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restart BGP on receipt of CEASE
[l2tpns.git] / bgp.c
diff --git a/bgp.c b/bgp.c
index 9f64d39..6a868fa 100644 (file)
--- a/bgp.c
+++ b/bgp.c
@@ -10,7 +10,7 @@
  *   nor RFC2385 (which requires a kernel patch on 2.4 kernels).
  */
 
  *   nor RFC2385 (which requires a kernel patch on 2.4 kernels).
  */
 
-char const *cvs_id_bgp = "$Id: bgp.c,v 1.9 2004/12/16 08:49:52 bodea Exp $";
+char const *cvs_id_bgp = "$Id: bgp.c,v 1.12 2005/09/02 23:39:36 bodea Exp $";
 
 #include <stdlib.h>
 #include <unistd.h>
 
 #include <stdlib.h>
 #include <unistd.h>
@@ -75,6 +75,10 @@ int bgp_setup(int as)
 
            return 0;
        }
 
            return 0;
        }
+
+       peer->edata.type = FD_TYPE_BGP;
+       peer->edata.index = i;
+       peer->events = 0;
     }
 
     if (as < 1)
     }
 
     if (as < 1)
@@ -270,6 +274,7 @@ static void bgp_clear(struct bgp_peer *peer)
     peer->inbuf->done = 0;
 
     peer->cli_flag = 0;
     peer->inbuf->done = 0;
 
     peer->cli_flag = 0;
+    peer->events = 0;
 
     if (peer->state != peer->next_state)
     {
 
     if (peer->state != peer->next_state)
     {
@@ -487,130 +492,160 @@ void bgp_enable_routing(int enable)
     LOG(4, 0, 0, "%s BGP routing\n", enable ? "Enabled" : "Suspended");
 }
 
     LOG(4, 0, 0, "%s BGP routing\n", enable ? "Enabled" : "Suspended");
 }
 
-/* return a bitmask indicating if the socket should be added to the
-   read set (1) and or write set (2) for select */
-int bgp_select_state(struct bgp_peer *peer)
+#ifdef HAVE_EPOLL
+# include <sys/epoll.h>
+#else
+# include "fake_epoll.h"
+#endif
+
+/* return a bitmask of the events required to poll this peer's fd */
+int bgp_set_poll()
 {
 {
-    int flags = 0;
+    int i;
 
     if (!bgp_configured)
        return 0;
 
 
     if (!bgp_configured)
        return 0;
 
-    if (peer->state == Disabled || peer->state == Idle)
-       return 0;
+    for (i = 0; i < BGP_NUM_PEERS; i++)
+    {
+       struct bgp_peer *peer = &bgp_peers[i];
+       int events = 0;
+
+       if (peer->state == Disabled || peer->state == Idle)
+           continue;
+
+       if (peer->inbuf->done < BGP_MAX_PACKET_SIZE)
+           events |= EPOLLIN;
+
+       if (peer->state == Connect ||           /* connection in progress */
+           peer->update_routes ||              /* routing updates */
+           peer->outbuf->packet.header.len)    /* pending output */
+           events |= EPOLLOUT;
 
 
-    if (peer->inbuf->done < BGP_MAX_PACKET_SIZE)
-       flags |= 1;
+       if (peer->events != events)
+       {
+           struct epoll_event ev;
 
 
-    if (peer->state == Connect ||              /* connection in progress */
-       peer->update_routes ||                  /* routing updates */
-       peer->outbuf->packet.header.len)        /* pending output */
-       flags |= 2;
+           ev.events = peer->events = events;
+           ev.data.ptr = &peer->edata;
+           epoll_ctl(epollfd, EPOLL_CTL_MOD, peer->sock, &ev);
+       }
+    }
 
 
-    return flags;
+    return 1;
 }
 
 }
 
-/* process bgp peer */
-int bgp_process(struct bgp_peer *peer, int readable, int writable)
+/* process bgp events/timers */
+int bgp_process(uint32_t events[])
 {
 {
+    int i;
+
     if (!bgp_configured)
        return 0;
 
     if (!bgp_configured)
        return 0;
 
