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| author | Andrew Cooks <acooks.at.bda@gmail.com> | 2024-08-05 08:14:20 +0200 |
|---|---|---|
| committer | Andrew Cooks <acooks.at.bda@gmail.com> | 2024-09-16 10:38:17 +0200 |
| commit | 554350abe0e0c11ca15b0d8c71b17adf231b1595 (patch) | |
| tree | bf66d7dd0768d3bb8320858c06b99ae89e1fc6f1 /ospf6d | |
| parent | ospf6d: use nth_lsdesc() in ospf6_router_lsa_get_nbr_id() (diff) | |
| download | frr-554350abe0e0c11ca15b0d8c71b17adf231b1595.tar.xz frr-554350abe0e0c11ca15b0d8c71b17adf231b1595.zip | |
ospf6d: add nth_prefix()
Add utility function to find the Nth prefix in a link LSA or Intra
Prefix LSA.
Signed-off-by: Andrew Cooks <acooks.at.bda@gmail.com>
Diffstat (limited to 'ospf6d')
| -rw-r--r-- | ospf6d/ospf6_lsa.c | 24 | ||||
| -rw-r--r-- | ospf6d/ospf6_lsa.h | 1 |
2 files changed, 25 insertions, 0 deletions
diff --git a/ospf6d/ospf6_lsa.c b/ospf6d/ospf6_lsa.c index 088ebf56a..622e5f9e0 100644 --- a/ospf6d/ospf6_lsa.c +++ b/ospf6d/ospf6_lsa.c @@ -92,6 +92,30 @@ void *nth_lsdesc(struct ospf6_lsa_header *header, int pos) return NULL; } +void *nth_prefix(struct ospf6_lsa_header *header, int pos) +{ + struct ospf6_prefix *prefix = lsdesc_start(header); + char *end = ospf6_lsa_end(header); + int i = 0; + + if (ntohs(header->type) != OSPF6_LSTYPE_LINK && + ntohs(header->type) != OSPF6_LSTYPE_INTRA_PREFIX) + return NULL; + + if (pos == 0) + return prefix; + + while ((char *)prefix < end && + (char *)prefix + OSPF6_PREFIX_SIZE(prefix) <= end) { + if (i == pos) + return prefix; + i++; + prefix = OSPF6_PREFIX_NEXT(prefix); + } + + return NULL; +} + struct ospf6 *ospf6_get_by_lsdb(struct ospf6_lsa *lsa) { struct ospf6 *ospf6 = NULL; diff --git a/ospf6d/ospf6_lsa.h b/ospf6d/ospf6_lsa.h index d6e0cf771..e2c8edd24 100644 --- a/ospf6d/ospf6_lsa.h +++ b/ospf6d/ospf6_lsa.h @@ -375,5 +375,6 @@ 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); +void *nth_prefix(struct ospf6_lsa_header *header, int pos); #endif /* OSPF6_LSA_H */ |