#include <sys/cdefs.h>
#include "opt_inet.h"
#include <sys/param.h>
#include <sys/eventhandler.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/queue.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/malloc.h>
#include <sys/proc.h>
#include <sys/socket.h>
#include <sys/syslog.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/netisr.h>
#include <net/ethernet.h>
#include <net/route.h>
#include <net/route/nhop.h>
#include <net/vnet.h>
#include <netinet/in.h>
#include <netinet/in_fib.h>
#include <netinet/in_var.h>
#include <net/if_llatbl.h>
#include <netinet/if_ether.h>
#include <security/mac/mac_framework.h>

Include dependency graph for if_ether.c:

Macros
#define	SIN(s) ((const struct sockaddr_in *)(s))

#define	V_arpt_keep VNET(arpt_keep)

#define	V_arpt_down VNET(arpt_down)

#define	V_arpt_rexmit VNET(arpt_rexmit)

#define	V_arp_maxtries VNET(arp_maxtries)

#define	V_arp_proxyall VNET(arp_proxyall)

#define	V_arp_maxhold VNET(arp_maxhold)

#define	MAX_GARP_RETRANSMITS 16

#define	V_arp_log_level VNET(arp_log_level)

#define	ARP_LOG(pri, ...)

Enumerations
enum	arp_llinfo_state { ARP_LLINFO_INCOMPLETE = 0 , ARP_LLINFO_REACHABLE , ARP_LLINFO_VERIFY , ARP_LLINFO_DELETED }

Functions
	__FBSDID ("$FreeBSD$")

	SYSCTL_DECL (_net_link_ether)

static	SYSCTL_NODE (_net_link_ether, PF_INET, inet, CTLFLAG_RW\|CTLFLAG_MPSAFE, 0, "")

static	SYSCTL_NODE (_net_link_ether, PF_ARP, arp, CTLFLAG_RW\|CTLFLAG_MPSAFE, 0, "")

	VNET_DEFINE_STATIC (int, arpt_keep)

	VNET_DEFINE_STATIC (int, arp_maxtries)

	VNET_DEFINE_STATIC (int, arp_proxyall)=0

	VNET_DEFINE_STATIC (int, arpt_down)

	VNET_DEFINE_STATIC (int, arpt_rexmit)

	VNET_PCPUSTAT_DEFINE (struct arpstat, arpstat)

	VNET_PCPUSTAT_SYSINIT (arpstat)

	VNET_DEFINE_STATIC (int, arp_maxhold)

	SYSCTL_INT (_net_link_ether_inet, OID_AUTO, max_age, CTLFLAG_VNET\|CTLFLAG_RW, &VNET_NAME(arpt_keep), 0, "ARP entry lifetime in seconds")

	SYSCTL_INT (_net_link_ether_inet, OID_AUTO, maxtries, CTLFLAG_VNET\|CTLFLAG_RW, &VNET_NAME(arp_maxtries), 0, "ARP resolution attempts before returning error")

	SYSCTL_INT (_net_link_ether_inet, OID_AUTO, proxyall, CTLFLAG_VNET\|CTLFLAG_RW, &VNET_NAME(arp_proxyall), 0, "Enable proxy ARP for all suitable requests")

	SYSCTL_INT (_net_link_ether_inet, OID_AUTO, wait, CTLFLAG_VNET\|CTLFLAG_RW, &VNET_NAME(arpt_down), 0, "Incomplete ARP entry lifetime in seconds")

	SYSCTL_VNET_PCPUSTAT (_net_link_ether_arp, OID_AUTO, stats, struct arpstat, arpstat, "ARP statistics (struct arpstat, net/if_arp.h)")

	SYSCTL_INT (_net_link_ether_inet, OID_AUTO, maxhold, CTLFLAG_VNET\|CTLFLAG_RW, &VNET_NAME(arp_maxhold), 0, "Number of packets to hold per ARP entry")

	SYSCTL_INT (_net_link_ether_inet, OID_AUTO, max_log_per_second, CTLFLAG_RW, &arp_maxpps, 0, "Maximum number of remotely triggered ARP messages that can be " "logged per second")

static int	sysctl_garp_rexmit (SYSCTL_HANDLER_ARGS)

