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ip_forward() returns netif on which packet was forwarded.

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This commit is contained in:
likewise 2004-06-30 18:39:17 +00:00
parent d11fcafad8
commit 31c1e72b8c
1 changed files with 29 additions and 24 deletions
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33
src/core/ipv4/ip.c
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@ -101,7 +101,7 @@ ip_route(struct ip_addr *dest)
* checksum and outputs the packet on the appropriate interface. * checksum and outputs the packet on the appropriate interface.
*/ */
static void static struct netif *
ip_forward(struct pbuf *p, struct ip_hdr *iphdr, struct netif *inp) ip_forward(struct pbuf *p, struct ip_hdr *iphdr, struct netif *inp)
{ {
struct netif *netif; struct netif *netif;
@ -113,14 +113,14 @@ ip_forward(struct pbuf *p, struct ip_hdr *iphdr, struct netif *inp)
LWIP_DEBUGF(IP_DEBUG, ("ip_forward: no forwarding route for 0x%lx found\n", LWIP_DEBUGF(IP_DEBUG, ("ip_forward: no forwarding route for 0x%lx found\n",
iphdr->dest.addr)); iphdr->dest.addr));
snmp_inc_ipnoroutes(); snmp_inc_ipnoroutes();
return; return (struct netif *)NULL;
} }
/* Do not forward packets onto the same network interface on which /* Do not forward packets onto the same network interface on which
* they arrived. */ * they arrived. */
if (netif == inp) { if (netif == inp) {
LWIP_DEBUGF(IP_DEBUG, ("ip_forward: not bouncing packets back on incoming interface.\n")); LWIP_DEBUGF(IP_DEBUG, ("ip_forward: not bouncing packets back on incoming interface.\n"));
snmp_inc_ipnoroutes(); snmp_inc_ipnoroutes();
return; return (struct netif *)NULL;
} }
/* decrement TTL */ /* decrement TTL */
@ -132,7 +132,7 @@ ip_forward(struct pbuf *p, struct ip_hdr *iphdr, struct netif *inp)
icmp_time_exceeded(p, ICMP_TE_TTL); icmp_time_exceeded(p, ICMP_TE_TTL);
snmp_inc_icmpouttimeexcds(); snmp_inc_icmpouttimeexcds();
} }
return; return (struct netif *)NULL;
} }
/* Incrementally update the IP checksum. */ /* Incrementally update the IP checksum. */
@ -152,6 +152,7 @@ ip_forward(struct pbuf *p, struct ip_hdr *iphdr, struct netif *inp)
PERF_STOP("ip_forward"); PERF_STOP("ip_forward");
/* transmit pbuf on chosen interface */ /* transmit pbuf on chosen interface */
netif->output(netif, p, (struct ip_addr *)&(iphdr->dest)); netif->output(netif, p, (struct ip_addr *)&(iphdr->dest));
return netif;
} }
#endif /* IP_FORWARD */ #endif /* IP_FORWARD */
@ -163,13 +164,16 @@ ip_forward(struct pbuf *p, struct ip_hdr *iphdr, struct netif *inp)
* forwarded (using ip_forward). The IP checksum is always checked. * forwarded (using ip_forward). The IP checksum is always checked.
* *
* Finally, the packet is sent to the upper layer protocol input function. * Finally, the packet is sent to the upper layer protocol input function.
*
*
*
*/ */
err_t err_t
ip_input(struct pbuf *p, struct netif *inp) { ip_input(struct pbuf *p, struct netif *inp) {
static struct ip_hdr *iphdr; struct ip_hdr *iphdr;
static struct netif *netif; struct netif *netif;
static u16_t iphdrlen; u16_t iphdrlen;
IP_STATS_INC(ip.recv); IP_STATS_INC(ip.recv);
snmp_inc_ipinreceives(); snmp_inc_ipinreceives();
@ -220,8 +224,8 @@ ip_input(struct pbuf *p, struct netif *inp) {
* but we'll do it anyway just to be sure that its done. */ * but we'll do it anyway just to be sure that its done. */
pbuf_realloc(p, ntohs(IPH_LEN(iphdr))); pbuf_realloc(p, ntohs(IPH_LEN(iphdr)));
/* is this packet for us? */ /* match packet against an interface, i.e. is this packet for us? */
for(netif = netif_list; netif != NULL; netif = netif->next) { for (netif = netif_list; netif != NULL; netif = netif->next) {
LWIP_DEBUGF(IP_DEBUG, ("ip_input: iphdr->dest 0x%lx netif->ip_addr 0x%lx (0x%lx, 0x%lx, 0x%lx)\n", LWIP_DEBUGF(IP_DEBUG, ("ip_input: iphdr->dest 0x%lx netif->ip_addr 0x%lx (0x%lx, 0x%lx, 0x%lx)\n",
iphdr->dest.addr, netif->ip_addr.addr, iphdr->dest.addr, netif->ip_addr.addr,
@ -229,8 +233,8 @@ ip_input(struct pbuf *p, struct netif *inp) {
netif->ip_addr.addr & netif->netmask.addr, netif->ip_addr.addr & netif->netmask.addr,
iphdr->dest.addr & ~(netif->netmask.addr))); iphdr->dest.addr & ~(netif->netmask.addr)));
/* interface configured? */ /* interface is up and configured? */
if (!ip_addr_isany(&(netif->ip_addr))) if ((netif_is_up(netif)) && (!ip_addr_isany(&(netif->ip_addr))))
{ {
/* unicast to this interface address? */ /* unicast to this interface address? */
if (ip_addr_cmp(&(iphdr->dest), &(netif->ip_addr)) || if (ip_addr_cmp(&(iphdr->dest), &(netif->ip_addr)) ||
@ -249,7 +253,8 @@ ip_input(struct pbuf *p, struct netif *inp) {
#if LWIP_DHCP #if LWIP_DHCP
/* Pass DHCP messages regardless of destination address. DHCP traffic is addressed /* Pass DHCP messages regardless of destination address. DHCP traffic is addressed
* using link layer addressing (such as Ethernet MAC) so we must not filter on IP. * using link layer addressing (such as Ethernet MAC) so we must not filter on IP.
* According to RFC 1542 section 3.1.1, referred by RFC 2131). */ * According to RFC 1542 section 3.1.1, referred by RFC 2131).
*/
if (netif == NULL) { if (netif == NULL) {
/* remote port is DHCP server? */ /* remote port is DHCP server? */
if (IPH_PROTO(iphdr) == IP_PROTO_UDP) { if (IPH_PROTO(iphdr) == IP_PROTO_UDP) {
@ -375,8 +380,8 @@ ip_output_if(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
u8_t ttl, u8_t tos, u8_t ttl, u8_t tos,
u8_t proto, struct netif *netif) u8_t proto, struct netif *netif)
{ {
static struct ip_hdr *iphdr; struct ip_hdr *iphdr;
static u16_t ip_id = 0; u16_t ip_id = 0;
snmp_inc_ipoutrequests(); snmp_inc_ipoutrequests();