X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/4df24fd868177859ddd778f1f45bc825f6264cfb..1e722029bc405a555e81840c00708084128c5cdd:/ppp.c diff --git a/ppp.c b/ppp.c index 518f6ec..cb39db6 100644 --- a/ppp.c +++ b/ppp.c @@ -1,7 +1,5 @@ // L2TPNS PPP Stuff -//#define LAC - #include #include #include @@ -14,9 +12,8 @@ #include "tbf.h" #include "cluster.h" -#ifdef LAC #include "l2tplac.h" -#endif +#include "pppoe.h" extern tunnelt *tunnel; extern bundlet *bundle; @@ -106,13 +103,11 @@ void processpap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) LOG(3, s, t, "PAP login %s/%s\n", user, pass); } -#ifdef LAC - if (forwardtolns(s, user)) + if ((!config->disable_lac_func) && lac_conf_forwardtoremotelns(s, user)) { - LOG(3, s, t, "Forwarding login for %s to other LNS\n", user); + // Creating a tunnel/session has been started return; } -#endif if (session[s].ip || !(r = radiusnew(s))) { @@ -265,16 +260,13 @@ void processchap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) packet.username = calloc(l + 1, 1); memcpy(packet.username, p, l); -#ifdef LAC - if (forwardtolns(s, packet.username)) + if ((!config->disable_lac_func) && lac_conf_forwardtoremotelns(s, packet.username)) { - LOG(3, s, t, "Forwarding login for %s to other LNS\n", packet.username); - free(packet.username); free(packet.password); + // Creating a tunnel/session has been started return; } -#endif run_plugins(PLUGIN_PRE_AUTH, &packet); if (!packet.continue_auth) @@ -428,7 +420,7 @@ void lcp_open(sessionidt s, tunnelidt t) } } -static void lcp_restart(sessionidt s) +void lcp_restart(sessionidt s) { session[s].ppp.phase = Establish; // This-Layer-Down @@ -561,7 +553,7 @@ void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) if (session[s].die) // going down... return; - LOG((*p == EchoReq || *p == EchoReply) ? 4 : 3, s, t, + LOG(((*p == EchoReq || *p == EchoReply) ? 4 : 3), s, t, "LCP: recv %s\n", ppp_code(*p)); if (config->debug > 3) dumplcp(p, l); @@ -1206,24 +1198,24 @@ static void setepdis(epdist *ep1, epdist ep2) 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 + 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 memset(&frag[i], 0, sizeof(fragmentationt)); - 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; + 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) @@ -1771,7 +1763,7 @@ void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) 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) + if (!config->disable_no_spoof && ip != session[s].ip && sessionbyip(htonl(ip)) != s) { LOG(4, s, t, "Dropping packet with spoofed IP %s\n", fmtaddr(htonl(ip), 0)); return; @@ -1936,7 +1928,7 @@ void processmpin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) { // There have a long break of the link !!!!!!!! // M_offset is bigger that the fragmentation buffer size - LOG(3, s, t, "MPPP: M_offset out of range, min:%d, begin_seq:%d, jitteravg:%d\n", Mmin, this_fragmentation->start_seq, sess_local[s].jitteravg); + LOG(3, s, t, "MPPP: M_offset out of range, min:%d, begin_seq:%d\n", Mmin, this_fragmentation->start_seq); // Calculate the new start index, the previous frag are lost begin_index = (M_offset + this_fragmentation->start_index) & MAXFRAGNUM_MASK; @@ -1953,7 +1945,7 @@ void processmpin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) if (frag_offset < 0) { // this packet comes before the next - LOG(3, s, t, "MPPP: packet comes before the next, seq:%d, begin_seq:%d, size frag:%d\n", seq_num, this_fragmentation->start_seq, l); + LOG(3, s, t, "MPPP: (COMES BEFORE) the next, seq:%d, begin_seq:%d, size_frag:%d, flags:%02X is LOST\n", seq_num, this_fragmentation->start_seq, l, flags); return; } @@ -1961,7 +1953,7 @@ void processmpin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) if (frag_offset >= MAXFRAGNUM) { // frag_offset is bigger that the fragmentation buffer size - LOG(3, s, t, "MPPP: Index out of range, seq:%d, begin_seq:%d, jitteravg:%d\n", seq_num, this_fragmentation->start_seq, sess_local[s].jitteravg); + LOG(3, s, t, "MPPP: Index out of range, seq:%d, begin_seq:%d\n", seq_num, this_fragmentation->start_seq); return; } @@ -1973,8 +1965,8 @@ void processmpin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) if (this_frag->length > 0) // This fragment is lost, It was around the buffer and it was never completed the packet. - LOG(3, this_frag->sid, this_frag->tid, "MPPP: (INSERT) seq_num:%d frag_index:%d flags:%d jitteravg:%d is LOST\n", - this_frag->seq, frag_index, this_frag->flags, this_frag->jitteravg); + LOG(3, this_frag->sid, this_frag->tid, "MPPP: (INSERT) seq_num:%d frag_index:%d flags:%02X is LOST\n", + this_frag->seq, frag_index, this_frag->flags); this_frag->length = l; this_frag->sid = s; @@ -2003,9 +1995,9 @@ void processmpin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) { // This fragment is lost, It was around the buffer and it was never completed the packet. LOG(3, this_fragmentation->fragment[frag_index_next].sid, this_fragmentation->fragment[frag_index_next].tid, - "MPPP: (NEXT) seq_num:%d frag_index:%d flags:%d jitteravg:%d is LOST\n", + "MPPP: (NEXT) seq_num:%d frag_index:%d flags:%02X is LOST\n", this_fragmentation->fragment[frag_index_next].seq, frag_index_next, - this_fragmentation->fragment[frag_index_next].flags, this_fragmentation->fragment[frag_index_next].jitteravg); + this_fragmentation->fragment[frag_index_next].flags); // this frag is lost this_fragmentation->fragment[frag_index_next].length = 0; this_fragmentation->fragment[frag_index_next].flags = 0; @@ -2022,9 +2014,9 @@ void processmpin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) { // This fragment is lost, It was around the buffer and it was never completed the packet. LOG(3, this_fragmentation->fragment[frag_index_prev].sid, this_fragmentation->fragment[frag_index_prev].tid, - "MPPP: (PREV) seq_num:%d frag_index:%d flags:%d jitteravg:%d is LOST\n", + "MPPP: (PREV) seq_num:%d frag_index:%d flags:%02X is LOST\n", this_fragmentation->fragment[frag_index_prev].seq, frag_index_prev, - this_fragmentation->fragment[frag_index_prev].flags, this_fragmentation->fragment[frag_index_prev].jitteravg); + this_fragmentation->fragment[frag_index_prev].flags); this_fragmentation->fragment[frag_index_prev].length = 0; this_fragmentation->fragment[frag_index_prev].flags = 0; @@ -2068,9 +2060,9 @@ find_frame: { // This fragment is lost, it was never completed the packet. LOG(3, this_fragmentation->fragment[end_index].sid, this_fragmentation->fragment[end_index].tid, - "MPPP: (FIND END) seq_num:%d frag_index:%d flags:%d jitteravg:%d is LOST\n", + "MPPP: (FIND END) seq_num:%d frag_index:%d flags:%02X is LOST\n", this_fragmentation->fragment[end_index].seq, begin_index, - this_fragmentation->fragment[end_index].flags, this_fragmentation->fragment[end_index].jitteravg); + this_fragmentation->fragment[end_index].flags); // this frag is lost this_fragmentation->fragment[end_index].length = 0; this_fragmentation->fragment[end_index].flags = 0; @@ -2099,9 +2091,9 @@ find_frame: { // This fragment is lost, it was never completed the packet. LOG(3, this_fragmentation->fragment[begin_index].sid, this_fragmentation->fragment[begin_index].tid, - "MPPP: (FIND BEGIN) seq_num:%d frag_index:%d flags:%d jitteravg:%d is LOST\n", + "MPPP: (FIND BEGIN) seq_num:%d frag_index:%d flags:%02X is LOST\n", this_fragmentation->fragment[begin_index].seq, begin_index, - this_fragmentation->fragment[begin_index].flags, this_fragmentation->fragment[begin_index].jitteravg); + this_fragmentation->fragment[begin_index].flags); // this frag is lost this_fragmentation->fragment[begin_index].length = 0; this_fragmentation->fragment[begin_index].flags = 0; @@ -2119,6 +2111,10 @@ assembling_frame: { if (!