Release 4.11 net/decnet/dn_nsp_in.c

/*
 * DECnet       An implementation of the DECnet protocol suite for the LINUX
 *              operating system.  DECnet is implemented using the  BSD Socket
 *              interface as the means of communication with the user level.
 *
 *              DECnet Network Services Protocol (Input)
 *
 * Author:      Eduardo Marcelo Serrat <emserrat@geocities.com>
 *
 * Changes:
 *
 *    Steve Whitehouse:  Split into dn_nsp_in.c and dn_nsp_out.c from
 *                       original dn_nsp.c.
 *    Steve Whitehouse:  Updated to work with my new routing architecture.
 *    Steve Whitehouse:  Add changes from Eduardo Serrat's patches.
 *    Steve Whitehouse:  Put all ack handling code in a common routine.
 *    Steve Whitehouse:  Put other common bits into dn_nsp_rx()
 *    Steve Whitehouse:  More checks on skb->len to catch bogus packets
 *                       Fixed various race conditions and possible nasties.
 *    Steve Whitehouse:  Now handles returned conninit frames.
 *     David S. Miller:  New socket locking
 *    Steve Whitehouse:  Fixed lockup when socket filtering was enabled.
 *         Paul Koning:  Fix to push CC sockets into RUN when acks are
 *                       received.
 *    Steve Whitehouse:
 *   Patrick Caulfield:  Checking conninits for correctness & sending of error
 *                       responses.
 *    Steve Whitehouse:  Added backlog congestion level return codes.
 *   Patrick Caulfield:
 *    Steve Whitehouse:  Added flow control support (outbound)
 *    Steve Whitehouse:  Prepare for nonlinear skbs
 */

/******************************************************************************
    (c) 1995-1998 E.M. Serrat           emserrat@geocities.com

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    any later version.

    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.
*******************************************************************************/

#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/netdevice.h>
#include <linux/inet.h>
#include <linux/route.h>
#include <linux/slab.h>
#include <net/sock.h>
#include <net/tcp_states.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/termios.h>
#include <linux/interrupt.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/init.h>
#include <linux/poll.h>
#include <linux/netfilter_decnet.h>
#include <net/neighbour.h>
#include <net/dst.h>
#include <net/dn.h>
#include <net/dn_nsp.h>
#include <net/dn_dev.h>
#include <net/dn_route.h>

extern int decnet_log_martians;



static void dn_log_martian(struct sk_buff *skb, const char *msg)
{
	if (decnet_log_martians) {
		char *devname = skb->dev ? skb->dev->name : "???";
		struct dn_skb_cb *cb = DN_SKB_CB(skb);
		net_info_ratelimited("DECnet: Martian packet (%s) dev=%s src=0x%04hx dst=0x%04hx srcport=0x%04hx dstport=0x%04hx\n",
				     msg, devname,
				     le16_to_cpu(cb->src),
				     le16_to_cpu(cb->dst),
				     le16_to_cpu(cb->src_port),
				     le16_to_cpu(cb->dst_port));
	}
}

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Linus Torvalds (pre-git)
69
81.18%
2
33.33%
Steven Whitehouse
8
9.41%
1
16.67%
Harvey Harrison
4
4.71%
1
16.67%
Linus Torvalds
3
3.53%
1
16.67%
Joe Perches
1
1.18%
1
16.67%
Total
85
100.00%
6
100.00%

/*
 * For this function we've flipped the cross-subchannel bit
 * if the message is an otherdata or linkservice message. Thus
 * we can use it to work out what to update.
 */


static void dn_ack(struct sock *sk, struct sk_buff *skb, unsigned short ack)
{
	struct dn_scp *scp = DN_SK(sk);
	unsigned short type = ((ack >> 12) & 0x0003);
	int wakeup = 0;

	switch (type) {
	case 0: /* ACK - Data */
		if (dn_after(ack, scp->ackrcv_dat)) {
			scp->ackrcv_dat = ack & 0x0fff;
			wakeup |= dn_nsp_check_xmit_queue(sk, skb,
							  &scp->data_xmit_queue,
							  ack);
		}
		break;
	case 1: /* NAK - Data */
		break;
	case 2: /* ACK - OtherData */
		if (dn_after(ack, scp->ackrcv_oth)) {
			scp->ackrcv_oth = ack & 0x0fff;
			wakeup |= dn_nsp_check_xmit_queue(sk, skb,
							  &scp->other_xmit_queue,
							  ack);
		}
		break;
	case 3: /* NAK - OtherData */
		break;
	}

