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fixed bug #35595: Impossible to send broadcast without a gateway (introduced when fixing bug# 33551)

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This commit is contained in:
goldsimon 2012-02-23 10:14:27 +01:00
parent fc7da615fb
commit 7f81c62bf0
2 changed files with 46 additions and 42 deletions
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4
CHANGELOG
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@ -76,6 +76,10 @@ HISTORY
++ Bugfixes:
2012-02-23: Simon Goldschmidt
* etharp.c: fixed bug #35595: Impossible to send broadcast without a gateway
(introduced when fixing bug# 33551)
2012-02-16: Simon Goldschmidt
* ppp.c: fixed pbuf leak when PPP session is aborted through pppSigHUP()
(bug #35541: PPP Memory Leak)

84
src/netif/etharp.c
View File

@ -896,48 +896,6 @@ etharp_output(struct netif *netif, struct pbuf *q, ip_addr_t *ipaddr)
return ERR_BUF;
}
/* outside local network? if so, this can neither be a global broadcast nor
a subnet broadcast. */
if (!ip_addr_netcmp(ipaddr, &(netif->ip_addr), &(netif->netmask)) &&
!ip_addr_islinklocal(ipaddr) && !ip_addr_ismulticast(ipaddr)) {
#if LWIP_AUTOIP
struct ip_hdr *iphdr = (struct ip_hdr*)((u8_t*)q->payload +
sizeof(struct eth_hdr));
/* According to RFC 3297, chapter 2.6.2 (Forwarding Rules), a packet with
a link-local source address must always be "directly to its destination
on the same physical link. The host MUST NOT send the packet to any
router for forwarding". */
if (!ip_addr_islinklocal(&iphdr->src))
#endif /* LWIP_AUTOIP */
{
/* interface has default gateway? */
if (!ip_addr_isany(&netif->gw)) {
/* send to hardware address of default gateway IP address */
dst_addr = &(netif->gw);
/* no default gateway available */
} else {
/* no route to destination error (default gateway missing) */
return ERR_RTE;
}
}
}
#if LWIP_NETIF_HWADDRHINT
if (netif->addr_hint != NULL) {
/* per-pcb cached entry was given */
u8_t etharp_cached_entry = *(netif->addr_hint);
if (etharp_cached_entry < ARP_TABLE_SIZE) {
#endif /* LWIP_NETIF_HWADDRHINT */
if ((arp_table[etharp_cached_entry].state >= ETHARP_STATE_STABLE) &&
(ip_addr_cmp(dst_addr, &arp_table[etharp_cached_entry].ipaddr))) {
/* the per-pcb-cached entry is stable and the right one! */
ETHARP_STATS_INC(etharp.cachehit);
return etharp_output_to_arp_index(netif, q, etharp_cached_entry);
}
#if LWIP_NETIF_HWADDRHINT
}
}
#endif /* LWIP_NETIF_HWADDRHINT */
/* Determine on destination hardware address. Broadcasts and multicasts
* are special, other IP addresses are looked up in the ARP table. */
@ -959,6 +917,48 @@ etharp_output(struct netif *netif, struct pbuf *q, ip_addr_t *ipaddr)
/* unicast destination IP address? */
} else {
s8_t i;
/* outside local network? if so, this can neither be a global broadcast nor
a subnet broadcast. */
if (!ip_addr_netcmp(ipaddr, &(netif->ip_addr), &(netif->netmask)) &&
!ip_addr_islinklocal(ipaddr)) {
#if LWIP_AUTOIP
struct ip_hdr *iphdr = (struct ip_hdr*)((u8_t*)q->payload +
sizeof(struct eth_hdr));
/* According to RFC 3297, chapter 2.6.2 (Forwarding Rules), a packet with
a link-local source address must always be "directly to its destination
on the same physical link. The host MUST NOT send the packet to any
router for forwarding". */
if (!ip_addr_islinklocal(&iphdr->src))
#endif /* LWIP_AUTOIP */
{
/* interface has default gateway? */
if (!ip_addr_isany(&netif->gw)) {
/* send to hardware address of default gateway IP address */
dst_addr = &(netif->gw);
/* no default gateway available */
} else {
/* no route to destination error (default gateway missing) */
return ERR_RTE;
}
}
}
#if LWIP_NETIF_HWADDRHINT
if (netif->addr_hint != NULL) {
/* per-pcb cached entry was given */
u8_t etharp_cached_entry = *(netif->addr_hint);
if (etharp_cached_entry < ARP_TABLE_SIZE) {
#endif /* LWIP_NETIF_HWADDRHINT */
if ((arp_table[etharp_cached_entry].state >= ETHARP_STATE_STABLE) &&
(ip_addr_cmp(dst_addr, &arp_table[etharp_cached_entry].ipaddr))) {
/* the per-pcb-cached entry is stable and the right one! */
ETHARP_STATS_INC(etharp.cachehit);
return etharp_output_to_arp_index(netif, q, etharp_cached_entry);
}
#if LWIP_NETIF_HWADDRHINT
}
}
#endif /* LWIP_NETIF_HWADDRHINT */
/* find stable entry: do this here since this is a critical path for
throughput and etharp_find_entry() is kind of slow */
for (i = 0; i < ARP_TABLE_SIZE; i++) {