include/linux/rtnetlink.h

   1 #ifndef __LINUX_RTNETLINK_H
   2 #define __LINUX_RTNETLINK_H
   3
   4 #include <linux/netlink.h>
   5 #include <linux/if_link.h>
   6 #include <linux/if_addr.h>
   7 #include <linux/neighbour.h>
   8
   9 /****
  10  *              Routing/neighbour discovery messages.
  11  ****/
  12
  13 /* Types of messages */
  14
  15 enum {
  16         RTM_BASE        = 16,
  17 #define RTM_BASE        RTM_BASE
  18
  19         RTM_NEWLINK     = 16,
  20 #define RTM_NEWLINK     RTM_NEWLINK
  21         RTM_DELLINK,
  22 #define RTM_DELLINK     RTM_DELLINK
  23         RTM_GETLINK,
  24 #define RTM_GETLINK     RTM_GETLINK
  25         RTM_SETLINK,
  26 #define RTM_SETLINK     RTM_SETLINK
  27
  28         RTM_NEWADDR     = 20,
  29 #define RTM_NEWADDR     RTM_NEWADDR
  30         RTM_DELADDR,
  31 #define RTM_DELADDR     RTM_DELADDR
  32         RTM_GETADDR,
  33 #define RTM_GETADDR     RTM_GETADDR
  34
  35         RTM_NEWROUTE    = 24,
  36 #define RTM_NEWROUTE    RTM_NEWROUTE
  37         RTM_DELROUTE,
  38 #define RTM_DELROUTE    RTM_DELROUTE
  39         RTM_GETROUTE,
  40 #define RTM_GETROUTE    RTM_GETROUTE
  41
  42         RTM_NEWNEIGH    = 28,
  43 #define RTM_NEWNEIGH    RTM_NEWNEIGH
  44         RTM_DELNEIGH,
  45 #define RTM_DELNEIGH    RTM_DELNEIGH
  46         RTM_GETNEIGH,
  47 #define RTM_GETNEIGH    RTM_GETNEIGH
  48
  49         RTM_NEWRULE     = 32,
  50 #define RTM_NEWRULE     RTM_NEWRULE
  51         RTM_DELRULE,
  52 #define RTM_DELRULE     RTM_DELRULE
  53         RTM_GETRULE,
  54 #define RTM_GETRULE     RTM_GETRULE
  55
  56         RTM_NEWQDISC    = 36,
  57 #define RTM_NEWQDISC    RTM_NEWQDISC
  58         RTM_DELQDISC,
  59 #define RTM_DELQDISC    RTM_DELQDISC
  60         RTM_GETQDISC,
  61 #define RTM_GETQDISC    RTM_GETQDISC
  62
  63         RTM_NEWTCLASS   = 40,
  64 #define RTM_NEWTCLASS   RTM_NEWTCLASS
  65         RTM_DELTCLASS,
  66 #define RTM_DELTCLASS   RTM_DELTCLASS
  67         RTM_GETTCLASS,
  68 #define RTM_GETTCLASS   RTM_GETTCLASS
  69
  70         RTM_NEWTFILTER  = 44,
  71 #define RTM_NEWTFILTER  RTM_NEWTFILTER
  72         RTM_DELTFILTER,
  73 #define RTM_DELTFILTER  RTM_DELTFILTER
  74         RTM_GETTFILTER,
  75 #define RTM_GETTFILTER  RTM_GETTFILTER
  76
  77         RTM_NEWACTION   = 48,
  78 #define RTM_NEWACTION   RTM_NEWACTION
  79         RTM_DELACTION,
  80 #define RTM_DELACTION   RTM_DELACTION
  81         RTM_GETACTION,
  82 #define RTM_GETACTION   RTM_GETACTION
  83
  84         RTM_NEWPREFIX   = 52,
  85 #define RTM_NEWPREFIX   RTM_NEWPREFIX
  86
  87         RTM_GETMULTICAST = 58,
  88 #define RTM_GETMULTICAST RTM_GETMULTICAST
  89
  90         RTM_GETANYCAST  = 62,
  91 #define RTM_GETANYCAST  RTM_GETANYCAST
  92
  93         RTM_NEWNEIGHTBL = 64,
  94 #define RTM_NEWNEIGHTBL RTM_NEWNEIGHTBL
  95         RTM_GETNEIGHTBL = 66,
  96 #define RTM_GETNEIGHTBL RTM_GETNEIGHTBL
  97         RTM_SETNEIGHTBL,
  98 #define RTM_SETNEIGHTBL RTM_SETNEIGHTBL
  99
 100         __RTM_MAX,
 101 #define RTM_MAX         (((__RTM_MAX + 3) & ~3) - 1)
 102 };
 103
 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)
