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Move NEXT_HOP attribute so that we can exclude it.

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We will need to do that when we will send IPv6 routes (RFC4760 says we SHOULD
NOT carry this attribute when we will send UPDATE without NLRI). So, we save
the length of all the attributes except NEXT_HOP for later memcpy().

Signed-off-by: Benjamin Cama <benoar@dolka.fr>
This commit is contained in:
Benjamin Cama 2011-07-20 00:49:28 +02:00
parent f2e59e9881
commit 02611e54fc
2 changed files with 13 additions and 9 deletions
Download patch file Download diff file Expand all files Collapse all files

21
bgp.c
View file

@ -193,15 +193,6 @@ int bgp_start(struct bgp_peer *peer, char *name, int as, int keepalive,
ADD_ATTRIBUTE();
/* NEXT_HOP */
a.flags = BGP_PATH_ATTR_FLAG_TRANS;
a.code = BGP_PATH_ATTR_CODE_NEXT_HOP;
ip = my_address; /* we're it */
a.data.s.len = sizeof(ip);
memcpy(a.data.s.value, &ip, sizeof(ip));
ADD_ATTRIBUTE();
/* MULTI_EXIT_DISC */
a.flags = BGP_PATH_ATTR_FLAG_OPTIONAL;
a.code = BGP_PATH_ATTR_CODE_MULTI_EXIT_DISC;
@ -231,6 +222,18 @@ int bgp_start(struct bgp_peer *peer, char *name, int as, int keepalive,
ADD_ATTRIBUTE();
/* remember the len before adding NEXT_HOP */
peer->path_attr_len_without_nexthop = peer->path_attr_len;
/* NEXT_HOP */
a.flags = BGP_PATH_ATTR_FLAG_TRANS;
a.code = BGP_PATH_ATTR_CODE_NEXT_HOP;
ip = my_address; /* we're it */
a.data.s.len = sizeof(ip);
memcpy(a.data.s.value, &ip, sizeof(ip));
ADD_ATTRIBUTE();
if (!(peer->path_attrs = malloc(peer->path_attr_len)))
{
LOG(0, 0, 0, "Can't allocate path_attrs for %s (%s)\n",

1
bgp.h
View file

@ -203,6 +203,7 @@ struct bgp_peer {
int cli_flag; /* updates requested from CLI */
char *path_attrs; /* path attrs to send in UPDATE message */
int path_attr_len; /* length of path attrs */
int path_attr_len_without_nexthop; /* length of path attrs without NEXT_HOP */
uint32_t events; /* events to poll */
struct event_data edata; /* poll data */
int handle_ipv6_routes; /* can handle IPv6 routes advertisements */