net/phonet/pep.c

   1 /*
   2  * File: pep.c
   3  *
   4  * Phonet pipe protocol end point socket
   5  *
   6  * Copyright (C) 2008 Nokia Corporation.
   7  *
   8  * Author: Rémi Denis-Courmont <remi.denis-courmont@nokia.com>
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License
  12  * version 2 as published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  22  * 02110-1301 USA
  23  */
  24
  25 #include <linux/kernel.h>
  26 #include <linux/slab.h>
  27 #include <linux/socket.h>
  28 #include <net/sock.h>
  29 #include <net/tcp_states.h>
  30 #include <asm/ioctls.h>
  31
  32 #include <linux/phonet.h>
  33 #include <net/phonet/phonet.h>
  34 #include <net/phonet/pep.h>
  35 #include <net/phonet/gprs.h>
  36
  37 /* sk_state values:
  38  * TCP_CLOSE            sock not in use yet
  39  * TCP_CLOSE_WAIT       disconnected pipe
  40  * TCP_LISTEN           listening pipe endpoint
  41  * TCP_SYN_RECV         connected pipe in disabled state
  42  * TCP_ESTABLISHED      connected pipe in enabled state
  43  *
  44  * pep_sock locking:
  45  *  - sk_state, ackq, hlist: sock lock needed
  46  *  - listener: read only
  47  *  - pipe_handle: read only
  48  */
  49
  50 #define CREDITS_MAX     10
  51 #define CREDITS_THR     7
  52
  53 static const struct sockaddr_pn pipe_srv = {
  54         .spn_family = AF_PHONET,
  55         .spn_resource = 0xD9, /* pipe service */
  56 };
  57
  58 #define pep_sb_size(s) (((s) + 5) & ~3) /* 2-bytes head, 32-bits aligned */
  59
  60 /* Get the next TLV sub-block. */
  61 static unsigned char *pep_get_sb(struct sk_buff *skb, u8 *ptype, u8 *plen,
  62                                         void *buf)
  63 {
  64         void *data = NULL;
  65         struct {
  66                 u8 sb_type;
  67                 u8 sb_len;
  68         } *ph, h;
  69         int buflen = *plen;
  70
  71         ph = skb_header_pointer(skb, 0, 2, &h);
  72         if (ph == NULL || ph->sb_len < 2 || !pskb_may_pull(skb, ph->sb_len))
  73                 return NULL;
  74         ph->sb_len -= 2;
  75         *ptype = ph->sb_type;
  76         *plen = ph->sb_len;
  77
  78         if (buflen > ph->sb_len)
  79                 buflen = ph->sb_len;
  80         data = skb_header_pointer(skb, 2, buflen, buf);
  81         __skb_pull(skb, 2 + ph->sb_len);
  82         return data;
  83 }
  84
  85 static int pep_reply(struct sock *sk, struct sk_buff *oskb,
  86                         u8 code, const void *data, int len, gfp_t priority)
  87 {
  88         const struct pnpipehdr *oph = pnp_hdr(oskb);
  89         struct pnpipehdr *ph;
  90         struct sk_buff *skb;
  91 #ifdef CONFIG_PHONET_PIPECTRLR
  92         const struct phonethdr *hdr = pn_hdr(oskb);
  93         struct sockaddr_pn spn = {
  94                 .spn_family = AF_PHONET,
  95                 .spn_resource = 0xD9,
  96                 .spn_dev = hdr->pn_sdev,
  97                 .spn_obj = hdr->pn_sobj,
  98         };
  99 #endif
 100
 101         skb = alloc_skb(MAX_PNPIPE_HEADER + len, priority);
 102         if (!skb)
 103                 return -ENOMEM;
 104         skb_set_owner_w(skb, sk);
 105
 106         skb_reserve(skb, MAX_PNPIPE_HEADER);
 107         __skb_put(skb, len);
 108         skb_copy_to_linear_data(skb, data, len);
 109         __skb_push(skb, sizeof(*ph));
 110         skb_reset_transport_header(skb);
 111         ph = pnp_hdr(skb);
 112         ph->utid = oph->utid;
 113         ph->message_id = oph->message_id + 1; /* REQ -> RESP */
 114         ph->pipe_handle = oph->pipe_handle;
 115         ph->error_code = code;
 116
 117 #ifdef CONFIG_PHONET_PIPECTRLR
 118         return pn_skb_send(sk, skb, &spn);
 119 #else
 120         return pn_skb_send(sk, skb, &pipe_srv);
 121 #endif
 122 }
 123
 124 #define PAD 0x00
 125
 126 #ifdef CONFIG_PHONET_PIPECTRLR
 127 static u8 pipe_negotiate_fc(u8 *host_fc, u8 *remote_fc, int len)
 128 {
 129         int i, j;
 130         u8 base_fc, final_fc;
 131
 132         for (i = 0; i < len; i++) {
 133                 base_fc = host_fc[i];
 134                 for (j = 0; j < len; j++) {
 135                         if (remote_fc[j] == base_fc) {
 136                                 final_fc = base_fc;
 137                                 goto done;
 138                         }
 139                 }
 140         }
 141         return -EINVAL;
 142
 143 done:
 144         return final_fc;
 145
 146 }
 147
 148 static int pipe_get_flow_info(struct sock *sk, struct sk_buff *skb,
 149                 u8 *pref_rx_fc, u8 *req_tx_fc)
 150 {
 151         struct pnpipehdr *hdr;
 152         u8 n_sb;
 153
 154         if (!pskb_may_pull(skb, sizeof(*hdr) + 4))
 155                 return -EINVAL;
 156
 157         hdr = pnp_hdr(skb);
 158         n_sb = hdr->data[4];
 159
 160         __skb_pull(skb, sizeof(*hdr) + 4);
 161         while (n_sb > 0) {
 162                 u8 type, buf[3], len = sizeof(buf);
 163                 u8 *data = pep_get_sb(skb, &type, &len, buf);
 164
 165                 if (data == NULL)
 166                         return -EINVAL;
 167
 168                 switch (type) {
 169                 case PN_PIPE_SB_REQUIRED_FC_TX:
 170                         if (len < 3 || (data[2] | data[3] | data[4]) > 3)
 171                                 break;
 172                         req_tx_fc[0] = data[2];
 173                         req_tx_fc[1] = data[3];
 174                         req_tx_fc[2] = data[4];
 175                         break;
 176
 177                 case PN_PIPE_SB_PREFERRED_FC_RX:
 178                         if (len < 3 || (data[2] | data[3] | data[4]) > 3)
 179                                 break;
 180                         pref_rx_fc[0] = data[2];
 181                         pref_rx_fc[1] = data[3];
 182                         pref_rx_fc[2] = data[4];
 183                         break;
 184
 185                 }
 186                 n_sb--;
 187         }
 188         return 0;
 189 }
 190
 191 static int pipe_handler_send_req(struct sock *sk, u16 dobj, u8 utid,
 192                 u8 msg_id, u8 p_handle, gfp_t priority)
 193 {
 194         int len;
 195         struct pnpipehdr *ph;
 196         struct sk_buff *skb;
 197         struct sockaddr_pn spn = {
 198                 .spn_family = AF_PHONET,
 199                 .spn_resource = 0xD9,
 200                 .spn_dev = pn_dev(dobj),
 201                 .spn_obj = pn_obj(dobj),
 202         };
 203
 204         static const u8 data[4] = {
 205                 PAD, PAD, PAD, PAD,
 206         };
 207
 208         switch (msg_id) {
 209         case PNS_PEP_CONNECT_REQ:
 210                 len = sizeof(data);
 211                 break;
 212
 213         case PNS_PEP_DISCONNECT_REQ:
 214         case PNS_PEP_ENABLE_REQ:
 215         case PNS_PEP_DISABLE_REQ:
 216                 len = 0;
 217                 break;
 218
 219         default:
 220                 return -EINVAL;
 221         }
 222
 223         skb = alloc_skb(MAX_PNPIPE_HEADER + len, priority);
 224         if (!skb)
 225                 return -ENOMEM;
 226         skb_set_owner_w(skb, sk);
 227
 228         skb_reserve(skb, MAX_PNPIPE_HEADER);
 229         if (len) {
 230                 __skb_put(skb, len);
 231                 skb_copy_to_linear_data(skb, data, len);
 232         }
 233         __skb_push(skb, sizeof(*ph));
 234         skb_reset_transport_header(skb);
 235         ph = pnp_hdr(skb);
 236         ph->utid = utid;
 237         ph->message_id = msg_id;
 238         ph->pipe_handle = p_handle;
 239         ph->error_code = PN_PIPE_NO_ERROR;
 240
 241         return pn_skb_send(sk, skb, &spn);
 242 }
 243
 244 static int pipe_handler_send_created_ind(struct sock *sk, u16 dobj,
 245                 u8 utid, u8 p_handle, u8 msg_id, u8 tx_fc, u8 rx_fc)
 246 {
 247         int err_code;
 248         struct pnpipehdr *ph;
 249         struct sk_buff *skb;
 250         struct sockaddr_pn spn = {
 251                 .spn_family = AF_PHONET,
 252                 .spn_resource = 0xD9,
 253                 .spn_dev = pn_dev(dobj),
 254                 .spn_obj = pn_obj(dobj),
 255         };
 256
 257         static u8 data[4] = {
 258                 0x03, 0x04,
 259         };
 260         data[2] = tx_fc;
 261         data[3] = rx_fc;
 262
 263         /*
 264          * actually, below is number of sub-blocks and not error code.
