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refactor ip4/ip6 packet-to-netif matching to remove the ugly 'first' flag

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This commit is contained in:
goldsimon
2017-03-01 14:09:18 +01:00
parent ec4f00179d
commit 7c9a6317b9
2 changed files with 113 additions and 105 deletions
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110
src/core/ipv4/ip4.c
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@@ -356,6 +356,45 @@ return_noroute:
}
#endif /* IP_FORWARD */
/** Return true if the current input packet should be accepted on this netif */
static struct netif*
ip4_input_accept(struct netif *netif)
{
LWIP_DEBUGF(IP_DEBUG, ("ip_input: iphdr->dest 0x%"X32_F" netif->ip_addr 0x%"X32_F" (0x%"X32_F", 0x%"X32_F", 0x%"X32_F")\n",
ip4_addr_get_u32(ip4_current_dest_addr()), ip4_addr_get_u32(netif_ip4_addr(netif)),
ip4_addr_get_u32(ip4_current_dest_addr()) & ip4_addr_get_u32(netif_ip4_netmask(netif)),
ip4_addr_get_u32(netif_ip4_addr(netif)) & ip4_addr_get_u32(netif_ip4_netmask(netif)),
ip4_addr_get_u32(ip4_current_dest_addr()) & ~ip4_addr_get_u32(netif_ip4_netmask(netif))));
/* interface is up and configured? */
if ((netif_is_up(netif)) && (!ip4_addr_isany_val(*netif_ip4_addr(netif)))) {
/* unicast to this interface address? */
if (ip4_addr_cmp(ip4_current_dest_addr(), netif_ip4_addr(netif)) ||
/* or broadcast on this interface network address? */
ip4_addr_isbroadcast(ip4_current_dest_addr(), netif)
#if LWIP_NETIF_LOOPBACK && !LWIP_HAVE_LOOPIF
|| (ip4_addr_get_u32(ip4_current_dest_addr()) == PP_HTONL(IPADDR_LOOPBACK))
#endif /* LWIP_NETIF_LOOPBACK && !LWIP_HAVE_LOOPIF */
) {
LWIP_DEBUGF(IP_DEBUG, ("ip4_input: packet accepted on interface %c%c\n",
netif->name[0], netif->name[1]));
/* accept on this netif */
return netif;
}
#if LWIP_AUTOIP
/* connections to link-local addresses must persist after changing
the netif's address (RFC3927 ch. 1.9) */
if (autoip_accept_packet(netif, ip4_current_dest_addr())) {
LWIP_DEBUGF(IP_DEBUG, ("ip4_input: LLA packet accepted on interface %c%c\n",
netif->name[0], netif->name[1]));
/* accept on this netif */
return netif;
}
#endif /* LWIP_AUTOIP */
}
return NULL;
}
/**
* This function is called by the network interface device driver when
* an IP packet is received. The function does the basic checks of the
@@ -484,62 +523,27 @@ ip4_input(struct pbuf *p, struct netif *inp)
#endif /* LWIP_IGMP */
} else {
/* start trying with inp. if that's not acceptable, start walking the
list of configured netifs.
'first' is used as a boolean to mark whether we started walking the list */
int first = 1;
netif = inp;
do {
LWIP_DEBUGF(IP_DEBUG, ("ip_input: iphdr->dest 0x%"X32_F" netif->ip_addr 0x%"X32_F" (0x%"X32_F", 0x%"X32_F", 0x%"X32_F")\n",
ip4_addr_get_u32(&iphdr->dest), ip4_addr_get_u32(netif_ip4_addr(netif)),
ip4_addr_get_u32(&iphdr->dest) & ip4_addr_get_u32(netif_ip4_netmask(netif)),
ip4_addr_get_u32(netif_ip4_addr(netif)) & ip4_addr_get_u32(netif_ip4_netmask(netif)),
ip4_addr_get_u32(&iphdr->dest) & ~ip4_addr_get_u32(netif_ip4_netmask(netif))));
/* interface is up and configured? */
if ((netif_is_up(netif)) && (!ip4_addr_isany_val(*netif_ip4_addr(netif)))) {
/* unicast to this interface address? */
if (ip4_addr_cmp(ip4_current_dest_addr(), netif_ip4_addr(netif)) ||
/* or broadcast on this interface network address? */
ip4_addr_isbroadcast(ip4_current_dest_addr(), netif)
#if LWIP_NETIF_LOOPBACK && !LWIP_HAVE_LOOPIF
|| (ip4_addr_get_u32(ip4_current_dest_addr()) == PP_HTONL(IPADDR_LOOPBACK))
#endif /* LWIP_NETIF_LOOPBACK && !LWIP_HAVE_LOOPIF */
) {
LWIP_DEBUGF(IP_DEBUG, ("ip4_input: packet accepted on interface %c%c\n",
netif->name[0], netif->name[1]));
/* break out of for loop */
break;
}
#if LWIP_AUTOIP
/* connections to link-local addresses must persist after changing
the netif's address (RFC3927 ch. 1.9) */
if (autoip_accept_packet(netif, ip4_current_dest_addr())) {
LWIP_DEBUGF(IP_DEBUG, ("ip4_input: LLA packet accepted on interface %c%c\n",
netif->name[0], netif->name[1]));
/* break out of for loop */
break;
}
#endif /* LWIP_AUTOIP */
}
if (first) {
list of configured netifs. */
netif = ip4_input_accept(inp);
if (netif == NULL) {
#if !LWIP_NETIF_LOOPBACK || LWIP_HAVE_LOOPIF
/* Packets sent to the loopback address must not be accepted on an
* interface that does not have the loopback address assigned to it,
* unless a non-loopback interface is used for loopback traffic. */
if (ip4_addr_isloopback(ip4_current_dest_addr())) {
netif = NULL;
break;
}
/* Packets sent to the loopback address must not be accepted on an
* interface that does not have the loopback address assigned to it,
* unless a non-loopback interface is used for loopback traffic. */
if (!ip4_addr_isloopback(ip4_current_dest_addr()))
#endif /* !LWIP_NETIF_LOOPBACK || LWIP_HAVE_LOOPIF */
first = 0;
netif = netif_list;
} else {
netif = netif->next;
{
NETIF_FOREACH(netif) {
if (netif == inp) {
/* we checked that before already */
continue;
}
if (ip4_input_accept(netif)) {
break;
}
}
}
if (netif == inp) {
netif = netif->next;
}
} while (netif != NULL);
}
}
#if IP_ACCEPT_LINK_LAYER_ADDRESSING