set acct-disconnect-cause from result code AVP if no disconnect cause AVP is present
[l2tpns.git] / l2tpns.c
index 600d753..03e780c 100644 (file)
--- a/l2tpns.c
+++ b/l2tpns.c
@@ -1,10 +1,10 @@
 // L2TP Network Server
 // Adrian Kennard 2002
-// Copyright (c) 2003, 2004, 2005 Optus Internet Engineering
+// Copyright (c) 2003, 2004, 2005, 2006 Optus Internet Engineering
 // Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced
 // vim: sw=8 ts=8
 
-char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.161 2006-04-18 06:00:46 bodea Exp $";
+char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.168 2006-06-22 15:30:29 bodea Exp $";
 
 #include <arpa/inet.h>
 #include <assert.h>
@@ -127,13 +127,13 @@ config_descriptt config_values[] = {
        CONFIG("radius_authtypes", radius_authtypes_s, STRING),
        CONFIG("radius_dae_port", radius_dae_port, SHORT),
        CONFIG("allow_duplicate_users", allow_duplicate_users, BOOL),
+       CONFIG("guest_account", guest_user, STRING),
        CONFIG("bind_address", bind_address, IPv4),
        CONFIG("peer_address", peer_address, IPv4),
        CONFIG("send_garp", send_garp, BOOL),
        CONFIG("throttle_speed", rl_rate, UNSIGNED_LONG),
        CONFIG("throttle_buckets", num_tbfs, INT),
        CONFIG("accounting_dir", accounting_dir, STRING),
-       CONFIG("setuid", target_uid, INT),
        CONFIG("dump_speed", dump_speed, BOOL),
        CONFIG("multi_read_count", multi_read_count, INT),
        CONFIG("scheduler_fifo", scheduler_fifo, BOOL),
@@ -174,6 +174,8 @@ static sessiont shut_acct[8192];
 static sessionidt shut_acct_n = 0;
 
 tunnelt *tunnel = NULL;                        // Array of tunnel structures.
+bundlet *bundle = NULL;                        // Array of bundle structures.
+fragmentationt *frag = NULL;           // Array of fragmentation structures.
 sessiont *session = NULL;              // Array of session structures.
 sessionlocalt *sess_local = NULL;      // Array of local per-session counters.
 radiust *radius = NULL;                        // Array of radius structures.
@@ -203,6 +205,7 @@ static void plugins_done(void);
 static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local);
 static tunnelidt new_tunnel(void);
 static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len);
+static void bundleclear(bundleidt b);
 
 // on slaves, alow BGP to withdraw cleanly before exiting
 #define QUIT_DELAY     5
@@ -1051,6 +1054,56 @@ void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *t
        *(uint16_t *) (tcp + 16) = htons(sum + (sum >> 16));
 }
 
+void processmpframe(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint8_t extra)
+{
+       uint16_t proto;
+       if (extra) {
+               // Skip the four extra bytes
+               p += 4;
+               l -= 4;
+       }
+
+       // Process this frame
+       if (*p & 1)
+       {
+               proto = *p++;
+               l--;
+       }
+       else
+       {
+               proto = ntohs(*(uint16_t *) p);
+               p += 2;
+               l -= 2;
+       }
+
+       if (proto == PPPIP)
+       {
+               if (session[s].die)
+               {
+                       LOG(4, s, t, "MPPP: Session %u is closing.  Don't process PPP packets\n", s);
+                       return;              // closing session, PPP not processed
+               }
+
+               session[s].last_packet = session[s].last_data = time_now;
+               processipin(s, t, p, l);
+       }
+       else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
+       {
+               if (session[s].die)
+               {
+                       LOG(4, s, t, "MPPP: Session %u is closing.  Don't process PPP packets\n", s);
+                       return;              // closing session, PPP not processed
+               }
+
+               session[s].last_packet = session[s].last_data = time_now;
+               processipv6in(s, t, p, l);
+       }
+       else
+       {
+               LOG(2, s, t, "MPPP: Unsupported MP protocol 0x%04X received\n",proto);
+       }
+}
+
 // process outgoing (to tunnel) IP
 //
 static void processipout(uint8_t *buf, int len)
@@ -1063,7 +1116,8 @@ static void processipout(uint8_t *buf, int len)
        uint8_t *data = buf;    // Keep a copy of the originals.
        int size = len;
 
-       uint8_t b[MAXETHER + 20];
+       uint8_t b1[MAXETHER + 20];
+       uint8_t b2[MAXETHER + 20];
 
        CSTAT(processipout);
 
@@ -1114,6 +1168,7 @@ static void processipout(uint8_t *buf, int len)
        }
        t = session[s].tunnel;
        sp = &session[s];
+       sp->last_data = time_now;
 
        // DoS prevention: enforce a maximum number of packets per 0.1s for a session
        if (config->max_packets > 0)
@@ -1183,13 +1238,43 @@ static void processipout(uint8_t *buf, int len)
                return;
        }
 
