net/lapb/lapb_in.c

File Facts

System

Linux kernel

Corpus path

net/lapb/lapb_in.c

Extension

.c

Size

15015 bytes

Lines

557

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.
• 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/timer.h
• linux/string.h
• linux/sockios.h
• linux/net.h
• linux/inet.h
• linux/netdevice.h
• linux/skbuff.h
• linux/slab.h
• net/sock.h
• linux/uaccess.h
• linux/fcntl.h
• linux/mm.h
• linux/interrupt.h
• net/lapb.h

Detected Declarations

• function timer
• function timer
• function timer
• function timer
• function timer
• function lapb_data_input

Annotated Snippet

if (lapb->mode & LAPB_EXTENDED) {
			lapb_dbg(1, "(%p) S0 TX DM(%d)\n",
				 lapb->dev, frame->pf);
			lapb_send_control(lapb, LAPB_DM, frame->pf,
					  LAPB_RESPONSE);
		} else {
			lapb_dbg(1, "(%p) S0 TX UA(%d)\n",
				 lapb->dev, frame->pf);
			lapb_dbg(0, "(%p) S0 -> S3\n", lapb->dev);
			lapb_send_control(lapb, LAPB_UA, frame->pf,
					  LAPB_RESPONSE);
			lapb_stop_t1timer(lapb);
			lapb_stop_t2timer(lapb);
			lapb->state     = LAPB_STATE_3;
			lapb->condition = 0x00;
			lapb->n2count   = 0;
			lapb->vs        = 0;
			lapb->vr        = 0;
			lapb->va        = 0;
			lapb_connect_indication(lapb, LAPB_OK);
		}
		break;

	case LAPB_SABME:
		lapb_dbg(1, "(%p) S0 RX SABME(%d)\n", lapb->dev, frame->pf);
		if (lapb->mode & LAPB_EXTENDED) {
			lapb_dbg(1, "(%p) S0 TX UA(%d)\n",
				 lapb->dev, frame->pf);
			lapb_dbg(0, "(%p) S0 -> S3\n", lapb->dev);
			lapb_send_control(lapb, LAPB_UA, frame->pf,
					  LAPB_RESPONSE);
			lapb_stop_t1timer(lapb);
			lapb_stop_t2timer(lapb);
			lapb->state     = LAPB_STATE_3;
			lapb->condition = 0x00;
			lapb->n2count   = 0;
			lapb->vs        = 0;
			lapb->vr        = 0;
			lapb->va        = 0;
			lapb_connect_indication(lapb, LAPB_OK);
		} else {
			lapb_dbg(1, "(%p) S0 TX DM(%d)\n",
				 lapb->dev, frame->pf);
			lapb_send_control(lapb, LAPB_DM, frame->pf,
					  LAPB_RESPONSE);
		}
		break;

	case LAPB_DISC:
		lapb_dbg(1, "(%p) S0 RX DISC(%d)\n", lapb->dev, frame->pf);
		lapb_dbg(1, "(%p) S0 TX UA(%d)\n", lapb->dev, frame->pf);
		lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE);
		break;

	default:
		break;
	}

	kfree_skb(skb);
}

/*
 *	State machine for state 1, Awaiting Connection State.
 *	The handling of the timer(s) is in file lapb_timer.c.
 */
static void lapb_state1_machine(struct lapb_cb *lapb, struct sk_buff *skb,
				struct lapb_frame *frame)
{
	switch (frame->type) {
	case LAPB_SABM:
		lapb_dbg(1, "(%p) S1 RX SABM(%d)\n", lapb->dev, frame->pf);
		if (lapb->mode & LAPB_EXTENDED) {
			lapb_dbg(1, "(%p) S1 TX DM(%d)\n",
				 lapb->dev, frame->pf);
			lapb_send_control(lapb, LAPB_DM, frame->pf,
					  LAPB_RESPONSE);
		} else {
			lapb_dbg(1, "(%p) S1 TX UA(%d)\n",
				 lapb->dev, frame->pf);
			lapb_send_control(lapb, LAPB_UA, frame->pf,
					  LAPB_RESPONSE);
		}
		break;

	case LAPB_SABME:
		lapb_dbg(1, "(%p) S1 RX SABME(%d)\n", lapb->dev, frame->pf);
		if (lapb->mode & LAPB_EXTENDED) {
			lapb_dbg(1, "(%p) S1 TX UA(%d)\n",
				 lapb->dev, frame->pf);
			lapb_send_control(lapb, LAPB_UA, frame->pf,

Annotation

• Immediate include surface: `linux/errno.h`, `linux/types.h`, `linux/socket.h`, `linux/in.h`, `linux/kernel.h`, `linux/timer.h`, `linux/string.h`, `linux/sockios.h`.
• Detected declarations: `function timer`, `function timer`, `function timer`, `function timer`, `function timer`, `function lapb_data_input`.
• Atlas domain: Networking Core / Sockets, Protocols, Packet Path, And Network Policy.
• Implementation status: source implementation candidate.

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.