1 #ifndef __LINUX_RTNETLINK_H
2 #define __LINUX_RTNETLINK_H
4 #include <linux/config.h>
5 #include <linux/netlink.h>
11 * Routing/neighbour discovery messages.
14 /* Types of messages */
18 #define RTM_NEWLINK (RTM_BASE+0)
19 #define RTM_DELLINK (RTM_BASE+1)
20 #define RTM_GETLINK (RTM_BASE+2)
22 #define RTM_NEWADDR (RTM_BASE+4)
23 #define RTM_DELADDR (RTM_BASE+5)
24 #define RTM_GETADDR (RTM_BASE+6)
26 #define RTM_NEWROUTE (RTM_BASE+8)
27 #define RTM_DELROUTE (RTM_BASE+9)
28 #define RTM_GETROUTE (RTM_BASE+10)
30 #define RTM_NEWNEIGH (RTM_BASE+12)
31 #define RTM_DELNEIGH (RTM_BASE+13)
32 #define RTM_GETNEIGH (RTM_BASE+14)
34 #define RTM_NEWRULE (RTM_BASE+16)
35 #define RTM_DELRULE (RTM_BASE+17)
36 #define RTM_GETRULE (RTM_BASE+18)
38 #define RTM_NEWQDISC (RTM_BASE+20)
39 #define RTM_DELQDISC (RTM_BASE+21)
40 #define RTM_GETQDISC (RTM_BASE+22)
42 #define RTM_NEWTCLASS (RTM_BASE+24)
43 #define RTM_DELTCLASS (RTM_BASE+25)
44 #define RTM_GETTCLASS (RTM_BASE+26)
46 #define RTM_NEWTFILTER (RTM_BASE+28)
47 #define RTM_DELTFILTER (RTM_BASE+29)
48 #define RTM_GETTFILTER (RTM_BASE+30)
50 #define RTM_MAX (RTM_BASE+31)
53 Generic structure for encapsulation optional route information.
54 It is reminiscent of sockaddr, but with sa_family replaced
60 unsigned short rta_len
;
61 unsigned short rta_type
;
64 /* Macros to handle rtattributes */
67 #define RTA_ALIGN(len) ( ((len)+RTA_ALIGNTO-1) & ~(RTA_ALIGNTO-1) )
68 #define RTA_OK(rta,len) ((len) > 0 && (rta)->rta_len >= sizeof(struct rtattr) && \
69 (rta)->rta_len <= (len))
70 #define RTA_NEXT(rta,attrlen) ((attrlen) -= RTA_ALIGN((rta)->rta_len), \
71 (struct rtattr*)(((char*)(rta)) + RTA_ALIGN((rta)->rta_len)))
72 #define RTA_LENGTH(len) (RTA_ALIGN(sizeof(struct rtattr)) + (len))
73 #define RTA_SPACE(len) RTA_ALIGN(RTA_LENGTH(len))
74 #define RTA_DATA(rta) ((void*)(((char*)(rta)) + RTA_LENGTH(0)))
75 #define RTA_PAYLOAD(rta) ((int)((rta)->rta_len) - RTA_LENGTH(0))
80 /******************************************************************************
81 * Definitions used in routing table administation.
86 unsigned char rtm_family
;
87 unsigned char rtm_dst_len
;
88 unsigned char rtm_src_len
;
89 unsigned char rtm_tos
;
91 unsigned char rtm_table
; /* Routing table id */
92 unsigned char rtm_protocol
; /* Routing protocol; see below */
93 unsigned char rtm_scope
; /* See below */
94 unsigned char rtm_type
; /* See below */
104 RTN_UNICAST
, /* Gateway or direct route */
105 RTN_LOCAL
, /* Accept locally */
106 RTN_BROADCAST
, /* Accept locally as broadcast,
108 RTN_ANYCAST
, /* Accept locally as broadcast,
109 but send as unicast */
110 RTN_MULTICAST
, /* Multicast route */
111 RTN_BLACKHOLE
, /* Drop */
112 RTN_UNREACHABLE
, /* Destination is unreachable */
113 RTN_PROHIBIT
, /* Administratively prohibited */
114 RTN_THROW
, /* Not in this table */
115 RTN_NAT
, /* Translate this address */
116 RTN_XRESOLVE
, /* Use external resolver */
119 #define RTN_MAX RTN_XRESOLVE
124 #define RTPROT_UNSPEC 0
125 #define RTPROT_REDIRECT 1 /* Route installed by ICMP redirects;
126 not used by current IPv4 */
127 #define RTPROT_KERNEL 2 /* Route installed by kernel */
128 #define RTPROT_BOOT 3 /* Route installed during boot */
129 #define RTPROT_STATIC 4 /* Route installed by administrator */
131 /* Values of protocol >= RTPROT_STATIC are not interpreted by kernel;
132 they just passed from user and back as is.
