Samuel Ortiz | d646960 | 2011-12-14 16:43:12 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2011 Intel Corporation. All rights reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation; either version 2 of the License, or |
| 7 | * (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the |
| 16 | * Free Software Foundation, Inc., |
| 17 | * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 18 | */ |
| 19 | |
| 20 | #define pr_fmt(fmt) "llcp: %s: " fmt, __func__ |
| 21 | |
| 22 | #include <linux/init.h> |
| 23 | #include <linux/kernel.h> |
| 24 | #include <linux/module.h> |
| 25 | #include <linux/nfc.h> |
| 26 | |
| 27 | #include <net/nfc/nfc.h> |
| 28 | |
| 29 | #include "../nfc.h" |
| 30 | #include "llcp.h" |
| 31 | |
| 32 | static u8 llcp_tlv_length[LLCP_TLV_MAX] = { |
| 33 | 0, |
| 34 | 1, /* VERSION */ |
| 35 | 2, /* MIUX */ |
| 36 | 2, /* WKS */ |
| 37 | 1, /* LTO */ |
| 38 | 1, /* RW */ |
| 39 | 0, /* SN */ |
| 40 | 1, /* OPT */ |
| 41 | 0, /* SDREQ */ |
| 42 | 2, /* SDRES */ |
| 43 | |
| 44 | }; |
| 45 | |
| 46 | static u8 llcp_tlv8(u8 *tlv, u8 type) |
| 47 | { |
| 48 | if (tlv[0] != type || tlv[1] != llcp_tlv_length[tlv[0]]) |
| 49 | return 0; |
| 50 | |
| 51 | return tlv[2]; |
| 52 | } |
| 53 | |
Samuel Ortiz | 76762b7 | 2012-05-14 17:38:54 +0200 | [diff] [blame] | 54 | static u16 llcp_tlv16(u8 *tlv, u8 type) |
Samuel Ortiz | d646960 | 2011-12-14 16:43:12 +0100 | [diff] [blame] | 55 | { |
| 56 | if (tlv[0] != type || tlv[1] != llcp_tlv_length[tlv[0]]) |
| 57 | return 0; |
| 58 | |
| 59 | return be16_to_cpu(*((__be16 *)(tlv + 2))); |
| 60 | } |
| 61 | |
| 62 | |
| 63 | static u8 llcp_tlv_version(u8 *tlv) |
| 64 | { |
| 65 | return llcp_tlv8(tlv, LLCP_TLV_VERSION); |
| 66 | } |
| 67 | |
| 68 | static u16 llcp_tlv_miux(u8 *tlv) |
| 69 | { |
Samuel Ortiz | 76762b7 | 2012-05-14 17:38:54 +0200 | [diff] [blame] | 70 | return llcp_tlv16(tlv, LLCP_TLV_MIUX) & 0x7ff; |
Samuel Ortiz | d646960 | 2011-12-14 16:43:12 +0100 | [diff] [blame] | 71 | } |
| 72 | |
| 73 | static u16 llcp_tlv_wks(u8 *tlv) |
| 74 | { |
| 75 | return llcp_tlv16(tlv, LLCP_TLV_WKS); |
| 76 | } |
| 77 | |
| 78 | static u16 llcp_tlv_lto(u8 *tlv) |
| 79 | { |
| 80 | return llcp_tlv8(tlv, LLCP_TLV_LTO); |
| 81 | } |
| 82 | |
| 83 | static u8 llcp_tlv_opt(u8 *tlv) |
| 84 | { |
| 85 | return llcp_tlv8(tlv, LLCP_TLV_OPT); |
| 86 | } |
| 87 | |
| 88 | static u8 llcp_tlv_rw(u8 *tlv) |
| 89 | { |
| 90 | return llcp_tlv8(tlv, LLCP_TLV_RW) & 0xf; |
| 91 | } |
| 92 | |
| 93 | u8 *nfc_llcp_build_tlv(u8 type, u8 *value, u8 value_length, u8 *tlv_length) |
| 94 | { |
| 95 | u8 *tlv, length; |
| 96 | |
| 97 | pr_debug("type %d\n", type); |
| 98 | |
| 99 | if (type >= LLCP_TLV_MAX) |
| 100 | return NULL; |
| 101 | |
| 102 | length = llcp_tlv_length[type]; |
| 103 | if (length == 0 && value_length == 0) |
| 104 | return NULL; |
Samuel Ortiz | 324b0af | 2012-04-10 19:43:15 +0200 | [diff] [blame] | 105 | else if (length == 0) |
Samuel Ortiz | d646960 | 2011-12-14 16:43:12 +0100 | [diff] [blame] | 106 | length = value_length; |
| 107 | |
| 108 | *tlv_length = 2 + length; |
| 109 | tlv = kzalloc(2 + length, GFP_KERNEL); |
| 110 | if (tlv == NULL) |
| 111 | return tlv; |
| 112 | |
| 113 | tlv[0] = type; |
| 114 | tlv[1] = length; |
| 115 | memcpy(tlv + 2, value, length); |
| 116 | |
| 117 | return tlv; |
| 118 | } |
| 119 | |
Thierry Escande | e0ae7ba | 2013-02-15 10:43:05 +0100 | [diff] [blame^] | 120 | struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdres_tlv(u8 tid, u8 sap) |
| 121 | { |
| 122 | struct nfc_llcp_sdp_tlv *sdres; |
| 123 | u8 value[2]; |
| 124 | |
| 125 | sdres = kzalloc(sizeof(struct nfc_llcp_sdp_tlv), GFP_KERNEL); |
| 126 | if (sdres == NULL) |
| 127 | return NULL; |
| 128 | |
| 129 | value[0] = tid; |