	SYSCTL_PROC (_net_link_ether_inet, OID_AUTO, garp_rexmit_count, CTLTYPE_INT\|CTLFLAG_RW\|CTLFLAG_MPSAFE, &garp_rexmit_count, 0, sysctl_garp_rexmit, "I", "Number of times to retransmit GARP packets;" " 0 to disable, maximum of 16")

	VNET_DEFINE_STATIC (int, arp_log_level)

	SYSCTL_INT (_net_link_ether_arp, OID_AUTO, log_level, CTLFLAG_VNET\|CTLFLAG_RW, &VNET_NAME(arp_log_level), 0, "Minimum log(9) level for recording rate limited arp log messages. " "The higher will be log more (emerg=0, info=6 (default), debug=7).")

static void	arpintr (struct mbuf *)

static void	arptimer (void *)

static void	arp_check_update_lle (struct arphdr ah, struct in_addr isaddr, struct ifnet ifp, int bridged, struct llentry *la)

static void	arp_mark_lle_reachable (struct llentry *la)

static void	arp_iflladdr (void arg __unused, struct ifnet ifp)

static int	arp_fillheader (struct ifnet ifp, struct arphdr ah, int bcast, u_char buf, size_t bufsize)

static int	arprequest_internal (struct ifnet ifp, const struct in_addr sip, const struct in_addr tip, u_char enaddr)

void	arprequest (struct ifnet ifp, const struct in_addr sip, const struct in_addr tip, u_char enaddr)

static int	arpresolve_full (struct ifnet ifp, int is_gw, int flags, struct mbuf m, const struct sockaddr dst, u_char desten, uint32_t pflags, struct llentry *plle)

int	arpresolve (struct ifnet ifp, int is_gw, struct mbuf m, const struct sockaddr dst, u_char desten, uint32_t pflags, struct llentry *plle)

static struct mbuf *	arp_grab_holdchain (struct llentry *la)

static void	arp_flush_holdchain (struct ifnet ifp, struct llentry la, struct mbuf *chain)

static __noinline void	arp_add_ifa_lle (struct ifnet ifp, const struct sockaddr dst)

static void	garp_rexmit (void *arg)

static void	garp_timer_start (struct ifaddr *ifa)

void	arp_ifinit (struct ifnet ifp, struct ifaddr ifa)

void	arp_announce_ifaddr (struct ifnet ifp, struct in_addr addr, u_char enaddr)

static __noinline void	arp_handle_ifllchange (struct ifnet *ifp)

static void	vnet_arp_init (void)

	VNET_SYSINIT (vnet_arp_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_SECOND, vnet_arp_init, 0)

Variables
static struct timeval	arp_lastlog

static int	arp_curpps

static int	arp_maxpps = 1

static int	garp_rexmit_count = 0

static eventhandler_tag	iflladdr_tag

static const struct netisr_handler	arp_nh

Macro Definition Documentation

◆ ARP_LOG

#define ARP_LOG	(	pri,
		...
	)

Value:

        do {                                    \
        if ((pri) <= V_arp_log_level &&                                 \
            ppsratecheck(&arp_lastlog, &arp_curpps, arp_maxpps))        \
                log((pri), "arp: " __VA_ARGS__);                        \
} while (0)

Definition at line 175 of file if_ether.c.

◆ MAX_GARP_RETRANSMITS

#define MAX_GARP_RETRANSMITS 16

Definition at line 159 of file if_ether.c.

◆ SIN

#define SIN ( s ) ((const struct sockaddr_in *)(s))

Definition at line 79 of file if_ether.c.

◆ V_arp_log_level

#define V_arp_log_level VNET(arp_log_level)

Definition at line 170 of file if_ether.c.

◆ V_arp_maxhold

#define V_arp_maxhold VNET(arp_maxhold)

Definition at line 123 of file if_ether.c.

◆ V_arp_maxtries

#define V_arp_maxtries VNET(arp_maxtries)

Definition at line 121 of file if_ether.c.

