4 * Phonet pipe protocol end point socket
6 * Copyright (C) 2008 Nokia Corporation.
8 * Author: RĂ©mi Denis-Courmont
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.
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.
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
25 #include <linux/kernel.h>
26 #include <linux/sched/signal.h>
27 #include <linux/slab.h>
28 #include <linux/socket.h>
30 #include <net/tcp_states.h>
31 #include <asm/ioctls.h>
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>
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
47 * - sk_state, hlist: sock lock needed
48 * - listener: read only
49 * - pipe_handle: read only
52 #define CREDITS_MAX 10
55 #define pep_sb_size(s) (((s) + 5) & ~3) /* 2-bytes head, 32-bits aligned */
57 /* Get the next TLV sub-block. */
58 static unsigned char *pep_get_sb(struct sk_buff *skb, u8 *ptype, u8 *plen,
68 ph = skb_header_pointer(skb, 0, 2, &h);
69 if (ph == NULL || ph->sb_len < 2 || !pskb_may_pull(skb, ph->sb_len))
75 if (buflen > ph->sb_len)
77 data = skb_header_pointer(skb, 2, buflen, buf);
78 __skb_pull(skb, 2 + ph->sb_len);
82 static struct sk_buff *pep_alloc_skb(struct sock *sk, const void *payload,
83 int len, gfp_t priority)
85 struct sk_buff *skb = alloc_skb(MAX_PNPIPE_HEADER + len, priority);
88 skb_set_owner_w(skb, sk);
90 skb_reserve(skb, MAX_PNPIPE_HEADER);
92 skb_copy_to_linear_data(skb, payload, len);
93 __skb_push(skb, sizeof(struct pnpipehdr));
94 skb_reset_transport_header(skb);
98 static int pep_reply(struct sock *sk, struct sk_buff *oskb, u8 code,
99 const void *data, int len, gfp_t priority)
101 const struct pnpipehdr *oph = pnp_hdr(oskb);
102 struct pnpipehdr *ph;
104 struct sockaddr_pn peer;
106 skb = pep_alloc_skb(sk, data, len, priority);
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;
116 pn_skb_get_src_sockaddr(oskb, &peer);
117 return pn_skb_send(sk, skb, &peer);
120 static int pep_indicate(struct sock *sk, u8 id, u8 code,
121 const void *data, int len, gfp_t priority)
123 struct pep_sock *pn = pep_sk(sk);
124 struct pnpipehdr *ph;
127 skb = pep_alloc_skb(sk, data, len, priority);
134 ph->pipe_handle = pn->pipe_handle;
136 return pn_skb_send(sk, skb, NULL);
141 static int pipe_handler_request(struct sock *sk, u8 id, u8 code,
142 const void *data, int len)
144 struct pep_sock *pn = pep_sk(sk);
145 struct pnpipehdr *ph;
148 skb = pep_alloc_skb(sk, data, len, GFP_KERNEL);
153 ph->utid = id; /* whatever */
155 ph->pipe_handle = pn->pipe_handle;
157 return pn_skb_send(sk, skb, NULL);
160 static int pipe_handler_send_created_ind(struct sock *sk)
162 struct pep_sock *pn = pep_sk(sk);
164 PN_PIPE_SB_NEGOTIATED_FC, pep_sb_size(2),
165 pn->tx_fc, pn->rx_fc,
168 return pep_indicate(sk, PNS_PIPE_CREATED_IND, 1 /* sub-blocks */,
169 data, 4, GFP_ATOMIC);
172 static int pep_accept_conn(struct sock *sk, struct sk_buff *skb)
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,
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,
189 return pep_reply(sk, skb, PN_PIPE_NO_ERROR, data, sizeof(data),
193 static int pep_reject_conn(struct sock *sk, struct sk_buff *skb, u8 code,
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);
201 /* Control requests are not sent by the pipe service and have a specific
203 static int pep_ctrlreq_error(struct sock *sk, struct sk_buff *oskb, u8 code,
206 const struct pnpipehdr *oph = pnp_hdr(oskb);
208 struct pnpipehdr *ph;
209 struct sockaddr_pn dst;
211 oph->data[0], /* PEP type */
