* [MPTCP] [PATCH net] mptcp: fix length of ADD_ADDR with port sub-option
@ 2021-03-08 9:00 ` Davide Caratti
0 siblings, 0 replies; 3+ messages in thread
From: Davide Caratti @ 2021-03-08 9:00 UTC (permalink / raw)
To: mptcp
[-- Attachment #1: Type: text/plain, Size: 3208 bytes --]
in current Linux, MPTCP peers advertising endpoints with port numbers use
a sub-option length that wrongly accounts for the trailing TCP NOP. Also,
receivers will only process incoming ADD_ADDR with port having such wrong
sub-option length. Fix this, making ADD_ADDR compliant to RFC8684 §3.4.1.
this can be verified running tcpdump on the kselftests artifacts:
unpatched kernel:
[root(a)bottarga mptcp]# tcpdump -tnnr unpatched.pcap | grep add-addr
reading from file unpatched.pcap, link-type LINUX_SLL (Linux cooked v1), snapshot length 65535
IP 10.0.1.1.10000 > 10.0.1.2.53078: Flags [.], ack 101, win 509, options [nop,nop,TS val 214459678 ecr 521312851,mptcp add-addr v1 id 1 a00:201:2774:2d88:7436:85c3:17fd:101], length 0
IP 10.0.1.2.53078 > 10.0.1.1.10000: Flags [.], ack 101, win 502, options [nop,nop,TS val 521312852 ecr 214459678,mptcp add-addr[bad opt]]
patched kernel:
[root(a)bottarga mptcp]# tcpdump -tnnr patched.pcap | grep add-addr
reading from file patched.pcap, link-type LINUX_SLL (Linux cooked v1), snapshot length 65535
IP 10.0.1.1.10000 > 10.0.1.2.38178: Flags [.], ack 101, win 509, options [nop,nop,TS val 3728873902 ecr 2732713192,mptcp add-addr v1 id 1 10.0.2.1:10100 hmac 0xbccdfcbe59292a1f,nop,nop], length 0
IP 10.0.1.2.38178 > 10.0.1.1.10000: Flags [.], ack 101, win 502, options [nop,nop,TS val 2732713195 ecr 3728873902,mptcp add-addr v1-echo id 1 10.0.2.1:10100,nop,nop], length 0
Fixes: 22fb85ffaefb ("mptcp: add port support for ADD_ADDR suboption writing")
CC: stable(a)vger.kernel.org # 5.11+
Reviewed-by: Mat Martineau <mathew.j.martineau(a)linux.intel.com>
Acked-and-tested-by: Geliang Tang <geliangtang(a)gmail.com>
Signed-off-by: Davide Caratti <dcaratti(a)redhat.com>
---
net/mptcp/protocol.h | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)
diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
index 91827d949766..e21a5bc36cf0 100644
--- a/net/mptcp/protocol.h
+++ b/net/mptcp/protocol.h
@@ -52,14 +52,15 @@
#define TCPOLEN_MPTCP_DSS_MAP64 14
#define TCPOLEN_MPTCP_DSS_CHECKSUM 2
#define TCPOLEN_MPTCP_ADD_ADDR 16
-#define TCPOLEN_MPTCP_ADD_ADDR_PORT 20
+#define TCPOLEN_MPTCP_ADD_ADDR_PORT 18
#define TCPOLEN_MPTCP_ADD_ADDR_BASE 8
-#define TCPOLEN_MPTCP_ADD_ADDR_BASE_PORT 12
+#define TCPOLEN_MPTCP_ADD_ADDR_BASE_PORT 10
#define TCPOLEN_MPTCP_ADD_ADDR6 28
-#define TCPOLEN_MPTCP_ADD_ADDR6_PORT 32
+#define TCPOLEN_MPTCP_ADD_ADDR6_PORT 30
#define TCPOLEN_MPTCP_ADD_ADDR6_BASE 20
-#define TCPOLEN_MPTCP_ADD_ADDR6_BASE_PORT 24
