4 * Phonet pipe protocol end point socket
6 * Copyright (C) 2008 Nokia Corporation.
8 * Author: RĂ©mi Denis-Courmont <remi.denis-courmont@nokia.com>
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/socket.h>
28 #include <net/tcp_states.h>
29 #include <asm/ioctls.h>
31 #include <linux/phonet.h>
32 #include <net/phonet/phonet.h>
33 #include <net/phonet/pep.h>
34 #include <net/phonet/gprs.h>
37 * TCP_CLOSE sock not in use yet
38 * TCP_CLOSE_WAIT disconnected pipe
39 * TCP_LISTEN listening pipe endpoint
40 * TCP_SYN_RECV connected pipe in disabled state
41 * TCP_ESTABLISHED connected pipe in enabled state
44 * - sk_state, ackq, hlist: sock lock needed
45 * - listener: read only
46 * - pipe_handle: read only
49 #define CREDITS_MAX 10
52 static const struct sockaddr_pn pipe_srv = {
53 .spn_family = AF_PHONET,
54 .spn_resource = 0xD9, /* pipe service */
57 #define pep_sb_size(s) (((s) + 5) & ~3) /* 2-bytes head, 32-bits aligned */
59 /* Get the next TLV sub-block. */
60 static unsigned char *pep_get_sb(struct sk_buff *skb, u8 *ptype, u8 *plen,
70 ph = skb_header_pointer(skb, 0, 2, &h);
71 if (ph == NULL || ph->sb_len < 2 || !pskb_may_pull(skb, ph->sb_len))
77 if (buflen > ph->sb_len)
79 data = skb_header_pointer(skb, 2, buflen, buf);
80 __skb_pull(skb, 2 + ph->sb_len);
84 static int pep_reply(struct sock *sk, struct sk_buff *oskb,
85 u8 code, const void *data, int len, gfp_t priority)
87 const struct pnpipehdr *oph = pnp_hdr(oskb);
91 skb = alloc_skb(MAX_PNPIPE_HEADER + len, priority);
94 skb_set_owner_w(skb, sk);
96 skb_reserve(skb, MAX_PNPIPE_HEADER);
98 skb_copy_to_linear_data(skb, data, len);
99 __skb_push(skb, sizeof(*ph));
100 skb_reset_transport_header(skb);
102 ph->utid = oph->utid;
103 ph->message_id = oph->message_id + 1; /* REQ -> RESP */
104 ph->pipe_handle = oph->pipe_handle;
105 ph->error_code = code;
107 return pn_skb_send(sk, skb, &pipe_srv);
111 static int pep_accept_conn(struct sock *sk, struct sk_buff *skb)
113 static const u8 data[20] = {
114 PAD, PAD, PAD, 2 /* sub-blocks */,
115 PN_PIPE_SB_REQUIRED_FC_TX, pep_sb_size(5), 3, PAD,
116 PN_MULTI_CREDIT_FLOW_CONTROL,
117 PN_ONE_CREDIT_FLOW_CONTROL,
118 PN_LEGACY_FLOW_CONTROL,
120 PN_PIPE_SB_PREFERRED_FC_RX, pep_sb_size(5), 3, PAD,
121 PN_MULTI_CREDIT_FLOW_CONTROL,
122 PN_ONE_CREDIT_FLOW_CONTROL,
123 PN_LEGACY_FLOW_CONTROL,
128 return pep_reply(sk, skb, PN_PIPE_NO_ERROR, data, sizeof(data),
132 static int pep_reject_conn(struct sock *sk, struct sk_buff *skb, u8 code)
134 static const u8 data[4] = { PAD, PAD, PAD, 0 /* sub-blocks */ };
135 WARN_ON(code == PN_PIPE_NO_ERROR);
136 return pep_reply(sk, skb, code, data, sizeof(data), GFP_ATOMIC);
139 /* Control requests are not sent by the pipe service and have a specific
141 static int pep_ctrlreq_error(struct sock *sk, struct sk_buff *oskb, u8 code,
144 const struct pnpipehdr *oph = pnp_hdr(oskb);
146 struct pnpipehdr *ph;
147 struct sockaddr_pn dst;
149 skb = alloc_skb(MAX_PNPIPE_HEADER + 4, priority);
152 skb_set_owner_w(skb, sk);
154 skb_reserve(skb, MAX_PHONET_HEADER);
