Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * LAPB release 002 |
| 3 | * |
| 4 | * This code REQUIRES 2.1.15 or higher/ NET3.038 |
| 5 | * |
| 6 | * This module: |
| 7 | * This module is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License |
| 9 | * as published by the Free Software Foundation; either version |
| 10 | * 2 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * History |
| 13 | * LAPB 001 Jonathan Naulor Started Coding |
| 14 | * LAPB 002 Jonathan Naylor New timer architecture. |
| 15 | * 2000-10-29 Henner Eisen lapb_data_indication() return status. |
| 16 | */ |
| 17 | |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 18 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 19 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/errno.h> |
| 21 | #include <linux/types.h> |
| 22 | #include <linux/socket.h> |
| 23 | #include <linux/in.h> |
| 24 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/timer.h> |
| 26 | #include <linux/string.h> |
| 27 | #include <linux/sockios.h> |
| 28 | #include <linux/net.h> |
| 29 | #include <linux/inet.h> |
| 30 | #include <linux/netdevice.h> |
| 31 | #include <linux/skbuff.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 32 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include <net/sock.h> |
Linus Torvalds | 7c0f6ba | 2016-12-24 11:46:01 -0800 | [diff] [blame] | 34 | #include <linux/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <linux/fcntl.h> |
| 36 | #include <linux/mm.h> |
| 37 | #include <linux/interrupt.h> |
| 38 | #include <net/lapb.h> |
| 39 | |
| 40 | /* |
| 41 | * State machine for state 0, Disconnected State. |
| 42 | * The handling of the timer(s) is in file lapb_timer.c. |
| 43 | */ |
| 44 | static void lapb_state0_machine(struct lapb_cb *lapb, struct sk_buff *skb, |
| 45 | struct lapb_frame *frame) |
| 46 | { |
| 47 | switch (frame->type) { |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 48 | case LAPB_SABM: |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 49 | lapb_dbg(1, "(%p) S0 RX SABM(%d)\n", lapb->dev, frame->pf); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 50 | if (lapb->mode & LAPB_EXTENDED) { |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 51 | lapb_dbg(1, "(%p) S0 TX DM(%d)\n", |
| 52 | lapb->dev, frame->pf); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 53 | lapb_send_control(lapb, LAPB_DM, frame->pf, |
| 54 | LAPB_RESPONSE); |
| 55 | } else { |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 56 | lapb_dbg(1, "(%p) S0 TX UA(%d)\n", |
| 57 | lapb->dev, frame->pf); |
| 58 | lapb_dbg(0, "(%p) S0 -> S3\n", lapb->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | lapb_send_control(lapb, LAPB_UA, frame->pf, |
| 60 | LAPB_RESPONSE); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 61 | lapb_stop_t1timer(lapb); |
| 62 | lapb_stop_t2timer(lapb); |
| 63 | lapb->state = LAPB_STATE_3; |
| 64 | lapb->condition = 0x00; |
| 65 | lapb->n2count = 0; |
| 66 | lapb->vs = 0; |
| 67 | lapb->vr = 0; |
| 68 | lapb->va = 0; |
| 69 | lapb_connect_indication(lapb, LAPB_OK); |
| 70 | } |
| 71 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 73 | case LAPB_SABME: |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 74 | lapb_dbg(1, "(%p) S0 RX SABME(%d)\n", lapb->dev, frame->pf); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 75 | if (lapb->mode & LAPB_EXTENDED) { |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 76 | lapb_dbg(1, "(%p) S0 TX UA(%d)\n", |
| 77 | lapb->dev, frame->pf); |
| 78 | lapb_dbg(0, "(%p) S0 -> S3\n", lapb->dev); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 79 | lapb_send_control(lapb, LAPB_UA, frame->pf, |
| 80 | LAPB_RESPONSE); |
| 81 | lapb_stop_t1timer(lapb); |
| 82 | lapb_stop_t2timer(lapb); |
