/* ar-skbuff.c: socket buffer destruction handling
 *
 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.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 (at your option) any later version.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/net.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <net/af_rxrpc.h>
#include "ar-internal.h"

#define select_skb_count(op) (op >= rxrpc_skb_tx_cleaned ? &rxrpc_n_tx_skbs : &rxrpc_n_rx_skbs)

/*
 * Note the allocation or reception of a socket buffer.
 */
void rxrpc_new_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
{
	const void *here = __builtin_return_address(0);
	int n = atomic_inc_return(select_skb_count(op));
	trace_rxrpc_skb(skb, op, atomic_read(&skb->users), n, here);
}

/*
 * Note the re-emergence of a socket buffer from a queue or buffer.
 */
void rxrpc_see_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
{
	const void *here = __builtin_return_address(0);
	if (skb) {
		int n = atomic_read(select_skb_count(op));
		trace_rxrpc_skb(skb, op, atomic_read(&skb->users), n, here);
	}
}

/*
 * Note the addition of a ref on a socket buffer.
 */
void rxrpc_get_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
{
	const void *here = __builtin_return_address(0);
	int n = atomic_inc_return(select_skb_count(op));
	trace_rxrpc_skb(skb, op, atomic_read(&skb->users), n, here);
	skb_get(skb);
}

/*
 * Note the destruction of a socket buffer.
 */
void rxrpc_free_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
{
	const void *here = __builtin_return_address(0);
	if (skb) {
		int n;
		CHECK_SLAB_OKAY(&skb->users);
		n = atomic_dec_return(select_skb_count(op));
		trace_rxrpc_skb(skb, op, atomic_read(&skb->users), n, here);
		kfree_skb(skb);
	}
}

/*
 * Note the injected loss of a socket buffer.
 */
void rxrpc_lose_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
{
	const void *here = __builtin_return_address(0);
	if (skb) {
		int n;
		CHECK_SLAB_OKAY(&skb->users);
		n = atomic_dec_return(select_skb_count(op));
		trace_rxrpc_skb(skb, op, atomic_read(&skb->users), n, here);
		kfree_skb(skb);
	}
}

/*
 * Clear a queue of socket buffers.
 */
void rxrpc_purge_queue(struct sk_buff_head *list)
{
	const void *here = __builtin_return_address(0);
	struct sk_buff *skb;
	while ((skb = skb_dequeue((list))) != NULL) {
		int n = atomic_dec_return(select_skb_count(rxrpc_skb_rx_purged));
		trace_rxrpc_skb(skb, rxrpc_skb_rx_purged,
				atomic_read(&skb->users), n, here);
		kfree_skb(skb);
	}
}
94411aaf8b17bb58c8efe5'>root</a>/<a href='/cgit.cgi/linux/net-next.git/log/include?id=0ae8133586ad1c9be894411aaf8b17bb58c8efe5'>include</a>/<a href='/cgit.cgi/linux/net-next.git/log/include/net?id=0ae8133586ad1c9be894411aaf8b17bb58c8efe5'>net</a>/<a href='/cgit.cgi/linux/net-next.git/log/include/net/bluetooth?id=0ae8133586ad1c9be894411aaf8b17bb58c8efe5'>bluetooth</a>/<a href='/cgit.cgi/linux/net-next.git/log/include/net/bluetooth/l2cap.h?id=0ae8133586ad1c9be894411aaf8b17bb58c8efe5'>l2cap.h</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/include/net/bluetooth/l2cap.h?id=0ae8133586ad1c9be894411aaf8b17bb58c8efe5&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>
href='/cgit.cgi/linux/net-next.git/commit/net/bridge?h=nds-private-remove&amp;id=52e01b84a244473074fc0612c169e2e043d58b01'>Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next</a></td><td>David S. Miller</td><td>3</td><td><span class='deletions'>-32</span>/<span class='insertions'>+49</span></td></tr>
<tr><td><span title='2017-02-03 15:21:22 -0500'>2017-02-03</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/net/bridge?h=nds-private-remove&amp;id=11538d039ac6efcf4f1a6c536e1b87cd3668a9fd'>bridge: vlan dst_metadata hooks in ingress and egress paths</a></td><td>Roopa Prabhu</td><td>6</td><td><span class='deletions'>-2</span>/<span class='insertions'>+82</span></td></tr>
<tr><td><span title='2017-02-03 15:21:22 -0500'>2017-02-03</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/net/bridge?h=nds-private-remove&amp;id=efa5356b0d9753b9d7e63e41459eba106cce30f3'>bridge: per vlan dst_metadata netlink support</a></td><td>Roopa Prabhu</td><td>7</td><td><span class='deletions'>-48</span>/<span class='insertions'>+641</span></td></tr>
<tr><td><span title='2017-02-02 14:31:58 +0100'>2017-02-02</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/net/bridge?h=nds-private-remove&amp;id=2851940ffee313e0ff12540a8e11a8c54dea9c65'>netfilter: allow logging from non-init namespaces</a></td><td>Michal Kubeček</td><td>1</td><td><span class='deletions'>-1</span>/<span class='insertions'>+1</span></td></tr>