Release 4.11 net/phonet/pep.c

/*
 * File: pep.c
 *
 * Phonet pipe protocol end point socket
 *
 * Copyright (C) 2008 Nokia Corporation.
 *
 * Author: Rémi Denis-Courmont
 *
 * 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/sched/signal.h>
#include <linux/slab.h>
#include <linux/socket.h>
#include <net/sock.h>
#include <net/tcp_states.h>
#include <asm/ioctls.h>

#include <linux/phonet.h>
#include <linux/module.h>
#include <net/phonet/phonet.h>
#include <net/phonet/pep.h>
#include <net/phonet/gprs.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, hlist: sock lock needed
 *  - listener: read only
 *  - pipe_handle: read only
 */


#define CREDITS_MAX	10

#define CREDITS_THR	7


#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;
}

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static struct sk_buff *pep_alloc_skb(struct sock *sk, const void *payload,
					int len, gfp_t priority)
{
	struct sk_buff *skb = alloc_skb(MAX_PNPIPE_HEADER + len, priority);
	if (!skb)
		return NULL;
	skb_set_owner_w(skb, sk);

	skb_reserve(skb, MAX_PNPIPE_HEADER);
	__skb_put(skb, len);
	skb_copy_to_linear_data(skb, payload, len);
	__skb_push(skb, sizeof(struct pnpipehdr));
	skb_reset_transport_header(skb);
	return skb;
}

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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;
	struct sockaddr_pn peer;

	skb = pep_alloc_skb(sk, data, len, priority);
	if (!skb)
		return -ENOMEM;

	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;

	pn_skb_get_src_sockaddr(oskb, &peer);
	return pn_skb_send(sk, skb, &peer);
}

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static int pep_indicate(struct sock *sk, u8 id, u8 code,
			const void *data, int len, gfp_t priority)
{
	struct pep_sock *pn = pep_sk(sk);
	struct pnpipehdr *ph;
	struct sk_buff *skb;

	skb = pep_alloc_skb(sk, data, len, priority);
	if (!skb)
		return -ENOMEM;

	ph = pnp_hdr(skb);
	ph->utid = 0;
	ph->message_id = id;
	ph->pipe_handle = pn->pipe_handle;
	ph->data[0] = code;
	return pn_skb_send(sk, skb, NULL);
}

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#define PAD 0x00



static int pipe_handler_request(struct sock *sk, u8 id, u8 code,
				const void *data, int len)
{
	struct pep_sock *pn = pep_sk(sk);
	struct pnpipehdr *ph;
	struct sk_buff *skb;

	skb = pep_alloc_skb(sk, data, len, GFP_KERNEL);
	if (!skb)
		return -ENOMEM;

	ph = pnp_hdr(skb);
	ph->utid = id; /* whatever */
	ph->message_id = id;
	ph->pipe_handle = pn->pipe_handle;
	ph->data[0] = code;
	return pn_skb_send(sk, skb, NULL);
}

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static int pipe_handler_send_created_ind(struct sock *sk)
{
	struct pep_sock *pn = pep_sk(sk);
	u8 data[4] = {
		PN_PIPE_SB_NEGOTIATED_FC, pep_sb_size(2),
		pn->tx_fc, pn->rx_fc,
        };

	return pep_indicate(sk, PNS_PIPE_CREATED_IND, 1 /* sub-blocks */,
				data, 4, GFP_ATOMIC);
}

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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);
}

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static int pep_reject_conn(struct sock *sk, struct sk_buff *skb, u8 code,
				gfp_t priority)
{
	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), priority);
}

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/* 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,
				gfp_t priority)
{
	const struct pnpipehdr *oph = pnp_hdr(oskb);
	struct sk_buff *skb;
	struct pnpipehdr *ph;
	struct sockaddr_pn dst;
	u8 data[4] = {
		oph->data[0], /* PEP type */
		code, /* error code, at an unusual offset */
		PAD, PAD,
        };

	skb = pep_alloc_skb(sk, data, 4, priority);
	if (!skb)
		return -ENOMEM;

	ph = pnp_hdr(skb);
	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 */

	pn_skb_get_src_sockaddr(oskb, &dst);
	return pn_skb_send(sk, skb, &dst);
}

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static int pipe_snd_status(struct sock *sk, u8 type, u8 status, gfp_t priority)
{
	u8 data[4] = { type, PAD, PAD, status };

	return pep_indicate(sk, PNS_PEP_STATUS_IND, PN_PEP_TYPE_COMMON,
				data, 4, priority);
}

