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ip4: fix swapped src/dst params with ip4_route_src

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This fixes a couple of occurrences where the src and dst parameters to
ip4_route_src() were swapped. This was most likely due to confusion between
ip_route(src, dst) and ip4_route_src(dst, src)

This was found in a system where LWIP_IPV4_SRC_ROUTING is 0

The UDP case was an application socket bound to INADDR_ANY with
IP_MULTICAST_IF set. Transmits would result in calling ip4_route(dst) where
dst was pcb->local_addr (which was INADDR_ANY) instead of pcb->mcast_ip4.
This resulted in a routing failure

The ICMP issue was found through code analysis only
This commit is contained in:
Joel Cunningham 2017-07-28 16:36:57 -05:00
parent 006bb84368
commit 2b2ea50cb1
2 changed files with 2 additions and 2 deletions
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2
src/core/ipv4/icmp.c
View File

@ -380,7 +380,7 @@ icmp_send_response(struct pbuf *p, u8_t type, u8_t code)
{
ip4_addr_t iphdr_dst;
ip4_addr_copy(iphdr_dst, iphdr->dest);
netif = ip4_route_src(&iphdr_src, &iphdr_dst);
netif = ip4_route_src(&iphdr_dst, &iphdr_src);
}
#else
netif = ip4_route(&iphdr_src);

2
src/core/udp.c
View File

@ -539,7 +539,7 @@ udp_sendto_chksum(struct udp_pcb *pcb, struct pbuf *p, const ip_addr_t *dst_ip,
fails, we try regular routing as though no override was set. */
if (!ip4_addr_isany_val(pcb->mcast_ip4) &&
!ip4_addr_cmp(&pcb->mcast_ip4, IP4_ADDR_BROADCAST)) {
netif = ip4_route_src(ip_2_ip4(&pcb->local_ip), &pcb->mcast_ip4);
netif = ip4_route_src(&pcb->mcast_ip4, ip_2_ip4(&pcb->local_ip));
}
}
#endif /* LWIP_IPV4 */