	if (wakeup && !sock_flag(sk, SOCK_DEAD))
		sk->sk_state_change(sk);
}

Contributors
Person
Tokens
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Linus Torvalds (pre-git)
157
93.45%
1
16.67%
Arnaldo Carvalho de Melo
4
2.38%
2
33.33%
Linus Torvalds
3
1.79%
1
16.67%
James Morris
2
1.19%
1
16.67%
David S. Miller
2
1.19%
1
16.67%
Total
168
100.00%
6
100.00%

/*
 * This function is a universal ack processor.
 */


static int dn_process_ack(struct sock *sk, struct sk_buff *skb, int oth)
{
	__le16 *ptr = (__le16 *)skb->data;
	int len = 0;
	unsigned short ack;

	if (skb->len < 2)
		return len;

	if ((ack = le16_to_cpu(*ptr)) & 0x8000) {
		skb_pull(skb, 2);
		ptr++;
		len += 2;
		if ((ack & 0x4000) == 0) {
			if (oth)
				ack ^= 0x2000;
			dn_ack(sk, skb, ack);
		}
	}

	if (skb->len < 2)
		return len;

	if ((ack = le16_to_cpu(*ptr)) & 0x8000) {
		skb_pull(skb, 2);
		len += 2;
		if ((ack & 0x4000) == 0) {
			if (oth)
				ack ^= 0x2000;
			dn_ack(sk, skb, ack);
		}
	}

	return len;
}


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Linus Torvalds (pre-git)
176
97.78%
1
33.33%
Steven Whitehouse
2
1.11%
1
33.33%
Harvey Harrison
2
1.11%
1
33.33%
Total
180
100.00%
3
100.00%

/**
 * dn_check_idf - Check an image data field format is correct.
 * @pptr: Pointer to pointer to image data
 * @len: Pointer to length of image data
 * @max: The maximum allowed length of the data in the image data field
 * @follow_on: Check that this many bytes exist beyond the end of the image data
 *
 * Returns: 0 if ok, -1 on error
 */


static inline int dn_check_idf(unsigned char **pptr, int *len, unsigned char max, unsigned char follow_on)
{
	unsigned char *ptr = *pptr;
	unsigned char flen = *ptr++;

	(*len)--;
	if (flen > max)
		return -1;
	if ((flen + follow_on) > *len)
		return -1;

	*len -= flen;
	*pptr = ptr + flen;
	return 0;
}

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Linus Torvalds (pre-git)
87
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1
100.00%
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87
100.00%
1
100.00%

/*
 * Table of reason codes to pass back to node which sent us a badly
 * formed message, plus text messages for the log. A zero entry in
 * the reason field means "don't reply" otherwise a disc init is sent with
 * the specified reason code.
 */
static struct {
	
unsigned short reason;
	
const char *text;
} 
ci_err_table[] = {
 { 0,             "CI: Truncated message" },
 { NSP_REASON_ID, "CI: Destination username error" },
 { NSP_REASON_ID, "CI: Destination username type" },
 { NSP_REASON_US, "CI: Source username error" },
 { 0,             "CI: Truncated at menuver" },
 { 0,             "CI: Truncated before access or user data" },
 { NSP_REASON_IO, "CI: Access data format error" },
 { NSP_REASON_IO, "CI: User data format error" }
};

/*
 * This function uses a slightly different lookup method
 * to find its sockets, since it searches on object name/number
 * rather than port numbers. Various tests are done to ensure that
 * the incoming data is in the correct format before it is queued to
 * a socket.
 */


static struct sock *dn_find_listener(struct sk_buff *skb, unsigned short *reason)
{
	struct dn_skb_cb *cb = DN_SKB_CB(skb);
	struct nsp_conn_init_msg *msg = (struct nsp_conn_init_msg *)skb->data;
	struct sockaddr_dn dstaddr;
	struct sockaddr_dn srcaddr;
	unsigned char type = 0;
	int dstlen;
	int srclen;
	unsigned char *ptr;
	int len;
	int err = 0;
	unsigned char menuver;

	memset(&dstaddr, 0, sizeof(struct sockaddr_dn));
	memset(&srcaddr, 0, sizeof(struct sockaddr_dn));

