[PATCH 1/2 net-next] ipv6: helper function to get tclass
From: Jiri Benc <hidden>
Date: 2012-02-09 19:34:45
Implement helper inline function to get traffic class from IPv6 header. Signed-off-by: Jiri Benc <redacted> --- include/linux/ipv6.h | 5 +++++ net/ipv6/datagram.c | 2 +- 2 files changed, 6 insertions(+), 1 deletion(-)
--- a/include/linux/ipv6.h
+++ b/include/linux/ipv6.h@@ -233,6 +233,11 @@ static inline struct ipv6hdr *ipipv6_hdr return (struct ipv6hdr *)skb_transport_header(skb); } +static inline __u8 ipv6_tclass(const struct ipv6hdr *iph) +{ + return (ntohl(*(__be32 *)iph) >> 20) & 0xff; +} + /* This structure contains results of exthdrs parsing as offsets from skb->nh. --- a/net/ipv6/datagram.c +++ b/net/ipv6/datagram.c
@@ -485,7 +485,7 @@ int datagram_recv_ctl(struct sock *sk, s } if (np->rxopt.bits.rxtclass) { - int tclass = (ntohl(*(__be32 *)ipv6_hdr(skb)) >> 20) & 0xff; + int tclass = ipv6_tclass(ipv6_hdr(skb)); put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); }