| 130 | value[1] = sap; |
| 131 | |
| 132 | sdres->tlv = nfc_llcp_build_tlv(LLCP_TLV_SDRES, value, 2, |
| 133 | &sdres->tlv_len); |
| 134 | if (sdres->tlv == NULL) { |
| 135 | kfree(sdres); |
| 136 | return NULL; |
| 137 | } |
| 138 | |
| 139 | sdres->tid = tid; |
| 140 | sdres->sap = sap; |
| 141 | |
| 142 | INIT_HLIST_NODE(&sdres->node); |
| 143 | |
| 144 | return sdres; |
| 145 | } |
| 146 | |
| 147 | void nfc_llcp_free_sdp_tlv(struct nfc_llcp_sdp_tlv *sdp) |
| 148 | { |
| 149 | kfree(sdp->tlv); |
| 150 | kfree(sdp); |
| 151 | } |
| 152 | |
Samuel Ortiz | 7a06e58 | 2012-05-07 22:03:34 +0200 | [diff] [blame] | 153 | int nfc_llcp_parse_gb_tlv(struct nfc_llcp_local *local, |
| 154 | u8 *tlv_array, u16 tlv_array_len) |
Samuel Ortiz | d646960 | 2011-12-14 16:43:12 +0100 | [diff] [blame] | 155 | { |
| 156 | u8 *tlv = tlv_array, type, length, offset = 0; |
| 157 | |
| 158 | pr_debug("TLV array length %d\n", tlv_array_len); |
| 159 | |
| 160 | if (local == NULL) |
| 161 | return -ENODEV; |
| 162 | |
| 163 | while (offset < tlv_array_len) { |
| 164 | type = tlv[0]; |
| 165 | length = tlv[1]; |
| 166 | |
| 167 | pr_debug("type 0x%x length %d\n", type, length); |
| 168 | |
| 169 | switch (type) { |
| 170 | case LLCP_TLV_VERSION: |
| 171 | local->remote_version = llcp_tlv_version(tlv); |
| 172 | break; |
| 173 | case LLCP_TLV_MIUX: |
| 174 | local->remote_miu = llcp_tlv_miux(tlv) + 128; |
| 175 | break; |
| 176 | case LLCP_TLV_WKS: |
| 177 | local->remote_wks = llcp_tlv_wks(tlv); |
| 178 | break; |
| 179 | case LLCP_TLV_LTO: |
| 180 | local->remote_lto = llcp_tlv_lto(tlv) * 10; |
| 181 | break; |
| 182 | case LLCP_TLV_OPT: |
| 183 | local->remote_opt = llcp_tlv_opt(tlv); |
| 184 | break; |
Samuel Ortiz | 7a06e58 | 2012-05-07 22:03:34 +0200 | [diff] [blame] | 185 | default: |
| 186 | pr_err("Invalid gt tlv value 0x%x\n", type); |
| 187 | break; |
| 188 | } |
| 189 | |
| 190 | offset += length + 2; |
| 191 | tlv += length + 2; |
| 192 | } |
| 193 | |
| 194 | pr_debug("version 0x%x miu %d lto %d opt 0x%x wks 0x%x\n", |
| 195 | local->remote_version, local->remote_miu, |
| 196 | local->remote_lto, local->remote_opt, |
| 197 | local->remote_wks); |
| 198 | |
| 199 | return 0; |
| 200 | } |
| 201 | |
| 202 | int nfc_llcp_parse_connection_tlv(struct nfc_llcp_sock *sock, |
| 203 | u8 *tlv_array, u16 tlv_array_len) |
| 204 | { |
| 205 | u8 *tlv = tlv_array, type, length, offset = 0; |
| 206 | |
| 207 | pr_debug("TLV array length %d\n", tlv_array_len); |
| 208 | |
| 209 | if (sock == NULL) |
| 210 | return -ENOTCONN; |
| 211 | |
| 212 | while (offset < tlv_array_len) { |
| 213 | type = tlv[0]; |
| 214 | length = tlv[1]; |
| 215 | |
| 216 | pr_debug("type 0x%x length %d\n", type, length); |
| 217 | |
| 218 | switch (type) { |
Samuel Ortiz | 93d7e49 | 2012-05-14 17:37:32 +0200 | [diff] [blame] | 219 | case LLCP_TLV_MIUX: |
Samuel Ortiz | e4306be | 2013-02-22 01:12:28 +0100 | [diff] [blame] | 220 | sock->remote_miu = llcp_tlv_miux(tlv) + 128; |
Samuel Ortiz | 93d7e49 | 2012-05-14 17:37:32 +0200 | [diff] [blame] | 221 | break; |
Samuel Ortiz | d646960 | 2011-12-14 16:43:12 +0100 | [diff] [blame] | 222 | case LLCP_TLV_RW: |
Samuel Ortiz | e4306be | 2013-02-22 01:12:28 +0100 | [diff] [blame] | 223 | sock->remote_rw = llcp_tlv_rw(tlv); |
Samuel Ortiz | d646960 | 2011-12-14 16:43:12 +0100 | [diff] [blame] | 224 | break; |
Samuel Ortiz | 9dda50f | 2012-03-05 01:03:49 +0100 | [diff] [blame] | 225 | case LLCP_TLV_SN: |
| 226 | break; |
Samuel Ortiz | d646960 | 2011-12-14 16:43:12 +0100 | [diff] [blame] | 227 | default: |
| 228 | pr_err("Invalid gt tlv value 0x%x\n", type); |
| 229 | break; |
| 230 | } |
| 231 | |
| 232 | offset += length + 2; |
| 233 | tlv += length + 2; |
| 234 | } |
| 235 | |