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/* Send our RX flow control information to the sender.
 * Socket must be locked. */


static void pipe_grant_credits(struct sock *sk, gfp_t priority)
{
	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:
		if (pipe_snd_status(sk, PN_PEP_IND_FLOW_CONTROL,
					PEP_IND_READY, priority) == 0)
			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,
					priority) == 0)
			pn->rx_credits = CREDITS_MAX;
		break;
	}
}

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static int pipe_rcv_status(struct sock *sk, struct sk_buff *skb)
{
	struct pep_sock *pn = pep_sk(sk);
	struct pnpipehdr *hdr;
	int wake = 0;

	if (!pskb_may_pull(skb, sizeof(*hdr) + 4))
		return -EINVAL;

	hdr = pnp_hdr(skb);
	if (hdr->data[0] != PN_PEP_TYPE_COMMON) {
		net_dbg_ratelimited("Phonet unknown PEP type: %u\n",
				    (unsigned int)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:
				atomic_set(&pn->tx_credits, 0);
				break;
			case PEP_IND_READY:
				atomic_set(&pn->tx_credits, wake = 1);
				break;
			}
			break;
		case PN_ONE_CREDIT_FLOW_CONTROL:
			if (hdr->data[4] == PEP_IND_READY)
				atomic_set(&pn->tx_credits, wake = 1);
			break;
		}
		break;

	case PN_PEP_IND_ID_MCFC_GRANT_CREDITS:
		if (pn->tx_fc != PN_MULTI_CREDIT_FLOW_CONTROL)
			break;
		atomic_add(wake = hdr->data[4], &pn->tx_credits);
		break;

	default:
		net_dbg_ratelimited("Phonet unknown PEP indication: %u\n",
				    (unsigned int)hdr->data[1]);
		return -EOPNOTSUPP;
	}
	if (wake)
		sk->sk_write_space(sk);
	return 0;
}

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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;
}

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/* 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);
	struct sk_buff_head *queue;
	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, GFP_ATOMIC);
		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:
		atomic_set(&pn->tx_credits, 0);
		pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
		break;

	case PNS_PEP_CTRL_REQ:
		if (skb_queue_len(&pn->ctrlreq_queue) >= PNPIPE_CTRLREQ_MAX) {
			atomic_inc(&sk->sk_drops);
			break;
		}
		__skb_pull(skb, 4);
		queue = &pn->ctrlreq_queue;
		goto queue;

	case PNS_PIPE_ALIGNED_DATA:
		__skb_pull(skb, 1);
		/* fall through */
	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 NET_RX_SUCCESS;
			err = -ENOBUFS;
			break;
		}

		if (pn->rx_credits == 0) {
			atomic_inc(&sk->sk_drops);
			err = -ENOBUFS;
			break;
		}
		pn->rx_credits--;
		queue = &sk->sk_receive_queue;
		goto queue;

	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)) {
			atomic_set(&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, GFP_ATOMIC);
		break;

	case PNS_PIPE_DISABLED_IND:
		sk->sk_state = TCP_SYN_RECV;
		pn->rx_credits = 0;
		break;

	default:
		net_dbg_ratelimited("Phonet unknown PEP message: %u\n",
				    hdr->message_id);
		err = -EINVAL;
	}
out:
	kfree_skb(skb);
	return (err == -ENOBUFS) ? NET_RX_DROP : NET_RX_SUCCESS;

queue:
	skb->dev = NULL;
	skb_set_owner_r(skb, sk);
	skb_queue_tail(queue, skb);
	if (!sock_flag(sk, SOCK_DEAD))
		sk->sk_data_ready(sk);
	return NET_RX_SUCCESS;
}

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19.20%
2
18.18%
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1
0.18%
1
9.09%
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552
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11
100.00%

/* Destroy connected sock. */


static void pipe_destruct(struct sock *sk)
{
	struct pep_sock *pn = pep_sk(sk);

	skb_queue_purge(&sk->sk_receive_queue);
	skb_queue_purge(&pn->ctrlreq_queue);
}

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static u8 pipe_negotiate_fc(const u8 *fcs, unsigned int n)
{
	unsigned int i;
	u8 final_fc = PN_NO_FLOW_CONTROL;

	for (i = 0; i < n; i++) {
		u8 fc = fcs[i];

		if (fc > final_fc && fc < PN_MAX_FLOW_CONTROL)
			final_fc = fc;
	}
	return final_fc;
}

