--- /dev/null
+/*
+ * File: pep.c
+ *
+ * Phonet pipe protocol end point socket
+ *
+ * Copyright (C) 2008 Nokia Corporation.
+ *
+ * Author: Rémi Denis-Courmont <remi.denis-courmont@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/socket.h>
+#include <net/sock.h>
+#include <net/tcp_states.h>
+#include <asm/ioctls.h>
+
+#include <linux/phonet.h>
+#include <net/phonet/phonet.h>
+#include <net/phonet/pep.h>
+
+/* sk_state values:
+ * TCP_CLOSE sock not in use yet
+ * TCP_CLOSE_WAIT disconnected pipe
+ * TCP_LISTEN listening pipe endpoint
+ * TCP_SYN_RECV connected pipe in disabled state
+ * TCP_ESTABLISHED connected pipe in enabled state
+ *
+ * pep_sock locking:
+ * - sk_state, ackq, hlist: sock lock needed
+ * - listener: read only
+ * - pipe_handle: read only
+ */
+
+#define CREDITS_MAX 10
+#define CREDITS_THR 7
+
+static const struct sockaddr_pn pipe_srv = {
+ .spn_family = AF_PHONET,
+ .spn_resource = 0xD9, /* pipe service */
+};
+
+#define pep_sb_size(s) (((s) + 5) & ~3) /* 2-bytes head, 32-bits aligned */
+
+/* Get the next TLV sub-block. */
+static unsigned char *pep_get_sb(struct sk_buff *skb, u8 *ptype, u8 *plen,
+ void *buf)
+{
+ void *data = NULL;
+ struct {
+ u8 sb_type;
+ u8 sb_len;
+ } *ph, h;
+ int buflen = *plen;
+
+ ph = skb_header_pointer(skb, 0, 2, &h);
+ if (ph == NULL || ph->sb_len < 2 || !pskb_may_pull(skb, ph->sb_len))
+ return NULL;
+ ph->sb_len -= 2;
+ *ptype = ph->sb_type;
+ *plen = ph->sb_len;
+
+ if (buflen > ph->sb_len)
+ buflen = ph->sb_len;
+ data = skb_header_pointer(skb, 2, buflen, buf);
+ __skb_pull(skb, 2 + ph->sb_len);
+ return data;
+}
+
+static int pep_reply(struct sock *sk, struct sk_buff *oskb,
+ u8 code, const void *data, int len, gfp_t priority)
+{
+ const struct pnpipehdr *oph = pnp_hdr(oskb);
+ struct pnpipehdr *ph;
+ struct sk_buff *skb;
+
+ skb = alloc_skb(MAX_PNPIPE_HEADER + len, priority);
+ if (!skb)
+ return -ENOMEM;
+ skb_set_owner_w(skb, sk);
+
+ skb_reserve(skb, MAX_PNPIPE_HEADER);
+ __skb_put(skb, len);
+ skb_copy_to_linear_data(skb, data, len);
+ __skb_push(skb, sizeof(*ph));
+ skb_reset_transport_header(skb);
+ ph = pnp_hdr(skb);
+ ph->utid = oph->utid;
+ ph->message_id = oph->message_id + 1; /* REQ -> RESP */
+ ph->pipe_handle = oph->pipe_handle;
+ ph->error_code = code;
+
+ return pn_skb_send(sk, skb, &pipe_srv);
+}
+
+#define PAD 0x00
+static int pep_accept_conn(struct sock *sk, struct sk_buff *skb)
