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