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
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
|
/*
* Routing expression related definition and types.
*
* Copyright (c) 2016 Anders K. Pedersen <akp@cohaesio.com>
*
* 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 <nft.h>
#include <errno.h>
#include <stddef.h>
#include <stdio.h>
#include <arpa/inet.h>
#include <linux/netfilter.h>
#include <nftables.h>
#include <expression.h>
#include <datatype.h>
#include <rt.h>
#include <rule.h>
#include <json.h>
void realm_table_rt_init(struct nft_ctx *ctx)
{
ctx->output.tbl.realm = rt_symbol_table_init("/etc/iproute2/rt_realms");
}
void realm_table_rt_exit(struct nft_ctx *ctx)
{
rt_symbol_table_free(ctx->output.tbl.realm);
}
static void realm_type_print(const struct expr *expr, struct output_ctx *octx)
{
return symbolic_constant_print(octx->tbl.realm, expr, true, octx);
}
static struct error_record *realm_type_parse(struct parse_ctx *ctx,
const struct expr *sym,
struct expr **res)
{
return symbolic_constant_parse(ctx, sym, ctx->tbl->realm, res);
}
const struct datatype realm_type = {
.type = TYPE_REALM,
.name = "realm",
.desc = "routing realm",
.byteorder = BYTEORDER_HOST_ENDIAN,
.size = 4 * BITS_PER_BYTE,
.basetype = &integer_type,
.print = realm_type_print,
.parse = realm_type_parse,
.flags = DTYPE_F_PREFIX,
};
const struct rt_template rt_templates[] = {
[NFT_RT_CLASSID] = RT_TEMPLATE("classid",
&realm_type,
4 * BITS_PER_BYTE,
BYTEORDER_HOST_ENDIAN,
false),
[NFT_RT_NEXTHOP4] = RT_TEMPLATE("nexthop",
&ipaddr_type,
4 * BITS_PER_BYTE,
BYTEORDER_BIG_ENDIAN,
true),
[NFT_RT_NEXTHOP6] = RT_TEMPLATE("nexthop",
&ip6addr_type,
16 * BITS_PER_BYTE,
BYTEORDER_BIG_ENDIAN,
true),
[NFT_RT_TCPMSS] = RT_TEMPLATE("mtu",
&integer_type,
2 * BITS_PER_BYTE,
BYTEORDER_HOST_ENDIAN,
false),
[NFT_RT_XFRM] = RT_TEMPLATE("ipsec",
&boolean_type,
BITS_PER_BYTE,
BYTEORDER_HOST_ENDIAN,
false),
};
static void rt_expr_print(const struct expr *expr, struct output_ctx *octx)
{
const char *ip = "";
switch (expr->rt.key) {
case NFT_RT_NEXTHOP4:
ip = "ip ";
break;
case NFT_RT_NEXTHOP6:
ip = "ip6 ";
break;
default:
break;
}
nft_print(octx, "rt %s%s", ip, rt_templates[expr->rt.key].token);
}
static bool rt_expr_cmp(const struct expr *e1, const struct expr *e2)
{
return e1->rt.key == e2->rt.key;
}
static void rt_expr_clone(struct expr *new, const struct expr *expr)
{
new->rt.key = expr->rt.key;
}
#define NFTNL_UDATA_RT_KEY 0
#define NFTNL_UDATA_RT_MAX 1
static int rt_expr_build_udata(struct nftnl_udata_buf *udbuf,
const struct expr *expr)
{
nftnl_udata_put_u32(udbuf, NFTNL_UDATA_RT_KEY, expr->rt.key);
return 0;
}
static int rt_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_RT_KEY:
if (len != sizeof(uint32_t))
return -1;
break;
default:
return 0;
}
ud[type] = attr;
return 0;
}
static struct expr *rt_expr_parse_udata(const struct nftnl_udata *attr)
{
const struct nftnl_udata *ud[NFTNL_UDATA_RT_MAX + 1] = {};
uint32_t key;
int err;
err = nftnl_udata_parse(nftnl_udata_get(attr), nftnl_udata_len(attr),
rt_parse_udata, ud);
if (err < 0)
return NULL;
if (!ud[NFTNL_UDATA_RT_KEY])
return NULL;
key = nftnl_udata_get_u32(ud[NFTNL_UDATA_RT_KEY]);
return rt_expr_alloc(&internal_location, key, false);
}
const struct expr_ops rt_expr_ops = {
.type = EXPR_RT,
.name = "rt",
.print = rt_expr_print,
.json = rt_expr_json,
.cmp = rt_expr_cmp,
.clone = rt_expr_clone,
.parse_udata = rt_expr_parse_udata,
.build_udata = rt_expr_build_udata,
};
struct expr *rt_expr_alloc(const struct location *loc, enum nft_rt_keys key,
bool invalid)
{
const struct rt_template *tmpl = &rt_templates[key];
struct expr *expr;
if (invalid && tmpl->invalid)
expr = expr_alloc(loc, EXPR_RT, &invalid_type,
tmpl->byteorder, 0);
else
expr = expr_alloc(loc, EXPR_RT, tmpl->dtype,
tmpl->byteorder, tmpl->len);
expr->rt.key = key;
return expr;
}
void rt_expr_update_type(struct proto_ctx *ctx, struct expr *expr)
{
const struct proto_desc *desc;
switch (expr->rt.key) {
case NFT_RT_NEXTHOP4:
desc = ctx->protocol[PROTO_BASE_NETWORK_HDR].desc;
if (desc == &proto_ip)
datatype_set(expr, &ipaddr_type);
else if (desc == &proto_ip6) {
expr->rt.key++;
datatype_set(expr, &ip6addr_type);
}
expr->len = expr->dtype->size;
break;
default:
break;
}
}
|