+{
+ static const u8 data[20] = {
+ PAD, PAD, PAD, 2 /* sub-blocks */,
+ PN_PIPE_SB_REQUIRED_FC_TX, pep_sb_size(5), 3, PAD,
+ PN_MULTI_CREDIT_FLOW_CONTROL,
+ PN_ONE_CREDIT_FLOW_CONTROL,
+ PN_LEGACY_FLOW_CONTROL,
+ PAD,
+ PN_PIPE_SB_PREFERRED_FC_RX, pep_sb_size(5), 3, PAD,
+ PN_MULTI_CREDIT_FLOW_CONTROL,
+ PN_ONE_CREDIT_FLOW_CONTROL,
+ PN_LEGACY_FLOW_CONTROL,
+ PAD,
+ };
+
+ might_sleep();
+ return pep_reply(sk, skb, PN_PIPE_NO_ERROR, data, sizeof(data),
+ GFP_KERNEL);
+}
+
+static int pep_reject_conn(struct sock *sk, struct sk_buff *skb, u8 code)
+{
+ static const u8 data[4] = { PAD, PAD, PAD, 0 /* sub-blocks */ };
+ WARN_ON(code == PN_PIPE_NO_ERROR);
+ return pep_reply(sk, skb, code, data, sizeof(data), GFP_ATOMIC);
+}
+
+/* Control requests are not sent by the pipe service and have a specific
+ * message format. */
+static int pep_ctrlreq_error(struct sock *sk, struct sk_buff *oskb, u8 code)
+{
+ const struct pnpipehdr *oph = pnp_hdr(oskb);
+ struct sk_buff *skb;
+ struct pnpipehdr *ph;
+ struct sockaddr_pn dst;
+
+ skb = alloc_skb(MAX_PNPIPE_HEADER + 4, GFP_ATOMIC);
+ if (!skb)
+ return -ENOMEM;
+ skb_set_owner_w(skb, sk);
+
+ skb_reserve(skb, MAX_PHONET_HEADER);
+ ph = (struct pnpipehdr *)skb_put(skb, sizeof(*ph) + 4);
+
+ ph->utid = oph->utid;
+ ph->message_id = PNS_PEP_CTRL_RESP;
+ ph->pipe_handle = oph->pipe_handle;
+ ph->data[0] = oph->data[1]; /* CTRL id */
+ ph->data[1] = oph->data[0]; /* PEP type */
+ ph->data[2] = code; /* error code, at an usual offset */
+ ph->data[3] = PAD;
+ ph->data[4] = PAD;
+
+ pn_skb_get_src_sockaddr(oskb, &dst);
+ return pn_skb_send(sk, skb, &dst);
+}
+
+static int pipe_snd_status(struct sock *sk, u8 type, u8 status, gfp_t priority)
+{
+ struct pep_sock *pn = pep_sk(sk);
+ struct pnpipehdr *ph;
+ struct sk_buff *skb;
+
+ skb = alloc_skb(MAX_PNPIPE_HEADER + 4, priority);
+ if (!skb)
+ return -ENOMEM;
+ skb_set_owner_w(skb, sk);
+
+ skb_reserve(skb, MAX_PNPIPE_HEADER + 4);
+ __skb_push(skb, sizeof(*ph) + 4);
+ skb_reset_transport_header(skb);
+ ph = pnp_hdr(skb);
+ ph->utid = 0;
+ ph->message_id = PNS_PEP_STATUS_IND;
+ ph->pipe_handle = pn->pipe_handle;
+ ph->pep_type = PN_PEP_TYPE_COMMON;
+ ph->data[1] = type;
+ ph->data[2] = PAD;
+ ph->data[3] = PAD;
+ ph->data[4] = status;
+
+ return pn_skb_send(sk, skb, &pipe_srv);
+}
+
+/* Send our RX flow control information to the sender.