◆ V_arp_proxyall

#define V_arp_proxyall VNET(arp_proxyall)

Definition at line 122 of file if_ether.c.

◆ V_arpt_down

#define V_arpt_down VNET(arpt_down)

Definition at line 119 of file if_ether.c.

◆ V_arpt_keep

#define V_arpt_keep VNET(arpt_keep)

Definition at line 118 of file if_ether.c.

◆ V_arpt_rexmit

#define V_arpt_rexmit VNET(arpt_rexmit)

Definition at line 120 of file if_ether.c.

Enumeration Type Documentation

◆ arp_llinfo_state

enum arp_llinfo_state

Enumerator
ARP_LLINFO_INCOMPLETE
ARP_LLINFO_REACHABLE
ARP_LLINFO_VERIFY
ARP_LLINFO_DELETED

Definition at line 86 of file if_ether.c.

Function Documentation

◆ __FBSDID()

__FBSDID ( "$FreeBSD$" )

◆ arp_add_ifa_lle()

static __noinline void arp_add_ifa_lle	(	struct ifnet *	ifp,
		const struct sockaddr *	dst
	)

static

Definition at line 1294 of file if_ether.c.

References LLTABLE.

Referenced by arp_ifinit().

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◆ arp_announce_ifaddr()

void arp_announce_ifaddr	(	struct ifnet *	ifp,
		struct in_addr	addr,
		u_char *	enaddr
	)

Definition at line 1462 of file if_ether.c.

References arprequest(), INADDR_ANY, and in_addr::s_addr.

Referenced by arp_ifinit().

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◆ arp_check_update_lle()

static void arp_check_update_lle	(	struct arphdr *	ah,
		struct in_addr	isaddr,
		struct ifnet *	ifp,
		int	bridged,
		struct llentry *	la
	)

static

Definition at line 1181 of file if_ether.c.

References arp_flush_holdchain(), arp_grab_holdchain(), ARP_LOG, arp_mark_lle_reachable(), and inet_ntoa_r().

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◆ arp_fillheader()

static int arp_fillheader	(	struct ifnet *	ifp,
		struct arphdr *	ah,
		int	bcast,
		u_char *	buf,
		size_t *	bufsize
	)

static

Definition at line 318 of file if_ether.c.

Referenced by arprequest_internal().

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◆ arp_flush_holdchain()

static void arp_flush_holdchain	(	struct ifnet *	ifp,
		struct llentry *	la,
		struct mbuf *	chain
	)

static

Definition at line 1153 of file if_ether.c.

Referenced by arp_check_update_lle().

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◆ arp_grab_holdchain()

static struct mbuf * arp_grab_holdchain ( struct llentry * la )

static

Definition at line 1139 of file if_ether.c.

Referenced by arp_check_update_lle().

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◆ arp_handle_ifllchange()

static __noinline void arp_handle_ifllchange ( struct ifnet * ifp )

static

Definition at line 1474 of file if_ether.c.

References arp_ifinit().

Referenced by arp_iflladdr().

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◆ arp_ifinit()

void arp_ifinit	(	struct ifnet *	ifp,
		struct ifaddr *	ifa
	)

Definition at line 1437 of file if_ether.c.

References arp_add_ifa_lle(), arp_announce_ifaddr(), garp_rexmit_count, garp_timer_start(), INADDR_ANY, in_addr::s_addr, and sockaddr_in::sin_addr.

Referenced by arp_handle_ifllchange().

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◆ arp_iflladdr()

static void arp_iflladdr	(	void *arg	__unused,
		struct ifnet *	ifp
	)

static

Definition at line 1488 of file if_ether.c.

References arp_handle_ifllchange(), and LLTABLE.

Referenced by vnet_arp_init().

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◆ arp_mark_lle_reachable()

static void arp_mark_lle_reachable ( struct llentry * la )

static

Definition at line 1266 of file if_ether.c.

References ARP_LLINFO_REACHABLE, arptimer(), V_arp_maxtries, V_arpt_keep, and V_arpt_rexmit.

Referenced by arp_check_update_lle().

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◆ arpintr()

static void arpintr ( struct mbuf * m )

static

Definition at line 668 of file if_ether.c.

