X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/6b1075b65c4239e97629f3a891f49f5ae9ef3d4b..bf06c59c60609212d21914c6d130cb28f900baf3:/ppp.c diff --git a/ppp.c b/ppp.c index e627cda..b18840f 100644 --- a/ppp.c +++ b/ppp.c @@ -1,6 +1,6 @@ // L2TPNS PPP Stuff -char const *cvs_id_ppp = "$Id: ppp.c,v 1.39 2004/12/16 08:49:53 bodea Exp $"; +char const *cvs_id_ppp = "$Id: ppp.c,v 1.45 2005/03/10 03:31:25 bodea Exp $"; #include #include @@ -28,11 +28,11 @@ static void initccp(tunnelidt t, sessionidt s); // Process PAP messages void processpap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) { - char user[129]; - char pass[129]; + char user[MAXUSER]; + char pass[MAXPASS]; uint16_t hl; - CSTAT(call_processpap); + CSTAT(processpap); LOG_HEX(5, "PAP", p, l); if (l < 4) @@ -60,13 +60,18 @@ void processpap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) { uint8_t *b = p; b += 4; + user[0] = pass[0] = 0; if (*b && *b < sizeof(user)) + { memcpy(user, b + 1, *b); - user[*b] = 0; - b += 1 + *b; - if (*b && *b < sizeof(pass)) - memcpy(pass, b + 1, *b); - pass[*b] = 0; + user[*b] = 0; + b += 1 + *b; + if (*b && *b < sizeof(pass)) + { + memcpy(pass, b + 1, *b); + pass[*b] = 0; + } + } LOG(3, s, t, "PAP login %s/%s\n", user, pass); } if (session[s].ip || !session[s].radius) @@ -132,16 +137,13 @@ void processchap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) uint16_t r; uint16_t hl; - CSTAT(call_processchap); + CSTAT(processchap); LOG_HEX(5, "CHAP", p, l); r = session[s].radius; if (!r) { LOG(1, s, t, "Unexpected CHAP message\n"); - -// FIXME: Need to drop the session here. - STAT(tunnel_rx_errors); return; } @@ -224,29 +226,13 @@ void processchap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) radiussend(r, RADIUSAUTH); } -static char *ppp_lcp_types[] = { - NULL, - "ConfigReq", - "ConfigAck", - "ConfigNak", - "ConfigRej", - "TerminateReq", - "TerminateAck", - "CodeRej", - "ProtocolRej", - "EchoReq", - "EchoReply", - "DiscardRequest", - "IdentRequest", -}; - static void dumplcp(uint8_t *p, int l) { int x = l - 4; 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_types[(int)*p], ntohs( ((uint16_t *) p)[1]) ); + 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, "Length: %d\n", l); if (*p != ConfigReq && *p != ConfigRej && *p != ConfigAck) return; @@ -271,48 +257,48 @@ static void dumplcp(uint8_t *p, int l) { case 1: // Maximum-Receive-Unit if (length == 4) - LOG(4, 0, 0, " %s %d\n", lcp_types[type], ntohs(*(uint16_t *)(o + 2))); + LOG(4, 0, 0, " %s %d\n", lcp_type(type), ntohs(*(uint16_t *)(o + 2))); else - LOG(4, 0, 0, " %s odd length %d\n", lcp_types[type], length); + LOG(4, 0, 0, " %s odd length %d\n", lcp_type(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_types[type], asyncmap); + LOG(4, 0, 0, " %s %x\n", lcp_type(type), asyncmap); } else - LOG(4, 0, 0, " %s odd length %d\n", lcp_types[type], length); + LOG(4, 0, 0, " %s odd length %d\n", lcp_type(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_types[type], proto, + LOG(4, 0, 0, " %s 0x%x (%s)\n", lcp_type(type), proto, proto == PPPCHAP ? "CHAP" : proto == PPPPAP ? "PAP" : "UNKNOWN"); } else - LOG(4, 0, 0, " %s odd length %d\n", lcp_types[type], length); + LOG(4, 0, 0, " %s odd length %d\n", lcp_type(type), length); break; case 4: // Quality-Protocol { uint32_t qp = ntohl(*(uint32_t *)(o + 2)); - LOG(4, 0, 0, " %s %x\n", lcp_types[type], qp); + LOG(4, 0, 0, " %s %x\n", lcp_type(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_types[type], magicno); + LOG(4, 