212 code, /* error code, at an unusual offset */
216 skb = pep_alloc_skb(sk, data, 4, priority);
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 */
226 pn_skb_get_src_sockaddr(oskb, &dst);
227 return pn_skb_send(sk, skb, &dst);
230 static int pipe_snd_status(struct sock *sk, u8 type, u8 status, gfp_t priority)
232 u8 data[4] = { type, PAD, PAD, status };
234 return pep_indicate(sk, PNS_PEP_STATUS_IND, PN_PEP_TYPE_COMMON,
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)
242 struct pep_sock *pn = pep_sk(sk);
244 BUG_ON(sk->sk_state != TCP_ESTABLISHED);
247 case PN_LEGACY_FLOW_CONTROL: /* TODO */
249 case PN_ONE_CREDIT_FLOW_CONTROL:
250 if (pipe_snd_status(sk, PN_PEP_IND_FLOW_CONTROL,
251 PEP_IND_READY, priority) == 0)
254 case PN_MULTI_CREDIT_FLOW_CONTROL:
255 if ((pn->rx_credits + CREDITS_THR) > CREDITS_MAX)
257 if (pipe_snd_status(sk, PN_PEP_IND_ID_MCFC_GRANT_CREDITS,
258 CREDITS_MAX - pn->rx_credits,
260 pn->rx_credits = CREDITS_MAX;
265 static int pipe_rcv_status(struct sock *sk, struct sk_buff *skb)
267 struct pep_sock *pn = pep_sk(sk);
268 struct pnpipehdr *hdr;
271 if (!pskb_may_pull(skb, sizeof(*hdr) + 4))
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]);
281 switch (hdr->data[1]) {
282 case PN_PEP_IND_FLOW_CONTROL:
284 case PN_LEGACY_FLOW_CONTROL:
285 switch (hdr->data[4]) {
287 atomic_set(&pn->tx_credits, 0);
290 atomic_set(&pn->tx_credits, wake = 1);
294 case PN_ONE_CREDIT_FLOW_CONTROL:
295 if (hdr->data[4] == PEP_IND_READY)
296 atomic_set(&pn->tx_credits, wake = 1);
301 case PN_PEP_IND_ID_MCFC_GRANT_CREDITS:
302 if (pn->tx_fc != PN_MULTI_CREDIT_FLOW_CONTROL)
304 atomic_add(wake = hdr->data[4], &pn->tx_credits);
308 net_dbg_ratelimited("Phonet unknown PEP indication: %u\n",
309 (unsigned int)hdr->data[1]);
313 sk->sk_write_space(sk);
317 static int pipe_rcv_created(struct sock *sk, struct sk_buff *skb)
319 struct pep_sock *pn = pep_sk(sk);
320 struct pnpipehdr *hdr = pnp_hdr(skb);
321 u8 n_sb = hdr->data[0];
323 pn->rx_fc = pn->tx_fc = PN_LEGACY_FLOW_CONTROL;
324 __skb_pull(skb, sizeof(*hdr));
326 u8 type, buf[2], len = sizeof(buf);
327 u8 *data = pep_get_sb(skb, &type, &len, buf);
332 case PN_PIPE_SB_NEGOTIATED_FC:
333 if (len < 2 || (data[0] | data[1]) > 3)
335 pn->tx_fc = data[0] & 3;
336 pn->rx_fc = data[1] & 3;
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)
348 struct pep_sock *pn = pep_sk(sk);
349 struct pnpipehdr *hdr = pnp_hdr(skb);
350 struct sk_buff_head *queue;
353 BUG_ON(sk->sk_state == TCP_CLOSE_WAIT);
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);
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);
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);
372 case PNS_PEP_RESET_REQ:
373 switch (hdr->state_after_reset) {
374 case PN_PIPE_DISABLE:
380 default: /* not allowed to send an error here!? */
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);
390 case PNS_PEP_CTRL_REQ:
391 if (skb_queue_len(&pn->ctrlreq_queue) >= PNPIPE_CTRLREQ_MAX) {
392 atomic_inc(&sk->sk_drops);
396 queue = &pn->ctrlreq_queue;
399 case PNS_PIPE_ALIGNED_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);
407 return NET_RX_SUCCESS;
412 if (pn->rx_credits == 0) {
413 atomic_inc(&sk->sk_drops);
418 queue = &sk->sk_receive_queue;
421 case PNS_PEP_STATUS_IND:
422 pipe_rcv_status(sk, skb);
425 case PNS_PIPE_REDIRECTED_IND:
426 err = pipe_rcv_created(sk, skb);
429 case PNS_PIPE_CREATED_IND:
430 err = pipe_rcv_created(sk, skb);
434 case PNS_PIPE_RESET_IND:
435 if (!pn->init_enable)
