cregit-Linux how code gets into the kernel

Release 4.8 net/bridge/br_private.h

Directory: net/bridge
/*
 *      Linux ethernet bridge
 *
 *      Authors:
 *      Lennert Buytenhek               <buytenh@gnu.org>
 *
 *      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.
 */

#ifndef _BR_PRIVATE_H

#define _BR_PRIVATE_H

#include <linux/netdevice.h>
#include <linux/if_bridge.h>
#include <linux/netpoll.h>
#include <linux/u64_stats_sync.h>
#include <net/route.h>
#include <net/ip6_fib.h>
#include <linux/if_vlan.h>
#include <linux/rhashtable.h>


#define BR_HASH_BITS 8

#define BR_HASH_SIZE (1 << BR_HASH_BITS)


#define BR_HOLD_TIME (1*HZ)


#define BR_PORT_BITS	10

#define BR_MAX_PORTS	(1<<BR_PORT_BITS)


#define BR_VERSION	"2.3"

/* Control of forwarding link local multicast */

#define BR_GROUPFWD_DEFAULT	0
/* Don't allow forwarding of control protocols like STP, MAC PAUSE and LACP */

#define BR_GROUPFWD_RESTRICTED	0x0007u
/* The Nearest Customer Bridge Group Address, 01-80-C2-00-00-[00,0B,0C,0D,0F] */

#define BR_GROUPFWD_8021AD	0xB801u

/* Path to usermode spanning tree program */

#define BR_STP_PROG	"/sbin/bridge-stp"


typedef struct bridge_id bridge_id;

typedef struct mac_addr mac_addr;

typedef __u16 port_id;


struct bridge_id
{
	
unsigned char	prio[2];
	
unsigned char	addr[ETH_ALEN];
};


struct mac_addr
{
	
unsigned char	addr[ETH_ALEN];
};

#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
/* our own querier */

struct bridge_mcast_own_query {
	
struct timer_list	timer;
	
u32			startup_sent;
};

/* other querier */

struct bridge_mcast_other_query {
	
struct timer_list		timer;
	
unsigned long			delay_time;
};

/* selected querier */

struct bridge_mcast_querier {
	
struct br_ip addr;
	
struct net_bridge_port __rcu	*port;
};

/* IGMP/MLD statistics */

struct bridge_mcast_stats {
	
struct br_mcast_stats mstats;
	
struct u64_stats_sync syncp;
};
#endif


struct br_vlan_stats {
	
u64 rx_bytes;
	
u64 rx_packets;
	
u64 tx_bytes;
	
u64 tx_packets;
	
struct u64_stats_sync syncp;
};

/**
 * struct net_bridge_vlan - per-vlan entry
 *
 * @vnode: rhashtable member
 * @vid: VLAN id
 * @flags: bridge vlan flags
 * @stats: per-cpu VLAN statistics
 * @br: if MASTER flag set, this points to a bridge struct
 * @port: if MASTER flag unset, this points to a port struct
 * @refcnt: if MASTER flag set, this is bumped for each port referencing it
 * @brvlan: if MASTER flag unset, this points to the global per-VLAN context
 *          for this VLAN entry
 * @vlist: sorted list of VLAN entries
 * @rcu: used for entry destruction
 *
 * This structure is shared between the global per-VLAN entries contained in
 * the bridge rhashtable and the local per-port per-VLAN entries contained in
 * the port's rhashtable. The union entries should be interpreted depending on
 * the entry flags that are set.
 */

struct net_bridge_vlan {
	
struct rhash_head		vnode;
	
u16				vid;
	
u16				flags;
	
struct br_vlan_stats __percpu	*stats;
	union {
		
struct net_bridge	*br;
		
struct net_bridge_port	*port;
	};
	union {
		
atomic_t		refcnt;
		
struct net_bridge_vlan	*brvlan;
	};
	
struct list_head		vlist;

	
struct rcu_head			rcu;
};

/**
 * struct net_bridge_vlan_group
 *
 * @vlan_hash: VLAN entry rhashtable
 * @vlan_list: sorted VLAN entry list
 * @num_vlans: number of total VLAN entries
 * @pvid: PVID VLAN id
 *
 * IMPORTANT: Be careful when checking if there're VLAN entries using list
 *            primitives because the bridge can have entries in its list which
 *            are just for global context but not for filtering, i.e. they have
 *            the master flag set but not the brentry flag. If you have to check
 *            if there're "real" entries in the bridge please test @num_vlans
 */

struct net_bridge_vlan_group {
	
struct rhashtable		vlan_hash;
	
struct list_head		vlan_list;
	
u16				num_vlans;
	
u16				pvid;
};


struct net_bridge_fdb_entry
{
	
struct hlist_node		hlist;
	
struct net_bridge_port		*dst;

	
unsigned long			updated;
	
unsigned long			used;
	
mac_addr			addr;
	
