1079 lines
24 KiB
C
1079 lines
24 KiB
C
/*
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* File: pep.c
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*
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* Phonet pipe protocol end point socket
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*
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* Copyright (C) 2008 Nokia Corporation.
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*
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* Author: RĂ©mi Denis-Courmont <remi.denis-courmont@nokia.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*/
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#include <linux/kernel.h>
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#include <linux/socket.h>
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#include <net/sock.h>
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#include <net/tcp_states.h>
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#include <asm/ioctls.h>
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#include <linux/phonet.h>
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#include <net/phonet/phonet.h>
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#include <net/phonet/pep.h>
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#include <net/phonet/gprs.h>
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/* sk_state values:
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* TCP_CLOSE sock not in use yet
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* TCP_CLOSE_WAIT disconnected pipe
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* TCP_LISTEN listening pipe endpoint
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* TCP_SYN_RECV connected pipe in disabled state
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* TCP_ESTABLISHED connected pipe in enabled state
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*
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* pep_sock locking:
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* - sk_state, ackq, hlist: sock lock needed
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* - listener: read only
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* - pipe_handle: read only
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*/
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#define CREDITS_MAX 10
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#define CREDITS_THR 7
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static const struct sockaddr_pn pipe_srv = {
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.spn_family = AF_PHONET,
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.spn_resource = 0xD9, /* pipe service */
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};
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#define pep_sb_size(s) (((s) + 5) & ~3) /* 2-bytes head, 32-bits aligned */
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/* Get the next TLV sub-block. */
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static unsigned char *pep_get_sb(struct sk_buff *skb, u8 *ptype, u8 *plen,
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void *buf)
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{
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void *data = NULL;
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struct {
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u8 sb_type;
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u8 sb_len;
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} *ph, h;
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int buflen = *plen;
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ph = skb_header_pointer(skb, 0, 2, &h);
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if (ph == NULL || ph->sb_len < 2 || !pskb_may_pull(skb, ph->sb_len))
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return NULL;
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ph->sb_len -= 2;
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*ptype = ph->sb_type;
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*plen = ph->sb_len;
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if (buflen > ph->sb_len)
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buflen = ph->sb_len;
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data = skb_header_pointer(skb, 2, buflen, buf);
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__skb_pull(skb, 2 + ph->sb_len);
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return data;
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}
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static int pep_reply(struct sock *sk, struct sk_buff *oskb,
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u8 code, const void *data, int len, gfp_t priority)
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{
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const struct pnpipehdr *oph = pnp_hdr(oskb);
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struct pnpipehdr *ph;
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struct sk_buff *skb;
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skb = alloc_skb(MAX_PNPIPE_HEADER + len, priority);
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if (!skb)
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return -ENOMEM;
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skb_set_owner_w(skb, sk);
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skb_reserve(skb, MAX_PNPIPE_HEADER);
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__skb_put(skb, len);
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skb_copy_to_linear_data(skb, data, len);
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__skb_push(skb, sizeof(*ph));
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skb_reset_transport_header(skb);
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ph = pnp_hdr(skb);
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ph->utid = oph->utid;
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ph->message_id = oph->message_id + 1; /* REQ -> RESP */
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ph->pipe_handle = oph->pipe_handle;
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ph->error_code = code;
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return pn_skb_send(sk, skb, &pipe_srv);