References ARP_LOG.

◆ arprequest()

void arprequest	(	struct ifnet *	ifp,
		const struct in_addr *	sip,
		const struct in_addr *	tip,
		u_char *	enaddr
	)

Definition at line 443 of file if_ether.c.

References arprequest_internal().

Referenced by arp_announce_ifaddr(), arptimer(), and garp_rexmit().

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◆ arprequest_internal()

static int arprequest_internal	(	struct ifnet *	ifp,
		const struct in_addr *	sip,
		const struct in_addr *	tip,
		u_char *	enaddr
	)

static

Definition at line 348 of file if_ether.c.

References arp_fillheader(), ARP_LOG, IA_MASKSIN, IA_SIN, and in_addr::s_addr.

Referenced by arprequest(), and arpresolve_full().

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◆ arpresolve()

int arpresolve	(	struct ifnet *	ifp,
		int	is_gw,
		struct mbuf *	m,
		const struct sockaddr *	dst,
		u_char *	desten,
		uint32_t *	pflags,
		struct llentry **	plle
	)

Definition at line 614 of file if_ether.c.

References arpresolve_full(), ETHER_MAP_IP_MULTICAST, LLTABLE, and SIN.

Referenced by toe_l2_resolve().

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◆ arpresolve_full()

static int arpresolve_full	(	struct ifnet *	ifp,
		int	is_gw,
		int	flags,
		struct mbuf *	m,
		const struct sockaddr *	dst,
		u_char *	desten,
		uint32_t *	pflags,
		struct llentry **	plle
	)

static

Definition at line 462 of file if_ether.c.

References arprequest_internal(), arptimer(), inet_ntoa_r(), LLTABLE, next, SIN, V_arp_maxhold, V_arp_maxtries, and V_arpt_down.

Referenced by arpresolve().

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◆ arptimer()

static void arptimer ( void * arg )

static

Definition at line 205 of file if_ether.c.

References ARP_LLINFO_DELETED, ARP_LLINFO_INCOMPLETE, ARP_LLINFO_REACHABLE, ARP_LLINFO_VERIFY, arprequest(), and V_arpt_rexmit.

Referenced by arp_mark_lle_reachable(), and arpresolve_full().

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◆ garp_rexmit()

static void garp_rexmit ( void * arg )

static

Definition at line 1360 of file if_ether.c.

References arprequest(), garp_rexmit(), garp_rexmit_count, in_ifaddr::ia_garp_count, in_ifaddr::ia_garp_timer, in_ifaddr::ia_ifa, and IA_SIN.

Referenced by garp_rexmit(), and garp_timer_start().

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◆ garp_timer_start()

static void garp_timer_start ( struct ifaddr * ifa )

static

Definition at line 1423 of file if_ether.c.

References garp_rexmit(), in_ifaddr::ia_garp_count, in_ifaddr::ia_garp_timer, and in_ifaddr::ia_ifa.

Referenced by arp_ifinit().

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◆ SYSCTL_DECL()

SYSCTL_DECL ( _net_link_ether )

◆ sysctl_garp_rexmit()

static int sysctl_garp_rexmit ( SYSCTL_HANDLER_ARGS )

static

Definition at line 1334 of file if_ether.c.

References MAX_GARP_RETRANSMITS.

◆ SYSCTL_INT() [1/7]

SYSCTL_INT	(	_net_link_ether_arp	,
		OID_AUTO	,
		log_level	,
		CTLFLAG_VNET\|	CTLFLAG_RW,
		&	VNET_NAMEarp_log_level,
		0	,
		"Minimum log(9) level for recording rate limited arp log messages. " "The higher will be log more (emerg=0, info=6 (default), debug=7)."
	)

◆ SYSCTL_INT() [2/7]

SYSCTL_INT	(	_net_link_ether_inet	,
		OID_AUTO	,
		max_age	,
		CTLFLAG_VNET\|	CTLFLAG_RW,
		&	VNET_NAMEarpt_keep,
		0	,
		"ARP entry lifetime in seconds"
	)

◆ SYSCTL_INT() [3/7]