Samuel Ortiz | e4306be | 2013-02-22 01:12:28 +0100 | [diff] [blame] | 236 | pr_debug("sock %p rw %d miu %d\n", sock, |
| 237 | sock->remote_rw, sock->remote_miu); |
Samuel Ortiz | d646960 | 2011-12-14 16:43:12 +0100 | [diff] [blame] | 238 | |
| 239 | return 0; |
| 240 | } |
| 241 | |
| 242 | static struct sk_buff *llcp_add_header(struct sk_buff *pdu, |
Samuel Ortiz | 427a2eb | 2012-03-05 01:03:52 +0100 | [diff] [blame] | 243 | u8 dsap, u8 ssap, u8 ptype) |
Samuel Ortiz | d646960 | 2011-12-14 16:43:12 +0100 | [diff] [blame] | 244 | { |
| 245 | u8 header[2]; |
| 246 | |
| 247 | pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap); |
| 248 | |
| 249 | header[0] = (u8)((dsap << 2) | (ptype >> 2)); |
| 250 | header[1] = (u8)((ptype << 6) | ssap); |
| 251 | |
| 252 | pr_debug("header 0x%x 0x%x\n", header[0], header[1]); |
| 253 | |
| 254 | memcpy(skb_put(pdu, LLCP_HEADER_SIZE), header, LLCP_HEADER_SIZE); |
| 255 | |
| 256 | return pdu; |
| 257 | } |
| 258 | |
Samuel Ortiz | 427a2eb | 2012-03-05 01:03:52 +0100 | [diff] [blame] | 259 | static struct sk_buff *llcp_add_tlv(struct sk_buff *pdu, u8 *tlv, |
| 260 | u8 tlv_length) |
Samuel Ortiz | d646960 | 2011-12-14 16:43:12 +0100 | [diff] [blame] | 261 | { |
| 262 | /* XXX Add an skb length check */ |
| 263 | |
| 264 | if (tlv == NULL) |
| 265 | return NULL; |
| 266 | |
| 267 | memcpy(skb_put(pdu, tlv_length), tlv, tlv_length); |
| 268 | |
| 269 | return pdu; |
| 270 | } |
| 271 | |
| 272 | static struct sk_buff *llcp_allocate_pdu(struct nfc_llcp_sock *sock, |
Samuel Ortiz | 427a2eb | 2012-03-05 01:03:52 +0100 | [diff] [blame] | 273 | u8 cmd, u16 size) |
Samuel Ortiz | d646960 | 2011-12-14 16:43:12 +0100 | [diff] [blame] | 274 | { |
| 275 | struct sk_buff *skb; |
| 276 | int err; |
| 277 | |
| 278 | if (sock->ssap == 0) |
| 279 | return NULL; |
| 280 | |
| 281 | skb = nfc_alloc_send_skb(sock->dev, &sock->sk, MSG_DONTWAIT, |
Samuel Ortiz | 427a2eb | 2012-03-05 01:03:52 +0100 | [diff] [blame] | 282 | size + LLCP_HEADER_SIZE, &err); |
Samuel Ortiz | d646960 | 2011-12-14 16:43:12 +0100 | [diff] [blame] | 283 | if (skb == NULL) { |
| 284 | pr_err("Could not allocate PDU\n"); |
| 285 | return NULL; |
| 286 | } |
| 287 | |
| 288 | skb = llcp_add_header(skb, sock->dsap, sock->ssap, cmd); |
| 289 | |
| 290 | return skb; |
| 291 | } |
| 292 | |
| 293 | int nfc_llcp_disconnect(struct nfc_llcp_sock *sock) |
| 294 | { |
| 295 | struct sk_buff *skb; |
| 296 | struct nfc_dev *dev; |
| 297 | struct nfc_llcp_local *local; |
Samuel Ortiz | d646960 | 2011-12-14 16:43:12 +0100 | [diff] [blame] | 298 | |
| 299 | pr_debug("Sending DISC\n"); |
| 300 | |
| 301 | local = sock->local; |
| 302 | if (local == NULL) |
| 303 | return -ENODEV; |
| 304 | |
| 305 | dev = sock->dev; |
| 306 | if (dev == NULL) |
| 307 | return -ENODEV; |
| 308 | |
Samuel Ortiz | 9222390 | 2012-10-05 01:09:07 +0200 | [diff] [blame] | 309 | skb = llcp_allocate_pdu(sock, LLCP_PDU_DISC, 0); |
Samuel Ortiz | d646960 | 2011-12-14 16:43:12 +0100 | [diff] [blame] | 310 | if (skb == NULL) |
| 311 | return -ENOMEM; |
| 312 | |
Samuel Ortiz | d646960 | 2011-12-14 16:43:12 +0100 | [diff] [blame] | 313 | skb_queue_tail(&local->tx_queue, skb); |
| 314 | |
| 315 | return 0; |
| 316 | } |
| 317 | |
| 318 | int nfc_llcp_send_symm(struct nfc_dev *dev) |
| 319 | { |
| 320 | struct sk_buff *skb; |
| 321 | struct nfc_llcp_local *local; |
| 322 | u16 size = 0; |
| 323 | |
| 324 | pr_debug("Sending SYMM\n"); |
| 325 | |
| 326 | local = nfc_llcp_find_local(dev); |
| 327 | if (local == NULL) |
| 328 | return -ENODEV; |
| 329 | |
| 330 | size += LLCP_HEADER_SIZE; |
| 331 | size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE; |
| 332 | |
| 333 | skb = alloc_skb(size, GFP_KERNEL); |
| 334 | if (skb == NULL) |