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}
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#define PAD 0x00
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static int pep_accept_conn(struct sock *sk, struct sk_buff *skb)
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{
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static const u8 data[20] = {
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PAD, PAD, PAD, 2 /* sub-blocks */,
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PN_PIPE_SB_REQUIRED_FC_TX, pep_sb_size(5), 3, PAD,
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PN_MULTI_CREDIT_FLOW_CONTROL,
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PN_ONE_CREDIT_FLOW_CONTROL,
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PN_LEGACY_FLOW_CONTROL,
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PAD,
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PN_PIPE_SB_PREFERRED_FC_RX, pep_sb_size(5), 3, PAD,
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PN_MULTI_CREDIT_FLOW_CONTROL,
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PN_ONE_CREDIT_FLOW_CONTROL,
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PN_LEGACY_FLOW_CONTROL,
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PAD,
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};
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might_sleep();
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return pep_reply(sk, skb, PN_PIPE_NO_ERROR, data, sizeof(data),
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GFP_KERNEL);
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}
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static int pep_reject_conn(struct sock *sk, struct sk_buff *skb, u8 code)
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{
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static const u8 data[4] = { PAD, PAD, PAD, 0 /* sub-blocks */ };
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WARN_ON(code == PN_PIPE_NO_ERROR);
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return pep_reply(sk, skb, code, data, sizeof(data), GFP_ATOMIC);
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}
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/* Control requests are not sent by the pipe service and have a specific
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* message format. */
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static int pep_ctrlreq_error(struct sock *sk, struct sk_buff *oskb, u8 code,
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gfp_t priority)
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{
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const struct pnpipehdr *oph = pnp_hdr(oskb);
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struct sk_buff *skb;
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struct pnpipehdr *ph;
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struct sockaddr_pn dst;
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skb = alloc_skb(MAX_PNPIPE_HEADER + 4, priority);
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if (!skb)
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return -ENOMEM;
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skb_set_owner_w(skb, sk);
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skb_reserve(skb, MAX_PHONET_HEADER);
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ph = (struct pnpipehdr *)skb_put(skb, sizeof(*ph) + 4);
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ph->utid = oph->utid;
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ph->message_id = PNS_PEP_CTRL_RESP;
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ph->pipe_handle = oph->pipe_handle;
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ph->data[0] = oph->data[1]; /* CTRL id */
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ph->data[1] = oph->data[0]; /* PEP type */
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ph->data[2] = code; /* error code, at an usual offset */
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ph->data[3] = PAD;
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ph->data[4] = PAD;
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pn_skb_get_src_sockaddr(oskb, &dst);
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return pn_skb_send(sk, skb, &dst);
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}
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static int pipe_snd_status(struct sock *sk, u8 type, u8 status, gfp_t priority)
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{
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struct pep_sock *pn = pep_sk(sk);
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struct pnpipehdr *ph;
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struct sk_buff *skb;
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skb = alloc_skb(MAX_PNPIPE_HEADER + 4, priority);
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if (!skb)
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return -ENOMEM;
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skb_set_owner_w(skb, sk);
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skb_reserve(skb, MAX_PNPIPE_HEADER + 4);
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__skb_push(skb, sizeof(*ph) + 4);
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skb_reset_transport_header(skb);
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ph = pnp_hdr(skb);
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ph->utid = 0;
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ph->message_id = PNS_PEP_STATUS_IND;
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ph->pipe_handle = pn->pipe_handle;
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ph->pep_type = PN_PEP_TYPE_COMMON;
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ph->data[1] = type;
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ph->data[2] = PAD;
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ph->data[3] = PAD;
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ph->data[4] = status;
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return pn_skb_send(sk, skb, &pipe_srv);
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}
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/* Send our RX flow control information to the sender.