 265          * Pipe_created_ind message format does not have any
 266          * error code field. However, the Phonet stack will always send
 267          * an error code as part of pnpipehdr. So, use that err_code to
 268          * specify the number of sub-blocks.
 269          */
 270         err_code = 0x01;
 271
 272         skb = alloc_skb(MAX_PNPIPE_HEADER + sizeof(data), GFP_ATOMIC);
 273         if (!skb)
 274                 return -ENOMEM;
 275         skb_set_owner_w(skb, sk);
 276
 277         skb_reserve(skb, MAX_PNPIPE_HEADER);
 278         __skb_put(skb, sizeof(data));
 279         skb_copy_to_linear_data(skb, data, sizeof(data));
 280         __skb_push(skb, sizeof(*ph));
 281         skb_reset_transport_header(skb);
 282         ph = pnp_hdr(skb);
 283         ph->utid = utid;
 284         ph->message_id = msg_id;
 285         ph->pipe_handle = p_handle;
 286         ph->error_code = err_code;
 287
 288         return pn_skb_send(sk, skb, &spn);
 289 }
 290
 291 static int pipe_handler_send_ind(struct sock *sk, u16 dobj, u8 utid,
 292                 u8 p_handle, u8 msg_id)
 293 {
 294         int err_code;
 295         struct pnpipehdr *ph;
 296         struct sk_buff *skb;
 297         struct sockaddr_pn spn = {
 298                 .spn_family = AF_PHONET,
 299                 .spn_resource = 0xD9,
 300                 .spn_dev = pn_dev(dobj),
 301                 .spn_obj = pn_obj(dobj),
 302         };
 303
 304         /*
 305          * actually, below is a filler.
 306          * Pipe_enabled/disabled_ind message format does not have any
 307          * error code field. However, the Phonet stack will always send
 308          * an error code as part of pnpipehdr. So, use that err_code to
 309          * specify the filler value.
 310          */
 311         err_code = 0x0;
 312
 313         skb = alloc_skb(MAX_PNPIPE_HEADER, GFP_ATOMIC);
 314         if (!skb)
 315                 return -ENOMEM;
 316         skb_set_owner_w(skb, sk);
 317
 318         skb_reserve(skb, MAX_PNPIPE_HEADER);
 319         __skb_push(skb, sizeof(*ph));
 320         skb_reset_transport_header(skb);
 321         ph = pnp_hdr(skb);
 322         ph->utid = utid;
 323         ph->message_id = msg_id;
 324         ph->pipe_handle = p_handle;
 325         ph->error_code = err_code;
 326
 327         return pn_skb_send(sk, skb, &spn);
 328 }
 329
 330 static int pipe_handler_enable_pipe(struct sock *sk, int cmd)
 331 {
 332         int ret;
 333         struct pep_sock *pn = pep_sk(sk);
 334
 335         switch (cmd) {
 336         case PNPIPE_ENABLE:
 337                 ret = pipe_handler_send_req(sk, pn->pn_sk.sobject,
 338                                 PNS_PIPE_ENABLE_UTID, PNS_PEP_ENABLE_REQ,
 339                                 pn->pipe_handle, GFP_ATOMIC);
 340                 break;
 341
 342         case PNPIPE_DISABLE:
 343                 ret = pipe_handler_send_req(sk, pn->pn_sk.sobject,
 344                                 PNS_PIPE_DISABLE_UTID, PNS_PEP_DISABLE_REQ,
 345                                 pn->pipe_handle, GFP_ATOMIC);
 346                 break;
 347
 348         default:
 349                 ret = -EINVAL;
 350         }
 351
 352         return ret;
 353 }
 354
 355 static int pipe_handler_create_pipe(struct sock *sk, int pipe_handle, int cmd)
 356 {
 357         int ret;
 358         struct pep_sock *pn = pep_sk(sk);
 359
 360         switch (cmd) {
 361         case PNPIPE_CREATE:
 362                 ret = pipe_handler_send_req(sk, pn->pn_sk.sobject,
 363                                 PNS_PEP_CONNECT_UTID, PNS_PEP_CONNECT_REQ,
 364                                 pipe_handle, GFP_ATOMIC);
 365                 break;
 366
 367         case PNPIPE_DESTROY:
 368                 ret = pipe_handler_send_req(sk, pn->remote_pep,
 369                                 PNS_PEP_DISCONNECT_UTID,
 370                                 PNS_PEP_DISCONNECT_REQ,
 371                                 pn->pipe_handle, GFP_ATOMIC);
 372                 break;
 373
 374         default:
 375                 ret = -EINVAL;
 376         }
 377
 378         return ret;
 379 }
 380 #endif
 381
 382 static int pep_accept_conn(struct sock *sk, struct sk_buff *skb)
 383 {
 384         static const u8 data[20] = {
 385                 PAD, PAD, PAD, 2 /* sub-blocks */,
 386                 PN_PIPE_SB_REQUIRED_FC_TX, pep_sb_size(5), 3, PAD,
 387                         PN_MULTI_CREDIT_FLOW_CONTROL,
 388                         PN_ONE_CREDIT_FLOW_CONTROL,
 389                         PN_LEGACY_FLOW_CONTROL,
 390                         PAD,
 391                 PN_PIPE_SB_PREFERRED_FC_RX, pep_sb_size(5), 3, PAD,
 392                         PN_MULTI_CREDIT_FLOW_CONTROL,
 393                         PN_ONE_CREDIT_FLOW_CONTROL,
 394                         PN_LEGACY_FLOW_CONTROL,
 395                         PAD,
 396         };
 397
 398         might_sleep();
 399         return pep_reply(sk, skb, PN_PIPE_NO_ERROR, data, sizeof(data),
 400                                 GFP_KERNEL);
 401 }
 402
 403 static int pep_reject_conn(struct sock *sk, struct sk_buff *skb, u8 code)
 404 {
 405         static const u8 data[4] = { PAD, PAD, PAD, 0 /* sub-blocks */ };
 406         WARN_ON(code == PN_PIPE_NO_ERROR);
 407         return pep_reply(sk, skb, code, data, sizeof(data), GFP_ATOMIC);
 408 }
 409
 410 /* Control requests are not sent by the pipe service and have a specific
 411  * message format. */
 412 static int pep_ctrlreq_error(struct sock *sk, struct sk_buff *oskb, u8 code,
 413                                 gfp_t priority)
 414 {
 415         const struct pnpipehdr *oph = pnp_hdr(oskb);
 416         struct sk_buff *skb;
 417         struct pnpipehdr *ph;
 418         struct sockaddr_pn dst;
 419
 420         skb = alloc_skb(MAX_PNPIPE_HEADER + 4, priority);
 421         if (!skb)
 422                 return -ENOMEM;
 423         skb_set_owner_w(skb, sk);
 424
 425         skb_reserve(skb, MAX_PHONET_HEADER);
 426         ph = (struct pnpipehdr *)skb_put(skb, sizeof(*ph) + 4);
 427
