1 #ifndef __LINUX_RTNETLINK_H
2 #define __LINUX_RTNETLINK_H
4 #include <linux/types.h>
5 #include <linux/netlink.h>
6 #include <linux/if_link.h>
7 #include <linux/if_addr.h>
8 #include <linux/neighbour.h>
10 /* rtnetlink families. Values up to 127 are reserved for real address
11 * families, values above 128 may be used arbitrarily.
13 #define RTNL_FAMILY_IPMR 128
14 #define RTNL_FAMILY_IP6MR 129
15 #define RTNL_FAMILY_MAX 129
18 * Routing/neighbour discovery messages.
21 /* Types of messages */
25 #define RTM_BASE RTM_BASE
28 #define RTM_NEWLINK RTM_NEWLINK
30 #define RTM_DELLINK RTM_DELLINK
32 #define RTM_GETLINK RTM_GETLINK
34 #define RTM_SETLINK RTM_SETLINK
37 #define RTM_NEWADDR RTM_NEWADDR
39 #define RTM_DELADDR RTM_DELADDR
41 #define RTM_GETADDR RTM_GETADDR
44 #define RTM_NEWROUTE RTM_NEWROUTE
46 #define RTM_DELROUTE RTM_DELROUTE
48 #define RTM_GETROUTE RTM_GETROUTE
51 #define RTM_NEWNEIGH RTM_NEWNEIGH
53 #define RTM_DELNEIGH RTM_DELNEIGH
55 #define RTM_GETNEIGH RTM_GETNEIGH
58 #define RTM_NEWRULE RTM_NEWRULE
60 #define RTM_DELRULE RTM_DELRULE
62 #define RTM_GETRULE RTM_GETRULE
65 #define RTM_NEWQDISC RTM_NEWQDISC
67 #define RTM_DELQDISC RTM_DELQDISC
69 #define RTM_GETQDISC RTM_GETQDISC
72 #define RTM_NEWTCLASS RTM_NEWTCLASS
74 #define RTM_DELTCLASS RTM_DELTCLASS
76 #define RTM_GETTCLASS RTM_GETTCLASS
79 #define RTM_NEWTFILTER RTM_NEWTFILTER
81 #define RTM_DELTFILTER RTM_DELTFILTER
83 #define RTM_GETTFILTER RTM_GETTFILTER
86 #define RTM_NEWACTION RTM_NEWACTION
88 #define RTM_DELACTION RTM_DELACTION
90 #define RTM_GETACTION RTM_GETACTION
93 #define RTM_NEWPREFIX RTM_NEWPREFIX
95 RTM_GETMULTICAST
= 58,
96 #define RTM_GETMULTICAST RTM_GETMULTICAST
99 #define RTM_GETANYCAST RTM_GETANYCAST
101 RTM_NEWNEIGHTBL
= 64,
102 #define RTM_NEWNEIGHTBL RTM_NEWNEIGHTBL
103 RTM_GETNEIGHTBL
= 66,
104 #define RTM_GETNEIGHTBL RTM_GETNEIGHTBL
106 #define RTM_SETNEIGHTBL RTM_SETNEIGHTBL
108 RTM_NEWNDUSEROPT
= 68,
109 #define RTM_NEWNDUSEROPT RTM_NEWNDUSEROPT
111 RTM_NEWADDRLABEL
= 72,
112 #define RTM_NEWADDRLABEL RTM_NEWADDRLABEL
114 #define RTM_DELADDRLABEL RTM_DELADDRLABEL
116 #define RTM_GETADDRLABEL RTM_GETADDRLABEL
119 #define RTM_GETDCB RTM_GETDCB
121 #define RTM_SETDCB RTM_SETDCB
124 #define RTM_MAX (((__RTM_MAX + 3) & ~3) - 1)
127 #define RTM_NR_MSGTYPES (RTM_MAX + 1 - RTM_BASE)
128 #define RTM_NR_FAMILIES (RTM_NR_MSGTYPES >> 2)
129 #define RTM_FAM(cmd) (((cmd) - RTM_BASE) >> 2)