| 335 | return -ENOMEM; |
| 336 | |
| 337 | skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE); |
| 338 | |
| 339 | skb = llcp_add_header(skb, 0, 0, LLCP_PDU_SYMM); |
| 340 | |
Thierry Escande | 2c2d45b | 2012-11-27 15:44:24 +0100 | [diff] [blame] | 341 | __net_timestamp(skb); |
| 342 | |
Thierry Escande | 4463523b | 2012-09-26 18:16:44 +0200 | [diff] [blame] | 343 | nfc_llcp_send_to_raw_sock(local, skb, NFC_LLCP_DIRECTION_TX); |
| 344 | |
Samuel Ortiz | d646960 | 2011-12-14 16:43:12 +0100 | [diff] [blame] | 345 | return nfc_data_exchange(dev, local->target_idx, skb, |
Samuel Ortiz | 427a2eb | 2012-03-05 01:03:52 +0100 | [diff] [blame] | 346 | nfc_llcp_recv, local); |
Samuel Ortiz | d646960 | 2011-12-14 16:43:12 +0100 | [diff] [blame] | 347 | } |
| 348 | |
| 349 | int nfc_llcp_send_connect(struct nfc_llcp_sock *sock) |
| 350 | { |
| 351 | struct nfc_llcp_local *local; |
| 352 | struct sk_buff *skb; |
| 353 | u8 *service_name_tlv = NULL, service_name_tlv_length; |
Samuel Ortiz | eda21f1 | 2012-03-05 01:03:43 +0100 | [diff] [blame] | 354 | u8 *miux_tlv = NULL, miux_tlv_length; |
Samuel Ortiz | 06d44f8 | 2013-02-22 11:38:05 +0100 | [diff] [blame] | 355 | u8 *rw_tlv = NULL, rw_tlv_length, rw; |
Samuel Ortiz | d646960 | 2011-12-14 16:43:12 +0100 | [diff] [blame] | 356 | int err; |
Samuel Ortiz | 06d44f8 | 2013-02-22 11:38:05 +0100 | [diff] [blame] | 357 | u16 size = 0, miux; |
Samuel Ortiz | d646960 | 2011-12-14 16:43:12 +0100 | [diff] [blame] | 358 | |
| 359 | pr_debug("Sending CONNECT\n"); |
| 360 | |
| 361 | local = sock->local; |
| 362 | if (local == NULL) |
| 363 | return -ENODEV; |
| 364 | |
| 365 | if (sock->service_name != NULL) { |
| 366 | service_name_tlv = nfc_llcp_build_tlv(LLCP_TLV_SN, |
Samuel Ortiz | 427a2eb | 2012-03-05 01:03:52 +0100 | [diff] [blame] | 367 | sock->service_name, |
| 368 | sock->service_name_len, |
| 369 | &service_name_tlv_length); |
Samuel Ortiz | d646960 | 2011-12-14 16:43:12 +0100 | [diff] [blame] | 370 | size += service_name_tlv_length; |
| 371 | } |
| 372 | |
Samuel Ortiz | 06d44f8 | 2013-02-22 11:38:05 +0100 | [diff] [blame] | 373 | /* If the socket parameters are not set, use the local ones */ |
| 374 | miux = sock->miux > LLCP_MAX_MIUX ? local->miux : sock->miux; |
| 375 | rw = sock->rw > LLCP_MAX_RW ? local->rw : sock->rw; |
| 376 | |
| 377 | miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0, |
Samuel Ortiz | 427a2eb | 2012-03-05 01:03:52 +0100 | [diff] [blame] | 378 | &miux_tlv_length); |
Samuel Ortiz | eda21f1 | 2012-03-05 01:03:43 +0100 | [diff] [blame] | 379 | size += miux_tlv_length; |
| 380 | |
Samuel Ortiz | 06d44f8 | 2013-02-22 11:38:05 +0100 | [diff] [blame] | 381 | rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length); |
Samuel Ortiz | eda21f1 | 2012-03-05 01:03:43 +0100 | [diff] [blame] | 382 | size += rw_tlv_length; |
| 383 | |
Samuel Ortiz | d646960 | 2011-12-14 16:43:12 +0100 | [diff] [blame] | 384 | pr_debug("SKB size %d SN length %zu\n", size, sock->service_name_len); |
| 385 | |
| 386 | skb = llcp_allocate_pdu(sock, LLCP_PDU_CONNECT, size); |
| 387 | if (skb == NULL) { |
| 388 | err = -ENOMEM; |
| 389 | goto error_tlv; |
| 390 | } |
| 391 | |
| 392 | if (service_name_tlv != NULL) |
| 393 | skb = llcp_add_tlv(skb, service_name_tlv, |
Samuel Ortiz | 427a2eb | 2012-03-05 01:03:52 +0100 | [diff] [blame] | 394 | service_name_tlv_length); |
Samuel Ortiz | d646960 | 2011-12-14 16:43:12 +0100 | [diff] [blame] | 395 | |
Samuel Ortiz | eda21f1 | 2012-03-05 01:03:43 +0100 | [diff] [blame] | 396 | skb = llcp_add_tlv(skb, miux_tlv, miux_tlv_length); |
| 397 | skb = llcp_add_tlv(skb, rw_tlv, rw_tlv_length); |
| 398 | |
Samuel Ortiz | d646960 | 2011-12-14 16:43:12 +0100 | [diff] [blame] | 399 | skb_queue_tail(&local->tx_queue, skb); |
