2 * netlink/msg.c Netlink Messages Interface
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation version 2.1
9 * Copyright (c) 2003-2006 Thomas Graf <tgraf@suug.ch>
12 #ifndef NETLINK_MSG_H_
13 #define NETLINK_MSG_H_
15 #include <netlink/netlink.h>
16 #include <netlink/object.h>
17 #include <netlink/attr.h>
28 * Will cause the netlink pid to be set to the pid assigned to
29 * the netlink handle (socket) just before sending the message off.
30 * @note Requires the use of nl_send_auto_complete()!
37 * May be used to refer to a sequence number which should be
38 * automatically set just before sending the message off.
39 * @note Requires the use of nl_send_auto_complete()!
47 /* size calculations */
48 extern int nlmsg_msg_size(int);
49 extern int nlmsg_total_size(int);
50 extern int nlmsg_padlen(int);
53 extern void * nlmsg_data(const struct nlmsghdr *);
54 extern int nlmsg_len(const struct nlmsghdr *);
55 extern void * nlmsg_tail(const struct nlmsghdr *);
57 /* attribute access */
58 extern struct nlattr * nlmsg_attrdata(const struct nlmsghdr *, int);
59 extern int nlmsg_attrlen(const struct nlmsghdr *, int);
62 extern int nlmsg_valid_hdr(const struct nlmsghdr *, int);
63 extern int nlmsg_ok(const struct nlmsghdr *, int);
64 extern struct nlmsghdr * nlmsg_next(struct nlmsghdr *, int *);
65 extern int nlmsg_parse(struct nlmsghdr *, int, struct nlattr **,
66 int, struct nla_policy *);
67 extern struct nlattr * nlmsg_find_attr(struct nlmsghdr *, int, int);
68 extern int nlmsg_validate(struct nlmsghdr *, int, int,
71 extern struct nl_msg * nlmsg_alloc(void);
72 extern struct nl_msg * nlmsg_alloc_size(size_t);
73 extern struct nl_msg * nlmsg_alloc_simple(int, int);
74 extern void nlmsg_set_default_size(size_t);
75 extern struct nl_msg * nlmsg_inherit(struct nlmsghdr *);
76 extern struct nl_msg * nlmsg_convert(struct nlmsghdr *);
77 extern void * nlmsg_reserve(struct nl_msg *, size_t, int);
78 extern int nlmsg_append(struct nl_msg *, void *, size_t, int);
79 extern int nlmsg_expand(struct nl_msg *, size_t);
81 extern struct nlmsghdr * nlmsg_put(struct nl_msg *, uint32_t, uint32_t,
83 extern struct nlmsghdr * nlmsg_hdr(struct nl_msg *);
84 extern void nlmsg_get(struct nl_msg *);
85 extern void nlmsg_free(struct nl_msg *);
87 /* attribute modification */
88 extern void nlmsg_set_proto(struct nl_msg *, int);
89 extern int nlmsg_get_proto(struct nl_msg *);
90 extern size_t nlmsg_get_max_size(struct nl_msg *);
91 extern void nlmsg_set_src(struct nl_msg *, struct sockaddr_nl *);
92 extern struct sockaddr_nl *nlmsg_get_src(struct nl_msg *);
93 extern void nlmsg_set_dst(struct nl_msg *, struct sockaddr_nl *);
94 extern struct sockaddr_nl *nlmsg_get_dst(struct nl_msg *);
95 extern void nlmsg_set_creds(struct nl_msg *, struct ucred *);
96 extern struct ucred * nlmsg_get_creds(struct nl_msg *);
98 extern char * nl_nlmsgtype2str(int, char *, size_t);
99 extern int nl_str2nlmsgtype(const char *);
101 extern char * nl_nlmsg_flags2str(int, char *, size_t);
103 extern int nl_msg_parse(struct nl_msg *,
104 void (*cb)(struct nl_object *, void *),
107 extern void nl_msg_dump(struct nl_msg *, FILE *);
116 * Iterate over a stream of attributes in a message
117 * @arg pos loop counter, set to current attribute
118 * @arg nlh netlink message header
119 * @arg hdrlen length of family header
120 * @arg rem initialized to len, holds bytes currently remaining in stream
122 #define nlmsg_for_each_attr(pos, nlh, hdrlen, rem) \
123 nla_for_each_attr(pos, nlmsg_attrdata(nlh, hdrlen), \
124 nlmsg_attrlen(nlh, hdrlen), rem)
127 * Iterate over a stream of messages
128 * @arg pos loop counter, set to current message
129 * @arg head head of message stream
130 * @arg len length of message stream
131 * @arg rem initialized to len, holds bytes currently remaining in stream
133 #define nlmsg_for_each_msg(pos, head, len, rem) \
134 for (pos = head, rem = len; \
135 nlmsg_ok(pos, rem); \
136 pos = nlmsg_next(pos, &(rem)))