 428         ph->utid = oph->utid;
 429         ph->message_id = PNS_PEP_CTRL_RESP;
 430         ph->pipe_handle = oph->pipe_handle;
 431         ph->data[0] = oph->data[1]; /* CTRL id */
 432         ph->data[1] = oph->data[0]; /* PEP type */
 433         ph->data[2] = code; /* error code, at an usual offset */
 434         ph->data[3] = PAD;
 435         ph->data[4] = PAD;
 436
 437         pn_skb_get_src_sockaddr(oskb, &dst);
 438         return pn_skb_send(sk, skb, &dst);
 439 }
 440
 441 static int pipe_snd_status(struct sock *sk, u8 type, u8 status, gfp_t priority)
 442 {
 443         struct pep_sock *pn = pep_sk(sk);
 444         struct pnpipehdr *ph;
 445         struct sk_buff *skb;
 446 #ifdef CONFIG_PHONET_PIPECTRLR
 447         struct sockaddr_pn spn = {
 448                 .spn_family = AF_PHONET,
 449                 .spn_resource = 0xD9,
 450                 .spn_dev = pn_dev(pn->remote_pep),
 451                 .spn_obj = pn_obj(pn->remote_pep),
 452         };
 453 #endif
 454
 455         skb = alloc_skb(MAX_PNPIPE_HEADER + 4, priority);
 456         if (!skb)
 457                 return -ENOMEM;
 458         skb_set_owner_w(skb, sk);
 459
 460         skb_reserve(skb, MAX_PNPIPE_HEADER + 4);
 461         __skb_push(skb, sizeof(*ph) + 4);
 462         skb_reset_transport_header(skb);
 463         ph = pnp_hdr(skb);
 464         ph->utid = 0;
 465         ph->message_id = PNS_PEP_STATUS_IND;
 466         ph->pipe_handle = pn->pipe_handle;
 467         ph->pep_type = PN_PEP_TYPE_COMMON;
 468         ph->data[1] = type;
 469         ph->data[2] = PAD;
 470         ph->data[3] = PAD;
 471         ph->data[4] = status;
 472
 473 #ifdef CONFIG_PHONET_PIPECTRLR
 474         return pn_skb_send(sk, skb, &spn);
 475 #else
 476         return pn_skb_send(sk, skb, &pipe_srv);
 477 #endif
 478 }
 479
 480 /* Send our RX flow control information to the sender.
 481  * Socket must be locked. */
 482 static void pipe_grant_credits(struct sock *sk)
 483 {
 484         struct pep_sock *pn = pep_sk(sk);
 485
 486         BUG_ON(sk->sk_state != TCP_ESTABLISHED);
 487
 488         switch (pn->rx_fc) {
 489         case PN_LEGACY_FLOW_CONTROL: /* TODO */
 490                 break;
 491         case PN_ONE_CREDIT_FLOW_CONTROL:
 492                 pipe_snd_status(sk, PN_PEP_IND_FLOW_CONTROL,
 493                                 PEP_IND_READY, GFP_ATOMIC);
 494                 pn->rx_credits = 1;
 495                 break;
 496         case PN_MULTI_CREDIT_FLOW_CONTROL:
 497                 if ((pn->rx_credits + CREDITS_THR) > CREDITS_MAX)
 498                         break;
 499                 if (pipe_snd_status(sk, PN_PEP_IND_ID_MCFC_GRANT_CREDITS,
 500                                         CREDITS_MAX - pn->rx_credits,
 501                                         GFP_ATOMIC) == 0)
 502                         pn->rx_credits = CREDITS_MAX;
 503                 break;
 504         }
 505 }
 506
 507 static int pipe_rcv_status(struct sock *sk, struct sk_buff *skb)
 508 {
 509         struct pep_sock *pn = pep_sk(sk);
 510         struct pnpipehdr *hdr;
 511         int wake = 0;
 512
 513         if (!pskb_may_pull(skb, sizeof(*hdr) + 4))
 514                 return -EINVAL;
 515
 516         hdr = pnp_hdr(skb);
 517         if (hdr->data[0] != PN_PEP_TYPE_COMMON) {
 518                 LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP type: %u\n",
 519                                 (unsigned)hdr->data[0]);
 520                 return -EOPNOTSUPP;
 521         }
 522
 523         switch (hdr->data[1]) {
 524         case PN_PEP_IND_FLOW_CONTROL:
 525                 switch (pn->tx_fc) {
 526                 case PN_LEGACY_FLOW_CONTROL:
 527                         switch (hdr->data[4]) {
 528                         case PEP_IND_BUSY:
 529                                 atomic_set(&pn->tx_credits, 0);
 530                                 break;
 531                         case PEP_IND_READY:
 532                                 atomic_set(&pn->tx_credits, wake = 1);
 533                                 break;
 534                         }
 535                         break;
 536                 case PN_ONE_CREDIT_FLOW_CONTROL:
 537                         if (hdr->data[4] == PEP_IND_READY)
 538                                 atomic_set(&pn->tx_credits, wake = 1);
 539                         break;
 540                 }
 541                 break;
 542
 543         case PN_PEP_IND_ID_MCFC_GRANT_CREDITS:
 544                 if (pn->tx_fc != PN_MULTI_CREDIT_FLOW_CONTROL)
 545                         break;
 546                 atomic_add(wake = hdr->data[4], &pn->tx_credits);
 547                 break;
 548
 549         default:
 550                 LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP indication: %u\n",
 551                                 (unsigned)hdr->data[1]);
 552                 return -EOPNOTSUPP;
 553         }
 554         if (wake)
 555                 sk->sk_write_space(sk);
 556         return 0;
 557 }
 558
 559 static int pipe_rcv_created(struct sock *sk, struct sk_buff *skb)
 560 {
 561         struct pep_sock *pn = pep_sk(sk);
 562         struct pnpipehdr *hdr = pnp_hdr(skb);
 563         u8 n_sb = hdr->data[0];
 564
 565         pn->rx_fc = pn->tx_fc = PN_LEGACY_FLOW_CONTROL;
 566         __skb_pull(skb, sizeof(*hdr));
 567         while (n_sb > 0) {
 568                 u8 type, buf[2], len = sizeof(buf);
 569                 u8 *data = pep_get_sb(skb, &type, &len, buf);
 570
 571                 if (data == NULL)
 572                         return -EINVAL;
 573                 switch (type) {
 574                 case PN_PIPE_SB_NEGOTIATED_FC:
 575                         if (len < 2 || (data[0] | data[1]) > 3)
 576                                 break;
 577                         pn->tx_fc = data[0] & 3;
 578                         pn->rx_fc = data[1] & 3;
 579                         break;
 580                 }
 581                 n_sb--;
 582         }
 583         return 0;
 584 }
 585
 586 /* Queue an skb to a connected sock.