SYSCTL_INT	(	_net_link_ether_inet	,
		OID_AUTO	,
		max_log_per_second	,
		CTLFLAG_RW	,
		&	arp_maxpps,
		0	,
		"Maximum number of remotely triggered ARP messages that can be " "logged per second"
	)

◆ SYSCTL_INT() [4/7]

SYSCTL_INT	(	_net_link_ether_inet	,
		OID_AUTO	,
		maxhold	,
		CTLFLAG_VNET\|	CTLFLAG_RW,
		&	VNET_NAMEarp_maxhold,
		0	,
		"Number of packets to hold per ARP entry"
	)

◆ SYSCTL_INT() [5/7]

SYSCTL_INT	(	_net_link_ether_inet	,
		OID_AUTO	,
		maxtries	,
		CTLFLAG_VNET\|	CTLFLAG_RW,
		&	VNET_NAMEarp_maxtries,
		0	,
		"ARP resolution attempts before returning error"
	)

◆ SYSCTL_INT() [6/7]

SYSCTL_INT	(	_net_link_ether_inet	,
		OID_AUTO	,
		proxyall	,
		CTLFLAG_VNET\|	CTLFLAG_RW,
		&	VNET_NAMEarp_proxyall,
		0	,
		"Enable proxy ARP for all suitable requests"
	)

◆ SYSCTL_INT() [7/7]

SYSCTL_INT	(	_net_link_ether_inet	,
		OID_AUTO	,
		wait	,
		CTLFLAG_VNET\|	CTLFLAG_RW,
		&	VNET_NAMEarpt_down,
		0	,
		"Incomplete ARP entry lifetime in seconds"
	)

◆ SYSCTL_NODE() [1/2]

static SYSCTL_NODE	(	_net_link_ether	,
		PF_ARP	,
		arp	,
		CTLFLAG_RW\|	CTLFLAG_MPSAFE,
		0	,
		""
	)

static

◆ SYSCTL_NODE() [2/2]

static SYSCTL_NODE	(	_net_link_ether	,
		PF_INET	,
		inet	,
		CTLFLAG_RW\|	CTLFLAG_MPSAFE,
		0	,
		""
	)

static

◆ SYSCTL_PROC()

SYSCTL_PROC	(	_net_link_ether_inet	,
		OID_AUTO	,
		garp_rexmit_count	,
		CTLTYPE_INT\|CTLFLAG_RW\|	CTLFLAG_MPSAFE,
		&	garp_rexmit_count,
		0	,
		sysctl_garp_rexmit	,
		"I"	,
		"Number of times to retransmit GARP packets;" " 0 to	disable,
		maximum of 16"
	)

◆ SYSCTL_VNET_PCPUSTAT()

SYSCTL_VNET_PCPUSTAT	(	_net_link_ether_arp	,
		OID_AUTO	,
		stats	,
		struct arpstat	,
		arpstat	,
		"ARP statistics (struct arpstat, net/if_arp.h)"
	)

◆ vnet_arp_init()

static void vnet_arp_init ( void )

static

Definition at line 1502 of file if_ether.c.

References arp_iflladdr(), arp_nh, and iflladdr_tag.

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◆ VNET_DEFINE_STATIC() [1/7]

VNET_DEFINE_STATIC	(	int	,
		arp_log_level
	)

◆ VNET_DEFINE_STATIC() [2/7]

VNET_DEFINE_STATIC	(	int	,
		arp_maxhold
	)

◆ VNET_DEFINE_STATIC() [3/7]

VNET_DEFINE_STATIC	(	int	,
		arp_maxtries
	)

◆ VNET_DEFINE_STATIC() [4/7]

VNET_DEFINE_STATIC	(	int	,
		arp_proxyall
	)

pure virtual

◆ VNET_DEFINE_STATIC() [5/7]

VNET_DEFINE_STATIC	(	int	,
		arpt_down
	)

◆ VNET_DEFINE_STATIC() [6/7]

VNET_DEFINE_STATIC	(	int	,
		arpt_keep
	)

◆ VNET_DEFINE_STATIC() [7/7]

