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
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
|
/*
* XFRM (ipsec) expression
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <nftables.h>
#include <erec.h>
#include <expression.h>
#include <xfrm.h>
#include <datatype.h>
#include <gmputil.h>
#include <utils.h>
#include <string.h>
#include <netinet/ip.h>
#include <linux/netfilter.h>
#include <linux/xfrm.h>
#define XFRM_TEMPLATE_BE(__token, __dtype, __len) { \
.token = (__token), \
.dtype = (__dtype), \
.len = (__len), \
.byteorder = BYTEORDER_BIG_ENDIAN, \
}
#define XFRM_TEMPLATE_HE(__token, __dtype, __len) { \
.token = (__token), \
.dtype = (__dtype), \
.len = (__len), \
.byteorder = BYTEORDER_HOST_ENDIAN, \
}
const struct xfrm_template xfrm_templates[] = {
[NFT_XFRM_KEY_DADDR_IP4] = XFRM_TEMPLATE_BE("daddr", &ipaddr_type, 4 * BITS_PER_BYTE),
[NFT_XFRM_KEY_SADDR_IP4] = XFRM_TEMPLATE_BE("saddr", &ipaddr_type, 4 * BITS_PER_BYTE),
[NFT_XFRM_KEY_DADDR_IP6] = XFRM_TEMPLATE_BE("daddr", &ip6addr_type, 16 * BITS_PER_BYTE),
[NFT_XFRM_KEY_SADDR_IP6] = XFRM_TEMPLATE_BE("saddr", &ip6addr_type, 16 * BITS_PER_BYTE),
[NFT_XFRM_KEY_REQID] = XFRM_TEMPLATE_HE("reqid", &integer_type, 4 * BITS_PER_BYTE),
[NFT_XFRM_KEY_SPI] = XFRM_TEMPLATE_BE("spi", &integer_type, 4 * BITS_PER_BYTE),
};
static void xfrm_expr_print(const struct expr *expr, struct output_ctx *octx)
{
switch (expr->xfrm.direction) {
case XFRM_POLICY_IN:
nft_print(octx, "ipsec in");
break;
case XFRM_POLICY_OUT:
nft_print(octx, "ipsec out");
break;
default:
nft_print(octx, "ipsec (unknown dir %d)", expr->xfrm.direction);
break;
}
if (expr->xfrm.spnum)
nft_print(octx, " spnum %u", expr->xfrm.spnum);
switch (expr->xfrm.key) {
case NFT_XFRM_KEY_DADDR_IP4:
case NFT_XFRM_KEY_SADDR_IP4:
nft_print(octx, " ip");
break;
case NFT_XFRM_KEY_DADDR_IP6:
case NFT_XFRM_KEY_SADDR_IP6:
nft_print(octx, " ip6");
break;
case NFT_XFRM_KEY_REQID:
case NFT_XFRM_KEY_SPI:
break;
default:
nft_print(octx, " (unknown key 0x%x)", expr->xfrm.key);
return;
}
nft_print(octx, " %s", xfrm_templates[expr->xfrm.key].token);
}
static bool xfrm_expr_cmp(const struct expr *e1, const struct expr *e2)
{
return e1->xfrm.key == e2->xfrm.key &&
e1->xfrm.direction == e2->xfrm.direction &&
e1->xfrm.spnum == e2->xfrm.spnum;
}
static void xfrm_expr_clone(struct expr *new, const struct expr *expr)
{
memcpy(&new->xfrm, &expr->xfrm, sizeof(new->xfrm));
}
#define NFTNL_UDATA_XFRM_KEY 0
#define NFTNL_UDATA_XFRM_SPNUM 1
#define NFTNL_UDATA_XFRM_DIR 2
#define NFTNL_UDATA_XFRM_MAX 3
static int xfrm_expr_build_udata(struct nftnl_udata_buf *udbuf,
const struct expr *expr)
{
nftnl_udata_put_u32(udbuf, NFTNL_UDATA_XFRM_KEY, expr->xfrm.key);
nftnl_udata_put_u32(udbuf, NFTNL_UDATA_XFRM_SPNUM, expr->xfrm.spnum);
nftnl_udata_put_u32(udbuf, NFTNL_UDATA_XFRM_DIR, expr->xfrm.direction);
return 0;
}
static int xfrm_parse_udata(const struct nftnl_udata *attr, void *data)
{
const struct nftnl_udata **ud = data;
uint8_t type = nftnl_udata_type(attr);
uint8_t len = nftnl_udata_len(attr);
switch (type) {
case NFTNL_UDATA_XFRM_KEY:
case NFTNL_UDATA_XFRM_SPNUM:
case NFTNL_UDATA_XFRM_DIR:
if (len != sizeof(uint32_t))
return -1;
break;
default:
return 0;
}
ud[type] = attr;
return 0;
}
static struct expr *xfrm_expr_parse_udata(const struct nftnl_udata *attr)
{
const struct nftnl_udata *ud[NFTNL_UDATA_XFRM_MAX + 1] = {};
uint32_t key, dir, spnum;
int err;
err = nftnl_udata_parse(nftnl_udata_get(attr), nftnl_udata_len(attr),
xfrm_parse_udata, ud);
if (err < 0)
return NULL;
if (!ud[NFTNL_UDATA_XFRM_KEY] ||
!ud[NFTNL_UDATA_XFRM_DIR] ||
!ud[NFTNL_UDATA_XFRM_SPNUM])
return NULL;
key = nftnl_udata_get_u32(ud[NFTNL_UDATA_XFRM_KEY]);
dir = nftnl_udata_get_u32(ud[NFTNL_UDATA_XFRM_DIR]);
spnum = nftnl_udata_get_u32(ud[NFTNL_UDATA_XFRM_SPNUM]);
return xfrm_expr_alloc(&internal_location, dir, spnum, key);
}
const struct expr_ops xfrm_expr_ops = {
.type = EXPR_XFRM,
.name = "xfrm",
.print = xfrm_expr_print,
.json = xfrm_expr_json,
.cmp = xfrm_expr_cmp,
.clone = xfrm_expr_clone,
.parse_udata = xfrm_expr_parse_udata,
.build_udata = xfrm_expr_build_udata,
};
struct expr *xfrm_expr_alloc(const struct location *loc,
uint8_t direction,
uint8_t spnum,
enum nft_xfrm_keys key)
{
struct expr *expr;
expr = expr_alloc(loc, EXPR_XFRM,
xfrm_templates[key].dtype,
xfrm_templates[key].byteorder,
xfrm_templates[key].len);
expr->xfrm.direction = direction;
expr->xfrm.spnum = spnum;
expr->xfrm.key = key;
return expr;
}
|