+ * Socket must be locked. */
+static void pipe_grant_credits(struct sock *sk)
+{
+ struct pep_sock *pn = pep_sk(sk);
+
+ BUG_ON(sk->sk_state != TCP_ESTABLISHED);
+
+ switch (pn->rx_fc) {
+ case PN_LEGACY_FLOW_CONTROL: /* TODO */
+ break;
+ case PN_ONE_CREDIT_FLOW_CONTROL:
+ pipe_snd_status(sk, PN_PEP_IND_FLOW_CONTROL,
+ PEP_IND_READY, GFP_ATOMIC);
+ pn->rx_credits = 1;
+ break;
+ case PN_MULTI_CREDIT_FLOW_CONTROL:
+ if ((pn->rx_credits + CREDITS_THR) > CREDITS_MAX)
+ break;
+ if (pipe_snd_status(sk, PN_PEP_IND_ID_MCFC_GRANT_CREDITS,
+ CREDITS_MAX - pn->rx_credits,
+ GFP_ATOMIC) == 0)
+ pn->rx_credits = CREDITS_MAX;
+ break;
+ }
+}
+
+static int pipe_rcv_status(struct sock *sk, struct sk_buff *skb)
+{
+ struct pep_sock *pn = pep_sk(sk);
+ struct pnpipehdr *hdr = pnp_hdr(skb);
+
+ if (!pskb_may_pull(skb, sizeof(*hdr) + 4))
+ return -EINVAL;
+
+ if (hdr->data[0] != PN_PEP_TYPE_COMMON) {
+ LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP type: %u\n",
+ (unsigned)hdr->data[0]);
+ return -EOPNOTSUPP;
+ }
+
+ switch (hdr->data[1]) {
+ case PN_PEP_IND_FLOW_CONTROL:
+ switch (pn->tx_fc) {
+ case PN_LEGACY_FLOW_CONTROL:
+ switch (hdr->data[4]) {
+ case PEP_IND_BUSY:
+ pn->tx_credits = 0;
+ break;
+ case PEP_IND_READY:
+ pn->tx_credits = 1;
+ break;
+ }
+ break;
+ case PN_ONE_CREDIT_FLOW_CONTROL:
+ if (hdr->data[4] == PEP_IND_READY)
+ pn->tx_credits = 1;
+ break;
+ }
+ break;
+
+ case PN_PEP_IND_ID_MCFC_GRANT_CREDITS:
+ if (pn->tx_fc != PN_MULTI_CREDIT_FLOW_CONTROL)
+ break;
+ if (pn->tx_credits + hdr->data[4] > 0xff)
+ pn->tx_credits = 0xff;
+ else
+ pn->tx_credits += hdr->data[4];
+ break;
+
+ default:
+ LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP indication: %u\n",
+ (unsigned)hdr->data[1]);
+ return -EOPNOTSUPP;
+ }
+ if (pn->tx_credits)
+ sk->sk_write_space(sk);
+ return 0;
+}
+
+static int pipe_rcv_created(struct sock *sk, struct sk_buff *skb)
+{
+ struct pep_sock *pn = pep_sk(sk);
+ struct pnpipehdr *hdr = pnp_hdr(skb);
+ u8 n_sb = hdr->data[0];
+
+ pn->rx_fc = pn->tx_fc = PN_LEGACY_FLOW_CONTROL;
+ __skb_pull(skb, sizeof(*hdr));
+ while (n_sb > 0) {
+ u8 type, buf[2], len = sizeof(buf);
+ u8 *data = pep_get_sb(skb, &type, &len, buf);
+
+ if (data == NULL)
+ return -EINVAL;
+ switch (type) {
+ case PN_PIPE_SB_NEGOTIATED_FC:
+ if (len < 2 || (data[0] | data[1]) > 3)
+ break;
+ pn->tx_fc = data[0] & 3;
+ pn->rx_fc = data[1] & 3;
+ break;
+ }
+ n_sb--;
+ }
+ return 0;
+}
+
+/* Queue an skb to a connected sock.