 107
 108 /*
 109    Generic structure for encapsulation of optional route information.
 110    It is reminiscent of sockaddr, but with sa_family replaced
 111    with attribute type.
 112  */
 113
 114 struct rtattr
 115 {
 116         unsigned short  rta_len;
 117         unsigned short  rta_type;
 118 };
 119
 120 /* Macros to handle rtattributes */
 121
 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))
 133
 134
 135
 136
 137 /******************************************************************************
 138  *              Definitions used in routing table administration.
 139  ****/
 140
 141 struct rtmsg
 142 {
 143         unsigned char           rtm_family;
 144         unsigned char           rtm_dst_len;
 145         unsigned char           rtm_src_len;
 146         unsigned char           rtm_tos;
 147
 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    */
 152
 153         unsigned                rtm_flags;
 154 };
 155
 156 /* rtm_type */
 157
 158 enum
 159 {
 160         RTN_UNSPEC,
 161         RTN_UNICAST,            /* Gateway or direct route      */
 162         RTN_LOCAL,              /* Accept locally               */
 163         RTN_BROADCAST,          /* Accept locally as broadcast,
 164                                    send 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        */
 174         __RTN_MAX
 175 };
 176
 177 #define RTN_MAX (__RTN_MAX - 1)
 178
 179
 180 /* rtm_protocol */
 181
 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     */
 188
 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
 193    avoid conflicts.
 194  */
 195
 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 */
 204
 205 /* rtm_scope
 206
 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.
 211
 212    Intermediate values are also possible f.e. interior routes
 213    could be assigned a value between UNIVERSE and LINK.
 214 */
 215
 216 enum rt_scope_t
 217 {
 218         RT_SCOPE_UNIVERSE=0,
 219 /* User defined values  */
 220         RT_SCOPE_SITE=200,
 221         RT_SCOPE_LINK=253,
 222         RT_SCOPE_HOST=254,
 223         RT_SCOPE_NOWHERE=255
 224 };
 225
 226 /* rtm_flags */
 227
 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             */
 232
 233 /* Reserved table identifiers */
 234
 235 enum rt_class_t
 236 {
 237         RT_TABLE_UNSPEC=0,
 238 /* User defined values */
 239         RT_TABLE_DEFAULT=253,
 240         RT_TABLE_MAIN=254,
 241         RT_TABLE_LOCAL=255,
 242         RT_TABLE_MAX=0xFFFFFFFF
 243 };
 244
 245
 246 /* Routing message attributes */
 247
 248 enum rtattr_type_t
 249 {
 250         RTA_UNSPEC,
 251         RTA_DST,
 252         RTA_SRC,
 253         RTA_IIF,
 254         RTA_OIF,
 255         RTA_GATEWAY,
 256         RTA_PRIORITY,
 257         RTA_PREFSRC,
 258         RTA_METRICS,
 259         RTA_MULTIPATH,
 260         RTA_PROTOINFO,
 261         RTA_FLOW,
 262         RTA_CACHEINFO,
 263         RTA_SESSION,
 264         RTA_MP_ALGO, /* no longer used */
 265         RTA_TABLE,
 266         __RTA_MAX
 267 };
 268
 269 #define RTA_MAX (__RTA_MAX - 1)
 270
 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))
 273
 274 /* RTM_MULTIPATH --- array of struct rtnexthop.
