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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, gnault@redhat.com, pabeni@redhat.com,
	willemdebruijn.kernel@gmail.com
Subject: [PATCHv3 net-next 01/16] udp: check udp sock encap_type in __udp_lib_err
Date: Tue, 13 Oct 2020 15:27:26 +0800	[thread overview]
Message-ID: <fae9c57767447c4fd97476807b9e029e8fda607a.1602574012.git.lucien.xin@gmail.com> (raw)
Message-ID: <20201013072726.IYJihYkVgE0aPJFMrCTu_fB3DT6uGFB1zyG_cs8XPZM@z> (raw)
In-Reply-To: <cover.1602574012.git.lucien.xin@gmail.com>
In-Reply-To: <cover.1602574012.git.lucien.xin@gmail.com>

There is a chance that __udp4/6_lib_lookup() returns a udp encap
sock in __udp_lib_err(), like the udp encap listening sock may
use the same port as remote encap port, in which case it should
go to __udp4/6_lib_err_encap() for more validation before
processing the icmp packet.

This patch is to check encap_type in __udp_lib_err() for the
further validation for a encap sock.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
---
 net/ipv4/udp.c | 2 +-
 net/ipv6/udp.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 09f0a23..ca04a8a 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -702,7 +702,7 @@ int __udp4_lib_err(struct sk_buff *skb, u32 info, struct udp_table *udptable)
 	sk = __udp4_lib_lookup(net, iph->daddr, uh->dest,
 			       iph->saddr, uh->source, skb->dev->ifindex,
 			       inet_sdif(skb), udptable, NULL);
-	if (!sk) {
+	if (!sk || udp_sk(sk)->encap_type) {
 		/* No socket for error: try tunnels before discarding */
 		sk = ERR_PTR(-ENOENT);
 		if (static_branch_unlikely(&udp_encap_needed_key)) {
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 29d9691..cde9b88 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -560,7 +560,7 @@ int __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 
 	sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source,
 			       inet6_iif(skb), inet6_sdif(skb), udptable, NULL);
-	if (!sk) {
+	if (!sk || udp_sk(sk)->encap_type) {
 		/* No socket for error: try tunnels before discarding */
 		sk = ERR_PTR(-ENOENT);
 		if (static_branch_unlikely(&udpv6_encap_needed_key)) {
-- 
2.1.0


  parent reply	other threads:[~2020-10-13  7:28 UTC|newest]

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-13  7:27 [PATCHv3 net-next 00/16] sctp: Implement RFC6951: UDP Encapsulation of SCTP Xin Long
2020-10-13  7:27 ` Xin Long
2020-10-13  7:27 ` Xin Long [this message]
2020-10-13  7:27   ` [PATCHv3 net-next 01/16] udp: check udp sock encap_type in __udp_lib_err Xin Long
2020-10-13  7:27   ` [PATCHv3 net-next 02/16] udp6: move the mss check after udp gso tunnel processing Xin Long
2020-10-13  7:27     ` Xin Long
2020-10-13  7:27     ` [PATCHv3 net-next 03/16] udp: support sctp over udp in skb_udp_tunnel_segment Xin Long
2020-10-13  7:27       ` Xin Long
2020-10-13  7:27       ` [PATCHv3 net-next 04/16] sctp: create udp4 sock and add its encap_rcv Xin Long
2020-10-13  7:27         ` Xin Long
2020-10-13  7:27         ` [PATCHv3 net-next 05/16] sctp: create udp6 sock and set " Xin Long
2020-10-13  7:27           ` Xin Long
2020-10-13  7:27           ` [PATCHv3 net-next 06/16] sctp: add encap_err_lookup for udp encap socks Xin Long
2020-10-13  7:27             ` Xin Long
2020-10-13  7:27             ` [PATCHv3 net-next 07/16] sctp: add encap_port for netns sock asoc and transport Xin Long
2020-10-13  7:27               ` Xin Long
2020-10-13  7:27               ` [PATCHv3 net-next 08/16] sctp: add SCTP_REMOTE_UDP_ENCAPS_PORT sockopt Xin Long
2020-10-13  7:27                 ` Xin Long
2020-10-13  7:27                 ` [PATCHv3 net-next 09/16] sctp: allow changing transport encap_port by peer packets Xin Long
2020-10-13  7:27                   ` Xin Long
2020-10-13  7:27                   ` [PATCHv3 net-next 10/16] sctp: add udphdr to overhead when udp_port is set Xin Long
2020-10-13  7:27                     ` Xin Long
2020-10-13  7:27                     ` [PATCHv3 net-next 11/16] sctp: call sk_setup_caps in sctp_packet_transmit instead Xin Long
2020-10-13  7:27                       ` Xin Long
2020-10-13  7:27                       ` [PATCHv3 net-next 12/16] sctp: support for sending packet over udp4 sock Xin Long
2020-10-13  7:27                         ` Xin Long
2020-10-13  7:27                         ` [PATCHv3 net-next 13/16] sctp: support for sending packet over udp6 sock Xin Long
2020-10-13  7:27                           ` Xin Long
2020-10-13  7:27                           ` [PATCHv3 net-next 14/16] sctp: add the error cause for new encapsulation port restart Xin Long
2020-10-13  7:27                             ` Xin Long
2020-10-13  7:27                             ` [PATCHv3 net-next 15/16] sctp: handle the init chunk matching an existing asoc Xin Long
2020-10-13  7:27                               ` Xin Long
2020-10-13  7:27                               ` [PATCHv3 net-next 16/16] sctp: enable udp tunneling socks Xin Long
2020-10-13  7:27                                 ` Xin Long
2020-10-15 17:42                                 ` Marcelo Ricardo Leitner
2020-10-15 17:42                                   ` Marcelo Ricardo Leitner
2020-10-15 21:23                                   ` David Laight
2020-10-15 21:35                                     ` Michael Tuexen
2020-10-15 21:35                                       ` Michael Tuexen
2020-10-16  7:08                                   ` Xin Long
2020-10-16  7:08                                     ` Xin Long
2020-10-19 10:40                                     ` Xin Long
2020-10-19 10:40                                       ` Xin Long
2020-10-13 17:19     ` [PATCHv3 net-next 02/16] udp6: move the mss check after udp gso tunnel processing Willem de Bruijn
2020-10-13 17:19       ` Willem de Bruijn
2020-10-15  3:34 ` [PATCHv3 net-next 00/16] sctp: Implement RFC6951: UDP Encapsulation of SCTP Jakub Kicinski
2020-10-15  3:34   ` Jakub Kicinski
2020-10-15 12:41   ` Marcelo Ricardo Leitner
2020-10-15 12:41     ` Marcelo Ricardo Leitner

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