summaryrefslogtreecommitdiffstats
path: root/src/fib.c
blob: 28ef4b50b3ea3f748e169da62d24462ee88d3253 (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
145
146
147
148
/*
 * FIB expression.
 *
 * Copyright (c) Red Hat GmbH.  Author: Florian Westphal <fw@strlen.de>
 *
 * 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 <datatype.h>
#include <gmputil.h>
#include <utils.h>
#include <string.h>
#include <fib.h>

#include <linux/rtnetlink.h>
#include <net/if.h>

static const char *fib_result[NFT_FIB_RESULT_MAX + 1] = {
	[NFT_FIB_RESULT_OIF] = "oif",
	[NFT_FIB_RESULT_OIFNAME] = "oifname",
	[NFT_FIB_RESULT_ADDRTYPE] = "type",
};

static const struct symbol_table addrtype_tbl = {
	.base		= BASE_DECIMAL,
	.symbols	= {
		SYMBOL("unspec",	RTN_UNSPEC),
		SYMBOL("unicast",	RTN_UNICAST),
		SYMBOL("local",		RTN_LOCAL),
		SYMBOL("broadcast",	RTN_BROADCAST),
		SYMBOL("anycast",	RTN_ANYCAST),
		SYMBOL("multicast",	RTN_MULTICAST),
		SYMBOL("blackhole",	RTN_BLACKHOLE),
		SYMBOL("unreachable",	RTN_UNREACHABLE),
		SYMBOL("prohibit",	RTN_PROHIBIT),
		SYMBOL_LIST_END
	}
};

static const struct datatype fib_addr_type = {
	.type		= TYPE_FIB_ADDR,
	.name		= "fib_addrtype",
	.desc		= "fib address type",
	.byteorder	= BYTEORDER_HOST_ENDIAN,
	.size		= 4 * BITS_PER_BYTE,
	.basetype	= &integer_type,
	.sym_tbl	= &addrtype_tbl,
};

static const char *fib_result_str(enum nft_fib_result result)
{
	if (result <= NFT_FIB_RESULT_MAX)
		return fib_result[result];

	return "unknown";
}

static void __fib_expr_print_f(unsigned int *flags, unsigned int f, const char *s)
{
	if ((*flags & f) == 0)
		return;

	printf("%s", s);
	*flags &= ~f;
	if (*flags)
		printf(" . ");
}

static void fib_expr_print(const struct expr *expr)
{
	unsigned int flags = expr->fib.flags & ~NFTA_FIB_F_PRESENT;

	printf("fib ");
	__fib_expr_print_f(&flags, NFTA_FIB_F_SADDR, "saddr");
	__fib_expr_print_f(&flags, NFTA_FIB_F_DADDR, "daddr");
	__fib_expr_print_f(&flags, NFTA_FIB_F_MARK, "mark");
	__fib_expr_print_f(&flags, NFTA_FIB_F_IIF, "iif");
	__fib_expr_print_f(&flags, NFTA_FIB_F_OIF, "oif");

	if (flags)
		printf("0x%x", flags);

	printf(" %s", fib_result_str(expr->fib.result));
}

static bool fib_expr_cmp(const struct expr *e1, const struct expr *e2)
{
	return  e1->fib.result == e2->fib.result &&
		e1->fib.flags == e2->fib.flags;
}

static void fib_expr_clone(struct expr *new, const struct expr *expr)
{
	new->fib.result = expr->fib.result;
	new->fib.flags= expr->fib.flags;
}

static const struct expr_ops fib_expr_ops = {
	.type		= EXPR_FIB,
	.name		= "fib",
	.print		= fib_expr_print,
	.cmp		= fib_expr_cmp,
	.clone		= fib_expr_clone,
};

struct expr *fib_expr_alloc(const struct location *loc,
			    unsigned int flags, unsigned int result)
{
	const struct datatype *type;
	unsigned int len = 4 * BITS_PER_BYTE;
	struct expr *expr;

	switch (result) {
	case NFT_FIB_RESULT_OIF:
		type = &ifindex_type;
		break;
	case NFT_FIB_RESULT_OIFNAME:
		type = &string_type;
		len = IFNAMSIZ * BITS_PER_BYTE;
		break;
	case NFT_FIB_RESULT_ADDRTYPE:
		type = &fib_addr_type;
		break;
	default:
		BUG("Unknown result %d\n", result);
	}

	if (flags & NFTA_FIB_F_PRESENT)
		type = &boolean_type;

	expr = expr_alloc(loc, &fib_expr_ops, type,
			  BYTEORDER_HOST_ENDIAN, len);

	expr->fib.result = result;
	expr->fib.flags	= flags;

	return expr;
}

static void __init fib_init(void)
{
	datatype_register(&fib_addr_type);
}