-       LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
-
        // Add on L2TP header
        {
-               uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIP);
-               if (!p) return;
-               tunnelsend(b, len + (p-b), t); // send it...
+               bundleidt bid = 0;
+               if (session[s].bundle && bundle[session[s].bundle].num_of_links > 1)
+               {
+                       bid = session[s].bundle;
+                       s = bundle[bid].members[bundle[bid].current_ses = ++bundle[bid].current_ses % bundle[bid].num_of_links];
+                       LOG(4, s, t, "MPPP: (1)Session number becomes: %u\n", s);
+                       if (len > 256)
+                       {
+                               // Partition the packet to 2 fragments
+                               uint32_t frag1len = len / 2;
+                               uint32_t frag2len = len - frag1len;
+                               uint8_t *p = makeppp(b1, sizeof(b1), buf, frag1len, s, t, PPPIP, 0, bid, MP_BEGIN);
+                               uint8_t *q;
+
+                               if (!p) return;
+                               tunnelsend(b1, frag1len + (p-b1), t); // send it...
+                               s = bundle[bid].members[bundle[bid].current_ses = ++bundle[bid].current_ses % bundle[bid].num_of_links];
+                               LOG(4, s, t, "MPPP: (2)Session number becomes: %u\n", s);
+                               q = makeppp(b2, sizeof(b2), buf+frag1len, frag2len, s, t, PPPIP, 0, bid, MP_END);
+                               if (!q) return;
+                               tunnelsend(b2, frag2len + (q-b2), t); // send it...
+                       }
+                       else {
+                               // Send it as one frame
+                               uint8_t *p = makeppp(b1, sizeof(b1), buf, len, s, t, PPPIP, 0, bid, MP_BOTH_BITS);
+                               if (!p) return;
+                               tunnelsend(b1, len + (p-b1), t); // send it...
+                       }
+               }
+               else
+               {
+                       uint8_t *p = makeppp(b1, sizeof(b1), buf, len, s, t, PPPIP, 0, 0, 0);
+                       if (!p) return;
+                       tunnelsend(b1, len + (p-b1), t); // send it...
+               }
        }
 
        // Snooping this session, send it to intercept box
@@ -1273,8 +1358,15 @@ static void processipv6out(uint8_t * buf, int len)
                }
                return;
        }
+       if (session[s].bundle && bundle[session[s].bundle].num_of_links > 1)
+       {
+               bundleidt bid = session[s].bundle;
+               s = bundle[bid].members[bundle[bid].current_ses = ++bundle[bid].current_ses % bundle[bid].num_of_links];
+               LOG(3, s, session[s].tunnel, "MPPP: Session number becomes: %u\n", s);
+       }
        t = session[s].tunnel;
        sp = &session[s];
+       sp->last_data = time_now;
 
        // FIXME: add DoS prevention/filters?
 
@@ -1298,7 +1390,7 @@ static void processipv6out(uint8_t * buf, int len)
 
        // Add on L2TP header
        {
-               uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIPV6);
+               uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIPV6, 0, 0, 0);
                if (!p) return;
                tunnelsend(b, len + (p-b), t); // send it...
        }
@@ -1350,7 +1442,7 @@ static void send_ipout(sessionidt s, uint8_t *buf, int len)
 
        // Add on L2TP header
        {
-               uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIP);
+               uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIP, 0, 0, 0);
                if (!p) return;
                tunnelsend(b, len + (p-b), t); // send it...
        }
@@ -1575,7 +1667,7 @@ void sessionshutdown(sessionidt s, char const *reason, int cdn_result, int cdn_e
        if (!session[s].die)
        {
                struct param_kill_session data = { &tunnel[session[s].tunnel], &session[s] };
-               LOG(2, s, session[s].tunnel, "Shutting down session %d: %s\n", s, reason);
+               LOG(2, s, session[s].tunnel, "Shutting down session %u: %s\n", s, reason);
                run_plugins(PLUGIN_KILL_SESSION, &data);
        }
 
@@ -1679,7 +1771,7 @@ void sendipcp(sessionidt s, tunnelidt t)
                session[s].unique_id = last_id;
        }
 
-       q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPCP);
+       q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPCP, 0, 0, 0);
        if (!q) return;
 
        *q = ConfigReq;
@@ -1703,7 +1795,7 @@ void sendipv6cp(sessionidt s, tunnelidt t)
        CSTAT(sendipv6cp);
        LOG(3, s, t, "IPV6CP: send ConfigReq\n");
 
-       q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPV6CP);
+       q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPV6CP, 0, 0, 0);
        if (!q) return;
 
        *q = ConfigReq;
@@ -1735,6 +1827,7 @@ static void sessionclear(sessionidt s)
 // kill a session now
 void sessionkill(sessionidt s, char *reason)
 {
+       bundleidt b;
 
        CSTAT(sessionkill);
 