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* Socket must be locked. */
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static void pipe_grant_credits(struct sock *sk)
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{
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struct pep_sock *pn = pep_sk(sk);
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BUG_ON(sk->sk_state != TCP_ESTABLISHED);
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switch (pn->rx_fc) {
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case PN_LEGACY_FLOW_CONTROL: /* TODO */
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break;
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case PN_ONE_CREDIT_FLOW_CONTROL:
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pipe_snd_status(sk, PN_PEP_IND_FLOW_CONTROL,
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PEP_IND_READY, GFP_ATOMIC);
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pn->rx_credits = 1;
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break;
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case PN_MULTI_CREDIT_FLOW_CONTROL:
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if ((pn->rx_credits + CREDITS_THR) > CREDITS_MAX)
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break;
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if (pipe_snd_status(sk, PN_PEP_IND_ID_MCFC_GRANT_CREDITS,
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CREDITS_MAX - pn->rx_credits,
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GFP_ATOMIC) == 0)
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pn->rx_credits = CREDITS_MAX;
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break;
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}
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}
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static int pipe_rcv_status(struct sock *sk, struct sk_buff *skb)
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{
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struct pep_sock *pn = pep_sk(sk);
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struct pnpipehdr *hdr = pnp_hdr(skb);
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int wake = 0;
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if (!pskb_may_pull(skb, sizeof(*hdr) + 4))
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return -EINVAL;
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if (hdr->data[0] != PN_PEP_TYPE_COMMON) {
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LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP type: %u\n",
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(unsigned)hdr->data[0]);
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return -EOPNOTSUPP;
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}
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switch (hdr->data[1]) {
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case PN_PEP_IND_FLOW_CONTROL:
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switch (pn->tx_fc) {
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case PN_LEGACY_FLOW_CONTROL:
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switch (hdr->data[4]) {
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case PEP_IND_BUSY:
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atomic_set(&pn->tx_credits, 0);
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break;
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case PEP_IND_READY:
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atomic_set(&pn->tx_credits, wake = 1);
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break;
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}
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break;
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case PN_ONE_CREDIT_FLOW_CONTROL:
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if (hdr->data[4] == PEP_IND_READY)
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atomic_set(&pn->tx_credits, wake = 1);
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break;
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}
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break;
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case PN_PEP_IND_ID_MCFC_GRANT_CREDITS:
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if (pn->tx_fc != PN_MULTI_CREDIT_FLOW_CONTROL)
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break;
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atomic_add(wake = hdr->data[4], &pn->tx_credits);
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break;
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default:
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LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP indication: %u\n",
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(unsigned)hdr->data[1]);
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return -EOPNOTSUPP;
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}
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if (wake)
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sk->sk_write_space(sk);
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return 0;
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}
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static int pipe_rcv_created(struct sock *sk, struct sk_buff *skb)
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{
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struct pep_sock *pn = pep_sk(sk);
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struct pnpipehdr *hdr = pnp_hdr(skb);
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u8 n_sb = hdr->data[0];
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pn->rx_fc = pn->tx_fc = PN_LEGACY_FLOW_CONTROL;
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__skb_pull(skb, sizeof(*hdr));
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while (n_sb > 0) {
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u8 type, buf[2], len = sizeof(buf);
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u8 *data = pep_get_sb(skb, &type, &len, buf);
