[PATCH] Add encap_rcv support to IPv6
From: Benjamin LaHaise <bcrl@kvack.org>
Date: 2012-03-20 13:58:56
At present, UDP encapsulated protocols (like L2TP) are only able to use the encap_rcv hook with UDP over IPv4. This patch adds the same support for use with UDP over IPv6. Signed-off-by: Benjamin LaHaise <bcrl@kvack.org> --- net/ipv6/udp.c | 31 +++++++++++++++++++++++++++++++ 1 files changed, 31 insertions(+), 0 deletions(-)
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 37b0699..4d7cd72 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c@@ -515,6 +515,37 @@ int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb) if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) goto drop; + if (up->encap_type) { + int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); + + /* + * This is an encapsulation socket so pass the skb to + * the socket's udp_encap_rcv() hook. Otherwise, just + * fall through and pass this up the UDP socket. + * up->encap_rcv() returns the following value: + * =0 if skb was successfully passed to the encap + * handler or was discarded by it. + * >0 if skb should be passed on to UDP. + * <0 if skb should be resubmitted as proto -N + */ + + /* if we're overly short, let UDP handle it */ + encap_rcv = ACCESS_ONCE(up->encap_rcv); + if (skb->len > sizeof(struct udphdr) && encap_rcv != NULL) { + int ret; + + ret = encap_rcv(sk, skb); + if (ret <= 0) { + UDP6_INC_STATS_BH(sock_net(sk), + UDP_MIB_INDATAGRAMS, + is_udplite); + return -ret; + } + } + + /* FALLTHROUGH -- it's a UDP Packet */ + } + /* * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). */
--
1.7.4.1