include/libnetlink.h

   1 #ifndef __LIBNETLINK_H__
   2 #define __LIBNETLINK_H__ 1
   3
   4 #include <stdio.h>
   5 #include <string.h>
   6 #include <asm/types.h>
   7 #include <linux/netlink.h>
   8 #include <linux/rtnetlink.h>
   9 #include <linux/if_link.h>
  10 #include <linux/if_addr.h>
  11 #include <linux/neighbour.h>
  12 #include <linux/netconf.h>
  13
  14 struct rtnl_handle
  15 {
  16         int                     fd;
  17         struct sockaddr_nl      local;
  18         struct sockaddr_nl      peer;
  19         __u32                   seq;
  20         __u32                   dump;
  21 };
  22
  23 extern int rcvbuf;
  24
  25 extern int rtnl_open(struct rtnl_handle *rth, unsigned subscriptions);
  26 extern int rtnl_open_byproto(struct rtnl_handle *rth, unsigned subscriptions, int protocol);
  27 extern void rtnl_close(struct rtnl_handle *rth);
  28 extern int rtnl_wilddump_request(struct rtnl_handle *rth, int fam, int type);
  29 extern int rtnl_dump_request(struct rtnl_handle *rth, int type, void *req, int len);
  30
  31 typedef int (*rtnl_filter_t)(const struct sockaddr_nl *,
  32                              struct nlmsghdr *n, void *);
  33
  34 struct rtnl_dump_filter_arg
  35 {
  36         rtnl_filter_t filter;
  37         void *arg1;
  38 };
  39
  40 extern int rtnl_dump_filter_l(struct rtnl_handle *rth,
  41                               const struct rtnl_dump_filter_arg *arg);
  42 extern int rtnl_dump_filter(struct rtnl_handle *rth, rtnl_filter_t filter,
  43                             void *arg);
  44 extern int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n, pid_t peer,
  45                      unsigned groups, struct nlmsghdr *answer);
  46 extern int rtnl_send(struct rtnl_handle *rth, const void *buf, int);
  47 extern int rtnl_send_check(struct rtnl_handle *rth, const void *buf, int);
  48
  49 extern int addattr(struct nlmsghdr *n, int maxlen, int type);
  50 extern int addattr8(struct nlmsghdr *n, int maxlen, int type, __u8 data);
  51 extern int addattr16(struct nlmsghdr *n, int maxlen, int type, __u16 data);
  52 extern int addattr32(struct nlmsghdr *n, int maxlen, int type, __u32 data);
  53 extern int addattr64(struct nlmsghdr *n, int maxlen, int type, __u64 data);
  54 extern int addattrstrz(struct nlmsghdr *n, int maxlen, int type, const char *data);
  55
  56 extern int addattr_l(struct nlmsghdr *n, int maxlen, int type, const void *data, int alen);
  57 extern int addraw_l(struct nlmsghdr *n, int maxlen, const void *data, int len);
  58 extern struct rtattr *addattr_nest(struct nlmsghdr *n, int maxlen, int type);
  59 extern int addattr_nest_end(struct nlmsghdr *n, struct rtattr *nest);
  60 extern struct rtattr *addattr_nest_compat(struct nlmsghdr *n, int maxlen, int type, const void *data, int len);
  61 extern int addattr_nest_compat_end(struct nlmsghdr *n, struct rtattr *nest);
  62 extern int rta_addattr32(struct rtattr *rta, int maxlen, int type, __u32 data);
  63 extern int rta_addattr_l(struct rtattr *rta, int maxlen, int type, const void *data, int alen);
  64
  65 extern int parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta, int len);
  66 extern int parse_rtattr_byindex(struct rtattr *tb[], int max, struct rtattr *rta, int len);
  67 extern int __parse_rtattr_nested_compat(struct rtattr *tb[], int max, struct rtattr *rta, int len);
  68
  69 #define parse_rtattr_nested(tb, max, rta) \
  70         (parse_rtattr((tb), (max), RTA_DATA(rta), RTA_PAYLOAD(rta)))
  71
  72 #define parse_rtattr_nested_compat(tb, max, rta, data, len) \
  73         ({ data = RTA_PAYLOAD(rta) >= len ? RTA_DATA(rta) : NULL;       \
  74                 __parse_rtattr_nested_compat(tb, max, rta, len); })
  75
  76 static inline __u8 rta_getattr_u8(const struct rtattr *rta)
  77 {
  78         return *(__u8 *)RTA_DATA(rta);
  79 }
  80 static inline __u16 rta_getattr_u16(const struct rtattr *rta)
  81 {
  82         return *(__u16 *)RTA_DATA(rta);
  83 }
  84 static inline __u32 rta_getattr_u32(const struct rtattr *rta)
  85 {
  86         return *(__u32 *)RTA_DATA(rta);
  87 }
  88 static inline __u64 rta_getattr_u64(const struct rtattr *rta)
  89 {
  90         __u64 tmp;
  91         memcpy(&tmp, RTA_DATA(rta), sizeof(__u64));
  92         return tmp;
  93 }
  94 static inline const char *rta_getattr_str(const struct rtattr *rta)
  95 {
  96         return (const char *)RTA_DATA(rta);
  97 }
  98
  99 extern int rtnl_listen(struct rtnl_handle *, rtnl_filter_t handler,
 100                        void *jarg);
 101 extern int rtnl_from_file(FILE *, rtnl_filter_t handler,
 102                        void *jarg);
 103
 104 #define NLMSG_TAIL(nmsg) \
 105         ((struct rtattr *) (((void *) (nmsg)) + NLMSG_ALIGN((nmsg)->nlmsg_len)))
 106
 107 #ifndef IFA_RTA
 108 #define IFA_RTA(r) \
 109         ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ifaddrmsg))))
 110 #endif
 111 #ifndef IFA_PAYLOAD
 112 #define IFA_PAYLOAD(n)  NLMSG_PAYLOAD(n,sizeof(struct ifaddrmsg))
 113 #endif
 114
 115 #ifndef IFLA_RTA
 116 #define IFLA_RTA(r) \
 117         ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ifinfomsg))))
 118 #endif
 119 #ifndef IFLA_PAYLOAD
 120 #define IFLA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct ifinfomsg))
 121 #endif
 122
 123 #ifndef NDA_RTA
 124 #define NDA_RTA(r) \
 125         ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ndmsg))))
 126 #endif
 127 #ifndef NDA_PAYLOAD
 128 #define NDA_PAYLOAD(n)  NLMSG_PAYLOAD(n,sizeof(struct ndmsg))
 129 #endif
 130
 131 #ifndef NDTA_RTA
 132 #define NDTA_RTA(r) \
 133         ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ndtmsg))))
 134 #endif
 135 #ifndef NDTA_PAYLOAD
 136 #define NDTA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct ndtmsg))
 137 #endif
 138
 139 #endif /* __LIBNETLINK_H__ */
 140