| 400 | |
| 401 | return 0; |
| 402 | |
| 403 | error_tlv: |
| 404 | pr_err("error %d\n", err); |
| 405 | |
| 406 | kfree(service_name_tlv); |
Samuel Ortiz | eda21f1 | 2012-03-05 01:03:43 +0100 | [diff] [blame] | 407 | kfree(miux_tlv); |
| 408 | kfree(rw_tlv); |
Samuel Ortiz | d646960 | 2011-12-14 16:43:12 +0100 | [diff] [blame] | 409 | |
| 410 | return err; |
| 411 | } |
| 412 | |
| 413 | int nfc_llcp_send_cc(struct nfc_llcp_sock *sock) |
| 414 | { |
| 415 | struct nfc_llcp_local *local; |
| 416 | struct sk_buff *skb; |
Samuel Ortiz | eda21f1 | 2012-03-05 01:03:43 +0100 | [diff] [blame] | 417 | u8 *miux_tlv = NULL, miux_tlv_length; |
Samuel Ortiz | 06d44f8 | 2013-02-22 11:38:05 +0100 | [diff] [blame] | 418 | u8 *rw_tlv = NULL, rw_tlv_length, rw; |
Samuel Ortiz | eda21f1 | 2012-03-05 01:03:43 +0100 | [diff] [blame] | 419 | int err; |
Samuel Ortiz | 06d44f8 | 2013-02-22 11:38:05 +0100 | [diff] [blame] | 420 | u16 size = 0, miux; |
Samuel Ortiz | d646960 | 2011-12-14 16:43:12 +0100 | [diff] [blame] | 421 | |
| 422 | pr_debug("Sending CC\n"); |
| 423 | |
| 424 | local = sock->local; |
| 425 | if (local == NULL) |
| 426 | return -ENODEV; |
| 427 | |
Samuel Ortiz | 06d44f8 | 2013-02-22 11:38:05 +0100 | [diff] [blame] | 428 | /* If the socket parameters are not set, use the local ones */ |
| 429 | miux = sock->miux > LLCP_MAX_MIUX ? local->miux : sock->miux; |
| 430 | rw = sock->rw > LLCP_MAX_RW ? local->rw : sock->rw; |
| 431 | |
| 432 | miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0, |
Samuel Ortiz | 427a2eb | 2012-03-05 01:03:52 +0100 | [diff] [blame] | 433 | &miux_tlv_length); |
Samuel Ortiz | eda21f1 | 2012-03-05 01:03:43 +0100 | [diff] [blame] | 434 | size += miux_tlv_length; |
| 435 | |
Samuel Ortiz | 06d44f8 | 2013-02-22 11:38:05 +0100 | [diff] [blame] | 436 | rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length); |
Samuel Ortiz | eda21f1 | 2012-03-05 01:03:43 +0100 | [diff] [blame] | 437 | size += rw_tlv_length; |
| 438 | |
| 439 | skb = llcp_allocate_pdu(sock, LLCP_PDU_CC, size); |
| 440 | if (skb == NULL) { |
| 441 | err = -ENOMEM; |
| 442 | goto error_tlv; |
| 443 | } |
| 444 | |
| 445 | skb = llcp_add_tlv(skb, miux_tlv, miux_tlv_length); |
| 446 | skb = llcp_add_tlv(skb, rw_tlv, rw_tlv_length); |
Samuel Ortiz | d646960 | 2011-12-14 16:43:12 +0100 | [diff] [blame] | 447 | |
| 448 | skb_queue_tail(&local->tx_queue, skb); |
| 449 | |
| 450 | return 0; |
Samuel Ortiz | eda21f1 | 2012-03-05 01:03:43 +0100 | [diff] [blame] | 451 | |
| 452 | error_tlv: |
| 453 | pr_err("error %d\n", err); |
| 454 | |
| 455 | kfree(miux_tlv); |
| 456 | kfree(rw_tlv); |
| 457 | |
| 458 | return err; |
Samuel Ortiz | d646960 | 2011-12-14 16:43:12 +0100 | [diff] [blame] | 459 | } |
| 460 | |
Thierry Escande | e0ae7ba | 2013-02-15 10:43:05 +0100 | [diff] [blame^] | 461 | static struct sk_buff *nfc_llcp_allocate_snl(struct nfc_llcp_local *local, |
| 462 | size_t tlv_length) |
Samuel Ortiz | c43bb03 | 2012-10-05 01:13:24 +0200 | [diff] [blame] | 463 | { |
| 464 | struct sk_buff *skb; |
| 465 | struct nfc_dev *dev; |
Samuel Ortiz | c43bb03 | 2012-10-05 01:13:24 +0200 | [diff] [blame] | 466 | u16 size = 0; |
| 467 | |
Samuel Ortiz | c43bb03 | 2012-10-05 01:13:24 +0200 | [diff] [blame] | 468 | if (local == NULL) |
Thierry Escande | e0ae7ba | 2013-02-15 10:43:05 +0100 | [diff] [blame^] | 469 | return ERR_PTR(-ENODEV); |
Samuel Ortiz | c43bb03 | 2012-10-05 01:13:24 +0200 | [diff] [blame] | 470 | |
| 471 | dev = local->dev; |
| 472 | if (dev == NULL) |
Thierry Escande | e0ae7ba | 2013-02-15 10:43:05 +0100 | [diff] [blame^] | 473 | return ERR_PTR(-ENODEV); |
Samuel Ortiz | c43bb03 | 2012-10-05 01:13:24 +0200 | [diff] [blame] | 474 | |
| 475 | size += LLCP_HEADER_SIZE; |