 587  * Socket lock must be held. */
 588 static int pipe_do_rcv(struct sock *sk, struct sk_buff *skb)
 589 {
 590         struct pep_sock *pn = pep_sk(sk);
 591         struct pnpipehdr *hdr = pnp_hdr(skb);
 592         struct sk_buff_head *queue;
 593         int err = 0;
 594 #ifdef CONFIG_PHONET_PIPECTRLR
 595         struct phonethdr *ph = pn_hdr(skb);
 596         static u8 host_pref_rx_fc[3], host_req_tx_fc[3];
 597         u8 remote_pref_rx_fc[3], remote_req_tx_fc[3];
 598         u8 negotiated_rx_fc, negotiated_tx_fc;
 599 #endif
 600
 601         BUG_ON(sk->sk_state == TCP_CLOSE_WAIT);
 602
 603         switch (hdr->message_id) {
 604         case PNS_PEP_CONNECT_REQ:
 605                 pep_reject_conn(sk, skb, PN_PIPE_ERR_PEP_IN_USE);
 606                 break;
 607
 608 #ifdef CONFIG_PHONET_PIPECTRLR
 609         case PNS_PEP_CONNECT_RESP:
 610                 if ((ph->pn_sdev == pn_dev(pn->remote_pep)) &&
 611                                 (ph->pn_sobj == pn_obj(pn->remote_pep))) {
 612                         pipe_get_flow_info(sk, skb, remote_pref_rx_fc,
 613                                         remote_req_tx_fc);
 614
 615                          negotiated_tx_fc = pipe_negotiate_fc(remote_req_tx_fc,
 616                                          host_pref_rx_fc,
 617                                          sizeof(host_pref_rx_fc));
 618                          negotiated_rx_fc = pipe_negotiate_fc(host_req_tx_fc,
 619                                          remote_pref_rx_fc,
 620                                          sizeof(host_pref_rx_fc));
 621
 622                         pn->pipe_state = PIPE_DISABLED;
 623                         pipe_handler_send_created_ind(sk, pn->remote_pep,
 624                                         PNS_PIPE_CREATED_IND_UTID,
 625                                         pn->pipe_handle, PNS_PIPE_CREATED_IND,
 626                                         negotiated_tx_fc, negotiated_rx_fc);
 627                         pipe_handler_send_created_ind(sk, pn->pn_sk.sobject,
 628                                         PNS_PIPE_CREATED_IND_UTID,
 629                                         pn->pipe_handle, PNS_PIPE_CREATED_IND,
 630                                         negotiated_tx_fc, negotiated_rx_fc);
 631                 } else {
 632                         pipe_handler_send_req(sk, pn->remote_pep,
 633                                         PNS_PEP_CONNECT_UTID,
 634                                         PNS_PEP_CONNECT_REQ, pn->pipe_handle,
 635                                         GFP_ATOMIC);
 636                         pipe_get_flow_info(sk, skb, host_pref_rx_fc,
 637                                         host_req_tx_fc);
 638                 }
 639                 break;
 640 #endif
 641
 642         case PNS_PEP_DISCONNECT_REQ:
 643                 pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
 644                 sk->sk_state = TCP_CLOSE_WAIT;
 645                 if (!sock_flag(sk, SOCK_DEAD))
 646                         sk->sk_state_change(sk);
 647                 break;
 648
 649 #ifdef CONFIG_PHONET_PIPECTRLR
 650         case PNS_PEP_DISCONNECT_RESP:
 651                 pn->pipe_state = PIPE_IDLE;
 652                 pipe_handler_send_req(sk, pn->pn_sk.sobject,
 653                                 PNS_PEP_DISCONNECT_UTID,
 654                                 PNS_PEP_DISCONNECT_REQ, pn->pipe_handle,
 655                                 GFP_KERNEL);
 656                 break;
 657 #endif
 658
 659         case PNS_PEP_ENABLE_REQ:
 660                 /* Wait for PNS_PIPE_(ENABLED|REDIRECTED)_IND */
 661                 pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
 662                 break;
 663
 664 #ifdef CONFIG_PHONET_PIPECTRLR
 665         case PNS_PEP_ENABLE_RESP:
 666                 if ((ph->pn_sdev == pn_dev(pn->remote_pep)) &&
 667                                 (ph->pn_sobj == pn_obj(pn->remote_pep))) {
 668                         pn->pipe_state = PIPE_ENABLED;
 669                         pipe_handler_send_ind(sk, pn->remote_pep,
 670                                         PNS_PIPE_ENABLED_IND_UTID,
 671                                         pn->pipe_handle, PNS_PIPE_ENABLED_IND);
 672                         pipe_handler_send_ind(sk, pn->pn_sk.sobject,
 673                                         PNS_PIPE_ENABLED_IND_UTID,
 674                                         pn->pipe_handle, PNS_PIPE_ENABLED_IND);
 675                 } else
 676                         pipe_handler_send_req(sk, pn->remote_pep,
 677                                         PNS_PIPE_ENABLE_UTID,
 678                                         PNS_PEP_ENABLE_REQ, pn->pipe_handle,
 679                                         GFP_KERNEL);
 680
 681                 break;
 682 #endif
 683
 684         case PNS_PEP_RESET_REQ:
 685                 switch (hdr->state_after_reset) {
 686                 case PN_PIPE_DISABLE:
 687                         pn->init_enable = 0;
 688                         break;
 689                 case PN_PIPE_ENABLE:
 690                         pn->init_enable = 1;
 691                         break;
 692                 default: /* not allowed to send an error here!? */
 693                         err = -EINVAL;
 694                         goto out;
 695                 }
 696                 /* fall through */
 697         case PNS_PEP_DISABLE_REQ:
 698                 atomic_set(&pn->tx_credits, 0);
 699                 pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
 700                 break;
 701
 702 #ifdef CONFIG_PHONET_PIPECTRLR
 703         case PNS_PEP_DISABLE_RESP:
 704                 if ((ph->pn_sdev == pn_dev(pn->remote_pep)) &&
 705                                 (ph->pn_sobj == pn_obj(pn->remote_pep))) {
 706                         pn->pipe_state = PIPE_DISABLED;
 707                         pipe_handler_send_ind(sk, pn->remote_pep,
 708                                         PNS_PIPE_DISABLED_IND_UTID,
 709                                         pn->pipe_handle,
 710                                         PNS_PIPE_DISABLED_IND);
 711                         pipe_handler_send_ind(sk, pn->pn_sk.sobject,
 712                                         PNS_PIPE_DISABLED_IND_UTID,
 713                                         pn->pipe_handle,
 714                                         PNS_PIPE_DISABLED_IND);
 715                 } else
 716                         pipe_handler_send_req(sk, pn->remote_pep,
 717                                         PNS_PIPE_DISABLE_UTID,
 718                                         PNS_PEP_DISABLE_REQ, pn->pipe_handle,
 719                                         GFP_KERNEL);
 720                 break;
 721 #endif
 722
 723         case PNS_PEP_CTRL_REQ:
 724                 if (skb_queue_len(&pn->ctrlreq_queue) >= PNPIPE_CTRLREQ_MAX) {
 725                         atomic_inc(&sk->sk_drops);
 726                         break;
 727                 }
 728                 __skb_pull(skb, 4);
 729                 queue = &pn->ctrlreq_queue;
 730                 goto queue;
 731
 732         case PNS_PIPE_ALIGNED_DATA:
 733                 __skb_pull(skb, 1);
 734                 /* fall through */
 735         case PNS_PIPE_DATA:
 736                 __skb_pull(skb, 3); /* Pipe data header */
 737                 if (!pn_flow_safe(pn->rx_fc)) {