VNET_DEFINE_STATIC	(	int	,
		arpt_rexmit
	)

◆ VNET_PCPUSTAT_DEFINE()

VNET_PCPUSTAT_DEFINE	(	struct arpstat	,
		arpstat
	)

◆ VNET_PCPUSTAT_SYSINIT()

VNET_PCPUSTAT_SYSINIT ( arpstat )

◆ VNET_SYSINIT()

VNET_SYSINIT	(	vnet_arp_init	,
		SI_SUB_PROTO_DOMAIN	,
		SI_ORDER_SECOND	,
		vnet_arp_init	,
		0
	)

Variable Documentation

◆ arp_curpps

int arp_curpps

static

Definition at line 82 of file if_ether.c.

◆ arp_lastlog

struct timeval arp_lastlog

static

Definition at line 81 of file if_ether.c.

◆ arp_maxpps

int arp_maxpps = 1

static

Definition at line 83 of file if_ether.c.

◆ arp_nh

const struct netisr_handler arp_nh

static

Initial value:

= {
        .nh_name = "arp",
        .nh_handler = arpintr,
        .nh_proto = NETISR_ARP,
        .nh_policy = NETISR_POLICY_SOURCE,
}

Definition at line 194 of file if_ether.c.

Referenced by vnet_arp_init().

◆ garp_rexmit_count

int garp_rexmit_count = 0

static

Definition at line 161 of file if_ether.c.

Referenced by arp_ifinit(), and garp_rexmit().

◆ iflladdr_tag

eventhandler_tag iflladdr_tag

static

Definition at line 192 of file if_ether.c.

Referenced by vnet_arp_init().

Macros

Enumerations

Functions

Variables

Macro Definition Documentation

◆ ARP_LOG

◆ MAX_GARP_RETRANSMITS

◆ SIN

◆ V_arp_log_level

◆ V_arp_maxhold

◆ V_arp_maxtries

◆ V_arp_proxyall

◆ V_arpt_down

◆ V_arpt_keep

◆ V_arpt_rexmit

Enumeration Type Documentation

◆ arp_llinfo_state

Function Documentation

◆ __FBSDID()

◆ arp_add_ifa_lle()

◆ arp_announce_ifaddr()

◆ arp_check_update_lle()

◆ arp_fillheader()

◆ arp_flush_holdchain()

◆ arp_grab_holdchain()

◆ arp_handle_ifllchange()

◆ arp_ifinit()

◆ arp_iflladdr()

◆ arp_mark_lle_reachable()

◆ arpintr()

◆ arprequest()

◆ arprequest_internal()

◆ arpresolve()

◆ arpresolve_full()

◆ arptimer()

◆ garp_rexmit()

◆ garp_timer_start()

◆ SYSCTL_DECL()

◆ sysctl_garp_rexmit()

◆ SYSCTL_INT() [1/7]

◆ SYSCTL_INT() [2/7]

◆ SYSCTL_INT() [3/7]

◆ SYSCTL_INT() [4/7]

◆ SYSCTL_INT() [5/7]

◆ SYSCTL_INT() [6/7]

◆ SYSCTL_INT() [7/7]

◆ SYSCTL_NODE() [1/2]

◆ SYSCTL_NODE() [2/2]

◆ SYSCTL_PROC()

◆ SYSCTL_VNET_PCPUSTAT()

◆ vnet_arp_init()

◆ VNET_DEFINE_STATIC() [1/7]

◆ VNET_DEFINE_STATIC() [2/7]

◆ VNET_DEFINE_STATIC() [3/7]

◆ VNET_DEFINE_STATIC() [4/7]

◆ VNET_DEFINE_STATIC() [5/7]

◆ VNET_DEFINE_STATIC() [6/7]

◆ VNET_DEFINE_STATIC() [7/7]

◆ VNET_PCPUSTAT_DEFINE()

◆ VNET_PCPUSTAT_SYSINIT()

◆ VNET_SYSINIT()

Variable Documentation

◆ arp_curpps

◆ arp_lastlog

◆ arp_maxpps

◆ arp_nh

◆ garp_rexmit_count

◆ iflladdr_tag