// L2TPNS PPP Stuff
-char const *cvs_id_ppp = "$Id: ppp.c,v 1.104 2009/12/08 14:49:28 bodea Exp $";
-
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "tbf.h"
#include "cluster.h"
+#ifdef LAC
+#include "l2tplac.h"
+#endif
+#include "pppoe.h"
+
extern tunnelt *tunnel;
extern bundlet *bundle;
extern fragmentationt *frag;
extern char hostname[];
extern uint32_t eth_tx;
extern time_t time_now;
+extern uint64_t time_now_ms;
extern configt *config;
static int add_lcp_auth(uint8_t *b, int size, int authtype);
LOG(3, s, t, "PAP login %s/%s\n", user, pass);
}
+#ifdef LAC
+ if ((!config->disable_lac_func) && lac_conf_forwardtoremotelns(s, user))
+ {
+ // Creating a tunnel/session has been started
+ return;
+ }
+#endif
+
if (session[s].ip || !(r = radiusnew(s)))
{
// respond now, either no RADIUS available or already authenticated
packet.username = calloc(l + 1, 1);
memcpy(packet.username, p, l);
+#ifdef LAC
+ if ((!config->disable_lac_func) && lac_conf_forwardtoremotelns(s, 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)
{
}
}
-static void lcp_restart(sessionidt s)
+void lcp_restart(sessionidt s)
{
session[s].ppp.phase = Establish;
// This-Layer-Down
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);
break;
+ case Closing:
+ sessionshutdown(s, "LCP: ConfigReq in state Closing. This should not happen. Killing session.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
+ break;
+
default:
LOG(2, s, t, "LCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.lcp));
return;
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)
uint8_t *o = p + 4;
int length = l - 4;
int gotip = 0;
- uint8_t ident[8];
+ uint32_t ident[2];
while (length > 2)
{
gotip++; // seen address
if (o[1] != 10) return;
- *(uint32_t *) ident = htonl(session[s].ip);
- *(uint32_t *) (ident + 4) = 0;
+ ident[0] = htonl(session[s].ip);
+ ident[1] = 0;
if (memcmp(o + 2, ident, sizeof(ident)))
{
- q = ppp_conf_nak(s, b, sizeof(b), PPPIPV6CP, &response, q, p, o, ident, sizeof(ident));
+ q = ppp_conf_nak(s, b, sizeof(b), PPPIPV6CP, &response, q, p, o, (uint8_t *)ident, sizeof(ident));
if (!q) return;
}
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;
// process Multilink PPP packet received
void processmpin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
{
- bundleidt b = session[s].bundle;
+ bundleidt b = session[s].bundle;
bundlet * this_bundle = &bundle[b];
- uint32_t frag_offset, M_offset;
- uint16_t frag_index, M_index;
+ uint32_t maskSeq, max_seq;
+ int frag_offset;
+ uint16_t frag_index, frag_index_next, frag_index_prev;
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 end_frame = (*p & MP_END);
+ uint32_t seq_num, seq_num_next, seq_num_prev;
+ uint32_t i;
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;
- }
+ if(l > MAXFRAGLEN)
+ {
+ LOG(2, s, t, "MPPP: discarding fragment larger than MAXFRAGLEN\n");
+ return;
+ }
- if(!b)
- {
- LOG(2, s, t, "MPPP: Invalid bundle id: 0\n");
- return;
- }
+ 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);
- }
+ /* 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);
+ max_seq = this_bundle->max_seq;
+ maskSeq = 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;
- }
+ /*
+ * Expand sequence number to 32 bits, making it as close
+ * as possible to this_fragmentation->M.