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);
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);
449 case PNS_PIPE_DISABLED_IND:
450 sk->sk_state = TCP_SYN_RECV;
455 net_dbg_ratelimited("Phonet unknown PEP message: %u\n",
461 return (err == -ENOBUFS) ? NET_RX_DROP : NET_RX_SUCCESS;
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;
472 /* Destroy connected sock. */
473 static void pipe_destruct(struct sock *sk)
475 struct pep_sock *pn = pep_sk(sk);
477 skb_queue_purge(&sk->sk_receive_queue);
478 skb_queue_purge(&pn->ctrlreq_queue);
481 static u8 pipe_negotiate_fc(const u8 *fcs, unsigned int n)
484 u8 final_fc = PN_NO_FLOW_CONTROL;
486 for (i = 0; i < n; i++) {
489 if (fc > final_fc && fc < PN_MAX_FLOW_CONTROL)
495 static int pep_connresp_rcv(struct sock *sk, struct sk_buff *skb)
497 struct pep_sock *pn = pep_sk(sk);
498 struct pnpipehdr *hdr;
501 if (!pskb_pull(skb, sizeof(*hdr) + 4))
505 if (hdr->error_code != PN_PIPE_NO_ERROR)
506 return -ECONNREFUSED;
508 /* Parse sub-blocks */
511 u8 type, buf[6], len = sizeof(buf);
512 const u8 *data = pep_get_sb(skb, &type, &len, buf);
518 case PN_PIPE_SB_REQUIRED_FC_TX:
519 if (len < 2 || len < data[0])
521 pn->tx_fc = pipe_negotiate_fc(data + 2, len - 2);
524 case PN_PIPE_SB_PREFERRED_FC_RX:
525 if (len < 2 || len < data[0])
527 pn->rx_fc = pipe_negotiate_fc(data + 2, len - 2);
534 return pipe_handler_send_created_ind(sk);
537 static int pep_enableresp_rcv(struct sock *sk, struct sk_buff *skb)
539 struct pnpipehdr *hdr = pnp_hdr(skb);
541 if (hdr->error_code != PN_PIPE_NO_ERROR)
542 return -ECONNREFUSED;
544 return pep_indicate(sk, PNS_PIPE_ENABLED_IND, 0 /* sub-blocks */,
545 NULL, 0, GFP_ATOMIC);
549 static void pipe_start_flow_control(struct sock *sk)
551 struct pep_sock *pn = pep_sk(sk);
553 if (!pn_flow_safe(pn->tx_fc)) {
554 atomic_set(&pn->tx_credits, 1);
555 sk->sk_write_space(sk);
557 pipe_grant_credits(sk, GFP_ATOMIC);
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)
564 struct pep_sock *pn = pep_sk(sk);
565 struct pnpipehdr *hdr = pnp_hdr(skb);
566 int err = NET_RX_SUCCESS;
568 switch (hdr->message_id) {
569 case PNS_PIPE_ALIGNED_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);
577 return NET_RX_SUCCESS;
582 if (pn->rx_credits == 0) {
583 atomic_inc(&sk->sk_drops);
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;
595 case PNS_PEP_CONNECT_RESP:
596 if (sk->sk_state != TCP_SYN_SENT)
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;
604 if (pn->init_enable == PN_PIPE_DISABLE)
605 sk->sk_state = TCP_SYN_RECV;
607 sk->sk_state = TCP_ESTABLISHED;
608 pipe_start_flow_control(sk);
612 case PNS_PEP_ENABLE_RESP:
613 if (sk->sk_state != TCP_SYN_SENT)
616 if (pep_enableresp_rcv(sk, skb)) {
617 sk->sk_state = TCP_CLOSE_WAIT;
621 sk->sk_state = TCP_ESTABLISHED;
622 pipe_start_flow_control(sk);
625 case PNS_PEP_DISCONNECT_RESP:
626 /* sock should already be dead, nothing to do */
629 case PNS_PEP_STATUS_IND:
630 pipe_rcv_status(sk, skb);
637 /* Listening sock must be locked */
638 static struct sock *pep_find_pipe(const struct hlist_head *hlist,
639 const struct sockaddr_pn *dst,
643 u16 dobj = pn_sockaddr_get_object(dst);
645 sk_for_each(sknode, hlist) {
646 struct pep_sock *pnnode = pep_sk(sknode);
648 /* Ports match, but addresses might not: */
649 if (pnnode->pn_sk.sobject != dobj)
651 if (pnnode->pipe_handle != pipe_handle)
653 if (sknode->sk_state == TCP_CLOSE_WAIT)
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).
