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Don't send notification when receiving an unsupported capability.
[l2tpns.git] / bgp.c
diff --git a/bgp.c b/bgp.c
index d9c5818..420a925 100644 (file)
--- a/bgp.c
+++ b/bgp.c
@@ -49,8 +49,6 @@ static int bgp_send_update(struct bgp_peer *peer);
 static int bgp_send_update6(struct bgp_peer *peer);
 static int bgp_send_notification(struct bgp_peer *peer, uint8_t code,
     uint8_t subcode);
-static int bgp_send_notification_full(struct bgp_peer *peer, uint8_t code,
-    uint8_t subcode, char *notification_data, uint16_t data_len);
 
 static uint16_t our_as;
 static struct bgp_route_list *bgp_routes = 0;
@@ -260,7 +258,7 @@ int bgp_start(struct bgp_peer *peer, char *name, int as, int keepalive,
        a.code = BGP_PATH_ATTR_CODE_MP_REACH_NLRI;
        a.data.s.len = 0; /* will be set on UPDATE */
 
-       mp_reach_nlri_partial.afi = htons(AF_INET6);
+       mp_reach_nlri_partial.afi = htons(BGP_MP_AFI_IPv6);
        mp_reach_nlri_partial.safi = BGP_MP_SAFI_UNICAST;
        mp_reach_nlri_partial.reserved = 0;
        mp_reach_nlri_partial.next_hop_len = 16;
@@ -286,7 +284,7 @@ int bgp_start(struct bgp_peer *peer, char *name, int as, int keepalive,
        a.code = BGP_PATH_ATTR_CODE_MP_UNREACH_NLRI;
        a.data.e.len = 0; /* will be set on UPDATE */
 
-       mp_unreach_nlri_partial.afi = htons(AF_INET6);
+       mp_unreach_nlri_partial.afi = htons(BGP_MP_AFI_IPv6);
        mp_unreach_nlri_partial.safi = BGP_MP_SAFI_UNICAST;
 
        memcpy(&a.data.e.value, &mp_unreach_nlri_partial,
@@ -295,6 +293,8 @@ int bgp_start(struct bgp_peer *peer, char *name, int as, int keepalive,
                BGP_PATH_ATTR_MP_UNREACH_NLRI_PARTIAL_SIZE);
     }
 
+    peer->mp_handling = HandlingUnknown;
+
     LOG(4, 0, 0, "Initiating BGP connection to %s (routing %s)\n",
        name, enable ? "enabled" : "suspended");
 
@@ -554,7 +554,8 @@ int bgp_add_route6(struct in6_addr ip, int prefixlen)
 
     /* flag established peers for update */
     for (i = 0; i < BGP_NUM_PEERS; i++)
-       if (bgp_peers[i].state == Established)
+       if (bgp_peers[i].state == Established
+               && bgp_peers[i].mp_handling == HandleIPv6Routes)
            bgp_peers[i].update_routes6 = 1;
 
     LOG(4, 0, 0, "Registered BGP route %s/%d\n",
@@ -654,7 +655,8 @@ int bgp_del_route6(struct in6_addr ip, int prefixlen)
 
     /* flag established peers for update */
     for (i = 0; i < BGP_NUM_PEERS; i++)
-       if (bgp_peers[i].state == Established)
+       if (bgp_peers[i].state == Established
+               && bgp_peers[i].mp_handling == HandleIPv6Routes)
            bgp_peers[i].update_routes6 = 1;
 
     LOG(4, 0, 0, "Removed BGP route %s/%d\n",
@@ -967,8 +969,6 @@ static int bgp_connect(struct bgp_peer *peer)
 
     LOG(4, 0, 0, "BGP peer %s: state Active\n", inet_ntoa(addr.sin_addr));
 
-    peer->handle_ipv6_routes = 0;
-
     return bgp_send_open(peer);
 }
 
@@ -992,8 +992,6 @@ static int bgp_handle_connect(struct bgp_peer *peer)
 
     LOG(4, 0, 0, "BGP peer %s: state Active\n", peer->name);
 