@@ -1743,7 +1836,7 @@ void sessionkill(sessionidt s, char *reason)
 
        if (session[s].next)
        {
-               LOG(0, s, session[s].tunnel, "Tried to kill a session with next pointer set (%d)\n", session[s].next);
+               LOG(0, s, session[s].tunnel, "Tried to kill a session with next pointer set (%u)\n", session[s].next);
                return;
        }
 
@@ -1752,7 +1845,39 @@ void sessionkill(sessionidt s, char *reason)
        if (sess_local[s].radius)
                radiusclear(sess_local[s].radius, s); // cant send clean accounting data, session is killed
 
-       LOG(2, s, session[s].tunnel, "Kill session %d (%s): %s\n", s, session[s].user, reason);
+       LOG(2, s, session[s].tunnel, "Kill session %u (%s): %s\n", s, session[s].user, reason);
+       if ((b = session[s].bundle))
+       {
+               // This session was part of a bundle
+               bundle[b].num_of_links--;
+               LOG(3, s, 0, "MPPP: Dropping member link: %u from bundle %u\n", s, b);
+               if (bundle[b].num_of_links == 0)
+               {
+                       bundleclear(b);
+                       LOG(3, s, 0, "MPPP: Kill bundle: %u (No remaing member links)\n", b);
+               }
+               else
+               {
+                       // Adjust the members array to accomodate the new change
+                       uint8_t mem_num = 0;
+                       // It should be here num_of_links instead of num_of_links-1 (previous instruction "num_of_links--")
+                       if (bundle[b].members[bundle[b].num_of_links] != s)
+                       {
+                               uint8_t ml;
+                               for (ml = 0; ml<bundle[b].num_of_links; ml++)
+                               {
+                                       if (bundle[b].members[ml] == s)
+                                       {
+                                               mem_num = ml;
+                                               break;
+                                       }
+                               }
+                               bundle[b].members[mem_num] = bundle[b].members[bundle[b].num_of_links];
+                               LOG(3, s, 0, "MPPP: Adjusted member links array\n");
+                       }
+               }
+               cluster_send_bundle(b);
+       }
        sessionclear(s);
        cluster_send_session(s);
 }
@@ -1764,6 +1889,13 @@ static void tunnelclear(tunnelidt t)
        tunnel[t].state = TUNNELFREE;
 }
 
+static void bundleclear(bundleidt b)
+{
+       if (!b) return;
+       memset(&bundle[b], 0, sizeof(bundle[b]));
+       bundle[b].state = BUNDLEFREE;
+}
+
 // kill a tunnel now
 static void tunnelkill(tunnelidt t, char *reason)
 {
@@ -1790,7 +1922,7 @@ static void tunnelkill(tunnelidt t, char *reason)
 
        // free tunnel
        tunnelclear(t);
-       LOG(1, 0, t, "Kill tunnel %d: %s\n", t, reason);
+       LOG(1, 0, t, "Kill tunnel %u: %s\n", t, reason);
        cli_tunnel_actions[t].action = 0;
        cluster_send_tunnel(t);
 }
@@ -1808,7 +1940,7 @@ static void tunnelshutdown(tunnelidt t, char *reason, int result, int error, cha
                tunnelkill(t, reason);
                return;
        }
-       LOG(1, 0, t, "Shutting down tunnel %d (%s)\n", t, reason);
+       LOG(1, 0, t, "Shutting down tunnel %u (%s)\n", t, reason);
 
        // close session
        for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
@@ -1871,7 +2003,7 @@ void processudp(uint8_t *buf, int len, struct sockaddr_in *addr)
        }
        if ((buf[1] & 0x0F) != 2)
        {
-               LOG(1, 0, 0, "Bad L2TP ver %d\n", (buf[1] & 0x0F) != 2);
+               LOG(1, 0, 0, "Bad L2TP ver %d\n", buf[1] & 0x0F);
                STAT(tunnel_rx_errors);
                return;
        }
@@ -1968,7 +2100,7 @@ void processudp(uint8_t *buf, int len, struct sockaddr_in *addr)
                        }
                }
 
-               LOG(3, s, t, "Control message (%d bytes): (unacked %d) l-ns %d l-nr %d r-ns %d r-nr %d\n",
+               LOG(3, s, t, "Control message (%d bytes): (unacked %d) l-ns %u l-nr %u r-ns %u r-nr %u\n",
                        l, tunnel[t].controlc, tunnel[t].ns, tunnel[t].nr, ns, nr);
 
                // if no tunnel specified, assign one
@@ -1985,7 +2117,7 @@ void processudp(uint8_t *buf, int len, struct sockaddr_in *addr)
                        tunnel[t].port = ntohs(addr->sin_port);
                        tunnel[t].window = 4; // default window
                        STAT(tunnel_created);
-                       LOG(1, 0, t, "   New tunnel from %s:%u ID %d\n",
+                       LOG(1, 0, t, "   New tunnel from %s:%u ID %u\n",
                                fmtaddr(htonl(tunnel[t].ip), 0), tunnel[t].port, t);
                }
 
