1 #ifndef __LINUX_RTNETLINK_H
2 #define __LINUX_RTNETLINK_H
4 #include <linux/netlink.h>
5 #include <linux/if_link.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,
242 RT_TABLE_MAX=0xFFFFFFFF
246 /* Routing message attributes */
269 #define RTA_MAX (__RTA_MAX - 1)
271 #define RTM_RTA(r) ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct rtmsg))))
272 #define RTM_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct rtmsg))
274 /* RTM_MULTIPATH --- array of struct rtnexthop.
276 * "struct rtnexthop" describes all necessary nexthop information,
277 * i.e. parameters of path to a destination via this nexthop.
279 * At the moment it is impossible to set different prefsrc, mtu, window
280 * and rtt for different paths from multipath.
285 unsigned short rtnh_len;
286 unsigned char rtnh_flags;
287 unsigned char rtnh_hops;
293 #define RTNH_F_DEAD 1 /* Nexthop is dead (used by multipath) */
294 #define RTNH_F_PERVASIVE 2 /* Do recursive gateway lookup */
295 #define RTNH_F_ONLINK 4 /* Gateway is forced on link */
297 /* Macros to handle hexthops */
299 #define RTNH_ALIGNTO 4
300 #define RTNH_ALIGN(len) ( ((len)+RTNH_ALIGNTO-1) & ~(RTNH_ALIGNTO-1) )
301 #define RTNH_OK(rtnh,len) ((rtnh)->rtnh_len >= sizeof(struct rtnexthop) && \
302 ((int)(rtnh)->rtnh_len) <= (len))
303 #define RTNH_NEXT(rtnh) ((struct rtnexthop*)(((char*)(rtnh)) + RTNH_ALIGN((rtnh)->rtnh_len)))
304 #define RTNH_LENGTH(len) (RTNH_ALIGN(sizeof(struct rtnexthop)) + (len))
305 #define RTNH_SPACE(len) RTNH_ALIGN(RTNH_LENGTH(len))
306 #define RTNH_DATA(rtnh) ((struct rtattr*)(((char*)(rtnh)) + RTNH_LENGTH(0)))
318 #define RTNETLINK_HAVE_PEERINFO 1
324 /* RTM_METRICS --- array of struct rtattr with types of RTAX_* */
329 #define RTAX_UNSPEC RTAX_UNSPEC
331 #define RTAX_LOCK RTAX_LOCK
333 #define RTAX_MTU RTAX_MTU
335 #define RTAX_WINDOW RTAX_WINDOW
337 #define RTAX_RTT RTAX_RTT
339 #define RTAX_RTTVAR RTAX_RTTVAR
341 #define RTAX_SSTHRESH RTAX_SSTHRESH
343 #define RTAX_CWND RTAX_CWND
345 #define RTAX_ADVMSS RTAX_ADVMSS
347 #define RTAX_REORDERING RTAX_REORDERING
349 #define RTAX_HOPLIMIT RTAX_HOPLIMIT
351 #define RTAX_INITCWND RTAX_INITCWND
353 #define RTAX_FEATURES RTAX_FEATURES
357 #define RTAX_MAX (__RTAX_MAX - 1)
359 #define RTAX_FEATURE_ECN 0x00000001
360 #define RTAX_FEATURE_SACK 0x00000002
361 #define RTAX_FEATURE_TIMESTAMP 0x00000004
362 #define RTAX_FEATURE_ALLFRAG 0x00000008
387 * General form of address family dependent message.
392 unsigned char rtgen_family;
395 /*****************************************************************
396 * Link layer specific messages.
400 * passes link level specific information, not dependent
401 * on network protocol.
406 unsigned char ifi_family;
407 unsigned char __ifi_pad;
408 unsigned short ifi_type; /* ARPHRD_* */
409 int ifi_index; /* Link index */
410 unsigned ifi_flags; /* IFF_* flags */
411 unsigned ifi_change; /* IFF_* change mask */
414 /********************************************************************
420 unsigned char prefix_family;
421 unsigned char prefix_pad1;
422 unsigned short prefix_pad2;
424 unsigned char prefix_type;
425 unsigned char prefix_len;
426 unsigned char prefix_flags;
427 unsigned char prefix_pad3;
438 #define PREFIX_MAX (__PREFIX_MAX - 1)
440 struct prefix_cacheinfo
442 __u32 preferred_time;
447 /*****************************************************************
448 * Traffic control messages.
