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ospf6d: add nth_lsdesc()

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Add utility function to find the Nth router lsdesc or network lsdesc in
an LSA.

Signed-off-by: Andrew Cooks <acooks.at.bda@gmail.com>
This commit is contained in:
Andrew Cooks 2024-08-05 16:09:30 +10:00
parent d0366de57c
commit cd6d36fd82
2 changed files with 24 additions and 0 deletions
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22
ospf6d/ospf6_lsa.c
View File

@ -70,6 +70,28 @@ void *lsdesc_start(struct ospf6_lsa_header *header)
static struct ospf6_lsa_handler *lsa_handlers[OSPF6_LSTYPE_SIZE];
void *nth_lsdesc(struct ospf6_lsa_header *header, int pos)
{
char *lsdesc = lsdesc_start(header);
char *lsa_end = ospf6_lsa_end(header);
char *nth;
int lsdesc_size;
if (ntohs(header->type) == OSPF6_LSTYPE_ROUTER)
lsdesc_size = OSPF6_ROUTER_LSDESC_FIX_SIZE;
else if (ntohs(header->type) == OSPF6_LSTYPE_NETWORK)
lsdesc_size = OSPF6_NETWORK_LSDESC_FIX_SIZE;
else
return NULL;
nth = lsdesc + (pos * lsdesc_size);
if (nth + lsdesc_size <= lsa_end)
return nth;
return NULL;
}
struct ospf6 *ospf6_get_by_lsdb(struct ospf6_lsa *lsa)
{
struct ospf6 *ospf6 = NULL;

2
ospf6d/ospf6_lsa.h
View File

@ -374,4 +374,6 @@ struct ospf6_lsa *ospf6_find_external_lsa(struct ospf6 *ospf6,
void *lsdesc_start_lsa_type(struct ospf6_lsa_header *header, int lsa_type);
void *lsdesc_start(struct ospf6_lsa_header *header);
void *nth_lsdesc(struct ospf6_lsa_header *header, int pos);
#endif /* OSPF6_LSA_H */