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-rw-r--r--net/net.c101
1 files changed, 58 insertions, 43 deletions
diff --git a/net/net.c b/net/net.c
index 5e67886..266b953 100644
--- a/net/net.c
+++ b/net/net.c
@@ -1331,6 +1331,62 @@ static inline IP_t *NetDefragment(IP_t *ip, int *lenp)
}
#endif
+/**
+ * Receive an ICMP packet. We deal with REDIRECT and PING here, and silently
+ * drop others.
+ *
+ * @parma ip IP packet containing the ICMP
+ */
+static void receive_icmp(IP_t *ip, int len, IPaddr_t src_ip, Ethernet_t *et)
+{
+ ICMP_t *icmph = (ICMP_t *)&ip->udp_src;
+
+ switch (icmph->type) {
+ case ICMP_REDIRECT:
+ if (icmph->code != ICMP_REDIR_HOST)
+ return;
+ printf(" ICMP Host Redirect to %pI4 ",
+ &icmph->un.gateway);
+ break;
+#if defined(CONFIG_CMD_PING)
+ case ICMP_ECHO_REPLY:
+ /*
+ * IP header OK. Pass the packet to the
+ * current handler.
+ */
+ /*
+ * XXX point to ip packet - should this use
+ * packet_icmp_handler?
+ */
+ (*packetHandler)((uchar *)ip, 0, src_ip, 0, 0);
+ break;
+ case ICMP_ECHO_REQUEST:
+ debug("Got ICMP ECHO REQUEST, return %d bytes\n",
+ ETHER_HDR_SIZE + len);
+
+ memcpy(&et->et_dest[0], &et->et_src[0], 6);
+ memcpy(&et->et_src[0], NetOurEther, 6);
+
+ ip->ip_sum = 0;
+ ip->ip_off = 0;
+ NetCopyIP((void *)&ip->ip_dst, &ip->ip_src);
+ NetCopyIP((void *)&ip->ip_src, &NetOurIP);
+ ip->ip_sum = ~NetCksum((uchar *)ip,
+ IP_HDR_SIZE_NO_UDP >> 1);
+
+ icmph->type = ICMP_ECHO_REPLY;
+ icmph->checksum = 0;
+ icmph->checksum = ~NetCksum((uchar *)icmph,
+ (len - IP_HDR_SIZE_NO_UDP) >> 1);
+ (void) eth_send((uchar *)et,
+ ETHER_HDR_SIZE + len);
+ break;
+#endif
+ default:
+ break;
+ }
+}
+
void
NetReceive(volatile uchar *inpkt, int len)
{
@@ -1617,49 +1673,8 @@ NetReceive(volatile uchar *inpkt, int len)
* sure if there aren't any other situations.
*/
if (ip->ip_p == IPPROTO_ICMP) {
- ICMP_t *icmph = (ICMP_t *)&(ip->udp_src);
-
- switch (icmph->type) {
- case ICMP_REDIRECT:
- if (icmph->code != ICMP_REDIR_HOST)
- return;
- printf(" ICMP Host Redirect to %pI4 ",
- &icmph->un.gateway);
- return;
-#if defined(CONFIG_CMD_PING)
- case ICMP_ECHO_REPLY:
- /*
- * IP header OK. Pass the packet to the
- * current handler.
- */
- /* XXX point to ip packet */
- (*packetHandler)((uchar *)ip, 0, src_ip, 0, 0);
- return;
- case ICMP_ECHO_REQUEST:
- debug("Got ICMP ECHO REQUEST, return %d bytes\n",
- ETHER_HDR_SIZE + len);
-
- memcpy(&et->et_dest[0], &et->et_src[0], 6);
- memcpy(&et->et_src[0], NetOurEther, 6);
-
- ip->ip_sum = 0;
- ip->ip_off = 0;
- NetCopyIP((void *)&ip->ip_dst, &ip->ip_src);
- NetCopyIP((void *)&ip->ip_src, &NetOurIP);
- ip->ip_sum = ~NetCksum((uchar *)ip,
- IP_HDR_SIZE_NO_UDP >> 1);
-
- icmph->type = ICMP_ECHO_REPLY;
- icmph->checksum = 0;
- icmph->checksum = ~NetCksum((uchar *)icmph,
- (len - IP_HDR_SIZE_NO_UDP) >> 1);
- (void) eth_send((uchar *)et,
- ETHER_HDR_SIZE + len);
- return;
-#endif
- default:
- return;
- }
+ receive_icmp(ip, len, src_ip, et);
+ return;
} else if (ip->ip_p != IPPROTO_UDP) { /* Only UDP packets */
return;
}