X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/8f970b69377305292619130364fb834e7a7f815d..db276bcc801cbd2662f90a6b22cfc551ecddbf0f:/ppp.c?ds=sidebyside diff --git a/ppp.c b/ppp.c index f70bdf2..7942e6e 100644 --- a/ppp.c +++ b/ppp.c @@ -1,6 +1,6 @@ // L2TPNS PPP Stuff -char const *cvs_id_ppp = "$Id: ppp.c,v 1.103 2007/01/25 12:36:48 bodea Exp $"; +char const *cvs_id_ppp = "$Id: ppp.c,v 1.104 2009/12/08 14:49:28 bodea Exp $"; #include #include @@ -31,6 +31,16 @@ static int epdiscmp(epdist, epdist); static void setepdis(epdist *, epdist); static void ipcp_open(sessionidt s, tunnelidt t); +static int first_session_in_bundle(sessionidt s) +{ + bundleidt i; + 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)) + return 0; + return 1; +} + // Process PAP messages void processpap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) { @@ -140,7 +150,10 @@ void processpap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) radius[r].id = p[1]; LOG(3, s, t, "Sending login for %s/%s to RADIUS\n", user, pass); - radiussend(r, RADIUSAUTH); + if ((session[s].mrru) && (!first_session_in_bundle(s))) + radiussend(r, RADIUSJUSTAUTH); + else + radiussend(r, RADIUSAUTH); } } @@ -257,7 +270,10 @@ void processchap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) radius[r].chap = 1; LOG(3, s, t, "CHAP login %s\n", session[s].user); - radiussend(r, RADIUSAUTH); + if ((session[s].mrru) && (!first_session_in_bundle(s))) + radiussend(r, RADIUSJUSTAUTH); + else + radiussend(r, RADIUSAUTH); } static void dumplcp(uint8_t *p, int l) @@ -366,17 +382,7 @@ void lcp_open(sessionidt s, tunnelidt 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].session_timeout = session[first_ses].session_timeout; - ipcp_open(s, t); - } - else + if(session[s].bundle == 0 || bundle[session[s].bundle].num_of_links == 1) { // This-Layer-Up sendipcp(s, t); @@ -389,6 +395,12 @@ void lcp_open(sessionidt s, tunnelidt t) change_state(s, ccp, Stopped); } + else + { + 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); + ipcp_open(s, t); + } } } @@ -1091,10 +1103,20 @@ int join_bundle(sessionidt s) { if (epdiscmp(session[s].epdis,bundle[i].epdis) && !strcmp(session[s].user, bundle[i].user)) { + sessionidt first_ses = bundle[i].members[0]; + if (bundle[i].mssf != session[s].mssf) + { + // uniformity of sequence number format must be insured + LOG(3, s, session[s].tunnel, "MPPP: unable to bundle session %d in bundle %d cause of different mssf\n", s, i); + return -1; + } session[s].bundle = i; - bundle[i].mrru = session[s].mrru; - bundle[i].mssf = session[s].mssf; - if (session[s].epdis.length > 0) + 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; + + if(session[s].epdis.length > 0) setepdis(&bundle[i].epdis, session[s].epdis); strcpy(bundle[i].user, session[s].user); @@ -1112,11 +1134,19 @@ int join_bundle(sessionidt s) session[s].bundle = b; bundle[b].mrru = session[s].mrru; bundle[b].mssf = session[s].mssf; - if (session[s].epdis.length > 0) + // FIXME !!! to enable l2tpns reading mssf frames receiver_max_seq, sender_max_seq must be introduce + // now session[s].mssf flag indecates that the receiver wish to receive frames in mssf, so max_seq (i.e. recv_max_seq) = 1<<24 + /* + if (bundle[b].mssf) + bundle[b].max_seq = 1 << 12; + else */ + bundle[b].max_seq = 1 << 24; + 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; + bundle[b].timeout = session[s].timeout; LOG(3, s, session[s].tunnel, "MPPP: Created a new bundle (%d)\n", b); return b; } @@ -1148,23 +1178,24 @@ 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 - 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; + 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; } static void ipcp_open(sessionidt s, tunnelidt t) @@ -1645,6 +1676,39 @@ void processipv6cp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) } } +static void update_sessions_in_stat(sessionidt s, uint16_t l) +{ + bundleidt b = session[s].bundle; + if (!b) + { + increment_counter(&session[s].cin, &session[s].cin_wrap, l); + session[s].cin_delta += l; + session[s].pin++; + + sess_local[s].cin += l; + sess_local[s].pin++; + } + else + { + int i = frag[b].re_frame_begin_index; + int end = frag[b].re_frame_end_index; + for (;;) + { + l = frag[b].fragment[i].length; + s = frag[b].fragment[i].sid; + increment_counter(&session[s].cin, &session[s].cin_wrap, l); + session[s].cin_delta += l; + session[s].pin++; + + sess_local[s].cin += l; + sess_local[s].pin++; + if (i == end) + return; + i = (i + 1) & MAXFRAGNUM_MASK; + } + } +} + // process IP packet received // // This MUST be called with at least 4 byte behind 'p'. @@ -1732,12 +1796,7 @@ void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) snoop_send_packet(p, l, session[s].snoop_ip, session[s].snoop_port); } - increment_counter(&session[s].cin, &session[s].cin_wrap, l); - session[s].cin_delta += l; - session[s].pin++; - - sess_local[s].cin += l; - sess_local[s].pin++; + update_sessions_in_stat(s, l); eth_tx += l; @@ -1748,162 +1807,190 @@ void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t 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; - } + bundleidt b = session[s].bundle; + bundlet * this_bundle = &bundle[b]; + uint32_t frag_offset, M_offset; + uint16_t frag_index, M_index; + fragmentationt *this_fragmentation = &frag[b]; + uint8_t begin_frame = (*p & MP_BEGIN); + uint8_t end_frame = (*p & MP_END); + uint32_t seq_num; + uint8_t flags = *p; + uint16_t begin_index, end_index; + + // Perform length checking + if(l > MAXFRAGLEN) + { + LOG(2, s, t, "MPPP: discarding fragment larger than MAXFRAGLEN\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); - } + if(!b) + { + LOG(2, s, t, "MPPP: Invalid bundle id: 0\n"); + return; + } + // FIXME !! session[s].mssf means that the receiver wants to receive frames in mssf not means the receiver will send frames in mssf + /* if(session[s].mssf) + { + // Get 12 bit for seq number + seq_num = ntohs((*(uint16_t *) p) & 0xFF0F); + p += 2; + l -= 2; + // After this point the pointer should be advanced 2 bytes + LOG(3, s, t, "MPPP: 12 bits, sequence number: %d\n",seq_num); + } + else */ + { + // Get 24 bit for seq number + seq_num = ntohl((*(uint32_t *) p) & 0xFFFFFF00); + p += 4; + 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); + } + + // calculate this fragment's offset from the begin seq in the bundle + frag_offset = (seq_num + this_bundle->max_seq - this_fragmentation->start_seq) & (this_bundle->max_seq-1); + + // discard this fragment if frag_offset is bigger that the fragmentation buffer size + if (frag_offset >= MAXFRAGNUM) + { + LOG(3, s, t, "MPPP: Index out of range, received more than MAXFRAGNUM fragment (lost frag) seq:%d, begin_seq:%d, bundle:%d, max:%d\n",seq_num, this_fragmentation->start_seq, b, this_bundle->max_seq); + return; + } + + // update M + sess_local[s].last_seq = seq_num; + if (seq_num < this_fragmentation->M) + this_fragmentation->M = seq_num; 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; + uint32_t i, min = sess_local[(this_bundle->members[0])].last_seq;; + for (i = 1; i < this_bundle->num_of_links; i++) + { + uint32_t s_seq = sess_local[(this_bundle->members[i])].last_seq; + if (s_seq < min) + min = s_seq; + } + this_fragmentation->M = min; + } + + LOG(4, s, t, "MPPP: Setting M to %d\n", this_fragmentation->M); + //calculate M's offset from the begin seq in the bundle + M_offset = (this_fragmentation->M + this_bundle->max_seq - this_fragmentation->start_seq) & (this_bundle->max_seq-1); + + //caculate M's index in the fragment array + M_index = (M_offset + this_fragmentation->start_index) & MAXFRAGNUM_MASK; + + //caculate received fragment's index in the fragment array + frag_index = (frag_offset + this_fragmentation->start_index) & MAXFRAGNUM_MASK; + + //frame with a single fragment + if (begin_frame && end_frame) + { + // process and reset fragmentation + LOG(4, s, t, "MPPP: Both bits are set (Begin and End).\n"); + this_fragmentation->fragment[frag_index].length = l; + this_fragmentation->fragment[frag_index].sid = s; + this_fragmentation->fragment[frag_index].flags = flags; + this_fragmentation->fragment[frag_index].seq = seq_num; + this_fragmentation->re_frame_begin_index = frag_index; + this_fragmentation->re_frame_end_index = frag_index; + processmpframe(s, t, p, l, 0); + this_fragmentation->fragment[frag_index].length = 0; + this_fragmentation->fragment[frag_index].flags = 0; + end_index = frag_index; } - - offset = bundle[b].offset; - if (begin_frame) + else { - // Check for previous non-assembled frames - int error = 0; - if (bundle[b].pending_frag) + // insert the frame in it's place + fragmentt *this_frag = &this_fragmentation->fragment[frag_index]; + this_frag->length = l; + this_frag->sid = s; + this_frag->flags = flags; + this_frag->seq = seq_num; + memcpy(this_frag->data, p, l); + + // try to assemble the frame that has the received fragment as a member + // get the beginning of this frame + begin_index = end_index = frag_index; + while (this_fragmentation->fragment[begin_index].length) { - 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)); - } + if (this_fragmentation->fragment[begin_index].flags & MP_BEGIN) + break; + begin_index = (begin_index ? (begin_index -1) : (MAXFRAGNUM -1)); } - ////////////////////////////////////////// - bundle[b].seq_num_m = seq_num; - if (end_frame) + + // return if a lost fragment is found + if (!