-    peer->handle_ipv6_routes = 0;
-
     return bgp_send_open(peer);
 }
 
@@ -1187,7 +1185,7 @@ static int bgp_handle_input(struct bgp_peer *peer)
                    param_offset < data.opt_len;
                    param_offset += 2 + param->len)
            {
-               param = (struct bgp_opt_param *)(&data.opt_params + param_offset);
+               param = (struct bgp_opt_param *)((char *)&data.opt_params + param_offset);
 
                /* sensible check */
                if (data.opt_len - param_offset < 2
@@ -1212,11 +1210,8 @@ static int bgp_handle_input(struct bgp_peer *peer)
 
                capabilities_len = param->len;
                capabilities = (char *)&param->value;
-           }
 
-           /* look for BGP multiprotocol capability */
-           if (capabilities)
-           {
+               /* look for BGP multiprotocol capability */
                for (capability_offset = 0;
                        capability_offset < capabilities_len;
                        capability_offset += 2 + capability->len)
@@ -1241,29 +1236,34 @@ static int bgp_handle_input(struct bgp_peer *peer)
                        LOG(4, 0, 0, "Unsupported Capability code %d from BGP peer %s\n",
                            capability->code, peer->name);
 
-                       bgp_send_notification_full(peer, BGP_ERR_OPEN, BGP_ERR_OPN_UNSUP_CAP,
-                               (char *)capability, 2 + capability->len);
                        /* we don't terminate, still; we just jump to the next one */
                        continue;
                    }
 
                    mp_cap = (struct bgp_mp_cap_param *)&capability->value;
                    /* the only <AFI, SAFI> tuple we support */
-                   if (ntohs(mp_cap->afi) != AF_INET6 && mp_cap->safi != BGP_MP_SAFI_UNICAST)
+                   if (ntohs(mp_cap->afi) != BGP_MP_AFI_IPv6 && mp_cap->safi != BGP_MP_SAFI_UNICAST)
                    {
                        LOG(4, 0, 0, "Unsupported multiprotocol AFI %d and SAFI %d from BGP peer %s\n",
                            mp_cap->afi, mp_cap->safi, peer->name);
 
-                       bgp_send_notification_full(peer, BGP_ERR_OPEN, BGP_ERR_OPN_UNSUP_CAP,
-                               (char *)capability, 2 + capability->len);
                        /* we don't terminate, still; we just jump to the next one */
                        continue;
                    }
 
-                   peer->handle_ipv6_routes = 1;
+                   /* yes it can! */
+                   peer->mp_handling = HandleIPv6Routes;
                }
            }
 
+           if (peer->mp_handling != HandleIPv6Routes)
+           {
+               peer->mp_handling = DoesntHandleIPv6Routes;
+               if (config->ipv6_prefix.s6_addr[0])
+                   LOG(1, 0, 0, "Warning: BGP peer %s doesn't handle IPv6 prefixes updates\n",
+                           peer->name);
+           }
+
            /* next transition requires an exchange of keepalives */
            bgp_send_keepalive(peer);
        }
@@ -1298,6 +1298,15 @@ static int bgp_handle_input(struct bgp_peer *peer)
                return 0;
            }
 
+           if (notification->error_code == BGP_ERR_OPEN
+                   && notification->error_subcode == BGP_ERR_OPN_UNSUP_PARAM)
+           {
+               LOG(4, 0, 0, "BGP peer %s doesn't support BGP Capabilities\n", peer->name);
+               peer->mp_handling = DoesntHandleIPv6Routes;
+               bgp_restart(peer);
+               return 0;
+           }
+
            if (notification->error_code == BGP_ERR_OPEN
                    && notification->error_subcode == BGP_ERR_OPN_UNSUP_CAP)
            {
@@ -1305,7 +1314,7 @@ static int bgp_handle_input(struct bgp_peer *peer)
                   an "unsupported capability" message, we disable IPv6 routes for
                   this peer */
                LOG(4, 0, 0, "BGP peer %s doesn't support IPv6 routes advertisement\n", peer->name);
-               peer->handle_ipv6_routes = 0;
+               peer->mp_handling = DoesntHandleIPv6Routes;
                break;
            }
 
@@ -1339,7 +1348,7 @@ static int bgp_handle_input(struct bgp_peer *peer)
 static int bgp_send_open(struct bgp_peer *peer)
 {
     struct bgp_data_open data;
-    struct bgp_mp_cap_param mp_ipv6 = { htons(AF_INET6), 0, BGP_MP_SAFI_UNICAST };
+    struct bgp_mp_cap_param mp_ipv6 = { htons(BGP_MP_AFI_IPv6), 0, BGP_MP_SAFI_UNICAST };
     struct bgp_capability cap_mp_ipv6;
     struct bgp_opt_param param_cap_mp_ipv6;
     uint16_t len = sizeof(peer->outbuf->packet.header);
@@ -1354,20 +1363,29 @@ static int bgp_send_open(struct bgp_peer *peer)
     data.hold_time = htons(peer->hold);
     data.identifier = my_address;
 
-    /* construct the param and capability */
-    cap_mp_ipv6.code = BGP_CAP_CODE_MP;
-    cap_mp_ipv6.len = sizeof(mp_ipv6);
-    memcpy(&cap_mp_ipv6.value, &mp_ipv6, cap_mp_ipv6.len);
+    /* if we know peer doesn't support MP (mp_handling == DoesntHandleIPv6Routes)
+       then don't add this parameter */
+    if (config->ipv6_prefix.s6_addr[0]
+           && (peer->mp_handling == HandlingUnknown
+               || peer->mp_handling == HandleIPv6Routes))
+    {
+       /* construct the param and capability */
+       cap_mp_ipv6.code = BGP_CAP_CODE_MP;
+       cap_mp_ipv6.len = sizeof(mp_ipv6);
+       memcpy(&cap_mp_ipv6.value, &mp_ipv6, cap_mp_ipv6.len);
 
-    param_cap_mp_ipv6.type = BGP_PARAM_TYPE_CAPABILITY;
-    param_cap_mp_ipv6.len = 2 + sizeof(mp_ipv6);
-    memcpy(&param_cap_mp_ipv6.value, &cap_mp_ipv6, param_cap_mp_ipv6.len);
+       param_cap_mp_ipv6.type = BGP_PARAM_TYPE_CAPABILITY;
+       param_cap_mp_ipv6.len = 2 + sizeof(mp_ipv6);
+       memcpy(&param_cap_mp_ipv6.value, &cap_mp_ipv6, param_cap_mp_ipv6.len);
 
-    data.opt_len = 2 + param_cap_mp_ipv6.len;
-    memcpy(&data.opt_params, &param_cap_mp_ipv6, data.opt_len);
+       data.opt_len = 2 + param_cap_mp_ipv6.len;
+       memcpy(&data.opt_params, &param_cap_mp_ipv6, data.opt_len);
+    }
+    else
+       data.opt_len = 0;
 
-    memcpy(peer->outbuf->packet.data, &data, BGP_DATA_OPEN_SIZE);
-    len += BGP_DATA_OPEN_SIZE;
+    memcpy(peer->outbuf->packet.data, &data, BGP_DATA_OPEN_SIZE + data.opt_len);
+    len += BGP_DATA_OPEN_SIZE + data.opt_len;
 
     peer->outbuf->packet.header.len = htons(len);
     peer->outbuf->done = 0;
@@ -1698,12 +1716,6 @@ static int bgp_send_update6(struct bgp_peer *peer)
 /* send/buffer NOTIFICATION message */
 static int bgp_send_notification(struct bgp_peer *peer, uint8_t code,
     uint8_t subcode)
-{
-    return bgp_send_notification_full(peer, code, subcode, NULL, 0);
-}
-
-static int bgp_send_notification_full(struct bgp_peer *peer, uint8_t code,
-    uint8_t subcode, char *notification_data, uint16_t data_len)
 {
     struct bgp_data_notification data;
     uint16_t len = 0;
@@ -1714,9 +1726,6 @@ static int bgp_send_notification_full(struct bgp_peer *peer, uint8_t code,
     data.error_subcode = subcode;
     len += sizeof(data.error_code);
 
-    memcpy(data.data, notification_data, data_len);
-    len += data_len;
-
     memset(peer->outbuf->packet.header.marker, 0xff,
        sizeof(peer->outbuf->packet.header.marker));
 
for cloning use: "git clone git://git.sameswireless.fr/l2tpns.git" ; For add to your sources.list: "deb http://package.sameswifi.fr/ jessie main"