@@ -1999,7 +2131,7 @@ void processudp(uint8_t *buf, int len, struct sockaddr_in *addr)
                {
                        // is this the sequence we were expecting?
                        STAT(tunnel_rx_errors);
-                       LOG(1, 0, t, "   Out of sequence tunnel %d, (%d is not the expected %d)\n",
+                       LOG(1, 0, t, "   Out of sequence tunnel %u, (%u is not the expected %u)\n",
                                t, ns, tunnel[t].nr);
 
                        if (l)  // Is this not a ZLB?
@@ -2052,9 +2184,10 @@ void processudp(uint8_t *buf, int len, struct sockaddr_in *addr)
                        int error = 0;
                        char *msg = 0;
 
-                       // default disconnect cause/message on receipt
-                       // of CDN (set to more specific value from
-                       // attribute 46 if present below).
+                       // Default disconnect cause/message on receipt of CDN.  Set to
+                       // more specific value from attribute 1 (result code) or 46
+                       // (disconnect cause) if present below.
+                       int disc_cause_set = 0;
                        int disc_cause = TERM_NAS_REQUEST;
                        char const *disc_reason = "Closed (Received CDN).";
 
@@ -2086,7 +2219,7 @@ void processudp(uint8_t *buf, int len, struct sockaddr_in *addr)
                                b += 2;
                                if (*(uint16_t *) (b))
                                {
-                                       LOG(2, s, t, "Unknown AVP vendor %d\n", ntohs(*(uint16_t *) (b)));
+                                       LOG(2, s, t, "Unknown AVP vendor %u\n", ntohs(*(uint16_t *) (b)));
                                        fatal = flags;
                                        result = 2; // general error
                                        error = 6; // generic vendor-specific error
@@ -2151,7 +2284,7 @@ void processudp(uint8_t *buf, int len, struct sockaddr_in *addr)
                                        n = orig_len;
                                }
 
-                               LOG(4, s, t, "   AVP %d (%s) len %d%s%s\n", mtype, l2tp_avp_name(mtype), n,
+                               LOG(4, s, t, "   AVP %u (%s) len %d%s%s\n", mtype, l2tp_avp_name(mtype), n,
                                        flags & 0x40 ? ", hidden" : "", flags & 0x80 ? ", mandatory" : "");
 
                                switch (mtype)
@@ -2159,37 +2292,53 @@ void processudp(uint8_t *buf, int len, struct sockaddr_in *addr)
                                case 0:     // message type
                                        message = ntohs(*(uint16_t *) b);
                                        mandatory = flags & 0x80;
-                                       LOG(4, s, t, "   Message type = %d (%s)\n", *b, l2tp_code(message));
+                                       LOG(4, s, t, "   Message type = %u (%s)\n", *b, l2tp_code(message));
                                        break;
                                case 1:     // result code
                                        {
                                                uint16_t rescode = ntohs(*(uint16_t *) b);
-                                               const char* resdesc = "(unknown)";
+                                               char const *resdesc = "(unknown)";
+                                               char const *errdesc = NULL;
+                                               int cause = 0;
+
                                                if (message == 4)
                                                { /* StopCCN */
                                                        resdesc = l2tp_stopccn_result_code(rescode);
+                                                       cause = TERM_LOST_SERVICE;
                                                }
                                                else if (message == 14)
                                                { /* CDN */
                                                        resdesc = l2tp_cdn_result_code(rescode);
+                                                       if (rescode == 1)
+                                                               cause = TERM_LOST_CARRIER;
+                                                       else
+                                                               cause = TERM_ADMIN_RESET;
                                                }
 
-                                               LOG(4, s, t, "   Result Code %d: %s\n", rescode, resdesc);
+                                               LOG(4, s, t, "   Result Code %u: %s\n", rescode, resdesc);
                                                if (n >= 4)
                                                {
                                                        uint16_t errcode = ntohs(*(uint16_t *)(b + 2));
-                                                       LOG(4, s, t, "   Error Code %d: %s\n", errcode, l2tp_error_code(errcode));
+                                                       errdesc = l2tp_error_code(errcode);
+                                                       LOG(4, s, t, "   Error Code %u: %s\n", errcode, errdesc);
                                                }
                                                if (n > 4)
                                                        LOG(4, s, t, "   Error String: %.*s\n", n-4, b+4);
 
