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         int                     fd;
  16         struct sockaddr_nl      local;
  17         struct sockaddr_nl      peer;
  18         __u32                   seq;
  19         __u32                   dump;
  20         int                     proto;
  21         FILE                   *dump_fp;
  22 #define RTNL_HANDLE_F_LISTEN_ALL_NSID           0x01
  23         int                     flags;
  24 };
  25
  26 extern int rcvbuf;
  27
  28 int rtnl_open(struct rtnl_handle *rth, unsigned int subscriptions)
  29         __attribute__((warn_unused_result));
  30
  31 int rtnl_open_byproto(struct rtnl_handle *rth, unsigned int subscriptions,
  32                              int protocol)
  33         __attribute__((warn_unused_result));
  34
  35 void rtnl_close(struct rtnl_handle *rth);
  36 int rtnl_wilddump_request(struct rtnl_handle *rth, int fam, int type)
  37         __attribute__((warn_unused_result));
  38 int rtnl_wilddump_req_filter(struct rtnl_handle *rth, int fam, int type,
  39                                     __u32 filt_mask)
  40         __attribute__((warn_unused_result));
  41
  42 typedef int (*req_filter_fn_t)(struct nlmsghdr *nlh, int reqlen);
  43
  44 int rtnl_wilddump_req_filter_fn(struct rtnl_handle *rth, int fam, int type,
  45                                 req_filter_fn_t fn)
  46         __attribute__((warn_unused_result));
  47 int rtnl_dump_request(struct rtnl_handle *rth, int type, void *req,
  48                              int len)
  49         __attribute__((warn_unused_result));
  50 int rtnl_dump_request_n(struct rtnl_handle *rth, struct nlmsghdr *n)
  51         __attribute__((warn_unused_result));
  52
  53 struct rtnl_ctrl_data {
  54         int     nsid;
  55 };
  56
  57 typedef int (*rtnl_filter_t)(const struct sockaddr_nl *,
  58                              struct nlmsghdr *n, void *);
  59
  60 typedef int (*rtnl_listen_filter_t)(const struct sockaddr_nl *,
  61                                     struct rtnl_ctrl_data *,
  62                                     struct nlmsghdr *n, void *);
  63
  64 struct rtnl_dump_filter_arg {
  65         rtnl_filter_t filter;
  66         void *arg1;
  67         __u16 nc_flags;
  68 };
  69
  70 int rtnl_dump_filter_l(struct rtnl_handle *rth,
  71                               const struct rtnl_dump_filter_arg *arg);
  72 int rtnl_dump_filter_nc(struct rtnl_handle *rth,
  73                         rtnl_filter_t filter,
  74                         void *arg, __u16 nc_flags);
  75 #define rtnl_dump_filter(rth, filter, arg) \
  76         rtnl_dump_filter_nc(rth, filter, arg, 0)
  77 int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n,
  78               struct nlmsghdr *answer, size_t len)
  79         __attribute__((warn_unused_result));
  80 int rtnl_send(struct rtnl_handle *rth, const void *buf, int)
  81         __attribute__((warn_unused_result));
  82 int rtnl_send_check(struct rtnl_handle *rth, const void *buf, int)
  83         __attribute__((warn_unused_result));
  84
  85 int addattr(struct nlmsghdr *n, int maxlen, int type);
  86 int addattr8(struct nlmsghdr *n, int maxlen, int type, __u8 data);
  87 int addattr16(struct nlmsghdr *n, int maxlen, int type, __u16 data);
  88 int addattr32(struct nlmsghdr *n, int maxlen, int type, __u32 data);
  89 int addattr64(struct nlmsghdr *n, int maxlen, int type, __u64 data);
  90 int addattrstrz(struct nlmsghdr *n, int maxlen, int type, const char *data);
  91
  92 int addattr_l(struct nlmsghdr *n, int maxlen, int type,
  93               const void *data, int alen);
  94 int addraw_l(struct nlmsghdr *n, int maxlen, const void *data, int len);
  95 struct rtattr *addattr_nest(struct nlmsghdr *n, int maxlen, int type);
  96 int addattr_nest_end(struct nlmsghdr *n, struct rtattr *nest);
  97 struct rtattr *addattr_nest_compat(struct nlmsghdr *n, int maxlen, int type,
  98                                    const void *data, int len);
  99 int addattr_nest_compat_end(struct nlmsghdr *n, struct rtattr *nest);
 100 int rta_addattr8(struct rtattr *rta, int maxlen, int type, __u8 data);