+ * Socket lock must be held. */
+static int pipe_do_rcv(struct sock *sk, struct sk_buff *skb)
+{
+ struct pep_sock *pn = pep_sk(sk);
+ struct pnpipehdr *hdr = pnp_hdr(skb);
+ int err = 0;
+
+ BUG_ON(sk->sk_state == TCP_CLOSE_WAIT);
+
+ switch (hdr->message_id) {
+ case PNS_PEP_CONNECT_REQ:
+ pep_reject_conn(sk, skb, PN_PIPE_ERR_PEP_IN_USE);
+ break;
+
+ case PNS_PEP_DISCONNECT_REQ:
+ pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
+ sk->sk_state = TCP_CLOSE_WAIT;
+ if (!sock_flag(sk, SOCK_DEAD))
+ sk->sk_state_change(sk);
+ break;
+
+ case PNS_PEP_ENABLE_REQ:
+ /* Wait for PNS_PIPE_(ENABLED|REDIRECTED)_IND */
+ pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
+ break;
+
+ case PNS_PEP_RESET_REQ:
+ switch (hdr->state_after_reset) {
+ case PN_PIPE_DISABLE:
+ pn->init_enable = 0;
+ break;
+ case PN_PIPE_ENABLE:
+ pn->init_enable = 1;
+ break;
+ default: /* not allowed to send an error here!? */
+ err = -EINVAL;
+ goto out;
+ }
+ /* fall through */
+ case PNS_PEP_DISABLE_REQ:
+ pn->tx_credits = 0;
+ pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
+ break;
+
+ case PNS_PEP_CTRL_REQ:
+ /* TODO */
+ pep_ctrlreq_error(sk, skb, PN_PIPE_NO_ERROR);
+ break;
+
+ case PNS_PIPE_DATA:
+ __skb_pull(skb, 3); /* Pipe data header */
+ if (!pn_flow_safe(pn->rx_fc)) {
+ err = sock_queue_rcv_skb(sk, skb);
+ if (!err)
+ return 0;
+ break;
+ }
+
+ if (pn->rx_credits == 0) {
+ err = -ENOBUFS;
+ break;
+ }
+ pn->rx_credits--;
+ skb->dev = NULL;
+ skb_set_owner_r(skb, sk);
+ err = skb->len;
+ skb_queue_tail(&sk->sk_receive_queue, skb);
+ if (!sock_flag(sk, SOCK_DEAD))
+ sk->sk_data_ready(sk, err);
+ return 0;
+
+ case PNS_PEP_STATUS_IND:
+ pipe_rcv_status(sk, skb);
+ break;
+
+ case PNS_PIPE_REDIRECTED_IND:
+ err = pipe_rcv_created(sk, skb);
+ break;
+
+ case PNS_PIPE_CREATED_IND:
+ err = pipe_rcv_created(sk, skb);
+ if (err)
+ break;
+ /* fall through */
+ case PNS_PIPE_RESET_IND:
+ if (!pn->init_enable)
+ break;
+ /* fall through */
+ case PNS_PIPE_ENABLED_IND:
+ if (!pn_flow_safe(pn->tx_fc)) {
+ pn->tx_credits = 1;
+ sk->sk_write_space(sk);
+ }
+ if (sk->sk_state == TCP_ESTABLISHED)
+ break; /* Nothing to do */
+ sk->sk_state = TCP_ESTABLISHED;
+ pipe_grant_credits(sk);
+ break;
+
+ case PNS_PIPE_DISABLED_IND:
+ sk->sk_state = TCP_SYN_RECV;
+ pn->rx_credits = 0;
+ break;
+
+ default:
+ LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP message: %u\n",
+ hdr->message_id);
+ err = -EINVAL;
+ }
+out:
+ kfree_skb(skb);
+ return err;
+}
+
+/* Destroy connected sock. */
+static void pipe_destruct(struct sock *sk)
+{
+ skb_queue_purge(&sk->sk_receive_queue);
+}
+
+static int pep_connreq_rcv(struct sock *sk, struct sk_buff *skb)
+{
+ struct sock *newsk;
+ struct pep_sock *newpn, *pn = pep_sk(sk);
+ struct pnpipehdr *hdr;
