1 /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2 1
2
3 /*
4 * NETLINK Netlink attributes
5 *
6 * Copyright (c) 2003-2013 Thomas Graf <tgraf@
7 */
8
9 #ifndef __LIBBPF_NLATTR_H
10 #define __LIBBPF_NLATTR_H
11
12 #include <stdint.h>
13 #include <string.h>
14 #include <errno.h>
15 #include <linux/netlink.h>
16 #include <linux/rtnetlink.h>
17 #include <linux/genetlink.h>
18
19 /* avoid multiple definition of netlink featur
20 #define __LINUX_NETLINK_H
21
22 /**
23 * Standard attribute types to specify validat
24 */
25 enum {
26 LIBBPF_NLA_UNSPEC, /**< Unspecifi
27 LIBBPF_NLA_U8, /**< 8 bit int
28 LIBBPF_NLA_U16, /**< 16 bit in
29 LIBBPF_NLA_U32, /**< 32 bit in
30 LIBBPF_NLA_U64, /**< 64 bit in
31 LIBBPF_NLA_STRING, /**< NUL termi
32 LIBBPF_NLA_FLAG, /**< Flag */
33 LIBBPF_NLA_MSECS, /**< Micro sec
34 LIBBPF_NLA_NESTED, /**< Nested at
35 __LIBBPF_NLA_TYPE_MAX,
36 };
37
38 #define LIBBPF_NLA_TYPE_MAX (__LIBBPF_NLA_TYPE
39
40 /**
41 * @ingroup attr
42 * Attribute validation policy.
43 *
44 * See section @core_doc{core_attr_parse,Attri
45 */
46 struct libbpf_nla_policy {
47 /** Type of attribute or LIBBPF_NLA_UN
48 uint16_t type;
49
50 /** Minimal length of payload required
51 uint16_t minlen;
52
53 /** Maximal length of payload allowed
54 uint16_t maxlen;
55 };
56
57 struct libbpf_nla_req {
58 struct nlmsghdr nh;
59 union {
60 struct ifinfomsg ifinfo;
61 struct tcmsg tc;
62 struct genlmsghdr gnl;
63 };
64 char buf[128];
65 };
66
67 /**
68 * @ingroup attr
69 * Iterate over a stream of attributes
70 * @arg pos loop counter, set to current a
71 * @arg head head of attribute stream
72 * @arg len length of attribute stream
73 * @arg rem initialized to len, holds byte
74 */
75 #define libbpf_nla_for_each_attr(pos, head, le
76 for (pos = head, rem = len; \
77 nla_ok(pos, rem); \
78 pos = nla_next(pos, &(rem)))
79
80 /**
81 * libbpf_nla_data - head of payload
82 * @nla: netlink attribute
83 */
84 static inline void *libbpf_nla_data(const stru
85 {
86 return (void *)nla + NLA_HDRLEN;
87 }
88
89 static inline uint8_t libbpf_nla_getattr_u8(co
90 {
91 return *(uint8_t *)libbpf_nla_data(nla
92 }
93
94 static inline uint16_t libbpf_nla_getattr_u16(
95 {
96 return *(uint16_t *)libbpf_nla_data(nl
97 }
98
99 static inline uint32_t libbpf_nla_getattr_u32(
100 {
101 return *(uint32_t *)libbpf_nla_data(nl
102 }
103
104 static inline uint64_t libbpf_nla_getattr_u64(
105 {
106 return *(uint64_t *)libbpf_nla_data(nl
107 }
108
109 static inline const char *libbpf_nla_getattr_s
110 {
111 return (const char *)libbpf_nla_data(n
112 }
113
114 /**
115 * libbpf_nla_len - length of payload
116 * @nla: netlink attribute
117 */
118 static inline int libbpf_nla_len(const struct
119 {
120 return nla->nla_len - NLA_HDRLEN;
121 }
122
123 int libbpf_nla_parse(struct nlattr *tb[], int
124 int len, struct libbpf_nl
125 int libbpf_nla_parse_nested(struct nlattr *tb[
126 struct nlattr *nla
127 struct libbpf_nla_
128
129 int libbpf_nla_dump_errormsg(struct nlmsghdr *
130
131 static inline struct nlattr *nla_data(struct n
132 {
133 return (struct nlattr *)((void *)nla +
134 }
135
136 static inline struct nlattr *req_tail(struct l
137 {
138 return (struct nlattr *)((void *)req +
139 }
140
141 static inline int nlattr_add(struct libbpf_nla
142 const void *data,
143 {
144 struct nlattr *nla;
145
146 if (NLMSG_ALIGN(req->nh.nlmsg_len) + N
147 return -EMSGSIZE;
148 if (!!data != !!len)
149 return -EINVAL;
150
151 nla = req_tail(req);
152 nla->nla_type = type;
153 nla->nla_len = NLA_HDRLEN + len;
154 if (data)
155 memcpy(nla_data(nla), data, le
156 req->nh.nlmsg_len = NLMSG_ALIGN(req->n
157 return 0;
158 }
159
160 static inline struct nlattr *nlattr_begin_nest
161 {
162 struct nlattr *tail;
163
164 tail = req_tail(req);
165 if (nlattr_add(req, type | NLA_F_NESTE
166 return NULL;
167 return tail;
168 }
169
170 static inline void nlattr_end_nested(struct li
171 struct nl
172 {
173 tail->nla_len = (void *)req_tail(req)
174 }
175
176 #endif /* __LIBBPF_NLATTR_H */
177
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