132 Generic structure for encapsulation of optional route information.
133 It is reminiscent of sockaddr, but with sa_family replaced
138 unsigned short rta_len
;
139 unsigned short rta_type
;
142 /* Macros to handle rtattributes */
144 #define RTA_ALIGNTO 4
145 #define RTA_ALIGN(len) ( ((len)+RTA_ALIGNTO-1) & ~(RTA_ALIGNTO-1) )
146 #define RTA_OK(rta,len) ((len) >= (int)sizeof(struct rtattr) && \
147 (rta)->rta_len >= sizeof(struct rtattr) && \
148 (rta)->rta_len <= (len))
149 #define RTA_NEXT(rta,attrlen) ((attrlen) -= RTA_ALIGN((rta)->rta_len), \
150 (struct rtattr*)(((char*)(rta)) + RTA_ALIGN((rta)->rta_len)))
151 #define RTA_LENGTH(len) (RTA_ALIGN(sizeof(struct rtattr)) + (len))
152 #define RTA_SPACE(len) RTA_ALIGN(RTA_LENGTH(len))
153 #define RTA_DATA(rta) ((void*)(((char*)(rta)) + RTA_LENGTH(0)))
154 #define RTA_PAYLOAD(rta) ((int)((rta)->rta_len) - RTA_LENGTH(0))
159 /******************************************************************************
160 * Definitions used in routing table administration.
164 unsigned char rtm_family
;
165 unsigned char rtm_dst_len
;
166 unsigned char rtm_src_len
;
167 unsigned char rtm_tos
;
169 unsigned char rtm_table
; /* Routing table id */
170 unsigned char rtm_protocol
; /* Routing protocol; see below */
171 unsigned char rtm_scope
; /* See below */
172 unsigned char rtm_type
; /* See below */
181 RTN_UNICAST
, /* Gateway or direct route */
182 RTN_LOCAL
, /* Accept locally */
183 RTN_BROADCAST
, /* Accept locally as broadcast,
185 RTN_ANYCAST
, /* Accept locally as broadcast,
186 but send as unicast */
187 RTN_MULTICAST
, /* Multicast route */
188 RTN_BLACKHOLE
, /* Drop */
189 RTN_UNREACHABLE
, /* Destination is unreachable */
190 RTN_PROHIBIT
, /* Administratively prohibited */
191 RTN_THROW
, /* Not in this table */
192 RTN_NAT
, /* Translate this address */
193 RTN_XRESOLVE
, /* Use external resolver */
197 #define RTN_MAX (__RTN_MAX - 1)
202 #define RTPROT_UNSPEC 0
203 #define RTPROT_REDIRECT 1 /* Route installed by ICMP redirects;
204 not used by current IPv4 */
205 #define RTPROT_KERNEL 2 /* Route installed by kernel */
206 #define RTPROT_BOOT 3 /* Route installed during boot */
207 #define RTPROT_STATIC 4 /* Route installed by administrator */
209 /* Values of protocol >= RTPROT_STATIC are not interpreted by kernel;
210 they are just passed from user and back as is.
211 It will be used by hypothetical multiple routing daemons.
212 Note that protocol values should be standardized in order to
216 #define RTPROT_GATED 8 /* Apparently, GateD */
217 #define RTPROT_RA 9 /* RDISC/ND router advertisements */
218 #define RTPROT_MRT 10 /* Merit MRT */
219 #define RTPROT_ZEBRA 11 /* Zebra */
220 #define RTPROT_BIRD 12 /* BIRD */
221 #define RTPROT_DNROUTED 13 /* DECnet routing daemon */
222 #define RTPROT_XORP 14 /* XORP */
223 #define RTPROT_NTK 15 /* Netsukuku */
224 #define RTPROT_DHCP 16 /* DHCP client */
228 Really it is not scope, but sort of distance to the destination.
229 NOWHERE are reserved for not existing destinations, HOST is our
230 local addresses, LINK are destinations, located on directly attached
231 link and UNIVERSE is everywhere in the Universe.
233 Intermediate values are also possible f.e. interior routes
234 could be assigned a value between UNIVERSE and LINK.
239 /* User defined values */
248 #define RTM_F_NOTIFY 0x100 /* Notify user of route change */
249 #define RTM_F_CLONED 0x200 /* This route is cloned */
250 #define RTM_F_EQUALIZE 0x400 /* Multipath equalizer: NI */
251 #define RTM_F_PREFIX 0x800 /* Prefix addresses */
253 /* Reserved table identifiers */
257 /* User defined values */
259 RT_TABLE_DEFAULT
=253,
262 RT_TABLE_MAX
=0xFFFFFFFF
266 /* Routing message attributes */
279 RTA_PROTOINFO
, /* no longer used */
282 RTA_SESSION
, /* no longer used */
283 RTA_MP_ALGO
, /* no longer used */
289 #define RTA_MAX (__RTA_MAX - 1)
291 #define RTM_RTA(r) ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct rtmsg))))
292 #define RTM_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct rtmsg))
294 /* RTM_MULTIPATH --- array of struct rtnexthop.
