X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/1c209703a398a3d56d483d25b008f122b437ea65..08360e49b4f9d5a7e9d85e673d1f5014530e006d:/ppp.c diff --git a/ppp.c b/ppp.c index 8e1e844..cdd8a94 100644 --- a/ppp.c +++ b/ppp.c @@ -1,6 +1,6 @@ // L2TPNS PPP Stuff -char const *cvs_id_ppp = "$Id: ppp.c,v 1.41 2005-01-13 07:57:39 bodea Exp $"; +char const *cvs_id_ppp = "$Id: ppp.c,v 1.42 2005-01-25 04:19:06 bodea Exp $"; #include #include @@ -139,9 +139,6 @@ void processchap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) if (!r) { LOG(1, s, t, "Unexpected CHAP message\n"); - -// FIXME: Need to drop the session here. - STAT(tunnel_rx_errors); return; } @@ -492,6 +489,20 @@ 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"); @@ -685,6 +696,128 @@ 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'. @@ -759,6 +892,92 @@ void processipin(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l) 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; + + // 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?? actually handle the throttled + // packets. + if (session[s].tbf_in && config->cluster_iam_master) { + 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); + } + + if (session[s].snoop_ip && session[s].snoop_port) + { + // Snooping this session + 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; + + session[s].pin++; + eth_tx += l - 4; + + STAT(tun_tx_packets); + INC_STAT(tun_tx_bytes, l - 4); +} + // // Helper routine for the TBF filters. // Used to send queued data in from the user.