include/libnetlink.h

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