(this_fragmentation->fragment[begin_index].flags & MP_BEGIN)) { + LOG(3, this_fragmentation->fragment[begin_index].sid, this_fragmentation->fragment[begin_index].tid, + "MPPP: (NOT BEGIN) seq_num:%d frag_index:%d flags:%02X\n", + this_fragmentation->fragment[begin_index].seq, begin_index, + this_fragmentation->fragment[begin_index].flags); // should occur only after an "M_Offset out of range" // The start sequence must be a begin sequence this_fragmentation->start_index = (begin_index +1) & MAXFRAGNUM_MASK; @@ -2197,9 +2193,9 @@ assembling_frame: (this_fragmentation->fragment[begin_index].seq != this_fragmentation->start_seq)) { LOG(3, this_fragmentation->fragment[begin_index].sid, this_fragmentation->fragment[begin_index].tid, - "MPPP: (START) seq_num:%d frag_index:%d flags:%d jitteravg:%d is LOST\n", + "MPPP: (START) seq_num:%d frag_index:%d flags:%02X is LOST\n", this_fragmentation->fragment[begin_index].seq, begin_index, - this_fragmentation->fragment[begin_index].flags, this_fragmentation->fragment[begin_index].jitteravg); + this_fragmentation->fragment[begin_index].flags); this_fragmentation->fragment[begin_index].length = 0; this_fragmentation->fragment[begin_index].flags = 0; } @@ -2242,7 +2238,7 @@ void processipv6in(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) return; // no spoof - if (ipv4 != session[s].ip && memcmp(&config->ipv6_prefix, &ip, 8) && sessionbyipv6(ip) != s) + 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", @@ -2524,6 +2520,11 @@ uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, sessionidt s, tunnelid uint16_t type = mtype; uint8_t *start = b; + if (t == TUNNEL_ID_PPPOE) + { + return pppoe_makeppp(b, size, p, l, s, t, mtype, prio, bid, mp_bits); + } + if (size < 16) // Need more space than this!! { LOG(0, s, t, "makeppp buffer too small for L2TP header (size=%d)\n", size); @@ -2604,6 +2605,85 @@ uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, sessionidt s, tunnelid return b; } +// fill in a L2TP message with a PPP frame, +// returns start of PPP frame +//(note: THIS ROUTINE CAN WRITES TO p[-28]). +uint8_t *opt_makeppp(uint8_t *p, int l, sessionidt s, tunnelidt t, uint16_t mtype, uint8_t prio, bundleidt bid, uint8_t mp_bits) +{ + uint16_t hdr = 0x0002; // L2TP with no options + uint16_t type = mtype; + uint8_t *b = p; + + if (t == TUNNEL_ID_PPPOE) + { + return opt_pppoe_makeppp(p, l, s, t, mtype, prio, bid, mp_bits); + } + + // 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 (bid) + { + // Add the message type if this fragment has the begin bit set + if (mp_bits & MP_BEGIN) + { + b -= 2; + *(uint16_t *) b = htons(mtype); // Message type + } + + // Set the sequence number and (B)egin (E)nd flags + if (session[s].mssf) + { + // Set the multilink bits + uint16_t bits_send = mp_bits; + b -= 2; + *(uint16_t *) b = htons((bundle[bid].seq_num_t & 0x0FFF)|bits_send); + } + else + { + b -= 4; + *(uint32_t *) b = htonl(bundle[bid].seq_num_t); + // Set the multilink bits + *b = mp_bits; + } + + bundle[bid].seq_num_t++; + } + + if (type < 0x100 && session[s].flags & SESSION_PFC) + { + b--; + *b = type; + } + else + { + b -= 2; + *(uint16_t *) b = htons(type); + } + + if (type == PPPLCP || !(session[s].flags & SESSION_ACFC)) + { + b -= 2; + *(uint16_t *) b = htons(0xFF03); // HDLC header + } + + if (prio) hdr |= 0x0100; // set priority bit + b -= 2; + *(uint16_t *) b = htons(session[s].far); // session + b -= 2; + *(uint16_t *) b = htons(tunnel[t].far); // tunnel + b -= 2; + *(uint16_t *) b = htons(hdr); + + return b; +} + static int add_lcp_auth(uint8_t *b, int size, int authtype) { int len = 0;