1 #ifndef __LINUX_RTNETLINK_H
2 #define __LINUX_RTNETLINK_H
4 #include <linux/netlink.h>
8 * Routing/neighbour discovery messages.
11 /* Types of messages */
15 #define RTM_BASE RTM_BASE
18 #define RTM_NEWLINK RTM_NEWLINK
20 #define RTM_DELLINK RTM_DELLINK
22 #define RTM_GETLINK RTM_GETLINK
24 #define RTM_SETLINK RTM_SETLINK
27 #define RTM_NEWADDR RTM_NEWADDR
29 #define RTM_DELADDR RTM_DELADDR
31 #define RTM_GETADDR RTM_GETADDR
34 #define RTM_NEWROUTE RTM_NEWROUTE
36 #define RTM_DELROUTE RTM_DELROUTE
38 #define RTM_GETROUTE RTM_GETROUTE
41 #define RTM_NEWNEIGH RTM_NEWNEIGH
43 #define RTM_DELNEIGH RTM_DELNEIGH
45 #define RTM_GETNEIGH RTM_GETNEIGH
48 #define RTM_NEWRULE RTM_NEWRULE
50 #define RTM_DELRULE RTM_DELRULE
52 #define RTM_GETRULE RTM_GETRULE
55 #define RTM_NEWQDISC RTM_NEWQDISC
57 #define RTM_DELQDISC RTM_DELQDISC
59 #define RTM_GETQDISC RTM_GETQDISC
62 #define RTM_NEWTCLASS RTM_NEWTCLASS
64 #define RTM_DELTCLASS RTM_DELTCLASS
66 #define RTM_GETTCLASS RTM_GETTCLASS
69 #define RTM_NEWTFILTER RTM_NEWTFILTER
71 #define RTM_DELTFILTER RTM_DELTFILTER
73 #define RTM_GETTFILTER RTM_GETTFILTER
76 #define RTM_NEWACTION RTM_NEWACTION
78 #define RTM_DELACTION RTM_DELACTION
80 #define RTM_GETACTION RTM_GETACTION
83 #define RTM_NEWPREFIX RTM_NEWPREFIX
85 #define RTM_GETPREFIX RTM_GETPREFIX
87 RTM_GETMULTICAST = 58,
88 #define RTM_GETMULTICAST RTM_GETMULTICAST
91 #define RTM_GETANYCAST RTM_GETANYCAST
94 #define RTM_NEWNEIGHTBL RTM_NEWNEIGHTBL
96 #define RTM_GETNEIGHTBL RTM_GETNEIGHTBL
98 #define RTM_SETNEIGHTBL RTM_SETNEIGHTBL
101 #define RTM_MAX (((__RTM_MAX + 3) & ~3) - 1)
104 #define RTM_NR_MSGTYPES (RTM_MAX + 1 - RTM_BASE)
105 #define RTM_NR_FAMILIES (RTM_NR_MSGTYPES >> 2)
106 #define RTM_FAM(cmd) (((cmd) - RTM_BASE) >> 2)
109 Generic structure for encapsulation of optional route information.
110 It is reminiscent of sockaddr, but with sa_family replaced
116 unsigned short rta_len;
117 unsigned short rta_type;
120 /* Macros to handle rtattributes */
122 #define RTA_ALIGNTO 4
123 #define RTA_ALIGN(len) ( ((len)+RTA_ALIGNTO-1) & ~(RTA_ALIGNTO-1) )
124 #define RTA_OK(rta,len) ((len) >= (int)sizeof(struct rtattr) && \
125 (rta)->rta_len >= sizeof(struct rtattr) && \
126 (rta)->rta_len <= (len))
127 #define RTA_NEXT(rta,attrlen) ((attrlen) -= RTA_ALIGN((rta)->rta_len), \
128 (struct rtattr*)(((char*)(rta)) + RTA_ALIGN((rta)->rta_len)))
129 #define RTA_LENGTH(len) (RTA_ALIGN(sizeof(struct rtattr)) + (len))
130 #define RTA_SPACE(len) RTA_ALIGN(RTA_LENGTH(len))
131 #define RTA_DATA(rta) ((void*)(((char*)(rta)) + RTA_LENGTH(0)))
132 #define RTA_PAYLOAD(rta) ((int)((rta)->rta_len) - RTA_LENGTH(0))
137 /******************************************************************************
138 * Definitions used in routing table administration.