 275  *
 276  * "struct rtnexthop" describes all necessary nexthop information,
 277  * i.e. parameters of path to a destination via this nexthop.
 278  *
 279  * At the moment it is impossible to set different prefsrc, mtu, window
 280  * and rtt for different paths from multipath.
 281  */
 282
 283 struct rtnexthop
 284 {
 285         unsigned short          rtnh_len;
 286         unsigned char           rtnh_flags;
 287         unsigned char           rtnh_hops;
 288         int                     rtnh_ifindex;
 289 };
 290
 291 /* rtnh_flags */
 292
 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    */
 296
 297 /* Macros to handle hexthops */
 298
 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)))
 307
 308 /* RTM_CACHEINFO */
 309
 310 struct rta_cacheinfo
 311 {
 312         __u32   rta_clntref;
 313         __u32   rta_lastuse;
 314         __s32   rta_expires;
 315         __u32   rta_error;
 316         __u32   rta_used;
 317
 318 #define RTNETLINK_HAVE_PEERINFO 1
 319         __u32   rta_id;
 320         __u32   rta_ts;
 321         __u32   rta_tsage;
 322 };
 323
 324 /* RTM_METRICS --- array of struct rtattr with types of RTAX_* */
 325
 326 enum
 327 {
 328         RTAX_UNSPEC,
 329 #define RTAX_UNSPEC RTAX_UNSPEC
 330         RTAX_LOCK,
 331 #define RTAX_LOCK RTAX_LOCK
 332         RTAX_MTU,
 333 #define RTAX_MTU RTAX_MTU
 334         RTAX_WINDOW,
 335 #define RTAX_WINDOW RTAX_WINDOW
 336         RTAX_RTT,
 337 #define RTAX_RTT RTAX_RTT
 338         RTAX_RTTVAR,
 339 #define RTAX_RTTVAR RTAX_RTTVAR
 340         RTAX_SSTHRESH,
 341 #define RTAX_SSTHRESH RTAX_SSTHRESH
 342         RTAX_CWND,
 343 #define RTAX_CWND RTAX_CWND
 344         RTAX_ADVMSS,
 345 #define RTAX_ADVMSS RTAX_ADVMSS
 346         RTAX_REORDERING,
 347 #define RTAX_REORDERING RTAX_REORDERING
 348         RTAX_HOPLIMIT,
 349 #define RTAX_HOPLIMIT RTAX_HOPLIMIT
 350         RTAX_INITCWND,
 351 #define RTAX_INITCWND RTAX_INITCWND
 352         RTAX_FEATURES,
 353 #define RTAX_FEATURES RTAX_FEATURES
 354         RTAX_RTO_MIN,
 355 #define RTAX_RTO_MIN RTAX_RTO_MIN
 356         __RTAX_MAX
 357 };
 358
 359 #define RTAX_MAX (__RTAX_MAX - 1)
 360
 361 #define RTAX_FEATURE_ECN        0x00000001
 362 #define RTAX_FEATURE_SACK       0x00000002
 363 #define RTAX_FEATURE_TIMESTAMP  0x00000004
 364 #define RTAX_FEATURE_ALLFRAG    0x00000008
 365
 366 struct rta_session
 367 {
 368         __u8    proto;
 369         __u8    pad1;
 370         __u16   pad2;
 371
 372         union {
 373                 struct {
 374                         __u16   sport;
 375                         __u16   dport;
 376                 } ports;
 377
 378                 struct {
 379                         __u8    type;
 380                         __u8    code;
 381                         __u16   ident;
 382                 } icmpt;
 383
 384                 __u32           spi;
 385         } u;
 386 };
 387
 388 /****
 389  *              General form of address family dependent message.
 390  ****/
 391
 392 struct rtgenmsg
 393 {
 394         unsigned char           rtgen_family;
 395 };
 396
 397 /*****************************************************************
 398  *              Link layer specific messages.
 399  ****/
 400
 401 /* struct ifinfomsg
 402  * passes link level specific information, not dependent
 403  * on network protocol.