 738                         err = sock_queue_rcv_skb(sk, skb);
 739                         if (!err)
 740                                 return 0;
 741                         break;
 742                 }
 743
 744                 if (pn->rx_credits == 0) {
 745                         atomic_inc(&sk->sk_drops);
 746                         err = -ENOBUFS;
 747                         break;
 748                 }
 749                 pn->rx_credits--;
 750                 queue = &sk->sk_receive_queue;
 751                 goto queue;
 752
 753         case PNS_PEP_STATUS_IND:
 754                 pipe_rcv_status(sk, skb);
 755                 break;
 756
 757         case PNS_PIPE_REDIRECTED_IND:
 758                 err = pipe_rcv_created(sk, skb);
 759                 break;
 760
 761         case PNS_PIPE_CREATED_IND:
 762                 err = pipe_rcv_created(sk, skb);
 763                 if (err)
 764                         break;
 765                 /* fall through */
 766         case PNS_PIPE_RESET_IND:
 767                 if (!pn->init_enable)
 768                         break;
 769                 /* fall through */
 770         case PNS_PIPE_ENABLED_IND:
 771                 if (!pn_flow_safe(pn->tx_fc)) {
 772                         atomic_set(&pn->tx_credits, 1);
 773                         sk->sk_write_space(sk);
 774                 }
 775                 if (sk->sk_state == TCP_ESTABLISHED)
 776                         break; /* Nothing to do */
 777                 sk->sk_state = TCP_ESTABLISHED;
 778                 pipe_grant_credits(sk);
 779                 break;
 780
 781         case PNS_PIPE_DISABLED_IND:
 782                 sk->sk_state = TCP_SYN_RECV;
 783                 pn->rx_credits = 0;
 784                 break;
 785
 786         default:
 787                 LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP message: %u\n",
 788                                 hdr->message_id);
 789                 err = -EINVAL;
 790         }
 791 out:
 792         kfree_skb(skb);
 793         return err;
 794
 795 queue:
 796         skb->dev = NULL;
 797         skb_set_owner_r(skb, sk);
 798         err = skb->len;
 799         skb_queue_tail(queue, skb);
 800         if (!sock_flag(sk, SOCK_DEAD))
 801                 sk->sk_data_ready(sk, err);
 802         return 0;
 803 }
 804
 805 /* Destroy connected sock. */
 806 static void pipe_destruct(struct sock *sk)
 807 {
 808         struct pep_sock *pn = pep_sk(sk);
 809
 810         skb_queue_purge(&sk->sk_receive_queue);
 811         skb_queue_purge(&pn->ctrlreq_queue);
 812 }
 813
 814 static int pep_connreq_rcv(struct sock *sk, struct sk_buff *skb)
 815 {
 816         struct sock *newsk;
 817         struct pep_sock *newpn, *pn = pep_sk(sk);
 818         struct pnpipehdr *hdr;
 819         struct sockaddr_pn dst;
 820         u16 peer_type;
 821         u8 pipe_handle, enabled, n_sb;
 822         u8 aligned = 0;
 823
 824         if (!pskb_pull(skb, sizeof(*hdr) + 4))
 825                 return -EINVAL;
 826
 827         hdr = pnp_hdr(skb);
 828         pipe_handle = hdr->pipe_handle;
 829         switch (hdr->state_after_connect) {
 830         case PN_PIPE_DISABLE:
 831                 enabled = 0;
 832                 break;
 833         case PN_PIPE_ENABLE:
 834                 enabled = 1;
 835                 break;
 836         default:
 837                 pep_reject_conn(sk, skb, PN_PIPE_ERR_INVALID_PARAM);
 838                 return -EINVAL;
 839         }
 840         peer_type = hdr->other_pep_type << 8;
 841
 842         if (unlikely(sk->sk_state != TCP_LISTEN) || sk_acceptq_is_full(sk)) {
 843                 pep_reject_conn(sk, skb, PN_PIPE_ERR_PEP_IN_USE);
 844                 return -ENOBUFS;
 845         }
 846
 847         /* Parse sub-blocks (options) */
 848         n_sb = hdr->data[4];
 849         while (n_sb > 0) {
 850                 u8 type, buf[1], len = sizeof(buf);
 851                 const u8 *data = pep_get_sb(skb, &type, &len, buf);
 852
 853                 if (data == NULL)
 854                         return -EINVAL;
 855                 switch (type) {
 856                 case PN_PIPE_SB_CONNECT_REQ_PEP_SUB_TYPE:
 857                         if (len < 1)
 858                                 return -EINVAL;
 859                         peer_type = (peer_type & 0xff00) | data[0];
 860                         break;
 861                 case PN_PIPE_SB_ALIGNED_DATA:
 862                         aligned = data[0] != 0;
 863                         break;
 864                 }
 865                 n_sb--;
 866         }
 867
 868         skb = skb_clone(skb, GFP_ATOMIC);
 869         if (!skb)
 870                 return -ENOMEM;
 871
 872         /* Create a new to-be-accepted sock */
 873         newsk = sk_alloc(sock_net(sk), PF_PHONET, GFP_ATOMIC, sk->sk_prot);
 874         if (!newsk) {
 875                 kfree_skb(skb);
 876                 return -ENOMEM;
 877         }
 878         sock_init_data(NULL, newsk);
 879         newsk->sk_state = TCP_SYN_RECV;
 880         newsk->sk_backlog_rcv = pipe_do_rcv;
 881         newsk->sk_protocol = sk->sk_protocol;
 882         newsk->sk_destruct = pipe_destruct;
 883
 884         newpn = pep_sk(newsk);
 885         pn_skb_get_dst_sockaddr(skb, &dst);
 886         newpn->pn_sk.sobject = pn_sockaddr_get_object(&dst);
 887         newpn->pn_sk.resource = pn->pn_sk.resource;
 888         skb_queue_head_init(&newpn->ctrlreq_queue);
 889         newpn->pipe_handle = pipe_handle;
 890         atomic_set(&newpn->tx_credits, 0);
 891         newpn->peer_type = peer_type;
 892         newpn->rx_credits = 0;
 893         newpn->rx_fc = newpn->tx_fc = PN_LEGACY_FLOW_CONTROL;
 894         newpn->init_enable = enabled;
 895         newpn->aligned = aligned;
 896 #ifdef CONFIG_PHONET_PIPECTRLR
 897         newpn->remote_pep = pn->remote_pep;
 898 #endif
 899
 900         BUG_ON(!skb_queue_empty(&newsk->sk_receive_queue));
 901         skb_queue_head(&newsk->sk_receive_queue, skb);
 902         if (!sock_flag(sk, SOCK_DEAD))
 903                 sk->sk_data_ready(sk, 0);
 904
 905         sk_acceptq_added(sk);
 906         sk_add_node(newsk, &pn->ackq);
 907         return 0;
 908 }
 909
 910 /* Listening sock must be locked */
 911 static struct sock *pep_find_pipe(const struct hlist_head *hlist,
 912                                         const struct sockaddr_pn *dst,
 913                                         u8 pipe_handle)
 914 {
 915         struct hlist_node *node;
 916         struct sock *sknode;
 917         u16 dobj = pn_sockaddr_get_object(dst);
 918
 919         sk_for_each(sknode, node, hlist) {
 920                 struct pep_sock *pnnode = pep_sk(sknode);
 921
 922                 /* Ports match, but addresses might not: */
 923                 if (pnnode->pn_sk.sobject != dobj)
 924                         continue;
 925                 if (pnnode->pipe_handle != pipe_handle)
 926                         continue;
 927                 if (sknode->sk_state == TCP_CLOSE_WAIT)
 928                         continue;
 929
 930                 sock_hold(sknode);
 931                 return sknode;
 932         }
 933         return NULL;
 934 }
 935
 936 /*
 937  * Deliver an skb to a listening sock.
 938  * Socket lock must be held.
 939  * We then queue the skb to the right connected sock (if any).
