[PATCH 3.16 040/306] ipv4: accept u8 in IP_TOS ancillary data

From: Ben Hutchings
Date: Wed Feb 15 2017 - 18:39:00 EST

3.16.40-rc1 review patch. If anyone has any objections, please let me know.


From: Eric Dumazet <edumazet@xxxxxxxxxx>

commit e895cdce683161081e3626c4f5a5c55cb72089f8 upstream.

In commit f02db315b8d8 ("ipv4: IP_TOS and IP_TTL can be specified as
ancillary data") Francesco added IP_TOS values specified as integer.

However, kernel sends to userspace (at recvmsg() time) an IP_TOS value
in a single byte, when IP_RECVTOS is set on the socket.

It can be very useful to reflect all ancillary options as given by the
kernel in a subsequent sendmsg(), instead of aborting the sendmsg() with
EINVAL after Francesco patch.

So this patch extends IP_TOS ancillary to accept an u8, so that an UDP
server can simply reuse same ancillary block without having to mangle

Jesper can then augment
to add TOS reflection ;)

Fixes: f02db315b8d8 ("ipv4: IP_TOS and IP_TTL can be specified as ancillary data")
Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Cc: Francesco Fusco <ffusco@xxxxxxxxxx>
Cc: Jesper Dangaard Brouer <brouer@xxxxxxxxxx>
Acked-by: Jesper Dangaard Brouer <brouer@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
net/ipv4/ip_sockglue.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)

--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -242,9 +242,12 @@ int ip_cmsg_send(struct net *net, struct
ipc->ttl = val;
case IP_TOS:
- if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
+ if (cmsg->cmsg_len == CMSG_LEN(sizeof(int)))
+ val = *(int *)CMSG_DATA(cmsg);
+ else if (cmsg->cmsg_len == CMSG_LEN(sizeof(u8)))
+ val = *(u8 *)CMSG_DATA(cmsg);
+ else
return -EINVAL;
- val = *(int *)CMSG_DATA(cmsg);
if (val < 0 || val > 255)
return -EINVAL;
ipc->tos = val;