+                                               if (cause && disc_cause_set < mtype) // take cause from attrib 46 in preference
+                                               {
+                                                       disc_cause_set = mtype;
+                                                       disc_reason = errdesc ? errdesc : resdesc;
+                                                       disc_cause = cause;
+                                               }
+
                                                break;
                                        }
                                        break;
                                case 2:     // protocol version
                                        {
                                                version = ntohs(*(uint16_t *) (b));
-                                               LOG(4, s, t, "   Protocol version = %d\n", version);
+                                               LOG(4, s, t, "   Protocol version = %u\n", version);
                                                if (version && version != 0x0100)
                                                {   // allow 0.0 and 1.0
                                                        LOG(1, s, t, "   Bad protocol version %04X\n", version);
@@ -2223,13 +2372,13 @@ void processudp(uint8_t *buf, int len, struct sockaddr_in *addr)
                                        break;
                                case 9:     // assigned tunnel
                                        tunnel[t].far = ntohs(*(uint16_t *) (b));
-                                       LOG(4, s, t, "   Remote tunnel id = %d\n", tunnel[t].far);
+                                       LOG(4, s, t, "   Remote tunnel id = %u\n", tunnel[t].far);
                                        break;
                                case 10:    // rx window
                                        tunnel[t].window = ntohs(*(uint16_t *) (b));
                                        if (!tunnel[t].window)
                                                tunnel[t].window = 1; // window of 0 is silly
-                                       LOG(4, s, t, "   rx window = %d\n", tunnel[t].window);
+                                       LOG(4, s, t, "   rx window = %u\n", tunnel[t].window);
                                        break;
                                case 11:        // Challenge
                                        {
@@ -2244,17 +2393,17 @@ void processudp(uint8_t *buf, int len, struct sockaddr_in *addr)
 
                                case 14:    // assigned session
                                        asession = session[s].far = ntohs(*(uint16_t *) (b));
-                                       LOG(4, s, t, "   assigned session = %d\n", asession);
+                                       LOG(4, s, t, "   assigned session = %u\n", asession);
                                        break;
                                case 15:    // call serial number
-                                       LOG(4, s, t, "   call serial number = %d\n", ntohl(*(uint32_t *)b));
+                                       LOG(4, s, t, "   call serial number = %u\n", ntohl(*(uint32_t *)b));
                                        break;
                                case 18:    // bearer type
-                                       LOG(4, s, t, "   bearer type = %d\n", ntohl(*(uint32_t *)b));
+                                       LOG(4, s, t, "   bearer type = %u\n", ntohl(*(uint32_t *)b));
                                        // TBA - for RADIUS
                                        break;
                                case 19:    // framing type
-                                       LOG(4, s, t, "   framing type = %d\n", ntohl(*(uint32_t *)b));
+                                       LOG(4, s, t, "   framing type = %u\n", ntohl(*(uint32_t *)b));
                                        // TBA
                                        break;
                                case 21:    // called number
@@ -2308,7 +2457,7 @@ void processudp(uint8_t *buf, int len, struct sockaddr_in *addr)
                                case 29:    // Proxy Authentication Type
                                        {
                                                uint16_t atype = ntohs(*(uint16_t *)b);
-                                               LOG(4, s, t, "   Proxy Auth Type %d (%s)\n", atype, ppp_auth_type(atype));
+                                               LOG(4, s, t, "   Proxy Auth Type %u (%s)\n", atype, ppp_auth_type(atype));
                                                break;
                                        }
                                case 30:    // Proxy Authentication Name
@@ -2328,7 +2477,7 @@ void processudp(uint8_t *buf, int len, struct sockaddr_in *addr)
                                case 32:    // Proxy Authentication ID
                                        {
                                                uint16_t authid = ntohs(*(uint16_t *)(b));
-                                               LOG(4, s, t, "   Proxy Auth ID (%d)\n", authid);
+                                               LOG(4, s, t, "   Proxy Auth ID (%u)\n", authid);
                                                break;
                                        }
                                case 33:    // Proxy Authentication Response
@@ -2374,6 +2523,8 @@ void processudp(uint8_t *buf, int len, struct sockaddr_in *addr)
                                                        "(code=%u, proto=%04X, dir=%u, msg=\"%.*s\")\n",
                                                        code, proto, dir, n - 5, b + 5);
 
+                                               disc_cause_set = mtype;
+
                                                switch (code)
                                                {
                                                case 1: // admin disconnect
@@ -2444,7 +2595,7 @@ void processudp(uint8_t *buf, int len, struct sockaddr_in *addr)
                                default:
                                        {
                                                static char e[] = "unknown AVP 0xXXXX";
-                                               LOG(2, s, t, "   Unknown AVP type %d\n", mtype);
+                                               LOG(2, s, t, "   Unknown AVP type %u\n", mtype);
                                                fatal = flags;
                                                result = 2; // general error
                                                error = 8; // unknown mandatory AVP
@@ -2514,8 +2665,8 @@ void processudp(uint8_t *buf, int len, struct sockaddr_in *addr)
                                                session[s].opened = time_now;
                                                session[s].tunnel = t;
                                                session[s].far = asession;
-                                               session[s].last_packet = time_now;
-                                               LOG(3, s, t, "New session (%d/%d)\n", tunnel[t].far, session[s].far);
+                                               session[s].last_packet = session[s].last_data = time_now;
+                                               LOG(3, s, t, "New session (%u/%u)\n", tunnel[t].far, session[s].far);
                                                control16(c, 14, s, 1); // assigned session
                                                controladd(c, asession, t); // send the reply
 