 101 int rta_addattr16(struct rtattr *rta, int maxlen, int type, __u16 data);
 102 int rta_addattr32(struct rtattr *rta, int maxlen, int type, __u32 data);
 103 int rta_addattr64(struct rtattr *rta, int maxlen, int type, __u64 data);
 104 int rta_addattr_l(struct rtattr *rta, int maxlen, int type,
 105                   const void *data, int alen);
 106
 107 int parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta, int len);
 108 int parse_rtattr_flags(struct rtattr *tb[], int max, struct rtattr *rta,
 109                               int len, unsigned short flags);
 110 int parse_rtattr_byindex(struct rtattr *tb[], int max,
 111                          struct rtattr *rta, int len);
 112 struct rtattr *parse_rtattr_one(int type, struct rtattr *rta, int len);
 113 int __parse_rtattr_nested_compat(struct rtattr *tb[], int max, struct rtattr *rta, int len);
 114
 115 struct rtattr *rta_nest(struct rtattr *rta, int maxlen, int type);
 116 int rta_nest_end(struct rtattr *rta, struct rtattr *nest);
 117
 118 #define RTA_TAIL(rta) \
 119                 ((struct rtattr *) (((void *) (rta)) + \
 120                                     RTA_ALIGN((rta)->rta_len)))
 121
 122 #define parse_rtattr_nested(tb, max, rta) \
 123         (parse_rtattr((tb), (max), RTA_DATA(rta), RTA_PAYLOAD(rta)))
 124
 125 #define parse_rtattr_one_nested(type, rta) \
 126         (parse_rtattr_one(type, RTA_DATA(rta), RTA_PAYLOAD(rta)))
 127
 128 #define parse_rtattr_nested_compat(tb, max, rta, data, len) \
 129         ({ data = RTA_PAYLOAD(rta) >= len ? RTA_DATA(rta) : NULL;       \
 130                 __parse_rtattr_nested_compat(tb, max, rta, len); })
 131
 132 static inline __u8 rta_getattr_u8(const struct rtattr *rta)
 133 {
 134         return *(__u8 *)RTA_DATA(rta);
 135 }
 136 static inline __u16 rta_getattr_u16(const struct rtattr *rta)
 137 {
 138         return *(__u16 *)RTA_DATA(rta);
 139 }
 140 static inline __u32 rta_getattr_u32(const struct rtattr *rta)
 141 {
 142         return *(__u32 *)RTA_DATA(rta);
 143 }
 144 static inline __u64 rta_getattr_u64(const struct rtattr *rta)
 145 {
 146         __u64 tmp;
 147
 148         memcpy(&tmp, RTA_DATA(rta), sizeof(__u64));
 149         return tmp;
 150 }
 151 static inline const char *rta_getattr_str(const struct rtattr *rta)
 152 {
 153         return (const char *)RTA_DATA(rta);
 154 }
 155
 156 int rtnl_listen_all_nsid(struct rtnl_handle *);
 157 int rtnl_listen(struct rtnl_handle *, rtnl_listen_filter_t handler,
 158                 void *jarg);
 159 int rtnl_from_file(FILE *, rtnl_listen_filter_t handler,
 160                    void *jarg);
 161
 162 #define NLMSG_TAIL(nmsg) \
 163         ((struct rtattr *) (((void *) (nmsg)) + NLMSG_ALIGN((nmsg)->nlmsg_len)))
 164
 165 #ifndef IFA_RTA
 166 #define IFA_RTA(r) \
 167         ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ifaddrmsg))))
 168 #endif
 169 #ifndef IFA_PAYLOAD
 170 #define IFA_PAYLOAD(n)  NLMSG_PAYLOAD(n, sizeof(struct ifaddrmsg))
 171 #endif
 172
 173 #ifndef IFLA_RTA
 174 #define IFLA_RTA(r) \
 175         ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ifinfomsg))))
 176 #endif
 177 #ifndef IFLA_PAYLOAD
 178 #define IFLA_PAYLOAD(n) NLMSG_PAYLOAD(n, sizeof(struct ifinfomsg))
 179 #endif
 180
 181 #ifndef NDA_RTA
 182 #define NDA_RTA(r) \
 183         ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ndmsg))))
 184 #endif
 185 #ifndef NDA_PAYLOAD
 186 #define NDA_PAYLOAD(n)  NLMSG_PAYLOAD(n, sizeof(struct ndmsg))
 187 #endif
 188
 189 #ifndef NDTA_RTA
 190 #define NDTA_RTA(r) \
 191         ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ndtmsg))))
 192 #endif
 193 #ifndef NDTA_PAYLOAD
 194 #define NDTA_PAYLOAD(n) NLMSG_PAYLOAD(n, sizeof(struct ndtmsg))
 195 #endif
 196
 197 #ifndef NETNS_RTA
 198 #define NETNS_RTA(r) \
 199         ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct rtgenmsg))))
 200 #endif
 201 #ifndef NETNS_PAYLOAD
 202 #define NETNS_PAYLOAD(n)        NLMSG_PAYLOAD(n, sizeof(struct rtgenmsg))
 203 #endif
 204
 205 /* User defined nlmsg_type which is used mostly for logging netlink
 206  * messages from dump file */
 207 #define NLMSG_TSTAMP    15
 208
 209 #endif /* __LIBNETLINK_H__ */