inet: fix lwtunnel_valid_encap_type() lock imbalance

inet: fix lwtunnel_valid_encap_type() lock imbalance

After blamed commit rtm_to_fib_config() now calls
lwtunnel_valid_encap_type{_attr}() without RTNL held,
triggering an unlock balance in __rtnl_unlock,
as reported by syzbot [1]

IPv6 and rtm_to_nh_config() are not yet converted.

Add a temporary @rtnl_is_held parameter to lwtunnel_valid_encap_type()
and lwtunnel_valid_encap_type_attr().

While we are at it replace the two rcu_dereference()
in lwtunnel_valid_encap_type() with more appropriate
rcu_access_pointer().

[1]
syz-executor245/5836 is trying to release lock (rtnl_mutex) at:
 [<ffffffff89d0e38c>] __rtnl_unlock+0x6c/0xf0 net/core/rtnetlink.c:142
but there are no more locks to release!

other info that might help us debug this:
no locks held by syz-executor245/5836.

stack backtrace:
CPU: 0 UID: 0 PID: 5836 Comm: syz-executor245 Not tainted 6.14.0-rc4-syzkaller-00873-g3424291dd242 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <TASK>
  __dump_stack lib/dump_stack.c:94 [inline]
  dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
  print_unlock_imbalance_bug+0x25b/0x2d0 kernel/locking/lockdep.c:5289
  __lock_release kernel/locking/lockdep.c:5518 [inline]
  lock_release+0x47e/0xa30 kernel/locking/lockdep.c:5872
  __mutex_unlock_slowpath+0xec/0x800 kernel/locking/mutex.c:891
  __rtnl_unlock+0x6c/0xf0 net/core/rtnetlink.c:142
  lwtunnel_valid_encap_type+0x38a/0x5f0 net/core/lwtunnel.c:169
  lwtunnel_valid_encap_type_attr+0x113/0x270 net/core/lwtunnel.c:209
  rtm_to_fib_config+0x949/0x14e0 net/ipv4/fib_frontend.c:808
  inet_rtm_newroute+0xf6/0x2a0 net/ipv4/fib_frontend.c:917
  rtnetlink_rcv_msg+0x791/0xcf0 net/core/rtnetlink.c:6919
  netlink_rcv_skb+0x206/0x480 net/netlink/af_netlink.c:2534
  netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
  netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1339
  netlink_sendmsg+0x8de/0xcb0 net/netlink/af_netlink.c:1883
  sock_sendmsg_nosec net/socket.c:709 [inline]

Fixes: 1dd2af7963e9 ("ipv4: fib: Convert RTM_NEWROUTE and RTM_DELROUTE to per-netns RTNL.")
Reported-by: syzbot+3f18ef0f7df107a3f6a0@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/netdev/67c6f87a.050a0220.38b91b.0147.GAE@google.com/T/#u
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Link: https://patch.msgid.link/20250304125918.2763514-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>