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Release 4.15 net/lapb/lapb_out.c

Directory: net/lapb
/*
 *      LAPB release 002
 *
 *      This code REQUIRES 2.1.15 or higher/ NET3.038
 *
 *      This module:
 *              This module is free software; you can redistribute it and/or
 *              modify it under the terms of the GNU General Public License
 *              as published by the Free Software Foundation; either version
 *              2 of the License, or (at your option) any later version.
 *
 *      History
 *      LAPB 001        Jonathan Naylor Started Coding
 *      LAPB 002        Jonathan Naylor New timer architecture.
 */


#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/inet.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <net/sock.h>
#include <linux/uaccess.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <net/lapb.h>

/*
 *  This procedure is passed a buffer descriptor for an iframe. It builds
 *  the rest of the control part of the frame and then writes it out.
 */

static void lapb_send_iframe(struct lapb_cb *lapb, struct sk_buff *skb, int poll_bit) { unsigned char *frame; if (!skb) return; if (lapb->mode & LAPB_EXTENDED) { frame = skb_push(skb, 2); frame[0] = LAPB_I; frame[0] |= lapb->vs << 1; frame[1] = poll_bit ? LAPB_EPF : 0; frame[1] |= lapb->vr << 1; } else { frame = skb_push(skb, 1); *frame = LAPB_I; *frame |= poll_bit ? LAPB_SPF : 0; *frame |= lapb->vr << 5; *frame |= lapb->vs << 1; } lapb_dbg(1, "(%p) S%d TX I(%d) S%d R%d\n", lapb->dev, lapb->state, poll_bit, lapb->vs, lapb->vr); lapb_transmit_buffer(lapb, skb, LAPB_COMMAND); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)16095.81%240.00%
Joe Perches42.40%120.00%
Arnaldo Carvalho de Melo21.20%120.00%
Al Viro10.60%120.00%
Total167100.00%5100.00%


void lapb_kick(struct lapb_cb *lapb) { struct sk_buff *skb, *skbn; unsigned short modulus, start, end; modulus = (lapb->mode & LAPB_EXTENDED) ? LAPB_EMODULUS : LAPB_SMODULUS; start = !skb_peek(&lapb->ack_queue) ? lapb->va : lapb->vs; end = (lapb->va + lapb->window) % modulus; if (!(lapb->condition & LAPB_PEER_RX_BUSY_CONDITION) && start != end && skb_peek(&lapb->write_queue)) { lapb->vs = start; /* * Dequeue the frame and copy it. */ skb = skb_dequeue(&lapb->write_queue); do { if ((skbn = skb_clone(skb, GFP_ATOMIC)) == NULL) { skb_queue_head(&lapb->write_queue, skb); break; } if (skb->sk) skb_set_owner_w(skbn, skb->sk); /* * Transmit the frame copy. */ lapb_send_iframe(lapb, skbn, LAPB_POLLOFF); lapb->vs = (lapb->vs + 1) % modulus; /* * Requeue the original data frame. */ skb_queue_tail(&lapb->ack_queue, skb); } while (lapb->vs != end && (skb = skb_dequeue(&lapb->write_queue)) != NULL); lapb->condition &= ~LAPB_ACK_PENDING_CONDITION; if (!lapb_t1timer_running(lapb)) lapb_start_t1timer(lapb); } }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)23799.16%375.00%
Arnaldo Carvalho de Melo20.84%125.00%
Total239100.00%4100.00%


