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 #include <arpa/inet.h>
  14
  15 struct rtnl_handle {
  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 #define RTNL_HANDLE_F_SUPPRESS_NLERR            0x02
  25         int                     flags;
  26 };
  27
  28 struct nlmsg_list {
  29         struct nlmsg_list *next;
  30         struct nlmsghdr   h;
  31 };
  32
  33 struct nlmsg_chain {
  34         struct nlmsg_list *head;
  35         struct nlmsg_list *tail;
  36 };
  37
  38 extern int rcvbuf;
  39
  40 int rtnl_open(struct rtnl_handle *rth, unsigned int subscriptions)
  41         __attribute__((warn_unused_result));
  42
  43 int rtnl_open_byproto(struct rtnl_handle *rth, unsigned int subscriptions,
  44                              int protocol)
  45         __attribute__((warn_unused_result));
  46
  47 void rtnl_close(struct rtnl_handle *rth);
  48 int rtnl_wilddump_request(struct rtnl_handle *rth, int fam, int type)
  49         __attribute__((warn_unused_result));
  50 int rtnl_wilddump_req_filter(struct rtnl_handle *rth, int fam, int type,
  51                                     __u32 filt_mask)
  52         __attribute__((warn_unused_result));
  53
  54 typedef int (*req_filter_fn_t)(struct nlmsghdr *nlh, int reqlen);
  55
  56 int rtnl_wilddump_req_filter_fn(struct rtnl_handle *rth, int fam, int type,
  57                                 req_filter_fn_t fn)
  58         __attribute__((warn_unused_result));
  59 int rtnl_wilddump_stats_req_filter(struct rtnl_handle *rth, int fam, int type,
  60                                    __u32 filt_mask)
  61         __attribute__((warn_unused_result));
  62 int rtnl_dump_request(struct rtnl_handle *rth, int type, void *req,
  63                              int len)
  64         __attribute__((warn_unused_result));
  65 int rtnl_dump_request_n(struct rtnl_handle *rth, struct nlmsghdr *n)
  66         __attribute__((warn_unused_result));
  67
  68 struct rtnl_ctrl_data {
  69         int     nsid;
  70 };
  71
  72 typedef int (*rtnl_filter_t)(const struct sockaddr_nl *,
  73                              struct nlmsghdr *n, void *);
  74
  75 typedef int (*rtnl_listen_filter_t)(const struct sockaddr_nl *,
  76                                     struct rtnl_ctrl_data *,
  77                                     struct nlmsghdr *n, void *);
  78
  79 struct rtnl_dump_filter_arg {
  80         rtnl_filter_t filter;
  81         void *arg1;
  82         __u16 nc_flags;
  83 };
  84
  85 int rtnl_dump_filter_l(struct rtnl_handle *rth,
  86                               const struct rtnl_dump_filter_arg *arg);
  87 int rtnl_dump_filter_nc(struct rtnl_handle *rth,
  88                         rtnl_filter_t filter,
  89                         void *arg, __u16 nc_flags);
  90 #define rtnl_dump_filter(rth, filter, arg) \
  91         rtnl_dump_filter_nc(rth, filter, arg, 0)
  92 int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n,
  93               struct nlmsghdr *answer, size_t len)
  94         __attribute__((warn_unused_result));
  95 int rtnl_talk_suppress_rtnl_errmsg(struct rtnl_handle *rtnl, struct nlmsghdr *n,
  96                                    struct nlmsghdr *answer, size_t len)
  97         __attribute__((warn_unused_result));
  98 int rtnl_send(struct rtnl_handle *rth, const void *buf, int)
  99         __attribute__((warn_unused_result));
 100 int rtnl_send_check(struct rtnl_handle *rth, const void *buf, int)
 101         __attribute__((warn_unused_result));
 102
 103 int addattr(struct nlmsghdr *n, int maxlen, int type);
 104 int addattr8(struct nlmsghdr *n, int maxlen, int type, __u8 data);
 105 int addattr16(struct nlmsghdr *n, int maxlen, int type, __u16 data);
 106 int addattr32(struct nlmsghdr *n, int maxlen, int type, __u32 data);
 107 int addattr64(struct nlmsghdr *n, int maxlen, int type, __u64 data);
 108 int addattrstrz(struct nlmsghdr *n, int maxlen, int type, const char *data);
 109
 110 int addattr_l(struct nlmsghdr *n, int maxlen, int type,
 111               const void *data, int alen);
 112 int addraw_l(struct nlmsghdr *n, int maxlen, const void *data, int len);
 113 struct rtattr *addattr_nest(struct nlmsghdr *n, int maxlen, int type);
 114 int addattr_nest_end(struct nlmsghdr *n, struct rtattr *nest);
 115 struct rtattr *addattr_nest_compat(struct nlmsghdr *n, int maxlen, int type,
 116                                    const void *data, int len);
 117 int addattr_nest_compat_end(struct nlmsghdr *n, struct rtattr *nest);
 118 int rta_addattr8(struct rtattr *rta, int maxlen, int type, __u8 data);