667 static int pep_do_rcv(struct sock *sk, struct sk_buff *skb)
669 struct pep_sock *pn = pep_sk(sk);
671 struct pnpipehdr *hdr;
672 struct sockaddr_pn dst;
675 if (!pskb_may_pull(skb, sizeof(*hdr)))
679 pipe_handle = hdr->pipe_handle;
680 if (pipe_handle == PN_PIPE_INVALID_HANDLE)
683 pn_skb_get_dst_sockaddr(skb, &dst);
685 /* Look for an existing pipe handle */
686 sknode = pep_find_pipe(&pn->hlist, &dst, pipe_handle);
688 return sk_receive_skb(sknode, skb, 1);
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,
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;
703 case PNS_PEP_DISCONNECT_REQ:
704 pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
707 case PNS_PEP_CTRL_REQ:
708 pep_ctrlreq_error(sk, skb, PN_PIPE_INVALID_HANDLE, GFP_ATOMIC);
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! */
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);
725 return NET_RX_SUCCESS;
728 static int pipe_do_remove(struct sock *sk)
730 struct pep_sock *pn = pep_sk(sk);
731 struct pnpipehdr *ph;
734 skb = pep_alloc_skb(sk, NULL, 0, GFP_KERNEL);
740 ph->message_id = PNS_PIPE_REMOVE_REQ;
741 ph->pipe_handle = pn->pipe_handle;
743 return pn_skb_send(sk, skb, NULL);
746 /* associated socket ceases to exist */
747 static void pep_sock_close(struct sock *sk, long timeout)
749 struct pep_sock *pn = pep_sk(sk);
752 sock_hold(sk); /* keep a reference after sk_common_release() */
753 sk_common_release(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 */
761 pipe_handler_request(sk, PNS_PEP_DISCONNECT_REQ, PAD,
764 sk->sk_state = TCP_CLOSE;
766 ifindex = pn->ifindex;
775 static struct sock *pep_sock_accept(struct sock *sk, int flags, int *errp)
777 struct pep_sock *pn = pep_sk(sk), *newpn;
778 struct sock *newsk = NULL;
780 struct pnpipehdr *hdr;
781 struct sockaddr_pn dst, src;
784 u8 pipe_handle, enabled, n_sb;
787 skb = skb_recv_datagram(sk, 0, flags & O_NONBLOCK, errp);
792 if (sk->sk_state != TCP_LISTEN) {
796 sk_acceptq_removed(sk);
799 if (!pskb_may_pull(skb, sizeof(*hdr) + 4))
803 pipe_handle = hdr->pipe_handle;
804 switch (hdr->state_after_connect) {
805 case PN_PIPE_DISABLE:
812 pep_reject_conn(sk, skb, PN_PIPE_ERR_INVALID_PARAM,
816 peer_type = hdr->other_pep_type << 8;
818 /* Parse sub-blocks (options) */
821 u8 type, buf[1], len = sizeof(buf);
822 const u8 *data = pep_get_sb(skb, &type, &len, buf);
827 case PN_PIPE_SB_CONNECT_REQ_PEP_SUB_TYPE:
830 peer_type = (peer_type & 0xff00) | data[0];
832 case PN_PIPE_SB_ALIGNED_DATA:
833 aligned = data[0] != 0;
839 /* Check for duplicate pipe handle */
840 newsk = pep_find_pipe(&pn->hlist, &dst, pipe_handle);
841 if (unlikely(newsk)) {
844 pep_reject_conn(sk, skb, PN_PIPE_ERR_PEP_IN_USE, GFP_KERNEL);
848 /* Create a new to-be-accepted sock */
849 newsk = sk_alloc(sock_net(sk), PF_PHONET, GFP_KERNEL, sk->sk_prot, 0);
851 pep_reject_conn(sk, skb, PN_PIPE_ERR_OVERLOAD, GFP_KERNEL);
856 sock_init_data(NULL, newsk);
857 newsk->sk_state = TCP_SYN_RECV;
858 newsk->sk_backlog_rcv = pipe_do_rcv;
