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Fix bug #49662: UDP layer should filter incoming multicast datagrams against the bound IP address

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Change lwIP UDP API to match socket behavior. Multicast traffic is now only received on a UDP PCB (and therefore on a UDP socket/netconn) when the PCB is bound to IP_ADDR_ANY.
This commit is contained in:
Dirk Ziegelmeier 2016-11-23 12:46:35 +01:00
parent 8c3c96baf7
commit 09547832ba
1 changed files with 2 additions and 9 deletions
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11
src/core/udp.c
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@ -178,15 +178,8 @@ udp_input_local_match(struct udp_pcb *pcb, struct netif *inp, u8_t broadcast)
} }
} else } else
#endif /* LWIP_IPV4 */ #endif /* LWIP_IPV4 */
/* Handle IPv4 and IPv6: all, multicast or exact match */ /* Handle IPv4 and IPv6: all or exact match */
if (ip_addr_isany(&pcb->local_ip) || if (ip_addr_isany(&pcb->local_ip) || ip_addr_cmp(&pcb->local_ip, ip_current_dest_addr())) {
#if LWIP_IPV6_MLD
(ip_current_is_v6() && ip6_addr_ismulticast(ip6_current_dest_addr())) ||
#endif /* LWIP_IPV6_MLD */
#if LWIP_IGMP
(!ip_current_is_v6() && ip4_addr_ismulticast(ip4_current_dest_addr())) ||
#endif /* LWIP_IGMP */
ip_addr_cmp(&pcb->local_ip, ip_current_dest_addr())) {
return 1; return 1;
} }
} }