	/*
         * 1. Decode & remove message header
         */
	cb->src_port = msg->srcaddr;
	cb->dst_port = msg->dstaddr;
	cb->services = msg->services;
	cb->info     = msg->info;
	cb->segsize  = le16_to_cpu(msg->segsize);

	if (!pskb_may_pull(skb, sizeof(*msg)))
		goto err_out;

	skb_pull(skb, sizeof(*msg));

	len = skb->len;
	ptr = skb->data;

	/*
         * 2. Check destination end username format
         */
	dstlen = dn_username2sockaddr(ptr, len, &dstaddr, &type);
	err++;
	if (dstlen < 0)
		goto err_out;

	err++;
	if (type > 1)
		goto err_out;

	len -= dstlen;
	ptr += dstlen;

	/*
         * 3. Check source end username format
         */
	srclen = dn_username2sockaddr(ptr, len, &srcaddr, &type);
	err++;
	if (srclen < 0)
		goto err_out;

	len -= srclen;
	ptr += srclen;
	err++;
	if (len < 1)
		goto err_out;

	menuver = *ptr;
	ptr++;
	len--;

	/*
         * 4. Check that optional data actually exists if menuver says it does
         */
	err++;
	if ((menuver & (DN_MENUVER_ACC | DN_MENUVER_USR)) && (len < 1))
		goto err_out;

	/*
         * 5. Check optional access data format
         */
	err++;
	if (menuver & DN_MENUVER_ACC) {
		if (dn_check_idf(&ptr, &len, 39, 1))
			goto err_out;
		if (dn_check_idf(&ptr, &len, 39, 1))
			goto err_out;
		if (dn_check_idf(&ptr, &len, 39, (menuver & DN_MENUVER_USR) ? 1 : 0))
			goto err_out;
	}

	/*
         * 6. Check optional user data format
         */
	err++;
	if (menuver & DN_MENUVER_USR) {
		if (dn_check_idf(&ptr, &len, 16, 0))
			goto err_out;
	}

	/*
         * 7. Look up socket based on destination end username
         */
	return dn_sklist_find_listener(&dstaddr);
err_out:
	dn_log_martian(skb, ci_err_table[err].text);
	*reason = ci_err_table[err].reason;
	return NULL;
}


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Linus Torvalds (pre-git)
453
98.05%
3
50.00%
Steven Whitehouse
5
1.08%
1
16.67%
Linus Torvalds
3
0.65%
1
16.67%
Harvey Harrison
1
0.22%
1
16.67%
Total
462
100.00%
6
100.00%



static void dn_nsp_conn_init(struct sock *sk, struct sk_buff *skb)
{
	if (sk_acceptq_is_full(sk)) {
		kfree_skb(skb);
		return;
	}

	sk->sk_ack_backlog++;
	skb_queue_tail(&sk->sk_receive_queue, skb);
	sk->sk_state_change(sk);
}

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Linus Torvalds (pre-git)
47
88.68%
2
50.00%
Arnaldo Carvalho de Melo
6
11.32%
2
50.00%
Total
53
100.00%
4
100.00%



static void dn_nsp_conn_conf(struct sock *sk, struct sk_buff *skb)
{
	struct dn_skb_cb *cb = DN_SKB_CB(skb);
	struct dn_scp *scp = DN_SK(sk);
	unsigned char *ptr;

	if (skb->len < 4)
		goto out;

	ptr = skb->data;
	cb->services = *ptr++;
	cb->info = *ptr++;
	cb->segsize = le16_to_cpu(*(__le16 *)ptr);

	if ((scp->state == DN_CI) || (scp->state == DN_CD)) {
		scp->persist = 0;
		scp->addrrem = cb->src_port;
		sk->sk_state = TCP_ESTABLISHED;
		scp->state = DN_RUN;
		scp->services_rem = cb->services;
		scp->info_rem = cb->info;
		scp->segsize_rem = cb->segsize;

		if ((scp->services_rem & NSP_FC_MASK) == NSP_FC_NONE)
			scp->max_window = decnet_no_fc_max_cwnd;

		if (skb->len > 0) {
			u16 dlen = *skb->data;
			if ((dlen <= 16) && (dlen <= skb->len)) {
				scp->conndata_in.opt_optl = cpu_to_le16(dlen);
				skb_copy_from_linear_data_offset(skb, 1,
					      scp->conndata_in.opt_data, dlen);
			}
		}
		dn_nsp_send_link(sk, DN_NOCHANGE, 0);
		if (!sock_flag(sk, SOCK_DEAD))
			sk->sk_state_change(sk);
	}

