cregit-Linux how code gets into the kernel

Release 4.11 net/rose/rose_subr.c

Directory: net/rose
/*
 * 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) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
 */
#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/fcntl.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <net/rose.h>

static int rose_create_facilities(unsigned char *buffer, struct rose_sock *rose);

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

void rose_clear_queues(struct sock *sk) { skb_queue_purge(&sk->sk_write_queue); skb_queue_purge(&rose_sk(sk)->ack_queue); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)2379.31%240.00%
David S. Miller310.34%120.00%
Linus Torvalds26.90%120.00%
Arnaldo Carvalho de Melo13.45%120.00%
Total29100.00%5100.00%

/* * 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 rose_frames_acked(struct sock *sk, unsigned short nr) { struct sk_buff *skb; struct rose_sock *rose = rose_sk(sk); /* * Remove all the ack-ed frames from the ack queue. */ if (rose->va != nr) { while (skb_peek(&rose->ack_queue) != NULL && rose->va != nr) { skb = skb_dequeue(&rose->ack_queue); kfree_skb(skb); rose->va = (rose->va + 1) % ROSE_MODULUS; } } }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)7988.76%250.00%
David S. Miller88.99%125.00%
Ralf Bächle22.25%125.00%
Total89100.00%4100.00%


void rose_requeue_frames(struct sock *sk) { struct sk_buff *skb, *skb_prev = NULL; /* * Requeue all the un-ack-ed frames on the output queue to be picked * up by rose_kick. This arrangement handles the possibility of an * empty output queue. */ while ((skb = skb_dequeue(&rose_sk(sk)->ack_queue)) != NULL) { if (skb_prev == NULL) skb_queue_head(&sk->sk_write_queue, skb); else skb_append(skb_prev, skb, &sk->sk_write_queue); skb_prev = skb; } }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)6688.00%240.00%
David S. Miller810.67%240.00%
Arnaldo Carvalho de Melo11.33%120.00%
Total75100.00%5100.00%

/* * Validate that the value of nr is between va and vs. Return true or * false for testing. */
int rose_validate_nr(struct sock *sk, unsigned short nr) { struct rose_sock *rose = rose_sk(sk); unsigned short vc = rose->va; while (vc != rose->vs) { if (nr == vc) return 1; vc = (vc + 1) % ROSE_MODULUS; } return nr == rose->vs; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)5783.82%133.33%
David S. Miller913.24%133.33%
Ralf Bächle22.94%133.33%
Total68100.00%3100.00%

/* * This routine is called when the packet layer internally generates a * control frame. */
void rose_write_internal(struct sock *sk, int frametype) { struct rose_sock *rose = rose_sk(sk); struct sk_buff *skb; unsigned char *dptr; unsigned char lci1, lci2; char buffer[100]; int len, faclen = 0; len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 1; switch (frametype) { case ROSE_CALL_REQUEST: len += 1 + ROSE_ADDR_LEN + ROSE_ADDR_LEN; faclen = rose_create_facilities(buffer, rose); len += faclen; break; case ROSE_CALL_ACCEPTED: case ROSE_CLEAR_REQUEST: case ROSE_RESET_REQUEST: len += 2; break; } if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL) return; /* * Space for AX.25 header and PID. */ skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + 1); dptr = skb_put(skb, skb_tailroom(skb)); lci1 = (rose->lci >> 8) & 0x0F; lci2 = (rose->lci >> 0) & 0xFF; switch (frametype) { case ROSE_CALL_REQUEST: *dptr++ = ROSE_GFI | lci1; *dptr++ = lci2; *dptr++ = frametype; *dptr++ = ROSE_CALL_REQ_ADDR_LEN_VAL; memcpy(dptr, &rose->dest_addr, ROSE_ADDR_LEN); dptr += ROSE_ADDR_LEN; memcpy(dptr, &rose->source_addr, ROSE_ADDR_LEN); dptr += ROSE_ADDR_LEN; memcpy(dptr, buffer, faclen); dptr += faclen; break; case ROSE_CALL_ACCEPTED: *dptr++ = ROSE_GFI | lci1; *dptr++ = lci2; *dptr++ = frametype; *dptr++ = 0x00; /* Address length */ *dptr++ = 0; /* Facilities length */ break; case ROSE_CLEAR_REQUEST: *dptr++ = ROSE_GFI | lci1; *dptr++ = lci2; *dptr++ = frametype; *dptr++ = rose->cause; *dptr++ = rose->diagnostic; break; case ROSE_RESET_REQUEST: *dptr++ = ROSE_GFI | lci1; *dptr++ = lci2; *dptr++ = frametype; *dptr++ = ROSE_DTE_ORIGINATED; *dptr++ = 0; break; case ROSE_RR: case ROSE_RNR: *dptr++ = ROSE_GFI | lci1; *dptr++ = lci2; *dptr = frametype; *dptr++ |= (rose->vr << 5) & 0xE0; break; case ROSE_CLEAR_CONFIRMATION: case ROSE_RESET_CONFIRMATION: *dptr++ = ROSE_GFI | lci1; *dptr++ = lci2; *dptr++ = frametype; break; default: printk(KERN_ERR "ROSE: rose_write_internal - invalid frametype %02X\n", frametype); kfree_skb(skb); return; } rose_transmit_link(skb, rose->neighbour); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)44697.59%457.14%
David S. Miller81.75%114.29%
Ralf Bächle20.44%114.29%
Ben Hutchings10.22%114.29%
Total457100.00%7100.00%