| 83 | lapb->state = LAPB_STATE_3; |
| 84 | lapb->condition = 0x00; |
| 85 | lapb->n2count = 0; |
| 86 | lapb->vs = 0; |
| 87 | lapb->vr = 0; |
| 88 | lapb->va = 0; |
| 89 | lapb_connect_indication(lapb, LAPB_OK); |
| 90 | } else { |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 91 | lapb_dbg(1, "(%p) S0 TX DM(%d)\n", |
| 92 | lapb->dev, frame->pf); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 93 | lapb_send_control(lapb, LAPB_DM, frame->pf, |
| 94 | LAPB_RESPONSE); |
| 95 | } |
| 96 | break; |
| 97 | |
| 98 | case LAPB_DISC: |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 99 | lapb_dbg(1, "(%p) S0 RX DISC(%d)\n", lapb->dev, frame->pf); |
| 100 | lapb_dbg(1, "(%p) S0 TX UA(%d)\n", lapb->dev, frame->pf); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 101 | lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE); |
| 102 | break; |
| 103 | |
| 104 | default: |
| 105 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | } |
| 107 | |
| 108 | kfree_skb(skb); |
| 109 | } |
| 110 | |
| 111 | /* |
| 112 | * State machine for state 1, Awaiting Connection State. |
| 113 | * The handling of the timer(s) is in file lapb_timer.c. |
| 114 | */ |
| 115 | static void lapb_state1_machine(struct lapb_cb *lapb, struct sk_buff *skb, |
| 116 | struct lapb_frame *frame) |
| 117 | { |
| 118 | switch (frame->type) { |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 119 | case LAPB_SABM: |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 120 | lapb_dbg(1, "(%p) S1 RX SABM(%d)\n", lapb->dev, frame->pf); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 121 | if (lapb->mode & LAPB_EXTENDED) { |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 122 | lapb_dbg(1, "(%p) S1 TX DM(%d)\n", |
| 123 | lapb->dev, frame->pf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | lapb_send_control(lapb, LAPB_DM, frame->pf, |
| 125 | LAPB_RESPONSE); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 126 | } else { |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 127 | lapb_dbg(1, "(%p) S1 TX UA(%d)\n", |
| 128 | lapb->dev, frame->pf); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 129 | lapb_send_control(lapb, LAPB_UA, frame->pf, |
| 130 | LAPB_RESPONSE); |
| 131 | } |
| 132 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 134 | case LAPB_SABME: |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 135 | lapb_dbg(1, "(%p) S1 RX SABME(%d)\n", lapb->dev, frame->pf); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 136 | if (lapb->mode & LAPB_EXTENDED) { |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 137 | lapb_dbg(1, "(%p) S1 TX UA(%d)\n", |
| 138 | lapb->dev, frame->pf); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 139 | lapb_send_control(lapb, LAPB_UA, frame->pf, |
| 140 | LAPB_RESPONSE); |
| 141 | } else { |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 142 | lapb_dbg(1, "(%p) S1 TX DM(%d)\n", |
| 143 | lapb->dev, frame->pf); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 144 | lapb_send_control(lapb, LAPB_DM, frame->pf, |
| 145 | LAPB_RESPONSE); |
| 146 | } |
| 147 | break; |
| 148 | |
| 149 | case LAPB_DISC: |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 150 | lapb_dbg(1, "(%p) S1 RX DISC(%d)\n", lapb->dev, frame->pf); |
| 151 | lapb_dbg(1, "(%p) S1 TX DM(%d)\n", lapb->dev, frame->pf); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 152 | lapb_send_control(lapb, LAPB_DM, frame->pf, LAPB_RESPONSE); |
| 153 | break; |
| 154 | |
| 155 | case LAPB_UA: |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 156 | lapb_dbg(1, "(%p) S1 RX UA(%d)\n", lapb->dev, frame->pf); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 157 | if (frame->pf) { |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 158 | lapb_dbg(0, "(%p) S1 -> S3\n", lapb->dev); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 159 | lapb_stop_t1timer(lapb); |