out:
	kfree_skb(skb);
}

Contributors
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Tokens
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Commits
CommitProp
Linus Torvalds (pre-git)
199
73.43%
1
10.00%
Linus Torvalds
54
19.93%
2
20.00%
Arnaldo Carvalho de Melo
10
3.69%
3
30.00%
Steven Whitehouse
4
1.48%
2
20.00%
Harvey Harrison
2
0.74%
1
10.00%
James Morris
2
0.74%
1
10.00%
Total
271
100.00%
10
100.00%



static void dn_nsp_conn_ack(struct sock *sk, struct sk_buff *skb)
{
	struct dn_scp *scp = DN_SK(sk);

	if (scp->state == DN_CI) {
		scp->state = DN_CD;
		scp->persist = 0;
	}

	kfree_skb(skb);
}

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Linus Torvalds (pre-git)
50
94.34%
1
50.00%
Linus Torvalds
3
5.66%
1
50.00%
Total
53
100.00%
2
100.00%



static void dn_nsp_disc_init(struct sock *sk, struct sk_buff *skb)
{
	struct dn_scp *scp = DN_SK(sk);
	struct dn_skb_cb *cb = DN_SKB_CB(skb);
	unsigned short reason;

	if (skb->len < 2)
		goto out;

	reason = le16_to_cpu(*(__le16 *)skb->data);
	skb_pull(skb, 2);

	scp->discdata_in.opt_status = cpu_to_le16(reason);
	scp->discdata_in.opt_optl   = 0;
	memset(scp->discdata_in.opt_data, 0, 16);

	if (skb->len > 0) {
		u16 dlen = *skb->data;
		if ((dlen <= 16) && (dlen <= skb->len)) {
			scp->discdata_in.opt_optl = cpu_to_le16(dlen);
			skb_copy_from_linear_data_offset(skb, 1, scp->discdata_in.opt_data, dlen);
		}
	}

	scp->addrrem = cb->src_port;
	sk->sk_state = TCP_CLOSE;

	switch (scp->state) {
	case DN_CI:
	case DN_CD:
		scp->state = DN_RJ;
		sk->sk_err = ECONNREFUSED;
		break;
	case DN_RUN:
		sk->sk_shutdown |= SHUTDOWN_MASK;
		scp->state = DN_DN;
		break;
	case DN_DI:
		scp->state = DN_DIC;
		break;
	}

	if (!sock_flag(sk, SOCK_DEAD)) {
		if (sk->sk_socket->state != SS_UNCONNECTED)
			sk->sk_socket->state = SS_DISCONNECTING;
		sk->sk_state_change(sk);
	}

	/*
         * It appears that its possible for remote machines to send disc
         * init messages with no port identifier if we are in the CI and
         * possibly also the CD state. Obviously we shouldn't reply with
         * a message if we don't know what the end point is.
         */
	if (scp->addrrem) {
		dn_nsp_send_disc(sk, NSP_DISCCONF, NSP_REASON_DC, GFP_ATOMIC);
	}
	scp->persist_fxn = dn_destroy_timer;
	scp->persist = dn_nsp_persist(sk);

out:
	kfree_skb(skb);
}

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Linus Torvalds (pre-git)
267
85.58%
2
15.38%
Steven Whitehouse
14
4.49%
3
23.08%
Arnaldo Carvalho de Melo
13
4.17%
3
23.08%
Patrick Caulfield
6
1.92%
1
7.69%
Linus Torvalds
6
1.92%
1
7.69%
Harvey Harrison
3
0.96%
1
7.69%
James Morris
2
0.64%
1
7.69%
Hideaki Yoshifuji / 吉藤英明
1
0.32%
1
7.69%
Total
312
100.00%
13
100.00%

