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_wilddump_stats_req_filter(struct rtnl_handle *rth, int fam, int type,
  48                                    __u32 filt_mask)
  49         __attribute__((warn_unused_result));
  50 int rtnl_dump_request(struct rtnl_handle *rth, int type, void *req,
  51                              int len)
  52         __attribute__((warn_unused_result));
  53 int rtnl_dump_request_n(struct rtnl_handle *rth, struct nlmsghdr *n)
  54         __attribute__((warn_unused_result));
  55
  56 struct rtnl_ctrl_data {
  57         int     nsid;
  58 };
  59
  60 typedef int (*rtnl_filter_t)(const struct sockaddr_nl *,
  61                              struct nlmsghdr *n, void *);
  62
  63 typedef int (*rtnl_listen_filter_t)(const struct sockaddr_nl *,
  64                                     struct rtnl_ctrl_data *,
  65                                     struct nlmsghdr *n, void *);
  66
  67 struct rtnl_dump_filter_arg {
  68         rtnl_filter_t filter;
  69         void *arg1;
  70         __u16 nc_flags;
  71 };
  72
  73 int rtnl_dump_filter_l(struct rtnl_handle *rth,
  74                               const struct rtnl_dump_filter_arg *arg);
  75 int rtnl_dump_filter_nc(struct rtnl_handle *rth,
  76                         rtnl_filter_t filter,
  77                         void *arg, __u16 nc_flags);
  78 #define rtnl_dump_filter(rth, filter, arg) \
  79         rtnl_dump_filter_nc(rth, filter, arg, 0)
  80 int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n,
  81               struct nlmsghdr *answer, size_t len)
  82         __attribute__((warn_unused_result));
  83 int rtnl_send(struct rtnl_handle *rth, const void *buf, int)
  84         __attribute__((warn_unused_result));
  85 int rtnl_send_check(struct rtnl_handle *rth, const void *buf, int)
  86         __attribute__((warn_unused_result));
  87
  88 int addattr(struct nlmsghdr *n, int maxlen, int type);
  89 int addattr8(struct nlmsghdr *n, int maxlen, int type, __u8 data);
  90 int addattr16(struct nlmsghdr *n, int maxlen, int type, __u16 data);
  91 int addattr32(struct nlmsghdr *n, int maxlen, int type, __u32 data);
  92 int addattr64(struct nlmsghdr *n, int maxlen, int type, __u64 data);
  93 int addattrstrz(struct nlmsghdr *n, int maxlen, int type, const char *data);
  94
  95 int addattr_l(struct nlmsghdr *n, int maxlen, int type,
  96               const void *data, int alen);
  97 int addraw_l(struct nlmsghdr *n, int maxlen, const void *data, int len);
  98 struct rtattr *addattr_nest(struct nlmsghdr *n, int maxlen, int type);
  99 int addattr_nest_end(struct nlmsghdr *n, struct rtattr *nest);
 100 struct rtattr *addattr_nest_compat(struct nlmsghdr *n, int maxlen, int type,
 101                                    const void *data, int len);
 102 int addattr_nest_compat_end(struct nlmsghdr *n, struct rtattr *nest);
 103 int rta_addattr8(struct rtattr *rta, int maxlen, int type, __u8 data);
 104 int rta_addattr16(struct rtattr *rta, int maxlen, int type, __u16 data);
 105 int rta_addattr32(struct rtattr *rta, int maxlen, int type, __u32 data);
 106 int rta_addattr64(struct rtattr *rta, int maxlen, int type, __u64 data);
 107 int rta_addattr_l(struct rtattr *rta, int maxlen, int type,
 108                   const void *data, int alen);
 109
 110 int parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta, int len);
 111 int parse_rtattr_flags(struct rtattr *tb[], int max, struct rtattr *rta,
 112                               int len, unsigned short flags);
 113 int parse_rtattr_byindex(struct rtattr *tb[], int max,
 114                          struct rtattr *rta, int len);