| 160 | lapb_stop_t2timer(lapb); |
| 161 | lapb->state = LAPB_STATE_3; |
| 162 | lapb->condition = 0x00; |
| 163 | lapb->n2count = 0; |
| 164 | lapb->vs = 0; |
| 165 | lapb->vr = 0; |
| 166 | lapb->va = 0; |
| 167 | lapb_connect_confirmation(lapb, LAPB_OK); |
| 168 | } |
| 169 | break; |
| 170 | |
| 171 | case LAPB_DM: |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 172 | lapb_dbg(1, "(%p) S1 RX DM(%d)\n", lapb->dev, frame->pf); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 173 | if (frame->pf) { |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 174 | lapb_dbg(0, "(%p) S1 -> S0\n", lapb->dev); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 175 | lapb_clear_queues(lapb); |
| 176 | lapb->state = LAPB_STATE_0; |
| 177 | lapb_start_t1timer(lapb); |
| 178 | lapb_stop_t2timer(lapb); |
| 179 | lapb_disconnect_indication(lapb, LAPB_REFUSED); |
| 180 | } |
| 181 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | } |
| 183 | |
| 184 | kfree_skb(skb); |
| 185 | } |
| 186 | |
| 187 | /* |
| 188 | * State machine for state 2, Awaiting Release State. |
| 189 | * The handling of the timer(s) is in file lapb_timer.c |
| 190 | */ |
| 191 | static void lapb_state2_machine(struct lapb_cb *lapb, struct sk_buff *skb, |
| 192 | struct lapb_frame *frame) |
| 193 | { |
| 194 | switch (frame->type) { |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 195 | case LAPB_SABM: |
| 196 | case LAPB_SABME: |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 197 | lapb_dbg(1, "(%p) S2 RX {SABM,SABME}(%d)\n", |
| 198 | lapb->dev, frame->pf); |
| 199 | lapb_dbg(1, "(%p) S2 TX DM(%d)\n", lapb->dev, frame->pf); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 200 | lapb_send_control(lapb, LAPB_DM, frame->pf, LAPB_RESPONSE); |
| 201 | break; |
| 202 | |
| 203 | case LAPB_DISC: |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 204 | lapb_dbg(1, "(%p) S2 RX DISC(%d)\n", lapb->dev, frame->pf); |
| 205 | lapb_dbg(1, "(%p) S2 TX UA(%d)\n", lapb->dev, frame->pf); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 206 | lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE); |
| 207 | break; |
| 208 | |
| 209 | case LAPB_UA: |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 210 | lapb_dbg(1, "(%p) S2 RX UA(%d)\n", lapb->dev, frame->pf); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 211 | if (frame->pf) { |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 212 | lapb_dbg(0, "(%p) S2 -> S0\n", lapb->dev); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 213 | lapb->state = LAPB_STATE_0; |
| 214 | lapb_start_t1timer(lapb); |
| 215 | lapb_stop_t2timer(lapb); |
| 216 | lapb_disconnect_confirmation(lapb, LAPB_OK); |
| 217 | } |
| 218 | break; |
| 219 | |
| 220 | case LAPB_DM: |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 221 | lapb_dbg(1, "(%p) S2 RX DM(%d)\n", lapb->dev, frame->pf); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 222 | if (frame->pf) { |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 223 | lapb_dbg(0, "(%p) S2 -> S0\n", lapb->dev); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 224 | lapb->state = LAPB_STATE_0; |
| 225 | lapb_start_t1timer(lapb); |
| 226 | lapb_stop_t2timer(lapb); |
| 227 | lapb_disconnect_confirmation(lapb, LAPB_NOTCONNECTED); |
| 228 | } |
| 229 | break; |
| 230 | |
| 231 | case LAPB_I: |
| 232 | case LAPB_REJ: |
| 233 | case LAPB_RNR: |
