syzbot

xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets

======================================================
WARNING: possible circular locking dependency detected
4.15.0+ #288 Not tainted
------------------------------------------------------
syzkaller182353/4123 is trying to acquire lock:
 (rtnl_mutex){+.+.}, at: [<00000000b7215bae>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:72

but task is already holding lock:
 (&xt[i].mutex){+.+.}, at: [<000000006a6a9561>] xt_find_table_lock+0x40/0x3d0 net/netfilter/x_tables.c:1036

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (&xt[i].mutex){+.+.}:
       __mutex_lock_common kernel/locking/mutex.c:756 [inline]
       __mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893
       mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
       xt_find_target+0x44/0x1e0 net/netfilter/x_tables.c:229
       xt_request_find_target+0x2c/0xb0 net/netfilter/x_tables.c:255
       find_check_entry.isra.7+0x669/0xcf0 net/ipv6/netfilter/ip6_tables.c:567
       translate_table+0xf52/0x1690 net/ipv6/netfilter/ip6_tables.c:744
       do_replace net/ipv6/netfilter/ip6_tables.c:1162 [inline]
       do_ip6t_set_ctl+0x370/0x5f0 net/ipv6/netfilter/ip6_tables.c:1688
       nf_sockopt net/netfilter/nf_sockopt.c:106 [inline]
       nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:115
       ipv6_setsockopt+0x115/0x150 net/ipv6/ipv6_sockglue.c:928
       udpv6_setsockopt+0x45/0x80 net/ipv6/udp.c:1452
       sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2968
       SYSC_setsockopt net/socket.c:1831 [inline]
       SyS_setsockopt+0x189/0x360 net/socket.c:1810
       entry_SYSCALL_64_fastpath+0x29/0xa0

-> #1 (sk_lock-AF_INET6){+.+.}:
       lock_sock_nested+0xc2/0x110 net/core/sock.c:2770
       lock_sock include/net/sock.h:1459 [inline]
       do_ipv6_setsockopt.isra.8+0x3c5/0x39d0 net/ipv6/ipv6_sockglue.c:167
       ipv6_setsockopt+0xd7/0x150 net/ipv6/ipv6_sockglue.c:922
       tcp_setsockopt+0x82/0xd0 net/ipv4/tcp.c:2875
       sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2968
       SYSC_setsockopt net/socket.c:1831 [inline]
       SyS_setsockopt+0x189/0x360 net/socket.c:1810
       entry_SYSCALL_64_fastpath+0x29/0xa0

-> #0 (rtnl_mutex){+.+.}:
       lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3920
       __mutex_lock_common kernel/locking/mutex.c:756 [inline]
       __mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893
       mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
       rtnl_lock+0x17/0x20 net/core/rtnetlink.c:72
       unregister_netdevice_notifier+0x91/0x4e0 net/core/dev.c:1656
       tee_tg_destroy+0x61/0xc0 net/netfilter/xt_TEE.c:123
       cleanup_entry+0x218/0x350 net/ipv4/netfilter/ip_tables.c:654
       __do_replace+0x7d7/0xa90 net/ipv4/netfilter/ip_tables.c:1091
       do_replace net/ipv4/netfilter/ip_tables.c:1147 [inline]
       do_ipt_set_ctl+0x40f/0x5f0 net/ipv4/netfilter/ip_tables.c:1677
       nf_sockopt net/netfilter/nf_sockopt.c:106 [inline]
       nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:115
       ip_setsockopt+0xa1/0xb0 net/ipv4/ip_sockglue.c:1256
       sctp_setsockopt+0x2a0/0x5de0 net/sctp/socket.c:4074
       sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2968
       SYSC_setsockopt net/socket.c:1831 [inline]
       SyS_setsockopt+0x189/0x360 net/socket.c:1810
       entry_SYSCALL_64_fastpath+0x29/0xa0

other info that might help us debug this:

Chain exists of:
  rtnl_mutex --> sk_lock-AF_INET6 --> &xt[i].mutex

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&xt[i].mutex);
                               lock(sk_lock-AF_INET6);
                               lock(&xt[i].mutex);
  lock(rtnl_mutex);

 *** DEADLOCK ***

2 locks held by syzkaller182353/4123:
 #0:  (sk_lock-AF_INET){+.+.}, at: [<00000000c87e41d3>] lock_sock include/net/sock.h:1459 [inline]
 #0:  (sk_lock-AF_INET){+.+.}, at: [<00000000c87e41d3>] ip_setsockopt+0x8c/0xb0 net/ipv4/ip_sockglue.c:1255
 #1:  (&xt[i].mutex){+.+.}, at: [<000000006a6a9561>] xt_find_table_lock+0x40/0x3d0 net/netfilter/x_tables.c:1036

stack backtrace:
CPU: 0 PID: 4123 Comm: syzkaller182353 Not tainted 4.15.0+ #288
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:53
 print_circular_bug.isra.38+0x2cd/0x2dc kernel/locking/lockdep.c:1223
 check_prev_add kernel/locking/lockdep.c:1863 [inline]
 check_prevs_add kernel/locking/lockdep.c:1976 [inline]
 validate_chain kernel/locking/lockdep.c:2417 [inline]
 __lock_acquire+0x30a8/0x3e00 kernel/locking/lockdep.c:3431
 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3920
 __mutex_lock_common kernel/locking/mutex.c:756 [inline]
 __mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
 rtnl_lock+0x17/0x20 net/core/rtnetlink.c:72
 unregister_netdevice_notifier+0x91/0x4e0 net/core/dev.c:1656
 tee_tg_destroy+0x61/0xc0 net/netfilter/xt_TEE.c:123
 cleanup_entry+0x218/0x350 net/ipv4/netfilter/ip_tables.c:654
 __do_replace+0x7d7/0xa90 net/ipv4/netfilter/ip_tables.c:1091
 do_replace net/ipv4/netfilter/ip_tables.c:1147 [inline]
 do_ipt_set_ctl+0x40f/0x5f0 net/ipv4/netfilter/ip_tables.c:1677
 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline]
 nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:115
 ip_setsockopt+0xa1/0xb0 net/ipv4/ip_sockglue.c:1256
 sctp_setsockopt+0x2a0/0x5de0 net/sctp/socket.c:4074
 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2968
 SYSC_setsockopt net/socket.c:1831 [inline]
 SyS_setsockopt+0x189/0x360 net/socket.c:1810
 entry_SYSCALL_64_fastpath+0x29/0xa0
RIP: 0033:0x442009
RSP: 002b:00007ffff758cfc8 EFLAGS: 00000207 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 0000000000442009
RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000007
RBP: 31affa775212f497 R08: 0000000000000308 R09: 0000000000000000
R10: 000000002002ccf8 R11: 0000000000000207 R12: f3023f5f5df3bc21
R13: f6fcce9cd855ec40 R14: fbfe5b6031634428 R15: 0000000000000000
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets
xt_TCPMSS: Only works on TCP SYN packets