 940  */
 941 static int pep_do_rcv(struct sock *sk, struct sk_buff *skb)
 942 {
 943         struct pep_sock *pn = pep_sk(sk);
 944         struct sock *sknode;
 945         struct pnpipehdr *hdr;
 946         struct sockaddr_pn dst;
 947         int err = NET_RX_SUCCESS;
 948         u8 pipe_handle;
 949
 950         if (!pskb_may_pull(skb, sizeof(*hdr)))
 951                 goto drop;
 952
 953         hdr = pnp_hdr(skb);
 954         pipe_handle = hdr->pipe_handle;
 955         if (pipe_handle == PN_PIPE_INVALID_HANDLE)
 956                 goto drop;
 957
 958         pn_skb_get_dst_sockaddr(skb, &dst);
 959
 960         /* Look for an existing pipe handle */
 961         sknode = pep_find_pipe(&pn->hlist, &dst, pipe_handle);
 962         if (sknode)
 963                 return sk_receive_skb(sknode, skb, 1);
 964
 965         /* Look for a pipe handle pending accept */
 966         sknode = pep_find_pipe(&pn->ackq, &dst, pipe_handle);
 967         if (sknode) {
 968                 sock_put(sknode);
 969                 if (net_ratelimit())
 970                         printk(KERN_WARNING"Phonet unconnected PEP ignored");
 971                 err = NET_RX_DROP;
 972                 goto drop;
 973         }
 974
 975         switch (hdr->message_id) {
 976         case PNS_PEP_CONNECT_REQ:
 977                 err = pep_connreq_rcv(sk, skb);
 978                 break;
 979
 980         case PNS_PEP_DISCONNECT_REQ:
 981                 pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
 982                 break;
 983
 984         case PNS_PEP_CTRL_REQ:
 985                 pep_ctrlreq_error(sk, skb, PN_PIPE_INVALID_HANDLE, GFP_ATOMIC);
 986                 break;
 987
 988         case PNS_PEP_RESET_REQ:
 989         case PNS_PEP_ENABLE_REQ:
 990         case PNS_PEP_DISABLE_REQ:
 991                 /* invalid handle is not even allowed here! */
 992         default:
 993                 err = NET_RX_DROP;
 994         }
 995 drop:
 996         kfree_skb(skb);
 997         return err;
 998 }
 999
1000 static int pipe_do_remove(struct sock *sk)
1001 {
1002         struct pep_sock *pn = pep_sk(sk);
1003         struct pnpipehdr *ph;
1004         struct sk_buff *skb;
1005
1006         skb = alloc_skb(MAX_PNPIPE_HEADER, GFP_KERNEL);
1007         if (!skb)
1008                 return -ENOMEM;
1009
1010         skb_reserve(skb, MAX_PNPIPE_HEADER);
1011         __skb_push(skb, sizeof(*ph));
1012         skb_reset_transport_header(skb);
1013         ph = pnp_hdr(skb);
1014         ph->utid = 0;
1015         ph->message_id = PNS_PIPE_REMOVE_REQ;
1016         ph->pipe_handle = pn->pipe_handle;
1017         ph->data[0] = PAD;
1018
1019         return pn_skb_send(sk, skb, &pipe_srv);
1020 }
1021
1022 /* associated socket ceases to exist */
1023 static void pep_sock_close(struct sock *sk, long timeout)
1024 {
1025         struct pep_sock *pn = pep_sk(sk);
1026         int ifindex = 0;
1027
1028         sock_hold(sk); /* keep a reference after sk_common_release() */
1029         sk_common_release(sk);
1030
1031         lock_sock(sk);
1032         if (sk->sk_state == TCP_LISTEN) {
1033                 /* Destroy the listen queue */
1034                 struct sock *sknode;
1035                 struct hlist_node *p, *n;
1036
1037                 sk_for_each_safe(sknode, p, n, &pn->ackq)
1038                         sk_del_node_init(sknode);
1039                 sk->sk_state = TCP_CLOSE;
1040         } else if ((1 << sk->sk_state) & (TCPF_SYN_RECV|TCPF_ESTABLISHED))
1041                 /* Forcefully remove dangling Phonet pipe */
1042                 pipe_do_remove(sk);
1043
1044         ifindex = pn->ifindex;
1045         pn->ifindex = 0;
1046         release_sock(sk);
1047
1048         if (ifindex)
1049                 gprs_detach(sk);
1050         sock_put(sk);
1051 }
1052
1053 static int pep_wait_connreq(struct sock *sk, int noblock)
1054 {
1055         struct task_struct *tsk = current;
1056         struct pep_sock *pn = pep_sk(sk);
1057         long timeo = sock_rcvtimeo(sk, noblock);
1058
1059         for (;;) {
1060                 DEFINE_WAIT(wait);
1061
1062                 if (sk->sk_state != TCP_LISTEN)
1063                         return -EINVAL;
1064                 if (!hlist_empty(&pn->ackq))
1065                         break;
1066                 if (!timeo)
1067                         return -EWOULDBLOCK;
1068                 if (signal_pending(tsk))
1069                         return sock_intr_errno(timeo);
1070
1071                 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
1072                                                 TASK_INTERRUPTIBLE);
1073                 release_sock(sk);
1074                 timeo = schedule_timeout(timeo);
1075                 lock_sock(sk);
1076                 finish_wait(sk_sleep(sk), &wait);
1077         }
1078
1079         return 0;
1080 }
1081
1082 static struct sock *pep_sock_accept(struct sock *sk, int flags, int *errp)
1083 {
1084         struct pep_sock *pn = pep_sk(sk);
1085         struct sock *newsk = NULL;
1086         struct sk_buff *oskb;
1087         int err;
1088
1089         lock_sock(sk);
1090         err = pep_wait_connreq(sk, flags & O_NONBLOCK);
1091         if (err)
1092                 goto out;
1093
1094         newsk = __sk_head(&pn->ackq);
1095
1096         oskb = skb_dequeue(&newsk->sk_receive_queue);
1097         err = pep_accept_conn(newsk, oskb);
1098         if (err) {
1099                 skb_queue_head(&newsk->sk_receive_queue, oskb);
1100                 newsk = NULL;
1101                 goto out;
1102         }
1103         kfree_skb(oskb);
1104
1105         sock_hold(sk);
1106         pep_sk(newsk)->listener = sk;
1107
1108         sock_hold(newsk);
1109         sk_del_node_init(newsk);
1110         sk_acceptq_removed(sk);
1111         sk_add_node(newsk, &pn->hlist);
1112         __sock_put(newsk);
1113
1114 out:
1115         release_sock(sk);
1116         *errp = err;
1117         return newsk;
1118 }
1119
1120 static int pep_ioctl(struct sock *sk, int cmd, unsigned long arg)
1121 {
1122         struct pep_sock *pn = pep_sk(sk);
1123         int answ;
1124
1125         switch (cmd) {
1126         case SIOCINQ:
1127                 if (sk->sk_state == TCP_LISTEN)
1128                         return -EINVAL;
1129
1130                 lock_sock(sk);
1131                 if (sock_flag(sk, SOCK_URGINLINE) &&
1132                     !skb_queue_empty(&pn->ctrlreq_queue))
1133                         answ = skb_peek(&pn->ctrlreq_queue)->len;
1134                 else if (!skb_queue_empty(&sk->sk_receive_queue))
1135                         answ = skb_peek(&sk->sk_receive_queue)->len;
1136                 else
1137                         answ = 0;
1138                 release_sock(sk);
1139                 return put_user(answ, (int __user *)arg);
1140         }
1141
1142         return -ENOIOCTLCMD;
1143 }
1144
1145 static int pep_init(struct sock *sk)
1146 {
1147         struct pep_sock *pn = pep_sk(sk);
1148
1149         INIT_HLIST_HEAD(&pn->ackq);
1150         INIT_HLIST_HEAD(&pn->hlist);
1151         skb_queue_head_init(&pn->ctrlreq_queue);
1152         pn->pipe_handle = PN_PIPE_INVALID_HANDLE;
1153         return 0;
1154 }
1155
1156 static int pep_setsockopt(struct sock *sk, int level, int optname,