155 ph = (struct pnpipehdr *)skb_put(skb, sizeof(*ph) + 4);
157 ph->utid = oph->utid;
158 ph->message_id = PNS_PEP_CTRL_RESP;
159 ph->pipe_handle = oph->pipe_handle;
160 ph->data[0] = oph->data[1]; /* CTRL id */
161 ph->data[1] = oph->data[0]; /* PEP type */
162 ph->data[2] = code; /* error code, at an usual offset */
166 pn_skb_get_src_sockaddr(oskb, &dst);
167 return pn_skb_send(sk, skb, &dst);
170 static int pipe_snd_status(struct sock *sk, u8 type, u8 status, gfp_t priority)
172 struct pep_sock *pn = pep_sk(sk);
173 struct pnpipehdr *ph;
176 skb = alloc_skb(MAX_PNPIPE_HEADER + 4, priority);
179 skb_set_owner_w(skb, sk);
181 skb_reserve(skb, MAX_PNPIPE_HEADER + 4);
182 __skb_push(skb, sizeof(*ph) + 4);
183 skb_reset_transport_header(skb);
186 ph->message_id = PNS_PEP_STATUS_IND;
187 ph->pipe_handle = pn->pipe_handle;
188 ph->pep_type = PN_PEP_TYPE_COMMON;
192 ph->data[4] = status;
194 return pn_skb_send(sk, skb, &pipe_srv);
197 /* Send our RX flow control information to the sender.
198 * Socket must be locked. */
199 static void pipe_grant_credits(struct sock *sk)
201 struct pep_sock *pn = pep_sk(sk);
203 BUG_ON(sk->sk_state != TCP_ESTABLISHED);
206 case PN_LEGACY_FLOW_CONTROL: /* TODO */
208 case PN_ONE_CREDIT_FLOW_CONTROL:
209 pipe_snd_status(sk, PN_PEP_IND_FLOW_CONTROL,
210 PEP_IND_READY, GFP_ATOMIC);
213 case PN_MULTI_CREDIT_FLOW_CONTROL:
214 if ((pn->rx_credits + CREDITS_THR) > CREDITS_MAX)
216 if (pipe_snd_status(sk, PN_PEP_IND_ID_MCFC_GRANT_CREDITS,
217 CREDITS_MAX - pn->rx_credits,
219 pn->rx_credits = CREDITS_MAX;
224 static int pipe_rcv_status(struct sock *sk, struct sk_buff *skb)
226 struct pep_sock *pn = pep_sk(sk);
227 struct pnpipehdr *hdr = pnp_hdr(skb);
230 if (!pskb_may_pull(skb, sizeof(*hdr) + 4))
233 if (hdr->data[0] != PN_PEP_TYPE_COMMON) {
234 LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP type: %u\n",
235 (unsigned)hdr->data[0]);
239 switch (hdr->data[1]) {
240 case PN_PEP_IND_FLOW_CONTROL:
242 case PN_LEGACY_FLOW_CONTROL:
243 switch (hdr->data[4]) {
245 atomic_set(&pn->tx_credits, 0);
248 atomic_set(&pn->tx_credits, wake = 1);
252 case PN_ONE_CREDIT_FLOW_CONTROL:
253 if (hdr->data[4] == PEP_IND_READY)
254 atomic_set(&pn->tx_credits, wake = 1);
259 case PN_PEP_IND_ID_MCFC_GRANT_CREDITS:
260 if (pn->tx_fc != PN_MULTI_CREDIT_FLOW_CONTROL)
262 atomic_add(wake = hdr->data[4], &pn->tx_credits);
266 LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP indication: %u\n",
267 (unsigned)hdr->data[1]);
271 sk->sk_write_space(sk);
275 static int pipe_rcv_created(struct sock *sk, struct sk_buff *skb)
277 struct pep_sock *pn = pep_sk(sk);
278 struct pnpipehdr *hdr = pnp_hdr(skb);
279 u8 n_sb = hdr->data[0];
281 pn->rx_fc = pn->tx_fc = PN_LEGACY_FLOW_CONTROL;
282 __skb_pull(skb, sizeof(*hdr));
284 u8 type, buf[2], len = sizeof(buf);
285 u8 *data = pep_get_sb(skb, &type, &len, buf);
290 case PN_PIPE_SB_NEGOTIATED_FC:
291 if (len < 2 || (data[0] | data[1]) > 3)
293 pn->tx_fc = data[0] & 3;
294 pn->rx_fc = data[1] & 3;
302 /* Queue an skb to a connected sock.