+ struct sockaddr_pn dst;
+ u16 peer_type;
+ u8 pipe_handle, enabled, n_sb;
+
+ if (!pskb_pull(skb, sizeof(*hdr) + 4))
+ return -EINVAL;
+
+ hdr = pnp_hdr(skb);
+ pipe_handle = hdr->pipe_handle;
+ switch (hdr->state_after_connect) {
+ case PN_PIPE_DISABLE:
+ enabled = 0;
+ break;
+ case PN_PIPE_ENABLE:
+ enabled = 1;
+ break;
+ default:
+ pep_reject_conn(sk, skb, PN_PIPE_ERR_INVALID_PARAM);
+ return -EINVAL;
+ }
+ peer_type = hdr->other_pep_type << 8;
+
+ if (unlikely(sk->sk_state != TCP_LISTEN) || sk_acceptq_is_full(sk)) {
+ pep_reject_conn(sk, skb, PN_PIPE_ERR_PEP_IN_USE);
+ return -ENOBUFS;
+ }
+
+ /* Parse sub-blocks (options) */
+ n_sb = hdr->data[4];
+ while (n_sb > 0) {
+ u8 type, buf[1], len = sizeof(buf);
+ const u8 *data = pep_get_sb(skb, &type, &len, buf);
+
+ if (data == NULL)
+ return -EINVAL;
+ switch (type) {
+ case PN_PIPE_SB_CONNECT_REQ_PEP_SUB_TYPE:
+ if (len < 1)
+ return -EINVAL;
+ peer_type = (peer_type & 0xff00) | data[0];
+ break;
+ }
+ n_sb--;
+ }
+
+ skb = skb_clone(skb, GFP_ATOMIC);
+ if (!skb)
+ return -ENOMEM;
+
+ /* Create a new to-be-accepted sock */
+ newsk = sk_alloc(sock_net(sk), PF_PHONET, GFP_ATOMIC, sk->sk_prot);
+ if (!newsk) {
+ kfree_skb(skb);
+ return -ENOMEM;
+ }
+ sock_init_data(NULL, newsk);
+ newsk->sk_state = TCP_SYN_RECV;
+ newsk->sk_backlog_rcv = pipe_do_rcv;
+ newsk->sk_protocol = sk->sk_protocol;
+ newsk->sk_destruct = pipe_destruct;
+
+ newpn = pep_sk(newsk);
+ pn_skb_get_dst_sockaddr(skb, &dst);
+ newpn->pn_sk.sobject = pn_sockaddr_get_object(&dst);
+ newpn->pn_sk.resource = pn->pn_sk.resource;
+ newpn->pipe_handle = pipe_handle;
+ newpn->peer_type = peer_type;
+ newpn->rx_credits = newpn->tx_credits = 0;
+ newpn->rx_fc = newpn->tx_fc = PN_LEGACY_FLOW_CONTROL;
+ newpn->init_enable = enabled;
+
+ BUG_ON(!skb_queue_empty(&newsk->sk_receive_queue));
+ skb_queue_head(&newsk->sk_receive_queue, skb);
+ if (!sock_flag(sk, SOCK_DEAD))
+ sk->sk_data_ready(sk, 0);
+
+ sk_acceptq_added(sk);
+ sk_add_node(newsk, &pn->ackq);
+ return 0;
+}
+
+/* Listening sock must be locked */
+static struct sock *pep_find_pipe(const struct hlist_head *hlist,
+ const struct sockaddr_pn *dst,
+ u8 pipe_handle)
+{
+ struct hlist_node *node;
+ struct sock *sknode;
+ u16 dobj = pn_sockaddr_get_object(dst);
+
+ sk_for_each(sknode, node, hlist) {
+ struct pep_sock *pnnode = pep_sk(sknode);
+
+ /* Ports match, but addresses might not: */
+ if (pnnode->pn_sk.sobject != dobj)
+ continue;
+ if (pnnode->pipe_handle != pipe_handle)
+ continue;
+ if (sknode->sk_state == TCP_CLOSE_WAIT)
+ continue;
+
+ sock_hold(sknode);
+ return sknode;
+ }
+ return NULL;
+}
+
+/*
+ * Deliver an skb to a listening sock.
+ * Socket lock must be held.
+ * We then queue the skb to the right connected sock (if any).