1157                                 char __user *optval, unsigned int optlen)
1158 {
1159         struct pep_sock *pn = pep_sk(sk);
1160         int val = 0, err = 0;
1161 #ifdef CONFIG_PHONET_PIPECTRLR
1162         int remote_pep;
1163         int pipe_handle;
1164 #endif
1165
1166         if (level != SOL_PNPIPE)
1167                 return -ENOPROTOOPT;
1168         if (optlen >= sizeof(int)) {
1169                 if (get_user(val, (int __user *) optval))
1170                         return -EFAULT;
1171         }
1172
1173         lock_sock(sk);
1174         switch (optname) {
1175 #ifdef CONFIG_PHONET_PIPECTRLR
1176         case PNPIPE_CREATE:
1177                 if (val) {
1178                         if (pn->pipe_state > PIPE_IDLE) {
1179                                 err = -EFAULT;
1180                                 break;
1181                         }
1182                         remote_pep = val & 0xFFFF;
1183                         pipe_handle =  (val >> 16) & 0xFF;
1184                         pn->remote_pep = remote_pep;
1185                         err = pipe_handler_create_pipe(sk, pipe_handle,
1186                                         PNPIPE_CREATE);
1187                         break;
1188                 }
1189
1190         case PNPIPE_ENABLE:
1191                 if (pn->pipe_state != PIPE_DISABLED) {
1192                         err = -EFAULT;
1193                         break;
1194                 }
1195                 err = pipe_handler_enable_pipe(sk, PNPIPE_ENABLE);
1196                 break;
1197
1198         case PNPIPE_DISABLE:
1199                 if (pn->pipe_state != PIPE_ENABLED) {
1200                         err = -EFAULT;
1201                         break;
1202                 }
1203
1204                 err = pipe_handler_enable_pipe(sk, PNPIPE_DISABLE);
1205                 break;
1206
1207         case PNPIPE_DESTROY:
1208                 if (pn->pipe_state < PIPE_DISABLED) {
1209                         err = -EFAULT;
1210                         break;
1211                 }
1212
1213                 err = pipe_handler_create_pipe(sk, 0x0, PNPIPE_DESTROY);
1214                 break;
1215 #endif
1216
1217         case PNPIPE_ENCAP:
1218                 if (val && val != PNPIPE_ENCAP_IP) {
1219                         err = -EINVAL;
1220                         break;
1221                 }
1222                 if (!pn->ifindex == !val)
1223                         break; /* Nothing to do! */
1224                 if (!capable(CAP_NET_ADMIN)) {
1225                         err = -EPERM;
1226                         break;
1227                 }
1228                 if (val) {
1229                         release_sock(sk);
1230                         err = gprs_attach(sk);
1231                         if (err > 0) {
1232                                 pn->ifindex = err;
1233                                 err = 0;
1234                         }
1235                 } else {
1236                         pn->ifindex = 0;
1237                         release_sock(sk);
1238                         gprs_detach(sk);
1239                         err = 0;
1240                 }
1241                 goto out_norel;
1242         default:
1243                 err = -ENOPROTOOPT;
1244         }
1245         release_sock(sk);
1246
1247 out_norel:
1248         return err;
1249 }
1250
1251 static int pep_getsockopt(struct sock *sk, int level, int optname,
1252                                 char __user *optval, int __user *optlen)
1253 {
1254         struct pep_sock *pn = pep_sk(sk);
1255         int len, val;
1256
1257         if (level != SOL_PNPIPE)
1258                 return -ENOPROTOOPT;
1259         if (get_user(len, optlen))
1260                 return -EFAULT;
1261
1262         switch (optname) {
1263         case PNPIPE_ENCAP:
1264                 val = pn->ifindex ? PNPIPE_ENCAP_IP : PNPIPE_ENCAP_NONE;
1265                 break;
1266
1267 #ifdef CONFIG_PHONET_PIPECTRLR
1268         case PNPIPE_INQ:
1269                 val = pn->pipe_state;
1270                 break;
1271 #endif
1272
1273         case PNPIPE_IFINDEX:
1274                 val = pn->ifindex;
1275                 break;
1276         default:
1277                 return -ENOPROTOOPT;
1278         }
1279
1280         len = min_t(unsigned int, sizeof(int), len);
1281         if (put_user(len, optlen))
1282                 return -EFAULT;
1283         if (put_user(val, (int __user *) optval))
1284                 return -EFAULT;
1285         return 0;
1286 }
1287
1288 static int pipe_skb_send(struct sock *sk, struct sk_buff *skb)
1289 {
1290         struct pep_sock *pn = pep_sk(sk);
1291         struct pnpipehdr *ph;
1292         int err;
1293 #ifdef CONFIG_PHONET_PIPECTRLR
1294         struct sockaddr_pn spn = {
1295                 .spn_family = AF_PHONET,
1296                 .spn_resource = 0xD9,
1297                 .spn_dev = pn_dev(pn->remote_pep),
1298                 .spn_obj = pn_obj(pn->remote_pep),
1299         };
1300 #endif
1301
1302         if (pn_flow_safe(pn->tx_fc) &&
1303             !atomic_add_unless(&pn->tx_credits, -1, 0)) {
1304                 kfree_skb(skb);
1305                 return -ENOBUFS;
1306         }
1307
1308         skb_push(skb, 3 + pn->aligned);
1309         skb_reset_transport_header(skb);
1310         ph = pnp_hdr(skb);
1311         ph->utid = 0;
1312         if (pn->aligned) {
1313                 ph->message_id = PNS_PIPE_ALIGNED_DATA;
1314                 ph->data[0] = 0; /* padding */
1315         } else
1316                 ph->message_id = PNS_PIPE_DATA;
1317         ph->pipe_handle = pn->pipe_handle;
1318 #ifdef CONFIG_PHONET_PIPECTRLR
1319         err = pn_skb_send(sk, skb, &spn);
1320 #else
1321         err = pn_skb_send(sk, skb, &pipe_srv);
1322 #endif
1323
1324         if (err && pn_flow_safe(pn->tx_fc))
1325                 atomic_inc(&pn->tx_credits);
1326         return err;
1327
1328 }
1329
1330 static int pep_sendmsg(struct kiocb *iocb, struct sock *sk,
1331                         struct msghdr *msg, size_t len)
1332 {
1333         struct pep_sock *pn = pep_sk(sk);
1334         struct sk_buff *skb;
1335         long timeo;
1336         int flags = msg->msg_flags;
1337         int err, done;
1338
1339         if ((msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|
1340                                 MSG_CMSG_COMPAT)) ||
1341                         !(msg->msg_flags & MSG_EOR))
1342                 return -EOPNOTSUPP;
1343
1344         skb = sock_alloc_send_skb(sk, MAX_PNPIPE_HEADER + len,
1345                                         flags & MSG_DONTWAIT, &err);
1346         if (!skb)
1347                 return err;
1348
1349         skb_reserve(skb, MAX_PHONET_HEADER + 3);
1350         err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
1351         if (err < 0)
1352                 goto outfree;
1353
1354         lock_sock(sk);
1355         timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1356         if ((1 << sk->sk_state) & (TCPF_LISTEN|TCPF_CLOSE)) {
1357                 err = -ENOTCONN;
1358                 goto out;
1359         }
1360         if (sk->sk_state != TCP_ESTABLISHED) {
1361                 /* Wait until the pipe gets to enabled state */
1362 disabled:
1363                 err = sk_stream_wait_connect(sk, &timeo);
1364                 if (err)
1365                         goto out;