303 * Socket lock must be held. */
304 static int pipe_do_rcv(struct sock *sk, struct sk_buff *skb)
306 struct pep_sock *pn = pep_sk(sk);
307 struct pnpipehdr *hdr = pnp_hdr(skb);
308 struct sk_buff_head *queue;
311 BUG_ON(sk->sk_state == TCP_CLOSE_WAIT);
313 switch (hdr->message_id) {
314 case PNS_PEP_CONNECT_REQ:
315 pep_reject_conn(sk, skb, PN_PIPE_ERR_PEP_IN_USE);
318 case PNS_PEP_DISCONNECT_REQ:
319 pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
320 sk->sk_state = TCP_CLOSE_WAIT;
321 if (!sock_flag(sk, SOCK_DEAD))
322 sk->sk_state_change(sk);
325 case PNS_PEP_ENABLE_REQ:
326 /* Wait for PNS_PIPE_(ENABLED|REDIRECTED)_IND */
327 pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
330 case PNS_PEP_RESET_REQ:
331 switch (hdr->state_after_reset) {
332 case PN_PIPE_DISABLE:
338 default: /* not allowed to send an error here!? */
343 case PNS_PEP_DISABLE_REQ:
344 atomic_set(&pn->tx_credits, 0);
345 pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
348 case PNS_PEP_CTRL_REQ:
349 if (skb_queue_len(&pn->ctrlreq_queue) >= PNPIPE_CTRLREQ_MAX)
352 queue = &pn->ctrlreq_queue;
356 __skb_pull(skb, 3); /* Pipe data header */
357 if (!pn_flow_safe(pn->rx_fc)) {
358 err = sock_queue_rcv_skb(sk, skb);
364 if (pn->rx_credits == 0) {
369 queue = &sk->sk_receive_queue;
372 case PNS_PEP_STATUS_IND:
373 pipe_rcv_status(sk, skb);
376 case PNS_PIPE_REDIRECTED_IND:
377 err = pipe_rcv_created(sk, skb);
380 case PNS_PIPE_CREATED_IND:
381 err = pipe_rcv_created(sk, skb);
385 case PNS_PIPE_RESET_IND:
386 if (!pn->init_enable)
389 case PNS_PIPE_ENABLED_IND:
390 if (!pn_flow_safe(pn->tx_fc)) {
391 atomic_set(&pn->tx_credits, 1);
392 sk->sk_write_space(sk);
394 if (sk->sk_state == TCP_ESTABLISHED)
395 break; /* Nothing to do */
396 sk->sk_state = TCP_ESTABLISHED;
397 pipe_grant_credits(sk);
400 case PNS_PIPE_DISABLED_IND:
401 sk->sk_state = TCP_SYN_RECV;
406 LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP message: %u\n",
416 skb_set_owner_r(skb, sk);
418 skb_queue_tail(queue, skb);
419 if (!sock_flag(sk, SOCK_DEAD))
420 sk->sk_data_ready(sk, err);
424 /* Destroy connected sock. */
425 static void pipe_destruct(struct sock *sk)
427 struct pep_sock *pn = pep_sk(sk);
429 skb_queue_purge(&sk->sk_receive_queue);
430 skb_queue_purge(&pn->ctrlreq_queue);
433 static int pep_connreq_rcv(struct sock *sk, struct sk_buff *skb)
