net/can/af_can.h

File Facts

System

Linux kernel

Corpus path

net/can/af_can.h

Extension

.h

Size

3463 bytes

Lines

104

Domain

Networking Core

Bucket

Sockets, Protocols, Packet Path, And Network Policy

Inferred role

Networking Core: implementation source

Status

source 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.
• 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/skbuff.h
• linux/netdevice.h
• linux/list.h
• linux/rcupdate.h
• linux/can.h

Detected Declarations

• struct receiver
• struct can_pkg_stats
• struct can_rcv_lists_stats

Annotated Snippet

struct receiver {
	struct hlist_node list;
	canid_t can_id;
	canid_t mask;
	atomic_long_t matches;
	void (*func)(struct sk_buff *skb, void *data);
	void *data;
	char *ident;
	struct sock *sk;
	struct rcu_head rcu;
};

/* statistic structures */

/* can be reset e.g. by can_init_stats() */
struct can_pkg_stats {
	unsigned long jiffies_init;

	atomic_long_t rx_frames;
	atomic_long_t tx_frames;
	atomic_long_t matches;

	unsigned long total_rx_rate;
	unsigned long total_tx_rate;
	unsigned long total_rx_match_ratio;

	unsigned long current_rx_rate;
	unsigned long current_tx_rate;
	unsigned long current_rx_match_ratio;

	unsigned long max_rx_rate;
	unsigned long max_tx_rate;
	unsigned long max_rx_match_ratio;

	atomic_long_t rx_frames_delta;
	atomic_long_t tx_frames_delta;
	atomic_long_t matches_delta;
};

/* persistent statistics */
struct can_rcv_lists_stats {
	unsigned long stats_reset;
	unsigned long user_reset;
	unsigned long rcv_entries;
	unsigned long rcv_entries_max;
};

/* function prototypes for the CAN networklayer procfs (proc.c) */
void can_init_proc(struct net *net);
void can_remove_proc(struct net *net);
void can_stat_update(struct timer_list *t);

#endif /* AF_CAN_H */

Annotation

• Immediate include surface: `linux/skbuff.h`, `linux/netdevice.h`, `linux/list.h`, `linux/rcupdate.h`, `linux/can.h`.
• Detected declarations: `struct receiver`, `struct can_pkg_stats`, `struct can_rcv_lists_stats`.
• Atlas domain: Networking Core / Sockets, Protocols, Packet Path, And Network Policy.
• Implementation status: source 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.