| 476 | size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE; |
Thierry Escande | e0ae7ba | 2013-02-15 10:43:05 +0100 | [diff] [blame^] | 477 | size += tlv_length; |
Samuel Ortiz | c43bb03 | 2012-10-05 01:13:24 +0200 | [diff] [blame] | 478 | |
| 479 | skb = alloc_skb(size, GFP_KERNEL); |
Thierry Escande | e0ae7ba | 2013-02-15 10:43:05 +0100 | [diff] [blame^] | 480 | if (skb == NULL) |
| 481 | return ERR_PTR(-ENOMEM); |
Samuel Ortiz | c43bb03 | 2012-10-05 01:13:24 +0200 | [diff] [blame] | 482 | |
| 483 | skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE); |
| 484 | |
| 485 | skb = llcp_add_header(skb, LLCP_SAP_SDP, LLCP_SAP_SDP, LLCP_PDU_SNL); |
| 486 | |
Thierry Escande | e0ae7ba | 2013-02-15 10:43:05 +0100 | [diff] [blame^] | 487 | return skb; |
| 488 | } |
| 489 | |
| 490 | int nfc_llcp_send_snl_sdres(struct nfc_llcp_local *local, |
| 491 | struct hlist_head *tlv_list, size_t tlvs_len) |
| 492 | { |
| 493 | struct nfc_llcp_sdp_tlv *sdp; |
| 494 | struct hlist_node *n; |
| 495 | struct sk_buff *skb; |
| 496 | |
| 497 | skb = nfc_llcp_allocate_snl(local, tlvs_len); |
| 498 | if (IS_ERR(skb)) |
| 499 | return PTR_ERR(skb); |
| 500 | |
| 501 | hlist_for_each_entry_safe(sdp, n, tlv_list, node) { |
| 502 | memcpy(skb_put(skb, sdp->tlv_len), sdp->tlv, sdp->tlv_len); |
| 503 | |
| 504 | hlist_del(&sdp->node); |
| 505 | |
| 506 | nfc_llcp_free_sdp_tlv(sdp); |
| 507 | } |
Samuel Ortiz | c43bb03 | 2012-10-05 01:13:24 +0200 | [diff] [blame] | 508 | |
| 509 | skb_queue_tail(&local->tx_queue, skb); |
| 510 | |
Samuel Ortiz | c43bb03 | 2012-10-05 01:13:24 +0200 | [diff] [blame] | 511 | return 0; |
| 512 | } |
| 513 | |
Samuel Ortiz | d646960 | 2011-12-14 16:43:12 +0100 | [diff] [blame] | 514 | int nfc_llcp_send_dm(struct nfc_llcp_local *local, u8 ssap, u8 dsap, u8 reason) |
| 515 | { |
| 516 | struct sk_buff *skb; |
| 517 | struct nfc_dev *dev; |
| 518 | u16 size = 1; /* Reason code */ |
| 519 | |
| 520 | pr_debug("Sending DM reason 0x%x\n", reason); |
| 521 | |
| 522 | if (local == NULL) |
| 523 | return -ENODEV; |
| 524 | |
| 525 | dev = local->dev; |
| 526 | if (dev == NULL) |
| 527 | return -ENODEV; |
| 528 | |
| 529 | size += LLCP_HEADER_SIZE; |
| 530 | size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE; |
| 531 | |
| 532 | skb = alloc_skb(size, GFP_KERNEL); |
| 533 | if (skb == NULL) |
| 534 | return -ENOMEM; |
| 535 | |
| 536 | skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE); |
| 537 | |
Samuel Ortiz | ffc2931 | 2012-04-10 19:43:16 +0200 | [diff] [blame] | 538 | skb = llcp_add_header(skb, dsap, ssap, LLCP_PDU_DM); |
Samuel Ortiz | d646960 | 2011-12-14 16:43:12 +0100 | [diff] [blame] | 539 | |
| 540 | memcpy(skb_put(skb, 1), &reason, 1); |
| 541 | |
| 542 | skb_queue_head(&local->tx_queue, skb); |
| 543 | |
| 544 | return 0; |
| 545 | } |
| 546 | |
| 547 | int nfc_llcp_send_disconnect(struct nfc_llcp_sock *sock) |
| 548 | { |
| 549 | struct sk_buff *skb; |
| 550 | struct nfc_llcp_local *local; |
| 551 | |
| 552 | pr_debug("Send DISC\n"); |
| 553 | |
| 554 | local = sock->local; |
| 555 | if (local == NULL) |
| 556 | return -ENODEV; |
| 557 | |
| 558 | skb = llcp_allocate_pdu(sock, LLCP_PDU_DISC, 0); |
| 559 | if (skb == NULL) |
| 560 | return -ENOMEM; |
| 561 | |
| 562 | skb_queue_head(&local->tx_queue, skb); |
| 563 | |
| 564 | return 0; |
| 565 | } |
Samuel Ortiz | 53a0ac2 | 2012-03-05 01:03:37 +0100 | [diff] [blame] | 566 | |
| 567 | int nfc_llcp_send_i_frame(struct nfc_llcp_sock *sock, |
Samuel Ortiz | 427a2eb | 2012-03-05 01:03:52 +0100 | [diff] [blame] | 568 | struct msghdr *msg, size_t len) |
Samuel Ortiz | 53a0ac2 | 2012-03-05 01:03:37 +0100 | [diff] [blame] | 569 | { |
| 570 | struct sk_buff *pdu; |
Samuel Ortiz | e65b0f4 | 2012-03-05 01:03:44 +0100 | [diff] [blame] | 571 | struct sock *sk = &sock->sk; |