(this_fragmentation->fragment[begin_index].length)) + return; // assembling frame failed + // get the end of his frame + while (this_fragmentation->fragment[end_index].length) { - // 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); - } + if (this_fragmentation->fragment[end_index].flags & MP_END) + break; + end_index = (end_index +1) & MAXFRAGNUM_MASK; } - 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) + + // return if a lost fragment is found + if (!(this_fragmentation->fragment[end_index].length)) + return; // assembling frame failed + + // assemble the packet + //assemble frame, process it, reset fragmentation + uint16_t cur_len = 4; // This is set to 4 to leave 4 bytes for function processipin + uint32_t i; + + LOG(4, s, t, "MPPP: processing fragments from %d to %d\n", begin_index, end_index); + // Push to the receive buffer + + for (i = begin_index;; i = (i + 1) & MAXFRAGNUM_MASK) + { + this_frag = &this_fragmentation->fragment[i]; + if(cur_len + this_frag->length > MAXETHER) + { + LOG(2, s, t, "MPPP: discarding reassembled frames larger than MAXETHER\n"); + break; + } + memcpy(this_fragmentation->reassembled_frame+cur_len, this_frag->data, this_frag->length); + LOG(5, s, t, "MPPP: processing frame at %d, with len %d\n", i, this_frag->length); + cur_len += this_frag->length; + if (i == end_index) { - LOG(2, s, t, "MPPP: ERROR: very long fragment length (1)\n"); - return; + this_fragmentation->re_frame_len = cur_len; + this_fragmentation->re_frame_begin_index = begin_index; + this_fragmentation->re_frame_end_index = end_index; + // Process the resassembled frame + LOG(5, s, t, "MPPP: Process the reassembled frame, len=%d\n",cur_len); + processmpframe(s, t, this_fragmentation->reassembled_frame, this_fragmentation->re_frame_len, 1); + break; } - 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) + } + // Set reassembled frame length to zero after processing it + this_fragmentation->re_frame_len = 0; + for (i = begin_index;; i = (i + 1) & MAXFRAGNUM_MASK) { - LOG(2, s, t, "MPPP: ERROR: very long fragment length (2).\n"); - return; + this_fragmentation->fragment[i].length = 0; // Indicates that this fragment has been consumed + this_fragmentation->fragment[i].flags = 0; + if (i == end_index) + break; } - frag[b].fragment[seq_num - offset].length = l; - memcpy(frag[b].fragment[seq_num - offset].data, p, l); } + //discard fragments received before the recently assembled frame + begin_index = this_fragmentation->start_index; + this_fragmentation->start_index = (end_index + 1) & MAXFRAGNUM_MASK; + this_fragmentation->start_seq = (this_fragmentation->fragment[end_index].seq + 1) & (this_bundle->max_seq-1); + //clear length and flags of the discarded fragments + while (begin_index != this_fragmentation->start_index) + { + this_fragmentation->fragment[begin_index].flags = 0; + this_fragmentation->fragment[begin_index].length = 0; + begin_index = (begin_index + 1) & MAXFRAGNUM_MASK; + } + + LOG(4, s, t, "MPPP after assembling: M index is =%d, start index is = %d, start seq=%d\n",M_index, this_fragmentation->start_index, this_fragmentation->start_seq); + return; } // process IPv6 packet received @@ -1989,12 +2076,7 @@ void processipv6in(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l) snoop_send_packet(p, l, session[s].snoop_ip, session[s].snoop_port); } - increment_counter(&session[s].cin, &session[s].cin_wrap, l); - session[s].cin_delta += l; - session[s].pin++; - - sess_local[s].cin += l; - sess_local[s].pin++; + update_sessions_in_stat(s, l); eth_tx += l; @@ -2265,7 +2347,7 @@ uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, sessionidt s, tunnelid { // Set the multilink bits uint16_t bits_send = mp_bits; - *(uint16_t *) b = htons((bundle[bid].seq_num_t & 0xFF0F)|bits_send); + *(uint16_t *) b = htons((bundle[bid].seq_num_t & 0x0FFF)|bits_send); b += 2; } else