void lapb_transmit_buffer(struct lapb_cb *lapb, struct sk_buff *skb, int type) { unsigned char *ptr; ptr = skb_push(skb, 1); if (lapb->mode & LAPB_MLP) { if (lapb->mode & LAPB_DCE) { if (type == LAPB_COMMAND) *ptr = LAPB_ADDR_C; if (type == LAPB_RESPONSE) *ptr = LAPB_ADDR_D; } else { if (type == LAPB_COMMAND) *ptr = LAPB_ADDR_D; if (type == LAPB_RESPONSE) *ptr = LAPB_ADDR_C; } } else { if (lapb->mode & LAPB_DCE) { if (type == LAPB_COMMAND) *ptr = LAPB_ADDR_A; if (type == LAPB_RESPONSE) *ptr = LAPB_ADDR_B; } else { if (type == LAPB_COMMAND) *ptr = LAPB_ADDR_B; if (type == LAPB_RESPONSE) *ptr = LAPB_ADDR_A; } } lapb_dbg(2, "(%p) S%d TX %3ph\n", lapb->dev, lapb->state, skb->data); if (!lapb_data_transmit(lapb, skb)) kfree_skb(skb); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)18796.89%233.33%
Joe Perches31.55%116.67%
Andy Shevchenko10.52%116.67%
Al Viro10.52%116.67%
Arnaldo Carvalho de Melo10.52%116.67%
Total193100.00%6100.00%


void lapb_establish_data_link(struct lapb_cb *lapb) { lapb->condition = 0x00; lapb->n2count = 0; if (lapb->mode & LAPB_EXTENDED) { lapb_dbg(1, "(%p) S%d TX SABME(1)\n", lapb->dev, lapb->state); lapb_send_control(lapb, LAPB_SABME, LAPB_POLLON, LAPB_COMMAND); } else { lapb_dbg(1, "(%p) S%d TX SABM(1)\n", lapb->dev, lapb->state); lapb_send_control(lapb, LAPB_SABM, LAPB_POLLON, LAPB_COMMAND); } lapb_start_t1timer(lapb); lapb_stop_t2timer(lapb); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)8688.66%350.00%
Joe Perches88.25%116.67%
Al Viro22.06%116.67%
Arnaldo Carvalho de Melo11.03%116.67%
Total97100.00%6100.00%


void lapb_enquiry_response(struct lapb_cb *lapb) { lapb_dbg(1, "(%p) S%d TX RR(1) R%d\n", lapb->dev, lapb->state, lapb->vr); lapb_send_control(lapb, LAPB_RR, LAPB_POLLON, LAPB_RESPONSE); lapb->condition &= ~LAPB_ACK_PENDING_CONDITION; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)4187.23%240.00%
Joe Perches48.51%120.00%
Al Viro12.13%120.00%
Arnaldo Carvalho de Melo12.13%120.00%
Total47100.00%5100.00%


void lapb_timeout_response(struct lapb_cb *lapb) { lapb_dbg(1, "(%p) S%d TX RR(0) R%d\n", lapb->dev, lapb->state, lapb->vr); lapb_send_control(lapb, LAPB_RR, LAPB_POLLOFF, LAPB_RESPONSE); lapb->condition &= ~LAPB_ACK_PENDING_CONDITION; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)4187.23%240.00%
Joe Perches48.51%120.00%
Arnaldo Carvalho de Melo12.13%120.00%
Al Viro12.13%120.00%
Total47100.00%5100.00%


void lapb_check_iframes_acked(struct lapb_cb *lapb, unsigned short nr) { if (lapb->vs == nr) { lapb_frames_acked(lapb, nr); lapb_stop_t1timer(lapb); lapb->n2count = 0; } else if (lapb->va != nr) { lapb_frames_acked(lapb, nr); lapb_start_t1timer(lapb); } }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)6396.92%375.00%
Arnaldo Carvalho de Melo23.08%125.00%
Total65100.00%4100.00%


void lapb_check_need_response(struct lapb_cb *lapb, int type, int pf) { if (type == LAPB_COMMAND && pf) lapb_enquiry_response(lapb); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)2896.55%150.00%
Arnaldo Carvalho de Melo13.45%150.00%
Total29100.00%2100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)89494.40%436.36%
Joe Perches303.17%19.09%
Arnaldo Carvalho de Melo111.16%19.09%
Al Viro60.63%19.09%
Tejun Heo30.32%19.09%
Linus Torvalds10.11%19.09%
Andy Shevchenko10.11%19.09%
Hideaki Yoshifuji / 吉藤英明10.11%19.09%
Total947100.00%11100.00%
Directory: net/lapb
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