/*
 * disc_conf messages are also called no_resources or no_link
 * messages depending upon the "reason" field.
 */


static void dn_nsp_disc_conf(struct sock *sk, struct sk_buff *skb)
{
	struct dn_scp *scp = DN_SK(sk);
	unsigned short reason;

	if (skb->len != 2)
		goto out;

	reason = le16_to_cpu(*(__le16 *)skb->data);

	sk->sk_state = TCP_CLOSE;

	switch (scp->state) {
	case DN_CI:
		scp->state = DN_NR;
		break;
	case DN_DR:
		if (reason == NSP_REASON_DC)
			scp->state = DN_DRC;
		if (reason == NSP_REASON_NL)
			scp->state = DN_CN;
		break;
	case DN_DI:
		scp->state = DN_DIC;
		break;
	case DN_RUN:
		sk->sk_shutdown |= SHUTDOWN_MASK;
	case DN_CC:
		scp->state = DN_CN;
	}

	if (!sock_flag(sk, SOCK_DEAD)) {
		if (sk->sk_socket->state != SS_UNCONNECTED)
			sk->sk_socket->state = SS_DISCONNECTING;
		sk->sk_state_change(sk);
	}

	scp->persist_fxn = dn_destroy_timer;
	scp->persist = dn_nsp_persist(sk);

out:
	kfree_skb(skb);
}

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Linus Torvalds (pre-git)
179
92.27%
3
33.33%
Arnaldo Carvalho de Melo
8
4.12%
2
22.22%
Linus Torvalds
3
1.55%
1
11.11%
James Morris
2
1.03%
1
11.11%
Harvey Harrison
1
0.52%
1
11.11%
Steven Whitehouse
1
0.52%
1
11.11%
Total
194
100.00%
9
100.00%



static void dn_nsp_linkservice(struct sock *sk, struct sk_buff *skb)
{
	struct dn_scp *scp = DN_SK(sk);
	unsigned short segnum;
	unsigned char lsflags;
	signed char fcval;
	int wake_up = 0;
	char *ptr = skb->data;
	unsigned char fctype = scp->services_rem & NSP_FC_MASK;

	if (skb->len != 4)
		goto out;

	segnum = le16_to_cpu(*(__le16 *)ptr);
	ptr += 2;
	lsflags = *(unsigned char *)ptr++;
	fcval = *ptr;

	/*
         * Here we ignore erronous packets which should really
         * should cause a connection abort. It is not critical
         * for now though.
         */
	if (lsflags & 0xf8)
		goto out;

	if (seq_next(scp->numoth_rcv, segnum)) {
		seq_add(&scp->numoth_rcv, 1);
		switch(lsflags & 0x04) { /* FCVAL INT */
		case 0x00: /* Normal Request */
			switch(lsflags & 0x03) { /* FCVAL MOD */
			case 0x00: /* Request count */
				if (fcval < 0) {
					unsigned char p_fcval = -fcval;
					if ((scp->flowrem_dat > p_fcval) &&
					    (fctype == NSP_FC_SCMC)) {
						scp->flowrem_dat -= p_fcval;
					}
				} else if (fcval > 0) {
					scp->flowrem_dat += fcval;
					wake_up = 1;
				}
				break;
			case 0x01: /* Stop outgoing data */
				scp->flowrem_sw = DN_DONTSEND;
				break;
			case 0x02: /* Ok to start again */
				scp->flowrem_sw = DN_SEND;
				dn_nsp_output(sk);
				wake_up = 1;
			}
			break;
		case 0x04: /* Interrupt Request */
			if (fcval > 0) {
				scp->flowrem_oth += fcval;
				wake_up = 1;
			}
			break;
		}
		if (wake_up && !sock_flag(sk, SOCK_DEAD))
			sk->sk_state_change(sk);
	}

	dn_nsp_send_oth_ack(sk);

out:
	kfree_skb(skb);
}

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Linus Torvalds
159
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11.11%
Linus Torvalds (pre-git)
138
44.95%
1
11.11%
Arnaldo Carvalho de Melo
4
1.30%
2
22.22%
James Morris
2
0.65%
1
11.11%
Steven Whitehouse
1
0.33%
1
11.11%
Hideaki Yoshifuji / 吉藤英明
1
0.33%
1
11.11%
Harvey Harrison
1
0.33%
1
11.11%
Olaf Hering
1
0.33%
1
11.11%
Total
307
100.00%
9
100.00%

/*
 * Copy of sock_queue_rcv_skb (from sock.h) without
 * bh_lock_sock() (its already held when this is called) which
 * also allows data and other data to be queued to a socket.
 */


static __inline__ int dn_queue_skb(struct sock *sk, struct sk_buff *skb, int sig, struct sk_buff_head *queue)
{
	int err;