296 * "struct rtnexthop" describes all necessary nexthop information,
297 * i.e. parameters of path to a destination via this nexthop.
299 * At the moment it is impossible to set different prefsrc, mtu, window
300 * and rtt for different paths from multipath.
304 unsigned short rtnh_len
;
305 unsigned char rtnh_flags
;
306 unsigned char rtnh_hops
;
312 #define RTNH_F_DEAD 1 /* Nexthop is dead (used by multipath) */
313 #define RTNH_F_PERVASIVE 2 /* Do recursive gateway lookup */
314 #define RTNH_F_ONLINK 4 /* Gateway is forced on link */
316 /* Macros to handle hexthops */
318 #define RTNH_ALIGNTO 4
319 #define RTNH_ALIGN(len) ( ((len)+RTNH_ALIGNTO-1) & ~(RTNH_ALIGNTO-1) )
320 #define RTNH_OK(rtnh,len) ((rtnh)->rtnh_len >= sizeof(struct rtnexthop) && \
321 ((int)(rtnh)->rtnh_len) <= (len))
322 #define RTNH_NEXT(rtnh) ((struct rtnexthop*)(((char*)(rtnh)) + RTNH_ALIGN((rtnh)->rtnh_len)))
323 #define RTNH_LENGTH(len) (RTNH_ALIGN(sizeof(struct rtnexthop)) + (len))
324 #define RTNH_SPACE(len) RTNH_ALIGN(RTNH_LENGTH(len))
325 #define RTNH_DATA(rtnh) ((struct rtattr*)(((char*)(rtnh)) + RTNH_LENGTH(0)))
329 struct rta_cacheinfo
{
336 #define RTNETLINK_HAVE_PEERINFO 1
342 /* RTM_METRICS --- array of struct rtattr with types of RTAX_* */
346 #define RTAX_UNSPEC RTAX_UNSPEC
348 #define RTAX_LOCK RTAX_LOCK
350 #define RTAX_MTU RTAX_MTU
352 #define RTAX_WINDOW RTAX_WINDOW
354 #define RTAX_RTT RTAX_RTT
356 #define RTAX_RTTVAR RTAX_RTTVAR
358 #define RTAX_SSTHRESH RTAX_SSTHRESH
360 #define RTAX_CWND RTAX_CWND
362 #define RTAX_ADVMSS RTAX_ADVMSS
364 #define RTAX_REORDERING RTAX_REORDERING
366 #define RTAX_HOPLIMIT RTAX_HOPLIMIT
368 #define RTAX_INITCWND RTAX_INITCWND
370 #define RTAX_FEATURES RTAX_FEATURES
372 #define RTAX_RTO_MIN RTAX_RTO_MIN
374 #define RTAX_INITRWND RTAX_INITRWND
378 #define RTAX_MAX (__RTAX_MAX - 1)
380 #define RTAX_FEATURE_ECN 0x00000001
381 #define RTAX_FEATURE_SACK 0x00000002
382 #define RTAX_FEATURE_TIMESTAMP 0x00000004
383 #define RTAX_FEATURE_ALLFRAG 0x00000008
407 * General form of address family dependent message.
411 unsigned char rtgen_family
;
414 /*****************************************************************
415 * Link layer specific messages.
419 * passes link level specific information, not dependent
420 * on network protocol.
424 unsigned char ifi_family
;
425 unsigned char __ifi_pad
;
426 unsigned short ifi_type
; /* ARPHRD_* */
427 int ifi_index
; /* Link index */
428 unsigned ifi_flags
; /* IFF_* flags */
429 unsigned ifi_change
; /* IFF_* change mask */
432 /********************************************************************
437 unsigned char prefix_family
;
438 unsigned char prefix_pad1
;
439 unsigned short prefix_pad2
;
441 unsigned char prefix_type
;
442 unsigned char prefix_len
;
443 unsigned char prefix_flags
;
444 unsigned char prefix_pad3
;
455 #define PREFIX_MAX (__PREFIX_MAX - 1)
457 struct prefix_cacheinfo
{
458 __u32 preferred_time
;
463 /*****************************************************************
464 * Traffic control messages.
