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fixed bug #35927: missing refragmentaion in ip_forward

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goldsimon 2012-03-22 19:35:04 +01:00
parent ca30f4b02e
commit d77b354377
2 changed files with 18 additions and 0 deletions
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3
CHANGELOG
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@ -62,6 +62,9 @@ HISTORY
++ Bugfixes:
2012-03-22: Simon Goldschmidt
* ip4.c: fixed bug #35927: missing refragmentaion in ip_forward
2012-03-20: Simon Goldschmidt (patch by Mason)
* netdb.c: fixed bug #35907: lwip_gethostbyname_r returns an invalid h_addr_list

15
src/core/ipv4/ip.c
View File

@ -223,6 +223,7 @@ ip_forward(struct pbuf *p, struct ip_hdr *iphdr, struct netif *inp)
LWIP_DEBUGF(IP_DEBUG, ("ip_forward: no forwarding route for %"U16_F".%"U16_F".%"U16_F".%"U16_F" found\n",
ip4_addr1_16(&current_iphdr_dest), ip4_addr2_16(&current_iphdr_dest),
ip4_addr3_16(&current_iphdr_dest), ip4_addr4_16(&current_iphdr_dest)));
/* @todo: send ICMP_DUR_NET? */
goto return_noroute;
}
#if !IP_FORWARD_ALLOW_TX_ON_RX_NETIF
@ -264,6 +265,20 @@ ip_forward(struct pbuf *p, struct ip_hdr *iphdr, struct netif *inp)
snmp_inc_ipforwdatagrams();
PERF_STOP("ip_forward");
/* don't fragment if interface has mtu set to 0 [loopif] */
if (netif->mtu && (p->tot_len > netif->mtu)) {
if ((IPH_OFFSET(iphdr) & PP_NTOHS(IP_DF)) == 0) {
#if IP_FRAG
ip_frag(p, netif, ip_current_dest_addr());
#else /* IP_FRAG */
/* @todo: send ICMP Destination Unreacheable code 13 "Communication administratively prohibited"? */
#endif /* IP_FRAG */
} else {
/* send ICMP Destination Unreacheable code 4: "Fragmentation Needed and DF Set" */
icmp_dest_unreach(p, ICMP_DUR_FRAG);
}
return;
}
/* transmit pbuf on chosen interface */
netif->output(netif, p, &current_iphdr_dest);
return;