__u16				vlan_id;
	
unsigned char			is_local:1,
					
is_static:1,
					
added_by_user:1,
					
added_by_external_learn:1;
	
struct rcu_head			rcu;
};


#define MDB_PG_FLAGS_PERMANENT	BIT(0)

#define MDB_PG_FLAGS_OFFLOAD	BIT(1)


struct net_bridge_port_group {
	
struct net_bridge_port		*port;
	
struct net_bridge_port_group __rcu *next;
	
struct hlist_node		mglist;
	
struct rcu_head			rcu;
	
struct timer_list		timer;
	
struct br_ip			addr;
	
unsigned char			flags;
};


struct net_bridge_mdb_entry
{
	
struct hlist_node		hlist[2];
	
struct net_bridge		*br;
	
struct net_bridge_port_group __rcu *ports;
	
struct rcu_head			rcu;
	
struct timer_list		timer;
	
struct br_ip			addr;
	
bool				mglist;
};


struct net_bridge_mdb_htable
{
	
struct hlist_head		*mhash;
	
struct rcu_head			rcu;
	
struct net_bridge_mdb_htable	*old;
	
u32				size;
	
u32				max;
	
u32				secret;
	
u32				ver;
};


struct net_bridge_port
{
	
struct net_bridge		*br;
	
struct net_device		*dev;
	
struct list_head		list;

	/* STP */
	
u8				priority;
	
u8				state;
	
u16				port_no;
	
unsigned char			topology_change_ack;
	
unsigned char			config_pending;
	
port_id				port_id;
	
port_id				designated_port;
	
bridge_id			designated_root;
	
bridge_id			designated_bridge;
	
u32				path_cost;
	
u32				designated_cost;
	
unsigned long			designated_age;

	
struct timer_list		forward_delay_timer;
	
struct timer_list		hold_timer;
	
struct timer_list		message_age_timer;
	
struct kobject			kobj;
	
struct rcu_head			rcu;

	
unsigned long 			flags;

#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
	
struct bridge_mcast_own_query	ip4_own_query;
#if IS_ENABLED(CONFIG_IPV6)
	
struct bridge_mcast_own_query	ip6_own_query;
#endif /* IS_ENABLED(CONFIG_IPV6) */
	
unsigned char			multicast_router;
	
struct bridge_mcast_stats	__percpu *mcast_stats;
	
struct timer_list		multicast_router_timer;
	
struct hlist_head		mglist;
	
struct hlist_node		rlist;
#endif

#ifdef CONFIG_SYSFS
	
char				sysfs_name[IFNAMSIZ];
#endif

#ifdef CONFIG_NET_POLL_CONTROLLER
	
struct netpoll			*np;
#endif
#ifdef CONFIG_BRIDGE_VLAN_FILTERING
	
struct net_bridge_vlan_group	__rcu *vlgrp;
#endif
};


#define br_auto_port(p) ((p)->flags & BR_AUTO_MASK)

#define br_promisc_port(p) ((p)->flags & BR_PROMISC)


#define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)


static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev) { return rcu_dereference(dev->rx_handler_data); }

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static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev) { return br_port_exists(dev) ? rtnl_dereference(dev->rx_handler_data) : NULL; }