 404  */
 405
 406 struct ifinfomsg
 407 {
 408         unsigned char   ifi_family;
 409         unsigned char   __ifi_pad;
 410         unsigned short  ifi_type;               /* ARPHRD_* */
 411         int             ifi_index;              /* Link index   */
 412         unsigned        ifi_flags;              /* IFF_* flags  */
 413         unsigned        ifi_change;             /* IFF_* change mask */
 414 };
 415
 416 /********************************************************************
 417  *              prefix information
 418  ****/
 419
 420 struct prefixmsg
 421 {
 422         unsigned char   prefix_family;
 423         unsigned char   prefix_pad1;
 424         unsigned short  prefix_pad2;
 425         int             prefix_ifindex;
 426         unsigned char   prefix_type;
 427         unsigned char   prefix_len;
 428         unsigned char   prefix_flags;
 429         unsigned char   prefix_pad3;
 430 };
 431
 432 enum
 433 {
 434         PREFIX_UNSPEC,
 435         PREFIX_ADDRESS,
 436         PREFIX_CACHEINFO,
 437         __PREFIX_MAX
 438 };
 439
 440 #define PREFIX_MAX      (__PREFIX_MAX - 1)
 441
 442 struct prefix_cacheinfo
 443 {
 444         __u32   preferred_time;
 445         __u32   valid_time;
 446 };
 447
 448
 449 /*****************************************************************
 450  *              Traffic control messages.
 451  ****/
 452
 453 struct tcmsg
 454 {
 455         unsigned char   tcm_family;
 456         unsigned char   tcm__pad1;
 457         unsigned short  tcm__pad2;
 458         int             tcm_ifindex;
 459         __u32           tcm_handle;
 460         __u32           tcm_parent;
 461         __u32           tcm_info;
 462 };
 463
 464 enum
 465 {
 466         TCA_UNSPEC,
 467         TCA_KIND,
 468         TCA_OPTIONS,
 469         TCA_STATS,
 470         TCA_XSTATS,
 471         TCA_RATE,
 472         TCA_FCNT,
 473         TCA_STATS2,
 474         __TCA_MAX
 475 };
 476
 477 #define TCA_MAX (__TCA_MAX - 1)
 478
 479 #define TCA_RTA(r)  ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct tcmsg))))
 480 #define TCA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct tcmsg))
 481
 482 #ifndef __KERNEL__
 483 /* RTnetlink multicast groups - backwards compatibility for userspace */
 484 #define RTMGRP_LINK             1
 485 #define RTMGRP_NOTIFY           2
 486 #define RTMGRP_NEIGH            4
 487 #define RTMGRP_TC               8
 488
 489 #define RTMGRP_IPV4_IFADDR      0x10
 490 #define RTMGRP_IPV4_MROUTE      0x20
 491 #define RTMGRP_IPV4_ROUTE       0x40
 492 #define RTMGRP_IPV4_RULE        0x80
 493
 494 #define RTMGRP_IPV6_IFADDR      0x100
 495 #define RTMGRP_IPV6_MROUTE      0x200
 496 #define RTMGRP_IPV6_ROUTE       0x400
 497 #define RTMGRP_IPV6_IFINFO      0x800
 498
 499 #define RTMGRP_DECnet_IFADDR    0x1000
 500 #define RTMGRP_DECnet_ROUTE     0x4000
 501
 502 #define RTMGRP_IPV6_PREFIX      0x20000
 503 #endif
 504
 505 /* RTnetlink multicast groups */
 506 enum rtnetlink_groups {
 507         RTNLGRP_NONE,
 508 #define RTNLGRP_NONE            RTNLGRP_NONE
 509         RTNLGRP_LINK,
