[git commit] udhcpc: in comments, explain the kind of raw socket we create

[Denys Vlasenko]

commit: http://git.busybox.net/busybox/commit/?id=744ee5db1c2d6c34c1988343728b2fc37a908f83
branch: http://git.busybox.net/busybox/commit/?id=refs/heads/master

Signed-off-by: Denys Vlasenko <vda.linux at googlemail.com>
---
 networking/udhcp/dhcpc.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/networking/udhcp/dhcpc.c b/networking/udhcp/dhcpc.c
index ee19f55..bdb1e2b 100644
--- a/networking/udhcp/dhcpc.c
+++ b/networking/udhcp/dhcpc.c
@@ -979,6 +979,10 @@ static int udhcp_raw_socket(int ifindex)
 	log1("Opening raw socket on ifindex %d", ifindex); //log2?
 
 	fd = xsocket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP));
+	/* ^^^^^
+	 * SOCK_DGRAM: remove link-layer headers on input (SOCK_RAW keeps them)
+	 * ETH_P_IP: want to receive only packets with IPv4 eth type
+	 */
 	log1("Got raw socket fd"); //log2?
 
 	sock.sll_family = AF_PACKET;
@@ -1005,8 +1009,6 @@ static int udhcp_raw_socket(int ifindex)
 		 *
 		 * Copyright: 2006, 2007 Stefan Rompf <sux at loplof.de>.
 		 * License: GPL v2.
-		 *
-		 * TODO: make conditional?
 		 */
 		static const struct sock_filter filter_instr[] = {
 			/* load 9th byte (protocol) */