net/ipv6/inet6_connection_sock.c

Source file repositories/reference/linux-study-clean/net/ipv6/inet6_connection_sock.c

File Facts

System: Linux kernel
Corpus path: net/ipv6/inet6_connection_sock.c
Extension: .c
Size: 3582 bytes
Lines: 127
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.

Networking stack implementation surface: socket APIs, protocol dispatch, packet flow, routing, filtering, and network namespaces.
Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.
Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

linux/module.h
linux/in6.h
linux/ipv6.h
linux/jhash.h
linux/slab.h
net/addrconf.h
net/inet_connection_sock.h
net/inet_ecn.h
net/inet_hashtables.h
net/ip6_route.h
net/sock.h
net/inet6_connection_sock.h
net/sock_reuseport.h

Detected Declarations

function inet6_csk_xmit
export inet6_csk_xmit

Annotated Snippet

if (IS_ERR(dst)) {
			WRITE_ONCE(sk->sk_err_soft, -PTR_ERR(dst));
			sk->sk_route_caps = 0;
			sk_skb_reason_drop(sk, skb,
					   SKB_DROP_REASON_IP_OUTNOROUTES);
			return PTR_ERR(dst);
		}
		/* Restore final destination back after routing done */
		fl6->daddr = sk->sk_v6_daddr;
	}

	rcu_read_lock();
	skb_dst_set_noref(skb, dst);

	res = ip6_xmit(sk, skb, fl6, sk->sk_mark, rcu_dereference(np->opt),
		       np->tclass, READ_ONCE(sk->sk_priority));
	rcu_read_unlock();
	return res;
}
EXPORT_SYMBOL_GPL(inet6_csk_xmit);

Annotation

Immediate include surface: `linux/module.h`, `linux/in6.h`, `linux/ipv6.h`, `linux/jhash.h`, `linux/slab.h`, `net/addrconf.h`, `net/inet_connection_sock.h`, `net/inet_ecn.h`.
Detected declarations: `function inet6_csk_xmit`, `export inet6_csk_xmit`.
Atlas domain: Networking Core / Sockets, Protocols, Packet Path, And Network Policy.
Implementation status: integration implementation candidate.
Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.

Implementation Notes

This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.