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isisd: Extend SPF algo to process SRv6 locator

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Extend SPF algorithm to process SRv6 locator.

Signed-off-by: Carmine Scarpitta <carmine.scarpitta@uniroma2.it>
This commit is contained in:
Carmine Scarpitta 2023-02-22 10:27:15 +01:00
parent 39cf995a82
commit f1152a9005
1 changed files with 45 additions and 0 deletions
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45
isisd/isis_spf.c
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@ -837,6 +837,7 @@ static int isis_spf_process_lsp(struct isis_spftree *spftree,
struct isis_mt_router_info *mt_router_info = NULL;
struct prefix_pair ip_info;
bool has_valid_psid;
bool loc_is_in_ipv6_reach = false;
if (isis_lfa_excise_node_check(spftree, lsp->hdr.lsp_id)) {
if (IS_DEBUG_LFA)
@ -1128,6 +1129,50 @@ lspfragloop:
process_N(spftree, vtype, &ip_info, dist,
depth + 1, NULL, parent);
}
/* Process SRv6 Locator TLVs */
struct isis_item_list *srv6_locators = isis_lookup_mt_items(
&lsp->tlvs->srv6_locator, spftree->mtid);
struct isis_srv6_locator_tlv *loc;
for (loc = srv6_locators ? (struct isis_srv6_locator_tlv *)
srv6_locators->head
: NULL;
loc; loc = loc->next) {
if (loc->algorithm != SR_ALGORITHM_SPF)
continue;
dist = cost + loc->metric;
vtype = VTYPE_IP6REACH_INTERNAL;
memset(&ip_info, 0, sizeof(ip_info));
ip_info.dest.family = AF_INET6;
ip_info.dest.u.prefix6 = loc->prefix.prefix;
ip_info.dest.prefixlen = loc->prefix.prefixlen;
/* An SRv6 Locator can be received in both a Prefix
Reachability TLV and an SRv6 Locator TLV (as per RFC
9352 section #5). We go through the Prefix Reachability
TLVs and check if the SRv6 Locator is present in some of
them. If we find the SRv6 Locator in some Prefix
Reachbility TLV then it means that we have already
processed it before and we can skip it. */
for (r = ipv6_reachs ? (struct isis_ipv6_reach *)
ipv6_reachs->head
: NULL;
r; r = r->next) {
if (prefix_same((struct prefix *)&r->prefix,
(struct prefix *)&loc->prefix))
loc_is_in_ipv6_reach = true;
}
/* SRv6 locator not present in Prefix Reachability TLV,
* let's process it */
if (!loc_is_in_ipv6_reach)
process_N(spftree, vtype, &ip_info, dist,
depth + 1, NULL, parent);
}
}
end: