cregit-Linux how code gets into the kernel

Release 4.11 net/ax25/ax25_subr.c

Directory: net/ax25
/*
 * This program 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.
 *
 * Copyright (C) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
 * Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de)
 * Copyright (C) Frederic Rible F1OAT (frible@teaser.fr)
 */
#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/slab.h>
#include <net/ax25.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <net/tcp_states.h>
#include <linux/uaccess.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/interrupt.h>

/*
 *      This routine purges all the queues of frames.
 */

void ax25_clear_queues(ax25_cb *ax25) { skb_queue_purge(&ax25->write_queue); skb_queue_purge(&ax25->ack_queue); skb_queue_purge(&ax25->reseq_queue); skb_queue_purge(&ax25->frag_queue); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)3790.24%266.67%
Linus Torvalds49.76%133.33%
Total41100.00%3100.00%

/* * This routine purges the input queue of those frames that have been * acknowledged. This replaces the boxes labelled "V(a) <- N(r)" on the * SDL diagram. */
void ax25_frames_acked(ax25_cb *ax25, unsigned short nr) { struct sk_buff *skb; /* * Remove all the ack-ed frames from the ack queue. */ if (ax25->va != nr) { while (skb_peek(&ax25->ack_queue) != NULL && ax25->va != nr) { skb = skb_dequeue(&ax25->ack_queue); kfree_skb(skb); ax25->va = (ax25->va + 1) % ax25->modulus; } } }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)80100.00%3100.00%
Total80100.00%3100.00%


void ax25_requeue_frames(ax25_cb *ax25) { struct sk_buff *skb; /* * Requeue all the un-ack-ed frames on the output queue to be picked * up by ax25_kick called from the timer. This arrangement handles the * possibility of an empty output queue. */ while ((skb = skb_dequeue_tail(&ax25->ack_queue)) != NULL) skb_queue_head(&ax25->write_queue, skb); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)4097.56%266.67%
Jarek Poplawski12.44%133.33%
Total41100.00%3100.00%

/* * Validate that the value of nr is between va and vs. Return true or * false for testing. */
int ax25_validate_nr(ax25_cb *ax25, unsigned short nr) { unsigned short vc = ax25->va; while (vc != ax25->vs) { if (nr == vc) return 1; vc = (vc + 1) % ax25->modulus; } if (nr == ax25->vs) return 1; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)66100.00%2100.00%
Total66100.00%2100.00%

/* * This routine is the centralised routine for parsing the control * information for the different frame formats. */
int ax25_decode(ax25_cb *ax25, struct sk_buff *skb, int *ns, int *nr, int *pf) { unsigned char *frame; int frametype = AX25_ILLEGAL; frame = skb->data; *ns = *nr = *pf = 0; if (ax25->modulus == AX25_MODULUS) { if ((frame[0] & AX25_S) == 0) { frametype = AX25_I; /* I frame - carries NR/NS/PF */ *ns = (frame[0] >> 1) & 0x07; *nr = (frame[0] >> 5) & 0x07; *pf = frame[0] & AX25_PF; } else if ((frame[0] & AX25_U) == 1) { /* S frame - take out PF/NR */ frametype = frame[0] & 0x0F; *nr = (frame[0] >> 5) & 0x07; *pf = frame[0] & AX25_PF; } else if ((frame[0] & AX25_U) == 3) { /* U frame - take out PF */ frametype = frame[0] & ~AX25_PF; *pf = frame[0] & AX25_PF; } skb_pull(skb, 1); } else { if ((frame[0] & AX25_S) == 0) { frametype = AX25_I; /* I frame - carries NR/NS/PF */ *ns = (frame[0] >> 1) & 0x7F; *nr = (frame[1] >> 1) & 0x7F; *pf = frame[1] & AX25_EPF; skb_pull(skb, 2); } else if ((frame[0] & AX25_U) == 1) { /* S frame - take out PF/NR */ frametype = frame[0] & 0x0F; *nr = (frame[1] >> 1) & 0x7F; *pf = frame[1] & AX25_EPF; skb_pull(skb, 2); } else if ((frame[0] & AX25_U) == 3) { /* U frame - take out PF */ frametype = frame[0] & ~AX25_PF; *pf = frame[0] & AX25_PF; skb_pull(skb, 1); } } return frametype; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)387100.00%3100.00%
Total387100.00%3100.00%