859 newsk->sk_protocol = sk->sk_protocol;
860 newsk->sk_destruct = pipe_destruct;
862 newpn = pep_sk(newsk);
863 pn_skb_get_dst_sockaddr(skb, &dst);
864 pn_skb_get_src_sockaddr(skb, &src);
865 newpn->pn_sk.sobject = pn_sockaddr_get_object(&dst);
866 newpn->pn_sk.dobject = pn_sockaddr_get_object(&src);
867 newpn->pn_sk.resource = pn_sockaddr_get_resource(&dst);
869 newpn->listener = sk;
870 skb_queue_head_init(&newpn->ctrlreq_queue);
871 newpn->pipe_handle = pipe_handle;
872 atomic_set(&newpn->tx_credits, 0);
874 newpn->peer_type = peer_type;
875 newpn->rx_credits = 0;
876 newpn->rx_fc = newpn->tx_fc = PN_LEGACY_FLOW_CONTROL;
877 newpn->init_enable = enabled;
878 newpn->aligned = aligned;
880 err = pep_accept_conn(newsk, skb);
886 sk_add_node(newsk, &pn->hlist);
894 static int pep_sock_connect(struct sock *sk, struct sockaddr *addr, int len)
896 struct pep_sock *pn = pep_sk(sk);
898 u8 data[4] = { 0 /* sub-blocks */, PAD, PAD, PAD };
900 if (pn->pipe_handle == PN_PIPE_INVALID_HANDLE)
901 pn->pipe_handle = 1; /* anything but INVALID_HANDLE */
903 err = pipe_handler_request(sk, PNS_PEP_CONNECT_REQ,
904 pn->init_enable, data, 4);
906 pn->pipe_handle = PN_PIPE_INVALID_HANDLE;
910 sk->sk_state = TCP_SYN_SENT;
915 static int pep_sock_enable(struct sock *sk, struct sockaddr *addr, int len)
919 err = pipe_handler_request(sk, PNS_PEP_ENABLE_REQ, PAD,
924 sk->sk_state = TCP_SYN_SENT;
929 static int pep_ioctl(struct sock *sk, int cmd, unsigned long arg)
931 struct pep_sock *pn = pep_sk(sk);
933 int ret = -ENOIOCTLCMD;
937 if (sk->sk_state == TCP_LISTEN) {
943 if (sock_flag(sk, SOCK_URGINLINE) &&
944 !skb_queue_empty(&pn->ctrlreq_queue))
945 answ = skb_peek(&pn->ctrlreq_queue)->len;
946 else if (!skb_queue_empty(&sk->sk_receive_queue))
947 answ = skb_peek(&sk->sk_receive_queue)->len;
951 ret = put_user(answ, (int __user *)arg);
954 case SIOCPNENABLEPIPE:
956 if (sk->sk_state == TCP_SYN_SENT)
958 else if (sk->sk_state == TCP_ESTABLISHED)
961 ret = pep_sock_enable(sk, NULL, 0);
969 static int pep_init(struct sock *sk)
971 struct pep_sock *pn = pep_sk(sk);
973 sk->sk_destruct = pipe_destruct;
974 INIT_HLIST_HEAD(&pn->hlist);
976 skb_queue_head_init(&pn->ctrlreq_queue);
977 atomic_set(&pn->tx_credits, 0);
980 pn->pipe_handle = PN_PIPE_INVALID_HANDLE;
982 pn->rx_fc = pn->tx_fc = PN_LEGACY_FLOW_CONTROL;
988 static int pep_setsockopt(struct sock *sk, int level, int optname,
989 char __user *optval, unsigned int optlen)
991 struct pep_sock *pn = pep_sk(sk);
992 int val = 0, err = 0;
994 if (level != SOL_PNPIPE)
996 if (optlen >= sizeof(int)) {
997 if (get_user(val, (int __user *) optval))
1004 if (val && val != PNPIPE_ENCAP_IP) {
1008 if (!pn->ifindex == !val)
1009 break; /* Nothing to do! */
1010 if (!capable(CAP_NET_ADMIN)) {
1016 err = gprs_attach(sk);
1030 if ((sk->sk_state == TCP_CLOSE) &&
1031 (val >= 0) && (val < PN_PIPE_INVALID_HANDLE))
1032 pn->pipe_handle = val;
1037 case PNPIPE_INITSTATE:
1038 pn->init_enable = !!val;
1050 static int pep_getsockopt(struct sock *sk, int level, int optname,
