^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * LAPB release 002
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * This code REQUIRES 2.1.15 or higher/ NET3.038
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * History
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * LAPB 001 Jonathan Naylor Started Coding
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/socket.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/in.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/timer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/sockios.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/net.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/inet.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/skbuff.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <net/sock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/fcntl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <net/lapb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) * This routine purges all the queues of frames.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) void lapb_clear_queues(struct lapb_cb *lapb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) skb_queue_purge(&lapb->write_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) skb_queue_purge(&lapb->ack_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) * This routine purges the input queue of those frames that have been
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * acknowledged. This replaces the boxes labelled "V(a) <- N(r)" on the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) * SDL diagram.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) void lapb_frames_acked(struct lapb_cb *lapb, unsigned short nr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) int modulus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) modulus = (lapb->mode & LAPB_EXTENDED) ? LAPB_EMODULUS : LAPB_SMODULUS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) * Remove all the ack-ed frames from the ack queue.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) if (lapb->va != nr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) while (skb_peek(&lapb->ack_queue) && lapb->va != nr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) skb = skb_dequeue(&lapb->ack_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) lapb->va = (lapb->va + 1) % modulus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) void lapb_requeue_frames(struct lapb_cb *lapb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) struct sk_buff *skb, *skb_prev = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) * Requeue all the un-ack-ed frames on the output queue to be picked
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) * up by lapb_kick called from the timer. This arrangement handles the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) * possibility of an empty output queue.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) while ((skb = skb_dequeue(&lapb->ack_queue)) != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) if (!skb_prev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) skb_queue_head(&lapb->write_queue, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) skb_append(skb_prev, skb, &lapb->write_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) skb_prev = skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) * Validate that the value of nr is between va and vs. Return true or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) * false for testing.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) int lapb_validate_nr(struct lapb_cb *lapb, unsigned short nr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) unsigned short vc = lapb->va;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) int modulus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) modulus = (lapb->mode & LAPB_EXTENDED) ? LAPB_EMODULUS : LAPB_SMODULUS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) while (vc != lapb->vs) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) if (nr == vc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) vc = (vc + 1) % modulus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) return nr == lapb->vs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) * This routine is the centralised routine for parsing the control
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) * information for the different frame formats.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) int lapb_decode(struct lapb_cb *lapb, struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) struct lapb_frame *frame)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) frame->type = LAPB_ILLEGAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) lapb_dbg(2, "(%p) S%d RX %3ph\n", lapb->dev, lapb->state, skb->data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) /* We always need to look at 2 bytes, sometimes we need
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) * to look at 3 and those cases are handled below.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) if (!pskb_may_pull(skb, 2))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) if (lapb->mode & LAPB_MLP) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) if (lapb->mode & LAPB_DCE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) if (skb->data[0] == LAPB_ADDR_D)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) frame->cr = LAPB_COMMAND;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) if (skb->data[0] == LAPB_ADDR_C)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) frame->cr = LAPB_RESPONSE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) if (skb->data[0] == LAPB_ADDR_C)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) frame->cr = LAPB_COMMAND;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) if (skb->data[0] == LAPB_ADDR_D)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) frame->cr = LAPB_RESPONSE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) if (lapb->mode & LAPB_DCE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) if (skb->data[0] == LAPB_ADDR_B)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) frame->cr = LAPB_COMMAND;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) if (skb->data[0] == LAPB_ADDR_A)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) frame->cr = LAPB_RESPONSE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) if (skb->data[0] == LAPB_ADDR_A)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) frame->cr = LAPB_COMMAND;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) if (skb->data[0] == LAPB_ADDR_B)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) frame->cr = LAPB_RESPONSE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) skb_pull(skb, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) if (lapb->mode & LAPB_EXTENDED) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) if (!(skb->data[0] & LAPB_S)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) if (!pskb_may_pull(skb, 2))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) * I frame - carries NR/NS/PF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) frame->type = LAPB_I;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) frame->ns = (skb->data[0] >> 1) & 0x7F;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) frame->nr = (skb->data[1] >> 1) & 0x7F;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) frame->pf = skb->data[1] & LAPB_EPF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) frame->control[0] = skb->data[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) frame->control[1] = skb->data[1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) skb_pull(skb, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) } else if ((skb->data[0] & LAPB_U) == 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) if (!pskb_may_pull(skb, 2))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) * S frame - take out PF/NR