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if (data == NULL)
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return -EINVAL;
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switch (type) {
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case PN_PIPE_SB_NEGOTIATED_FC:
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if (len < 2 || (data[0] | data[1]) > 3)
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break;
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pn->tx_fc = data[0] & 3;
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pn->rx_fc = data[1] & 3;
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break;
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}
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n_sb--;
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}
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return 0;
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}
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/* Queue an skb to a connected sock.
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* Socket lock must be held. */
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static int pipe_do_rcv(struct sock *sk, struct sk_buff *skb)
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{
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struct pep_sock *pn = pep_sk(sk);
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struct pnpipehdr *hdr = pnp_hdr(skb);
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struct sk_buff_head *queue;
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int err = 0;
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BUG_ON(sk->sk_state == TCP_CLOSE_WAIT);
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switch (hdr->message_id) {
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case PNS_PEP_CONNECT_REQ:
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pep_reject_conn(sk, skb, PN_PIPE_ERR_PEP_IN_USE);
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break;
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case PNS_PEP_DISCONNECT_REQ:
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pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
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sk->sk_state = TCP_CLOSE_WAIT;
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if (!sock_flag(sk, SOCK_DEAD))
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sk->sk_state_change(sk);
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break;
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case PNS_PEP_ENABLE_REQ:
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/* Wait for PNS_PIPE_(ENABLED|REDIRECTED)_IND */
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pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
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break;
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case PNS_PEP_RESET_REQ:
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switch (hdr->state_after_reset) {
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case PN_PIPE_DISABLE:
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pn->init_enable = 0;
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break;
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case PN_PIPE_ENABLE:
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pn->init_enable = 1;
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break;
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default: /* not allowed to send an error here!? */
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err = -EINVAL;
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goto out;
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}
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/* fall through */
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case PNS_PEP_DISABLE_REQ:
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atomic_set(&pn->tx_credits, 0);
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pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
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break;
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case PNS_PEP_CTRL_REQ:
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if (skb_queue_len(&pn->ctrlreq_queue) >= PNPIPE_CTRLREQ_MAX) {
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atomic_inc(&sk->sk_drops);
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break;
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}
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__skb_pull(skb, 4);
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queue = &pn->ctrlreq_queue;
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goto queue;
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case PNS_PIPE_DATA:
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__skb_pull(skb, 3); /* Pipe data header */
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if (!pn_flow_safe(pn->rx_fc)) {
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err = sock_queue_rcv_skb(sk, skb);
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if (!err)
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return 0;
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break;
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}
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if (pn->rx_credits == 0) {
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atomic_inc(&sk->sk_drops);
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err = -ENOBUFS;
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break;
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}
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pn->rx_credits--;
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queue = &sk->sk_receive_queue;
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goto queue;
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case PNS_PEP_STATUS_IND:
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pipe_rcv_status(sk, skb);