 119 int rta_addattr16(struct rtattr *rta, int maxlen, int type, __u16 data);
 120 int rta_addattr32(struct rtattr *rta, int maxlen, int type, __u32 data);
 121 int rta_addattr64(struct rtattr *rta, int maxlen, int type, __u64 data);
 122 int rta_addattr_l(struct rtattr *rta, int maxlen, int type,
 123                   const void *data, int alen);
 124
 125 int parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta, int len);
 126 int parse_rtattr_flags(struct rtattr *tb[], int max, struct rtattr *rta,
 127                               int len, unsigned short flags);
 128 int parse_rtattr_byindex(struct rtattr *tb[], int max,
 129                          struct rtattr *rta, int len);
 130 struct rtattr *parse_rtattr_one(int type, struct rtattr *rta, int len);
 131 int __parse_rtattr_nested_compat(struct rtattr *tb[], int max, struct rtattr *rta, int len);
 132
 133 struct rtattr *rta_nest(struct rtattr *rta, int maxlen, int type);
 134 int rta_nest_end(struct rtattr *rta, struct rtattr *nest);
 135
 136 #define RTA_TAIL(rta) \
 137                 ((struct rtattr *) (((void *) (rta)) + \
 138                                     RTA_ALIGN((rta)->rta_len)))
 139
 140 #define parse_rtattr_nested(tb, max, rta) \
 141         (parse_rtattr((tb), (max), RTA_DATA(rta), RTA_PAYLOAD(rta)))
 142
 143 #define parse_rtattr_one_nested(type, rta) \
 144         (parse_rtattr_one(type, RTA_DATA(rta), RTA_PAYLOAD(rta)))
 145
 146 #define parse_rtattr_nested_compat(tb, max, rta, data, len) \
 147         ({ data = RTA_PAYLOAD(rta) >= len ? RTA_DATA(rta) : NULL;       \
 148                 __parse_rtattr_nested_compat(tb, max, rta, len); })
 149
 150 static inline __u8 rta_getattr_u8(const struct rtattr *rta)
 151 {
 152         return *(__u8 *)RTA_DATA(rta);
 153 }
 154 static inline __u16 rta_getattr_u16(const struct rtattr *rta)
 155 {
 156         return *(__u16 *)RTA_DATA(rta);
 157 }
 158 static inline __be16 rta_getattr_be16(const struct rtattr *rta)
 159 {
 160         return ntohs(rta_getattr_u16(rta));
 161 }
 162 static inline __u32 rta_getattr_u32(const struct rtattr *rta)
 163 {
 164         return *(__u32 *)RTA_DATA(rta);
 165 }
 166 static inline __be32 rta_getattr_be32(const struct rtattr *rta)
 167 {
 168         return ntohl(rta_getattr_u32(rta));
 169 }
 170 static inline __u64 rta_getattr_u64(const struct rtattr *rta)
 171 {
 172         __u64 tmp;
 173
 174         memcpy(&tmp, RTA_DATA(rta), sizeof(__u64));
 175         return tmp;
 176 }
 177 static inline const char *rta_getattr_str(const struct rtattr *rta)
 178 {
 179         return (const char *)RTA_DATA(rta);
 180 }
 181
 182 int rtnl_listen_all_nsid(struct rtnl_handle *);
 183 int rtnl_listen(struct rtnl_handle *, rtnl_listen_filter_t handler,
 184                 void *jarg);
 185 int rtnl_from_file(FILE *, rtnl_listen_filter_t handler,
 186                    void *jarg);
 187
 188 #define NLMSG_TAIL(nmsg) \
 189         ((struct rtattr *) (((void *) (nmsg)) + NLMSG_ALIGN((nmsg)->nlmsg_len)))
 190
 191 #ifndef IFA_RTA
 192 #define IFA_RTA(r) \
 193         ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ifaddrmsg))))
 194 #endif
 195 #ifndef IFA_PAYLOAD
 196 #define IFA_PAYLOAD(n)  NLMSG_PAYLOAD(n, sizeof(struct ifaddrmsg))
 197 #endif
 198
 199 #ifndef IFLA_RTA
 200 #define IFLA_RTA(r) \
 201         ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ifinfomsg))))
 202 #endif
 203 #ifndef IFLA_PAYLOAD
 204 #define IFLA_PAYLOAD(n) NLMSG_PAYLOAD(n, sizeof(struct ifinfomsg))
 205 #endif
 206
 207 #ifndef NDA_RTA
 208 #define NDA_RTA(r) \
 209         ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ndmsg))))
 210 #endif
 211 #ifndef NDA_PAYLOAD
 212 #define NDA_PAYLOAD(n)  NLMSG_PAYLOAD(n, sizeof(struct ndmsg))
 213 #endif
 214
 215 #ifndef NDTA_RTA
 216 #define NDTA_RTA(r) \
 217         ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ndtmsg))))
 218 #endif
 219 #ifndef NDTA_PAYLOAD
 220 #define NDTA_PAYLOAD(n) NLMSG_PAYLOAD(n, sizeof(struct ndtmsg))
 221 #endif
 222
 223 #ifndef NETNS_RTA
 224 #define NETNS_RTA(r) \
 225         ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct rtgenmsg))))
 226 #endif
 227 #ifndef NETNS_PAYLOAD
 228 #define NETNS_PAYLOAD(n)        NLMSG_PAYLOAD(n, sizeof(struct rtgenmsg))
 229 #endif
 230
 231 #ifndef IFLA_STATS_RTA
 232 #define IFLA_STATS_RTA(r) \
 233         ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct if_stats_msg))))
 234 #endif
 235
 236 /* User defined nlmsg_type which is used mostly for logging netlink
 237  * messages from dump file */
 238 #define NLMSG_TSTAMP    15
 239
 240 #endif /* __LIBNETLINK_H__ */