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 typedef int (*nl_ext_ack_fn_t)(const char *errmsg, uint32_t off,
  80                                const struct nlmsghdr *inner_nlh);
  81
  82 struct rtnl_dump_filter_arg {
  83         rtnl_filter_t filter;
  84         void *arg1;
  85         __u16 nc_flags;
  86 };
  87
  88 int rtnl_dump_filter_l(struct rtnl_handle *rth,
  89                               const struct rtnl_dump_filter_arg *arg);
  90 int rtnl_dump_filter_nc(struct rtnl_handle *rth,
  91                         rtnl_filter_t filter,
  92                         void *arg, __u16 nc_flags);
  93 #define rtnl_dump_filter(rth, filter, arg) \
  94         rtnl_dump_filter_nc(rth, filter, arg, 0)
  95 int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n,
  96               struct nlmsghdr **answer)
  97         __attribute__((warn_unused_result));
  98 int rtnl_talk_extack(struct rtnl_handle *rtnl, struct nlmsghdr *n,
  99               struct nlmsghdr **answer, nl_ext_ack_fn_t errfn)
 100         __attribute__((warn_unused_result));
 101 int rtnl_talk_suppress_rtnl_errmsg(struct rtnl_handle *rtnl, struct nlmsghdr *n,
 102                                    struct nlmsghdr **answer)
 103         __attribute__((warn_unused_result));
 104 int rtnl_send(struct rtnl_handle *rth, const void *buf, int)
 105         __attribute__((warn_unused_result));
 106 int rtnl_send_check(struct rtnl_handle *rth, const void *buf, int)
 107         __attribute__((warn_unused_result));
 108
 109 int addattr(struct nlmsghdr *n, int maxlen, int type);
 110 int addattr8(struct nlmsghdr *n, int maxlen, int type, __u8 data);
 111 int addattr16(struct nlmsghdr *n, int maxlen, int type, __u16 data);
 112 int addattr32(struct nlmsghdr *n, int maxlen, int type, __u32 data);
 113 int addattr64(struct nlmsghdr *n, int maxlen, int type, __u64 data);
 114 int addattrstrz(struct nlmsghdr *n, int maxlen, int type, const char *data);
 115
 116 int addattr_l(struct nlmsghdr *n, int maxlen, int type,
 117               const void *data, int alen);
 118 int addraw_l(struct nlmsghdr *n, int maxlen, const void *data, int len);
 119 struct rtattr *addattr_nest(struct nlmsghdr *n, int maxlen, int type);
 120 int addattr_nest_end(struct nlmsghdr *n, struct rtattr *nest);
 121 struct rtattr *addattr_nest_compat(struct nlmsghdr *n, int maxlen, int type,
 122                                    const void *data, int len);
 123 int addattr_nest_compat_end(struct nlmsghdr *n, struct rtattr *nest);
 124 int rta_addattr8(struct rtattr *rta, int maxlen, int type, __u8 data);
 125 int rta_addattr16(struct rtattr *rta, int maxlen, int type, __u16 data);
 126 int rta_addattr32(struct rtattr *rta, int maxlen, int type, __u32 data);
 127 int rta_addattr64(struct rtattr *rta, int maxlen, int type, __u64 data);
 128 int rta_addattr_l(struct rtattr *rta, int maxlen, int type,
 129                   const void *data, int alen);
 130
 131 int parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta, int len);
 132 int parse_rtattr_flags(struct rtattr *tb[], int max, struct rtattr *rta,
 133                               int len, unsigned short flags);
 134 int parse_rtattr_byindex(struct rtattr *tb[], int max,
 135                          struct rtattr *rta, int len);
 136 struct rtattr *parse_rtattr_one(int type, struct rtattr *rta, int len);
 137 int __parse_rtattr_nested_compat(struct rtattr *tb[], int max, struct rtattr *rta, int len);
 138
 139 struct rtattr *rta_nest(struct rtattr *rta, int maxlen, int type);
 140 int rta_nest_end(struct rtattr *rta, struct rtattr *nest);
 141
