net/core/sock.c

2275  *	Caller must unlock socket even in error path (bh_unlock_sock(newsk))
2282 	struct sock *newsk;
2284 	newsk = sk_prot_alloc(prot, priority, sk->sk_family);
2285 	if (!newsk)
2288 	sock_copy(newsk, sk);
2290 	newsk->sk_prot_creator = prot;
2293 	if (likely(newsk->sk_net_refcnt)) {
2294 		get_net_track(sock_net(newsk), &newsk->ns_tracker, priority);
2295 		sock_inuse_add(sock_net(newsk), 1);
2302 		__netns_tracker_alloc(sock_net(newsk), &newsk->ns_tracker,
2305 	sk_node_init(&newsk->sk_node);
2306 	sock_lock_init(newsk);
2307 	bh_lock_sock(newsk);
2308 	newsk->sk_backlog.head	= newsk->sk_backlog.tail = NULL;
2309 	newsk->sk_backlog.len = 0;
2311 	atomic_set(&newsk->sk_rmem_alloc, 0);
2314 	refcount_set(&newsk->sk_wmem_alloc, 1);
2316 	atomic_set(&newsk->sk_omem_alloc, 0);
2317 	sk_init_common(newsk);
2319 	newsk->sk_dst_cache	= NULL;
2320 	newsk->sk_dst_pending_confirm = 0;
2321 	newsk->sk_wmem_queued	= 0;
2322 	newsk->sk_forward_alloc = 0;
2323 	newsk->sk_reserved_mem  = 0;
2324 	atomic_set(&newsk->sk_drops, 0);
2325 	newsk->sk_send_head	= NULL;
2326 	newsk->sk_userlocks	= sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
2327 	atomic_set(&newsk->sk_zckey, 0);
2329 	sock_reset_flag(newsk, SOCK_DONE);
2332 	newsk->sk_memcg = NULL;
2334 	cgroup_sk_clone(&newsk->sk_cgrp_data);
2343 		is_charged = sk_filter_charge(newsk, filter);
2344 	RCU_INIT_POINTER(newsk->sk_filter, filter);
2347 	if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) {
2353 			RCU_INIT_POINTER(newsk->sk_filter, NULL);
2354 		sk_free_unlock_clone(newsk);
2355 		newsk = NULL;
2358 	RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL);
2360 	if (bpf_sk_storage_clone(sk, newsk)) {
2361 		sk_free_unlock_clone(newsk);
2362 		newsk = NULL;
2369 	if (sk_user_data_is_nocopy(newsk))
2370 		newsk->sk_user_data = NULL;
2372 	newsk->sk_err	   = 0;
2373 	newsk->sk_err_soft = 0;
2374 	newsk->sk_priority = 0;
2375 	newsk->sk_incoming_cpu = raw_smp_processor_id();
2381 	refcount_set(&newsk->sk_refcnt, 2);
2383 	sk_set_socket(newsk, NULL);
2384 	sk_tx_queue_clear(newsk);
2385 	RCU_INIT_POINTER(newsk->sk_wq, NULL);
2387 	if (newsk->sk_prot->sockets_allocated)
2388 		sk_sockets_allocated_inc(newsk);
2390 	if (sock_needs_netstamp(sk) && newsk->sk_flags & SK_FLAGS_TIMESTAMP)
2393 	return newsk;