net/ipv6/datagram.c

Source file repositories/reference/linux-study-clean/net/ipv6/datagram.c

File Facts

System
Linux kernel
Corpus path
net/ipv6/datagram.c
Extension
.c
Size
27001 bytes
Lines
1121
Domain
Networking Core
Bucket
Sockets, Protocols, Packet Path, And Network Policy
Inferred role
Networking Core: exported/initcall integration point
Status
integration 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

if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
			sk->sk_v6_rcv_saddr = fl6->saddr;
			inet->inet_rcv_saddr = LOOPBACK4_IPV6;
			if (sk->sk_prot->rehash)
				sk->sk_prot->rehash(sk);
		}
	}

	ip6_sk_dst_store_flow(sk, dst, fl6);

out:
	fl6_sock_release(flowlabel);
	return err;
}

void ip6_datagram_release_cb(struct sock *sk)
{
	struct dst_entry *dst;

	if (ipv6_addr_v4mapped(&sk->sk_v6_daddr))
		return;

	rcu_read_lock();
	dst = __sk_dst_get(sk);
	if (!dst || !READ_ONCE(dst->obsolete) ||
	    dst->ops->check(dst, inet6_sk(sk)->dst_cookie)) {
		rcu_read_unlock();
		return;
	}
	rcu_read_unlock();

	ip6_datagram_dst_update(sk, false);
}
EXPORT_SYMBOL_GPL(ip6_datagram_release_cb);

int __ip6_datagram_connect(struct sock *sk, struct sockaddr_unsized *uaddr,
			   int addr_len)
{
	struct sockaddr_in6	*usin = (struct sockaddr_in6 *) uaddr;
	struct inet_sock	*inet = inet_sk(sk);
	struct ipv6_pinfo	*np = inet6_sk(sk);
	struct in6_addr		*daddr, old_daddr;
	__be32			fl6_flowlabel = 0;
	__be32			old_fl6_flowlabel;
	__be16			old_dport;
	int			addr_type;
	int			err;

	if (usin->sin6_family == AF_INET) {
		if (ipv6_only_sock(sk))
			return -EAFNOSUPPORT;
		err = __ip4_datagram_connect(sk, uaddr, addr_len);
		goto ipv4_connected;
	}

	if (addr_len < SIN6_LEN_RFC2133)
		return -EINVAL;

	if (usin->sin6_family != AF_INET6)
		return -EAFNOSUPPORT;

	if (inet6_test_bit(SNDFLOW, sk))
		fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;

	if (ipv6_addr_any(&usin->sin6_addr)) {
		/*
		 *	connect to self
		 */
		if (ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr))
			ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK),
					       &usin->sin6_addr);
		else
			usin->sin6_addr = in6addr_loopback;
	}

	addr_type = ipv6_addr_type(&usin->sin6_addr);

	daddr = &usin->sin6_addr;

	if (addr_type & IPV6_ADDR_MAPPED) {
		struct sockaddr_in sin;

		if (ipv6_only_sock(sk)) {
			err = -ENETUNREACH;
			goto out;
		}
		sin.sin_family = AF_INET;
		sin.sin_addr.s_addr = daddr->s6_addr32[3];
		sin.sin_port = usin->sin6_port;

Annotation

Implementation Notes