2, s, t, 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); @@ -747,6 +836,7 @@ void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) 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); } @@ -764,14 +854,18 @@ void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) 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", @@ -792,19 +886,68 @@ void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) 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); - if (!session[s].magic) session[s].magic = time_now; // Netgear DG814 sends zero?? - cluster_send_session(s); - break; + 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"); } - // ConfigRej: fallthrough + } + 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.", 3, 0); + sessionshutdown(s, "Unable to negotiate LCP.", CDN_ADMIN_DISC, TERM_USER_ERROR); return; } x -= length; @@ -813,7 +956,7 @@ void processlcp(sessionidt s, tunnelidt t, 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; } @@ -825,7 +968,7 @@ void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) case Closed: case Stopped: { - uint8_t *response = makeppp(b, sizeof(b), p, 2, s, t, 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); @@ -860,19 +1003,36 @@ void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) } else if (*p == TerminateReq) { - *p = TerminateAck; // close - q = makeppp(b, sizeof(b), p, l, s, t, 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) { @@ -902,7 +1062,7 @@ void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) { *p = EchoReply; // reply *(uint32_t *) (p + 4) = htonl(session[s].magic); // our magic number - q = makeppp(b, sizeof(b), p, l, s, t, 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)); @@ -920,6 +1080,93 @@ void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) } } +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; + } + } + } + + // No previously created bundle was found for this session, so create a new one + if (!(b = new_bundle())) return 0; + + 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(sessionidt s, tunnelidt t) { LOG(3, s, t, "IPCP: Opened, session is now active\n"); @@ -957,7 +1204,7 @@ void processipcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) 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); @@ -1029,7 +1276,7 @@ void processipcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) 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; } } @@ -1078,7 +1325,7 @@ void processipcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) else if (gotip) { // Send packet back as ConfigAck - response = makeppp(b, sizeof(b), p, l, s, t, PPPIPCP); + response = makeppp(b, sizeof(b), p, l, s, t, PPPIPCP, 0, 0, 0); if (!response) return; *response = ConfigAck; } @@ -1092,7 +1339,7 @@ void processipcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) switch (session[s].ppp.ipcp) { case Closed: - response = makeppp(b, sizeof(b), p, 2, s, t, 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); @@ -1143,12 +1390,33 @@ void processipcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) } else if (*p == TerminateReq) { - *p = TerminateAck; - q = makeppp(b, sizeof(b), p, l, s, t, PPPIPCP); + 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); - change_state(s, ipcp, Stopped); + tunnelsend(b, l + (q - b), t); // send it } else if (*p != CodeRej) { @@ -1278,7 +1546,7 @@ void processipv6cp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) else if (gotip) { // Send packet back as ConfigAck - response = makeppp(b, sizeof(b), p, l, s, t, PPPIPV6CP); + response = makeppp(b, sizeof(b), p, l, s, t, PPPIPV6CP, 0, 0, 0); if (!response) return; *response = ConfigAck; } @@ -1292,7 +1560,7 @@ void processipv6cp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) switch (session[s].ppp.ipv6cp) { case Closed: - response = makeppp(b, sizeof(b), p, 2, s, t, PPPIPV6CP); + response = makeppp(b, sizeof(b), p, 2, s, t, PPPIPV6CP, 0, 0, 0); if (!response) return; *response = TerminateAck; *((uint16_t *) (response + 2)) = htons(l = 4); @@ -1343,12 +1611,33 @@ void processipv6cp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) } else if (*p == TerminateReq) { - *p = TerminateAck; - q = makeppp(b, sizeof(b), p, l, s, t, PPPIPV6CP); + 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; + + 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); - change_state(s, ipv6cp, Stopped); + tunnelsend(b, l + (q - b), t); // send it } else if (*p != CodeRej) { @@ -1387,11 +1676,14 @@ void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) if (session[s].ppp.phase != Network || session[s].ppp.ipcp != Opened) return; - // no spoof (do sessionbyip to handled statically routed subnets) - if (ip != session[s].ip && sessionbyip(htonl(ip)) != s) + if (!session[s].bundle || bundle[session[s].bundle].num_of_links < 2) // FIXME: { - LOG(5, s, t, "Dropping packet with spoofed IP %s\n", fmtaddr(htonl(ip), 0)); - return; + // no spoof (do sessionbyip to handled statically routed subnets) + if (ip != session[s].ip && sessionbyip(htonl(ip)) != s) + { + LOG(4, s, t, "Dropping packet with spoofed IP %s\n", fmtaddr(htonl(ip), 0)); + return; + } } // run access-list if any @@ -1457,6 +1749,167 @@ void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) INC_STAT(tun_tx_bytes, l); } +// process Multilink PPP packet received +void processmpin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) +{ + bundleidt b = session[s].bundle; + uint8_t begin_frame; + uint8_t end_frame; + uint32_t seq_num; + uint32_t offset; + + if (!b) + { + LOG(3, s, t, "MPPP: Invalid bundle id: 0\n"); + return; + } + + begin_frame = (*p & 0x80); + end_frame = (*p & 0x40); + if (session[s].mssf) + { + // Get 12 bit for seq number + uint16_t short_seq_num = ntohs((*(uint16_t *) p) & 0xFF0F); + uint16_t short_seq_num2 = short_seq_num >> 4; + p += 2; + l -= 2; + seq_num = short_seq_num2; + // After this point the pointer should be advanced 2 bytes + LOG(3, s, t, "MPPP: 12 bits, sequence number: %d, short1: %d, short2: %d\n",seq_num, short_seq_num, short_seq_num2); + } + else + { + // Get 24 bit for seq number + p++; + seq_num = ntohl((*(uint32_t *) p) & 0xFFFFFF00); + seq_num = seq_num >> 8; + p += 3; + l -= 4; + // After this point the pointer should be advanced 4 bytes + LOG(4, s, t, "MPPP: 24 bits sequence number:%d\n",seq_num); + } + + if (seq_num - bundle[b].offset < 0) + { + bundle[b].offset = 0; + bundle[b].pending_frag = 0; + } + + offset = bundle[b].offset; + if (begin_frame) + { + // Check for previous non-assembled frames + int error = 0; + if (bundle[b].pending_frag) + { + uint32_t fn = bundle[b].seq_num_m - offset; + uint16_t cur_len; + bundle[b].pending_frag = 0; + // Check for array indexes + if (fn < 0 || fn > MAXFRAGNUM) + { + LOG(2, s, t, "ERROR: Index out of range fn:%d, bundle:%d\n",fn,b); + return; + } + + if (seq_num-offset < 0 || seq_num-offset > MAXFRAGNUM) + { + LOG(2, s, t, "ERROR: Index out of range fn(last):%d, bundle:%d\n",fn,b); + return; + } + ///////////////////////////////////////////////////// + cur_len = 4; // This is set to 4 to leave 4 bytes for function processipin + for (fn = bundle[b].seq_num_m - offset; fn < seq_num - offset; fn++) + { + if (!frag[b].fragment[fn].length) + { + LOG(4, s, t, "MPPP: Found lost fragment while reassembling frame %d in (%d,%d)\n",fn, bundle[b].seq_num_m-offset, seq_num-offset); + error = 1; + break; + } + + if (cur_len + frag[b].fragment[fn].length > MAXETHER) + { + LOG(2, s, t, "MPPP: ERROR: very long frame after assembling %d\n", frag[b].fragment[fn].length+cur_len); + error = 1; + break; + } + + memcpy(frag[b].reassembled_frame+cur_len, frag[b].fragment[fn].data, frag[b].fragment[fn].length); + cur_len += frag[b].fragment[fn].length; + frag[b].fragment[fn].length = 0; // Indicates that this fragment has been consumed + // This is usefull for compression + memset(frag[b].fragment[fn].data, 0, sizeof(frag[b].fragment[fn].data)); + } + + if (!error) + { + frag[b].re_frame_len = cur_len; + // Process the resassembled frame + LOG(4, s, t, "MPPP: Process the reassembled frame, len=%d\n",cur_len); + processmpframe(s, t, frag[b].reassembled_frame, frag[b].re_frame_len, 1); + // Set reassembled frame length to zero after processing it + frag[b].re_frame_len = 0; + memset(frag[b].reassembled_frame, 0, sizeof(frag[b].reassembled_frame)); + } + } + ////////////////////////////////////////// + bundle[b].seq_num_m = seq_num; + if (end_frame) + { + // Both bits are set + LOG(4, s, t, "MPPP: Both bits are set (Begin and End).\n"); + processmpframe(s, t, p, l, 0); + // The maximum number of fragments is 1500 + if (seq_num - bundle[b].offset >= 1400) + { + bundle[b].offset = seq_num; + LOG(4, s, t, "MPPP: Setting offset to: %d\n",bundle[b].offset); + } + } + else + { + bundle[b].pending_frag = 1; + // End bit is clear + LOG(4, s, t, "MPPP: Push to receive buffer\n"); + // Push to the receive buffer + // Array indexes checking + if (seq_num-offset < 0 || seq_num-offset >= MAXFRAGNUM) + { + LOG(2, s, t, "ERROR: Index out of range, push to receive buffer(1) seq:%d, offset:%d, bundle:%d\n",seq_num,offset,b); + return; + } + // Perform length checking + if (l > MAXFRAGLEN) + { + LOG(2, s, t, "MPPP: ERROR: very long fragment length (1)\n"); + return; + } + frag[b].fragment[seq_num - offset].length = l; + memcpy(frag[b].fragment[seq_num - offset].data, p, l); + } + } + else + { + LOG(4, s, t, "MPPP: Push to receive buffer\n"); + // Push to the receive buffer + // Array indexes checking + if (seq_num-offset < 0 || seq_num-offset >= MAXFRAGNUM) + { + LOG(2, s, t, "ERROR: Index out of range, push to receive buffer(2) seq:%d, offset:%d, bundle:%d\n",seq_num,offset,b); + return; + } + // Perform length checking + if (l > MAXFRAGLEN) + { + LOG(2, s, t, "MPPP: ERROR: very long fragment length (2).\n"); + return; + } + frag[b].fragment[seq_num - offset].length = l; + memcpy(frag[b].fragment[seq_num - offset].data, p, l); + } +} + // process IPv6 packet received // // This MUST be called with at least 4 byte behind 'p'. @@ -1616,7 +2069,7 @@ void processccp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) STAT(tunnel_rx_errors); } - LOG(3, s, t, "CCP: recv %s\n", ppp_code(*p)); + LOG(4, s, t, "CCP: recv %s\n", ppp_code(*p)); if (*p == ConfigAck) { switch (session[s].ppp.ccp) @@ -1649,13 +2102,13 @@ void processccp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) else // compression requested--reject *p = ConfigRej; - q = makeppp(b, sizeof(b), p, l, s, t, PPPCCP); + q = makeppp(b, sizeof(b), p, l, s, t, PPPCCP, 0, 0, 0); if (!q) return; switch (session[s].ppp.ccp) { case Closed: - q = makeppp(b, sizeof(b), p, 2, s, t, PPPCCP); + q = makeppp(b, sizeof(b), p, 2, s, t, PPPCCP, 0, 0, 0); if (!q) return; *q = TerminateAck; *((uint16_t *) (q + 2)) = htons(l = 4); @@ -1701,13 +2154,13 @@ void processccp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) return; } - LOG(3, s, t, "CCP: send %s\n", ppp_code(*q)); + LOG(4, s, t, "CCP: send %s\n", ppp_code(*q)); tunnelsend(b, l + (q - b), t); } else if (*p == TerminateReq) { *p = TerminateAck; - q = makeppp(b, sizeof(b), p, l, s, t, PPPCCP); + q = makeppp(b, sizeof(b), p, l, s, t, PPPCCP, 0, 0, 0); if (!q) return; LOG(3, s, t, "CCP: send %s\n", ppp_code(*q)); tunnelsend(b, l + (q - b), t); @@ -1747,11 +2200,11 @@ void sendchap(sessionidt s, tunnelidt t) 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, s, t, PPPCHAP); + q = makeppp(b, sizeof(b), 0, 0, s, t, PPPCHAP, 0, 0, 0); if (!q) return; *q = 1; // challenge @@ -1764,39 +2217,87 @@ void sendchap(sessionidt s, tunnelidt t) } // 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, sessionidt s, tunnelidt t, uint16_t mtype) +uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, sessionidt s, tunnelidt t, uint16_t mtype, uint8_t prio, bundleidt bid, uint8_t mp_bits) { - if (size < 12) // Need more space than this!! + uint16_t hdr = 0x0002; // L2TP with no options + uint16_t type = mtype; + uint8_t *start = b; + + if (size < 16) // Need more space than this!! { LOG(0, s, t, "makeppp buffer too small for L2TP header (size=%d)\n", size); return NULL; } - *(uint16_t *) (b + 0) = htons(0x0002); // L2TP with no options + if (prio) hdr |= 0x0100; // set priority bit + + *(uint16_t *) (b + 0) = htons(hdr); *(uint16_t *) (b + 2) = htons(tunnel[t].far); // tunnel *(uint16_t *) (b + 4) = htons(session[s].far); // session b += 6; - if (mtype == PPPLCP || !(session[s].flags & SESSION_ACFC)) + + // Check whether this session is part of multilink + if (bid) + { + if (bundle[bid].num_of_links > 1) + type = PPPMP; // Change PPP message type to the PPPMP + else + bid = 0; + } + + if (type == PPPLCP || !(session[s].flags & SESSION_ACFC)) { *(uint16_t *) b = htons(0xFF03); // HDLC header b += 2; } - if (mtype < 0x100 && session[s].flags & SESSION_PFC) - *b++ = mtype; + + if (type < 0x100 && session[s].flags & SESSION_PFC) + { + *b++ = type; + } else { - *(uint16_t *) b = htons(mtype); + *(uint16_t *) b = htons(type); b += 2; } - if (l + 12 > size) + if (bid) + { + // 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, l + 12); + 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); @@ -1829,16 +2330,16 @@ 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 +// 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, s, t, PPPLCP))) + if (!(q = makeppp(b, sizeof(b), NULL, 0, s, t, PPPLCP, 0, 0, 0))) return; - LOG(3, s, t, "LCP: send ConfigReq%s%s%s\n", + LOG(3, s, t, "LCP: send ConfigReq%s%s%s including MP options\n", authtype ? " (" : "", authtype ? (authtype == AUTHCHAP ? "CHAP" : "PAP") : "", authtype ? ")" : ""); @@ -1858,9 +2359,26 @@ void sendlcp(sessionidt s, tunnelidt t) 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 @@ -1876,7 +2394,7 @@ void sendccp(sessionidt s, tunnelidt t) { uint8_t b[500], *q; - if (!(q = makeppp(b, sizeof(b), NULL, 0, s, t, PPPCCP))) + if (!(q = makeppp(b, sizeof(b), NULL, 0, s, t, PPPCCP, 0, 0, 0))) return; LOG(3, s, t, "CCP: send ConfigReq (no compression)\n"); @@ -1903,7 +2421,7 @@ void protoreject(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint16_t pro l += 6; if (l > mru) l = mru; - q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPLCP); + q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPLCP, 0, 0, 0); if (!q) return; *q = ProtocolRej;