+ */
+ seq_num |= this_fragmentation->M & ~maskSeq;
+ if ((int)(this_fragmentation->M - seq_num) > (int)(maskSeq >> 1))
+ {
+ seq_num += maskSeq + 1;
+ }
+ else if ((int)(seq_num - this_fragmentation->M) > (int)(maskSeq >> 1))
+ {
+ seq_num -= maskSeq + 1; /* should never happen */
+ }
+
+ // calculate this fragment's offset from the begin seq in the bundle
+ frag_offset = (int) (seq_num - this_fragmentation->start_seq);
- // update M
sess_local[s].last_seq = seq_num;
+
+ // calculate the jitter average
+ uint32_t ljitter = time_now_ms - sess_local[s].prev_time;
+ if (ljitter > 0)
+ {
+ sess_local[s].jitteravg = (sess_local[s].jitteravg + ljitter)>>1;
+ sess_local[s].prev_time = time_now_ms;
+ }
+
+ uint32_t Mmin;
+
if (seq_num < this_fragmentation->M)
+ {
+ Mmin = seq_num;
this_fragmentation->M = seq_num;
+ }
else
{
- uint32_t i, min = sess_local[(this_bundle->members[0])].last_seq;;
+ Mmin = 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;
+ uint32_t s_seq = sess_local[(this_bundle->members[i])].last_seq;
+ if (s_seq < Mmin)
+ Mmin = s_seq;
}
- this_fragmentation->M = min;
+ this_fragmentation->M = Mmin;
}
- 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);
+ // calculate M offset of the M seq in the bundle
+ int M_offset = (int) (Mmin - this_fragmentation->start_seq);
+
+ if (M_offset >= MAXFRAGNUM)
+ {
+ // 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\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;
+
+ // Set new Start sequence
+ this_fragmentation->start_index = begin_index;
+ this_fragmentation->start_seq = Mmin;
+ M_offset = 0;
+ // recalculate the fragment offset from the new begin seq in the bundle
+ frag_offset = (int) (seq_num - Mmin);
+ }
+
+ // discard this fragment if the packet comes before the start sequence
+ if (frag_offset < 0)
+ {
+ // this packet comes before the next
+ 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;
+ }
+
+ // discard if frag_offset is bigger that the fragmentation buffer size
+ 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\n", seq_num, this_fragmentation->start_seq);
+ return;
+ }
- //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;
+ // insert the frame in it's place
+ fragmentt *this_frag = &this_fragmentation->fragment[frag_index];
+
+ 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:%02X is LOST\n",
+ this_frag->seq, frag_index, this_frag->flags);
+
+ this_frag->length = l;
+ this_frag->sid = s;
+ this_frag->tid = t;
+ this_frag->flags = flags;
+ this_frag->seq = seq_num;
+ this_frag->jitteravg = sess_local[s].jitteravg;
+ memcpy(this_frag->data, p, l);
+
+ LOG(4, s, t, "MPPP: seq_num:%d frag_index:%d INSERTED flags: %02X\n", seq_num, frag_index, flags);
+
+ //next frag index
+ frag_index_next = (frag_index + 1) & MAXFRAGNUM_MASK;
+ //previous frag index
+ frag_index_prev = (frag_index - 1) & MAXFRAGNUM_MASK;
+ // next seq
+ seq_num_next = seq_num + 1;
+ // previous seq
+ seq_num_prev = seq_num - 1;
+
+ // Clean the buffer and log the lost fragments
+ if ((frag_index_next != this_fragmentation->start_index) && this_fragmentation->fragment[frag_index_next].length)
+ {
+ // check if the next frag is a lost fragment
+ if (this_fragmentation->fragment[frag_index_next].seq != seq_num_next)
+ {
+ // 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:%02X is LOST\n",
+ this_fragmentation->fragment[frag_index_next].seq, frag_index_next,
+ 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;
+
+ if (begin_frame && (!end_frame)) return; // assembling frame failed
+ }
}
- else
+
+ // Clean the buffer and log the lost fragments
+ if ((frag_index != this_fragmentation->start_index) && this_fragmentation->fragment[frag_index_prev].length)
{
- // 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)
+ // check if the next frag is a lost fragment
+ if (this_fragmentation->fragment[frag_index_prev].seq != seq_num_prev)
{
- if (this_fragmentation->fragment[begin_index].flags & MP_BEGIN)
- break;
- begin_index = (begin_index ? (begin_index -1) : (MAXFRAGNUM -1));
+ // 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:%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].length = 0;
+ this_fragmentation->fragment[frag_index_prev].flags = 0;
+
+ if (end_frame && (!begin_frame)) return; // assembling frame failed
}
+ }
- // 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)
+find_frame:
+ begin_index = this_fragmentation->start_index;
+ uint32_t b_seq = this_fragmentation->start_seq;
+ // Try to find a Begin sequence from the start_seq sequence to M sequence
+ while (b_seq < Mmin)
+ {
+ if (this_fragmentation->fragment[begin_index].length)
{
- if (this_fragmentation->fragment[end_index].flags & MP_END)
- break;
- end_index = (end_index +1) & MAXFRAGNUM_MASK;
+ if (b_seq == this_fragmentation->fragment[begin_index].seq)
+ {
+ if (this_fragmentation->fragment[begin_index].flags & MP_BEGIN)
+ {
+ int isfoundE = 0;
+ // Adjust the new start sequence and start index
+ this_fragmentation->start_index = begin_index;
+ this_fragmentation->start_seq = b_seq;