1366
1367                 if (sk->sk_state == TCP_CLOSE_WAIT) {
1368                         err = -ECONNRESET;
1369                         goto out;
1370                 }
1371         }
1372         BUG_ON(sk->sk_state != TCP_ESTABLISHED);
1373
1374         /* Wait until flow control allows TX */
1375         done = atomic_read(&pn->tx_credits);
1376         while (!done) {
1377                 DEFINE_WAIT(wait);
1378
1379                 if (!timeo) {
1380                         err = -EAGAIN;
1381                         goto out;
1382                 }
1383                 if (signal_pending(current)) {
1384                         err = sock_intr_errno(timeo);
1385                         goto out;
1386                 }
1387
1388                 prepare_to_wait(sk_sleep(sk), &wait,
1389                                 TASK_INTERRUPTIBLE);
1390                 done = sk_wait_event(sk, &timeo, atomic_read(&pn->tx_credits));
1391                 finish_wait(sk_sleep(sk), &wait);
1392
1393                 if (sk->sk_state != TCP_ESTABLISHED)
1394                         goto disabled;
1395         }
1396
1397         err = pipe_skb_send(sk, skb);
1398         if (err >= 0)
1399                 err = len; /* success! */
1400         skb = NULL;
1401 out:
1402         release_sock(sk);
1403 outfree:
1404         kfree_skb(skb);
1405         return err;
1406 }
1407
1408 int pep_writeable(struct sock *sk)
1409 {
1410         struct pep_sock *pn = pep_sk(sk);
1411
1412         return atomic_read(&pn->tx_credits);
1413 }
1414
1415 int pep_write(struct sock *sk, struct sk_buff *skb)
1416 {
1417         struct sk_buff *rskb, *fs;
1418         int flen = 0;
1419
1420         if (pep_sk(sk)->aligned)
1421                 return pipe_skb_send(sk, skb);
1422
1423         rskb = alloc_skb(MAX_PNPIPE_HEADER, GFP_ATOMIC);
1424         if (!rskb) {
1425                 kfree_skb(skb);
1426                 return -ENOMEM;
1427         }
1428         skb_shinfo(rskb)->frag_list = skb;
1429         rskb->len += skb->len;
1430         rskb->data_len += rskb->len;
1431         rskb->truesize += rskb->len;
1432
1433         /* Avoid nested fragments */
1434         skb_walk_frags(skb, fs)
1435                 flen += fs->len;
1436         skb->next = skb_shinfo(skb)->frag_list;
1437         skb_frag_list_init(skb);
1438         skb->len -= flen;
1439         skb->data_len -= flen;
1440         skb->truesize -= flen;
1441
1442         skb_reserve(rskb, MAX_PHONET_HEADER + 3);
1443         return pipe_skb_send(sk, rskb);
1444 }
1445
1446 struct sk_buff *pep_read(struct sock *sk)
1447 {
1448         struct sk_buff *skb = skb_dequeue(&sk->sk_receive_queue);
1449
1450         if (sk->sk_state == TCP_ESTABLISHED)
1451                 pipe_grant_credits(sk);
1452         return skb;
1453 }
1454
1455 static int pep_recvmsg(struct kiocb *iocb, struct sock *sk,
1456                         struct msghdr *msg, size_t len, int noblock,
1457                         int flags, int *addr_len)
1458 {
1459         struct sk_buff *skb;
1460         int err;
1461
1462         if (flags & ~(MSG_OOB|MSG_PEEK|MSG_TRUNC|MSG_DONTWAIT|MSG_WAITALL|
1463                         MSG_NOSIGNAL|MSG_CMSG_COMPAT))
1464                 return -EOPNOTSUPP;
1465
1466         if (unlikely(1 << sk->sk_state & (TCPF_LISTEN | TCPF_CLOSE)))
1467                 return -ENOTCONN;
1468
1469         if ((flags & MSG_OOB) || sock_flag(sk, SOCK_URGINLINE)) {
1470                 /* Dequeue and acknowledge control request */
1471                 struct pep_sock *pn = pep_sk(sk);
1472
1473                 if (flags & MSG_PEEK)
1474                         return -EOPNOTSUPP;
1475                 skb = skb_dequeue(&pn->ctrlreq_queue);
1476                 if (skb) {
1477                         pep_ctrlreq_error(sk, skb, PN_PIPE_NO_ERROR,
1478                                                 GFP_KERNEL);
1479                         msg->msg_flags |= MSG_OOB;
1480                         goto copy;
1481                 }
1482                 if (flags & MSG_OOB)
1483                         return -EINVAL;
1484         }
1485
1486         skb = skb_recv_datagram(sk, flags, noblock, &err);
1487         lock_sock(sk);
1488         if (skb == NULL) {
1489                 if (err == -ENOTCONN && sk->sk_state == TCP_CLOSE_WAIT)
1490                         err = -ECONNRESET;
1491                 release_sock(sk);
1492                 return err;
1493         }
1494
1495         if (sk->sk_state == TCP_ESTABLISHED)
1496                 pipe_grant_credits(sk);
1497         release_sock(sk);
1498 copy:
1499         msg->msg_flags |= MSG_EOR;
1500         if (skb->len > len)
1501                 msg->msg_flags |= MSG_TRUNC;
1502         else
1503                 len = skb->len;
1504
1505         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len);
1506         if (!err)
1507                 err = (flags & MSG_TRUNC) ? skb->len : len;
1508
1509         skb_free_datagram(sk, skb);
1510         return err;
1511 }
1512
1513 static void pep_sock_unhash(struct sock *sk)
1514 {
1515         struct pep_sock *pn = pep_sk(sk);
1516         struct sock *skparent = NULL;
1517
1518         lock_sock(sk);
1519         if ((1 << sk->sk_state) & ~(TCPF_CLOSE|TCPF_LISTEN)) {
1520                 skparent = pn->listener;
1521                 release_sock(sk);
1522
1523                 pn = pep_sk(skparent);
1524                 lock_sock(skparent);
1525                 sk_del_node_init(sk);
1526                 sk = skparent;
1527         }
1528         /* Unhash a listening sock only when it is closed
1529          * and all of its active connected pipes are closed. */
1530         if (hlist_empty(&pn->hlist))
1531                 pn_sock_unhash(&pn->pn_sk.sk);
1532         release_sock(sk);
1533
1534         if (skparent)
1535                 sock_put(skparent);
1536 }
1537
1538 static struct proto pep_proto = {
1539         .close          = pep_sock_close,
1540         .accept         = pep_sock_accept,
1541         .ioctl          = pep_ioctl,
1542         .init           = pep_init,
1543         .setsockopt     = pep_setsockopt,
1544         .getsockopt     = pep_getsockopt,
1545         .sendmsg        = pep_sendmsg,
1546         .recvmsg        = pep_recvmsg,
1547         .backlog_rcv    = pep_do_rcv,
1548         .hash           = pn_sock_hash,
1549         .unhash         = pep_sock_unhash,
1550         .get_port       = pn_sock_get_port,
1551         .obj_size       = sizeof(struct pep_sock),
1552         .owner          = THIS_MODULE,
1553         .name           = "PNPIPE",
1554 };
1555
1556 static struct phonet_protocol pep_pn_proto = {
1557         .ops            = &phonet_stream_ops,
1558         .prot           = &pep_proto,
1559         .sock_type      = SOCK_SEQPACKET,
1560 };
1561
1562 static int __init pep_register(void)
1563 {
1564         return phonet_proto_register(PN_PROTO_PIPE, &pep_pn_proto);
1565 }
1566
1567 static void __exit pep_unregister(void)
1568 {
1569         phonet_proto_unregister(PN_PROTO_PIPE, &pep_pn_proto);
1570 }
1571
1572 module_init(pep_register);
1573 module_exit(pep_unregister);
1574 MODULE_AUTHOR("Remi Denis-Courmont, Nokia");
1575 MODULE_DESCRIPTION("Phonet pipe protocol");
1576 MODULE_LICENSE("GPL");
1577 MODULE_ALIAS_NET_PF_PROTO(PF_PHONET, PN_PROTO_PIPE);