143 unsigned char rtm_family;
144 unsigned char rtm_dst_len;
145 unsigned char rtm_src_len;
146 unsigned char rtm_tos;
148 unsigned char rtm_table; /* Routing table id */
149 unsigned char rtm_protocol; /* Routing protocol; see below */
150 unsigned char rtm_scope; /* See below */
151 unsigned char rtm_type; /* See below */
161 RTN_UNICAST, /* Gateway or direct route */
162 RTN_LOCAL, /* Accept locally */
163 RTN_BROADCAST, /* Accept locally as broadcast,
165 RTN_ANYCAST, /* Accept locally as broadcast,
166 but send as unicast */
167 RTN_MULTICAST, /* Multicast route */
168 RTN_BLACKHOLE, /* Drop */
169 RTN_UNREACHABLE, /* Destination is unreachable */
170 RTN_PROHIBIT, /* Administratively prohibited */
171 RTN_THROW, /* Not in this table */
172 RTN_NAT, /* Translate this address */
173 RTN_XRESOLVE, /* Use external resolver */
177 #define RTN_MAX (__RTN_MAX - 1)
182 #define RTPROT_UNSPEC 0
183 #define RTPROT_REDIRECT 1 /* Route installed by ICMP redirects;
184 not used by current IPv4 */
185 #define RTPROT_KERNEL 2 /* Route installed by kernel */
186 #define RTPROT_BOOT 3 /* Route installed during boot */
187 #define RTPROT_STATIC 4 /* Route installed by administrator */
189 /* Values of protocol >= RTPROT_STATIC are not interpreted by kernel;
190 they are just passed from user and back as is.
191 It will be used by hypothetical multiple routing daemons.
192 Note that protocol values should be standardized in order to
196 #define RTPROT_GATED 8 /* Apparently, GateD */
197 #define RTPROT_RA 9 /* RDISC/ND router advertisements */
198 #define RTPROT_MRT 10 /* Merit MRT */
199 #define RTPROT_ZEBRA 11 /* Zebra */
200 #define RTPROT_BIRD 12 /* BIRD */
201 #define RTPROT_DNROUTED 13 /* DECnet routing daemon */
202 #define RTPROT_XORP 14 /* XORP */
203 #define RTPROT_NTK 15 /* Netsukuku */
207 Really it is not scope, but sort of distance to the destination.
208 NOWHERE are reserved for not existing destinations, HOST is our
209 local addresses, LINK are destinations, located on directly attached
210 link and UNIVERSE is everywhere in the Universe.
212 Intermediate values are also possible f.e. interior routes
213 could be assigned a value between UNIVERSE and LINK.
219 /* User defined values */
228 #define RTM_F_NOTIFY 0x100 /* Notify user of route change */
229 #define RTM_F_CLONED 0x200 /* This route is cloned */
230 #define RTM_F_EQUALIZE 0x400 /* Multipath equalizer: NI */
231 #define RTM_F_PREFIX 0x800 /* Prefix addresses */
233 /* Reserved table identifiers */
238 /* User defined values */
239 RT_TABLE_DEFAULT=253,
244 #define RT_TABLE_MAX (__RT_TABLE_MAX - 1)
248 /* Routing message attributes */
270 #define RTA_MAX (__RTA_MAX - 1)
272 #define RTM_RTA(r) ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct rtmsg))))
273 #define RTM_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct rtmsg))
275 /* RTM_MULTIPATH --- array of struct rtnexthop.
277 * "struct rtnexthop" describes all necessary nexthop information,
278 * i.e. parameters of path to a destination via this nexthop.
280 * At the moment it is impossible to set different prefsrc, mtu, window
281 * and rtt for different paths from multipath.
