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Fix bug #39145: IGMP membership report for 224.0.0.1

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Ensure allsystems group is always first in linked list
This commit is contained in:
Dirk Ziegelmeier 2016-12-17 13:36:24 +01:00
parent bb8088d498
commit 102a50fa96
1 changed files with 16 additions and 3 deletions
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19
src/core/ipv4/igmp.c
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@ -244,6 +244,7 @@ struct igmp_group *
igmp_lookup_group(struct netif *ifp, const ip4_addr_t *addr)
{
struct igmp_group *group;
struct igmp_group *list_head = netif_igmp_data(ifp);
/* Search if the group already exists */
group = igmp_lookfor_group(ifp, addr);
@ -251,7 +252,7 @@ igmp_lookup_group(struct netif *ifp, const ip4_addr_t *addr)
/* Group already exists. */
return group;
}
/* Group doesn't exist yet, create a new one */
group = (struct igmp_group *)memp_malloc(MEMP_IGMP_GROUP);
if (group != NULL) {
@ -260,9 +261,21 @@ igmp_lookup_group(struct netif *ifp, const ip4_addr_t *addr)
group->group_state = IGMP_GROUP_NON_MEMBER;
group->last_reporter_flag = 0;
group->use = 0;
group->next = netif_igmp_data(ifp);
netif_set_client_data(ifp, LWIP_NETIF_CLIENT_DATA_INDEX_IGMP, group);
/* Ensure allsystems group is always first in list */
if (list_head == NULL) {
/* this is the first entry in linked list */
LWIP_ASSERT("igmp_lookup_group: first group must be allsystems",
(ip4_addr_cmp(addr, &allsystems) != 0));
group->next = NULL;
netif_set_client_data(ifp, LWIP_NETIF_CLIENT_DATA_INDEX_IGMP, group);
} else {
/* append _after_ first entry */
LWIP_ASSERT("igmp_lookup_group: all except first group must not be allsystems",
(ip4_addr_cmp(addr, &allsystems) == 0));
group->next = list_head->next;
list_head->next = group;
}
}
LWIP_DEBUGF(IGMP_DEBUG, ("igmp_lookup_group: %sallocated a new group with address ", (group?"":"impossible to ")));