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