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272/*
*------------------------------------------------------------------
* Copyright (c) 2018 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*------------------------------------------------------------------
*/
#include <igmp/igmp_report.h>
#include <igmp/igmp_pkt.h>
static ip46_address_t *
igmp_group_mk_source_list (const igmp_membership_group_v3_t * r)
{
ip46_address_t *srcs = NULL;
const ip4_address_t *s;
u16 ii, n;
/*
* we validated this packet when we accepted it in the DP, so
* this number is safe to use
*/
n = clib_net_to_host_u16 (r->n_src_addresses);
if (0 == n)
{
/* a (*,G) join has no source address specified */
vec_validate (srcs, 0);
srcs[0].ip4.as_u32 = 0;
}
else
{
vec_validate (srcs, n - 1);
s = r->src_addresses;
for (ii = 0; ii < n; ii++)
{
srcs[ii].ip4 = *s;
s++;
}
}
return (srcs);
}
static void
igmp_handle_group_exclude (igmp_config_t * config,
const igmp_membership_group_v3_t * igmp_group)
{
ip46_address_t key = {
.ip4 = igmp_group->group_address,
};
u16 n;
/*
* treat an exclude all sources as a *,G join
*/
n = clib_net_to_host_u16 (igmp_group->n_src_addresses);
if (0 == n)
{
ip46_address_t *src, *srcs;
igmp_group_t *group;
group = igmp_group_lookup (config, &key);
srcs = igmp_group_mk_source_list (igmp_group);
IGMP_DBG (" ..group-update: %U (*, %U)",
format_vnet_sw_if_index_name,
vnet_get_main (), config->sw_if_index, format_igmp_key, &key);
if (NULL == group)
{
group = igmp_group_alloc (config, &key, IGMP_FILTER_MODE_INCLUDE);
}
vec_foreach (src, srcs)
{
igmp_group_src_update (group, src, IGMP_MODE_ROUTER);
}
vec_free (srcs);
}
else
{
IGMP_DBG (" ..group-update: %U (*, %U) source exclude ignored",
format_vnet_sw_if_index_name,
vnet_get_main (), config->sw_if_index, format_igmp_key, &key);
}
}
static void
igmp_handle_group_block (igmp_config_t * config,
const igmp_membership_group_v3_t * igmp_group)
{
ip46_address_t *s, *srcs;
igmp_pkt_build_query_t bq;
igmp_group_t *group;
ip46_address_t key = {
.ip4 = igmp_group->group_address,
};
srcs = igmp_group_mk_source_list (igmp_group);
group = igmp_group_lookup (config, &key);
IGMP_DBG (" ..group-block: %U (%U, %U)",
format_vnet_sw_if_index_name,
vnet_get_main (), config->sw_if_index,
format_igmp_key, &key, format_igmp_src_addr_list, srcs);
if (group)
{
igmp_src_t *src;
/*
* send a group+source specific query
*/
igmp_pkt_build_query_init (&bq, config->sw_if_index);
igmp_pkt_query_v3_add_group (&bq, group, srcs);
igmp_pkt_query_v3_send (&bq);
/*
* for each source left/blocked drop the source expire timer to the leave
* latency timer
*/
vec_foreach (s, srcs)
{
src = igmp_src_lookup (group, s);
if (NULL != src)
igmp_src_blocked (src);
}
}
/*
* a block/leave from a group for which we have no state
*/
vec_free (srcs);
}
static void
igmp_handle_group_update (igmp_config_t * config,
const igmp_membership_group_v3_t * igmp_group)
{
ip46_address_t *src, *srcs;
igmp_group_t *group;
ip46_address_t key = {
.ip4 = igmp_group->group_address,
};
/*
* treat a TO_INC({}) as a (*,G) leave
*/
if (0 == clib_net_to_host_u16 (igmp_group->n_src_addresses))
{
return (igmp_handle_group_block (config, igmp_group));
}
srcs = igmp_group_mk_source_list (igmp_group);
group = igmp_group_lookup (config, &key);
IGMP_DBG (" ..group-update: %U (%U, %U)",
format_vnet_sw_if_index_name,
vnet_get_main (), config->sw_if_index,
format_igmp_key, &key, format_igmp_src_addr_list, srcs);
if (NULL == group)
{
group = igmp_group_alloc (config, &key, IGMP_FILTER_MODE_INCLUDE);
}
/* create or update all sources */
vec_foreach (src, srcs)
{
igmp_group_src_update (group, src, IGMP_MODE_ROUTER);
}
vec_free (srcs);
}
static void
igmp_handle_group (igmp_config_t * config,
const igmp_membership_group_v3_t * igmp_group)
{
IGMP_DBG ("rx-group-report: %U",
format_vnet_sw_if_index_name,
vnet_get_main (), config->sw_if_index);
switch (igmp_group->type)
{
case IGMP_MEMBERSHIP_GROUP_mode_is_include:
case IGMP_MEMBERSHIP_GROUP_change_to_include:
case IGMP_MEMBERSHIP_GROUP_allow_new_sources:
igmp_handle_group_update (config, igmp_group);
break;
case IGMP_MEMBERSHIP_GROUP_block_old_sources:
igmp_handle_group_block (config, igmp_group);
break;
case IGMP_MEMBERSHIP_GROUP_mode_is_exclude:
case IGMP_MEMBERSHIP_GROUP_change_to_exclude:
igmp_handle_group_exclude (config, igmp_group);
break;
/*
* all other types ignored
*/
}
}
void
igmp_handle_report (const igmp_report_args_t * args)
{
const igmp_membership_group_v3_t *igmp_group;
igmp_config_t *config;
u16 n_groups, ii;
config = igmp_config_lookup (args->sw_if_index);
if (!config)
/*
* no IGMP config on the interface. quit
*/
return;
if (IGMP_MODE_HOST == config->mode)
{
/*
* Hosts need not listen to the reports of other hosts.
* we're done here
*/
return;
}
/*
* we validated this packet when we accepted it in the DP, so
* this number is safe to use
*/
n_groups = clib_net_to_host_u16 (args->report[0].n_groups);
igmp_group = args->report[0].groups;
for (ii = 0; ii < n_groups; ii++)
{
igmp_handle_group (config, igmp_group);
igmp_group = group_cptr (igmp_group,
igmp_membership_group_v3_length (igmp_group));
}
igmp_proxy_device_merge_config (config, 0);
}
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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