-    if (*peer->name && peer->cli_flag == BGP_CLI_RESTART)
-       return bgp_restart(peer);
+    for (i = 0; i < BGP_NUM_PEERS; i++)
+    {
+       struct bgp_peer *peer = &bgp_peers[i];
 
 
-    if (peer->state == Disabled)
-       return 1;
+       if (*peer->name && peer->cli_flag == BGP_CLI_RESTART)
+       {
+           bgp_restart(peer);
+           continue;
+       }
 
 
-    if (peer->cli_flag)
-    {
-       switch (peer->cli_flag)
+       if (peer->state == Disabled)
+           continue;
+
+       if (peer->cli_flag)
        {
        {
-       case BGP_CLI_SUSPEND:
-           if (peer->routing)
+           switch (peer->cli_flag)
            {
            {
-               peer->routing = 0;
-               if (peer->state == Established)
-                   peer->update_routes = 1;
-           }
+           case BGP_CLI_SUSPEND:
+               if (peer->routing)
+               {
+                   peer->routing = 0;
+                   if (peer->state == Established)
+                       peer->update_routes = 1;
+               }
 
 
-           break;
+               break;
 
 
-       case BGP_CLI_ENABLE:
-           if (!peer->routing)
-           {
-               peer->routing = 1;
-               if (peer->state == Established)
-                   peer->update_routes = 1;
+           case BGP_CLI_ENABLE:
+               if (!peer->routing)
+               {
+                   peer->routing = 1;
+                   if (peer->state == Established)
+                       peer->update_routes = 1;
+               }
+
+               break;
            }
 
            }
 
-           break;
+           peer->cli_flag = 0;
        }
 
        }
 
-       peer->cli_flag = 0;
-    }
-
-    /* handle empty/fill of buffers */
-    if (writable)
-    {
-       int r = 1;
-       if (peer->state == Connect)
-           r = bgp_handle_connect(peer);
-       else if (peer->outbuf->packet.header.len)
-           r = bgp_write(peer);
+       /* handle empty/fill of buffers */
+       if (events[i] & EPOLLOUT)
+       {
+           int r = 1;
+           if (peer->state == Connect)
+               r = bgp_handle_connect(peer);
+           else if (peer->outbuf->packet.header.len)
+               r = bgp_write(peer);
 
 
-       if (!r)
-           return 0;
-    }
+           if (!r)
+               continue;
+       }
 
 
-    if (readable)
-    {
-       if (!bgp_read(peer))
-           return 0;
-    }
+       if (events[i] & (EPOLLIN|EPOLLHUP))
+       {
+           if (!bgp_read(peer))
+               continue;
+       }
 
 
-    /* process input buffer contents */
-    while (peer->inbuf->done >= sizeof(peer->inbuf->packet.header)
-       && !peer->outbuf->packet.header.len) /* may need to queue a response */
-    {
-       if (bgp_handle_input(peer) < 0)
-           return 0;
-    }
+       /* process input buffer contents */
+       while (peer->inbuf->done >= sizeof(peer->inbuf->packet.header)
+           && !peer->outbuf->packet.header.len) /* may need to queue a response */
+       {
+           if (bgp_handle_input(peer) < 0)
+               continue;
+       }
 
 
-    /* process pending updates */
-    if (peer->update_routes
-       && !peer->outbuf->packet.header.len) /* ditto */
-    {
-       if (!bgp_send_update(peer))
-           return 0;
-    }
+       /* process pending updates */
+       if (peer->update_routes
+           && !peer->outbuf->packet.header.len) /* ditto */
+       {
+           if (!bgp_send_update(peer))
+               continue;
+       }
 
 
-    /* process timers */
-    if (peer->state == Established)
-    {
-       if (time_now > peer->expire_time)
+       /* process timers */
+       if (peer->state == Established)
        {
        {
-           LOG(1, 0, 0, "No message from BGP peer %s in %ds\n",
-               peer->name, peer->hold);
+           if (time_now > peer->expire_time)
+           {
+               LOG(1, 0, 0, "No message from BGP peer %s in %ds\n",
+                   peer->name, peer->hold);
 
