bpf: Add sk_is_inet and IS_ICSK check in tls_sw_has_ctx_tx/rx

bpf: Add sk_is_inet and IS_ICSK check in tls_sw_has_ctx_tx/rx

As the introduction of the support for vsock and unix sockets in sockmap,
tls_sw_has_ctx_tx/rx cannot presume the socket passed in must be IS_ICSK.
vsock and af_unix sockets have vsock_sock and unix_sock instead of
inet_connection_sock. For these sockets, tls_get_ctx may return an invalid
pointer and cause page fault in function tls_sw_ctx_rx.

BUG: unable to handle page fault for address: 0000000000040030
Workqueue: vsock-loopback vsock_loopback_work
RIP: 0010:sk_psock_strp_data_ready+0x23/0x60
Call Trace:
 ? __die+0x81/0xc3
 ? no_context+0x194/0x350
 ? do_page_fault+0x30/0x110
 ? async_page_fault+0x3e/0x50
 ? sk_psock_strp_data_ready+0x23/0x60
 virtio_transport_recv_pkt+0x750/0x800
 ? update_load_avg+0x7e/0x620
 vsock_loopback_work+0xd0/0x100
 process_one_work+0x1a7/0x360
 worker_thread+0x30/0x390
 ? create_worker+0x1a0/0x1a0
 kthread+0x112/0x130
 ? __kthread_cancel_work+0x40/0x40
 ret_from_fork+0x1f/0x40

v2:
  - Add IS_ICSK check
v3:
  - Update the commits in Fixes

Fixes: 634f1a7110b4 ("vsock: support sockmap")
Fixes: 94531cfcbe79 ("af_unix: Add unix_stream_proto for sockmap")
Signed-off-by: Zijian Zhang <[email protected]>
Acked-by: Stanislav Fomichev <[email protected]>
Acked-by: Jakub Kicinski <[email protected]>
Reviewed-by: Cong Wang <[email protected]>
Acked-by: Stefano Garzarella <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Martin KaFai Lau <[email protected]>