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break;
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case PNS_PIPE_REDIRECTED_IND:
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err = pipe_rcv_created(sk, skb);
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break;
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case PNS_PIPE_CREATED_IND:
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err = pipe_rcv_created(sk, skb);
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if (err)
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break;
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/* fall through */
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case PNS_PIPE_RESET_IND:
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if (!pn->init_enable)
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break;
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/* fall through */
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case PNS_PIPE_ENABLED_IND:
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if (!pn_flow_safe(pn->tx_fc)) {
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atomic_set(&pn->tx_credits, 1);
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sk->sk_write_space(sk);
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}
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if (sk->sk_state == TCP_ESTABLISHED)
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break; /* Nothing to do */
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sk->sk_state = TCP_ESTABLISHED;
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pipe_grant_credits(sk);
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break;
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|
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case PNS_PIPE_DISABLED_IND:
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sk->sk_state = TCP_SYN_RECV;
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pn->rx_credits = 0;
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break;
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default:
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LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP message: %u\n",
|
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hdr->message_id);
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err = -EINVAL;
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}
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out:
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kfree_skb(skb);
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return err;
|
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queue:
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skb->dev = NULL;
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skb_set_owner_r(skb, sk);
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err = skb->len;
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skb_queue_tail(queue, skb);
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if (!sock_flag(sk, SOCK_DEAD))
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sk->sk_data_ready(sk, err);
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return 0;
|
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}
|
|
|
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/* Destroy connected sock. */
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static void pipe_destruct(struct sock *sk)
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{
|
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struct pep_sock *pn = pep_sk(sk);
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|
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skb_queue_purge(&sk->sk_receive_queue);
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skb_queue_purge(&pn->ctrlreq_queue);
|
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}
|
|
|
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static int pep_connreq_rcv(struct sock *sk, struct sk_buff *skb)
|
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{
|
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struct sock *newsk;
|
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struct pep_sock *newpn, *pn = pep_sk(sk);
|
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struct pnpipehdr *hdr;
|
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struct sockaddr_pn dst;
|
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u16 peer_type;
|
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u8 pipe_handle, enabled, n_sb;
|
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|
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if (!pskb_pull(skb, sizeof(*hdr) + 4))
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return -EINVAL;
|
|
|
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hdr = pnp_hdr(skb);
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pipe_handle = hdr->pipe_handle;
|
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switch (hdr->state_after_connect) {
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case PN_PIPE_DISABLE:
|
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enabled = 0;
|
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break;
|
|
case PN_PIPE_ENABLE:
|
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enabled = 1;
|
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break;
|
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default:
|
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pep_reject_conn(sk, skb, PN_PIPE_ERR_INVALID_PARAM);
|
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return -EINVAL;
|
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}
|
|
peer_type = hdr->other_pep_type << 8;
|
|
|
|
if (unlikely(sk->sk_state != TCP_LISTEN) || sk_acceptq_is_full(sk)) {
|
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pep_reject_conn(sk, skb, PN_PIPE_ERR_PEP_IN_USE);
|
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return -ENOBUFS;
|
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}
|
|
|
|
/* 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);