436 struct pep_sock *newpn, *pn = pep_sk(sk);
437 struct pnpipehdr *hdr;
438 struct sockaddr_pn dst;
440 u8 pipe_handle, enabled, n_sb;
442 if (!pskb_pull(skb, sizeof(*hdr) + 4))
446 pipe_handle = hdr->pipe_handle;
447 switch (hdr->state_after_connect) {
448 case PN_PIPE_DISABLE:
455 pep_reject_conn(sk, skb, PN_PIPE_ERR_INVALID_PARAM);
458 peer_type = hdr->other_pep_type << 8;
460 if (unlikely(sk->sk_state != TCP_LISTEN) || sk_acceptq_is_full(sk)) {
461 pep_reject_conn(sk, skb, PN_PIPE_ERR_PEP_IN_USE);
465 /* Parse sub-blocks (options) */
468 u8 type, buf[1], len = sizeof(buf);
469 const u8 *data = pep_get_sb(skb, &type, &len, buf);
474 case PN_PIPE_SB_CONNECT_REQ_PEP_SUB_TYPE:
477 peer_type = (peer_type & 0xff00) | data[0];
483 skb = skb_clone(skb, GFP_ATOMIC);
487 /* Create a new to-be-accepted sock */
488 newsk = sk_alloc(sock_net(sk), PF_PHONET, GFP_ATOMIC, sk->sk_prot);
493 sock_init_data(NULL, newsk);
494 newsk->sk_state = TCP_SYN_RECV;
495 newsk->sk_backlog_rcv = pipe_do_rcv;
496 newsk->sk_protocol = sk->sk_protocol;
497 newsk->sk_destruct = pipe_destruct;
499 newpn = pep_sk(newsk);
500 pn_skb_get_dst_sockaddr(skb, &dst);
501 newpn->pn_sk.sobject = pn_sockaddr_get_object(&dst);
502 newpn->pn_sk.resource = pn->pn_sk.resource;
503 skb_queue_head_init(&newpn->ctrlreq_queue);
504 newpn->pipe_handle = pipe_handle;
505 atomic_set(&newpn->tx_credits, 0);
506 newpn->peer_type = peer_type;
507 newpn->rx_credits = 0;
508 newpn->rx_fc = newpn->tx_fc = PN_LEGACY_FLOW_CONTROL;
509 newpn->init_enable = enabled;
511 BUG_ON(!skb_queue_empty(&newsk->sk_receive_queue));
512 skb_queue_head(&newsk->sk_receive_queue, skb);
513 if (!sock_flag(sk, SOCK_DEAD))
514 sk->sk_data_ready(sk, 0);
516 sk_acceptq_added(sk);
517 sk_add_node(newsk, &pn->ackq);
521 /* Listening sock must be locked */
522 static struct sock *pep_find_pipe(const struct hlist_head *hlist,
523 const struct sockaddr_pn *dst,
526 struct hlist_node *node;
528 u16 dobj = pn_sockaddr_get_object(dst);
530 sk_for_each(sknode, node, hlist) {
531 struct pep_sock *pnnode = pep_sk(sknode);
533 /* Ports match, but addresses might not: */
534 if (pnnode->pn_sk.sobject != dobj)
536 if (pnnode->pipe_handle != pipe_handle)
538 if (sknode->sk_state == TCP_CLOSE_WAIT)
548 * Deliver an skb to a listening sock.
549 * Socket lock must be held.
550 * We then queue the skb to the right connected sock (if any).