/* * This routine is called when the HDLC layer internally generates a * command or response for the remote machine ( eg. RR, UA etc. ). * Only supervisory or unnumbered frames are processed. */
void ax25_send_control(ax25_cb *ax25, int frametype, int poll_bit, int type) { struct sk_buff *skb; unsigned char *dptr; if ((skb = alloc_skb(ax25->ax25_dev->dev->hard_header_len + 2, GFP_ATOMIC)) == NULL) return; skb_reserve(skb, ax25->ax25_dev->dev->hard_header_len); skb_reset_network_header(skb); /* Assume a response - address structure for DTE */ if (ax25->modulus == AX25_MODULUS) { dptr = skb_put(skb, 1); *dptr = frametype; *dptr |= (poll_bit) ? AX25_PF : 0; if ((frametype & AX25_U) == AX25_S) /* S frames carry NR */ *dptr |= (ax25->vr << 5); } else { if ((frametype & AX25_U) == AX25_U) { dptr = skb_put(skb, 1); *dptr = frametype; *dptr |= (poll_bit) ? AX25_PF : 0; } else { dptr = skb_put(skb, 2); dptr[0] = frametype; dptr[1] = (ax25->vr << 1); dptr[1] |= (poll_bit) ? AX25_EPF : 0; } } ax25_transmit_buffer(ax25, skb, type); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)20994.14%675.00%
Jeroen Vreeken104.50%112.50%
Arnaldo Carvalho de Melo31.35%112.50%
Total222100.00%8100.00%

/* * Send a 'DM' to an unknown connection attempt, or an invalid caller. * * Note: src here is the sender, thus it's the target of the DM */
void ax25_return_dm(struct net_device *dev, ax25_address *src, ax25_address *dest, ax25_digi *digi) { struct sk_buff *skb; char *dptr; ax25_digi retdigi; if (dev == NULL) return; if ((skb = alloc_skb(dev->hard_header_len + 1, GFP_ATOMIC)) == NULL) return; /* Next SABM will get DM'd */ skb_reserve(skb, dev->hard_header_len); skb_reset_network_header(skb); ax25_digi_invert(digi, &retdigi); dptr = skb_put(skb, 1); *dptr = AX25_DM | AX25_PF; /* * Do the address ourselves */ dptr = skb_push(skb, ax25_addr_size(digi)); dptr += ax25_addr_build(dptr, dest, src, &retdigi, AX25_RESPONSE, AX25_MODULUS); ax25_queue_xmit(skb, dev); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)12792.03%872.73%
Jeroen Vreeken64.35%19.09%
Arnaldo Carvalho de Melo53.62%218.18%
Total138100.00%11100.00%

/* * Exponential backoff for AX.25 */
void ax25_calculate_t1(ax25_cb *ax25) { int n, t = 2; switch (ax25->backoff) { case 0: break; case 1: t += 2 * ax25->n2count; break; case 2: for (n = 0; n < ax25->n2count; n++) t *= 2; if (t > 8) t = 8; break; } ax25->t1 = t * ax25->rtt; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)83100.00%5100.00%
Total83100.00%5100.00%

/* * Calculate the Round Trip Time */
void ax25_calculate_rtt(ax25_cb *ax25) { if (ax25->backoff == 0) return; if (ax25_t1timer_running(ax25) && ax25->n2count == 0) ax25->rtt = (9 * ax25->rtt + ax25->t1 - ax25_display_timer(&ax25->t1timer)) / 10; if (ax25->rtt < AX25_T1CLAMPLO) ax25->rtt = AX25_T1CLAMPLO; if (ax25->rtt > AX25_T1CLAMPHI) ax25->rtt = AX25_T1CLAMPHI; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)85100.00%5100.00%
Total85100.00%5100.00%


void ax25_disconnect(ax25_cb *ax25, int reason) { ax25_clear_queues(ax25); if (!ax25->sk || !sock_flag(ax25->sk, SOCK_DESTROY)) ax25_stop_heartbeat(ax25); ax25_stop_t1timer(ax25); ax25_stop_t2timer(ax25); ax25_stop_t3timer(ax25); ax25_stop_idletimer(ax25); ax25->state = AX25_STATE_0; ax25_link_failed(ax25, reason); if (ax25->sk != NULL) { local_bh_disable(); bh_lock_sock(ax25->sk); ax25->sk->sk_state = TCP_CLOSE; ax25->sk->sk_err = reason; ax25->sk->sk_shutdown |= SEND_SHUTDOWN; if (!sock_flag(ax25->sk, SOCK_DEAD)) { ax25->sk->sk_state_change(ax25->sk); sock_set_flag(ax25->sk, SOCK_DEAD); } bh_unlock_sock(ax25->sk); local_bh_enable(); } }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)10263.75%111.11%
Basil Gunn1710.62%222.22%
Jeroen Vreeken148.75%111.11%
Arnaldo Carvalho de Melo127.50%222.22%
Jarek Poplawski63.75%111.11%
Richard Stearn53.12%111.11%
James Morris42.50%111.11%
Total160100.00%9100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)127693.00%1445.16%
Jeroen Vreeken302.19%13.23%
Arnaldo Carvalho de Melo211.53%516.13%
Basil Gunn171.24%26.45%
Jarek Poplawski70.51%26.45%
Richard Stearn50.36%13.23%
Linus Torvalds50.36%26.45%
James Morris40.29%13.23%
Tejun Heo30.22%13.23%
David S. Miller20.15%13.23%
Ralf Bächle20.15%13.23%
Total1372100.00%31100.00%
Directory: net/ax25
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.