+ */
+static int pep_do_rcv(struct sock *sk, struct sk_buff *skb)
+{
+ struct pep_sock *pn = pep_sk(sk);
+ struct sock *sknode;
+ struct pnpipehdr *hdr = pnp_hdr(skb);
+ struct sockaddr_pn dst;
+ int err = NET_RX_SUCCESS;
+ u8 pipe_handle;
+
+ if (!pskb_may_pull(skb, sizeof(*hdr)))
+ goto drop;
+
+ hdr = pnp_hdr(skb);
+ pipe_handle = hdr->pipe_handle;
+ if (pipe_handle == PN_PIPE_INVALID_HANDLE)
+ goto drop;
+
+ pn_skb_get_dst_sockaddr(skb, &dst);
+
+ /* Look for an existing pipe handle */
+ sknode = pep_find_pipe(&pn->hlist, &dst, pipe_handle);
+ if (sknode)
+ return sk_receive_skb(sknode, skb, 1);
+
+ /* Look for a pipe handle pending accept */
+ sknode = pep_find_pipe(&pn->ackq, &dst, pipe_handle);
+ if (sknode) {
+ sock_put(sknode);
+ if (net_ratelimit())
+ printk(KERN_WARNING"Phonet unconnected PEP ignored");
+ err = NET_RX_DROP;
+ goto drop;
+ }
+
+ switch (hdr->message_id) {
+ case PNS_PEP_CONNECT_REQ:
+ err = pep_connreq_rcv(sk, skb);
+ break;
+
+ case PNS_PEP_DISCONNECT_REQ:
+ pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
+ break;
+
+ case PNS_PEP_CTRL_REQ:
+ pep_ctrlreq_error(sk, skb, PN_PIPE_INVALID_HANDLE);
+ break;
+
+ case PNS_PEP_RESET_REQ:
+ case PNS_PEP_ENABLE_REQ:
+ case PNS_PEP_DISABLE_REQ:
+ /* invalid handle is not even allowed here! */
+ default:
+ err = NET_RX_DROP;
+ }
+drop:
+ kfree_skb(skb);
+ return err;
+}
+
+/* associated socket ceases to exist */
+static void pep_sock_close(struct sock *sk, long timeout)
+{
+ struct pep_sock *pn = pep_sk(sk);
+
+ sk_common_release(sk);
+
+ lock_sock(sk);
+ if (sk->sk_state == TCP_LISTEN) {
+ /* Destroy the listen queue */
+ struct sock *sknode;
+ struct hlist_node *p, *n;
+
+ sk_for_each_safe(sknode, p, n, &pn->ackq)
+ sk_del_node_init(sknode);
+ sk->sk_state = TCP_CLOSE;
+ }
+ release_sock(sk);
+}
+
+static int pep_wait_connreq(struct sock *sk, int noblock)
+{
+ struct task_struct *tsk = current;
+ struct pep_sock *pn = pep_sk(sk);
+ long timeo = sock_rcvtimeo(sk, noblock);
+
+ for (;;) {
+ DEFINE_WAIT(wait);
+
+ if (sk->sk_state != TCP_LISTEN)
+ return -EINVAL;
+ if (!hlist_empty(&pn->ackq))
+ break;
+ if (!timeo)
+ return -EWOULDBLOCK;
+ if (signal_pending(tsk))
+ return sock_intr_errno(timeo);
+
+ prepare_to_wait_exclusive(&sk->sk_socket->wait, &wait,
+ TASK_INTERRUPTIBLE);
+ release_sock(sk);
+ timeo = schedule_timeout(timeo);
+ lock_sock(sk);
+ finish_wait(&sk->sk_socket->wait, &wait);
+ }
+
+ return 0;
+}
+
+static struct sock *pep_sock_accept(struct sock *sk, int flags, int *errp)
+{
+ struct pep_sock *pn = pep_sk(sk);
+ struct sock *newsk = NULL;
+ struct sk_buff *oskb;
+ int err;
+
+ lock_sock(sk);
+ err = pep_wait_connreq(sk, flags & O_NONBLOCK);
+ if (err)
+ goto out;
+
+ newsk = __sk_head(&pn->ackq);
+
+ oskb = skb_dequeue(&newsk->sk_receive_queue);