| 234 | case LAPB_RR: |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 235 | lapb_dbg(1, "(%p) S2 RX {I,REJ,RNR,RR}(%d)\n", |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 236 | lapb->dev, frame->pf); |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 237 | lapb_dbg(1, "(%p) S2 RX DM(%d)\n", lapb->dev, frame->pf); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 238 | if (frame->pf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | lapb_send_control(lapb, LAPB_DM, frame->pf, |
| 240 | LAPB_RESPONSE); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 241 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | } |
| 243 | |
| 244 | kfree_skb(skb); |
| 245 | } |
| 246 | |
| 247 | /* |
| 248 | * State machine for state 3, Connected State. |
| 249 | * The handling of the timer(s) is in file lapb_timer.c |
| 250 | */ |
| 251 | static void lapb_state3_machine(struct lapb_cb *lapb, struct sk_buff *skb, |
| 252 | struct lapb_frame *frame) |
| 253 | { |
| 254 | int queued = 0; |
| 255 | int modulus = (lapb->mode & LAPB_EXTENDED) ? LAPB_EMODULUS : |
| 256 | LAPB_SMODULUS; |
| 257 | |
| 258 | switch (frame->type) { |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 259 | case LAPB_SABM: |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 260 | lapb_dbg(1, "(%p) S3 RX SABM(%d)\n", lapb->dev, frame->pf); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 261 | if (lapb->mode & LAPB_EXTENDED) { |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 262 | lapb_dbg(1, "(%p) S3 TX DM(%d)\n", |
| 263 | lapb->dev, frame->pf); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 264 | lapb_send_control(lapb, LAPB_DM, frame->pf, |
| 265 | LAPB_RESPONSE); |
| 266 | } else { |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 267 | lapb_dbg(1, "(%p) S3 TX UA(%d)\n", |
| 268 | lapb->dev, frame->pf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | lapb_send_control(lapb, LAPB_UA, frame->pf, |
| 270 | LAPB_RESPONSE); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 271 | lapb_stop_t1timer(lapb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | lapb_stop_t2timer(lapb); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 273 | lapb->condition = 0x00; |
| 274 | lapb->n2count = 0; |
| 275 | lapb->vs = 0; |
| 276 | lapb->vr = 0; |
| 277 | lapb->va = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | lapb_requeue_frames(lapb); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 279 | } |
| 280 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 282 | case LAPB_SABME: |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 283 | lapb_dbg(1, "(%p) S3 RX SABME(%d)\n", lapb->dev, frame->pf); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 284 | if (lapb->mode & LAPB_EXTENDED) { |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 285 | lapb_dbg(1, "(%p) S3 TX UA(%d)\n", |
| 286 | lapb->dev, frame->pf); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 287 | lapb_send_control(lapb, LAPB_UA, frame->pf, |
| 288 | LAPB_RESPONSE); |
| 289 | lapb_stop_t1timer(lapb); |
| 290 | lapb_stop_t2timer(lapb); |
| 291 | lapb->condition = 0x00; |
| 292 | lapb->n2count = 0; |
| 293 | lapb->vs = 0; |
| 294 | lapb->vr = 0; |
| 295 | lapb->va = 0; |
| 296 | lapb_requeue_frames(lapb); |
| 297 | } else { |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 298 | lapb_dbg(1, "(%p) S3 TX DM(%d)\n", |
| 299 | lapb->dev, frame->pf); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 300 | lapb_send_control(lapb, LAPB_DM, frame->pf, |
| 301 | LAPB_RESPONSE); |
| 302 | } |
| 303 | break; |
| 304 | |
| 305 | case LAPB_DISC: |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 306 | lapb_dbg(1, "(%p) S3 RX DISC(%d)\n", lapb->dev, frame->pf); |
| 307 | lapb_dbg(0, "(%p) S3 -> S0\n", lapb->dev); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 308 | lapb_clear_queues(lapb); |
| 309 | lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE); |
| 310 | lapb_start_t1timer(lapb); |