0, 0, " %s %x\n", lcp_type(type), magicno); } else - LOG(4, 0, 0, " %s odd length %d\n", lcp_types[type], length); + LOG(4, 0, 0, " %s odd length %d\n", lcp_type(type), length); break; case 7: // Protocol-Field-Compression case 8: // Address-And-Control-Field-Compression - LOG(4, 0, 0, " %s\n", lcp_types[type]); + LOG(4, 0, 0, " %s\n", lcp_type(type)); break; default: LOG(2, 0, 0, " Unknown PPP LCP Option type %d\n", type); @@ -331,7 +317,7 @@ void processlcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) uint32_t magicno = 0; uint16_t hl; - CSTAT(call_processlcp); + CSTAT(processlcp); LOG_HEX(5, "LCP", p, l); if (l < 4) @@ -483,7 +469,7 @@ void processlcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) *q = ConfigAck; } - LOG(3, s, t, "Sending %s\n", ppp_lcp_types[*response]); + LOG(3, s, t, "Sending %s\n", ppp_lcp_type(*response)); tunnelsend(b, l + (q - b), t); if (!(session[s].flags & SF_LCP_ACKED)) @@ -508,6 +494,20 @@ void processlcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) { sessionshutdown(s, "Connection closed."); } + else if (*p == ProtocolRej) + { + if (*(uint16_t *) (p+4) == htons(PPPIPV6CP)) + { + LOG(3, s, t, "IPv6 rejected\n"); + session[s].flags |= SF_IPV6_NACKED; + } + else + { + LOG(1, s, t, "Unexpected LCP protocol reject 0x%X\n", + ntohs(*(uint16_t *) (p+4))); + STAT(tunnel_rx_errors); + } + } else if (*p == EchoReq) { LOG(5, s, t, "LCP: Received EchoReq. Sending EchoReply\n"); @@ -567,7 +567,7 @@ void processipcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) { uint16_t hl; - CSTAT(call_processipcp); + CSTAT(processipcp); LOG_HEX(5, "IPCP", p, l); if (l < 5) @@ -701,6 +701,128 @@ void processipcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) } } +// Process IPV6CP messages +void processipv6cp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) +{ + + CSTAT(processipv6cp); + + LOG_HEX(5, "IPV6CP", p, l); + if (l < 4) + { + LOG(1, s, t, "Short IPV6CP %d bytes\n", l); + STAT(tunnel_rx_errors); + return ; + } + if (*p == ConfigAck) + { + // happy with our IPV6CP + session[s].flags |= SF_IPV6CP_ACKED; + + 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; + } + + // Send an initial RA (TODO: Should we send these regularly?) + send_ipv6_ra(t, s, NULL); + return; + } + if (*p != ConfigReq) + { + LOG(1, s, t, "Unexpected IPV6CP code %d\n", *p); + STAT(tunnel_rx_errors); + return; + } + + 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 + } + // form a config reply quoting the IP in the session + { + 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 + } + } +} + // process IP packet received // // This MUST be called with at least 4 byte behind 'p'. @@ -709,7 +831,7 @@ void processipin(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) { in_addr_t ip; - CSTAT(call_processipin); + CSTAT(processipin); LOG_HEX(5, "IP", p, l); @@ -735,15 +857,107 @@ void processipin(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) // Add on the tun header p -= 4; - *(uint32_t *) p = htonl(0x00000800); + *(uint32_t *) p = htonl(PKTIP); + l += 4; + + // Are we throttled and a slave? + if (session[s].tbf_in && !config->cluster_iam_master) { + // Pass it to the master for handling. + master_throttle_packet(session[s].tbf_in, p, l); + return; + } + + // Are we throttled and a master?? + if (session[s].tbf_in && config->cluster_iam_master) { + // Actually handle the throttled