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ipv6: adjust MLD membership on address state changes

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If MLD support is enabled, each locally assigned IPv6 address in the
appropriate state must be a member of the solicited-node multicast
group corresponding to that address.  Ensure that this is always the
case by (re-)deciding on the membership upon every address state
change.  By doing so, this patch enforces that user-initiated state
changes to addresses (e.g., deletion) never cause a desynchronization
with the corresponding solicited-node multicast group membership,
thereby making such user-initiated state changes simpler and safer.
This commit is contained in:
David van Moolenbroek
2016-12-16 21:26:32 +00:00
committed by sg
parent d5bc856f45
commit 71810d0415
3 changed files with 44 additions and 13 deletions
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3
src/include/lwip/nd6.h
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@@ -71,6 +71,9 @@ u16_t nd6_get_destination_mtu(const ip6_addr_t *ip6addr, struct netif *netif);
void nd6_reachability_hint(const ip6_addr_t *ip6addr);
#endif /* LWIP_ND6_TCP_REACHABILITY_HINTS */
void nd6_cleanup_netif(struct netif *netif);
#if LWIP_IPV6_MLD
void nd6_adjust_mld_membership(struct netif *netif, s8_t addr_idx, u8_t new_state);
#endif /* LWIP_IPV6_MLD */
#ifdef __cplusplus
}