Erich E. Hoover 76e21053b5 ipv4: Implement IP_UNICAST_IF socket option.
The IP_UNICAST_IF feature is needed by the Wine project.  This patch
implements the feature by setting the outgoing interface in a similar
fashion to that of IP_MULTICAST_IF.  A separate option is needed to
handle this feature since the existing options do not provide all of
the characteristics required by IP_UNICAST_IF, a summary is provided
below.

SO_BINDTODEVICE:
* SO_BINDTODEVICE requires administrative privileges, IP_UNICAST_IF
does not.  From reading some old mailing list articles my
understanding is that SO_BINDTODEVICE requires administrative
privileges because it can override the administrator's routing
settings.
* The SO_BINDTODEVICE option restricts both outbound and inbound
traffic, IP_UNICAST_IF only impacts outbound traffic.

IP_PKTINFO:
* Since IP_PKTINFO and IP_UNICAST_IF are independent options,
implementing IP_UNICAST_IF with IP_PKTINFO will likely break some
applications.
* Implementing IP_UNICAST_IF on top of IP_PKTINFO significantly
complicates the Wine codebase and reduces the socket performance
(doing this requires a lot of extra communication between the
"server" and "user" layers).

bind():
* bind() does not work on broadcast packets, IP_UNICAST_IF is
specifically intended to work with broadcast packets.
* Like SO_BINDTODEVICE, bind() restricts both outbound and inbound
traffic.

Signed-off-by: Erich E. Hoover <ehoover@mines.edu>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-02-08 15:52:45 -05:00
..
2011-03-31 11:26:23 -03:00
2011-03-31 11:26:23 -03:00
2012-01-22 15:08:43 -05:00
2011-03-31 11:26:23 -03:00
2012-01-24 15:41:51 +02:00
2011-07-22 08:25:37 -07:00
2011-11-02 16:07:03 -07:00
2011-07-20 20:47:43 -04:00
2011-10-26 15:43:25 -04:00
2011-07-26 16:49:47 -07:00
2011-03-22 17:43:59 -07:00
2011-03-11 14:25:50 +00:00
2011-07-26 16:49:47 -07:00
2011-08-03 11:30:42 -04:00
2011-07-31 22:05:09 +02:00
2011-07-26 16:49:47 -07:00
2011-03-31 11:26:23 -03:00
2011-03-31 11:26:23 -03:00
2011-03-31 11:26:23 -03:00
2012-01-10 16:30:42 -08:00
2012-01-03 22:54:57 -05:00
2011-08-25 16:25:33 -07:00
2011-10-29 21:20:22 +02:00
2011-03-31 11:26:23 -03:00
2011-03-22 17:44:15 -07:00
2011-07-06 14:44:42 -07:00
2011-07-25 20:57:16 -07:00
2011-12-13 09:26:45 +00:00
2011-07-05 23:42:17 -07:00
2011-07-26 16:49:47 -07:00
2011-11-07 23:54:53 +01:00
2011-05-23 10:47:06 -05:00
2012-01-04 08:56:31 -06:00
2011-05-29 13:03:09 +01:00
2011-10-31 20:19:04 +00:00
2011-03-10 11:35:17 +01:00
2011-05-24 10:21:29 +02:00
2011-11-26 14:59:39 -05:00
2011-12-09 17:35:51 -08:00
2011-12-11 18:25:16 -05:00
2012-01-12 20:13:04 -08:00
2011-09-14 15:24:51 -04:00
2011-03-31 11:26:23 -03:00
2012-01-03 22:54:58 -05:00
2011-03-14 19:12:20 -04:00
2011-07-26 16:49:47 -07:00
2011-07-26 16:49:47 -07:00
2011-12-13 11:58:49 +01:00
2011-07-01 15:34:45 -07:00
2011-03-31 11:26:23 -03:00
2011-06-28 10:48:34 +02:00
2012-01-12 20:13:08 -08:00
2011-02-23 00:53:26 +00:00
2011-03-31 11:26:23 -03:00
2011-07-01 10:37:15 +02:00
2012-01-03 22:54:56 -05:00
2011-11-13 16:10:10 -05:00
2011-07-21 13:47:54 -07:00
2012-01-03 22:55:17 -05:00
2011-12-11 18:25:16 -05:00
2011-09-27 18:08:04 +02:00
2011-03-31 11:26:23 -03:00
2012-01-09 13:52:09 +01:00
2011-07-26 16:49:47 -07:00
2012-01-12 20:13:11 -08:00
2012-01-17 15:40:51 -08:00
2011-03-31 11:26:23 -03:00
2011-12-27 11:26:41 +02:00
2011-09-16 19:20:20 -04:00
2011-04-25 18:14:10 -07:00
2011-07-26 16:49:47 -07:00
2012-01-12 20:13:10 -08:00
2011-07-26 16:49:47 -07:00
2011-11-14 00:47:54 -05:00
2011-07-31 12:18:16 -04:00
2012-01-30 15:48:25 -05:00
2011-10-31 14:03:22 +01:00
2012-01-06 12:10:26 -08:00
2012-01-12 15:23:04 -08:00
2011-05-26 17:12:37 -07:00
2011-12-13 09:26:45 +00:00
2011-03-31 11:26:23 -03:00
2011-11-02 16:07:02 -07:00
2011-03-31 11:26:23 -03:00
2011-03-31 11:26:23 -03:00
2012-01-03 22:55:07 -05:00
2012-01-03 22:54:56 -05:00
2011-07-26 14:50:01 -07:00
2011-06-07 10:02:35 +02:00
2012-01-03 22:52:40 -05:00
2012-01-09 09:33:57 +09:00
2011-07-30 08:44:19 -10:00
2011-03-31 11:26:23 -03:00
2011-07-26 16:49:47 -07:00
2011-12-13 09:26:45 +00:00
2011-07-26 16:49:47 -07:00
2011-07-25 20:57:11 -07:00
2011-10-31 17:30:47 -07:00
2011-08-16 00:16:49 -07:00
2011-08-03 14:25:22 -10:00
2012-01-03 22:54:56 -05:00
2012-02-01 02:11:47 -05:00
2011-06-27 20:30:08 +02:00
2011-06-07 09:05:42 -07:00
2012-01-24 12:25:14 -08:00
2011-11-02 16:07:02 -07:00
2011-03-31 11:26:23 -03:00
2011-07-26 16:49:47 -07:00
2011-03-31 11:26:23 -03:00
2011-09-14 15:24:51 -04:00
2011-03-31 11:26:23 -03:00