@@ -2556,6 +2707,11 @@ void processudp(uint8_t *buf, int len, struct sockaddr_in *addr)
                                        // start LCP
                                        sess_local[s].lcp_authtype = config->radius_authprefer;
                                        sess_local[s].ppp_mru = MRU;
+
+                                       // Set multilink options before sending initial LCP packet
+                                       sess_local[s].mp_mrru = 1614;
+                                       sess_local[s].mp_epdis = config->bind_address ? config->bind_address : my_address;
+
                                        sendlcp(s, t);
                                        change_state(s, lcp, RequestSent);
                                        break;
@@ -2572,7 +2728,7 @@ void processudp(uint8_t *buf, int len, struct sockaddr_in *addr)
                                        if (mandatory)
                                                tunnelshutdown(t, "Unknown message type", 2, 6, "unknown message type");
                                        else
-                                               LOG(1, s, t, "Unknown message type %d\n", message);
+                                               LOG(1, s, t, "Unknown message type %u\n", message);
                                        break;
                                }
                        if (chapresponse) free(chapresponse);
@@ -2666,11 +2822,11 @@ void processudp(uint8_t *buf, int len, struct sockaddr_in *addr)
                {
                        if (session[s].die)
                        {
-                               LOG(4, s, t, "Session %d is closing.  Don't process PPP packets\n", s);
+                               LOG(4, s, t, "Session %u is closing.  Don't process PPP packets\n", s);
                                return;              // closing session, PPP not processed
                        }
 
-                       session[s].last_packet = time_now;
+                       session[s].last_packet = session[s].last_data = time_now;
                        if (session[s].walled_garden && !config->cluster_iam_master)
                        {
                                master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
@@ -2679,15 +2835,32 @@ void processudp(uint8_t *buf, int len, struct sockaddr_in *addr)
 
                        processipin(s, t, p, l);
                }
+               else if (proto == PPPMP)
+               {
+                       if (session[s].die)
+                       {
+                               LOG(4, s, t, "Session %u is closing.  Don't process PPP packets\n", s);
+                               return;              // closing session, PPP not processed
+                       }
+
+                       session[s].last_packet = session[s].last_data = time_now;
+                       if (session[s].walled_garden && !config->cluster_iam_master)
+                       {
+                               master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
+                               return;
+                       }
+
+                       processmpin(s, t, p, l);
+               }
                else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
                {
                        if (session[s].die)
                        {
-                               LOG(4, s, t, "Session %d is closing.  Don't process PPP packets\n", s);
+                               LOG(4, s, t, "Session %u is closing.  Don't process PPP packets\n", s);
                                return;              // closing session, PPP not processed
                        }
 
-                       session[s].last_packet = time_now;
+                       session[s].last_packet = session[s].last_data = time_now;
                        if (session[s].walled_garden && !config->cluster_iam_master)
                        {
                                master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
@@ -2873,6 +3046,37 @@ static void regular_cleanups(double period)
                        continue;
                }
 
+               // check for timed out sessions
+               if (session[s].timeout)
+               {
+                       bundleidt bid = session[s].bundle;
+                       if (bid)
+                       {
+                               clockt curr_time = time_now;
+                               if (curr_time - bundle[bid].last_check >= 1)
+                               {
+                                       bundle[bid].online_time += (curr_time-bundle[bid].last_check)*bundle[bid].num_of_links;
+                                       bundle[bid].last_check = curr_time;
+                                       if (bundle[bid].online_time >= session[s].timeout)
+                                       {
+                                               int ses;
+                                               for (ses = bundle[bid].num_of_links - 1; ses >= 0; ses--)
+                                               {
+                                                       sessionshutdown(bundle[bid].members[ses], "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
+                                                       s_actions++;
+                                                       continue;
+                                               }
+                                       }
+                               }
+                       }
+                       else if (session[s].timeout <= time_now - session[s].opened)
+                       {
+                               sessionshutdown(s, "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
+                               s_actions++;
+                               continue;
+                       }
+               }
+
                // PPP timeouts
                if (sess_local[s].lcp.restart <= time_now)
                {
@@ -2999,7 +3203,7 @@ static void regular_cleanups(double period)
                {
                        uint8_t b[MAXETHER];
 
-                       uint8_t *q = makeppp(b, sizeof(b), 0, 0, s, session[s].tunnel, PPPLCP);
+                       uint8_t *q = makeppp(b, sizeof(b), 0, 0, s, session[s].tunnel, PPPLCP, 1, 0, 0);
                        if (!q) continue;
 
                        *q = EchoReq;
@@ -3014,6 +3218,24 @@ static void regular_cleanups(double period)
                        s_actions++;
                }
 