453 unsigned char tcm_family;
454 unsigned char tcm__pad1;
455 unsigned short tcm__pad2;
475 #define TCA_MAX (__TCA_MAX - 1)
477 #define TCA_RTA(r) ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct tcmsg))))
478 #define TCA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct tcmsg))
481 /* RTnetlink multicast groups - backwards compatibility for userspace */
482 #define RTMGRP_LINK 1
483 #define RTMGRP_NOTIFY 2
484 #define RTMGRP_NEIGH 4
487 #define RTMGRP_IPV4_IFADDR 0x10
488 #define RTMGRP_IPV4_MROUTE 0x20
489 #define RTMGRP_IPV4_ROUTE 0x40
490 #define RTMGRP_IPV4_RULE 0x80
492 #define RTMGRP_IPV6_IFADDR 0x100
493 #define RTMGRP_IPV6_MROUTE 0x200
494 #define RTMGRP_IPV6_ROUTE 0x400
495 #define RTMGRP_IPV6_IFINFO 0x800
497 #define RTMGRP_DECnet_IFADDR 0x1000
498 #define RTMGRP_DECnet_ROUTE 0x4000
500 #define RTMGRP_IPV6_PREFIX 0x20000
503 /* RTnetlink multicast groups */
504 enum rtnetlink_groups {
506 #define RTNLGRP_NONE RTNLGRP_NONE
508 #define RTNLGRP_LINK RTNLGRP_LINK
510 #define RTNLGRP_NOTIFY RTNLGRP_NOTIFY
512 #define RTNLGRP_NEIGH RTNLGRP_NEIGH
514 #define RTNLGRP_TC RTNLGRP_TC
516 #define RTNLGRP_IPV4_IFADDR RTNLGRP_IPV4_IFADDR
518 #define RTNLGRP_IPV4_MROUTE RTNLGRP_IPV4_MROUTE
520 #define RTNLGRP_IPV4_ROUTE RTNLGRP_IPV4_ROUTE
522 #define RTNLGRP_IPV4_RULE RTNLGRP_IPV4_RULE
524 #define RTNLGRP_IPV6_IFADDR RTNLGRP_IPV6_IFADDR
526 #define RTNLGRP_IPV6_MROUTE RTNLGRP_IPV6_MROUTE
528 #define RTNLGRP_IPV6_ROUTE RTNLGRP_IPV6_ROUTE
530 #define RTNLGRP_IPV6_IFINFO RTNLGRP_IPV6_IFINFO
531 RTNLGRP_DECnet_IFADDR,
532 #define RTNLGRP_DECnet_IFADDR RTNLGRP_DECnet_IFADDR
534 RTNLGRP_DECnet_ROUTE,
535 #define RTNLGRP_DECnet_ROUTE RTNLGRP_DECnet_ROUTE
537 #define RTNLGRP_DECnet_RULE RTNLGRP_DECnet_RULE
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 struct rtnetlink_link
579 int (*doit)(struct sk_buff *, struct nlmsghdr*, void *attr);
580 int (*dumpit)(struct sk_buff *, struct netlink_callback *cb);
583 extern struct rtnetlink_link * rtnetlink_links[NPROTO];
584 extern int rtnetlink_send(struct sk_buff *skb, u32 pid, u32 group, int echo);
585 extern int rtnl_unicast(struct sk_buff *skb, u32 pid);
586 extern int rtnl_notify(struct sk_buff *skb, u32 pid, u32 group,
587 struct nlmsghdr *nlh, gfp_t flags);
588 extern void rtnl_set_sk_err(u32 group, int error);
589 extern int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics);
591 extern void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data);
593 #define RTA_PUT(skb, attrtype, attrlen, data) \
594 ({ if (unlikely(skb_tailroom(skb) < (int)RTA_SPACE(attrlen))) \
595 goto rtattr_failure; \
596 __rta_fill(skb, attrtype, attrlen, data); })
598 #define RTA_APPEND(skb, attrlen, data) \
599 ({ if (unlikely(skb_tailroom(skb) < (int)(attrlen))) \
600 goto rtattr_failure; \
601 memcpy(skb_put(skb, attrlen), data, attrlen); })
603 #define RTA_PUT_NOHDR(skb, attrlen, data) \
604 ({ RTA_APPEND(skb, RTA_ALIGN(attrlen), data); \
605 memset(skb->tail - (RTA_ALIGN(attrlen) - attrlen), 0, \
606 RTA_ALIGN(attrlen) - attrlen); })
608 #define RTA_PUT_U8(skb, attrtype, value) \
609 ({ u8 _tmp = (value); \
610 RTA_PUT(skb, attrtype, sizeof(u8), &_tmp); })