|
|
|
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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;
|
|
skb_queue_head_init(&newpn->ctrlreq_queue);
|
|
newpn->pipe_handle = pipe_handle;
|
|
atomic_set(&newpn->tx_credits, 0);
|
|
newpn->peer_type = peer_type;
|
|
newpn->rx_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;
|
|
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, GFP_ATOMIC);
|
|
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);
|
|
int ifindex = 0;
|
|
|
|
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;
|
|
}
|
|
ifindex = pn->ifindex;
|
|
pn->ifindex = 0;
|
|
release_sock(sk);
|
|
|
|
if (ifindex)
|
|
gprs_detach(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)
|
|
{
|
|
struct pep_sock *pn = pep_sk(sk);
|
|
int answ;
|
|
|
|
switch (cmd) {
|
|
case SIOCINQ:
|
|
if (sk->sk_state == TCP_LISTEN)
|
|
return -EINVAL;
|
|
|
|
lock_sock(sk);
|
|
if (sock_flag(sk, SOCK_URGINLINE)
|
|
&& !skb_queue_empty(&pn->ctrlreq_queue))
|
|
answ = skb_peek(&pn->ctrlreq_queue)->len;
|
|
else 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);
|
|
skb_queue_head_init(&pn->ctrlreq_queue);
|
|
pn->pipe_handle = PN_PIPE_INVALID_HANDLE;
|
|
return 0;
|
|
}
|
|
|
|
static int pep_setsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, unsigned int optlen)
|
|
{
|
|
struct pep_sock *pn = pep_sk(sk);
|
|
int val = 0, err = 0;
|
|
|
|
if (level != SOL_PNPIPE)
|
|
return -ENOPROTOOPT;
|
|
if (optlen >= sizeof(int)) {
|
|
if (get_user(val, (int __user *) optval))
|
|
return -EFAULT;
|
|
}
|
|
|
|
lock_sock(sk);
|
|
switch (optname) {
|
|
case PNPIPE_ENCAP:
|
|
if (val && val != PNPIPE_ENCAP_IP) {
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
if (!pn->ifindex == !val)
|
|
break; /* Nothing to do! */
|
|
if (!capable(CAP_NET_ADMIN)) {
|
|
err = -EPERM;
|
|
break;
|
|
}
|
|
if (val) {
|
|
release_sock(sk);
|
|
err = gprs_attach(sk);
|
|
if (err > 0) {
|
|
pn->ifindex = err;
|
|
err = 0;
|
|
}
|
|
} else {
|
|
pn->ifindex = 0;
|
|
release_sock(sk);
|
|
gprs_detach(sk);
|
|
err = 0;
|
|
}
|
|
goto out_norel;
|
|
default:
|
|
err = -ENOPROTOOPT;
|
|
}
|
|
release_sock(sk);
|
|
|
|
out_norel:
|
|
return err;
|
|
}
|
|
|
|
static int pep_getsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, int __user *optlen)
|
|
{
|
|
struct pep_sock *pn = pep_sk(sk);
|
|
int len, val;
|
|
|
|
if (level != SOL_PNPIPE)
|
|
return -ENOPROTOOPT;
|
|
if (get_user(len, optlen))
|
|
return -EFAULT;
|
|
|
|
switch (optname) {
|
|
case PNPIPE_ENCAP:
|
|
val = pn->ifindex ? PNPIPE_ENCAP_IP : PNPIPE_ENCAP_NONE;
|
|
break;
|
|
case PNPIPE_IFINDEX:
|
|
val = pn->ifindex;
|
|
break;
|
|
default:
|
|
return -ENOPROTOOPT;
|
|
}
|
|
|
|
len = min_t(unsigned int, sizeof(int), len);
|
|
if (put_user(len, optlen))
|
|
return -EFAULT;
|
|
if (put_user(val, (int __user *) optval))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
|
|
static int pipe_skb_send(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
struct pep_sock *pn = pep_sk(sk);
|
|
struct pnpipehdr *ph;
|
|
|
|
if (pn_flow_safe(pn->tx_fc) &&
|
|
!atomic_add_unless(&pn->tx_credits, -1, 0)) {
|
|
kfree_skb(skb);
|
|
return -ENOBUFS;
|
|
}
|
|
|
|
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;
|
|
|
|
return pn_skb_send(sk, skb, &pipe_srv);
|
|
}
|
|
|
|
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;
|
|
long timeo;
|
|
int flags = msg->msg_flags;
|
|
int err, done;
|
|
|
|
if (msg->msg_flags & MSG_OOB || !(msg->msg_flags & MSG_EOR))
|
|
return -EOPNOTSUPP;
|
|
|
|
skb = sock_alloc_send_skb(sk, MAX_PNPIPE_HEADER + len,
|
|
flags & MSG_DONTWAIT, &err);
|
|
if (!skb)
|
|
return -ENOBUFS;
|
|
|
|
skb_reserve(skb, MAX_PHONET_HEADER + 3);
|
|
err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
|
|
if (err < 0)
|
|
goto outfree;
|
|
|
|
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 = atomic_read(&pn->tx_credits);
|
|
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, atomic_read(&pn->tx_credits));
|
|
finish_wait(&sk->sk_socket->wait, &wait);
|
|
|
|
if (sk->sk_state != TCP_ESTABLISHED)
|
|
goto disabled;
|
|
}
|
|
|
|
err = pipe_skb_send(sk, skb);
|
|
if (err >= 0)
|
|
err = len; /* success! */
|
|
skb = NULL;
|
|
out:
|
|
release_sock(sk);
|
|
outfree:
|
|
kfree_skb(skb);
|
|
return err;
|
|
}
|
|
|
|
int pep_writeable(struct sock *sk)
|
|
{
|
|
struct pep_sock *pn = pep_sk(sk);
|
|
|
|
return atomic_read(&pn->tx_credits);
|
|
}
|
|
|
|
int pep_write(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
struct sk_buff *rskb, *fs;
|
|
int flen = 0;
|
|
|
|
rskb = alloc_skb(MAX_PNPIPE_HEADER, GFP_ATOMIC);
|
|
if (!rskb) {
|
|
kfree_skb(skb);
|
|
return -ENOMEM;
|
|
}
|
|
skb_shinfo(rskb)->frag_list = skb;
|
|
rskb->len += skb->len;
|
|
rskb->data_len += rskb->len;
|
|
rskb->truesize += rskb->len;
|
|
|
|
/* Avoid nested fragments */
|
|
skb_walk_frags(skb, fs)
|
|
flen += fs->len;
|
|
skb->next = skb_shinfo(skb)->frag_list;
|
|
skb_frag_list_init(skb);
|
|
skb->len -= flen;
|
|
skb->data_len -= flen;
|
|
skb->truesize -= flen;
|
|
|
|
skb_reserve(rskb, MAX_PHONET_HEADER + 3);
|
|
return pipe_skb_send(sk, rskb);
|
|
}
|
|
|
|
struct sk_buff *pep_read(struct sock *sk)
|
|
{
|
|
struct sk_buff *skb = skb_dequeue(&sk->sk_receive_queue);
|
|
|
|
if (sk->sk_state == TCP_ESTABLISHED)
|
|
pipe_grant_credits(sk);
|
|
return skb;
|
|
}
|
|
|
|
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(1 << sk->sk_state & (TCPF_LISTEN | TCPF_CLOSE)))
|
|
return -ENOTCONN;
|
|
|
|
if ((flags & MSG_OOB) || sock_flag(sk, SOCK_URGINLINE)) {
|
|
/* Dequeue and acknowledge control request */
|
|
struct pep_sock *pn = pep_sk(sk);
|
|
|
|
skb = skb_dequeue(&pn->ctrlreq_queue);
|
|
if (skb) {
|
|
pep_ctrlreq_error(sk, skb, PN_PIPE_NO_ERROR,
|
|
GFP_KERNEL);
|
|
msg->msg_flags |= MSG_OOB;
|
|
goto copy;
|
|
}
|
|
if (flags & MSG_OOB)
|
|
return -EINVAL;
|
|
}
|
|
|
|
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);
|
|
copy:
|
|
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,
|
|
.setsockopt = pep_setsockopt,
|
|
.getsockopt = pep_getsockopt,
|
|
.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);
|