| 572 | struct nfc_llcp_local *local; |
| 573 | size_t frag_len = 0, remaining_len; |
| 574 | u8 *msg_data, *msg_ptr; |
Samuel Ortiz | 53a0ac2 | 2012-03-05 01:03:37 +0100 | [diff] [blame] | 575 | |
Samuel Ortiz | e65b0f4 | 2012-03-05 01:03:44 +0100 | [diff] [blame] | 576 | pr_debug("Send I frame len %zd\n", len); |
Samuel Ortiz | 53a0ac2 | 2012-03-05 01:03:37 +0100 | [diff] [blame] | 577 | |
Samuel Ortiz | e65b0f4 | 2012-03-05 01:03:44 +0100 | [diff] [blame] | 578 | local = sock->local; |
| 579 | if (local == NULL) |
| 580 | return -ENODEV; |
| 581 | |
Samuel Ortiz | dd2bf43 | 2012-11-01 23:33:00 +0100 | [diff] [blame] | 582 | /* Remote is ready but has not acknowledged our frames */ |
| 583 | if((sock->remote_ready && |
Samuel Ortiz | e4306be | 2013-02-22 01:12:28 +0100 | [diff] [blame] | 584 | skb_queue_len(&sock->tx_pending_queue) >= sock->remote_rw && |
| 585 | skb_queue_len(&sock->tx_queue) >= 2 * sock->remote_rw)) { |
Samuel Ortiz | dd2bf43 | 2012-11-01 23:33:00 +0100 | [diff] [blame] | 586 | pr_err("Pending queue is full %d frames\n", |
| 587 | skb_queue_len(&sock->tx_pending_queue)); |
| 588 | return -ENOBUFS; |
| 589 | } |
| 590 | |
| 591 | /* Remote is not ready and we've been queueing enough frames */ |
| 592 | if ((!sock->remote_ready && |
Samuel Ortiz | e4306be | 2013-02-22 01:12:28 +0100 | [diff] [blame] | 593 | skb_queue_len(&sock->tx_queue) >= 2 * sock->remote_rw)) { |
Samuel Ortiz | dd2bf43 | 2012-11-01 23:33:00 +0100 | [diff] [blame] | 594 | pr_err("Tx queue is full %d frames\n", |
| 595 | skb_queue_len(&sock->tx_queue)); |
| 596 | return -ENOBUFS; |
| 597 | } |
| 598 | |
Samuel Ortiz | e65b0f4 | 2012-03-05 01:03:44 +0100 | [diff] [blame] | 599 | msg_data = kzalloc(len, GFP_KERNEL); |
| 600 | if (msg_data == NULL) |
Samuel Ortiz | 53a0ac2 | 2012-03-05 01:03:37 +0100 | [diff] [blame] | 601 | return -ENOMEM; |
| 602 | |
Samuel Ortiz | e65b0f4 | 2012-03-05 01:03:44 +0100 | [diff] [blame] | 603 | if (memcpy_fromiovec(msg_data, msg->msg_iov, len)) { |
Samuel Ortiz | 427a2eb | 2012-03-05 01:03:52 +0100 | [diff] [blame] | 604 | kfree(msg_data); |
| 605 | return -EFAULT; |
Samuel Ortiz | 53a0ac2 | 2012-03-05 01:03:37 +0100 | [diff] [blame] | 606 | } |
| 607 | |
Samuel Ortiz | e65b0f4 | 2012-03-05 01:03:44 +0100 | [diff] [blame] | 608 | remaining_len = len; |
| 609 | msg_ptr = msg_data; |
Samuel Ortiz | 53a0ac2 | 2012-03-05 01:03:37 +0100 | [diff] [blame] | 610 | |
Samuel Ortiz | e65b0f4 | 2012-03-05 01:03:44 +0100 | [diff] [blame] | 611 | while (remaining_len > 0) { |
Samuel Ortiz | 53a0ac2 | 2012-03-05 01:03:37 +0100 | [diff] [blame] | 612 | |
Samuel Ortiz | e4306be | 2013-02-22 01:12:28 +0100 | [diff] [blame] | 613 | frag_len = min_t(size_t, sock->remote_miu, remaining_len); |
Samuel Ortiz | 53a0ac2 | 2012-03-05 01:03:37 +0100 | [diff] [blame] | 614 | |
Samuel Ortiz | e65b0f4 | 2012-03-05 01:03:44 +0100 | [diff] [blame] | 615 | pr_debug("Fragment %zd bytes remaining %zd", |
| 616 | frag_len, remaining_len); |
| 617 | |
| 618 | pdu = llcp_allocate_pdu(sock, LLCP_PDU_I, |
| 619 | frag_len + LLCP_SEQUENCE_SIZE); |
| 620 | if (pdu == NULL) |
| 621 | return -ENOMEM; |
| 622 | |
| 623 | skb_put(pdu, LLCP_SEQUENCE_SIZE); |
| 624 | |
| 625 | memcpy(skb_put(pdu, frag_len), msg_ptr, frag_len); |
| 626 | |
Samuel Ortiz | bdbc59b | 2012-05-10 19:45:52 +0200 | [diff] [blame] | 627 | skb_queue_tail(&sock->tx_queue, pdu); |
Samuel Ortiz | e65b0f4 | 2012-03-05 01:03:44 +0100 | [diff] [blame] | 628 | |
| 629 | lock_sock(sk); |
| 630 | |
| 631 | nfc_llcp_queue_i_frames(sock); |
| 632 | |
| 633 | release_sock(sk); |
| 634 | |
| 635 | remaining_len -= frag_len; |
Samuel Ortiz | b4838d1 | 2012-04-10 19:43:03 +0200 | [diff] [blame] | 636 | msg_ptr += frag_len; |