 142 #define RTA_TAIL(rta) \
 143                 ((struct rtattr *) (((void *) (rta)) + \
 144                                     RTA_ALIGN((rta)->rta_len)))
 145
 146 #define parse_rtattr_nested(tb, max, rta) \
 147         (parse_rtattr((tb), (max), RTA_DATA(rta), RTA_PAYLOAD(rta)))
 148
 149 #define parse_rtattr_one_nested(type, rta) \
 150         (parse_rtattr_one(type, RTA_DATA(rta), RTA_PAYLOAD(rta)))
 151
 152 #define parse_rtattr_nested_compat(tb, max, rta, data, len) \
 153         ({ data = RTA_PAYLOAD(rta) >= len ? RTA_DATA(rta) : NULL;       \
 154                 __parse_rtattr_nested_compat(tb, max, rta, len); })
 155
 156 static inline __u8 rta_getattr_u8(const struct rtattr *rta)
 157 {
 158         return *(__u8 *)RTA_DATA(rta);
 159 }
 160 static inline __u16 rta_getattr_u16(const struct rtattr *rta)
 161 {
 162         return *(__u16 *)RTA_DATA(rta);
 163 }
 164 static inline __be16 rta_getattr_be16(const struct rtattr *rta)
 165 {
 166         return ntohs(rta_getattr_u16(rta));
 167 }
 168 static inline __u32 rta_getattr_u32(const struct rtattr *rta)
 169 {
 170         return *(__u32 *)RTA_DATA(rta);
 171 }
 172 static inline __be32 rta_getattr_be32(const struct rtattr *rta)
 173 {
 174         return ntohl(rta_getattr_u32(rta));
 175 }
 176 static inline __u64 rta_getattr_u64(const struct rtattr *rta)
 177 {
 178         __u64 tmp;
 179
 180         memcpy(&tmp, RTA_DATA(rta), sizeof(__u64));
 181         return tmp;
 182 }
 183 static inline const char *rta_getattr_str(const struct rtattr *rta)
 184 {
 185         return (const char *)RTA_DATA(rta);
 186 }
 187
 188 int rtnl_listen_all_nsid(struct rtnl_handle *);
 189 int rtnl_listen(struct rtnl_handle *, rtnl_listen_filter_t handler,
 190                 void *jarg);
 191 int rtnl_from_file(FILE *, rtnl_listen_filter_t handler,
 192                    void *jarg);
 193
 194 #define NLMSG_TAIL(nmsg) \
 195         ((struct rtattr *) (((void *) (nmsg)) + NLMSG_ALIGN((nmsg)->nlmsg_len)))
 196
 197 #ifndef IFA_RTA
 198 #define IFA_RTA(r) \
 199         ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ifaddrmsg))))
 200 #endif
 201 #ifndef IFA_PAYLOAD
 202 #define IFA_PAYLOAD(n)  NLMSG_PAYLOAD(n, sizeof(struct ifaddrmsg))
 203 #endif
 204
 205 #ifndef IFLA_RTA
 206 #define IFLA_RTA(r) \
 207         ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ifinfomsg))))
 208 #endif
 209 #ifndef IFLA_PAYLOAD
 210 #define IFLA_PAYLOAD(n) NLMSG_PAYLOAD(n, sizeof(struct ifinfomsg))
 211 #endif
 212
 213 #ifndef NDA_RTA
 214 #define NDA_RTA(r) \
 215         ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ndmsg))))
 216 #endif
 217 #ifndef NDA_PAYLOAD
 218 #define NDA_PAYLOAD(n)  NLMSG_PAYLOAD(n, sizeof(struct ndmsg))
 219 #endif
 220
 221 #ifndef NDTA_RTA
 222 #define NDTA_RTA(r) \
 223         ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ndtmsg))))
 224 #endif
 225 #ifndef NDTA_PAYLOAD
 226 #define NDTA_PAYLOAD(n) NLMSG_PAYLOAD(n, sizeof(struct ndtmsg))
 227 #endif
 228
 229 #ifndef NETNS_RTA
 230 #define NETNS_RTA(r) \
 231         ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct rtgenmsg))))
 232 #endif
 233 #ifndef NETNS_PAYLOAD
 234 #define NETNS_PAYLOAD(n)        NLMSG_PAYLOAD(n, sizeof(struct rtgenmsg))
 235 #endif
 236
 237 #ifndef IFLA_STATS_RTA
 238 #define IFLA_STATS_RTA(r) \
 239         ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct if_stats_msg))))
 240 #endif
 241
 242 /* User defined nlmsg_type which is used mostly for logging netlink
 243  * messages from dump file */
 244 #define NLMSG_TSTAMP    15
 245
 246 #endif /* __LIBNETLINK_H__ */