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Commit 7a3198a8 authored by Jiri Benc's avatar Jiri Benc Committed by David S. Miller
Browse files

ipv6: helper function to get tclass 



Implement helper inline function to get traffic class from IPv6 header.

Signed-off-by: default avatarJiri Benc <jbenc@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 72e60278

include/linux/ipv6.h

+5 −0
Original line number Diff line number Diff line
@@ -233,6 +233,11 @@ static inline struct ipv6hdr *ipipv6_hdr(const struct sk_buff *skb) 
	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.

net/ipv6/datagram.c

+1 −1
Original line number Diff line number Diff line
@@ -485,7 +485,7 @@ int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb) 
	}



	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);

	}