286 unsigned short rtnh_len;
287 unsigned char rtnh_flags;
288 unsigned char rtnh_hops;
294 #define RTNH_F_DEAD 1 /* Nexthop is dead (used by multipath) */
295 #define RTNH_F_PERVASIVE 2 /* Do recursive gateway lookup */
296 #define RTNH_F_ONLINK 4 /* Gateway is forced on link */
298 /* Macros to handle hexthops */
300 #define RTNH_ALIGNTO 4
301 #define RTNH_ALIGN(len) ( ((len)+RTNH_ALIGNTO-1) & ~(RTNH_ALIGNTO-1) )
302 #define RTNH_OK(rtnh,len) ((rtnh)->rtnh_len >= sizeof(struct rtnexthop) && \
303 ((int)(rtnh)->rtnh_len) <= (len))
304 #define RTNH_NEXT(rtnh) ((struct rtnexthop*)(((char*)(rtnh)) + RTNH_ALIGN((rtnh)->rtnh_len)))
305 #define RTNH_LENGTH(len) (RTNH_ALIGN(sizeof(struct rtnexthop)) + (len))
306 #define RTNH_SPACE(len) RTNH_ALIGN(RTNH_LENGTH(len))
307 #define RTNH_DATA(rtnh) ((struct rtattr*)(((char*)(rtnh)) + RTNH_LENGTH(0)))
319 #define RTNETLINK_HAVE_PEERINFO 1
325 /* RTM_METRICS --- array of struct rtattr with types of RTAX_* */
330 #define RTAX_UNSPEC RTAX_UNSPEC
332 #define RTAX_LOCK RTAX_LOCK
334 #define RTAX_MTU RTAX_MTU
336 #define RTAX_WINDOW RTAX_WINDOW
338 #define RTAX_RTT RTAX_RTT
340 #define RTAX_RTTVAR RTAX_RTTVAR
342 #define RTAX_SSTHRESH RTAX_SSTHRESH
344 #define RTAX_CWND RTAX_CWND
346 #define RTAX_ADVMSS RTAX_ADVMSS
348 #define RTAX_REORDERING RTAX_REORDERING
350 #define RTAX_HOPLIMIT RTAX_HOPLIMIT
352 #define RTAX_INITCWND RTAX_INITCWND
354 #define RTAX_FEATURES RTAX_FEATURES
358 #define RTAX_MAX (__RTAX_MAX - 1)
360 #define RTAX_FEATURE_ECN 0x00000001
361 #define RTAX_FEATURE_SACK 0x00000002
362 #define RTAX_FEATURE_TIMESTAMP 0x00000004
363 #define RTAX_FEATURE_ALLFRAG 0x00000008
388 * General form of address family dependent message.
393 unsigned char rtgen_family;
396 /*****************************************************************
397 * Link layer specific messages.
401 * passes link level specific information, not dependent
402 * on network protocol.
407 unsigned char ifi_family;
408 unsigned char __ifi_pad;
409 unsigned short ifi_type; /* ARPHRD_* */
410 int ifi_index; /* Link index */
411 unsigned ifi_flags; /* IFF_* flags */
412 unsigned ifi_change; /* IFF_* change mask */
415 /********************************************************************
421 unsigned char prefix_family;
422 unsigned char prefix_pad1;
423 unsigned short prefix_pad2;
425 unsigned char prefix_type;
426 unsigned char prefix_len;
427 unsigned char prefix_flags;
428 unsigned char prefix_pad3;
439 #define PREFIX_MAX (__PREFIX_MAX - 1)
441 struct prefix_cacheinfo
443 __u32 preferred_time;
448 /*****************************************************************
449 * Traffic control messages.