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struct net_bridge { spinlock_t lock; struct list_head port_list; struct net_device *dev; struct pcpu_sw_netstats __percpu *stats; spinlock_t hash_lock; struct hlist_head hash[BR_HASH_SIZE]; #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) union { struct rtable fake_rtable; struct rt6_info fake_rt6_info; }; bool nf_call_iptables; bool nf_call_ip6tables; bool nf_call_arptables; #endif u16 group_fwd_mask; u16 group_fwd_mask_required; /* STP */ bridge_id designated_root; bridge_id bridge_id; u32 root_path_cost; unsigned long max_age; unsigned long hello_time; unsigned long forward_delay; unsigned long bridge_max_age; unsigned long ageing_time; unsigned long bridge_hello_time; unsigned long bridge_forward_delay; u8 group_addr[ETH_ALEN]; bool group_addr_set; u16 root_port; enum { BR_NO_STP, /* no spanning tree */ BR_KERNEL_STP, /* old STP in kernel */ BR_USER_STP, /* new RSTP in userspace */ } stp_enabled; unsigned char topology_change; unsigned char topology_change_detected; #ifdef CONFIG_BRIDGE_IGMP_SNOOPING unsigned char multicast_router; u8 multicast_disabled:1; u8 multicast_querier:1; u8 multicast_query_use_ifaddr:1; u8 has_ipv6_addr:1; u8 multicast_stats_enabled:1; u32 hash_elasticity; u32 hash_max; u32 multicast_last_member_count; u32 multicast_startup_query_count; unsigned long multicast_last_member_interval; unsigned long multicast_membership_interval; unsigned long multicast_querier_interval; unsigned long multicast_query_interval; unsigned long multicast_query_response_interval; unsigned long multicast_startup_query_interval; spinlock_t multicast_lock; struct net_bridge_mdb_htable __rcu *mdb; struct hlist_head router_list; struct timer_list multicast_router_timer; struct bridge_mcast_other_query ip4_other_query; struct bridge_mcast_own_query ip4_own_query; struct bridge_mcast_querier ip4_querier; struct bridge_mcast_stats __percpu *mcast_stats; #if IS_ENABLED(CONFIG_IPV6) struct bridge_mcast_other_query ip6_other_query; struct bridge_mcast_own_query ip6_own_query; struct bridge_mcast_querier ip6_querier; #endif /* IS_ENABLED(CONFIG_IPV6) */ #endif struct timer_list hello_timer; struct timer_list tcn_timer; struct timer_list topology_change_timer; struct timer_list gc_timer; struct kobject *ifobj; u32 auto_cnt; #ifdef CONFIG_BRIDGE_VLAN_FILTERING struct net_bridge_vlan_group __rcu *vlgrp; u8 vlan_enabled; u8 vlan_stats_enabled; __be16 vlan_proto; u16 default_pvid; #endif }; struct br_input_skb_cb { struct net_device *brdev; #ifdef CONFIG_BRIDGE_IGMP_SNOOPING int igmp; int mrouters_only; #endif bool proxyarp_replied; #ifdef CONFIG_BRIDGE_VLAN_FILTERING bool vlan_filtered; #endif }; #define BR_INPUT_SKB_CB(__skb) ((struct br_input_skb_cb *)(__skb)->cb) #ifdef CONFIG_BRIDGE_IGMP_SNOOPING # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (BR_INPUT_SKB_CB(__skb)->mrouters_only) #else # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (0) #endif #define br_printk(level, br, format, args...) \ printk(level "%s: " format, (br)->dev->name, ##args) #define br_err(__br, format, args...) \ br_printk(KERN_ERR, __br, format, ##args) #define br_warn(__br, format, args...) \ br_printk(KERN_WARNING, __br, format, ##args) #define br_notice(__br, format, args...) \ br_printk(KERN_NOTICE, __br, format, ##args) #define br_info(__br, format, args...) \ br_printk(KERN_INFO, __br, format, ##args) #define br_debug(br, format, args...) \ pr_debug("%s: " format, (br)->dev->name, ##args) /* called under bridge lock */
static inline int br_is_root_bridge(const struct net_bridge *br) { return !memcmp(&br->bridge_id, &br->designated_root, 8); }

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/* check if a VLAN entry is global */
static inline bool br_vlan_is_master(const struct net_bridge_vlan *v) { return v->flags & BRIDGE_VLAN_INFO_MASTER; }

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/* check if a VLAN entry is used by the bridge */
static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v) { return v->flags & BRIDGE_VLAN_INFO_BRENTRY; }

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/* check if we should use the vlan entry, returns false if it's only context */
static inline bool br_vlan_should_use(const struct net_bridge_vlan *v) { if (br_vlan_is_master(v)) { if (br_vlan_is_brentry(v)) return true; else return false; } return true; }

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/* br_device.c */ void br_dev_setup(struct net_device *dev); void br_dev_delete(struct net_device *dev, struct list_head *list); netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev); #ifdef CONFIG_NET_POLL_CONTROLLER
static inline void br_netpoll_send_skb(const struct net_bridge_port *p, struct sk_buff *skb) { struct netpoll *np = p->np; if (np) netpoll_send_skb(np, skb); }

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int br_netpoll_enable(struct net_bridge_port *p); void br_netpoll_disable(struct net_bridge_port *p); #else
static inline void br_netpoll_send_skb(const struct net_bridge_port *p, struct sk_buff *skb) { }

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static inline int br_netpoll_enable(struct net_bridge_port *p) { return 0; }

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static inline void br_netpoll_disable(struct net_bridge_port *p) { }