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) frame->type = skb->data[0] & 0x0F;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) frame->nr = (skb->data[1] >> 1) & 0x7F;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) frame->pf = skb->data[1] & LAPB_EPF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) frame->control[0] = skb->data[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) frame->control[1] = skb->data[1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) skb_pull(skb, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) } else if ((skb->data[0] & LAPB_U) == 3) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) * U frame - take out PF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) frame->type = skb->data[0] & ~LAPB_SPF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) frame->pf = skb->data[0] & LAPB_SPF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) frame->control[0] = skb->data[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) frame->control[1] = 0x00;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) skb_pull(skb, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) if (!(skb->data[0] & LAPB_S)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) * I frame - carries NR/NS/PF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) frame->type = LAPB_I;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) frame->ns = (skb->data[0] >> 1) & 0x07;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) frame->nr = (skb->data[0] >> 5) & 0x07;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) frame->pf = skb->data[0] & LAPB_SPF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) } else if ((skb->data[0] & LAPB_U) == 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) * S frame - take out PF/NR
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) frame->type = skb->data[0] & 0x0F;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) frame->nr = (skb->data[0] >> 5) & 0x07;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) frame->pf = skb->data[0] & LAPB_SPF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) } else if ((skb->data[0] & LAPB_U) == 3) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) * U frame - take out PF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) frame->type = skb->data[0] & ~LAPB_SPF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) frame->pf = skb->data[0] & LAPB_SPF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) frame->control[0] = skb->data[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) skb_pull(skb, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) * This routine is called when the HDLC layer internally generates a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) * command or response for the remote machine ( eg. RR, UA etc. ).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) * Only supervisory or unnumbered frames are processed, FRMRs are handled
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) * by lapb_transmit_frmr below.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) void lapb_send_control(struct lapb_cb *lapb, int frametype,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) int poll_bit, int type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) unsigned char *dptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) if ((skb = alloc_skb(LAPB_HEADER_LEN + 3, GFP_ATOMIC)) == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) skb_reserve(skb, LAPB_HEADER_LEN + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) if (lapb->mode & LAPB_EXTENDED) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) if ((frametype & LAPB_U) == LAPB_U) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) dptr = skb_put(skb, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) *dptr = frametype;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) *dptr |= poll_bit ? LAPB_SPF : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) dptr = skb_put(skb, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) dptr[0] = frametype;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) dptr[1] = (lapb->vr << 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) dptr[1] |= poll_bit ? LAPB_EPF : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) dptr = skb_put(skb, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) *dptr = frametype;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) *dptr |= poll_bit ? LAPB_SPF : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) if ((frametype & LAPB_U) == LAPB_S) /* S frames carry NR */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) *dptr |= (lapb->vr << 5);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) lapb_transmit_buffer(lapb, skb, type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) * This routine generates FRMRs based on information previously stored in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) * the LAPB control block.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) void lapb_transmit_frmr(struct lapb_cb *lapb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) unsigned char *dptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) if ((skb = alloc_skb(LAPB_HEADER_LEN + 7, GFP_ATOMIC)) == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) skb_reserve(skb, LAPB_HEADER_LEN + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) if (lapb->mode & LAPB_EXTENDED) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) dptr = skb_put(skb, 6);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) *dptr++ = LAPB_FRMR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) *dptr++ = lapb->frmr_data.control[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) *dptr++ = lapb->frmr_data.control[1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) *dptr++ = (lapb->vs << 1) & 0xFE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) *dptr = (lapb->vr << 1) & 0xFE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) if (lapb->frmr_data.cr == LAPB_RESPONSE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) *dptr |= 0x01;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) dptr++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) *dptr++ = lapb->frmr_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) lapb_dbg(1, "(%p) S%d TX FRMR %5ph\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) lapb->dev, lapb->state,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) &skb->data[1]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) dptr = skb_put(skb, 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) *dptr++ = LAPB_FRMR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) *dptr++ = lapb->frmr_data.control[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) *dptr = (lapb->vs << 1) & 0x0E;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) *dptr |= (lapb->vr << 5) & 0xE0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) if (lapb->frmr_data.cr == LAPB_RESPONSE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) *dptr |= 0x10;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) dptr++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) *dptr++ = lapb->frmr_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) lapb_dbg(1, "(%p) S%d TX FRMR %3ph\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) lapb->dev, lapb->state, &skb->data[1]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) lapb_transmit_buffer(lapb, skb, LAPB_RESPONSE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
3 Commits
0 Branches
0 Tags