net/lapb/lapb_timer.c

File Facts

System

Linux kernel

Corpus path

net/lapb/lapb_timer.c

Extension

.c

Size

5013 bytes

Lines

207

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/errno.h
• linux/types.h
• linux/socket.h
• linux/in.h
• linux/kernel.h
• linux/jiffies.h
• linux/timer.h
• linux/string.h
• linux/sockios.h
• linux/net.h
• linux/inet.h
• linux/skbuff.h
• net/sock.h
• linux/uaccess.h
• linux/fcntl.h
• linux/mm.h
• linux/interrupt.h
• net/lapb.h

Detected Declarations

• function lapb_start_t1timer
• function lapb_start_t2timer
• function lapb_stop_t1timer
• function lapb_stop_t2timer
• function lapb_t1timer_running
• function lapb_t2timer_expiry
• function lapb_t1timer_expiry

Annotated Snippet

if (lapb->n2count == lapb->n2) {
				lapb_clear_queues(lapb);
				lapb->state = LAPB_STATE_0;
				lapb_disconnect_indication(lapb, LAPB_TIMEDOUT);
				lapb_dbg(0, "(%p) S1 -> S0\n", lapb->dev);
				lapb->t1timer_running = false;
				goto out;
			} else {
				lapb->n2count++;
				if (lapb->mode & LAPB_EXTENDED) {
					lapb_dbg(1, "(%p) S1 TX SABME(1)\n",
						 lapb->dev);
					lapb_send_control(lapb, LAPB_SABME, LAPB_POLLON, LAPB_COMMAND);
				} else {
					lapb_dbg(1, "(%p) S1 TX SABM(1)\n",
						 lapb->dev);
					lapb_send_control(lapb, LAPB_SABM, LAPB_POLLON, LAPB_COMMAND);
				}
			}
			break;

		/*
		 *	Awaiting disconnection state, send DISC, up to N2 times.
		 */
		case LAPB_STATE_2:
			if (lapb->n2count == lapb->n2) {
				lapb_clear_queues(lapb);
				lapb->state = LAPB_STATE_0;
				lapb_disconnect_confirmation(lapb, LAPB_TIMEDOUT);
				lapb_dbg(0, "(%p) S2 -> S0\n", lapb->dev);
				lapb->t1timer_running = false;
				goto out;
			} else {
				lapb->n2count++;
				lapb_dbg(1, "(%p) S2 TX DISC(1)\n", lapb->dev);
				lapb_send_control(lapb, LAPB_DISC, LAPB_POLLON, LAPB_COMMAND);
			}
			break;

		/*
		 *	Data transfer state, restransmit I frames, up to N2 times.
		 */
		case LAPB_STATE_3:
			if (lapb->n2count == lapb->n2) {
				lapb_clear_queues(lapb);
				lapb->state = LAPB_STATE_0;
				lapb_stop_t2timer(lapb);
				lapb_disconnect_indication(lapb, LAPB_TIMEDOUT);
				lapb_dbg(0, "(%p) S3 -> S0\n", lapb->dev);
				lapb->t1timer_running = false;
				goto out;
			} else {
				lapb->n2count++;
				lapb_requeue_frames(lapb);
				lapb_kick(lapb);
			}
			break;

		/*
		 *	Frame reject state, restransmit FRMR frames, up to N2 times.
		 */
		case LAPB_STATE_4:
			if (lapb->n2count == lapb->n2) {
				lapb_clear_queues(lapb);
				lapb->state = LAPB_STATE_0;
				lapb_disconnect_indication(lapb, LAPB_TIMEDOUT);
				lapb_dbg(0, "(%p) S4 -> S0\n", lapb->dev);
				lapb->t1timer_running = false;
				goto out;
			} else {
				lapb->n2count++;
				lapb_transmit_frmr(lapb);
			}
			break;
	}

	lapb_start_t1timer(lapb);

out:
	spin_unlock_bh(&lapb->lock);
}

Annotation

• Immediate include surface: `linux/errno.h`, `linux/types.h`, `linux/socket.h`, `linux/in.h`, `linux/kernel.h`, `linux/jiffies.h`, `linux/timer.h`, `linux/string.h`.
• Detected declarations: `function lapb_start_t1timer`, `function lapb_start_t2timer`, `function lapb_stop_t1timer`, `function lapb_stop_t2timer`, `function lapb_t1timer_running`, `function lapb_t2timer_expiry`, `function lapb_t1timer_expiry`.
• 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.