int rose_decode(struct sk_buff *skb, int *ns, int *nr, int *q, int *d, int *m) { unsigned char *frame; frame = skb->data; *ns = *nr = *q = *d = *m = 0; switch (frame[2]) { case ROSE_CALL_REQUEST: case ROSE_CALL_ACCEPTED: case ROSE_CLEAR_REQUEST: case ROSE_CLEAR_CONFIRMATION: case ROSE_RESET_REQUEST: case ROSE_RESET_CONFIRMATION: return frame[2]; default: break; } if ((frame[2] & 0x1F) == ROSE_RR || (frame[2] & 0x1F) == ROSE_RNR) { *nr = (frame[2] >> 5) & 0x07; return frame[2] & 0x1F; } if ((frame[2] & 0x01) == ROSE_DATA) { *q = (frame[0] & ROSE_Q_BIT) == ROSE_Q_BIT; *d = (frame[0] & ROSE_D_BIT) == ROSE_D_BIT; *m = (frame[2] & ROSE_M_BIT) == ROSE_M_BIT; *nr = (frame[2] >> 5) & 0x07; *ns = (frame[2] >> 1) & 0x07; return ROSE_DATA; } return ROSE_ILLEGAL; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)232100.00%2100.00%
Total232100.00%2100.00%


static int rose_parse_national(unsigned char *p, struct rose_facilities_struct *facilities, int len) { unsigned char *pt; unsigned char l, lg, n = 0; int fac_national_digis_received = 0; do { switch (*p & 0xC0) { case 0x00: if (len < 2) return -1; p += 2; n += 2; len -= 2; break; case 0x40: if (len < 3) return -1; if (*p == FAC_NATIONAL_RAND) facilities->rand = ((p[1] << 8) & 0xFF00) + ((p[2] << 0) & 0x00FF); p += 3; n += 3; len -= 3; break; case 0x80: if (len < 4) return -1; p += 4; n += 4; len -= 4; break; case 0xC0: if (len < 2) return -1; l = p[1]; if (len < 2 + l) return -1; if (*p == FAC_NATIONAL_DEST_DIGI) { if (!fac_national_digis_received) { if (l < AX25_ADDR_LEN) return -1; memcpy(&facilities->source_digis[0], p + 2, AX25_ADDR_LEN); facilities->source_ndigis = 1; } } else if (*p == FAC_NATIONAL_SRC_DIGI) { if (!fac_national_digis_received) { if (l < AX25_ADDR_LEN) return -1; memcpy(&facilities->dest_digis[0], p + 2, AX25_ADDR_LEN); facilities->dest_ndigis = 1; } } else if (*p == FAC_NATIONAL_FAIL_CALL) { if (l < AX25_ADDR_LEN) return -1; memcpy(&facilities->fail_call, p + 2, AX25_ADDR_LEN); } else if (*p == FAC_NATIONAL_FAIL_ADD) { if (l < 1 + ROSE_ADDR_LEN) return -1; memcpy(&facilities->fail_addr, p + 3, ROSE_ADDR_LEN); } else if (*p == FAC_NATIONAL_DIGIS) { if (l % AX25_ADDR_LEN) return -1; fac_national_digis_received = 1; facilities->source_ndigis = 0; facilities->dest_ndigis = 0; for (pt = p + 2, lg = 0 ; lg < l ; pt += AX25_ADDR_LEN, lg += AX25_ADDR_LEN) { if (pt[6] & AX25_HBIT) { if (facilities->dest_ndigis >= ROSE_MAX_DIGIS) return -1; memcpy(&facilities->dest_digis[facilities->dest_ndigis++], pt, AX25_ADDR_LEN); } else { if (facilities->source_ndigis >= ROSE_MAX_DIGIS) return -1; memcpy(&facilities->source_digis[facilities->source_ndigis++], pt, AX25_ADDR_LEN); } } } p += l + 2; n += l + 2; len -= l + 2; break; } } while (*p != 0x00 && len > 0); return n; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)40575.42%360.00%
Ben Hutchings10419.37%120.00%
Dan Rosenberg285.21%120.00%
Total537100.00%5100.00%


