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From: Xin Long <lucien.xin@gmail.com>
To: network dev <netdev@vger.kernel.org>, linux-sctp@vger.kernel.org
Cc: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>,
	Neil Horman <nhorman@tuxdriver.com>,
	Michael Tuexen <tuexen@fh-muenster.de>,
	davem@davemloft.net, Jakub Kicinski <kuba@kernel.org>,
	gnault@redhat.com, pabeni@redhat.com,
	willemdebruijn.kernel@gmail.com
Subject: [PATCHv5 net-next 02/16] udp6: move the mss check after udp gso tunnel processing
Date: Thu, 29 Oct 2020 15:04:56 +0800	[thread overview]
Message-ID: <4f439ed717442a649ba78dc0efc6f121208a9995.1603955040.git.lucien.xin@gmail.com> (raw)
In-Reply-To: <48053c3bf48a46899bc0130dc43adca1e6925581.1603955040.git.lucien.xin@gmail.com>
In-Reply-To: <cover.1603955040.git.lucien.xin@gmail.com>

For some protocol's gso, like SCTP, it's using GSO_BY_FRAGS for
gso_size. When using UDP to encapsulate its packet, it will
return error in udp6_ufo_fragment() as skb->len < gso_size,
and it will never go to the gso tunnel processing.

So we should move this check after udp gso tunnel processing,
the same as udp4_ufo_fragment() does.

v1->v2:
  - no change.
v2->v3:
  - not do any cleanup.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
---
 net/ipv6/udp_offload.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/net/ipv6/udp_offload.c b/net/ipv6/udp_offload.c
index 584157a..aa602af 100644
--- a/net/ipv6/udp_offload.c
+++ b/net/ipv6/udp_offload.c
@@ -28,10 +28,6 @@ static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb,
 	int tnl_hlen;
 	int err;
 
-	mss = skb_shinfo(skb)->gso_size;
-	if (unlikely(skb->len <= mss))
-		goto out;
-
 	if (skb->encapsulation && skb_shinfo(skb)->gso_type &
 	    (SKB_GSO_UDP_TUNNEL|SKB_GSO_UDP_TUNNEL_CSUM))
 		segs = skb_udp_tunnel_segment(skb, features, true);
@@ -48,6 +44,10 @@ static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb,
 		if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4)
 			return __udp_gso_segment(skb, features);
 
+		mss = skb_shinfo(skb)->gso_size;
+		if (unlikely(skb->len <= mss))
+			goto out;
+
 		/* Do software UFO. Complete and fill in the UDP checksum as HW cannot
 		 * do checksum of UDP packets sent as multiple IP fragments.
 		 */
-- 
2.1.0


  reply	other threads:[~2020-10-29  7:21 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-29  7:04 [PATCHv5 net-next 00/16] sctp: Implement RFC6951: UDP Encapsulation of SCTP Xin Long
2020-10-29  7:04 ` [PATCHv5 net-next 01/16] udp: check udp sock encap_type in __udp_lib_err Xin Long
2020-10-29  7:04   ` Xin Long [this message]
2020-10-29  7:04     ` [PATCHv5 net-next 03/16] udp: support sctp over udp in skb_udp_tunnel_segment Xin Long
2020-10-29  7:04       ` [PATCHv5 net-next 04/16] sctp: create udp4 sock and add its encap_rcv Xin Long
2020-10-29  7:04         ` [PATCHv5 net-next 05/16] sctp: create udp6 sock and set " Xin Long
2020-10-29  7:05           ` [PATCHv5 net-next 06/16] sctp: add encap_err_lookup for udp encap socks Xin Long
2020-10-29  7:05             ` [PATCHv5 net-next 07/16] sctp: add encap_port for netns sock asoc and transport Xin Long
2020-10-29  7:05               ` [PATCHv5 net-next 08/16] sctp: add SCTP_REMOTE_UDP_ENCAPS_PORT sockopt Xin Long
2020-10-29  7:05                 ` [PATCHv5 net-next 09/16] sctp: allow changing transport encap_port by peer packets Xin Long
2020-10-29  7:05                   ` [PATCHv5 net-next 10/16] sctp: add udphdr to overhead when udp_port is set Xin Long
2020-10-29  7:05                     ` [PATCHv5 net-next 11/16] sctp: call sk_setup_caps in sctp_packet_transmit instead Xin Long
2020-10-29  7:05                       ` [PATCHv5 net-next 12/16] sctp: support for sending packet over udp4 sock Xin Long
2020-10-29  7:05                         ` [PATCHv5 net-next 13/16] sctp: support for sending packet over udp6 sock Xin Long
2020-10-29  7:05                           ` [PATCHv5 net-next 14/16] sctp: add the error cause for new encapsulation port restart Xin Long
2020-10-29  7:05                             ` [PATCHv5 net-next 15/16] sctp: handle the init chunk matching an existing asoc Xin Long
2020-10-29  7:05                               ` [PATCHv5 net-next 16/16] sctp: enable udp tunneling socks Xin Long
2020-10-29 21:55 ` [PATCHv5 net-next 00/16] sctp: Implement RFC6951: UDP Encapsulation of SCTP Marcelo Ricardo Leitner
2020-10-30 23:46 ` Jakub Kicinski

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