diff options
Diffstat (limited to 'ospf6d/ospf6_lsa.c')
| -rw-r--r-- | ospf6d/ospf6_lsa.c | 83 |
1 files changed, 80 insertions, 3 deletions
diff --git a/ospf6d/ospf6_lsa.c b/ospf6d/ospf6_lsa.c index 017751825f..622e5f9e0f 100644 --- a/ospf6d/ospf6_lsa.c +++ b/ospf6d/ospf6_lsa.c @@ -37,8 +37,85 @@ DEFINE_MTYPE_STATIC(OSPF6D, OSPF6_LSA, "OSPF6 LSA"); DEFINE_MTYPE_STATIC(OSPF6D, OSPF6_LSA_HEADER, "OSPF6 LSA header"); DEFINE_MTYPE_STATIC(OSPF6D, OSPF6_LSA_SUMMARY, "OSPF6 LSA summary"); +const uint8_t ospf6_lsa_min_size[OSPF6_LSTYPE_SIZE] = { + [OSPF6_LSTYPE_UNKNOWN] = 0, + [0x00ff & OSPF6_LSTYPE_ROUTER] = OSPF6_ROUTER_LSA_MIN_SIZE, + [0x00ff & OSPF6_LSTYPE_NETWORK] = OSPF6_NETWORK_LSA_MIN_SIZE, + [0x00ff & OSPF6_LSTYPE_INTER_PREFIX] = OSPF6_INTER_PREFIX_LSA_MIN_SIZE, + [0x00ff & OSPF6_LSTYPE_INTER_ROUTER] = OSPF6_INTER_ROUTER_LSA_FIX_SIZE, + [0x00ff & OSPF6_LSTYPE_AS_EXTERNAL] = OSPF6_AS_EXTERNAL_LSA_MIN_SIZE, + [0x00ff & OSPF6_LSTYPE_GROUP_MEMBERSHIP] = 0, /* Unused */ + [0x00ff & OSPF6_LSTYPE_TYPE_7] = OSPF6_AS_EXTERNAL_LSA_MIN_SIZE, + [0x00ff & OSPF6_LSTYPE_LINK] = OSPF6_LINK_LSA_MIN_SIZE, + [0x00ff & OSPF6_LSTYPE_INTRA_PREFIX] = OSPF6_INTRA_PREFIX_LSA_MIN_SIZE, + [0x00ff & OSPF6_LSTYPE_GRACE_LSA] = 0 +}; + +void *lsdesc_start_lsa_type(struct ospf6_lsa_header *header, int lsa_type) +{ + uint8_t t = (0x00ff & lsa_type); + + if (t == OSPF6_LSTYPE_UNKNOWN || t >= OSPF6_LSTYPE_SIZE) { + zlog_debug("Cannot get descriptor offset for unknown lsa type 0x%x", + t); + return ospf6_lsa_end(header); + } + return (char *)lsa_after_header(header) + ospf6_lsa_min_size[t]; +} + +void *lsdesc_start(struct ospf6_lsa_header *header) +{ + return lsdesc_start_lsa_type(header, ntohs(header->type)); +} + 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; +} + +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; @@ -65,7 +142,7 @@ static int ospf6_unknown_lsa_show(struct vty *vty, struct ospf6_lsa *lsa, { char *start, *end, *current; - start = ospf6_lsa_header_end(lsa->header); + start = lsa_after_header(lsa->header); end = ospf6_lsa_end(lsa->header); if (use_json) { @@ -234,8 +311,8 @@ int ospf6_lsa_is_changed(struct ospf6_lsa *lsa1, struct ospf6_lsa *lsa2) if (length <= 0) return 0; - return memcmp(ospf6_lsa_header_end(lsa1->header), - ospf6_lsa_header_end(lsa2->header), length); + return memcmp(lsa_after_header(lsa1->header), + lsa_after_header(lsa2->header), length); } /* ospf6 age functions */ |