From 5472d94b73d104af5e3865ee6e24927184b8b212 Mon Sep 17 00:00:00 2001
From: likewise <likewise>
Date: Wed, 11 Dec 2002 00:21:12 +0000
Subject: [PATCH] Added comment to ip_input() packet filter.

---
 src/core/ipv4/ip.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/core/ipv4/ip.c b/src/core/ipv4/ip.c
index d230f5ec..30c85026 100644
--- a/src/core/ipv4/ip.c
+++ b/src/core/ipv4/ip.c
@@ -312,10 +312,14 @@ ip_input(struct pbuf *p, struct netif *inp) {
 		      netif->ip_addr.addr & netif->netmask.addr,
 		      iphdr->dest.addr & ~(netif->netmask.addr)));
 
+    /* interface unconfigured? */
     if(ip_addr_isany(&(netif->ip_addr)) ||
+       /* or unicast to this interface address? */
        ip_addr_cmp(&(iphdr->dest), &(netif->ip_addr)) ||
+       /* or broadcast on this interface network address ? */
        (ip_addr_isbroadcast(&(iphdr->dest), &(netif->netmask)) &&
 	ip_addr_maskcmp(&(iphdr->dest), &(netif->ip_addr), &(netif->netmask))) ||
+       /* or restricted broadcast? */
        ip_addr_cmp(&(iphdr->dest), IP_ADDR_BROADCAST)) {
       break;
     }