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         FILE                   *dump_fp;
  23 #define RTNL_HANDLE_F_LISTEN_ALL_NSID           0x01
  24         int                     flags;
  25 };
  26
  27 extern int rcvbuf;
  28
  29 int rtnl_open(struct rtnl_handle *rth, unsigned subscriptions)
  30         __attribute__((warn_unused_result));
  31
  32 int rtnl_open_byproto(struct rtnl_handle *rth, unsigned subscriptions,
  33                              int protocol)
  34         __attribute__((warn_unused_result));
  35
  36 void rtnl_close(struct rtnl_handle *rth);
  37 int rtnl_wilddump_request(struct rtnl_handle *rth, int fam, int type)
  38         __attribute__((warn_unused_result));
  39 int rtnl_wilddump_req_filter(struct rtnl_handle *rth, int fam, int type,
  40                                     __u32 filt_mask)
  41         __attribute__((warn_unused_result));
  42 int rtnl_dump_request(struct rtnl_handle *rth, int type, void *req,
  43                              int len)
  44         __attribute__((warn_unused_result));
  45
  46 struct rtnl_ctrl_data {
  47         int     nsid;
  48 };
  49
  50 typedef int (*rtnl_filter_t)(const struct sockaddr_nl *,
  51                              struct nlmsghdr *n, void *);
  52
  53 typedef int (*rtnl_listen_filter_t)(const struct sockaddr_nl *,
  54                                     struct rtnl_ctrl_data *,
  55                                     struct nlmsghdr *n, void *);
  56
  57 struct rtnl_dump_filter_arg
  58 {
  59         rtnl_filter_t filter;
  60         void *arg1;
  61 };
  62
  63 int rtnl_dump_filter_l(struct rtnl_handle *rth,
  64                               const struct rtnl_dump_filter_arg *arg);
  65 int rtnl_dump_filter(struct rtnl_handle *rth, rtnl_filter_t filter, void *arg);
  66 int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n,
  67               struct nlmsghdr *answer, size_t len)
  68         __attribute__((warn_unused_result));
  69 int rtnl_send(struct rtnl_handle *rth, const void *buf, int)
  70         __attribute__((warn_unused_result));
  71 int rtnl_send_check(struct rtnl_handle *rth, const void *buf, int)
  72         __attribute__((warn_unused_result));
  73
  74 int addattr(struct nlmsghdr *n, int maxlen, int type);
  75 int addattr8(struct nlmsghdr *n, int maxlen, int type, __u8 data);
  76 int addattr16(struct nlmsghdr *n, int maxlen, int type, __u16 data);
  77 int addattr32(struct nlmsghdr *n, int maxlen, int type, __u32 data);
  78 int addattr64(struct nlmsghdr *n, int maxlen, int type, __u64 data);
  79 int addattrstrz(struct nlmsghdr *n, int maxlen, int type, const char *data);
  80
  81 int addattr_l(struct nlmsghdr *n, int maxlen, int type,
  82               const void *data, int alen);
  83 int addraw_l(struct nlmsghdr *n, int maxlen, const void *data, int len);
  84 struct rtattr *addattr_nest(struct nlmsghdr *n, int maxlen, int type);
  85 int addattr_nest_end(struct nlmsghdr *n, struct rtattr *nest);
  86 struct rtattr *addattr_nest_compat(struct nlmsghdr *n, int maxlen, int type,
  87                                    const void *data, int len);
  88 int addattr_nest_compat_end(struct nlmsghdr *n, struct rtattr *nest);
  89 int rta_addattr32(struct rtattr *rta, int maxlen, int type, __u32 data);
  90 int rta_addattr_l(struct rtattr *rta, int maxlen, int type,
  91                   const void *data, int alen);
  92
  93 int parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta, int len);
