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