 510 #define RTNLGRP_LINK            RTNLGRP_LINK
 511         RTNLGRP_NOTIFY,
 512 #define RTNLGRP_NOTIFY          RTNLGRP_NOTIFY
 513         RTNLGRP_NEIGH,
 514 #define RTNLGRP_NEIGH           RTNLGRP_NEIGH
 515         RTNLGRP_TC,
 516 #define RTNLGRP_TC              RTNLGRP_TC
 517         RTNLGRP_IPV4_IFADDR,
 518 #define RTNLGRP_IPV4_IFADDR     RTNLGRP_IPV4_IFADDR
 519         RTNLGRP_IPV4_MROUTE,
 520 #define RTNLGRP_IPV4_MROUTE     RTNLGRP_IPV4_MROUTE
 521         RTNLGRP_IPV4_ROUTE,
 522 #define RTNLGRP_IPV4_ROUTE      RTNLGRP_IPV4_ROUTE
 523         RTNLGRP_IPV4_RULE,
 524 #define RTNLGRP_IPV4_RULE       RTNLGRP_IPV4_RULE
 525         RTNLGRP_IPV6_IFADDR,
 526 #define RTNLGRP_IPV6_IFADDR     RTNLGRP_IPV6_IFADDR
 527         RTNLGRP_IPV6_MROUTE,
 528 #define RTNLGRP_IPV6_MROUTE     RTNLGRP_IPV6_MROUTE
 529         RTNLGRP_IPV6_ROUTE,
 530 #define RTNLGRP_IPV6_ROUTE      RTNLGRP_IPV6_ROUTE
 531         RTNLGRP_IPV6_IFINFO,
 532 #define RTNLGRP_IPV6_IFINFO     RTNLGRP_IPV6_IFINFO
 533         RTNLGRP_DECnet_IFADDR,
 534 #define RTNLGRP_DECnet_IFADDR   RTNLGRP_DECnet_IFADDR
 535         RTNLGRP_NOP2,
 536         RTNLGRP_DECnet_ROUTE,
 537 #define RTNLGRP_DECnet_ROUTE    RTNLGRP_DECnet_ROUTE
 538         RTNLGRP_DECnet_RULE,
 539 #define RTNLGRP_DECnet_RULE     RTNLGRP_DECnet_RULE
 540         RTNLGRP_NOP4,
 541         RTNLGRP_IPV6_PREFIX,
 542 #define RTNLGRP_IPV6_PREFIX     RTNLGRP_IPV6_PREFIX
 543         RTNLGRP_IPV6_RULE,
 544 #define RTNLGRP_IPV6_RULE       RTNLGRP_IPV6_RULE
 545         __RTNLGRP_MAX
 546 };
 547 #define RTNLGRP_MAX     (__RTNLGRP_MAX - 1)
 548
 549 /* TC action piece */
 550 struct tcamsg
 551 {
 552         unsigned char   tca_family;
 553         unsigned char   tca__pad1;
 554         unsigned short  tca__pad2;
 555 };
 556 #define TA_RTA(r)  ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct tcamsg))))
 557 #define TA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct tcamsg))
 558 #define TCA_ACT_TAB 1 /* attr type must be >=1 */
 559 #define TCAA_MAX 1
 560
 561 /* End of information exported to user level */
 562
 563 #ifdef __KERNEL__
 564
 565 #include <linux/mutex.h>
 566
 567 extern size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size);
 568 static __inline__ int rtattr_strcmp(const struct rtattr *rta, const char *str)
 569 {
 570         int len = strlen(str) + 1;
 571         return len > rta->rta_len || memcmp(RTA_DATA(rta), str, len);
 572 }
 573
 574 extern int rtattr_parse(struct rtattr *tb[], int maxattr, struct rtattr *rta, int len);
 575 extern int __rtattr_parse_nested_compat(struct rtattr *tb[], int maxattr,
 576                                         struct rtattr *rta, int len);
 577
 578 #define rtattr_parse_nested(tb, max, rta) \
 579         rtattr_parse((tb), (max), RTA_DATA((rta)), RTA_PAYLOAD((rta)))
 580
 581 #define rtattr_parse_nested_compat(tb, max, rta, data, len) \
 582 ({      data = RTA_PAYLOAD(rta) >= len ? RTA_DATA(rta) : NULL; \
 583         __rtattr_parse_nested_compat(tb, max, rta, len); })
 584
 585 extern int rtnetlink_send(struct sk_buff *skb, u32 pid, u32 group, int echo);