+               // Drop sessions who have reached session_timeout seconds
+               if (session[s].session_timeout && (time_now - session[s].opened >= session[s].session_timeout))
+               {
+                       sessionshutdown(s, "Session Timeout Reached", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
+                       STAT(session_timeout);
+                       s_actions++;
+                       continue;
+               }
+
+               // Drop sessions who have reached idle_timeout seconds
+               if (session[s].last_data && session[s].idle_timeout && (time_now - session[s].last_data >= session[s].idle_timeout))
+               {
+                       sessionshutdown(s, "Idle Timeout Reached", CDN_ADMIN_DISC, TERM_IDLE_TIMEOUT);
+                       STAT(session_timeout);
+                       s_actions++;
+                       continue;
+               }
+
                // Check for actions requested from the CLI
                if ((a = cli_session_actions[s].action))
                {
@@ -3038,7 +3260,7 @@ static void regular_cleanups(double period)
                        }
                        else if (a & CLI_SESS_SNOOP)
                        {
-                               LOG(2, s, session[s].tunnel, "Snooping session by CLI (to %s:%d)\n",
+                               LOG(2, s, session[s].tunnel, "Snooping session by CLI (to %s:%u)\n",
                                    fmtaddr(cli_session_actions[s].snoop_ip, 0),
                                    cli_session_actions[s].snoop_port);
 
@@ -3181,7 +3403,7 @@ static int still_busy(void)
 
                if (last_talked != TIME)
                {
-                       LOG(2, 0, 0, "Tunnel %d still has un-acked control messages.\n", i);
+                       LOG(2, 0, 0, "Tunnel %u still has un-acked control messages.\n", i);
                        last_talked = TIME;
                }
                return 1;
@@ -3203,7 +3425,7 @@ static int still_busy(void)
 
                if (last_talked != TIME)
                {
-                       LOG(2, 0, 0, "Radius session %d is still busy (sid %d)\n", i, radius[i].session);
+                       LOG(2, 0, 0, "Radius session %u is still busy (sid %u)\n", i, radius[i].session);
                        last_talked = TIME;
                }
                return 1;
@@ -3255,9 +3477,12 @@ static void mainloop(void)
                e.events = EPOLLIN;
                i = 0;
 
-               d[i].type = FD_TYPE_CLI;
-               e.data.ptr = &d[i++];
-               epoll_ctl(epollfd, EPOLL_CTL_ADD, clifd, &e);
+               if (clifd >= 0)
+               {
+                       d[i].type = FD_TYPE_CLI;
+                       e.data.ptr = &d[i++];
+                       epoll_ctl(epollfd, EPOLL_CTL_ADD, clifd, &e);
+               }
 
                d[i].type = FD_TYPE_CLUSTER;
                e.data.ptr = &d[i++];
@@ -3711,6 +3936,16 @@ static void initdata(int optdebug, char *optconfig)
                LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno));
                exit(1);
        }
+       if (!(bundle = shared_malloc(sizeof(bundlet) * MAXBUNDLE)))
+       {
+               LOG(0, 0, 0, "Error doing malloc for bundles: %s\n", strerror(errno));
+               exit(1);
+       }
+       if (!(frag = shared_malloc(sizeof(fragmentationt) * MAXBUNDLE)))
+       {
+               LOG(0, 0, 0, "Error doing malloc for fragmentations: %s\n", strerror(errno));
+               exit(1);
+       }
        if (!(session = shared_malloc(sizeof(sessiont) * MAXSESSION)))
        {
                LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno));
@@ -3757,6 +3992,7 @@ static void initdata(int optdebug, char *optconfig)
        memset(cli_tunnel_actions, 0, sizeof(struct cli_tunnel_actions) * MAXSESSION);
 
        memset(tunnel, 0, sizeof(tunnelt) * MAXTUNNEL);
+       memset(bundle, 0, sizeof(bundlet) * MAXBUNDLE);
        memset(session, 0, sizeof(sessiont) * MAXSESSION);
        memset(radius, 0, sizeof(radiust) * MAXRADIUS);
        memset(ip_address_pool, 0, sizeof(ippoolt) * MAXIPPOOL);
@@ -3774,6 +4010,10 @@ static void initdata(int optdebug, char *optconfig)
        for (i = 1; i < MAXTUNNEL; i++)
                tunnel[i].state = TUNNELUNDEF;  // mark it as not filled in.
 
+       for (i = 1; i < MAXBUNDLE; i++) {
+               bundle[i].state = BUNDLEUNDEF;
+       }
+
        if (!*hostname)
        {
                // Grab my hostname unless it's been specified
@@ -3908,7 +4148,7 @@ void rebuild_address_pool(void)
                        if (ipid < 1)                   // Not found in the pool either? good.
                                continue;
 
-                       LOG(0, i, 0, "Session %d has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
+                       LOG(0, i, 0, "Session %u has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
                                i, fmtaddr(session[i].ip, 0), ipid);
 
                        // Fall through and process it as part of the pool.
@@ -3917,7 +4157,7 @@ void rebuild_address_pool(void)
 
                if (ipid > MAXIPPOOL || ipid < 0)
                {
-                       LOG(0, i, 0, "Session %d has a pool IP that's not found in the pool! (%d)\n", i, ipid);
+                       LOG(0, i, 0, "Session %u has a pool IP that's not found in the pool! (%d)\n", i, ipid);
                        ipid = -1;
                        session[i].ip_pool_index = ipid;
                        continue;
@@ -4065,7 +4305,7 @@ void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, ui
        snoop_addr.sin_addr.s_addr = destination;
        snoop_addr.sin_port = ntohs(port);
 
