Really fix parameters length calculation this time.

Signed-off-by: Benjamin Cama <benoar@dolka.fr>

diff --git a/bgp.c b/bgp.c
index 7ac4c12..0566393 100644 (file)
--- a/bgp.c
+++ b/bgp.c
@@ -1589,7 +1589,7 @@ static int bgp_send_update6(struct bgp_peer *peer)
     /* copy usual attributes */
     memcpy(data, peer->path_attrs, peer->path_attr_len_without_nexthop);
     data += peer->path_attr_len_without_nexthop;
-    len += peer->path_attr_len_without_nexthop;
+    attr_len = peer->path_attr_len_without_nexthop;
 
     /* copy MP unreachable NLRI heading */
     memcpy(data, peer->mp_unreach_nlri_partial,
@@ -1597,7 +1597,7 @@ static int bgp_send_update6(struct bgp_peer *peer)
     /* remember where to update this attr len */
     unreach_len_pos = data + 2;
     data += BGP_PATH_ATTR_MP_UNREACH_NLRI_PARTIAL_SIZE;
-    len += BGP_PATH_ATTR_MP_UNREACH_NLRI_PARTIAL_SIZE;
+    attr_len += BGP_PATH_ATTR_MP_UNREACH_NLRI_PARTIAL_SIZE;
 
     peer->update_routes6 = 0; /* tentatively clear */
 
@@ -1620,7 +1620,7 @@ static int bgp_send_update6(struct bgp_peer *peer)
            memcpy(data, &tmp->dest, s);
            data += s;
            unreach_len += s;
-           len += s;
+           attr_len += s;
 
            LOG(5, 0, 0, "Withdrawing route %s/%d from BGP peer %s\n",
                inet_ntop(AF_INET6, &tmp->dest.prefix, ipv6addr, INET6_ADDRSTRLEN),
@@ -1676,7 +1676,7 @@ static int bgp_send_update6(struct bgp_peer *peer)
     {
        /* we can remove this attribute, then */
        data -= BGP_PATH_ATTR_MP_UNREACH_NLRI_PARTIAL_SIZE;
-       len -= BGP_PATH_ATTR_MP_UNREACH_NLRI_PARTIAL_SIZE;
+       attr_len -= BGP_PATH_ATTR_MP_UNREACH_NLRI_PARTIAL_SIZE;
     }
 
     if (add)
@@ -1701,19 +1701,22 @@ static int bgp_send_update6(struct bgp_peer *peer)
        reach_len = BGP_IP_PREFIX_SIZE(add->dest);
        data[2] = sizeof(struct bgp_attr_mp_reach_nlri_partial) + reach_len;
        data += BGP_PATH_ATTR_MP_REACH_NLRI_PARTIAL_SIZE;
-       len += BGP_PATH_ATTR_MP_REACH_NLRI_PARTIAL_SIZE;
+       attr_len += BGP_PATH_ATTR_MP_REACH_NLRI_PARTIAL_SIZE;
 
        memcpy(data, &add->dest, reach_len);
        data += reach_len;
-       len += reach_len;
+       attr_len += reach_len;
 
        LOG(5, 0, 0, "Advertising route %s/%d to BGP peer %s\n",
            inet_ntop(AF_INET6, &add->dest.prefix, ipv6addr, INET6_ADDRSTRLEN),
            add->dest.len, peer->name);
     }
 
+    /* update len with attributes we added */
+    len += attr_len;
+
     /* go back and insert attr_len */
-    attr_len = htons(len - 4);
+    attr_len = htons(attr_len);
     memcpy((char *)&peer->outbuf->packet.data + 2, &attr_len, sizeof(attr_len));
 
     peer->outbuf->packet.header.len = htons(len);