+ err = pep_accept_conn(newsk, oskb);
+ if (err) {
+ skb_queue_head(&newsk->sk_receive_queue, oskb);
+ newsk = NULL;
+ goto out;
+ }
+
+ sock_hold(sk);
+ pep_sk(newsk)->listener = sk;
+
+ sock_hold(newsk);
+ sk_del_node_init(newsk);
+ sk_acceptq_removed(sk);
+ sk_add_node(newsk, &pn->hlist);
+ __sock_put(newsk);
+
+out:
+ release_sock(sk);
+ *errp = err;
+ return newsk;
+}
+
+static int pep_ioctl(struct sock *sk, int cmd, unsigned long arg)
+{
+ int answ;
+
+ switch (cmd) {
+ case SIOCINQ:
+ if (sk->sk_state == TCP_LISTEN)
+ return -EINVAL;
+
+ lock_sock(sk);
+ if (!skb_queue_empty(&sk->sk_receive_queue))
+ answ = skb_peek(&sk->sk_receive_queue)->len;
+ else
+ answ = 0;
+ release_sock(sk);
+ return put_user(answ, (int __user *)arg);
+ }
+
+ return -ENOIOCTLCMD;
+}
+
+static int pep_init(struct sock *sk)
+{
+ struct pep_sock *pn = pep_sk(sk);
+
+ INIT_HLIST_HEAD(&pn->ackq);
+ INIT_HLIST_HEAD(&pn->hlist);
+ pn->pipe_handle = PN_PIPE_INVALID_HANDLE;
+ return 0;
+}
+
+static int pep_sendmsg(struct kiocb *iocb, struct sock *sk,
+ struct msghdr *msg, size_t len)
+{
+ struct pep_sock *pn = pep_sk(sk);
+ struct sk_buff *skb = NULL;
+ struct pnpipehdr *ph;
+ long timeo;
+ int flags = msg->msg_flags;
+ int err, done;
+
+ if (msg->msg_flags & MSG_OOB || !(msg->msg_flags & MSG_EOR))
+ return -EOPNOTSUPP;
+
+ lock_sock(sk);
+ timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
+ if ((1 << sk->sk_state) & (TCPF_LISTEN|TCPF_CLOSE)) {
+ err = -ENOTCONN;
+ goto out;
+ }
+ if (sk->sk_state != TCP_ESTABLISHED) {
+ /* Wait until the pipe gets to enabled state */
+disabled:
+ err = sk_stream_wait_connect(sk, &timeo);
+ if (err)
+ goto out;
+
+ if (sk->sk_state == TCP_CLOSE_WAIT) {
+ err = -ECONNRESET;
+ goto out;
+ }
+ }
+ BUG_ON(sk->sk_state != TCP_ESTABLISHED);
+
+ /* Wait until flow control allows TX */
+ done = pn->tx_credits > 0;
+ while (!done) {
+ DEFINE_WAIT(wait);
+
+ if (!timeo) {
+ err = -EAGAIN;
+ goto out;
+ }
+ if (signal_pending(current)) {
+ err = sock_intr_errno(timeo);
+ goto out;
+ }
+
+ prepare_to_wait(&sk->sk_socket->wait, &wait,
+ TASK_INTERRUPTIBLE);
+ done = sk_wait_event(sk, &timeo, pn->tx_credits > 0);
+ finish_wait(&sk->sk_socket->wait, &wait);
+
+ if (sk->sk_state != TCP_ESTABLISHED)
+ goto disabled;
+ }
+
+ if (!skb) {
+ skb = sock_alloc_send_skb(sk, MAX_PNPIPE_HEADER + len,
+ flags & MSG_DONTWAIT, &err);
+ if (skb == NULL)
+ goto out;
+ skb_reserve(skb, MAX_PHONET_HEADER + 3);
+
+ if (sk->sk_state != TCP_ESTABLISHED || !pn->tx_credits)
+ goto disabled; /* sock_alloc_send_skb might sleep */
+ }
+
+ err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
+ if (err < 0)
+ goto out;
+
+ __skb_push(skb, 3);
+ skb_reset_transport_header(skb);
+ ph = pnp_hdr(skb);
+ ph->utid = 0;
+ ph->message_id = PNS_PIPE_DATA;