552 static int pep_do_rcv(struct sock *sk, struct sk_buff *skb)
554 struct pep_sock *pn = pep_sk(sk);
556 struct pnpipehdr *hdr;
557 struct sockaddr_pn dst;
558 int err = NET_RX_SUCCESS;
561 if (!pskb_may_pull(skb, sizeof(*hdr)))
565 pipe_handle = hdr->pipe_handle;
566 if (pipe_handle == PN_PIPE_INVALID_HANDLE)
569 pn_skb_get_dst_sockaddr(skb, &dst);
571 /* Look for an existing pipe handle */
572 sknode = pep_find_pipe(&pn->hlist, &dst, pipe_handle);
574 return sk_receive_skb(sknode, skb, 1);
576 /* Look for a pipe handle pending accept */
577 sknode = pep_find_pipe(&pn->ackq, &dst, pipe_handle);
581 printk(KERN_WARNING"Phonet unconnected PEP ignored");
586 switch (hdr->message_id) {
587 case PNS_PEP_CONNECT_REQ:
588 err = pep_connreq_rcv(sk, skb);
591 case PNS_PEP_DISCONNECT_REQ:
592 pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
595 case PNS_PEP_CTRL_REQ:
596 pep_ctrlreq_error(sk, skb, PN_PIPE_INVALID_HANDLE, GFP_ATOMIC);
599 case PNS_PEP_RESET_REQ:
600 case PNS_PEP_ENABLE_REQ:
601 case PNS_PEP_DISABLE_REQ:
602 /* invalid handle is not even allowed here! */
611 /* associated socket ceases to exist */
612 static void pep_sock_close(struct sock *sk, long timeout)
614 struct pep_sock *pn = pep_sk(sk);
617 sk_common_release(sk);
620 if (sk->sk_state == TCP_LISTEN) {
621 /* Destroy the listen queue */
623 struct hlist_node *p, *n;
625 sk_for_each_safe(sknode, p, n, &pn->ackq)
626 sk_del_node_init(sknode);
627 sk->sk_state = TCP_CLOSE;
629 ifindex = pn->ifindex;
637 static int pep_wait_connreq(struct sock *sk, int noblock)
639 struct task_struct *tsk = current;
640 struct pep_sock *pn = pep_sk(sk);
641 long timeo = sock_rcvtimeo(sk, noblock);
646 if (sk->sk_state != TCP_LISTEN)
648 if (!hlist_empty(&pn->ackq))
652 if (signal_pending(tsk))
653 return sock_intr_errno(timeo);
655 prepare_to_wait_exclusive(&sk->sk_socket->wait, &wait,
658 timeo = schedule_timeout(timeo);
660 finish_wait(&sk->sk_socket->wait, &wait);
666 static struct sock *pep_sock_accept(struct sock *sk, int flags, int *errp)
668 struct pep_sock *pn = pep_sk(sk);
669 struct sock *newsk = NULL;
670 struct sk_buff *oskb;
674 err = pep_wait_connreq(sk, flags & O_NONBLOCK);
678 newsk = __sk_head(&pn->ackq);
680 oskb = skb_dequeue(&newsk->sk_receive_queue);
681 err = pep_accept_conn(newsk, oskb);
683 skb_queue_head(&newsk->sk_receive_queue, oskb);
689 pep_sk(newsk)->listener = sk;
692 sk_del_node_init(newsk);
693 sk_acceptq_removed(sk);
694 sk_add_node(newsk, &pn->hlist);
703 static int pep_ioctl(struct sock *sk, int cmd, unsigned long arg)
705 struct pep_sock *pn = pep_sk(sk);
710 if (sk->sk_state == TCP_LISTEN)
714 if (sock_flag(sk, SOCK_URGINLINE)
715 && !skb_queue_empty(&pn->ctrlreq_queue))
716 answ = skb_peek(&pn->ctrlreq_queue)->len;
717 else if (!skb_queue_empty(&sk->sk_receive_queue))
718 answ = skb_peek(&sk->sk_receive_queue)->len;
722 return put_user(answ, (int __user *)arg);
728 static int pep_init(struct sock *sk)
730 struct pep_sock *pn = pep_sk(sk);
