Merge branch 'multibind'

[l2tpns.git] / ppp.c

diff --git a/ppp.c b/ppp.c
index 2343ad3..cb39db6 100644 (file)
--- a/ppp.c
+++ b/ppp.c
@@ -12,6 +12,9 @@
 #include "tbf.h"
 #include "cluster.h"
 
 #include "tbf.h"
 #include "cluster.h"
 

+#include "l2tplac.h"
+#include "pppoe.h"
+

 extern tunnelt *tunnel;
 extern bundlet *bundle;
 extern fragmentationt *frag;
 extern tunnelt *tunnel;
 extern bundlet *bundle;
 extern fragmentationt *frag;


@@ -21,6 +24,7 @@ extern int tunfd;
 extern char hostname[];
 extern uint32_t eth_tx;
 extern time_t time_now;
 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);
 extern configt *config;
 
 static int add_lcp_auth(uint8_t *b, int size, int authtype);


@@ -99,6 +103,12 @@ void processpap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
                LOG(3, s, t, "PAP login %s/%s\n", user, pass);
        }
 
                LOG(3, s, t, "PAP login %s/%s\n", user, pass);
        }
 

+       if ((!config->disable_lac_func) && lac_conf_forwardtoremotelns(s, user))
+       {
+               // Creating a tunnel/session has been started
+               return;
+       }
+

        if (session[s].ip || !(r = radiusnew(s)))
        {
                // respond now, either no RADIUS available or already authenticated
        if (session[s].ip || !(r = radiusnew(s)))
        {
                // respond now, either no RADIUS available or already authenticated


@@ -250,6 +260,14 @@ void processchap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
                packet.username = calloc(l + 1, 1);
                memcpy(packet.username, p, l);
 
                packet.username = calloc(l + 1, 1);
                memcpy(packet.username, p, l);
 

+               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;
+               }
+

                run_plugins(PLUGIN_PRE_AUTH, &packet);
                if (!packet.continue_auth)
                {
                run_plugins(PLUGIN_PRE_AUTH, &packet);
                if (!packet.continue_auth)
                {


@@ -402,7 +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
 {
        session[s].ppp.phase = Establish;
        // This-Layer-Down


@@ -535,7 +553,7 @@ void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
        if (session[s].die) // going down...
                return;
 
        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);
                "LCP: recv %s\n", ppp_code(*p));
 
        if (config->debug > 3) dumplcp(p, l);


@@ -1180,24 +1198,24 @@ static void setepdis(epdist *ep1, epdist ep2)
 
 static bundleidt new_bundle()
 {
 
 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));
                        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)
 }
 
 static void ipcp_open(sessionidt s, tunnelidt t)


@@ -1745,7 +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 (!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;
                {
                        LOG(4, s, t, "Dropping packet with spoofed IP %s\n", fmtaddr(htonl(ip), 0));
                        return;


@@ -1876,6 +1894,14 @@ void processmpin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
        
        sess_local[s].last_seq = seq_num;
 
        
        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)
        uint32_t Mmin;
 
        if (seq_num < this_fragmentation->M)


@@ -1919,7 +1945,7 @@ void processmpin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
        if (frag_offset < 0)
        {
                // this packet comes before the next
        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;
        }
 
                return;
        }
 


@@ -1927,7 +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
        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, size frag:%d\n", seq_num, this_fragmentation->start_seq, l);
+               LOG(3, s, t, "MPPP: Index out of range, seq:%d, begin_seq:%d\n", seq_num, this_fragmentation->start_seq);

                return;
        }
 
                return;
        }
 


@@ -1939,13 +1965,15 @@ 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.
 
        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 is LOST\n",
+               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->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->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);
        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);


@@ -1967,8 +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,
                {
                        // 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 is LOST\n",
-                               this_fragmentation->fragment[frag_index_next].seq, frag_index_next, this_fragmentation->fragment[frag_index_next].flags);
+                               "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;
                        // this frag is lost
                        this_fragmentation->fragment[frag_index_next].length = 0;
                        this_fragmentation->fragment[frag_index_next].flags = 0;


@@ -1985,8 +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,
                {
                        // 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 is LOST\n",
-                               this_fragmentation->fragment[frag_index_prev].seq, frag_index_prev, this_fragmentation->fragment[frag_index_prev].flags);
+                               "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;
 
                        this_fragmentation->fragment[frag_index_prev].length = 0;
                        this_fragmentation->fragment[frag_index_prev].flags = 0;


@@ -2030,8 +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,
                                                        {
                                                                // 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 is LOST\n",
-                                                                       this_fragmentation->fragment[end_index].seq, begin_index, this_fragmentation->fragment[end_index].flags);
+                                                                       "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 frag is lost
                                                                this_fragmentation->fragment[end_index].length = 0;
                                                                this_fragmentation->fragment[end_index].flags = 0;


@@ -2060,8 +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,
                        {
                                // 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 is LOST\n",
-                                       this_fragmentation->fragment[begin_index].seq, begin_index, this_fragmentation->fragment[begin_index].flags);
+                                       "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;
                                // this frag is lost
                                this_fragmentation->fragment[begin_index].length = 0;
                                this_fragmentation->fragment[begin_index].flags = 0;


@@ -2072,13 +2104,17 @@ find_frame:
        }
 
 assembling_frame:
        }
 
 assembling_frame:

-       // try to assemble the frame that has the received fragment as a member         
+       // 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))
                {
        // 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;
                        // 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;


@@ -2157,8 +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,
                (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 is LOST\n",
-                               this_fragmentation->fragment[begin_index].seq, begin_index, this_fragmentation->fragment[begin_index].flags);
+                               "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;
        }
                        this_fragmentation->fragment[begin_index].length = 0;
                        this_fragmentation->fragment[begin_index].flags = 0;
        }


@@ -2201,7 +2238,7 @@ void processipv6in(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
                return;
 
        // no spoof
                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",
        {
                char str[INET6_ADDRSTRLEN];
                LOG(5, s, t, "Dropping packet with spoofed IP %s\n",


@@ -2483,6 +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;
 
        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 (size < 16) // Need more space than this!!
        {
                LOG(0, s, t, "makeppp buffer too small for L2TP header (size=%d)\n", size);


@@ -2563,6 +2605,85 @@ uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, sessionidt s, tunnelid
        return b;
 }
 
        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;
 static int add_lcp_auth(uint8_t *b, int size, int authtype)
 {
        int len = 0;