mptcp: fix length of ADD_ADDR with port sub-option

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>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
index 91827d9..e21a5bc 100644 (file)
--- 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;
 }