 115 struct rtattr *parse_rtattr_one(int type, struct rtattr *rta, int len);
 116 int __parse_rtattr_nested_compat(struct rtattr *tb[], int max, struct rtattr *rta, int len);
 117
 118 struct rtattr *rta_nest(struct rtattr *rta, int maxlen, int type);
 119 int rta_nest_end(struct rtattr *rta, struct rtattr *nest);
 120
 121 #define RTA_TAIL(rta) \
 122                 ((struct rtattr *) (((void *) (rta)) + \
 123                                     RTA_ALIGN((rta)->rta_len)))
 124
 125 #define parse_rtattr_nested(tb, max, rta) \
 126         (parse_rtattr((tb), (max), RTA_DATA(rta), RTA_PAYLOAD(rta)))
 127
 128 #define parse_rtattr_one_nested(type, rta) \
 129         (parse_rtattr_one(type, RTA_DATA(rta), RTA_PAYLOAD(rta)))
 130
 131 #define parse_rtattr_nested_compat(tb, max, rta, data, len) \
 132         ({ data = RTA_PAYLOAD(rta) >= len ? RTA_DATA(rta) : NULL;       \
 133                 __parse_rtattr_nested_compat(tb, max, rta, len); })
 134
 135 static inline __u8 rta_getattr_u8(const struct rtattr *rta)
 136 {
 137         return *(__u8 *)RTA_DATA(rta);
 138 }
 139 static inline __u16 rta_getattr_u16(const struct rtattr *rta)
 140 {
 141         return *(__u16 *)RTA_DATA(rta);
 142 }
 143 static inline __u32 rta_getattr_u32(const struct rtattr *rta)
 144 {
 145         return *(__u32 *)RTA_DATA(rta);
 146 }
 147 static inline __u64 rta_getattr_u64(const struct rtattr *rta)
 148 {
 149         __u64 tmp;
 150
 151         memcpy(&tmp, RTA_DATA(rta), sizeof(__u64));
 152         return tmp;
 153 }
 154 static inline const char *rta_getattr_str(const struct rtattr *rta)
 155 {
 156         return (const char *)RTA_DATA(rta);
 157 }
 158
 159 int rtnl_listen_all_nsid(struct rtnl_handle *);
 160 int rtnl_listen(struct rtnl_handle *, rtnl_listen_filter_t handler,
 161                 void *jarg);
 162 int rtnl_from_file(FILE *, rtnl_listen_filter_t handler,
 163                    void *jarg);
 164
 165 #define NLMSG_TAIL(nmsg) \
 166         ((struct rtattr *) (((void *) (nmsg)) + NLMSG_ALIGN((nmsg)->nlmsg_len)))
 167
 168 #ifndef IFA_RTA
 169 #define IFA_RTA(r) \
 170         ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ifaddrmsg))))
 171 #endif
 172 #ifndef IFA_PAYLOAD
 173 #define IFA_PAYLOAD(n)  NLMSG_PAYLOAD(n, sizeof(struct ifaddrmsg))
 174 #endif
 175
 176 #ifndef IFLA_RTA
 177 #define IFLA_RTA(r) \
 178         ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ifinfomsg))))
 179 #endif
 180 #ifndef IFLA_PAYLOAD
 181 #define IFLA_PAYLOAD(n) NLMSG_PAYLOAD(n, sizeof(struct ifinfomsg))
 182 #endif
 183
 184 #ifndef NDA_RTA
 185 #define NDA_RTA(r) \
 186         ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ndmsg))))
 187 #endif
 188 #ifndef NDA_PAYLOAD
 189 #define NDA_PAYLOAD(n)  NLMSG_PAYLOAD(n, sizeof(struct ndmsg))
 190 #endif
 191
 192 #ifndef NDTA_RTA
 193 #define NDTA_RTA(r) \
 194         ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ndtmsg))))
 195 #endif
 196 #ifndef NDTA_PAYLOAD
 197 #define NDTA_PAYLOAD(n) NLMSG_PAYLOAD(n, sizeof(struct ndtmsg))
 198 #endif
 199
 200 #ifndef NETNS_RTA
 201 #define NETNS_RTA(r) \
 202         ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct rtgenmsg))))
 203 #endif
 204 #ifndef NETNS_PAYLOAD
 205 #define NETNS_PAYLOAD(n)        NLMSG_PAYLOAD(n, sizeof(struct rtgenmsg))
 206 #endif
 207
 208 #ifndef IFLA_STATS_RTA
 209 #define IFLA_STATS_RTA(r) \
 210         ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct if_stats_msg))))
 211 #endif
 212
 213 /* User defined nlmsg_type which is used mostly for logging netlink
 214  * messages from dump file */
 215 #define NLMSG_TSTAMP    15
 216
 217 #endif /* __LIBNETLINK_H__ */