732 INIT_HLIST_HEAD(&pn->ackq);
733 INIT_HLIST_HEAD(&pn->hlist);
734 skb_queue_head_init(&pn->ctrlreq_queue);
735 pn->pipe_handle = PN_PIPE_INVALID_HANDLE;
739 static int pep_setsockopt(struct sock *sk, int level, int optname,
740 char __user *optval, int optlen)
742 struct pep_sock *pn = pep_sk(sk);
743 int val = 0, err = 0;
745 if (level != SOL_PNPIPE)
747 if (optlen >= sizeof(int)) {
748 if (get_user(val, (int __user *) optval))
755 if (val && val != PNPIPE_ENCAP_IP) {
759 if (!pn->ifindex == !val)
760 break; /* Nothing to do! */
761 if (!capable(CAP_NET_ADMIN)) {
767 err = gprs_attach(sk);
788 static int pep_getsockopt(struct sock *sk, int level, int optname,
789 char __user *optval, int __user *optlen)
791 struct pep_sock *pn = pep_sk(sk);
794 if (level != SOL_PNPIPE)
796 if (get_user(len, optlen))
801 val = pn->ifindex ? PNPIPE_ENCAP_IP : PNPIPE_ENCAP_NONE;
810 len = min_t(unsigned int, sizeof(int), len);
811 if (put_user(len, optlen))
813 if (put_user(val, (int __user *) optval))
818 static int pipe_skb_send(struct sock *sk, struct sk_buff *skb)
820 struct pep_sock *pn = pep_sk(sk);
821 struct pnpipehdr *ph;
823 if (pn_flow_safe(pn->tx_fc) &&
824 !atomic_add_unless(&pn->tx_credits, -1, 0)) {
830 skb_reset_transport_header(skb);
833 ph->message_id = PNS_PIPE_DATA;
834 ph->pipe_handle = pn->pipe_handle;
836 return pn_skb_send(sk, skb, &pipe_srv);
839 static int pep_sendmsg(struct kiocb *iocb, struct sock *sk,
840 struct msghdr *msg, size_t len)
842 struct pep_sock *pn = pep_sk(sk);
843 struct sk_buff *skb = NULL;
845 int flags = msg->msg_flags;
848 if (msg->msg_flags & MSG_OOB || !(msg->msg_flags & MSG_EOR))
852 timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
853 if ((1 << sk->sk_state) & (TCPF_LISTEN|TCPF_CLOSE)) {
857 if (sk->sk_state != TCP_ESTABLISHED) {
858 /* Wait until the pipe gets to enabled state */
860 err = sk_stream_wait_connect(sk, &timeo);
864 if (sk->sk_state == TCP_CLOSE_WAIT) {
869 BUG_ON(sk->sk_state != TCP_ESTABLISHED);
871 /* Wait until flow control allows TX */
872 done = atomic_read(&pn->tx_credits);
880 if (signal_pending(current)) {
881 err = sock_intr_errno(timeo);
885 prepare_to_wait(&sk->sk_socket->wait, &wait,
887 done = sk_wait_event(sk, &timeo, atomic_read(&pn->tx_credits));
888 finish_wait(&sk->sk_socket->wait, &wait);
890 if (sk->sk_state != TCP_ESTABLISHED)
895 skb = sock_alloc_send_skb(sk, MAX_PNPIPE_HEADER + len,
896 flags & MSG_DONTWAIT, &err);
899 skb_reserve(skb, MAX_PHONET_HEADER + 3);
901 if (sk->sk_state != TCP_ESTABLISHED ||
902 !atomic_read(&pn->tx_credits))
903 goto disabled; /* sock_alloc_send_skb might sleep */
906 err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
910 err = pipe_skb_send(sk, skb);
912 err = len; /* success! */
920 int pep_writeable(struct sock *sk)
922 struct pep_sock *pn = pep_sk(sk);
924 return atomic_read(&pn->tx_credits);
927 int pep_write(struct sock *sk, struct sk_buff *skb)
929 struct sk_buff *rskb, *fs;
932 rskb = alloc_skb(MAX_PNPIPE_HEADER, GFP_ATOMIC);
