summaryrefslogtreecommitdiffstats
path: root/tools/net/ynl/lib/ynl-priv.h
blob: 7491da8e7555dd79db0653ba17d62d685824e1e6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
#ifndef __YNL_C_PRIV_H
#define __YNL_C_PRIV_H 1

#include <stddef.h>
#include <libmnl/libmnl.h>
#include <linux/types.h>

/*
 * YNL internals / low level stuff
 */

/* Generic mnl helper code */

enum ynl_policy_type {
	YNL_PT_REJECT = 1,
	YNL_PT_IGNORE,
	YNL_PT_NEST,
	YNL_PT_FLAG,
	YNL_PT_BINARY,
	YNL_PT_U8,
	YNL_PT_U16,
	YNL_PT_U32,
	YNL_PT_U64,
	YNL_PT_UINT,
	YNL_PT_NUL_STR,
	YNL_PT_BITFIELD32,
};

struct ynl_policy_attr {
	enum ynl_policy_type type;
	unsigned int len;
	const char *name;
	struct ynl_policy_nest *nest;
};

struct ynl_policy_nest {
	unsigned int max_attr;
	struct ynl_policy_attr *table;
};

struct ynl_parse_arg {
	struct ynl_sock *ys;
	struct ynl_policy_nest *rsp_policy;
	void *data;
};

struct ynl_dump_list_type {
	struct ynl_dump_list_type *next;
	unsigned char data[] __attribute__((aligned(8)));
};
extern struct ynl_dump_list_type *YNL_LIST_END;

static inline bool ynl_dump_obj_is_last(void *obj)
{
	unsigned long uptr = (unsigned long)obj;

	uptr -= offsetof(struct ynl_dump_list_type, data);
	return uptr == (unsigned long)YNL_LIST_END;
}

static inline void *ynl_dump_obj_next(void *obj)
{
	unsigned long uptr = (unsigned long)obj;
	struct ynl_dump_list_type *list;

	uptr -= offsetof(struct ynl_dump_list_type, data);
	list = (void *)uptr;
	uptr = (unsigned long)list->next;
	uptr += offsetof(struct ynl_dump_list_type, data);

	return (void *)uptr;
}

struct ynl_ntf_base_type {
	__u16 family;
	__u8 cmd;
	struct ynl_ntf_base_type *next;
	void (*free)(struct ynl_ntf_base_type *ntf);
	unsigned char data[] __attribute__((aligned(8)));
};

extern mnl_cb_t ynl_cb_array[NLMSG_MIN_TYPE];

struct nlmsghdr *
ynl_gemsg_start_req(struct ynl_sock *ys, __u32 id, __u8 cmd, __u8 version);
struct nlmsghdr *
ynl_gemsg_start_dump(struct ynl_sock *ys, __u32 id, __u8 cmd, __u8 version);

int ynl_attr_validate(struct ynl_parse_arg *yarg, const struct nlattr *attr);

int ynl_recv_ack(struct ynl_sock *ys, int ret);
int ynl_cb_null(const struct nlmsghdr *nlh, void *data);

/* YNL specific helpers used by the auto-generated code */

struct ynl_req_state {
	struct ynl_parse_arg yarg;
	mnl_cb_t cb;
	__u32 rsp_cmd;
};

struct ynl_dump_state {
	struct ynl_sock *ys;
	struct ynl_policy_nest *rsp_policy;
	void *first;
	struct ynl_dump_list_type *last;
	size_t alloc_sz;
	mnl_cb_t cb;
	__u32 rsp_cmd;
};

struct ynl_ntf_info {
	struct ynl_policy_nest *policy;
	mnl_cb_t cb;
	size_t alloc_sz;
	void (*free)(struct ynl_ntf_base_type *ntf);
};

int ynl_exec(struct ynl_sock *ys, struct nlmsghdr *req_nlh,
	     struct ynl_req_state *yrs);
int ynl_exec_dump(struct ynl_sock *ys, struct nlmsghdr *req_nlh,
		  struct ynl_dump_state *yds);

void ynl_error_unknown_notification(struct ynl_sock *ys, __u8 cmd);
int ynl_error_parse(struct ynl_parse_arg *yarg, const char *msg);

#ifndef MNL_HAS_AUTO_SCALARS
static inline uint64_t mnl_attr_get_uint(const struct nlattr *attr)
{
	if (mnl_attr_get_payload_len(attr) == 4)
		return mnl_attr_get_u32(attr);
	return mnl_attr_get_u64(attr);
}

static inline void
mnl_attr_put_uint(struct nlmsghdr *nlh, uint16_t type, uint64_t data)
{
	if ((uint32_t)data == (uint64_t)data)
		return mnl_attr_put_u32(nlh, type, data);
	return mnl_attr_put_u64(nlh, type, data);
}
#endif
#endif