| 311 | lapb_stop_t2timer(lapb); |
| 312 | lapb->state = LAPB_STATE_0; |
| 313 | lapb_disconnect_indication(lapb, LAPB_OK); |
| 314 | break; |
| 315 | |
| 316 | case LAPB_DM: |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 317 | lapb_dbg(1, "(%p) S3 RX DM(%d)\n", lapb->dev, frame->pf); |
| 318 | lapb_dbg(0, "(%p) S3 -> S0\n", lapb->dev); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 319 | lapb_clear_queues(lapb); |
| 320 | lapb->state = LAPB_STATE_0; |
| 321 | lapb_start_t1timer(lapb); |
| 322 | lapb_stop_t2timer(lapb); |
| 323 | lapb_disconnect_indication(lapb, LAPB_NOTCONNECTED); |
| 324 | break; |
| 325 | |
| 326 | case LAPB_RNR: |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 327 | lapb_dbg(1, "(%p) S3 RX RNR(%d) R%d\n", |
| 328 | lapb->dev, frame->pf, frame->nr); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 329 | lapb->condition |= LAPB_PEER_RX_BUSY_CONDITION; |
| 330 | lapb_check_need_response(lapb, frame->cr, frame->pf); |
| 331 | if (lapb_validate_nr(lapb, frame->nr)) { |
| 332 | lapb_check_iframes_acked(lapb, frame->nr); |
| 333 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | lapb->frmr_data = *frame; |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 335 | lapb->frmr_type = LAPB_FRMR_Z; |
| 336 | lapb_transmit_frmr(lapb); |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 337 | lapb_dbg(0, "(%p) S3 -> S4\n", lapb->dev); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 338 | lapb_start_t1timer(lapb); |
| 339 | lapb_stop_t2timer(lapb); |
| 340 | lapb->state = LAPB_STATE_4; |
| 341 | lapb->n2count = 0; |
| 342 | } |
| 343 | break; |
| 344 | |
| 345 | case LAPB_RR: |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 346 | lapb_dbg(1, "(%p) S3 RX RR(%d) R%d\n", |
| 347 | lapb->dev, frame->pf, frame->nr); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 348 | lapb->condition &= ~LAPB_PEER_RX_BUSY_CONDITION; |
| 349 | lapb_check_need_response(lapb, frame->cr, frame->pf); |
| 350 | if (lapb_validate_nr(lapb, frame->nr)) { |
| 351 | lapb_check_iframes_acked(lapb, frame->nr); |
| 352 | } else { |
| 353 | lapb->frmr_data = *frame; |
| 354 | lapb->frmr_type = LAPB_FRMR_Z; |
| 355 | lapb_transmit_frmr(lapb); |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 356 | lapb_dbg(0, "(%p) S3 -> S4\n", lapb->dev); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 357 | lapb_start_t1timer(lapb); |
| 358 | lapb_stop_t2timer(lapb); |
| 359 | lapb->state = LAPB_STATE_4; |
| 360 | lapb->n2count = 0; |
| 361 | } |
| 362 | break; |
| 363 | |
| 364 | case LAPB_REJ: |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 365 | lapb_dbg(1, "(%p) S3 RX REJ(%d) R%d\n", |
| 366 | lapb->dev, frame->pf, frame->nr); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 367 | lapb->condition &= ~LAPB_PEER_RX_BUSY_CONDITION; |
| 368 | lapb_check_need_response(lapb, frame->cr, frame->pf); |
| 369 | if (lapb_validate_nr(lapb, frame->nr)) { |
| 370 | lapb_frames_acked(lapb, frame->nr); |
| 371 | lapb_stop_t1timer(lapb); |
| 372 | lapb->n2count = 0; |
| 373 | lapb_requeue_frames(lapb); |
| 374 | } else { |
| 375 | lapb->frmr_data = *frame; |
| 376 | lapb->frmr_type = LAPB_FRMR_Z; |
| 377 | lapb_transmit_frmr(lapb); |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 378 | lapb_dbg(0, "(%p) S3 -> S4\n", lapb->dev); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 379 | lapb_start_t1timer(lapb); |
| 380 | lapb_stop_t2timer(lapb); |
| 381 | lapb->state = LAPB_STATE_4; |
| 382 | lapb->n2count = 0; |
| 383 | } |
| 384 | break; |
| 385 | |
| 386 | case LAPB_I: |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 387 | lapb_dbg(1, "(%p) S3 RX I(%d) S%d R%d\n", |
