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