linux/net/bridge/br_stp_bpdu.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *	Spanning tree protocol; BPDU handling
 *	Linux ethernet bridge
 *
 *	Authors:
 *	Lennert Buytenhek		<[email protected]>
 */

#include <linux/kernel.h>
#include <linux/netfilter_bridge.h>
#include <linux/etherdevice.h>
#include <linux/llc.h>
#include <linux/slab.h>
#include <linux/pkt_sched.h>
#include <net/net_namespace.h>
#include <net/llc.h>
#include <net/llc_pdu.h>
#include <net/stp.h>
#include <asm/unaligned.h>

#include "br_private.h"
#include "br_private_stp.h"

#define STP_HZ …

#define LLC_RESERVE …

static int br_send_bpdu_finish(struct net *net, struct sock *sk,
			       struct sk_buff *skb)
{ … }

static void br_send_bpdu(struct net_bridge_port *p,
			 const unsigned char *data, int length)
{ … }

static inline void br_set_ticks(unsigned char *dest, int j)
{ … }

static inline int br_get_ticks(const unsigned char *src)
{ … }

/* called under bridge lock */
void br_send_config_bpdu(struct net_bridge_port *p, struct br_config_bpdu *bpdu)
{ … }

/* called under bridge lock */
void br_send_tcn_bpdu(struct net_bridge_port *p)
{ … }

/*
 * Called from llc.
 *
 * NO locks, but rcu_read_lock
 */
void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
		struct net_device *dev)
{ … }