1 /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2 1 /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
2 2
3 /* 3 /*
4 * NETLINK Netlink attributes 4 * NETLINK Netlink attributes
5 * 5 *
6 * Copyright (c) 2003-2013 Thomas Graf <tgraf@ 6 * Copyright (c) 2003-2013 Thomas Graf <tgraf@suug.ch>
7 */ 7 */
8 8
9 #ifndef __LIBBPF_NLATTR_H 9 #ifndef __LIBBPF_NLATTR_H
10 #define __LIBBPF_NLATTR_H 10 #define __LIBBPF_NLATTR_H
11 11
12 #include <stdint.h> 12 #include <stdint.h>
13 #include <string.h> <<
14 #include <errno.h> <<
15 #include <linux/netlink.h> 13 #include <linux/netlink.h>
16 #include <linux/rtnetlink.h> <<
17 #include <linux/genetlink.h> <<
18 <<
19 /* avoid multiple definition of netlink featur 14 /* avoid multiple definition of netlink features */
20 #define __LINUX_NETLINK_H 15 #define __LINUX_NETLINK_H
21 16
22 /** 17 /**
23 * Standard attribute types to specify validat 18 * Standard attribute types to specify validation policy
24 */ 19 */
25 enum { 20 enum {
26 LIBBPF_NLA_UNSPEC, /**< Unspecifi 21 LIBBPF_NLA_UNSPEC, /**< Unspecified type, binary data chunk */
27 LIBBPF_NLA_U8, /**< 8 bit int 22 LIBBPF_NLA_U8, /**< 8 bit integer */
28 LIBBPF_NLA_U16, /**< 16 bit in 23 LIBBPF_NLA_U16, /**< 16 bit integer */
29 LIBBPF_NLA_U32, /**< 32 bit in 24 LIBBPF_NLA_U32, /**< 32 bit integer */
30 LIBBPF_NLA_U64, /**< 64 bit in 25 LIBBPF_NLA_U64, /**< 64 bit integer */
31 LIBBPF_NLA_STRING, /**< NUL termi 26 LIBBPF_NLA_STRING, /**< NUL terminated character string */
32 LIBBPF_NLA_FLAG, /**< Flag */ 27 LIBBPF_NLA_FLAG, /**< Flag */
33 LIBBPF_NLA_MSECS, /**< Micro sec 28 LIBBPF_NLA_MSECS, /**< Micro seconds (64bit) */
34 LIBBPF_NLA_NESTED, /**< Nested at 29 LIBBPF_NLA_NESTED, /**< Nested attributes */
35 __LIBBPF_NLA_TYPE_MAX, 30 __LIBBPF_NLA_TYPE_MAX,
36 }; 31 };
37 32
38 #define LIBBPF_NLA_TYPE_MAX (__LIBBPF_NLA_TYPE 33 #define LIBBPF_NLA_TYPE_MAX (__LIBBPF_NLA_TYPE_MAX - 1)
39 34
40 /** 35 /**
41 * @ingroup attr 36 * @ingroup attr
42 * Attribute validation policy. 37 * Attribute validation policy.
43 * 38 *
44 * See section @core_doc{core_attr_parse,Attri 39 * See section @core_doc{core_attr_parse,Attribute Parsing} for more details.
45 */ 40 */
46 struct libbpf_nla_policy { 41 struct libbpf_nla_policy {
47 /** Type of attribute or LIBBPF_NLA_UN 42 /** Type of attribute or LIBBPF_NLA_UNSPEC */
48 uint16_t type; 43 uint16_t type;
49 44
50 /** Minimal length of payload required 45 /** Minimal length of payload required */
51 uint16_t minlen; 46 uint16_t minlen;
52 47
53 /** Maximal length of payload allowed 48 /** Maximal length of payload allowed */
54 uint16_t maxlen; 49 uint16_t maxlen;
55 }; 50 };
56 51
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 /** 52 /**
68 * @ingroup attr 53 * @ingroup attr
69 * Iterate over a stream of attributes 54 * Iterate over a stream of attributes
70 * @arg pos loop counter, set to current a 55 * @arg pos loop counter, set to current attribute
71 * @arg head head of attribute stream 56 * @arg head head of attribute stream
72 * @arg len length of attribute stream 57 * @arg len length of attribute stream
73 * @arg rem initialized to len, holds byte 58 * @arg rem initialized to len, holds bytes currently remaining in stream
74 */ 59 */
75 #define libbpf_nla_for_each_attr(pos, head, le 60 #define libbpf_nla_for_each_attr(pos, head, len, rem) \
76 for (pos = head, rem = len; \ 61 for (pos = head, rem = len; \
77 nla_ok(pos, rem); \ 62 nla_ok(pos, rem); \
78 pos = nla_next(pos, &(rem))) 63 pos = nla_next(pos, &(rem)))
79 64
80 /** 65 /**
81 * libbpf_nla_data - head of payload 66 * libbpf_nla_data - head of payload
82 * @nla: netlink attribute 67 * @nla: netlink attribute
83 */ 68 */
84 static inline void *libbpf_nla_data(const stru 69 static inline void *libbpf_nla_data(const struct nlattr *nla)
85 { 70 {
86 return (void *)nla + NLA_HDRLEN; !! 71 return (char *) nla + NLA_HDRLEN;
87 } 72 }
88 73
89 static inline uint8_t libbpf_nla_getattr_u8(co 74 static inline uint8_t libbpf_nla_getattr_u8(const struct nlattr *nla)
90 { 75 {
91 return *(uint8_t *)libbpf_nla_data(nla 76 return *(uint8_t *)libbpf_nla_data(nla);
92 } 77 }
93 78
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( 79 static inline uint32_t libbpf_nla_getattr_u32(const struct nlattr *nla)
100 { 80 {
101 return *(uint32_t *)libbpf_nla_data(nl 81 return *(uint32_t *)libbpf_nla_data(nla);
102 } 82 }
103 83
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 84 static inline const char *libbpf_nla_getattr_str(const struct nlattr *nla)
110 { 85 {
111 return (const char *)libbpf_nla_data(n 86 return (const char *)libbpf_nla_data(nla);
112 } 87 }
113 88
114 /** 89 /**
115 * libbpf_nla_len - length of payload 90 * libbpf_nla_len - length of payload
116 * @nla: netlink attribute 91 * @nla: netlink attribute
117 */ 92 */
118 static inline int libbpf_nla_len(const struct 93 static inline int libbpf_nla_len(const struct nlattr *nla)
119 { 94 {
120 return nla->nla_len - NLA_HDRLEN; 95 return nla->nla_len - NLA_HDRLEN;
121 } 96 }
122 97
123 int libbpf_nla_parse(struct nlattr *tb[], int 98 int libbpf_nla_parse(struct nlattr *tb[], int maxtype, struct nlattr *head,
124 int len, struct libbpf_nl 99 int len, struct libbpf_nla_policy *policy);
125 int libbpf_nla_parse_nested(struct nlattr *tb[ 100 int libbpf_nla_parse_nested(struct nlattr *tb[], int maxtype,
126 struct nlattr *nla 101 struct nlattr *nla,
127 struct libbpf_nla_ 102 struct libbpf_nla_policy *policy);
128 103
129 int libbpf_nla_dump_errormsg(struct nlmsghdr * 104 int libbpf_nla_dump_errormsg(struct nlmsghdr *nlh);
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 } <<
175 105
176 #endif /* __LIBBPF_NLATTR_H */ 106 #endif /* __LIBBPF_NLATTR_H */
177 107
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