  94 int parse_rtattr_flags(struct rtattr *tb[], int max, struct rtattr *rta,
  95                               int len, unsigned short flags);
  96 int parse_rtattr_byindex(struct rtattr *tb[], int max,
  97                          struct rtattr *rta, int len);
  98 struct rtattr *parse_rtattr_one(int type, struct rtattr *rta, int len);
  99 int __parse_rtattr_nested_compat(struct rtattr *tb[], int max, struct rtattr *rta, int len);
 100
 101 #define parse_rtattr_nested(tb, max, rta) \
 102         (parse_rtattr((tb), (max), RTA_DATA(rta), RTA_PAYLOAD(rta)))
 103
 104 #define parse_rtattr_one_nested(type, rta) \
 105         (parse_rtattr_one(type, RTA_DATA(rta), RTA_PAYLOAD(rta)))
 106
 107 #define parse_rtattr_nested_compat(tb, max, rta, data, len) \
 108         ({ data = RTA_PAYLOAD(rta) >= len ? RTA_DATA(rta) : NULL;       \
 109                 __parse_rtattr_nested_compat(tb, max, rta, len); })
 110
 111 static inline __u8 rta_getattr_u8(const struct rtattr *rta)
 112 {
 113         return *(__u8 *)RTA_DATA(rta);
 114 }
 115 static inline __u16 rta_getattr_u16(const struct rtattr *rta)
 116 {
 117         return *(__u16 *)RTA_DATA(rta);
 118 }
 119 static inline __u32 rta_getattr_u32(const struct rtattr *rta)
 120 {
 121         return *(__u32 *)RTA_DATA(rta);
 122 }
 123 static inline __u64 rta_getattr_u64(const struct rtattr *rta)
 124 {
 125         __u64 tmp;
 126         memcpy(&tmp, RTA_DATA(rta), sizeof(__u64));
 127         return tmp;
 128 }
 129 static inline const char *rta_getattr_str(const struct rtattr *rta)
 130 {
 131         return (const char *)RTA_DATA(rta);
 132 }
 133
 134 int rtnl_listen_all_nsid(struct rtnl_handle *);
 135 int rtnl_listen(struct rtnl_handle *, rtnl_listen_filter_t handler,
 136                 void *jarg);
 137 int rtnl_from_file(FILE *, rtnl_listen_filter_t handler,
 138                    void *jarg);
 139
 140 #define NLMSG_TAIL(nmsg) \
 141         ((struct rtattr *) (((void *) (nmsg)) + NLMSG_ALIGN((nmsg)->nlmsg_len)))
 142
 143 #ifndef IFA_RTA
 144 #define IFA_RTA(r) \
 145         ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ifaddrmsg))))
 146 #endif
 147 #ifndef IFA_PAYLOAD
 148 #define IFA_PAYLOAD(n)  NLMSG_PAYLOAD(n,sizeof(struct ifaddrmsg))
 149 #endif
 150
 151 #ifndef IFLA_RTA
 152 #define IFLA_RTA(r) \
 153         ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ifinfomsg))))
 154 #endif
 155 #ifndef IFLA_PAYLOAD
 156 #define IFLA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct ifinfomsg))
 157 #endif
 158
 159 #ifndef NDA_RTA
 160 #define NDA_RTA(r) \
 161         ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ndmsg))))
 162 #endif
 163 #ifndef NDA_PAYLOAD
 164 #define NDA_PAYLOAD(n)  NLMSG_PAYLOAD(n,sizeof(struct ndmsg))
 165 #endif
 166
 167 #ifndef NDTA_RTA
 168 #define NDTA_RTA(r) \
 169         ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ndtmsg))))
 170 #endif
 171 #ifndef NDTA_PAYLOAD
 172 #define NDTA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct ndtmsg))
 173 #endif
 174
 175 #ifndef NETNS_RTA
 176 #define NETNS_RTA(r) \
 177         ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct rtgenmsg))))
 178 #endif
 179 #ifndef NETNS_PAYLOAD
 180 #define NETNS_PAYLOAD(n)        NLMSG_PAYLOAD(n,sizeof(struct rtgenmsg))
 181 #endif
 182
 183 /* User defined nlmsg_type which is used mostly for logging netlink
 184  * messages from dump file */
 185 #define NLMSG_TSTAMP    15
 186
 187 #endif /* __LIBNETLINK_H__ */
 188