+ // Begin Sequence found, now try to found the End Sequence to complete the frame
+ end_index = begin_index;
+ while (b_seq < Mmin)
+ {
+ if (this_fragmentation->fragment[end_index].length)
+ {
+ if (b_seq == this_fragmentation->fragment[end_index].seq)
+ {
+ if (this_fragmentation->fragment[end_index].flags & MP_END)
+ {
+ // The End sequence was found and the frame is complete
+ isfoundE = 1;
+ break;
+ }
+ }
+ else
+ {
+ // 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:%02X is LOST\n",
+ this_fragmentation->fragment[end_index].seq, begin_index,
+ this_fragmentation->fragment[end_index].flags);
+ // this frag is lost
+ this_fragmentation->fragment[end_index].length = 0;
+ this_fragmentation->fragment[end_index].flags = 0;
+ // This frame is not complete find the next Begin
+ break;
+ }
+ }
+ else
+ {
+ // This frame is not complete find the next Begin if exist
+ break;
+ }
+ end_index = (end_index +1) & MAXFRAGNUM_MASK;
+ b_seq++;
+ }
+
+ if (isfoundE)
+ // The End sequence was found and the frame is complete
+ break;
+ else
+ // find the next Begin
+ begin_index = end_index;
+ }
+ }
+ else
+ {
+ // 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:%02X is LOST\n",
+ this_fragmentation->fragment[begin_index].seq, begin_index,
+ this_fragmentation->fragment[begin_index].flags);
+ // this frag is lost
+ this_fragmentation->fragment[begin_index].length = 0;
+ this_fragmentation->fragment[begin_index].flags = 0;
+ }
}
+ begin_index = (begin_index +1) & MAXFRAGNUM_MASK;
+ b_seq++;
+ }
- // return if a lost fragment is found
- if (!(this_fragmentation->fragment[end_index].length))
+assembling_frame:
+ // try to assemble the frame that has the received fragment as a member
+ // get the beginning of this frame
+ begin_index = end_index = this_fragmentation->start_index;
+ if (this_fragmentation->fragment[begin_index].length)
+ {
+ 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;
+ this_fragmentation->start_seq++;
return; // assembling frame failed
+ }
+ }
+ else
+ 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)
- {
- 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;
- }
- }
- // Set reassembled frame length to zero after processing it
- this_fragmentation->re_frame_len = 0;
- for (i = begin_index;; i = (i + 1) & MAXFRAGNUM_MASK)
+ // get the end of his frame
+ while (this_fragmentation->fragment[end_index].length)
+ {
+ if (this_fragmentation->fragment[end_index].flags & MP_END)
+ break;
+
+ end_index = (end_index +1) & MAXFRAGNUM_MASK;
+
+ if (end_index == this_fragmentation->start_index)
+ return; // assembling frame failed
+ }
+
+ // 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
+
+ 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)
{
- this_fragmentation->fragment[i].length = 0; // Indicates that this fragment has been consumed
- this_fragmentation->fragment[i].flags = 0;
- if (i == end_index)
- break;
+ 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)
+ {
+ 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;
}
}
- //discard fragments received before the recently assembled frame
- begin_index = this_fragmentation->start_index;
+
+ // Set reassembled frame length to zero after processing it
+ this_fragmentation->re_frame_len = 0;
+ for (i = begin_index;; i = (i + 1) & MAXFRAGNUM_MASK)
+ {
+ this_fragmentation->fragment[i].length = 0; // Indicates that this fragment has been consumed
+ this_fragmentation->fragment[i].flags = 0;
+ if (i == end_index)
+ break;
+ }
+
+ // Set the new start_index and start_seq
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;
- }
+ this_fragmentation->start_seq = this_fragmentation->fragment[end_index].seq + 1;
+ LOG(4, s, t, "MPPP after assembling: start index is = %d, start seq=%d\n", this_fragmentation->start_index, this_fragmentation->start_seq);
+
+ begin_index = this_fragmentation->start_index;
+ if ((this_fragmentation->fragment[begin_index].length) &&
+ (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:%02X is LOST\n",
+ this_fragmentation->fragment[begin_index].seq, begin_index,
+ this_fragmentation->fragment[begin_index].flags);
+ this_fragmentation->fragment[begin_index].length = 0;
+ this_fragmentation->fragment[begin_index].flags = 0;
+ }
+
+ if (this_fragmentation->start_seq <= Mmin)
+ // It's possible to find other complete frame or lost frame.
+ goto find_frame;
+ else if ((this_fragmentation->fragment[begin_index].length) &&
+ (this_fragmentation->fragment[begin_index].flags & MP_BEGIN))
+ // may be that the next frame is completed
+ goto assembling_frame;
- 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;
}
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",
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);
if ((b - start) + l > size)
{
- LOG(2, s, t, "makeppp would overflow buffer (size=%d, header+payload=%d)\n", size, (b - start) + l);
+ LOG(2, s, t, "makeppp would overflow buffer (size=%d, header+payload=%td)\n", size, (b - start) + l);
return NULL;
}
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;
projects / l2tpns.git / blobdiff