468 unsigned char tcm_family
;
469 unsigned char tcm__pad1
;
470 unsigned short tcm__pad2
;
490 #define TCA_MAX (__TCA_MAX - 1)
492 #define TCA_RTA(r) ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct tcmsg))))
493 #define TCA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct tcmsg))
495 /********************************************************************
496 * Neighbor Discovery userland options
499 struct nduseroptmsg
{
500 unsigned char nduseropt_family
;
501 unsigned char nduseropt_pad1
;
502 unsigned short nduseropt_opts_len
; /* Total length of options */
503 int nduseropt_ifindex
;
504 __u8 nduseropt_icmp_type
;
505 __u8 nduseropt_icmp_code
;
506 unsigned short nduseropt_pad2
;
507 unsigned int nduseropt_pad3
;
508 /* Followed by one or more ND options */
517 #define NDUSEROPT_MAX (__NDUSEROPT_MAX - 1)
520 /* RTnetlink multicast groups - backwards compatibility for userspace */
521 #define RTMGRP_LINK 1
522 #define RTMGRP_NOTIFY 2
523 #define RTMGRP_NEIGH 4
526 #define RTMGRP_IPV4_IFADDR 0x10
527 #define RTMGRP_IPV4_MROUTE 0x20
528 #define RTMGRP_IPV4_ROUTE 0x40
529 #define RTMGRP_IPV4_RULE 0x80
531 #define RTMGRP_IPV6_IFADDR 0x100
532 #define RTMGRP_IPV6_MROUTE 0x200
533 #define RTMGRP_IPV6_ROUTE 0x400
534 #define RTMGRP_IPV6_IFINFO 0x800
536 #define RTMGRP_DECnet_IFADDR 0x1000
537 #define RTMGRP_DECnet_ROUTE 0x4000
539 #define RTMGRP_IPV6_PREFIX 0x20000
542 /* RTnetlink multicast groups */
543 enum rtnetlink_groups
{
545 #define RTNLGRP_NONE RTNLGRP_NONE
547 #define RTNLGRP_LINK RTNLGRP_LINK
549 #define RTNLGRP_NOTIFY RTNLGRP_NOTIFY
551 #define RTNLGRP_NEIGH RTNLGRP_NEIGH
553 #define RTNLGRP_TC RTNLGRP_TC
555 #define RTNLGRP_IPV4_IFADDR RTNLGRP_IPV4_IFADDR
557 #define RTNLGRP_IPV4_MROUTE RTNLGRP_IPV4_MROUTE
559 #define RTNLGRP_IPV4_ROUTE RTNLGRP_IPV4_ROUTE
561 #define RTNLGRP_IPV4_RULE RTNLGRP_IPV4_RULE
563 #define RTNLGRP_IPV6_IFADDR RTNLGRP_IPV6_IFADDR
565 #define RTNLGRP_IPV6_MROUTE RTNLGRP_IPV6_MROUTE
567 #define RTNLGRP_IPV6_ROUTE RTNLGRP_IPV6_ROUTE
569 #define RTNLGRP_IPV6_IFINFO RTNLGRP_IPV6_IFINFO
570 RTNLGRP_DECnet_IFADDR
,
571 #define RTNLGRP_DECnet_IFADDR RTNLGRP_DECnet_IFADDR
573 RTNLGRP_DECnet_ROUTE
,
574 #define RTNLGRP_DECnet_ROUTE RTNLGRP_DECnet_ROUTE
576 #define RTNLGRP_DECnet_RULE RTNLGRP_DECnet_RULE
579 #define RTNLGRP_IPV6_PREFIX RTNLGRP_IPV6_PREFIX
581 #define RTNLGRP_IPV6_RULE RTNLGRP_IPV6_RULE
583 #define RTNLGRP_ND_USEROPT RTNLGRP_ND_USEROPT
584 RTNLGRP_PHONET_IFADDR
,
585 #define RTNLGRP_PHONET_IFADDR RTNLGRP_PHONET_IFADDR
586 RTNLGRP_PHONET_ROUTE
,
587 #define RTNLGRP_PHONET_ROUTE RTNLGRP_PHONET_ROUTE
589 #define RTNLGRP_DCB RTNLGRP_DCB
592 #define RTNLGRP_MAX (__RTNLGRP_MAX - 1)
594 /* TC action piece */
596 unsigned char tca_family
;
597 unsigned char tca__pad1
;
598 unsigned short tca__pad2
;
600 #define TA_RTA(r) ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct tcamsg))))
601 #define TA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct tcamsg))
602 #define TCA_ACT_TAB 1 /* attr type must be >=1 */
605 /* End of information exported to user level */
609 #include <linux/mutex.h>
610 #include <linux/netdevice.h>
