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udhcpc: in comments, explain the kind of raw socket we create

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2014-02-07 17:38:52 +01:00
parent 3ba2df874c
commit 744ee5db1c
1 changed files with 4 additions and 2 deletions
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6
networking/udhcp/dhcpc.c
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@ -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@loplof.de>.
* License: GPL v2.
*
* TODO: make conditional?
*/
static const struct sock_filter filter_instr[] = {
/* load 9th byte (protocol) */