	/* Cast skb->rcvbuf to unsigned... It's pointless, but reduces
           number of warnings when compiling with -W --ANK
         */
	if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
	    (unsigned int)sk->sk_rcvbuf) {
		err = -ENOMEM;
		goto out;
	}

	err = sk_filter(sk, skb);
	if (err)
		goto out;

	skb_set_owner_r(skb, sk);
	skb_queue_tail(queue, skb);

	if (!sock_flag(sk, SOCK_DEAD))
		sk->sk_data_ready(sk);
out:
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
85
75.22%
3
30.00%
James Morris
20
17.70%
2
20.00%
Arnaldo Carvalho de Melo
5
4.42%
2
20.00%
Hideaki Yoshifuji / 吉藤英明
1
0.88%
1
10.00%
Eric Dumazet
1
0.88%
1
10.00%
Steven Whitehouse
1
0.88%
1
10.00%
Total
113
100.00%
10
100.00%



static void dn_nsp_otherdata(struct sock *sk, struct sk_buff *skb)
{
	struct dn_scp *scp = DN_SK(sk);
	unsigned short segnum;
	struct dn_skb_cb *cb = DN_SKB_CB(skb);
	int queued = 0;

	if (skb->len < 2)
		goto out;

	cb->segnum = segnum = le16_to_cpu(*(__le16 *)skb->data);
	skb_pull(skb, 2);

	if (seq_next(scp->numoth_rcv, segnum)) {

		if (dn_queue_skb(sk, skb, SIGURG, &scp->other_receive_queue) == 0) {
			seq_add(&scp->numoth_rcv, 1);
			scp->other_report = 0;
			queued = 1;
		}
	}

	dn_nsp_send_oth_ack(sk);
out:
	if (!queued)
		kfree_skb(skb);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
131
86.75%
2
40.00%
Linus Torvalds
18
11.92%
1
20.00%
Harvey Harrison
1
0.66%
1
20.00%
Steven Whitehouse
1
0.66%
1
20.00%
Total
151
100.00%
5
100.00%



static void dn_nsp_data(struct sock *sk, struct sk_buff *skb)
{
	int queued = 0;
	unsigned short segnum;
	struct dn_skb_cb *cb = DN_SKB_CB(skb);
	struct dn_scp *scp = DN_SK(sk);

	if (skb->len < 2)
		goto out;

	cb->segnum = segnum = le16_to_cpu(*(__le16 *)skb->data);
	skb_pull(skb, 2);

	if (seq_next(scp->numdat_rcv, segnum)) {
		if (dn_queue_skb(sk, skb, SIGIO, &sk->sk_receive_queue) == 0) {
			seq_add(&scp->numdat_rcv, 1);
			queued = 1;
		}

		if ((scp->flowloc_sw == DN_SEND) && dn_congested(sk)) {
			scp->flowloc_sw = DN_DONTSEND;
			dn_nsp_send_link(sk, DN_DONTSEND, 0);
		}
	}

	dn_nsp_send_data_ack(sk);
out:
	if (!queued)
		kfree_skb(skb);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
153
86.44%
2
33.33%
Linus Torvalds
21
11.86%
1
16.67%
Steven Whitehouse
1
0.56%
1
16.67%
Arnaldo Carvalho de Melo
1
0.56%
1
16.67%
Harvey Harrison
1
0.56%
1
16.67%
Total
177
100.00%
6
100.00%

/*
 * If one of our conninit messages is returned, this function
 * deals with it. It puts the socket into the NO_COMMUNICATION
 * state.
 */


static void dn_returned_conn_init(struct sock *sk, struct sk_buff *skb)
{
	struct dn_scp *scp = DN_SK(sk);

	if (scp->state == DN_CI) {
		scp->state = DN_NC;
		sk->sk_state = TCP_CLOSE;
		if (!sock_flag(sk, SOCK_DEAD))
			sk->sk_state_change(sk);
	}

	kfree_skb(skb);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
60
85.71%
2
33.33%
Arnaldo Carvalho de Melo
5
7.14%
2
33.33%
Linus Torvalds
3
4.29%
1
16.67%
James Morris
2
2.86%
1
16.67%
Total
70
100.00%
6
100.00%



static int dn_nsp_no_socket(struct sk_buff *skb, unsigned short reason)
{
	struct dn_skb_cb *cb = DN_SKB_CB(skb);
	int ret = NET_RX_DROP;

