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isisd: introduce new adjacency hooks

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The 'isis_adj_ip_enabled_hook' hook will be called whenever
an adjacency goes from zero to one or more IPv4 or IPv6
addresses. Conversely, the 'isis_adj_ip_disabled_hook' hook will
be called whenever an adjacency goes from one or more IPv4/IPv6
addresses to no addresses at all.

These hooks will be used by the upcoming SR code to add/delete
Adj-SIDs depending on the IP addresses present in the remote
adjacencies.

Signed-off-by: Renato Westphal <renato@opensourcerouting.org>
This commit is contained in:
Renato Westphal 2019-08-07 19:54:00 -03:00 committed by Olivier Dugeon
parent 0b7005375f
commit 3056368301
2 changed files with 29 additions and 0 deletions
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4
isisd/isis_adjacency.h
View File

@ -118,6 +118,10 @@ void isis_adj_process_threeway(struct isis_adjacency *adj,
struct isis_threeway_adj *tw_adj,
enum isis_adj_usage adj_usage);
DECLARE_HOOK(isis_adj_state_change_hook, (struct isis_adjacency *adj), (adj))
DECLARE_HOOK(isis_adj_ip_enabled_hook,
(struct isis_adjacency *adj, int family), (adj, family))
DECLARE_HOOK(isis_adj_ip_disabled_hook,
(struct isis_adjacency *adj, int family), (adj, family))
void isis_adj_state_change(struct isis_adjacency **adj,
enum isis_adj_state state, const char *reason);
void isis_adj_print(struct isis_adjacency *adj);

25
isisd/isis_tlvs.c
View File

@ -4413,10 +4413,22 @@ static void tlvs_protocols_supported_to_adj(struct isis_tlvs *tlvs,
memcpy(adj->nlpids.nlpids, reduced.nlpids, reduced.count);
}
DEFINE_HOOK(isis_adj_ip_enabled_hook, (struct isis_adjacency *adj, int family),
(adj, family))
DEFINE_HOOK(isis_adj_ip_disabled_hook,
(struct isis_adjacency *adj, int family), (adj, family))
static void tlvs_ipv4_addresses_to_adj(struct isis_tlvs *tlvs,
struct isis_adjacency *adj,
bool *changed)
{
bool ipv4_enabled = false;
if (adj->ipv4_address_count == 0 && tlvs->ipv4_address.count > 0)
ipv4_enabled = true;
else if (adj->ipv4_address_count > 0 && tlvs->ipv4_address.count == 0)
hook_call(isis_adj_ip_disabled_hook, adj, AF_INET);
if (adj->ipv4_address_count != tlvs->ipv4_address.count) {
*changed = true;
adj->ipv4_address_count = tlvs->ipv4_address.count;
@ -4440,12 +4452,22 @@ static void tlvs_ipv4_addresses_to_adj(struct isis_tlvs *tlvs,
*changed = true;
adj->ipv4_addresses[i] = addr->addr;
}
if (ipv4_enabled)
hook_call(isis_adj_ip_enabled_hook, adj, AF_INET);
}
static void tlvs_ipv6_addresses_to_adj(struct isis_tlvs *tlvs,
struct isis_adjacency *adj,
bool *changed)
{
bool ipv6_enabled = false;
if (adj->ipv6_address_count == 0 && tlvs->ipv6_address.count > 0)
ipv6_enabled = true;
else if (adj->ipv6_address_count > 0 && tlvs->ipv6_address.count == 0)
hook_call(isis_adj_ip_disabled_hook, adj, AF_INET6);
if (adj->ipv6_address_count != tlvs->ipv6_address.count) {
*changed = true;
adj->ipv6_address_count = tlvs->ipv6_address.count;
@ -4469,6 +4491,9 @@ static void tlvs_ipv6_addresses_to_adj(struct isis_tlvs *tlvs,
*changed = true;
adj->ipv6_addresses[i] = addr->addr;
}
if (ipv6_enabled)
hook_call(isis_adj_ip_enabled_hook, adj, AF_INET6);
}
void isis_tlvs_to_adj(struct isis_tlvs *tlvs, struct isis_adjacency *adj,