 586 extern int rtnl_unicast(struct sk_buff *skb, u32 pid);
 587 extern int rtnl_notify(struct sk_buff *skb, u32 pid, u32 group,
 588                        struct nlmsghdr *nlh, gfp_t flags);
 589 extern void rtnl_set_sk_err(u32 group, int error);
 590 extern int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics);
 591 extern int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst,
 592                               u32 id, u32 ts, u32 tsage, long expires,
 593                               u32 error);
 594
 595 extern void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data);
 596
 597 #define RTA_PUT(skb, attrtype, attrlen, data) \
 598 ({      if (unlikely(skb_tailroom(skb) < (int)RTA_SPACE(attrlen))) \
 599                  goto rtattr_failure; \
 600         __rta_fill(skb, attrtype, attrlen, data); })
 601
 602 #define RTA_APPEND(skb, attrlen, data) \
 603 ({      if (unlikely(skb_tailroom(skb) < (int)(attrlen))) \
 604                 goto rtattr_failure; \
 605         memcpy(skb_put(skb, attrlen), data, attrlen); })
 606
 607 #define RTA_PUT_NOHDR(skb, attrlen, data) \
 608 ({      RTA_APPEND(skb, RTA_ALIGN(attrlen), data); \
 609         memset(skb_tail_pointer(skb) - (RTA_ALIGN(attrlen) - attrlen), 0, \
 610                RTA_ALIGN(attrlen) - attrlen); })
 611
 612 #define RTA_PUT_U8(skb, attrtype, value) \
 613 ({      u8 _tmp = (value); \
 614         RTA_PUT(skb, attrtype, sizeof(u8), &_tmp); })
 615
 616 #define RTA_PUT_U16(skb, attrtype, value) \
 617 ({      u16 _tmp = (value); \
 618         RTA_PUT(skb, attrtype, sizeof(u16), &_tmp); })
 619
 620 #define RTA_PUT_U32(skb, attrtype, value) \
 621 ({      u32 _tmp = (value); \
 622         RTA_PUT(skb, attrtype, sizeof(u32), &_tmp); })
 623
 624 #define RTA_PUT_U64(skb, attrtype, value) \
 625 ({      u64 _tmp = (value); \
 626         RTA_PUT(skb, attrtype, sizeof(u64), &_tmp); })
 627
 628 #define RTA_PUT_SECS(skb, attrtype, value) \
 629         RTA_PUT_U64(skb, attrtype, (value) / HZ)
 630
 631 #define RTA_PUT_MSECS(skb, attrtype, value) \
 632         RTA_PUT_U64(skb, attrtype, jiffies_to_msecs(value))
 633
 634 #define RTA_PUT_STRING(skb, attrtype, value) \
 635         RTA_PUT(skb, attrtype, strlen(value) + 1, value)
 636
 637 #define RTA_PUT_FLAG(skb, attrtype) \
 638         RTA_PUT(skb, attrtype, 0, NULL);
 639
 640 #define RTA_NEST(skb, type) \
 641 ({      struct rtattr *__start = (struct rtattr *)skb_tail_pointer(skb); \
 642         RTA_PUT(skb, type, 0, NULL); \
 643         __start;  })
 644
 645 #define RTA_NEST_END(skb, start) \
 646 ({      (start)->rta_len = skb_tail_pointer(skb) - (unsigned char *)(start); \
 647         (skb)->len; })
 648
 649 #define RTA_NEST_COMPAT(skb, type, attrlen, data) \
 650 ({      struct rtattr *__start = (struct rtattr *)skb_tail_pointer(skb); \
 651         RTA_PUT(skb, type, attrlen, data); \
 652         RTA_NEST(skb, type); \
 653         __start; })
 654
 655 #define RTA_NEST_COMPAT_END(skb, start) \
 656 ({      struct rtattr *__nest = (void *)(start) + NLMSG_ALIGN((start)->rta_len); \
 657         (start)->rta_len = skb_tail_pointer(skb) - (unsigned char *)(start); \