Samuel Ortiz | e65b0f4 | 2012-03-05 01:03:44 +0100 | [diff] [blame] | 637 | } |
| 638 | |
| 639 | kfree(msg_data); |
Samuel Ortiz | 53a0ac2 | 2012-03-05 01:03:37 +0100 | [diff] [blame] | 640 | |
Samuel Ortiz | 43472ff | 2012-05-07 12:31:21 +0200 | [diff] [blame] | 641 | return len; |
Samuel Ortiz | 53a0ac2 | 2012-03-05 01:03:37 +0100 | [diff] [blame] | 642 | } |
Samuel Ortiz | d094afa | 2012-03-05 01:03:42 +0100 | [diff] [blame] | 643 | |
Samuel Ortiz | 94f418a | 2012-10-16 15:01:40 +0200 | [diff] [blame] | 644 | int nfc_llcp_send_ui_frame(struct nfc_llcp_sock *sock, u8 ssap, u8 dsap, |
| 645 | struct msghdr *msg, size_t len) |
| 646 | { |
| 647 | struct sk_buff *pdu; |
| 648 | struct nfc_llcp_local *local; |
| 649 | size_t frag_len = 0, remaining_len; |
Samuel Ortiz | 6e950fd | 2012-10-29 14:02:17 +0100 | [diff] [blame] | 650 | u8 *msg_ptr, *msg_data; |
Samuel Ortiz | 94f418a | 2012-10-16 15:01:40 +0200 | [diff] [blame] | 651 | int err; |
| 652 | |
| 653 | pr_debug("Send UI frame len %zd\n", len); |
| 654 | |
| 655 | local = sock->local; |
| 656 | if (local == NULL) |
| 657 | return -ENODEV; |
| 658 | |
Samuel Ortiz | 6e950fd | 2012-10-29 14:02:17 +0100 | [diff] [blame] | 659 | msg_data = kzalloc(len, GFP_KERNEL); |
| 660 | if (msg_data == NULL) |
| 661 | return -ENOMEM; |
| 662 | |
| 663 | if (memcpy_fromiovec(msg_data, msg->msg_iov, len)) { |
| 664 | kfree(msg_data); |
| 665 | return -EFAULT; |
| 666 | } |
| 667 | |
Samuel Ortiz | 94f418a | 2012-10-16 15:01:40 +0200 | [diff] [blame] | 668 | remaining_len = len; |
Samuel Ortiz | 6e950fd | 2012-10-29 14:02:17 +0100 | [diff] [blame] | 669 | msg_ptr = msg_data; |
Samuel Ortiz | 94f418a | 2012-10-16 15:01:40 +0200 | [diff] [blame] | 670 | |
| 671 | while (remaining_len > 0) { |
| 672 | |
Samuel Ortiz | e4306be | 2013-02-22 01:12:28 +0100 | [diff] [blame] | 673 | frag_len = min_t(size_t, sock->remote_miu, remaining_len); |
Samuel Ortiz | 94f418a | 2012-10-16 15:01:40 +0200 | [diff] [blame] | 674 | |
| 675 | pr_debug("Fragment %zd bytes remaining %zd", |
| 676 | frag_len, remaining_len); |
| 677 | |
| 678 | pdu = nfc_alloc_send_skb(sock->dev, &sock->sk, MSG_DONTWAIT, |
| 679 | frag_len + LLCP_HEADER_SIZE, &err); |
| 680 | if (pdu == NULL) { |
| 681 | pr_err("Could not allocate PDU\n"); |
| 682 | continue; |
| 683 | } |
| 684 | |
| 685 | pdu = llcp_add_header(pdu, dsap, ssap, LLCP_PDU_UI); |
| 686 | |
| 687 | memcpy(skb_put(pdu, frag_len), msg_ptr, frag_len); |
| 688 | |
| 689 | /* No need to check for the peer RW for UI frames */ |
| 690 | skb_queue_tail(&local->tx_queue, pdu); |
| 691 | |
| 692 | remaining_len -= frag_len; |
| 693 | msg_ptr += frag_len; |
| 694 | } |
| 695 | |
Samuel Ortiz | 6e950fd | 2012-10-29 14:02:17 +0100 | [diff] [blame] | 696 | kfree(msg_data); |
| 697 | |
Samuel Ortiz | 94f418a | 2012-10-16 15:01:40 +0200 | [diff] [blame] | 698 | return len; |
| 699 | } |
| 700 | |
Samuel Ortiz | d094afa | 2012-03-05 01:03:42 +0100 | [diff] [blame] | 701 | int nfc_llcp_send_rr(struct nfc_llcp_sock *sock) |
| 702 | { |
| 703 | struct sk_buff *skb; |
| 704 | struct nfc_llcp_local *local; |
| 705 | |
| 706 | pr_debug("Send rr nr %d\n", sock->recv_n); |
| 707 | |
| 708 | local = sock->local; |
| 709 | if (local == NULL) |
| 710 | return -ENODEV; |
| 711 | |
| 712 | skb = llcp_allocate_pdu(sock, LLCP_PDU_RR, LLCP_SEQUENCE_SIZE); |
| 713 | if (skb == NULL) |
| 714 | return -ENOMEM; |
| 715 | |
| 716 | skb_put(skb, LLCP_SEQUENCE_SIZE); |
| 717 | |
Samuel Ortiz | 279cf17 | 2012-04-10 19:43:14 +0200 | [diff] [blame] | 718 | skb->data[2] = sock->recv_n; |
Samuel Ortiz | d094afa | 2012-03-05 01:03:42 +0100 | [diff] [blame] | 719 | |
| 720 | skb_queue_head(&local->tx_queue, skb); |
| 721 | |
| 722 | return 0; |
| 723 | } |