	/* Must not reply to returned packets */
	if (cb->rt_flags & DN_RT_F_RTS)
		goto out;

	if ((reason != NSP_REASON_OK) && ((cb->nsp_flags & 0x0c) == 0x08)) {
		switch (cb->nsp_flags & 0x70) {
		case 0x10:
		case 0x60: /* (Retransmitted) Connect Init */
			dn_nsp_return_disc(skb, NSP_DISCINIT, reason);
			ret = NET_RX_SUCCESS;
			break;
		case 0x20: /* Connect Confirm */
			dn_nsp_return_disc(skb, NSP_DISCCONF, reason);
			ret = NET_RX_SUCCESS;
			break;
		}
	}

out:
	kfree_skb(skb);
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
89
72.36%
2
66.67%
Linus Torvalds
34
27.64%
1
33.33%
Total
123
100.00%
3
100.00%



static int dn_nsp_rx_packet(struct net *net, struct sock *sk2,
			    struct sk_buff *skb)
{
	struct dn_skb_cb *cb = DN_SKB_CB(skb);
	struct sock *sk = NULL;
	unsigned char *ptr = (unsigned char *)skb->data;
	unsigned short reason = NSP_REASON_NL;

	if (!pskb_may_pull(skb, 2))
		goto free_out;

	skb_reset_transport_header(skb);
	cb->nsp_flags = *ptr++;

	if (decnet_debug_level & 2)
		printk(KERN_DEBUG "dn_nsp_rx: Message type 0x%02x\n", (int)cb->nsp_flags);

	if (cb->nsp_flags & 0x83)
		goto free_out;

	/*
         * Filter out conninits and useless packet types
         */
	if ((cb->nsp_flags & 0x0c) == 0x08) {
		switch (cb->nsp_flags & 0x70) {
		case 0x00: /* NOP */
		case 0x70: /* Reserved */
		case 0x50: /* Reserved, Phase II node init */
			goto free_out;
		case 0x10:
		case 0x60:
			if (unlikely(cb->rt_flags & DN_RT_F_RTS))
				goto free_out;
			sk = dn_find_listener(skb, &reason);
			goto got_it;
		}
	}

	if (!pskb_may_pull(skb, 3))
		goto free_out;

	/*
         * Grab the destination address.
         */
	cb->dst_port = *(__le16 *)ptr;
	cb->src_port = 0;
	ptr += 2;

	/*
         * If not a connack, grab the source address too.
         */
	if (pskb_may_pull(skb, 5)) {
		cb->src_port = *(__le16 *)ptr;
		ptr += 2;
		skb_pull(skb, 5);
	}

	/*
         * Returned packets...
         * Swap src & dst and look up in the normal way.
         */
	if (unlikely(cb->rt_flags & DN_RT_F_RTS)) {
		__le16 tmp = cb->dst_port;
		cb->dst_port = cb->src_port;
		cb->src_port = tmp;
		tmp = cb->dst;
		cb->dst = cb->src;
		cb->src = tmp;
	}

	/*
         * Find the socket to which this skb is destined.
         */
	sk = dn_find_by_skb(skb);
got_it:
	if (sk != NULL) {
		struct dn_scp *scp = DN_SK(sk);

		/* Reset backoff */
		scp->nsp_rxtshift = 0;

		/*
                 * We linearize everything except data segments here.
                 */
		if (cb->nsp_flags & ~0x60) {
			if (unlikely(skb_linearize(skb)))
				goto free_out;
		}

		return sk_receive_skb(sk, skb, 0);
	}

	return dn_nsp_no_socket(skb, reason);

free_out:
	kfree_skb(skb);
	return NET_RX_DROP;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
256
64.16%
5
35.71%
Steven Whitehouse
117
29.32%
2
14.29%
Linus Torvalds
8
2.01%
1
7.14%
Arnaldo Carvalho de Melo
7
1.75%
3
21.43%
Eric W. Biedermann
5
1.25%
1
7.14%
David S. Miller
5
1.25%
1
7.14%
Herbert Xu
1
0.25%
1
7.14%
Total
399
100.00%
14
100.00%



int dn_nsp_rx(struct sk_buff *skb)
{
	return NF_HOOK(NFPROTO_DECNET, NF_DN_LOCAL_IN,
		       &init_net, NULL, skb, skb->dev, NULL,
		       dn_nsp_rx_packet);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
27
81.82%
2
40.00%
Eric W. Biedermann
3
9.09%
1
20.00%
David S. Miller
2
6.06%
1
20.00%
Jan Engelhardt
1
3.03%
1
20.00%
Total
33
100.00%
5
100.00%