1051 char __user *optval, int __user *optlen)
1053 struct pep_sock *pn = pep_sk(sk);
1056 if (level != SOL_PNPIPE)
1057 return -ENOPROTOOPT;
1058 if (get_user(len, optlen))
1063 val = pn->ifindex ? PNPIPE_ENCAP_IP : PNPIPE_ENCAP_NONE;
1066 case PNPIPE_IFINDEX:
1071 val = pn->pipe_handle;
1072 if (val == PN_PIPE_INVALID_HANDLE)
1076 case PNPIPE_INITSTATE:
1077 val = pn->init_enable;
1081 return -ENOPROTOOPT;
1084 len = min_t(unsigned int, sizeof(int), len);
1085 if (put_user(len, optlen))
1087 if (put_user(val, (int __user *) optval))
1092 static int pipe_skb_send(struct sock *sk, struct sk_buff *skb)
1094 struct pep_sock *pn = pep_sk(sk);
1095 struct pnpipehdr *ph;
1098 if (pn_flow_safe(pn->tx_fc) &&
1099 !atomic_add_unless(&pn->tx_credits, -1, 0)) {
1104 skb_push(skb, 3 + pn->aligned);
1105 skb_reset_transport_header(skb);
1109 ph->message_id = PNS_PIPE_ALIGNED_DATA;
1110 ph->data[0] = 0; /* padding */
1112 ph->message_id = PNS_PIPE_DATA;
1113 ph->pipe_handle = pn->pipe_handle;
1114 err = pn_skb_send(sk, skb, NULL);
1116 if (err && pn_flow_safe(pn->tx_fc))
1117 atomic_inc(&pn->tx_credits);
1122 static int pep_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
1124 struct pep_sock *pn = pep_sk(sk);
1125 struct sk_buff *skb;
1127 int flags = msg->msg_flags;
1130 if (len > USHRT_MAX)
1133 if ((msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|
1134 MSG_CMSG_COMPAT)) ||
1135 !(msg->msg_flags & MSG_EOR))
1138 skb = sock_alloc_send_skb(sk, MAX_PNPIPE_HEADER + len,
1139 flags & MSG_DONTWAIT, &err);
1143 skb_reserve(skb, MAX_PHONET_HEADER + 3 + pn->aligned);
1144 err = memcpy_from_msg(skb_put(skb, len), msg, len);
1149 timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1150 if ((1 << sk->sk_state) & (TCPF_LISTEN|TCPF_CLOSE)) {
1154 if (sk->sk_state != TCP_ESTABLISHED) {
1155 /* Wait until the pipe gets to enabled state */
1157 err = sk_stream_wait_connect(sk, &timeo);
1161 if (sk->sk_state == TCP_CLOSE_WAIT) {
1166 BUG_ON(sk->sk_state != TCP_ESTABLISHED);
1168 /* Wait until flow control allows TX */
1169 done = atomic_read(&pn->tx_credits);
1171 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1177 if (signal_pending(current)) {
1178 err = sock_intr_errno(timeo);
1182 add_wait_queue(sk_sleep(sk), &wait);
1183 done = sk_wait_event(sk, &timeo, atomic_read(&pn->tx_credits), &wait);
1184 remove_wait_queue(sk_sleep(sk), &wait);
1186 if (sk->sk_state != TCP_ESTABLISHED)
1190 err = pipe_skb_send(sk, skb);
1192 err = len; /* success! */
1201 int pep_writeable(struct sock *sk)
1203 struct pep_sock *pn = pep_sk(sk);
1205 return atomic_read(&pn->tx_credits);
1208 int pep_write(struct sock *sk, struct sk_buff *skb)
1210 struct sk_buff *rskb, *fs;
1213 if (pep_sk(sk)->aligned)
1214 return pipe_skb_send(sk, skb);
1216 rskb = alloc_skb(MAX_PNPIPE_HEADER, GFP_ATOMIC);
1221 skb_shinfo(rskb)->frag_list = skb;
1222 rskb->len += skb->len;
1223 rskb->data_len += rskb->len;
1224 rskb->truesize += rskb->len;
1226 /* Avoid nested fragments */
