[IPV6]: Accept -1 for IPV6_TCLASS (d0ee011f) · Commits · 戴 / test

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>

net/ipv6/datagram.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -696,7 +696,7 @@ int datagram_send_ctl(struct msghdr msg, struct flowi fl,
		}

		tc = (int )CMSG_DATA(cmsg);
		if (tc < 0 \|\| tc > 0xff)
		if (tc < -1 \|\| tc > 0xff)
		goto exit_f;

		err = 0;

net/ipv6/ipv6_sockglue.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -362,7 +362,7 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
		break;

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

		case IPV6_TCLASS:
		val = np->tclass;
		if (val < 0)
		val = 0;
		break;

		case IPV6_RECVTCLASS:

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