packets. + tbf_queue_packet(session[s].tbf_in, p, l); + return; + } + + // send to ethernet + if (tun_write(p, l) < 0) + { + STAT(tun_tx_errors); + LOG(0, s, t, "Error writing %d bytes to TUN device: %s (tunfd=%d, p=%p)\n", + l, strerror(errno), tunfd, p); + + return; + } + + 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); + } + + session[s].cin += l - 4; + session[s].total_cin += l - 4; + sess_local[s].cin += l - 4; + + session[s].pin++; + eth_tx += l - 4; + + STAT(tun_tx_packets); + INC_STAT(tun_tx_bytes, l - 4); +} + +// 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) +{ + struct in6_addr ip; + in_addr_t ipv4; + + CSTAT(processipv6in); + + LOG_HEX(5, "IPv6", p, l); + + ip = *(struct in6_addr *) (p + 8); + ipv4 = ntohl(*(uint32_t *)(p + 16)); + + if (l > MAXETHER) + { + LOG(1, s, t, "IP packet too long %d\n", l); + STAT(tunnel_rx_errors); + return ; + } + + // no spoof + if (ipv4 != session[s].ip && memcmp(&config->ipv6_prefix, &ip, 8) && sessionbyipv6(ip) != s) + { + char str[INET6_ADDRSTRLEN]; + LOG(5, s, t, "Dropping packet with spoofed IP %s\n", + inet_ntop(AF_INET6, &ip, str, INET6_ADDRSTRLEN)); + return; + } + + // Check if it's a Router Solicition message. + if (*(p + 6) == 58 && *(p + 7) == 255 && *(p + 24) == 0xFF && *(p + 25) == 2 && + *(uint32_t *)(p + 26) == 0 && *(uint32_t *)(p + 30) == 0 && + *(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); + return; + } + + // Add on the tun header + p -= 4; + *(uint32_t *) p = htonl(PKTIPV6); l += 4; - if (session[s].tbf_in && !config->cluster_iam_master) { // Are we throttled and a slave? - master_throttle_packet(session[s].tbf_in, p, l); // Pass it to the master for handling. + // Are we throttled and a slave? + if (session[s].tbf_in && !config->cluster_iam_master) { + // Pass it to the master for handling. + master_throttle_packet(session[s].tbf_in, p, l); return; } - if (session[s].tbf_in && config->cluster_iam_master) { // Are we throttled and a master?? actually handle the throttled packets. + // Are we throttled and a master?? + if (session[s].tbf_in && config->cluster_iam_master) { + // Actually handle the throttled packets. tbf_queue_packet(session[s].tbf_in, p, l); return; } @@ -766,7 +980,7 @@ void processipin(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) session[s].cin += l - 4; session[s].total_cin += l - 4; - sess_count[s].cin += l - 4; + sess_local[s].cin += l - 4; session[s].pin++; eth_tx += l - 4; @@ -801,7 +1015,7 @@ void send_ipin(sessionidt s, uint8_t *buf, int len) // Increment packet counters session[s].cin += len - 4; session[s].total_cin += len - 4; - sess_count[s].cin += len - 4; + sess_local[s].cin += len - 4; session[s].pin++; eth_tx += len - 4; @@ -817,7 +1031,7 @@ void processccp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) uint8_t b[MAXCONTROL]; uint8_t *q; - CSTAT(call_processccp); + CSTAT(processccp); LOG_HEX(5, "CCP", p, l); switch (l > 1 ? *p : 0) @@ -869,25 +1083,24 @@ void sendchap(tunnelidt t, sessionidt s) uint16_t r = session[s].radius; uint8_t *q; - CSTAT(call_sendchap); + CSTAT(sendchap); if (!r) { LOG(1, s, t, "No RADIUS to send challenge\n"); STAT(tunnel_tx_errors); - return ; + return; } + LOG(1, s, t, "Send CHAP challenge\n"); - { - // new challenge - int n; - for (n = 0; n < 15; n++) - radius[r].auth[n] = rand(); - } + + // 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) radius[r].try = 0; + radius[r].state = RADIUSCHAP; radius[r].retry = backoff(radius[r].try++); if (radius[r].try > 5)