| 388 | lapb->dev, frame->pf, frame->ns, frame->nr); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 389 | if (!lapb_validate_nr(lapb, frame->nr)) { |
| 390 | lapb->frmr_data = *frame; |
| 391 | lapb->frmr_type = LAPB_FRMR_Z; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | lapb_transmit_frmr(lapb); |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 393 | lapb_dbg(0, "(%p) S3 -> S4\n", lapb->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | lapb_start_t1timer(lapb); |
| 395 | lapb_stop_t2timer(lapb); |
| 396 | lapb->state = LAPB_STATE_4; |
| 397 | lapb->n2count = 0; |
| 398 | break; |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 399 | } |
| 400 | if (lapb->condition & LAPB_PEER_RX_BUSY_CONDITION) |
| 401 | lapb_frames_acked(lapb, frame->nr); |
| 402 | else |
| 403 | lapb_check_iframes_acked(lapb, frame->nr); |
| 404 | |
| 405 | if (frame->ns == lapb->vr) { |
| 406 | int cn; |
| 407 | cn = lapb_data_indication(lapb, skb); |
| 408 | queued = 1; |
| 409 | /* |
| 410 | * If upper layer has dropped the frame, we |
| 411 | * basically ignore any further protocol |
| 412 | * processing. This will cause the peer |
| 413 | * to re-transmit the frame later like |
| 414 | * a frame lost on the wire. |
| 415 | */ |
| 416 | if (cn == NET_RX_DROP) { |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 417 | pr_debug("rx congestion\n"); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 418 | break; |
| 419 | } |
| 420 | lapb->vr = (lapb->vr + 1) % modulus; |
| 421 | lapb->condition &= ~LAPB_REJECT_CONDITION; |
| 422 | if (frame->pf) |
| 423 | lapb_enquiry_response(lapb); |
| 424 | else { |
| 425 | if (!(lapb->condition & |
| 426 | LAPB_ACK_PENDING_CONDITION)) { |
| 427 | lapb->condition |= LAPB_ACK_PENDING_CONDITION; |
| 428 | lapb_start_t2timer(lapb); |
| 429 | } |
| 430 | } |
| 431 | } else { |
| 432 | if (lapb->condition & LAPB_REJECT_CONDITION) { |
| 433 | if (frame->pf) |
| 434 | lapb_enquiry_response(lapb); |
| 435 | } else { |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 436 | lapb_dbg(1, "(%p) S3 TX REJ(%d) R%d\n", |
| 437 | lapb->dev, frame->pf, lapb->vr); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 438 | lapb->condition |= LAPB_REJECT_CONDITION; |
| 439 | lapb_send_control(lapb, LAPB_REJ, frame->pf, |
| 440 | LAPB_RESPONSE); |
| 441 | lapb->condition &= ~LAPB_ACK_PENDING_CONDITION; |
| 442 | } |
| 443 | } |
| 444 | break; |
| 445 | |
| 446 | case LAPB_FRMR: |
Andy Shevchenko | 0d08df6 | 2016-05-26 14:43:52 +0300 | [diff] [blame] | 447 | lapb_dbg(1, "(%p) S3 RX FRMR(%d) %5ph\n", |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 448 | lapb->dev, frame->pf, |
Andy Shevchenko | 0d08df6 | 2016-05-26 14:43:52 +0300 | [diff] [blame] | 449 | skb->data); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 450 | lapb_establish_data_link(lapb); |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 451 | lapb_dbg(0, "(%p) S3 -> S1\n", lapb->dev); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 452 | lapb_requeue_frames(lapb); |
| 453 | lapb->state = LAPB_STATE_1; |
| 454 | break; |
| 455 | |
| 456 | case LAPB_ILLEGAL: |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 457 | lapb_dbg(1, "(%p) S3 RX ILLEGAL(%d)\n", lapb->dev, frame->pf); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 458 | lapb->frmr_data = *frame; |
| 459 | lapb->frmr_type = LAPB_FRMR_W; |
| 460 | lapb_transmit_frmr(lapb); |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 461 | lapb_dbg(0, "(%p) S3 -> S4\n", lapb->dev); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 462 | lapb_start_t1timer(lapb); |
| 463 | lapb_stop_t2timer(lapb); |
| 464 | lapb->state = LAPB_STATE_4; |
| 465 | lapb->n2count = 0; |
| 466 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | } |
| 468 | |
| 469 | if (!queued) |