937 skb_shinfo(rskb)->frag_list = skb;
938 rskb->len += skb->len;
939 rskb->data_len += rskb->len;
940 rskb->truesize += rskb->len;
942 /* Avoid nested fragments */
943 for (fs = skb_shinfo(skb)->frag_list; fs; fs = fs->next)
945 skb->next = skb_shinfo(skb)->frag_list;
946 skb_shinfo(skb)->frag_list = NULL;
948 skb->data_len -= flen;
949 skb->truesize -= flen;
951 skb_reserve(rskb, MAX_PHONET_HEADER + 3);
952 return pipe_skb_send(sk, rskb);
955 struct sk_buff *pep_read(struct sock *sk)
957 struct sk_buff *skb = skb_dequeue(&sk->sk_receive_queue);
959 if (sk->sk_state == TCP_ESTABLISHED)
960 pipe_grant_credits(sk);
964 static int pep_recvmsg(struct kiocb *iocb, struct sock *sk,
965 struct msghdr *msg, size_t len, int noblock,
966 int flags, int *addr_len)
971 if (unlikely(1 << sk->sk_state & (TCPF_LISTEN | TCPF_CLOSE)))
974 if ((flags & MSG_OOB) || sock_flag(sk, SOCK_URGINLINE)) {
975 /* Dequeue and acknowledge control request */
976 struct pep_sock *pn = pep_sk(sk);
978 skb = skb_dequeue(&pn->ctrlreq_queue);
980 pep_ctrlreq_error(sk, skb, PN_PIPE_NO_ERROR,
982 msg->msg_flags |= MSG_OOB;
989 skb = skb_recv_datagram(sk, flags, noblock, &err);
992 if (err == -ENOTCONN && sk->sk_state == TCP_CLOSE_WAIT)
998 if (sk->sk_state == TCP_ESTABLISHED)
999 pipe_grant_credits(sk);
1002 msg->msg_flags |= MSG_EOR;
1004 msg->msg_flags |= MSG_TRUNC;
1008 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len);
1010 err = (flags & MSG_TRUNC) ? skb->len : len;
1012 skb_free_datagram(sk, skb);
1016 static void pep_sock_unhash(struct sock *sk)
1018 struct pep_sock *pn = pep_sk(sk);
1019 struct sock *skparent = NULL;
1022 if ((1 << sk->sk_state) & ~(TCPF_CLOSE|TCPF_LISTEN)) {
1023 skparent = pn->listener;
1024 sk_del_node_init(sk);
1028 pn = pep_sk(skparent);
1031 /* Unhash a listening sock only when it is closed
1032 * and all of its active connected pipes are closed. */
1033 if (hlist_empty(&pn->hlist))
1034 pn_sock_unhash(&pn->pn_sk.sk);
1041 static struct proto pep_proto = {
1042 .close = pep_sock_close,
1043 .accept = pep_sock_accept,
1046 .setsockopt = pep_setsockopt,
1047 .getsockopt = pep_getsockopt,
1048 .sendmsg = pep_sendmsg,
1049 .recvmsg = pep_recvmsg,
1050 .backlog_rcv = pep_do_rcv,
1051 .hash = pn_sock_hash,
1052 .unhash = pep_sock_unhash,
1053 .get_port = pn_sock_get_port,
1054 .obj_size = sizeof(struct pep_sock),
1055 .owner = THIS_MODULE,
1059 static struct phonet_protocol pep_pn_proto = {
1060 .ops = &phonet_stream_ops,
1062 .sock_type = SOCK_SEQPACKET,
1065 static int __init pep_register(void)
1067 return phonet_proto_register(PN_PROTO_PIPE, &pep_pn_proto);
1070 static void __exit pep_unregister(void)
1072 phonet_proto_unregister(PN_PROTO_PIPE, &pep_pn_proto);
1075 module_init(pep_register);
1076 module_exit(pep_unregister);
1077 MODULE_AUTHOR("Remi Denis-Courmont, Nokia");
1078 MODULE_DESCRIPTION("Phonet pipe protocol");
1079 MODULE_LICENSE("GPL");
1080 MODULE_ALIAS_NET_PF_PROTO(PF_PHONET, PN_PROTO_PIPE);