 658         RTA_NEST_END(skb, __nest); \
 659         (skb)->len; })
 660
 661 #define RTA_NEST_CANCEL(skb, start) \
 662 ({      if (start) \
 663                 skb_trim(skb, (unsigned char *) (start) - (skb)->data); \
 664         -1; })
 665
 666 #define RTA_GET_U8(rta) \
 667 ({      if (!rta || RTA_PAYLOAD(rta) < sizeof(u8)) \
 668                 goto rtattr_failure; \
 669         *(u8 *) RTA_DATA(rta); })
 670
 671 #define RTA_GET_U16(rta) \
 672 ({      if (!rta || RTA_PAYLOAD(rta) < sizeof(u16)) \
 673                 goto rtattr_failure; \
 674         *(u16 *) RTA_DATA(rta); })
 675
 676 #define RTA_GET_U32(rta) \
 677 ({      if (!rta || RTA_PAYLOAD(rta) < sizeof(u32)) \
 678                 goto rtattr_failure; \
 679         *(u32 *) RTA_DATA(rta); })
 680
 681 #define RTA_GET_U64(rta) \
 682 ({      u64 _tmp; \
 683         if (!rta || RTA_PAYLOAD(rta) < sizeof(u64)) \
 684                 goto rtattr_failure; \
 685         memcpy(&_tmp, RTA_DATA(rta), sizeof(_tmp)); \
 686         _tmp; })
 687
 688 #define RTA_GET_FLAG(rta) (!!(rta))
 689
 690 #define RTA_GET_SECS(rta) ((unsigned long) RTA_GET_U64(rta) * HZ)
 691 #define RTA_GET_MSECS(rta) (msecs_to_jiffies((unsigned long) RTA_GET_U64(rta)))
 692
 693 static inline struct rtattr *
 694 __rta_reserve(struct sk_buff *skb, int attrtype, int attrlen)
 695 {
 696         struct rtattr *rta;
 697         int size = RTA_LENGTH(attrlen);
 698
 699         rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size));
 700         rta->rta_type = attrtype;
 701         rta->rta_len = size;
 702         memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
 703         return rta;
 704 }
 705
 706 #define __RTA_PUT(skb, attrtype, attrlen) \
 707 ({      if (unlikely(skb_tailroom(skb) < (int)RTA_SPACE(attrlen))) \
 708                 goto rtattr_failure; \
 709         __rta_reserve(skb, attrtype, attrlen); })
 710
 711 extern void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change);
 712
 713 /* RTNL is used as a global lock for all changes to network configuration  */
 714 extern void rtnl_lock(void);
 715 extern void rtnl_unlock(void);
 716 extern int rtnl_trylock(void);
 717
 718 extern void rtnetlink_init(void);
 719 extern void __rtnl_unlock(void);
 720
 721 #define ASSERT_RTNL() do { \
 722         if (unlikely(rtnl_trylock())) { \
 723                 rtnl_unlock(); \
 724                 printk(KERN_ERR "RTNL: assertion failed at %s (%d)\n", \
 725                        __FILE__,  __LINE__); \
 726                 dump_stack(); \
 727         } \
 728 } while(0)
 729
 730 #define BUG_TRAP(x) do { \
 731         if (unlikely(!(x))) { \
 732                 printk(KERN_ERR "KERNEL: assertion (%s) failed at %s (%d)\n", \
 733                         #x,  __FILE__ , __LINE__); \
 734         } \
 735 } while(0)
 736
 737 static inline u32 rtm_get_table(struct rtattr **rta, u8 table)
 738 {
 739         return RTA_GET_U32(rta[RTA_TABLE-1]);
 740 rtattr_failure:
 741         return table;
 742 }
 743
 744 #endif /* __KERNEL__ */
 745
 746
 747 #endif  /* __LINUX_RTNETLINK_H */