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#endif /* br_fdb.c */ int br_fdb_init(void); void br_fdb_fini(void); void br_fdb_flush(struct net_bridge *br); void br_fdb_find_delete_local(struct net_bridge *br, const struct net_bridge_port *p, const unsigned char *addr, u16 vid); void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr); void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr); void br_fdb_cleanup(unsigned long arg); void br_fdb_delete_by_port(struct net_bridge *br, const struct net_bridge_port *p, u16 vid, int do_all); struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br, const unsigned char *addr, __u16 vid); int br_fdb_test_addr(struct net_device *dev, unsigned char *addr); int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count, unsigned long off); int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source, const unsigned char *addr, u16 vid); void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source, const unsigned char *addr, u16 vid, bool added_by_user); int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], struct net_device *dev, const unsigned char *addr, u16 vid); int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev, const unsigned char *addr, u16 vid, u16 nlh_flags); int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb, struct net_device *dev, struct net_device *fdev, int idx); int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p); void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p); int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p, const unsigned char *addr, u16 vid); int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p, const unsigned char *addr, u16 vid); /* br_forward.c */ int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb); void br_forward(const struct net_bridge_port *to, struct sk_buff *skb, bool local_rcv, bool local_orig); int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb); void br_flood(struct net_bridge *br, struct sk_buff *skb, bool unicast, bool local_rcv, bool local_orig); /* br_if.c */ void br_port_carrier_check(struct net_bridge_port *p); int br_add_bridge(struct net *net, const char *name); int br_del_bridge(struct net *net, const char *name); int br_add_if(struct net_bridge *br, struct net_device *dev); int br_del_if(struct net_bridge *br, struct net_device *dev); int br_min_mtu(const struct net_bridge *br); netdev_features_t br_features_recompute(struct net_bridge *br, netdev_features_t features); void br_port_flags_change(struct net_bridge_port *port, unsigned long mask); void br_manage_promisc(struct net_bridge *br); /* br_input.c */ int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb); rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
static inline bool br_rx_handler_check_rcu(const struct net_device *dev) { return rcu_dereference(dev->rx_handler) == br_handle_frame; }

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static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev) { return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL; }

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/* br_ioctl.c */ int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd); int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *arg); /* br_multicast.c */ #ifdef CONFIG_BRIDGE_IGMP_SNOOPING extern unsigned int br_mdb_rehash_seq; int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, struct sk_buff *skb, u16 vid); struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, struct sk_buff *skb, u16 vid); int br_multicast_add_port(struct net_bridge_port *port); void br_multicast_del_port(struct net_bridge_port *port); void br_multicast_enable_port(struct net_bridge_port *port); void br_multicast_disable_port(struct net_bridge_port *port); void br_multicast_init(struct net_bridge *br); void br_multicast_open(struct net_bridge *br); void br_multicast_stop(struct net_bridge *br); void br_multicast_dev_del(struct net_bridge *br); void br_multicast_flood(struct net_bridge_mdb_entry *mdst, struct sk_buff *skb, bool local_rcv, bool local_orig); int br_multicast_set_router(struct net_bridge *br, unsigned long val); int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val); int br_multicast_toggle(struct net_bridge *br, unsigned long val); int br_multicast_set_querier(struct net_bridge *br, unsigned long val); int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val); struct net_bridge_mdb_entry * br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst); struct net_bridge_mdb_entry * br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port, struct br_ip *group); void br_multicast_free_pg(struct rcu_head *head); struct net_bridge_port_group * br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group, struct net_bridge_port_group __rcu *next, unsigned char flags); void br_mdb_init(void); void br_mdb_uninit(void); void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port, struct br_ip *group, int type, u8 flags); void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port, int type); void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p, const struct sk_buff *skb, u8 type, u8 dir); int br_multicast_init_stats(struct net_bridge *br); void br_multicast_get_stats(const struct net_bridge *br, const struct net_bridge_port *p, struct br_mcast_stats *dest); #define mlock_dereference(X, br) \ rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
static inline bool br_multicast_is_router(struct net_bridge *br) { return br->multicast_router == 2 || (br->multicast_router == 1 && timer_pending(&br->multicast_router_timer)); }

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static inline bool __br_multicast_querier_exists(struct net_bridge *br, struct bridge_mcast_other_query *querier, const bool is_ipv6) { bool own_querier_enabled; if (br->multicast_querier) { if (is_ipv6 && !br->has_ipv6_addr) own_querier_enabled = false; else own_querier_enabled = true; } else { own_querier_enabled = false; } return time_is_before_jiffies(querier->delay_time) && (own_querier_enabled || timer_pending(&querier->timer)); }

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static inline bool br_multicast_querier_exists(struct net_bridge *br, struct ethhdr *eth) { switch (eth->h_proto) { case (htons(ETH_P_IP)): return __br_multicast_querier_exists(br, &br->ip4_other_query, false); #if IS_ENABLED(CONFIG_IPV6) case (htons(ETH_P_IPV6)): return __br_multicast_querier_exists(br, &br->ip6_other_query, true); #endif default: return false; } }

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static inline int br_multicast_igmp_type(const struct sk_buff *skb) { return BR_INPUT_SKB_CB(skb)->igmp; }

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#else
static inline int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, struct sk_buff *skb, u16 vid) { return 0; }

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static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, struct sk_buff *skb, u16 vid) { return NULL; }

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static inline int br_multicast_add_port(struct net_bridge_port *port) { return 0; }

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static inline void br_multicast_del_port(struct net_bridge_port *port) { }

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static inline void br_multicast_enable_port(struct net_bridge_port *port) { }

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static inline void br_multicast_disable_port(