612 static __inline__
int rtattr_strcmp(const struct rtattr
*rta
, const char *str
)
614 int len
= strlen(str
) + 1;
615 return len
> rta
->rta_len
|| memcmp(RTA_DATA(rta
), str
, len
);
618 extern int rtnetlink_send(struct sk_buff
*skb
, struct net
*net
, u32 pid
, u32 group
, int echo
);
619 extern int rtnl_unicast(struct sk_buff
*skb
, struct net
*net
, u32 pid
);
620 extern void rtnl_notify(struct sk_buff
*skb
, struct net
*net
, u32 pid
,
621 u32 group
, struct nlmsghdr
*nlh
, gfp_t flags
);
622 extern void rtnl_set_sk_err(struct net
*net
, u32 group
, int error
);
623 extern int rtnetlink_put_metrics(struct sk_buff
*skb
, u32
*metrics
);
624 extern int rtnl_put_cacheinfo(struct sk_buff
*skb
, struct dst_entry
*dst
,
625 u32 id
, u32 ts
, u32 tsage
, long expires
,
628 extern void __rta_fill(struct sk_buff
*skb
, int attrtype
, int attrlen
, const void *data
);
630 #define RTA_PUT(skb, attrtype, attrlen, data) \
631 ({ if (unlikely(skb_tailroom(skb) < (int)RTA_SPACE(attrlen))) \
632 goto rtattr_failure; \
633 __rta_fill(skb, attrtype, attrlen, data); })
635 #define RTA_APPEND(skb, attrlen, data) \
636 ({ if (unlikely(skb_tailroom(skb) < (int)(attrlen))) \
637 goto rtattr_failure; \
638 memcpy(skb_put(skb, attrlen), data, attrlen); })
640 #define RTA_PUT_NOHDR(skb, attrlen, data) \
641 ({ RTA_APPEND(skb, RTA_ALIGN(attrlen), data); \
642 memset(skb_tail_pointer(skb) - (RTA_ALIGN(attrlen) - attrlen), 0, \
643 RTA_ALIGN(attrlen) - attrlen); })
645 #define RTA_PUT_U8(skb, attrtype, value) \
646 ({ u8 _tmp = (value); \
647 RTA_PUT(skb, attrtype, sizeof(u8), &_tmp); })
649 #define RTA_PUT_U16(skb, attrtype, value) \
650 ({ u16 _tmp = (value); \
651 RTA_PUT(skb, attrtype, sizeof(u16), &_tmp); })
653 #define RTA_PUT_U32(skb, attrtype, value) \
654 ({ u32 _tmp = (value); \
655 RTA_PUT(skb, attrtype, sizeof(u32), &_tmp); })
657 #define RTA_PUT_U64(skb, attrtype, value) \
658 ({ u64 _tmp = (value); \
659 RTA_PUT(skb, attrtype, sizeof(u64), &_tmp); })
661 #define RTA_PUT_SECS(skb, attrtype, value) \
662 RTA_PUT_U64(skb, attrtype, (value) / HZ)
664 #define RTA_PUT_MSECS(skb, attrtype, value) \
665 RTA_PUT_U64(skb, attrtype, jiffies_to_msecs(value))
667 #define RTA_PUT_STRING(skb, attrtype, value) \
668 RTA_PUT(skb, attrtype, strlen(value) + 1, value)
670 #define RTA_PUT_FLAG(skb, attrtype) \
671 RTA_PUT(skb, attrtype, 0, NULL);
673 #define RTA_NEST(skb, type) \
674 ({ struct rtattr *__start = (struct rtattr *)skb_tail_pointer(skb); \
675 RTA_PUT(skb, type, 0, NULL); \
678 #define RTA_NEST_END(skb, start) \
679 ({ (start)->rta_len = skb_tail_pointer(skb) - (unsigned char *)(start); \
682 #define RTA_NEST_COMPAT(skb, type, attrlen, data) \
683 ({ struct rtattr *__start = (struct rtattr *)skb_tail_pointer(skb); \
684 RTA_PUT(skb, type, attrlen, data); \
685 RTA_NEST(skb, type); \
688 #define RTA_NEST_COMPAT_END(skb, start) \
689 ({ struct rtattr *__nest = (void *)(start) + NLMSG_ALIGN((start)->rta_len); \
690 (start)->rta_len = skb_tail_pointer(skb) - (unsigned char *)(start); \
691 RTA_NEST_END(skb, __nest); \
694 #define RTA_NEST_CANCEL(skb, start) \
696 skb_trim(skb, (unsigned char *) (start) - (skb)->data); \