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static int pep_connresp_rcv(struct sock *sk, struct sk_buff *skb)
{
	struct pep_sock *pn = pep_sk(sk);
	struct pnpipehdr *hdr;
	u8 n_sb;

	if (!pskb_pull(skb, sizeof(*hdr) + 4))
		return -EINVAL;

	hdr = pnp_hdr(skb);
	if (hdr->error_code != PN_PIPE_NO_ERROR)
		return -ECONNREFUSED;

	/* Parse sub-blocks */
	n_sb = hdr->data[4];
	while (n_sb > 0) {
		u8 type, buf[6], len = sizeof(buf);
		const u8 *data = pep_get_sb(skb, &type, &len, buf);

		if (data == NULL)
			return -EINVAL;

		switch (type) {
		case PN_PIPE_SB_REQUIRED_FC_TX:
			if (len < 2 || len < data[0])
				break;
			pn->tx_fc = pipe_negotiate_fc(data + 2, len - 2);
			break;

		case PN_PIPE_SB_PREFERRED_FC_RX:
			if (len < 2 || len < data[0])
				break;
			pn->rx_fc = pipe_negotiate_fc(data + 2, len - 2);
			break;

		}
		n_sb--;
	}

	return pipe_handler_send_created_ind(sk);
}

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static int pep_enableresp_rcv(struct sock *sk, struct sk_buff *skb)
{
	struct pnpipehdr *hdr = pnp_hdr(skb);

	if (hdr->error_code != PN_PIPE_NO_ERROR)
		return -ECONNREFUSED;

	return pep_indicate(sk, PNS_PIPE_ENABLED_IND, 0 /* sub-blocks */,
		NULL, 0, GFP_ATOMIC);

}

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static void pipe_start_flow_control(struct sock *sk)
{
	struct pep_sock *pn = pep_sk(sk);

	if (!pn_flow_safe(pn->tx_fc)) {
		atomic_set(&pn->tx_credits, 1);
		sk->sk_write_space(sk);
	}
	pipe_grant_credits(sk, GFP_ATOMIC);
}

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/* Queue an skb to an actively connected sock.
 * Socket lock must be held. */


static int pipe_handler_do_rcv(struct sock *sk, struct sk_buff *skb)
{
	struct pep_sock *pn = pep_sk(sk);
	struct pnpipehdr *hdr = pnp_hdr(skb);
	int err = NET_RX_SUCCESS;

	switch (hdr->message_id) {
	case PNS_PIPE_ALIGNED_DATA:
		__skb_pull(skb, 1);
		/* fall through */
	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 NET_RX_SUCCESS;
			err = NET_RX_DROP;
			break;
		}

		if (pn->rx_credits == 0) {
			atomic_inc(&sk->sk_drops);
			err = NET_RX_DROP;
			break;
		}
		pn->rx_credits--;
		skb->dev = NULL;
		skb_set_owner_r(skb, sk);
		skb_queue_tail(&sk->sk_receive_queue, skb);
		if (!sock_flag(sk, SOCK_DEAD))
			sk->sk_data_ready(sk);
		return NET_RX_SUCCESS;

	case PNS_PEP_CONNECT_RESP:
		if (sk->sk_state != TCP_SYN_SENT)
			break;
		if (!sock_flag(sk, SOCK_DEAD))
			sk->sk_state_change(sk);
		if (pep_connresp_rcv(sk, skb)) {
			sk->sk_state = TCP_CLOSE_WAIT;
			break;
		}
		if (pn->init_enable == PN_PIPE_DISABLE)
			sk->sk_state = TCP_SYN_RECV;
		else {
			sk->sk_state = TCP_ESTABLISHED;
			pipe_start_flow_control(sk);
		}
		break;

	case PNS_PEP_ENABLE_RESP:
		if (sk->sk_state != TCP_SYN_SENT)
			break;

		if (pep_enableresp_rcv(sk, skb)) {
			sk->sk_state = TCP_CLOSE_WAIT;
			break;
		}

		sk->sk_state = TCP_ESTABLISHED;
		pipe_start_flow_control(sk);
		break;

	case PNS_PEP_DISCONNECT_RESP:
		/* sock should already be dead, nothing to do */
		break;

	case PNS_PEP_STATUS_IND:
		pipe_rcv_status(sk, skb);
		break;
	}