pimd/mtracebis_netlink.h

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * libnetlink.c RTnetlink service routines.
   4  *
   5  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
   6  *
   7  */
   8
   9 #ifdef __linux__
  10
  11 #ifndef __LIBNETLINK_H__
  12 #define __LIBNETLINK_H__ 1
  13
  14 #include <asm/types.h>
  15 #include <linux/netlink.h>
  16 #include <linux/rtnetlink.h>
  17 #include <linux/if_link.h>
  18 #include <linux/if_addr.h>
  19 #include <linux/neighbour.h>
  20
  21 struct rtnl_handle {
  22         int fd;
  23         struct sockaddr_nl local;
  24         struct sockaddr_nl peer;
  25         __u32 seq;
  26         __u32 dump;
  27 };
  28
  29 extern int rcvbuf;
  30
  31 extern int rtnl_open(struct rtnl_handle *rth, unsigned subscriptions);
  32 extern int rtnl_open_byproto(struct rtnl_handle *rth, unsigned subscriptions,
  33                              int protocol);
  34 extern void rtnl_close(struct rtnl_handle *rth);
  35 extern int rtnl_wilddump_request(struct rtnl_handle *rth, int fam, int type);
  36 extern int rtnl_dump_request(struct rtnl_handle *rth, int type, void *req,
  37                              int len);
  38
  39 typedef int (*rtnl_filter_t)(const struct sockaddr_nl *, struct nlmsghdr *n,
  40                              void *);
  41
  42 struct rtnl_dump_filter_arg {
  43         rtnl_filter_t filter;
  44         void *arg1;
  45         rtnl_filter_t junk;
  46         void *arg2;
  47 };
  48
  49 extern int rtnl_dump_filter_l(struct rtnl_handle *rth,
  50                               const struct rtnl_dump_filter_arg *arg);
  51 extern int rtnl_dump_filter(struct rtnl_handle *rth, rtnl_filter_t filter,
  52                             void *arg1, rtnl_filter_t junk, void *arg2);
  53
  54 extern int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n, pid_t peer,
  55                      unsigned groups, struct nlmsghdr *answer,
  56                      rtnl_filter_t junk, void *jarg);
  57 extern int rtnl_send(struct rtnl_handle *rth, const char *buf, int);
  58 extern int rtnl_send_check(struct rtnl_handle *rth, const char *buf, int);
  59
  60 extern int addattr32(struct nlmsghdr *n, int maxlen, int type, __u32 data);
  61 extern int addattr_l(struct nlmsghdr *n, int maxlen, int type, const void *data,
  62                      int alen);
  63 extern int addraw_l(struct nlmsghdr *n, int maxlen, const void *data, int len);
  64 extern struct rtattr *addattr_nest(struct nlmsghdr *n, int maxlen, int type);
  65 extern int addattr_nest_end(struct nlmsghdr *n, struct rtattr *nest);
  66 extern struct rtattr *addattr_nest_compat(struct nlmsghdr *n, int maxlen,
  67                                           int type, const void *data, int len);
  68 extern int addattr_nest_compat_end(struct nlmsghdr *n, struct rtattr *nest);
  69 extern int rta_addattr32(struct rtattr *rta, int maxlen, int type, __u32 data);
  70 extern int rta_addattr_l(struct rtattr *rta, int maxlen, int type,
  71                          const void *data, int alen);
  72
  73 extern int parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta,
  74                         int len);
  75 extern int parse_rtattr_byindex(struct rtattr *tb[], int max,
  76                                 struct rtattr *rta, int len);
  77 extern int __parse_rtattr_nested_compat(struct rtattr *tb[], int max,
  78                                         struct rtattr *rta, int len);
  79
  80 #define parse_rtattr_nested(tb, max, rta)                                      \
  81         (parse_rtattr((tb), (max), RTA_DATA(rta), RTA_PAYLOAD(rta)))
  82
  83 #define parse_rtattr_nested_compat(tb, max, rta, data, len)                    \
  84         ({                                                                     \
  85                 data = RTA_PAYLOAD(rta) >= len ? RTA_DATA(rta) : NULL;         \
  86                 __parse_rtattr_nested_compat(tb, max, rta, len);               \
  87         })
  88
  89 extern int rtnl_listen(struct rtnl_handle *, rtnl_filter_t handler, void *jarg);
  90 extern int rtnl_from_file(FILE *, rtnl_filter_t handler, void *jarg);
  91
  92 #define NLMSG_TAIL(nmsg)                                                       \
  93         ((struct rtattr *)(((uint8_t *)(nmsg))                                 \
  94                            + NLMSG_ALIGN((nmsg)->nlmsg_len)))
  95
  96 #ifndef IFA_RTA
  97 #define IFA_RTA(r)                                                             \
  98         ((struct rtattr *)(((char *)(r))                                       \
  99                            + NLMSG_ALIGN(sizeof(struct ifaddrmsg))))
 100 #endif
 101 #ifndef IFA_PAYLOAD
 102 #define IFA_PAYLOAD(n)  NLMSG_PAYLOAD(n,sizeof(struct ifaddrmsg))
 103 #endif
 104
 105 #ifndef IFLA_RTA
 106 #define IFLA_RTA(r)                                                            \
 107         ((struct rtattr *)(((char *)(r))                                       \
 108                            + NLMSG_ALIGN(sizeof(struct ifinfomsg))))
 109 #endif
 110 #ifndef IFLA_PAYLOAD
 111 #define IFLA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct ifinfomsg))
 112 #endif
 113
 114 #ifndef NDA_RTA
 115 #define NDA_RTA(r)                                                             \
 116         ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ndmsg))))
 117 #endif
 118 #ifndef NDA_PAYLOAD
 119 #define NDA_PAYLOAD(n)  NLMSG_PAYLOAD(n,sizeof(struct ndmsg))
 120 #endif
 121
 122 #ifndef NDTA_RTA
 123 #define NDTA_RTA(r)                                                            \
 124         ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ndtmsg))))
 125 #endif
 126 #ifndef NDTA_PAYLOAD
 127 #define NDTA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct ndtmsg))
 128 #endif
 129
 130 #endif /* __LIBNETLINK_H__ */
 131
 132 #endif /* __linux__ */