699 #define RTA_GET_U8(rta) \
700 ({ if (!rta || RTA_PAYLOAD(rta) < sizeof(u8)) \
701 goto rtattr_failure; \
702 *(u8 *) RTA_DATA(rta); })
704 #define RTA_GET_U16(rta) \
705 ({ if (!rta || RTA_PAYLOAD(rta) < sizeof(u16)) \
706 goto rtattr_failure; \
707 *(u16 *) RTA_DATA(rta); })
709 #define RTA_GET_U32(rta) \
710 ({ if (!rta || RTA_PAYLOAD(rta) < sizeof(u32)) \
711 goto rtattr_failure; \
712 *(u32 *) RTA_DATA(rta); })
714 #define RTA_GET_U64(rta) \
716 if (!rta || RTA_PAYLOAD(rta) < sizeof(u64)) \
717 goto rtattr_failure; \
718 memcpy(&_tmp, RTA_DATA(rta), sizeof(_tmp)); \
721 #define RTA_GET_FLAG(rta) (!!(rta))
723 #define RTA_GET_SECS(rta) ((unsigned long) RTA_GET_U64(rta) * HZ)
724 #define RTA_GET_MSECS(rta) (msecs_to_jiffies((unsigned long) RTA_GET_U64(rta)))
726 static inline struct rtattr
*
727 __rta_reserve(struct sk_buff
*skb
, int attrtype
, int attrlen
)
730 int size
= RTA_LENGTH(attrlen
);
732 rta
= (struct rtattr
*)skb_put(skb
, RTA_ALIGN(size
));
733 rta
->rta_type
= attrtype
;
735 memset(RTA_DATA(rta
) + attrlen
, 0, RTA_ALIGN(size
) - size
);
739 #define __RTA_PUT(skb, attrtype, attrlen) \
740 ({ if (unlikely(skb_tailroom(skb) < (int)RTA_SPACE(attrlen))) \
741 goto rtattr_failure; \
742 __rta_reserve(skb, attrtype, attrlen); })
744 extern void rtmsg_ifinfo(int type
, struct net_device
*dev
, unsigned change
);
746 /* RTNL is used as a global lock for all changes to network configuration */
747 extern void rtnl_lock(void);
748 extern void rtnl_unlock(void);
749 extern int rtnl_trylock(void);
750 extern int rtnl_is_locked(void);
751 #ifdef CONFIG_PROVE_LOCKING
752 extern int lockdep_rtnl_is_held(void);
753 #endif /* #ifdef CONFIG_PROVE_LOCKING */
756 * rcu_dereference_rtnl - rcu_dereference with debug checking
757 * @p: The pointer to read, prior to dereferencing
759 * Do an rcu_dereference(p), but check caller either holds rcu_read_lock()
760 * or RTNL. Note : Please prefer rtnl_dereference() or rcu_dereference()
762 #define rcu_dereference_rtnl(p) \
763 rcu_dereference_check(p, lockdep_rtnl_is_held())
766 * rtnl_dereference - fetch RCU pointer when updates are prevented by RTNL
767 * @p: The pointer to read, prior to dereferencing
769 * Return the value of the specified RCU-protected pointer, but omit
770 * both the smp_read_barrier_depends() and the ACCESS_ONCE(), because
773 #define rtnl_dereference(p) \
774 rcu_dereference_protected(p, lockdep_rtnl_is_held())
776 static inline struct netdev_queue
*dev_ingress_queue(struct net_device
*dev
)
778 return rtnl_dereference(dev
->ingress_queue
);
781 extern struct netdev_queue
*dev_ingress_queue_create(struct net_device
*dev
);
783 extern void rtnetlink_init(void);
784 extern void __rtnl_unlock(void);
786 #define ASSERT_RTNL() do { \
787 if (unlikely(!rtnl_is_locked())) { \
788 printk(KERN_ERR "RTNL: assertion failed at %s (%d)\n", \
789 __FILE__, __LINE__); \
794 static inline u32
rtm_get_table(struct rtattr
**rta
, u8 table
)
796 return RTA_GET_U32(rta
[RTA_TABLE
-1]);
801 #endif /* __KERNEL__ */
804 #endif /* __LINUX_RTNETLINK_H */
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