454 unsigned char tcm_family;
455 unsigned char tcm__pad1;
456 unsigned short tcm__pad2;
476 #define TCA_MAX (__TCA_MAX - 1)
478 #define TCA_RTA(r) ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct tcmsg))))
479 #define TCA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct tcmsg))
482 /* RTnetlink multicast groups - backwards compatibility for userspace */
483 #define RTMGRP_LINK 1
484 #define RTMGRP_NOTIFY 2
485 #define RTMGRP_NEIGH 4
488 #define RTMGRP_IPV4_IFADDR 0x10
489 #define RTMGRP_IPV4_MROUTE 0x20
490 #define RTMGRP_IPV4_ROUTE 0x40
491 #define RTMGRP_IPV4_RULE 0x80
493 #define RTMGRP_IPV6_IFADDR 0x100
494 #define RTMGRP_IPV6_MROUTE 0x200
495 #define RTMGRP_IPV6_ROUTE 0x400
496 #define RTMGRP_IPV6_IFINFO 0x800
498 #define RTMGRP_DECnet_IFADDR 0x1000
499 #define RTMGRP_DECnet_ROUTE 0x4000
501 #define RTMGRP_IPV6_PREFIX 0x20000
504 /* RTnetlink multicast groups */
505 enum rtnetlink_groups {
507 #define RTNLGRP_NONE RTNLGRP_NONE
509 #define RTNLGRP_LINK RTNLGRP_LINK
511 #define RTNLGRP_NOTIFY RTNLGRP_NOTIFY
513 #define RTNLGRP_NEIGH RTNLGRP_NEIGH
515 #define RTNLGRP_TC RTNLGRP_TC
517 #define RTNLGRP_IPV4_IFADDR RTNLGRP_IPV4_IFADDR
519 #define RTNLGRP_IPV4_MROUTE RTNLGRP_IPV4_MROUTE
521 #define RTNLGRP_IPV4_ROUTE RTNLGRP_IPV4_ROUTE
523 #define RTNLGRP_IPV4_RULE RTNLGRP_IPV4_RULE
525 #define RTNLGRP_IPV6_IFADDR RTNLGRP_IPV6_IFADDR
527 #define RTNLGRP_IPV6_MROUTE RTNLGRP_IPV6_MROUTE
529 #define RTNLGRP_IPV6_ROUTE RTNLGRP_IPV6_ROUTE
531 #define RTNLGRP_IPV6_IFINFO RTNLGRP_IPV6_IFINFO
532 RTNLGRP_DECnet_IFADDR,
533 #define RTNLGRP_DECnet_IFADDR RTNLGRP_DECnet_IFADDR
535 RTNLGRP_DECnet_ROUTE,
536 #define RTNLGRP_DECnet_ROUTE RTNLGRP_DECnet_ROUTE
540 #define RTNLGRP_IPV6_PREFIX RTNLGRP_IPV6_PREFIX
542 #define RTNLGRP_IPV6_RULE RTNLGRP_IPV6_RULE
545 #define RTNLGRP_MAX (__RTNLGRP_MAX - 1)
547 /* TC action piece */
550 unsigned char tca_family;
551 unsigned char tca__pad1;
552 unsigned short tca__pad2;
554 #define TA_RTA(r) ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct tcamsg))))
555 #define TA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct tcamsg))
556 #define TCA_ACT_TAB 1 /* attr type must be >=1 */
559 /* End of information exported to user level */
563 #include <linux/mutex.h>
565 extern size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size);
566 static __inline__ int rtattr_strcmp(const struct rtattr *rta, const char *str)
568 int len = strlen(str) + 1;
569 return len > rta->rta_len || memcmp(RTA_DATA(rta), str, len);
572 extern int rtattr_parse(struct rtattr *tb[], int maxattr, struct rtattr *rta, int len);
574 #define rtattr_parse_nested(tb, max, rta) \
575 rtattr_parse((tb), (max), RTA_DATA((rta)), RTA_PAYLOAD((rta)))
577 extern struct sock *rtnl;
579 struct rtnetlink_link
581 int (*doit)(struct sk_buff *, struct nlmsghdr*, void *attr);
582 int (*dumpit)(struct sk_buff *, struct netlink_callback *cb);
585 extern struct rtnetlink_link * rtnetlink_links[NPROTO];
586 extern int rtnetlink_send(struct sk_buff *skb, u32 pid, u32 group, int echo);
587 extern int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics);
589 extern void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data);
591 #define RTA_PUT(skb, attrtype, attrlen, data) \
592 ({ if (unlikely(skb_tailroom(skb) < (int)RTA_SPACE(attrlen))) \
593 goto rtattr_failure; \
594 __rta_fill(skb, attrtype, attrlen, data); })
596 #define RTA_APPEND(skb, attrlen, data) \
597 ({ if (unlikely(skb_tailroom(skb) < (int)(attrlen))) \