-       LOG(5, 0, 0, "Snooping %d byte packet to %s:%d\n", size,
+       LOG(5, 0, 0, "Snooping %d byte packet to %s:%u\n", size,
                fmtaddr(snoop_addr.sin_addr.s_addr, 0),
                htons(snoop_addr.sin_port));
 
@@ -4200,7 +4440,7 @@ int main(int argc, char *argv[])
        init_tbf(config->num_tbfs);
 
        LOG(0, 0, 0, "L2TPNS version " VERSION "\n");
-       LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005 Optus Internet Engineering\n");
+       LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005, 2006 Optus Internet Engineering\n");
        LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
        {
                struct rlimit rlim;
@@ -4272,10 +4512,6 @@ int main(int argc, char *argv[])
                        LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno));
        }
 
-       // Drop privileges here
-       if (config->target_uid > 0 && geteuid() == 0)
-               setuid(config->target_uid);
-
        mainloop();
 
        /* remove plugins (so cleanup code gets run) */
@@ -4598,6 +4834,14 @@ int sessionsetup(sessionidt s, tunnelidt t)
        // Make sure this is right
        session[s].tunnel = t;
 
+       // Join a bundle if the MRRU option is accepted
+       if (session[s].mrru > 0 && !session[s].bundle)
+       {
+               LOG(3, s, t, "This session can be part of multilink bundle\n");
+               if (join_bundle(s))
+                       cluster_send_bundle(session[s].bundle);
+       }
+
        // zap old sessions with same IP and/or username
        // Don't kill gardened sessions - doing so leads to a DoS
        // from someone who doesn't need to know the password
@@ -4614,8 +4858,21 @@ int sessionsetup(sessionidt s, tunnelidt t)
                                continue;
                        }
 
-                       if (config->allow_duplicate_users) continue;
-                       if (session[s].walled_garden || session[i].walled_garden) continue;
+                       if (config->allow_duplicate_users)
+                               continue;
+
+                       if (session[s].walled_garden || session[i].walled_garden)
+                               continue;
+
+                       // Allow duplicate sessions for guest account.
+                       if (*config->guest_user && !strcasecmp(user, config->guest_user))
+                               continue;
+
+                       // Allow duplicate sessions for multilink ones of the same bundle.
+                       if (session[s].bundle && session[i].bundle && session[s].bundle == session[i].bundle)
+                               continue;
+
+                       // Drop the new session in case of duplicate sessionss, not the old one.
                        if (!strcasecmp(user, session[i].user))
                                sessionkill(i, "Duplicate session for users");
                }
@@ -4660,7 +4917,7 @@ int sessionsetup(sessionidt s, tunnelidt t)
        if (session[s].throttle_in || session[s].throttle_out)
                throttle_session(s, session[s].throttle_in, session[s].throttle_out);
 
-       session[s].last_packet = time_now;
+       session[s].last_packet = session[s].last_data = time_now;
 
        LOG(2, s, t, "Login by %s at %s from %s (%s)\n", session[s].user,
                fmtaddr(htonl(session[s].ip), 0),
@@ -4763,13 +5020,13 @@ int load_session(sessionidt s, sessiont *new)
        // check filters
        if (new->filter_in && (new->filter_in > MAXFILTER || !ip_filters[new->filter_in - 1].name[0]))
        {
-               LOG(2, s, session[s].tunnel, "Dropping invalid input filter %d\n", (int) new->filter_in);
+               LOG(2, s, session[s].tunnel, "Dropping invalid input filter %u\n", (int) new->filter_in);
                new->filter_in = 0;
        }
 
        if (new->filter_out && (new->filter_out > MAXFILTER || !ip_filters[new->filter_out - 1].name[0]))
        {
-               LOG(2, s, session[s].tunnel, "Dropping invalid output filter %d\n", (int) new->filter_out);
+               LOG(2, s, session[s].tunnel, "Dropping invalid output filter %u\n", (int) new->filter_out);
                new->filter_out = 0;
        }
 
@@ -5153,7 +5410,7 @@ static tunnelidt new_tunnel()
        {
                if (tunnel[i].state == TUNNELFREE)
                {
-                       LOG(4, 0, i, "Assigning tunnel ID %d\n", i);
+                       LOG(4, 0, i, "Assigning tunnel ID %u\n", i);
                        if (i > config->cluster_highest_tunnelid)
                                config->cluster_highest_tunnelid = i;
                        return i;
@@ -5223,7 +5480,7 @@ int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc
                if (!session[s].opened)
                        continue;
 
-               idle = time_now - session[s].last_packet;
+               idle = time_now - session[s].last_data;
                idle /= 5 ; // In multiples of 5 seconds.
                if (idle < 0)
                        idle = 0;