-#define TCPOLEN_MPTCP_PORT_LEN 4
+#define TCPOLEN_MPTCP_ADD_ADDR6_BASE_PORT 22
+#define TCPOLEN_MPTCP_PORT_LEN 2
+#define TCPOLEN_MPTCP_PORT_ALIGN 2
#define TCPOLEN_MPTCP_RM_ADDR_BASE 4
#define TCPOLEN_MPTCP_PRIO 3
#define TCPOLEN_MPTCP_PRIO_ALIGN 4
@@ -701,8 +702,9 @@ static inline unsigned int mptcp_add_addr_len(int family, bool echo, bool port)
len = TCPOLEN_MPTCP_ADD_ADDR6_BASE;
if (!echo)
len += MPTCPOPT_THMAC_LEN;
+ /* account for 2 trailing 'nop' options */
if (port)
- len += TCPOLEN_MPTCP_PORT_LEN;
+ len += TCPOLEN_MPTCP_PORT_LEN + TCPOLEN_MPTCP_PORT_ALIGN;
return len;
}
--
2.29.2
^ permalink raw reply related [flat|nested] 3+ messages in thread* [PATCH net] mptcp: fix length of ADD_ADDR with port sub-option
@ 2021-03-08 9:00 ` Davide Caratti
0 siblings, 0 replies; 3+ messages in thread
From: Davide Caratti @ 2021-03-08 9:00 UTC (permalink / raw)
To: netdev, David S. Miller, Jakub Kicinski; +Cc: Matthieu Baerts, stable, mptcp
in current Linux, MPTCP peers advertising endpoints with port numbers use
a sub-option length that wrongly accounts for the trailing TCP NOP. Also,
receivers will only process incoming ADD_ADDR with port having such wrong
sub-option length. Fix this, making ADD_ADDR compliant to RFC8684 §3.4.1.
this can be verified running tcpdump on the kselftests artifacts:
unpatched kernel:
[root@bottarga mptcp]# tcpdump -tnnr unpatched.pcap | grep add-addr
reading from file unpatched.pcap, link-type LINUX_SLL (Linux cooked v1), snapshot length 65535
IP 10.0.1.1.10000 > 10.0.1.2.53078: Flags [.], ack 101, win 509, options [nop,nop,TS val 214459678 ecr 521312851,mptcp add-addr v1 id 1 a00:201:2774:2d88:7436:85c3:17fd:101], length 0
IP 10.0.1.2.53078 > 10.0.1.1.10000: Flags [.], ack 101, win 502, options [nop,nop,TS val 521312852 ecr 214459678,mptcp add-addr[bad opt]]
patched kernel:
[root@bottarga mptcp]# tcpdump -tnnr patched.pcap | grep add-addr
reading from file patched.pcap, link-type LINUX_SLL (Linux cooked v1), snapshot length 65535
IP 10.0.1.1.10000 > 10.0.1.2.38178: Flags [.], ack 101, win 509, options [nop,nop,TS val 3728873902 ecr 2732713192,mptcp add-addr v1 id 1 10.0.2.1:10100 hmac 0xbccdfcbe59292a1f,nop,nop], length 0
IP 10.0.1.2.38178 > 10.0.1.1.10000: Flags [.], ack 101, win 502, options [nop,nop,TS val 2732713195 ecr 3728873902,mptcp add-addr v1-echo id 1 10.0.2.1:10100,nop,nop], length 0
Fixes: 22fb85ffaefb ("mptcp: add port support for ADD_ADDR suboption writing")
CC: stable@vger.kernel.org # 5.11+
Reviewed-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Acked-and-tested-by: Geliang Tang <geliangtang@gmail.com>
Signed-off-by: Davide Caratti <dcaratti@redhat.com>
---
net/mptcp/protocol.h | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)
diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
index 91827d949766..e21a5bc36cf0 100644
--- a/net/mptcp/protocol.h
+++ b/net/mptcp/protocol.h
@@ -52,14 +52,15 @@
#define TCPOLEN_MPTCP_DSS_MAP64 14
#define TCPOLEN_MPTCP_DSS_CHECKSUM 2
#define TCPOLEN_MPTCP_ADD_ADDR 16
-#define TCPOLEN_MPTCP_ADD_ADDR_PORT 20
+#define TCPOLEN_MPTCP_ADD_ADDR_PORT 18
#define TCPOLEN_MPTCP_ADD_ADDR_BASE 8
-#define TCPOLEN_MPTCP_ADD_ADDR_BASE_PORT 12
+#define TCPOLEN_MPTCP_ADD_ADDR_BASE_PORT 10
#define TCPOLEN_MPTCP_ADD_ADDR6 28
-#define TCPOLEN_MPTCP_ADD_ADDR6_PORT 32
+#define TCPOLEN_MPTCP_ADD_ADDR6_PORT 30
#define TCPOLEN_MPTCP_ADD_ADDR6_BASE 20
-#define TCPOLEN_MPTCP_ADD_ADDR6_BASE_PORT 24
-#define TCPOLEN_MPTCP_PORT_LEN 4
+#define TCPOLEN_MPTCP_ADD_ADDR6_BASE_PORT 22
+#define TCPOLEN_MPTCP_PORT_LEN 2
+#define TCPOLEN_MPTCP_PORT_ALIGN 2
#define TCPOLEN_MPTCP_RM_ADDR_BASE 4
#define TCPOLEN_MPTCP_PRIO 3
#define TCPOLEN_MPTCP_PRIO_ALIGN 4
@@ -701,8 +702,9 @@ static inline unsigned int mptcp_add_addr_len(int family, bool echo, bool port)
len = TCPOLEN_MPTCP_ADD_ADDR6_BASE;
if (!echo)
len += MPTCPOPT_THMAC_LEN;
+ /* account for 2 trailing 'nop' options */
if (port)
- len += TCPOLEN_MPTCP_PORT_LEN;
+ len += TCPOLEN_MPTCP_PORT_LEN + TCPOLEN_MPTCP_PORT_ALIGN;
return len;
}
--
2.29.2
^ permalink raw reply related [flat|nested] 3+ messages in thread* Re: [PATCH net] mptcp: fix length of ADD_ADDR with port sub-option
2021-03-08 9:00 ` Davide Caratti
(?)
@ 2021-03-08 23:10 ` patchwork-bot+netdevbpf
-1 siblings, 0 replies; 3+ messages in thread
From: patchwork-bot+netdevbpf @ 2021-03-08 23:10 UTC (permalink / raw)
To: Davide Caratti; +Cc: netdev, davem, kuba, matthieu.baerts, stable, mptcp
Hello:
This patch was applied to netdev/net.git (refs/heads/master):
On Mon, 8 Mar 2021 10:00:04 +0100 you wrote:
> in current Linux, MPTCP peers advertising endpoints with port numbers use
> a sub-option length that wrongly accounts for the trailing TCP NOP. Also,
> receivers will only process incoming ADD_ADDR with port having such wrong
> sub-option length. Fix this, making ADD_ADDR compliant to RFC8684 §3.4.1.
>
> this can be verified running tcpdump on the kselftests artifacts:
>
> [...]
Here is the summary with links:
- [net] mptcp: fix length of ADD_ADDR with port sub-option
https://git.kernel.org/netdev/net/c/27ab92d9996e
You are awesome, thank you!
--
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html
^ permalink raw reply [flat|nested] 3+ messages in thread
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2021-03-08 9:00 [MPTCP] [PATCH net] mptcp: fix length of ADD_ADDR with port sub-option Davide Caratti
2021-03-08 9:00 ` Davide Caratti
2021-03-08 23:10 ` patchwork-bot+netdevbpf
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