 
-           bgp_send_notification(peer, BGP_ERR_HOLD_TIMER_EXP, 0);
-           return 0;
-       }
+               bgp_send_notification(peer, BGP_ERR_HOLD_TIMER_EXP, 0);
+               continue;
+           }
 
 
-       if (time_now > peer->keepalive_time && !peer->outbuf->packet.header.len)
-           bgp_send_keepalive(peer);
-    }
-    else if (peer->state == Idle)
-    {
-       if (time_now > peer->retry_time)
-           return bgp_connect(peer);
-    }
-    else if (time_now > peer->state_time + BGP_STATE_TIME)
-    {
-       LOG(1, 0, 0, "%s timer expired for BGP peer %s\n",
-           bgp_state_str(peer->state), peer->name);
+           if (time_now > peer->keepalive_time && !peer->outbuf->packet.header.len)
+               bgp_send_keepalive(peer);
+       }
+       else if (peer->state == Idle)
+       {
+           if (time_now > peer->retry_time)
+               bgp_connect(peer);
+       }
+       else if (time_now > peer->state_time + BGP_STATE_TIME)
+       {
+           LOG(1, 0, 0, "%s timer expired for BGP peer %s\n",
+               bgp_state_str(peer->state), peer->name);
 
 
-       return bgp_restart(peer);
+           bgp_restart(peer);
+       }
     }
 
     return 1;
     }
 
     return 1;
@@ -661,6 +696,7 @@ static int bgp_connect(struct bgp_peer *peer)
 {
     static int bgp_port = 0;
     struct sockaddr_in addr;
 {
     static int bgp_port = 0;
     struct sockaddr_in addr;
+    struct epoll_event ev;
 
     if (!bgp_port)
     {
 
     if (!bgp_port)
     {
@@ -683,6 +719,11 @@ static int bgp_connect(struct bgp_peer *peer)
        return 0;
     }
 
        return 0;
     }
 
+    /* add to poll set */
+    ev.events = peer->events = EPOLLOUT;
+    ev.data.ptr = &peer->edata;
+    epoll_ctl(epollfd, EPOLL_CTL_ADD, peer->sock, &ev);
+
     /* set to non-blocking */
     fcntl(peer->sock, F_SETFL, fcntl(peer->sock, F_GETFL, 0) | O_NONBLOCK);
 
     /* set to non-blocking */
     fcntl(peer->sock, F_SETFL, fcntl(peer->sock, F_GETFL, 0) | O_NONBLOCK);
 
@@ -726,7 +767,7 @@ static int bgp_connect(struct bgp_peer *peer)
 static int bgp_handle_connect(struct bgp_peer *peer)
 {
     int err = 0;
 static int bgp_handle_connect(struct bgp_peer *peer)
 {
     int err = 0;
-    int len = sizeof(int);
+    socklen_t len = sizeof(int);
     getsockopt(peer->sock, SOL_SOCKET, SO_ERROR, &err, &len);
     if (err)
     {
     getsockopt(peer->sock, SOL_SOCKET, SO_ERROR, &err, &len);
     if (err)
     {
@@ -955,7 +996,7 @@ static int bgp_handle_input(struct bgp_peer *peer)
            if (notification->error_code == BGP_ERR_CEASE)
            {
                LOG(4, 0, 0, "BGP peer %s sent CEASE\n", peer->name);
            if (notification->error_code == BGP_ERR_CEASE)
            {
                LOG(4, 0, 0, "BGP peer %s sent CEASE\n", peer->name);
-               bgp_halt(peer);
+               bgp_restart(peer);
                return 0;
            }
 
                return 0;
            }
 
for cloning use: "git clone git://git.sameswireless.fr/l2tpns.git" ; For add to your sources.list: "deb http://package.sameswifi.fr/ jessie main"