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         int                     proto;
  22 };
  23
  24 extern int rcvbuf;
  25
  26 extern int rtnl_open(struct rtnl_handle *rth, unsigned subscriptions)
  27         __attribute__((warn_unused_result));
  28
  29 extern int rtnl_open_byproto(struct rtnl_handle *rth, unsigned subscriptions,
  30                              int protocol)
  31         __attribute__((warn_unused_result));
  32
  33 extern void rtnl_close(struct rtnl_handle *rth);
  34 extern int rtnl_wilddump_request(struct rtnl_handle *rth, int fam, int type)
  35         __attribute__((warn_unused_result));
  36 extern int rtnl_wilddump_req_filter(struct rtnl_handle *rth, int fam, int type,
  37                                     __u32 filt_mask)
  38         __attribute__((warn_unused_result));
  39 extern int rtnl_dump_request(struct rtnl_handle *rth, int type, void *req,
  40                              int len)
  41         __attribute__((warn_unused_result));
  42
  43 typedef int (*rtnl_filter_t)(const struct sockaddr_nl *,
  44                              struct nlmsghdr *n, void *);
  45
  46 struct rtnl_dump_filter_arg
  47 {
  48         rtnl_filter_t filter;
  49         void *arg1;
  50 };
  51
  52 extern int rtnl_dump_filter_l(struct rtnl_handle *rth,
  53                               const struct rtnl_dump_filter_arg *arg);
  54 extern int rtnl_dump_filter(struct rtnl_handle *rth, rtnl_filter_t filter,
  55                             void *arg);
  56 extern int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n, pid_t peer,
  57                      unsigned groups, struct nlmsghdr *answer)
  58         __attribute__((warn_unused_result));
  59 extern int rtnl_send(struct rtnl_handle *rth, const void *buf, int)
  60         __attribute__((warn_unused_result));
  61 extern int rtnl_send_check(struct rtnl_handle *rth, const void *buf, int)
  62         __attribute__((warn_unused_result));
  63
  64 extern int addattr(struct nlmsghdr *n, int maxlen, int type);
  65 extern int addattr8(struct nlmsghdr *n, int maxlen, int type, __u8 data);
  66 extern int addattr16(struct nlmsghdr *n, int maxlen, int type, __u16 data);
  67 extern int addattr32(struct nlmsghdr *n, int maxlen, int type, __u32 data);
  68 extern int addattr64(struct nlmsghdr *n, int maxlen, int type, __u64 data);
  69 extern int addattrstrz(struct nlmsghdr *n, int maxlen, int type, const char *data);
  70
  71 extern int addattr_l(struct nlmsghdr *n, int maxlen, int type, const void *data, int alen);
  72 extern int addraw_l(struct nlmsghdr *n, int maxlen, const void *data, int len);
  73 extern struct rtattr *addattr_nest(struct nlmsghdr *n, int maxlen, int type);
  74 extern int addattr_nest_end(struct nlmsghdr *n, struct rtattr *nest);
  75 extern struct rtattr *addattr_nest_compat(struct nlmsghdr *n, int maxlen, int type, const void *data, int len);
  76 extern int addattr_nest_compat_end(struct nlmsghdr *n, struct rtattr *nest);
  77 extern int rta_addattr32(struct rtattr *rta, int maxlen, int type, __u32 data);
  78 extern int rta_addattr_l(struct rtattr *rta, int maxlen, int type, const void *data, int alen);
  79
  80 extern int parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta, int len);
  81 extern int parse_rtattr_flags(struct rtattr *tb[], int max, struct rtattr *rta,
  82                               int len, unsigned short flags);
  83 extern int parse_rtattr_byindex(struct rtattr *tb[], int max, struct rtattr *rta, int len);
  84 extern int __parse_rtattr_nested_compat(struct rtattr *tb[], int max, struct rtattr *rta, int len);
  85
  86 #define parse_rtattr_nested(tb, max, rta) \
  87         (parse_rtattr((tb), (max), RTA_DATA(rta), RTA_PAYLOAD(rta)))
  88
  89 #define parse_rtattr_nested_compat(tb, max, rta, data, len) \
  90         ({ data = RTA_PAYLOAD(rta) >= len ? RTA_DATA(rta) : NULL;       \
  91                 __parse_rtattr_nested_compat(tb, max, rta, len); })
  92
  93 static inline __u8 rta_getattr_u8(const struct rtattr *rta)
  94 {
  95         return *(__u8 *)RTA_DATA(rta);
  96 }
  97 static inline __u16 rta_getattr_u16(const struct rtattr *rta)
  98 {
  99         return *(__u16 *)RTA_DATA(rta);
 100 }
 101 static inline __u32 rta_getattr_u32(const struct rtattr *rta)
 102 {
 103         return *(__u32 *)RTA_DATA(rta);
 104 }
 105 static inline __u64 rta_getattr_u64(const struct rtattr *rta)
 106 {
 107         __u64 tmp;
 108         memcpy(&tmp, RTA_DATA(rta), sizeof(__u64));
 109         return tmp;
 110 }
 111 static inline const char *rta_getattr_str(const struct rtattr *rta)
 112 {
 113         return (const char *)RTA_DATA(rta);
 114 }
 115
 116 extern int rtnl_listen(struct rtnl_handle *, rtnl_filter_t handler,
 117                        void *jarg);
 118 extern int rtnl_from_file(FILE *, rtnl_filter_t handler,
 119                        void *jarg);
 120
 121 #define NLMSG_TAIL(nmsg) \
 122         ((struct rtattr *) (((void *) (nmsg)) + NLMSG_ALIGN((nmsg)->nlmsg_len)))
 123
 124 #ifndef IFA_RTA
 125 #define IFA_RTA(r) \
 126         ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ifaddrmsg))))
 127 #endif
 128 #ifndef IFA_PAYLOAD
 129 #define IFA_PAYLOAD(n)  NLMSG_PAYLOAD(n,sizeof(struct ifaddrmsg))
 130 #endif
 131
 132 #ifndef IFLA_RTA
 133 #define IFLA_RTA(r) \
 134         ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ifinfomsg))))
 135 #endif
 136 #ifndef IFLA_PAYLOAD
 137 #define IFLA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct ifinfomsg))
 138 #endif
 139
 140 #ifndef NDA_RTA
 141 #define NDA_RTA(r) \
 142         ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ndmsg))))
 143 #endif
 144 #ifndef NDA_PAYLOAD
 145 #define NDA_PAYLOAD(n)  NLMSG_PAYLOAD(n,sizeof(struct ndmsg))
 146 #endif
 147
 148 #ifndef NDTA_RTA
 149 #define NDTA_RTA(r) \
 150         ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ndtmsg))))
 151 #endif
 152 #ifndef NDTA_PAYLOAD
 153 #define NDTA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct ndtmsg))
 154 #endif
 155
 156 #endif /* __LIBNETLINK_H__ */
 157