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[IPV6]: Accept -1 for IPV6_TCLASS 

This patch should add support for -1 as "default" IPv6 traffic class,
as specified in IETF RFC3542 §6.5. Within the kernel, it seems tclass
< 0 is already handled, but setsockopt, getsockopt and recvmsg calls
won't accept it from userland.

Signed-off-by: Remi Denis-Courmont <rdenis@simphalempin.com>
Acked-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Remi Denis-Courmont 2006-09-13 20:08:07 -07:00 committed by David S. Miller
parent e012d51cbc
commit d0ee011f72
2 changed files with 4 additions and 2 deletions
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2
net/ipv6/datagram.c
View File

@ -696,7 +696,7 @@ int datagram_send_ctl(struct msghdr *msg, struct flowi *fl,
} }
tc = *(int *)CMSG_DATA(cmsg); tc = *(int *)CMSG_DATA(cmsg);
if (tc < 0 || tc > 0xff) if (tc < -1 || tc > 0xff)
goto exit_f; goto exit_f;
err = 0; err = 0;

4
net/ipv6/ipv6_sockglue.c
View File

@ -362,7 +362,7 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
break; break;
case IPV6_TCLASS: case IPV6_TCLASS:
if (val < 0 || val > 0xff) if (val < -1 || val > 0xff)
goto e_inval; goto e_inval;
np->tclass = val; np->tclass = val;
retv = 0; retv = 0;
@ -947,6 +947,8 @@ static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
case IPV6_TCLASS: case IPV6_TCLASS:
val = np->tclass; val = np->tclass;
if (val < 0)
val = 0;
break; break;
case IPV6_RECVTCLASS: case IPV6_RECVTCLASS: