net/nfc/llcp_sock.c

Source file repositories/reference/linux-study-clean/net/nfc/llcp_sock.c

File Facts

System
Linux kernel
Corpus path
net/nfc/llcp_sock.c
Extension
.c
Size
22971 bytes
Lines
1069
Domain
Networking Core
Bucket
Sockets, Protocols, Packet Path, And Network Policy
Inferred role
Networking Core: operation-table or driver-model contract
Status
pattern implementation candidate

Why This File Exists

Networking stack implementation surface: socket APIs, protocol dispatch, packet flow, routing, filtering, and network namespaces.

Dependency Surface

Detected Declarations

Annotated Snippet

static const struct proto_ops llcp_sock_ops = {
	.family         = PF_NFC,
	.owner          = THIS_MODULE,
	.bind           = llcp_sock_bind,
	.connect        = llcp_sock_connect,
	.release        = llcp_sock_release,
	.socketpair     = sock_no_socketpair,
	.accept         = llcp_sock_accept,
	.getname        = llcp_sock_getname,
	.poll           = llcp_sock_poll,
	.ioctl          = sock_no_ioctl,
	.listen         = llcp_sock_listen,
	.shutdown       = sock_no_shutdown,
	.setsockopt     = nfc_llcp_setsockopt,
	.getsockopt     = nfc_llcp_getsockopt,
	.sendmsg        = llcp_sock_sendmsg,
	.recvmsg        = llcp_sock_recvmsg,
	.mmap           = sock_no_mmap,
};

static const struct proto_ops llcp_rawsock_ops = {
	.family         = PF_NFC,
	.owner          = THIS_MODULE,
	.bind           = llcp_raw_sock_bind,
	.connect        = sock_no_connect,
	.release        = llcp_sock_release,
	.socketpair     = sock_no_socketpair,
	.accept         = sock_no_accept,
	.getname        = llcp_sock_getname,
	.poll           = llcp_sock_poll,
	.ioctl          = sock_no_ioctl,
	.listen         = sock_no_listen,
	.shutdown       = sock_no_shutdown,
	.sendmsg        = sock_no_sendmsg,
	.recvmsg        = llcp_sock_recvmsg,
	.mmap           = sock_no_mmap,
};

static void llcp_sock_destruct(struct sock *sk)
{
	struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);

	pr_debug("%p\n", sk);

	if (sk->sk_state == LLCP_CONNECTED)
		nfc_put_device(llcp_sock->dev);

	skb_queue_purge(&sk->sk_receive_queue);

	nfc_llcp_sock_free(llcp_sock);

	if (!sock_flag(sk, SOCK_DEAD)) {
		pr_err("Freeing alive NFC LLCP socket %p\n", sk);
		return;
	}
}

struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp, int kern)
{
	struct sock *sk;
	struct nfc_llcp_sock *llcp_sock;

	sk = sk_alloc(&init_net, PF_NFC, gfp, &llcp_sock_proto, kern);
	if (!sk)
		return NULL;

	llcp_sock = nfc_llcp_sock(sk);

	sock_init_data(sock, sk);
	sk->sk_state = LLCP_CLOSED;
	sk->sk_protocol = NFC_SOCKPROTO_LLCP;
	sk->sk_type = type;
	sk->sk_destruct = llcp_sock_destruct;

	llcp_sock->ssap = 0;
	llcp_sock->dsap = LLCP_SAP_SDP;
	llcp_sock->rw = LLCP_MAX_RW + 1;
	llcp_sock->miux = cpu_to_be16(LLCP_MAX_MIUX + 1);
	llcp_sock->send_n = llcp_sock->send_ack_n = 0;
	llcp_sock->recv_n = llcp_sock->recv_ack_n = 0;
	llcp_sock->remote_ready = 1;
	llcp_sock->reserved_ssap = LLCP_SAP_MAX;
	nfc_llcp_socket_remote_param_init(llcp_sock);
	skb_queue_head_init(&llcp_sock->tx_queue);
	skb_queue_head_init(&llcp_sock->tx_pending_queue);
	INIT_LIST_HEAD(&llcp_sock->accept_queue);

	if (sock != NULL)
		sock->state = SS_UNCONNECTED;

Annotation

Implementation Notes