1227 skb_walk_frags(skb, fs)
1229 skb->next = skb_shinfo(skb)->frag_list;
1230 skb_frag_list_init(skb);
1232 skb->data_len -= flen;
1233 skb->truesize -= flen;
1235 skb_reserve(rskb, MAX_PHONET_HEADER + 3);
1236 return pipe_skb_send(sk, rskb);
1239 struct sk_buff *pep_read(struct sock *sk)
1241 struct sk_buff *skb = skb_dequeue(&sk->sk_receive_queue);
1243 if (sk->sk_state == TCP_ESTABLISHED)
1244 pipe_grant_credits(sk, GFP_ATOMIC);
1248 static int pep_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
1249 int noblock, int flags, int *addr_len)
1251 struct sk_buff *skb;
1254 if (flags & ~(MSG_OOB|MSG_PEEK|MSG_TRUNC|MSG_DONTWAIT|MSG_WAITALL|
1255 MSG_NOSIGNAL|MSG_CMSG_COMPAT))
1258 if (unlikely(1 << sk->sk_state & (TCPF_LISTEN | TCPF_CLOSE)))
1261 if ((flags & MSG_OOB) || sock_flag(sk, SOCK_URGINLINE)) {
1262 /* Dequeue and acknowledge control request */
1263 struct pep_sock *pn = pep_sk(sk);
1265 if (flags & MSG_PEEK)
1267 skb = skb_dequeue(&pn->ctrlreq_queue);
1269 pep_ctrlreq_error(sk, skb, PN_PIPE_NO_ERROR,
1271 msg->msg_flags |= MSG_OOB;
1274 if (flags & MSG_OOB)
1278 skb = skb_recv_datagram(sk, flags, noblock, &err);
1281 if (err == -ENOTCONN && sk->sk_state == TCP_CLOSE_WAIT)
1287 if (sk->sk_state == TCP_ESTABLISHED)
1288 pipe_grant_credits(sk, GFP_KERNEL);
1291 msg->msg_flags |= MSG_EOR;
1293 msg->msg_flags |= MSG_TRUNC;
1297 err = skb_copy_datagram_msg(skb, 0, msg, len);
1299 err = (flags & MSG_TRUNC) ? skb->len : len;
1301 skb_free_datagram(sk, skb);
1305 static void pep_sock_unhash(struct sock *sk)
1307 struct pep_sock *pn = pep_sk(sk);
1308 struct sock *skparent = NULL;
1312 if (pn->listener != NULL) {
1313 skparent = pn->listener;
1314 pn->listener = NULL;
1317 pn = pep_sk(skparent);
1318 lock_sock(skparent);
1319 sk_del_node_init(sk);
1323 /* Unhash a listening sock only when it is closed
1324 * and all of its active connected pipes are closed. */
1325 if (hlist_empty(&pn->hlist))
1326 pn_sock_unhash(&pn->pn_sk.sk);
1333 static struct proto pep_proto = {
1334 .close = pep_sock_close,
1335 .accept = pep_sock_accept,
1336 .connect = pep_sock_connect,
1339 .setsockopt = pep_setsockopt,
1340 .getsockopt = pep_getsockopt,
1341 .sendmsg = pep_sendmsg,
1342 .recvmsg = pep_recvmsg,
1343 .backlog_rcv = pep_do_rcv,
1344 .hash = pn_sock_hash,
1345 .unhash = pep_sock_unhash,
1346 .get_port = pn_sock_get_port,
1347 .obj_size = sizeof(struct pep_sock),
1348 .owner = THIS_MODULE,
1352 static struct phonet_protocol pep_pn_proto = {
1353 .ops = &phonet_stream_ops,
1355 .sock_type = SOCK_SEQPACKET,
1358 static int __init pep_register(void)
1360 return phonet_proto_register(PN_PROTO_PIPE, &pep_pn_proto);
1363 static void __exit pep_unregister(void)
1365 phonet_proto_unregister(PN_PROTO_PIPE, &pep_pn_proto);
1368 module_init(pep_register);
1369 module_exit(pep_unregister);
1370 MODULE_AUTHOR("Remi Denis-Courmont, Nokia");
1371 MODULE_DESCRIPTION("Phonet pipe protocol");
1372 MODULE_LICENSE("GPL");
1373 MODULE_ALIAS_NET_PF_PROTO(PF_PHONET, PN_PROTO_PIPE);