612 #define RTA_PUT_U16(skb, attrtype, value) \
613 ({ u16 _tmp = (value); \
614 RTA_PUT(skb, attrtype, sizeof(u16), &_tmp); })
616 #define RTA_PUT_U32(skb, attrtype, value) \
617 ({ u32 _tmp = (value); \
618 RTA_PUT(skb, attrtype, sizeof(u32), &_tmp); })
620 #define RTA_PUT_U64(skb, attrtype, value) \
621 ({ u64 _tmp = (value); \
622 RTA_PUT(skb, attrtype, sizeof(u64), &_tmp); })
624 #define RTA_PUT_SECS(skb, attrtype, value) \
625 RTA_PUT_U64(skb, attrtype, (value) / HZ)
627 #define RTA_PUT_MSECS(skb, attrtype, value) \
628 RTA_PUT_U64(skb, attrtype, jiffies_to_msecs(value))
630 #define RTA_PUT_STRING(skb, attrtype, value) \
631 RTA_PUT(skb, attrtype, strlen(value) + 1, value)
633 #define RTA_PUT_FLAG(skb, attrtype) \
634 RTA_PUT(skb, attrtype, 0, NULL);
636 #define RTA_NEST(skb, type) \
637 ({ struct rtattr *__start = (struct rtattr *) (skb)->tail; \
638 RTA_PUT(skb, type, 0, NULL); \
641 #define RTA_NEST_END(skb, start) \
642 ({ (start)->rta_len = ((skb)->tail - (unsigned char *) (start)); \
645 #define RTA_NEST_CANCEL(skb, start) \
647 skb_trim(skb, (unsigned char *) (start) - (skb)->data); \
650 #define RTA_GET_U8(rta) \
651 ({ if (!rta || RTA_PAYLOAD(rta) < sizeof(u8)) \
652 goto rtattr_failure; \
653 *(u8 *) RTA_DATA(rta); })
655 #define RTA_GET_U16(rta) \
656 ({ if (!rta || RTA_PAYLOAD(rta) < sizeof(u16)) \
657 goto rtattr_failure; \
658 *(u16 *) RTA_DATA(rta); })
660 #define RTA_GET_U32(rta) \
661 ({ if (!rta || RTA_PAYLOAD(rta) < sizeof(u32)) \
662 goto rtattr_failure; \
663 *(u32 *) RTA_DATA(rta); })
665 #define RTA_GET_U64(rta) \
667 if (!rta || RTA_PAYLOAD(rta) < sizeof(u64)) \
668 goto rtattr_failure; \
669 memcpy(&_tmp, RTA_DATA(rta), sizeof(_tmp)); \
672 #define RTA_GET_FLAG(rta) (!!(rta))
674 #define RTA_GET_SECS(rta) ((unsigned long) RTA_GET_U64(rta) * HZ)
675 #define RTA_GET_MSECS(rta) (msecs_to_jiffies((unsigned long) RTA_GET_U64(rta)))
677 static inline struct rtattr *
678 __rta_reserve(struct sk_buff *skb, int attrtype, int attrlen)
681 int size = RTA_LENGTH(attrlen);
683 rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size));
684 rta->rta_type = attrtype;
686 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
690 #define __RTA_PUT(skb, attrtype, attrlen) \
691 ({ if (unlikely(skb_tailroom(skb) < (int)RTA_SPACE(attrlen))) \
692 goto rtattr_failure; \
693 __rta_reserve(skb, attrtype, attrlen); })
695 extern void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change);
697 /* RTNL is used as a global lock for all changes to network configuration */
698 extern void rtnl_lock(void);
699 extern void rtnl_unlock(void);
700 extern int rtnl_trylock(void);
702 extern void rtnetlink_init(void);
703 extern void __rtnl_unlock(void);
705 #define ASSERT_RTNL() do { \
706 if (unlikely(rtnl_trylock())) { \
708 printk(KERN_ERR "RTNL: assertion failed at %s (%d)\n", \
709 __FILE__, __LINE__); \
714 #define BUG_TRAP(x) do { \
715 if (unlikely(!(x))) { \
716 printk(KERN_ERR "KERNEL: assertion (%s) failed at %s (%d)\n", \
717 #x, __FILE__ , __LINE__); \
721 static inline u32 rtm_get_table(struct rtattr **rta, u8 table)
723 return RTA_GET_U32(rta[RTA_TABLE-1]);
728 #endif /* __KERNEL__ */
731 #endif /* __LINUX_RTNETLINK_H */