/*
 * This is the main receive routine for sockets. It is called
 * from the above when the socket is not busy, and also from
 * sock_release() when there is a backlog queued up.
 */


int dn_nsp_backlog_rcv(struct sock *sk, struct sk_buff *skb)
{
	struct dn_scp *scp = DN_SK(sk);
	struct dn_skb_cb *cb = DN_SKB_CB(skb);

	if (cb->rt_flags & DN_RT_F_RTS) {
		if (cb->nsp_flags == 0x18 || cb->nsp_flags == 0x68)
			dn_returned_conn_init(sk, skb);
		else
			kfree_skb(skb);
		return NET_RX_SUCCESS;
	}

	/*
         * Control packet.
         */
	if ((cb->nsp_flags & 0x0c) == 0x08) {
		switch (cb->nsp_flags & 0x70) {
		case 0x10:
		case 0x60:
			dn_nsp_conn_init(sk, skb);
			break;
		case 0x20:
			dn_nsp_conn_conf(sk, skb);
			break;
		case 0x30:
			dn_nsp_disc_init(sk, skb);
			break;
		case 0x40:
			dn_nsp_disc_conf(sk, skb);
			break;
		}

	} else if (cb->nsp_flags == 0x24) {
		/*
                 * Special for connacks, 'cos they don't have
                 * ack data or ack otherdata info.
                 */
		dn_nsp_conn_ack(sk, skb);
	} else {
		int other = 1;

		/* both data and ack frames can kick a CC socket into RUN */
		if ((scp->state == DN_CC) && !sock_flag(sk, SOCK_DEAD)) {
			scp->state = DN_RUN;
			sk->sk_state = TCP_ESTABLISHED;
			sk->sk_state_change(sk);
		}

		if ((cb->nsp_flags & 0x1c) == 0)
			other = 0;
		if (cb->nsp_flags == 0x04)
			other = 0;

		/*
                 * Read out ack data here, this applies equally
                 * to data, other data, link serivce and both
                 * ack data and ack otherdata.
                 */
		dn_process_ack(sk, skb, other);

		/*
                 * If we've some sort of data here then call a
                 * suitable routine for dealing with it, otherwise
                 * the packet is an ack and can be discarded.
                 */
		if ((cb->nsp_flags & 0x0c) == 0) {

			if (scp->state != DN_RUN)
				goto free_out;

			switch (cb->nsp_flags) {
			case 0x10: /* LS */
				dn_nsp_linkservice(sk, skb);
				break;
			case 0x30: /* OD */
				dn_nsp_otherdata(sk, skb);
				break;
			default:
				dn_nsp_data(sk, skb);
			}

		} else { /* Ack, chuck it out here */
free_out:
			kfree_skb(skb);
		}
	}

	return NET_RX_SUCCESS;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
297
89.46%
3
37.50%
Steven Whitehouse
20
6.02%
1
12.50%
Linus Torvalds
8
2.41%
1
12.50%
Arnaldo Carvalho de Melo
5
1.51%
2
25.00%
James Morris
2
0.60%
1
12.50%
Total
332
100.00%
8
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
3080
82.33%
9
23.08%
Linus Torvalds
326
8.71%
2
5.13%
Steven Whitehouse
176
4.70%
5
12.82%
Arnaldo Carvalho de Melo
69
1.84%
8
20.51%
James Morris
34
0.91%
2
5.13%
Harvey Harrison
16
0.43%
1
2.56%
David S. Miller
14
0.37%
2
5.13%
Eric W. Biedermann
8
0.21%
2
5.13%
Patrick Caulfield
6
0.16%
1
2.56%
Hideaki Yoshifuji / 吉藤英明
4
0.11%
1
2.56%
Tejun Heo
3
0.08%
1
2.56%
Eric Dumazet
1
0.03%
1
2.56%
Jan Engelhardt
1
0.03%
1
2.56%
Olaf Hering
1
0.03%
1
2.56%
Joe Perches
1
0.03%
1
2.56%
Herbert Xu
1
0.03%
1
2.56%
Total
3741
100.00%
39
100.00%
Directory: net/decnet

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