| 470 | kfree_skb(skb); |
| 471 | } |
| 472 | |
| 473 | /* |
| 474 | * State machine for state 4, Frame Reject State. |
| 475 | * The handling of the timer(s) is in file lapb_timer.c. |
| 476 | */ |
| 477 | static void lapb_state4_machine(struct lapb_cb *lapb, struct sk_buff *skb, |
| 478 | struct lapb_frame *frame) |
| 479 | { |
| 480 | switch (frame->type) { |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 481 | case LAPB_SABM: |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 482 | lapb_dbg(1, "(%p) S4 RX SABM(%d)\n", lapb->dev, frame->pf); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 483 | if (lapb->mode & LAPB_EXTENDED) { |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 484 | lapb_dbg(1, "(%p) S4 TX DM(%d)\n", |
| 485 | lapb->dev, frame->pf); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 486 | lapb_send_control(lapb, LAPB_DM, frame->pf, |
| 487 | LAPB_RESPONSE); |
| 488 | } else { |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 489 | lapb_dbg(1, "(%p) S4 TX UA(%d)\n", |
| 490 | lapb->dev, frame->pf); |
| 491 | lapb_dbg(0, "(%p) S4 -> S3\n", lapb->dev); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 492 | lapb_send_control(lapb, LAPB_UA, frame->pf, |
| 493 | LAPB_RESPONSE); |
| 494 | lapb_stop_t1timer(lapb); |
| 495 | lapb_stop_t2timer(lapb); |
| 496 | lapb->state = LAPB_STATE_3; |
| 497 | lapb->condition = 0x00; |
| 498 | lapb->n2count = 0; |
| 499 | lapb->vs = 0; |
| 500 | lapb->vr = 0; |
| 501 | lapb->va = 0; |
| 502 | lapb_connect_indication(lapb, LAPB_OK); |
| 503 | } |
| 504 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 506 | case LAPB_SABME: |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 507 | lapb_dbg(1, "(%p) S4 RX SABME(%d)\n", lapb->dev, frame->pf); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 508 | if (lapb->mode & LAPB_EXTENDED) { |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 509 | lapb_dbg(1, "(%p) S4 TX UA(%d)\n", |
| 510 | lapb->dev, frame->pf); |
| 511 | lapb_dbg(0, "(%p) S4 -> S3\n", lapb->dev); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 512 | lapb_send_control(lapb, LAPB_UA, frame->pf, |
| 513 | LAPB_RESPONSE); |
| 514 | lapb_stop_t1timer(lapb); |
| 515 | lapb_stop_t2timer(lapb); |
| 516 | lapb->state = LAPB_STATE_3; |
| 517 | lapb->condition = 0x00; |
| 518 | lapb->n2count = 0; |
| 519 | lapb->vs = 0; |
| 520 | lapb->vr = 0; |
| 521 | lapb->va = 0; |
| 522 | lapb_connect_indication(lapb, LAPB_OK); |
| 523 | } else { |
Joe Perches | a508da6 | 2012-05-17 10:25:49 +0000 | [diff] [blame] | 524 | lapb_dbg(1, "(%p) S4 TX DM(%d)\n", |
| 525 | lapb->dev, frame->pf); |
Joe Perches | fcb261f | 2011-07-01 09:43:09 +0000 | [diff] [blame] | 526 | lapb_send_control(lapb, LAPB_DM, frame->pf, |
| 527 | LAPB_RESPONSE); |
| 528 | } |
| 529 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | } |
| 531 | |
| 532 | kfree_skb(skb); |
| 533 | } |
| 534 | |
| 535 | /* |
| 536 | * Process an incoming LAPB frame |
| 537 | */ |
| 538 | void lapb_data_input(struct lapb_cb *lapb, struct sk_buff *skb) |
| 539 | { |
| 540 | struct lapb_frame frame; |
| 541 | |
| 542 | if (lapb_decode(lapb, skb, &frame) < 0) { |
| 543 | kfree_skb(skb); |
| 544 | return; |
| 545 | } |
| 546 | |
| 547 | switch (lapb->state) { |
| 548 | case LAPB_STATE_0: |
| 549 | lapb_state0_machine(lapb, skb, &frame); break; |
| 550 | case LAPB_STATE_1: |
| 551 | lapb_state1_machine(lapb, skb, &frame); break; |
| 552 | case LAPB_STATE_2: |
| 553 | lapb_state2_machine(lapb, skb, &frame); break; |
| 554 | case LAPB_STATE_3: |
| 555 | lapb_state3_machine(lapb, skb, &frame); break; |
| 556 | case LAPB_STATE_4: |
| 557 | lapb_state4_machine(lapb, skb, &frame); break; |
| 558 | } |
| 559 | |
| 560 | lapb_kick(lapb); |
| 561 | } |