static int rose_parse_ccitt(unsigned char *p, struct rose_facilities_struct *facilities, int len) { unsigned char l, n = 0; char callsign[11]; do { switch (*p & 0xC0) { case 0x00: if (len < 2) return -1; p += 2; n += 2; len -= 2; break; case 0x40: if (len < 3) return -1; p += 3; n += 3; len -= 3; break; case 0x80: if (len < 4) return -1; p += 4; n += 4; len -= 4; break; case 0xC0: if (len < 2) return -1; l = p[1]; /* Prevent overflows*/ if (l < 10 || l > 20) return -1; if (*p == FAC_CCITT_DEST_NSAP) { memcpy(&facilities->source_addr, p + 7, ROSE_ADDR_LEN); memcpy(callsign, p + 12, l - 10); callsign[l - 10] = '\0'; asc2ax(&facilities->source_call, callsign); } if (*p == FAC_CCITT_SRC_NSAP) { memcpy(&facilities->dest_addr, p + 7, ROSE_ADDR_LEN); memcpy(callsign, p + 12, l - 10); callsign[l - 10] = '\0'; asc2ax(&facilities->dest_call, callsign); } p += l + 2; n += l + 2; len -= l + 2; break; } } while (*p != 0x00 && len > 0); return n; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)23979.14%350.00%
Ben Hutchings4013.25%116.67%
Dan Rosenberg154.97%116.67%
Ralf Bächle82.65%116.67%
Total302100.00%6100.00%


int rose_parse_facilities(unsigned char *p, unsigned packet_len, struct rose_facilities_struct *facilities) { int facilities_len, len; facilities_len = *p++; if (facilities_len == 0 || (unsigned int)facilities_len > packet_len) return 0; while (facilities_len >= 3 && *p == 0x00) { facilities_len--; p++; switch (*p) { case FAC_NATIONAL: /* National */ len = rose_parse_national(p + 1, facilities, facilities_len - 1); break; case FAC_CCITT: /* CCITT */ len = rose_parse_ccitt(p + 1, facilities, facilities_len - 1); break; default: printk(KERN_DEBUG "ROSE: rose_parse_facilities - unknown facilities family %02X\n", *p); len = 1; break; } if (len < 0) return 0; if (WARN_ON(len >= facilities_len)) return 0; facilities_len -= len + 1; p += len + 1; } return facilities_len == 0; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)11066.67%350.00%
Ben Hutchings4527.27%116.67%
Dan Rosenberg95.45%116.67%
Eric Dumazet10.61%116.67%
Total165100.00%6100.00%


