* [PATCH net-next 1/2] net/ipv6/udp: Add encap_rcv support to IPv6 UDP
@ 2012-04-11 2:20 Benjamin LaHaise
2012-04-11 11:51 ` James Chapman
2012-04-13 17:24 ` David Miller
0 siblings, 2 replies; 3+ messages in thread
From: Benjamin LaHaise @ 2012-04-11 2:20 UTC (permalink / raw)
To: David S. Miller, James Chapman; +Cc: netdev
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
--
"Thought is the essence of where you are now."
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH net-next 1/2] net/ipv6/udp: Add encap_rcv support to IPv6 UDP
2012-04-11 2:20 [PATCH net-next 1/2] net/ipv6/udp: Add encap_rcv support to IPv6 UDP Benjamin LaHaise
@ 2012-04-11 11:51 ` James Chapman
2012-04-13 17:24 ` David Miller
1 sibling, 0 replies; 3+ messages in thread
From: James Chapman @ 2012-04-11 11:51 UTC (permalink / raw)
To: Benjamin LaHaise; +Cc: David S. Miller, netdev
On 11/04/12 03:20, Benjamin LaHaise wrote:
> 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>
Signed-off-by: James Chapman <jchapman@katalix.com>
> ---
> 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).
> */
--
James Chapman
Katalix Systems Ltd
http://www.katalix.com
Catalysts for your Embedded Linux software development
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH net-next 1/2] net/ipv6/udp: Add encap_rcv support to IPv6 UDP
2012-04-11 2:20 [PATCH net-next 1/2] net/ipv6/udp: Add encap_rcv support to IPv6 UDP Benjamin LaHaise
2012-04-11 11:51 ` James Chapman
@ 2012-04-13 17:24 ` David Miller
1 sibling, 0 replies; 3+ messages in thread
From: David Miller @ 2012-04-13 17:24 UTC (permalink / raw)
To: bcrl; +Cc: jchapman, netdev
From: Benjamin LaHaise <bcrl@kvack.org>
Date: Tue, 10 Apr 2012 22:20:47 -0400
> 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>
This isn't right at all.
The return value of udpv6_queue_rcv_skb() ignorred at all
call sites except when it is invoked via ->backlog_rcv(), which
expects a different kind of return value, not an encap operation
indication.
So the whole "requeue as proto '-N'" logic isn't going to ever work.
You need to do what the ipv4 side does, split the routine into
two parts:
1) A __udpv6_queue_rcv_skb() which purely handles socket queueing
cases. It does not handle encap or anything like that.
This is what is what you hook into ->backlog_rcv for ipv6 udp.
2) A udpv6_queue_rcv_skb() which is invoked by the UDPv6 socket demux
on receive, and which will properly propagate the return values
back down into ipv6 input to do the "requeue as proto '-N'" stuff.
Please resubmit both of these patches once you've fixed this up (and
tested it).
^ permalink raw reply [flat|nested] 3+ messages in thread
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2012-04-11 2:20 [PATCH net-next 1/2] net/ipv6/udp: Add encap_rcv support to IPv6 UDP Benjamin LaHaise
2012-04-11 11:51 ` James Chapman
2012-04-13 17:24 ` David Miller
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