133 It will be used by hypothetical multiple routing daemons.
134 Note that protocol values should be standardized in order to
138 #define RTPROT_GATED 8 /* Apparently, GateD */
139 #define RTPROT_RA 9 /* RDISC/ND router advertisments */
140 #define RTPROT_MRT 10 /* Merit MRT */
141 #define RTPROT_ZEBRA 11 /* Zebra */
142 #define RTPROT_BIRD 12 /* BIRD */
146 Really it is not scope, but sort of distance to the destination.
147 NOWHERE are reserved for not existing destinations, HOST is our
148 local addresses, LINK are destinations, located on directly attached
149 link and UNIVERSE is everywhere in the Universe.
151 Intermediate values are also possible f.e. interior routes
152 could be assigned a value between UNIVERSE and LINK.
158 /* User defined values */
167 #define RTM_F_NOTIFY 0x100 /* Notify user of route change */
168 #define RTM_F_CLONED 0x200 /* This route is cloned */
169 #define RTM_F_EQUALIZE 0x400 /* Multipath equalizer: NI */
171 /* Reserved table identifiers */
176 /* User defined values */
177 RT_TABLE_DEFAULT
=253,
181 #define RT_TABLE_MAX RT_TABLE_LOCAL
185 /* Routing message attributes */
204 #define RTA_MAX RTA_CACHEINFO
206 #define RTM_RTA(r) ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct rtmsg))))
207 #define RTM_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct rtmsg))
209 /* RTM_MULTIPATH --- array of struct rtnexthop.
211 * "struct rtnexthop" describres all necessary nexthop information,
212 * i.e. parameters of path to a destination via this nextop.
214 * At the moment it is impossible to set different prefsrc, mtu, window
215 * and rtt for different paths from multipath.
220 unsigned short rtnh_len
;
221 unsigned char rtnh_flags
;
222 unsigned char rtnh_hops
;
228 #define RTNH_F_DEAD 1 /* Nexthop is dead (used by multipath) */
229 #define RTNH_F_PERVASIVE 2 /* Do recursive gateway lookup */
230 #define RTNH_F_ONLINK 4 /* Gateway is forced on link */
232 /* Macros to handle hexthops */
234 #define RTNH_ALIGNTO 4
235 #define RTNH_ALIGN(len) ( ((len)+RTNH_ALIGNTO-1) & ~(RTNH_ALIGNTO-1) )
236 #define RTNH_OK(rtnh,len) ((rtnh)->rtnh_len >= sizeof(struct rtnexthop) && \
237 ((int)(rtnh)->rtnh_len) <= (len))
238 #define RTNH_NEXT(rtnh) ((struct rtnexthop*)(((char*)(rtnh)) + RTNH_ALIGN((rtnh)->rtnh_len)))
239 #define RTNH_LENGTH(len) (RTNH_ALIGN(sizeof(struct rtnexthop)) + (len))
240 #define RTNH_SPACE(len) RTNH_ALIGN(RTNH_LENGTH(len))
241 #define RTNH_DATA(rtnh) ((struct rtattr*)(((char*)(rtnh)) + RTNH_LENGTH(0)))
254 /* RTM_METRICS --- array of struct rtattr with types of RTAX_* */
268 #define RTAX_MAX RTAX_CWND
272 /*********************************************************
278 unsigned char ifa_family
;
279 unsigned char ifa_prefixlen
; /* The prefix length */
280 unsigned char ifa_flags
; /* Flags */
281 unsigned char ifa_scope
; /* See above */
282 int ifa_index
; /* Link index */
296 #define IFA_MAX IFA_CACHEINFO
300 #define IFA_F_SECONDARY 0x01
302 #define IFA_F_DEPRECATED 0x20
303 #define IFA_F_TENTATIVE 0x40
304 #define IFA_F_PERMANENT 0x80
313 #define IFA_RTA(r) ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ifaddrmsg))))
314 #define IFA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct ifaddrmsg))
318 IFA_ADDRESS is prefix address, rather than local interface address.
319 It makes no difference for normally configured broadcast interfaces,
320 but for point-to-point IFA_ADDRESS is DESTINATION address,
321 local address is supplied in IFA_LOCAL attribute.
324 /**************************************************************
325 * Neighbour discovery.
330 unsigned char ndm_family
;
331 unsigned char ndm_pad1
;
332 unsigned short ndm_pad2
;
333 int ndm_ifindex
; /* Link index */
347 #define NDA_MAX NDA_CACHEINFO
349 #define NDA_RTA(r) ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ndmsg))))
350 #define NDA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct ndmsg))
353 * Neighbor Cache Entry Flags
356 #define NTF_PROXY 0x08 /* == ATF_PUBL */
357 #define NTF_ROUTER 0x80
360 * Neighbor Cache Entry States.
363 #define NUD_INCOMPLETE 0x01
364 #define NUD_REACHABLE 0x02
365 #define NUD_STALE 0x04
366 #define NUD_DELAY 0x08
367 #define NUD_PROBE 0x10
368 #define NUD_FAILED 0x20
371 #define NUD_NOARP 0x40
372 #define NUD_PERMANENT 0x80
373 #define NUD_NONE 0x00
385 * General form of address family dependent message.
