pimd/mtracebis_netlink.h

   1 /*
   2  * libnetlink.c RTnetlink service routines.
   3  *
   4  *              This program is free software; you can redistribute it and/or
   5  *              modify it under the terms of the GNU General Public License
   6  *              as published by the Free Software Foundation; either version
   7  *              2 of the License, or (at your option) any later version.
   8  *
   9  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  10  *
  11  */
  12
  13 #ifdef __linux__
  14
  15 #ifndef __LIBNETLINK_H__
  16 #define __LIBNETLINK_H__ 1
  17
  18 #include <asm/types.h>
  19 #include <linux/netlink.h>
  20 #include <linux/rtnetlink.h>
  21 #include <linux/if_link.h>
  22 #include <linux/if_addr.h>
  23 #include <linux/neighbour.h>
  24
  25 struct rtnl_handle {
  26         int fd;
  27         struct sockaddr_nl local;
  28         struct sockaddr_nl peer;
  29         __u32 seq;
  30         __u32 dump;
  31 };
  32
  33 extern int rcvbuf;
  34
  35 extern int rtnl_open(struct rtnl_handle *rth, unsigned subscriptions);
  36 extern int rtnl_open_byproto(struct rtnl_handle *rth, unsigned subscriptions,
  37                              int protocol);
  38 extern void rtnl_close(struct rtnl_handle *rth);
  39 extern int rtnl_wilddump_request(struct rtnl_handle *rth, int fam, int type);
  40 extern int rtnl_dump_request(struct rtnl_handle *rth, int type, void *req,
  41                              int len);
  42
  43 typedef int (*rtnl_filter_t)(const struct sockaddr_nl *, struct nlmsghdr *n,
  44                              void *);
  45
  46 struct rtnl_dump_filter_arg {
  47         rtnl_filter_t filter;
  48         void *arg1;
  49         rtnl_filter_t junk;
  50         void *arg2;
  51 };
  52
  53 extern int rtnl_dump_filter_l(struct rtnl_handle *rth,
  54                               const struct rtnl_dump_filter_arg *arg);
  55 extern int rtnl_dump_filter(struct rtnl_handle *rth, rtnl_filter_t filter,
  56                             void *arg1, rtnl_filter_t junk, void *arg2);
  57
  58 extern int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n, pid_t peer,
  59                      unsigned groups, struct nlmsghdr *answer,
  60                      rtnl_filter_t junk, void *jarg);
  61 extern int rtnl_send(struct rtnl_handle *rth, const char *buf, int);
  62 extern int rtnl_send_check(struct rtnl_handle *rth, const char *buf, int);
  63
  64 extern int addattr32(struct nlmsghdr *n, int maxlen, int type, __u32 data);
  65 extern int addattr_l(struct nlmsghdr *n, int maxlen, int type, const void *data,
  66                      int alen);
  67 extern int addraw_l(struct nlmsghdr *n, int maxlen, const void *data, int len);
  68 extern struct rtattr *addattr_nest(struct nlmsghdr *n, int maxlen, int type);
  69 extern int addattr_nest_end(struct nlmsghdr *n, struct rtattr *nest);
  70 extern struct rtattr *addattr_nest_compat(struct nlmsghdr *n, int maxlen,
  71                                           int type, const void *data, int len);
  72 extern int addattr_nest_compat_end(struct nlmsghdr *n, struct rtattr *nest);
  73 extern int rta_addattr32(struct rtattr *rta, int maxlen, int type, __u32 data);
  74 extern int rta_addattr_l(struct rtattr *rta, int maxlen, int type,
  75                          const void *data, int alen);
  76
  77 extern int parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta,
  78                         int len);
  79 extern int parse_rtattr_byindex(struct rtattr *tb[], int max,
  80                                 struct rtattr *rta, int len);
  81 extern int __parse_rtattr_nested_compat(struct rtattr *tb[], int max,
  82                                         struct rtattr *rta, int len);
  83
  84 #define parse_rtattr_nested(tb, max, rta)                                      \
  85         (parse_rtattr((tb), (max), RTA_DATA(rta), RTA_PAYLOAD(rta)))
  86
  87 #define parse_rtattr_nested_compat(tb, max, rta, data, len)                    \
  88         ({                                                                     \
  89                 data = RTA_PAYLOAD(rta) >= len ? RTA_DATA(rta) : NULL;         \
  90                 __parse_rtattr_nested_compat(tb, max, rta, len);               \
  91         })
  92
  93 extern int rtnl_listen(struct rtnl_handle *, rtnl_filter_t handler, void *jarg);
  94 extern int rtnl_from_file(FILE *, rtnl_filter_t handler, void *jarg);
  95
  96 #define NLMSG_TAIL(nmsg)                                                       \
  97         ((struct rtattr *)(((uint8_t *)(nmsg))                                 \
  98                            + NLMSG_ALIGN((nmsg)->nlmsg_len)))
  99
 100 #ifndef IFA_RTA
 101 #define IFA_RTA(r)                                                             \
 102         ((struct rtattr *)(((char *)(r))                                       \
 103                            + NLMSG_ALIGN(sizeof(struct ifaddrmsg))))
 104 #endif
 105 #ifndef IFA_PAYLOAD
 106 #define IFA_PAYLOAD(n)  NLMSG_PAYLOAD(n,sizeof(struct ifaddrmsg))
 107 #endif
 108
 109 #ifndef IFLA_RTA
 110 #define IFLA_RTA(r)                                                            \
 111         ((struct rtattr *)(((char *)(r))                                       \
 112                            + NLMSG_ALIGN(sizeof(struct ifinfomsg))))
 113 #endif
 114 #ifndef IFLA_PAYLOAD
 115 #define IFLA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct ifinfomsg))
 116 #endif
 117
 118 #ifndef NDA_RTA
 119 #define NDA_RTA(r)                                                             \
 120         ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ndmsg))))
 121 #endif
 122 #ifndef NDA_PAYLOAD
 123 #define NDA_PAYLOAD(n)  NLMSG_PAYLOAD(n,sizeof(struct ndmsg))
 124 #endif
 125
 126 #ifndef NDTA_RTA
 127 #define NDTA_RTA(r)                                                            \
 128         ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ndtmsg))))
 129 #endif
 130 #ifndef NDTA_PAYLOAD
 131 #define NDTA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct ndtmsg))
 132 #endif
 133
 134 #endif /* __LIBNETLINK_H__ */
 135
 136 #endif /* __linux__ */