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ip_input() changed. A configured netif accepts any traffic and an unconfigured netif accepts only DHCP traffic.

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Fixes bug #2004.
This commit is contained in:
likewise 2003-01-28 18:24:25 +00:00
parent 4a720425b7
commit 663b79ca72
1 changed files with 29 additions and 22 deletions
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51
src/core/ipv4/ip.c
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@ -312,31 +312,38 @@ ip_input(struct pbuf *p, struct netif *inp) {
netif->ip_addr.addr & netif->netmask.addr,
iphdr->dest.addr & ~(netif->netmask.addr)));
/* interface unconfigured? */
if(ip_addr_isany(&(netif->ip_addr)) ||
/* or unicast to this interface address? */
ip_addr_cmp(&(iphdr->dest), &(netif->ip_addr)) ||
/* or broadcast on this interface network address ? */
(ip_addr_isbroadcast(&(iphdr->dest), &(netif->netmask)) &&
ip_addr_maskcmp(&(iphdr->dest), &(netif->ip_addr), &(netif->netmask))) ||
/* or restricted broadcast? */
ip_addr_cmp(&(iphdr->dest), IP_ADDR_BROADCAST)) {
break;
/* interface configured? */
if(!ip_addr_isany(&(netif->ip_addr)))
{
/* unicast to this interface address? */
if(ip_addr_cmp(&(iphdr->dest), &(netif->ip_addr)) ||
/* or broadcast on this interface network address ? */
(ip_addr_isbroadcast(&(iphdr->dest), &(netif->netmask)) &&
ip_addr_maskcmp(&(iphdr->dest), &(netif->ip_addr), &(netif->netmask))) ||
/* or restricted broadcast? */
ip_addr_cmp(&(iphdr->dest), IP_ADDR_BROADCAST)) {
/* break out of for loop */
break;
}
}
#if LWIP_DHCP
/* Pass DHCP messages in case of an unconfigured (0.0.0.0) interface, regardless
of destination address. (DHCP replies are sent to the IP address-to-be. This
is according to RFC 1542 section 3.1.1, referred by RFC 2131). */
/* interface unconfigured (0.0.0.0) */
else {
/* remote port is DHCP server? */
if(IPH_PROTO(iphdr) == IP_PROTO_UDP &&
((struct udp_hdr *)((u8_t *)iphdr + IPH_HL(iphdr) * 4))->src == DHCP_SERVER_PORT) {
netif = inp;
/* break out of for loop */
break;
}
}
#endif /* LWIP_DHCP */
}
#if LWIP_DHCP
/* If a DHCP packet has arrived on the interface, we pass it up the
stack regardless of destination IP address. The reason is that
DHCP replies are sent to the IP adress that will be given to this
node (as recommended by RFC 1542 section 3.1.1, referred by RFC
2131). */
if(IPH_PROTO(iphdr) == IP_PROTO_UDP &&
((struct udp_hdr *)((u8_t *)iphdr + IPH_HL(iphdr) * 4))->src ==
DHCP_SERVER_PORT) {
netif = inp;
}
#endif /* LWIP_DHCP */
if(netif == NULL) {
/* packet not for us, route or discard */