390 unsigned char rtgen_family
;
393 /*****************************************************************
394 * Link layer specific messages.
398 * passes link level specific information, not dependent
399 * on network protocol.
404 unsigned char ifi_family
;
405 unsigned char __ifi_pad
;
406 unsigned short ifi_type
; /* ARPHRD_* */
407 int ifi_index
; /* Link index */
408 unsigned ifi_flags
; /* IFF_* flags */
409 unsigned ifi_change
; /* IFF_* change mask */
427 #define IFLA_MAX IFLA_STATS
429 #define IFLA_RTA(r) ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ifinfomsg))))
430 #define IFLA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct ifinfomsg))
437 IFF_LOOPBACK, IFF_BROADCAST and IFF_POINTOPOINT are
438 more not changeable by user. They describe link media
439 characteristics and set by device driver.
442 - Combination IFF_BROADCAST|IFF_POINTOPOINT is invalid
443 - If neiher of these three flags are set;
444 the interface is NBMA.
446 - IFF_MULTICAST does not mean anything special:
447 multicasts can be used on all not-NBMA links.
448 IFF_MULTICAST means that this media uses special encapsulation
449 for multicast frames. Apparently, all IFF_POINTOPOINT and
450 IFF_BROADCAST devices are able to use multicasts too.
454 For usual devices it is equal ifi_index.
455 If it is a "virtual interface" (f.e. tunnel), ifi_link
456 can point to real physical interface (f.e. for bandwidth calculations),
457 or maybe 0, what means, that real media is unknown (usual
458 for IPIP tunnels, when route to endpoint is allowed to change)
461 /*****************************************************************
462 * Traffic control messages.
467 unsigned char tcm_family
;
468 unsigned char tcm__pad1
;
469 unsigned short tcm__pad2
;
486 #define TCA_MAX TCA_RATE
488 #define TCA_RTA(r) ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct tcmsg))))
489 #define TCA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct tcmsg))
492 /* SUMMARY: maximal rtattr understood by kernel */
494 #define RTATTR_MAX RTA_MAX
496 /* RTnetlink multicast groups */
498 #define RTMGRP_LINK 1
499 #define RTMGRP_NOTIFY 2
500 #define RTMGRP_NEIGH 4
503 #define RTMGRP_IPV4_IFADDR 0x10
504 #define RTMGRP_IPV4_MROUTE 0x20
505 #define RTMGRP_IPV4_ROUTE 0x40
507 #define RTMGRP_IPV6_IFADDR 0x100
508 #define RTMGRP_IPV6_MROUTE 0x200
509 #define RTMGRP_IPV6_ROUTE 0x400
511 #define RTMGRP_DECnet_IFADDR 0x1000
512 #define RTMGRP_DECnet_ROUTE 0x4000
514 /* End of information exported to user level */
518 extern __inline__
int rtattr_strcmp(struct rtattr
*rta
, char *str
)
520 int len
= strlen(str
) + 1;
521 return len
> rta
->rta_len
|| memcmp(RTA_DATA(rta
), str
, len
);
524 extern int rtattr_parse(struct rtattr
*tb
[], int maxattr
, struct rtattr
*rta
, int len
);
526 #ifdef CONFIG_RTNETLINK
527 extern struct sock
*rtnl
;
529 struct rtnetlink_link
531 int (*doit
)(struct sk_buff
*, struct nlmsghdr
*, void *attr
);
532 int (*dumpit
)(struct sk_buff
*, struct netlink_callback
*cb
);
535 extern struct rtnetlink_link
* rtnetlink_links
[NPROTO
];
536 extern int rtnetlink_dump_ifinfo(struct sk_buff
*skb
, struct netlink_callback
*cb
);
537 extern int rtnetlink_send(struct sk_buff
*skb
, u32 pid
, u32 group
, int echo
);
539 extern void __rta_fill(struct sk_buff
*skb
, int attrtype
, int attrlen
, const void *data
);
541 #define RTA_PUT(skb, attrtype, attrlen, data) \
542 ({ if (skb_tailroom(skb) < (int)RTA_SPACE(attrlen)) goto rtattr_failure; \
543 __rta_fill(skb, attrtype, attrlen, data); })
546 extern struct semaphore rtnl_sem
;
548 #define rtnl_exlock() do { } while(0)
549 #define rtnl_exunlock() do { } while(0)
550 #define rtnl_exlock_nowait() (0)
552 #define rtnl_shlock() down(&rtnl_sem)
553 #define rtnl_shlock_nowait() down_trylock(&rtnl_sem)
555 #ifndef CONFIG_RTNETLINK
556 #define rtnl_shunlock() up(&rtnl_sem)
558 #define rtnl_shunlock() do { up(&rtnl_sem); \
559 if (rtnl && rtnl->receive_queue.qlen) \
560 rtnl->data_ready(rtnl, 0); \
564 extern void rtnl_lock(void);
565 extern void rtnl_unlock(void);
566 extern void rtnetlink_init(void);
570 #endif /* __KERNEL__ */
573 #endif /* __LINUX_RTNETLINK_H */