598 goto rtattr_failure; \
599 memcpy(skb_put(skb, attrlen), data, attrlen); })
601 #define RTA_PUT_NOHDR(skb, attrlen, data) \
602 ({ RTA_APPEND(skb, RTA_ALIGN(attrlen), data); \
603 memset(skb->tail - (RTA_ALIGN(attrlen) - attrlen), 0, \
604 RTA_ALIGN(attrlen) - attrlen); })
606 #define RTA_PUT_U8(skb, attrtype, value) \
607 ({ u8 _tmp = (value); \
608 RTA_PUT(skb, attrtype, sizeof(u8), &_tmp); })
610 #define RTA_PUT_U16(skb, attrtype, value) \
611 ({ u16 _tmp = (value); \
612 RTA_PUT(skb, attrtype, sizeof(u16), &_tmp); })
614 #define RTA_PUT_U32(skb, attrtype, value) \
615 ({ u32 _tmp = (value); \
616 RTA_PUT(skb, attrtype, sizeof(u32), &_tmp); })
618 #define RTA_PUT_U64(skb, attrtype, value) \
619 ({ u64 _tmp = (value); \
620 RTA_PUT(skb, attrtype, sizeof(u64), &_tmp); })
622 #define RTA_PUT_SECS(skb, attrtype, value) \
623 RTA_PUT_U64(skb, attrtype, (value) / HZ)
625 #define RTA_PUT_MSECS(skb, attrtype, value) \
626 RTA_PUT_U64(skb, attrtype, jiffies_to_msecs(value))
628 #define RTA_PUT_STRING(skb, attrtype, value) \
629 RTA_PUT(skb, attrtype, strlen(value) + 1, value)
631 #define RTA_PUT_FLAG(skb, attrtype) \
632 RTA_PUT(skb, attrtype, 0, NULL);
634 #define RTA_NEST(skb, type) \
635 ({ struct rtattr *__start = (struct rtattr *) (skb)->tail; \
636 RTA_PUT(skb, type, 0, NULL); \
639 #define RTA_NEST_END(skb, start) \
640 ({ (start)->rta_len = ((skb)->tail - (unsigned char *) (start)); \
643 #define RTA_NEST_CANCEL(skb, start) \
645 skb_trim(skb, (unsigned char *) (start) - (skb)->data); \
648 #define RTA_GET_U8(rta) \
649 ({ if (!rta || RTA_PAYLOAD(rta) < sizeof(u8)) \
650 goto rtattr_failure; \
651 *(u8 *) RTA_DATA(rta); })
653 #define RTA_GET_U16(rta) \
654 ({ if (!rta || RTA_PAYLOAD(rta) < sizeof(u16)) \
655 goto rtattr_failure; \
656 *(u16 *) RTA_DATA(rta); })
658 #define RTA_GET_U32(rta) \
659 ({ if (!rta || RTA_PAYLOAD(rta) < sizeof(u32)) \
660 goto rtattr_failure; \
661 *(u32 *) RTA_DATA(rta); })
663 #define RTA_GET_U64(rta) \
665 if (!rta || RTA_PAYLOAD(rta) < sizeof(u64)) \
666 goto rtattr_failure; \
667 memcpy(&_tmp, RTA_DATA(rta), sizeof(_tmp)); \
670 #define RTA_GET_FLAG(rta) (!!(rta))
672 #define RTA_GET_SECS(rta) ((unsigned long) RTA_GET_U64(rta) * HZ)
673 #define RTA_GET_MSECS(rta) (msecs_to_jiffies((unsigned long) RTA_GET_U64(rta)))
675 static inline struct rtattr *
676 __rta_reserve(struct sk_buff *skb, int attrtype, int attrlen)
679 int size = RTA_LENGTH(attrlen);
681 rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size));
682 rta->rta_type = attrtype;
684 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
688 #define __RTA_PUT(skb, attrtype, attrlen) \
689 ({ if (unlikely(skb_tailroom(skb) < (int)RTA_SPACE(attrlen))) \
690 goto rtattr_failure; \
691 __rta_reserve(skb, attrtype, attrlen); })
693 extern void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change);
695 /* RTNL is used as a global lock for all changes to network configuration */
696 extern void rtnl_lock(void);
697 extern void rtnl_unlock(void);
698 extern int rtnl_trylock(void);
700 extern void rtnetlink_init(void);
701 extern void __rtnl_unlock(void);
703 #define ASSERT_RTNL() do { \
704 if (unlikely(rtnl_trylock())) { \
706 printk(KERN_ERR "RTNL: assertion failed at %s (%d)\n", \
707 __FILE__, __LINE__); \
712 #define BUG_TRAP(x) do { \
713 if (unlikely(!(x))) { \
714 printk(KERN_ERR "KERNEL: assertion (%s) failed at %s (%d)\n", \
715 #x, __FILE__ , __LINE__); \
719 #endif /* __KERNEL__ */
722 #endif /* __LINUX_RTNETLINK_H */