+ ph->pipe_handle = pn->pipe_handle;
+ if (pn_flow_safe(pn->tx_fc)) /* credit-based flow control */
+ pn->tx_credits--;
+
+ err = pn_skb_send(sk, skb, &pipe_srv);
+ if (err >= 0)
+ err = len; /* success! */
+ skb = NULL;
+out:
+ release_sock(sk);
+ kfree_skb(skb);
+ return err;
+}
+
+static int pep_recvmsg(struct kiocb *iocb, struct sock *sk,
+ struct msghdr *msg, size_t len, int noblock,
+ int flags, int *addr_len)
+{
+ struct sk_buff *skb;
+ int err;
+
+ if (unlikely(flags & MSG_OOB))
+ return -EOPNOTSUPP;
+ if (unlikely(1 << sk->sk_state & (TCPF_LISTEN | TCPF_CLOSE)))
+ return -ENOTCONN;
+
+ skb = skb_recv_datagram(sk, flags, noblock, &err);
+ lock_sock(sk);
+ if (skb == NULL) {
+ if (err == -ENOTCONN && sk->sk_state == TCP_CLOSE_WAIT)
+ err = -ECONNRESET;
+ release_sock(sk);
+ return err;
+ }
+
+ if (sk->sk_state == TCP_ESTABLISHED)
+ pipe_grant_credits(sk);
+ release_sock(sk);
+
+ msg->msg_flags |= MSG_EOR;
+
+ if (skb->len > len)
+ msg->msg_flags |= MSG_TRUNC;
+ else
+ len = skb->len;
+
+ err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len);
+ if (!err)
+ err = (flags & MSG_TRUNC) ? skb->len : len;
+
+ skb_free_datagram(sk, skb);
+ return err;
+}
+
+static void pep_sock_unhash(struct sock *sk)
+{
+ struct pep_sock *pn = pep_sk(sk);
+ struct sock *skparent = NULL;
+
+ lock_sock(sk);
+ if ((1 << sk->sk_state) & ~(TCPF_CLOSE|TCPF_LISTEN)) {
+ skparent = pn->listener;
+ sk_del_node_init(sk);
+ release_sock(sk);
+
+ sk = skparent;
+ pn = pep_sk(skparent);
+ lock_sock(sk);
+ }
+ /* Unhash a listening sock only when it is closed
+ * and all of its active connected pipes are closed. */
+ if (hlist_empty(&pn->hlist))
+ pn_sock_unhash(&pn->pn_sk.sk);
+ release_sock(sk);
+
+ if (skparent)
+ sock_put(skparent);
+}
+
+static struct proto pep_proto = {
+ .close = pep_sock_close,
+ .accept = pep_sock_accept,
+ .ioctl = pep_ioctl,
+ .init = pep_init,
+ .sendmsg = pep_sendmsg,
+ .recvmsg = pep_recvmsg,
+ .backlog_rcv = pep_do_rcv,
+ .hash = pn_sock_hash,
+ .unhash = pep_sock_unhash,
+ .get_port = pn_sock_get_port,
+ .obj_size = sizeof(struct pep_sock),
+ .owner = THIS_MODULE,
+ .name = "PNPIPE",
+};
+
+static struct phonet_protocol pep_pn_proto = {
+ .ops = &phonet_stream_ops,
+ .prot = &pep_proto,
+ .sock_type = SOCK_SEQPACKET,
+};
+
+static int __init pep_register(void)
+{
+ return phonet_proto_register(PN_PROTO_PIPE, &pep_pn_proto);
+}
+
+static void __exit pep_unregister(void)
+{
+ phonet_proto_unregister(PN_PROTO_PIPE, &pep_pn_proto);
+}
+
+module_init(pep_register);
+module_exit(pep_unregister);
+MODULE_AUTHOR("Remi Denis-Courmont, Nokia");
+MODULE_DESCRIPTION("Phonet pipe protocol");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_NET_PF_PROTO(PF_PHONET, PN_PROTO_PIPE);
projects / openwrt / staging / blogic.git / commitdiff