static int rose_create_facilities(unsigned char *buffer, struct rose_sock *rose) { unsigned char *p = buffer + 1; char *callsign; char buf[11]; int len, nb; /* National Facilities */ if (rose->rand != 0 || rose->source_ndigis == 1 || rose->dest_ndigis == 1) { *p++ = 0x00; *p++ = FAC_NATIONAL; if (rose->rand != 0) { *p++ = FAC_NATIONAL_RAND; *p++ = (rose->rand >> 8) & 0xFF; *p++ = (rose->rand >> 0) & 0xFF; } /* Sent before older facilities */ if ((rose->source_ndigis > 0) || (rose->dest_ndigis > 0)) { int maxdigi = 0; *p++ = FAC_NATIONAL_DIGIS; *p++ = AX25_ADDR_LEN * (rose->source_ndigis + rose->dest_ndigis); for (nb = 0 ; nb < rose->source_ndigis ; nb++) { if (++maxdigi >= ROSE_MAX_DIGIS) break; memcpy(p, &rose->source_digis[nb], AX25_ADDR_LEN); p[6] |= AX25_HBIT; p += AX25_ADDR_LEN; } for (nb = 0 ; nb < rose->dest_ndigis ; nb++) { if (++maxdigi >= ROSE_MAX_DIGIS) break; memcpy(p, &rose->dest_digis[nb], AX25_ADDR_LEN); p[6] &= ~AX25_HBIT; p += AX25_ADDR_LEN; } } /* For compatibility */ if (rose->source_ndigis > 0) { *p++ = FAC_NATIONAL_SRC_DIGI; *p++ = AX25_ADDR_LEN; memcpy(p, &rose->source_digis[0], AX25_ADDR_LEN); p += AX25_ADDR_LEN; } /* For compatibility */ if (rose->dest_ndigis > 0) { *p++ = FAC_NATIONAL_DEST_DIGI; *p++ = AX25_ADDR_LEN; memcpy(p, &rose->dest_digis[0], AX25_ADDR_LEN); p += AX25_ADDR_LEN; } } *p++ = 0x00; *p++ = FAC_CCITT; *p++ = FAC_CCITT_DEST_NSAP; callsign = ax2asc(buf, &rose->dest_call); *p++ = strlen(callsign) + 10; *p++ = (strlen(callsign) + 9) * 2; /* ??? */ *p++ = 0x47; *p++ = 0x00; *p++ = 0x11; *p++ = ROSE_ADDR_LEN * 2; memcpy(p, &rose->dest_addr, ROSE_ADDR_LEN); p += ROSE_ADDR_LEN; memcpy(p, callsign, strlen(callsign)); p += strlen(callsign); *p++ = FAC_CCITT_SRC_NSAP; callsign = ax2asc(buf, &rose->source_call); *p++ = strlen(callsign) + 10; *p++ = (strlen(callsign) + 9) * 2; /* ??? */ *p++ = 0x47; *p++ = 0x00; *p++ = 0x11; *p++ = ROSE_ADDR_LEN * 2; memcpy(p, &rose->source_addr, ROSE_ADDR_LEN); p += ROSE_ADDR_LEN; memcpy(p, callsign, strlen(callsign)); p += strlen(callsign); len = p - buffer; buffer[0] = len - 1; return len; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)58397.82%240.00%
Ralf Bächle122.01%240.00%
Adrian Bunk10.17%120.00%
Total596100.00%5100.00%


void rose_disconnect(struct sock *sk, int reason, int cause, int diagnostic) { struct rose_sock *rose = rose_sk(sk); rose_stop_timer(sk); rose_stop_idletimer(sk); rose_clear_queues(sk); rose->lci = 0; rose->state = ROSE_STATE_0; if (cause != -1) rose->cause = cause; if (diagnostic != -1) rose->diagnostic = diagnostic; sk->sk_state = TCP_CLOSE; sk->sk_err = reason; sk->sk_shutdown |= SEND_SHUTDOWN; if (!sock_flag(sk, SOCK_DEAD)) { sk->sk_state_change(sk); sock_set_flag(sk, SOCK_DEAD); } }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)10079.37%116.67%
Arnaldo Carvalho de Melo129.52%233.33%
David S. Miller86.35%116.67%
James Morris43.17%116.67%
Ralf Bächle21.59%116.67%
Total126100.00%6100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)239786.97%627.27%
Ben Hutchings1906.89%14.55%
Dan Rosenberg521.89%14.55%
David S. Miller461.67%29.09%
Ralf Bächle321.16%418.18%
Arnaldo Carvalho de Melo150.54%313.64%
Adrian Bunk140.51%14.55%
James Morris40.15%14.55%
Tejun Heo30.11%14.55%
Linus Torvalds20.07%14.55%
Eric Dumazet10.04%14.55%
Total2756100.00%22100.00%
Directory: net/rose
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