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 };
  24
  25 extern int rcvbuf;
  26
  27 extern int rtnl_open(struct rtnl_handle *rth, unsigned subscriptions)
  28         __attribute__((warn_unused_result));
  29
  30 extern int rtnl_open_byproto(struct rtnl_handle *rth, unsigned subscriptions,
  31                              int protocol)
  32         __attribute__((warn_unused_result));
  33
  34 extern void rtnl_close(struct rtnl_handle *rth);
  35 extern int rtnl_wilddump_request(struct rtnl_handle *rth, int fam, int type)
  36         __attribute__((warn_unused_result));
  37 extern int rtnl_wilddump_req_filter(struct rtnl_handle *rth, int fam, int type,
  38                                     __u32 filt_mask)
  39         __attribute__((warn_unused_result));
  40 extern int rtnl_dump_request(struct rtnl_handle *rth, int type, void *req,
  41                              int len)
  42         __attribute__((warn_unused_result));
  43
  44 typedef int (*rtnl_filter_t)(const struct sockaddr_nl *,
  45                              struct nlmsghdr *n, void *);
  46
  47 struct rtnl_dump_filter_arg
  48 {
  49         rtnl_filter_t filter;
  50         void *arg1;
  51 };
  52
  53 extern int rtnl_dump_filter_l(struct rtnl_handle *rth,
  54                               const struct rtnl_dump_filter_arg *arg);
  55 extern int rtnl_dump_filter(struct rtnl_handle *rth, rtnl_filter_t filter,
  56                             void *arg);
  57 extern int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n,
  58                      struct nlmsghdr *answer, size_t len)
  59         __attribute__((warn_unused_result));
  60 extern int rtnl_send(struct rtnl_handle *rth, const void *buf, int)
  61         __attribute__((warn_unused_result));
  62 extern int rtnl_send_check(struct rtnl_handle *rth, const void *buf, int)
  63         __attribute__((warn_unused_result));
  64
  65 extern int addattr(struct nlmsghdr *n, int maxlen, int type);
  66 extern int addattr8(struct nlmsghdr *n, int maxlen, int type, __u8 data);
  67 extern int addattr16(struct nlmsghdr *n, int maxlen, int type, __u16 data);
  68 extern int addattr32(struct nlmsghdr *n, int maxlen, int type, __u32 data);
  69 extern int addattr64(struct nlmsghdr *n, int maxlen, int type, __u64 data);
  70 extern int addattrstrz(struct nlmsghdr *n, int maxlen, int type, const char *data);
  71
  72 extern int addattr_l(struct nlmsghdr *n, int maxlen, int type, const void *data, int alen);
  73 extern int addraw_l(struct nlmsghdr *n, int maxlen, const void *data, int len);
  74 extern struct rtattr *addattr_nest(struct nlmsghdr *n, int maxlen, int type);
  75 extern int addattr_nest_end(struct nlmsghdr *n, struct rtattr *nest);
  76 extern struct rtattr *addattr_nest_compat(struct nlmsghdr *n, int maxlen, int type, const void *data, int len);
  77 extern int addattr_nest_compat_end(struct nlmsghdr *n, struct rtattr *nest);
  78 extern int rta_addattr32(struct rtattr *rta, int maxlen, int type, __u32 data);
  79 extern int rta_addattr_l(struct rtattr *rta, int maxlen, int type, const void *data, int alen);
  80
  81 extern int parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta, int len);
  82 extern int parse_rtattr_flags(struct rtattr *tb[], int max, struct rtattr *rta,
  83                               int len, unsigned short flags);
  84 extern int parse_rtattr_byindex(struct rtattr *tb[], int max, struct rtattr *rta, int len);
  85 extern struct rtattr *parse_rtattr_one(int type, struct rtattr *rta, int len);
  86 extern int __parse_rtattr_nested_compat(struct rtattr *tb[], int max, struct rtattr *rta, int len);
  87
  88 #define parse_rtattr_nested(tb, max, rta) \
  89         (parse_rtattr((tb), (max), RTA_DATA(rta), RTA_PAYLOAD(rta)))
  90
  91 #define parse_rtattr_one_nested(type, rta) \
  92         (parse_rtattr_one(type, RTA_DATA(rta), RTA_PAYLOAD(rta)))
  93
  94 #define parse_rtattr_nested_compat(tb, max, rta, data, len) \
  95         ({ data = RTA_PAYLOAD(rta) >= len ? RTA_DATA(rta) : NULL;       \
  96                 __parse_rtattr_nested_compat(tb, max, rta, len); })
  97
  98 static inline __u8 rta_getattr_u8(const struct rtattr *rta)
  99 {
 100         return *(__u8 *)RTA_DATA(rta);
 101 }
 102 static inline __u16 rta_getattr_u16(const struct rtattr *rta)
 103 {
 104         return *(__u16 *)RTA_DATA(rta);
 105 }
 106 static inline __u32 rta_getattr_u32(const struct rtattr *rta)
 107 {
 108         return *(__u32 *)RTA_DATA(rta);
 109 }
 110 static inline __u64 rta_getattr_u64(const struct rtattr *rta)
 111 {
 112         __u64 tmp;
 113         memcpy(&tmp, RTA_DATA(rta), sizeof(__u64));
 114         return tmp;
 115 }
 116 static inline const char *rta_getattr_str(const struct rtattr *rta)
 117 {
 118         return (const char *)RTA_DATA(rta);
 119 }
 120
 121 extern int rtnl_listen(struct rtnl_handle *, rtnl_filter_t handler,
 122                        void *jarg);
 123 extern int rtnl_from_file(FILE *, rtnl_filter_t handler,
 124                        void *jarg);
 125
 126 #define NLMSG_TAIL(nmsg) \
 127         ((struct rtattr *) (((void *) (nmsg)) + NLMSG_ALIGN((nmsg)->nlmsg_len)))
 128
 129 #ifndef IFA_RTA
 130 #define IFA_RTA(r) \
 131         ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ifaddrmsg))))
 132 #endif
 133 #ifndef IFA_PAYLOAD
 134 #define IFA_PAYLOAD(n)  NLMSG_PAYLOAD(n,sizeof(struct ifaddrmsg))
 135 #endif
 136
 137 #ifndef IFLA_RTA
 138 #define IFLA_RTA(r) \
 139         ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ifinfomsg))))
 140 #endif
 141 #ifndef IFLA_PAYLOAD
 142 #define IFLA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct ifinfomsg))
 143 #endif
 144
 145 #ifndef NDA_RTA
 146 #define NDA_RTA(r) \
 147         ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ndmsg))))
 148 #endif
 149 #ifndef NDA_PAYLOAD
 150 #define NDA_PAYLOAD(n)  NLMSG_PAYLOAD(n,sizeof(struct ndmsg))
 151 #endif
 152
 153 #ifndef NDTA_RTA
 154 #define NDTA_RTA(r) \
 155         ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ndtmsg))))
 156 #endif
 157 #ifndef NDTA_PAYLOAD
 158 #define NDTA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct ndtmsg))
 159 #endif
 160
 161 #ifndef NETNS_RTA
 162 #define NETNS_RTA(r) \
 163         ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct rtgenmsg))))
 164 #endif
 165 #ifndef NETNS_PAYLOAD
 166 #define NETNS_PAYLOAD(n)        NLMSG_PAYLOAD(n,sizeof(struct rtgenmsg))
 167 #endif
 168
 169 /* User defined nlmsg_type which is used mostly for logging netlink
 170  * messages from dump file */
 171 #define NLMSG_TSTAMP    15
 172
 173 #endif /* __LIBNETLINK_H__ */
 174