libnftnl 1.2.9
fib.c
1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * (C) 2016 Red Hat GmbH
4 * Author: Florian Westphal <fw@strlen.de>
5 */
6
7#include <stdio.h>
8#include <stdint.h>
9#include <inttypes.h>
10#include <string.h>
11#include <arpa/inet.h>
12#include <errno.h>
13#include <linux/netfilter/nf_tables.h>
14
15#include "internal.h"
16#include <libmnl/libmnl.h>
17#include <libnftnl/expr.h>
18#include <libnftnl/rule.h>
19
21 uint32_t flags;
22 uint32_t result;
23 enum nft_registers dreg;
24};
25
26static int
27nftnl_expr_fib_set(struct nftnl_expr *e, uint16_t result,
28 const void *data, uint32_t data_len)
29{
30 struct nftnl_expr_fib *fib = nftnl_expr_data(e);
31
32 switch (result) {
33 case NFTNL_EXPR_FIB_RESULT:
34 memcpy(&fib->result, data, data_len);
35 break;
36 case NFTNL_EXPR_FIB_DREG:
37 memcpy(&fib->dreg, data, data_len);
38 break;
39 case NFTNL_EXPR_FIB_FLAGS:
40 memcpy(&fib->flags, data, data_len);
41 break;
42 }
43 return 0;
44}
45
46static const void *
47nftnl_expr_fib_get(const struct nftnl_expr *e, uint16_t result,
48 uint32_t *data_len)
49{
50 struct nftnl_expr_fib *fib = nftnl_expr_data(e);
51
52 switch (result) {
53 case NFTNL_EXPR_FIB_RESULT:
54 *data_len = sizeof(fib->result);
55 return &fib->result;
56 case NFTNL_EXPR_FIB_DREG:
57 *data_len = sizeof(fib->dreg);
58 return &fib->dreg;
59 case NFTNL_EXPR_FIB_FLAGS:
60 *data_len = sizeof(fib->flags);
61 return &fib->flags;
62 }
63 return NULL;
64}
65
66static int nftnl_expr_fib_cb(const struct nlattr *attr, void *data)
67{
68 const struct nlattr **tb = data;
69 int type = mnl_attr_get_type(attr);
70
71 if (mnl_attr_type_valid(attr, NFTA_FIB_MAX) < 0)
72 return MNL_CB_OK;
73
74 switch (type) {
75 case NFTA_FIB_RESULT:
76 case NFTA_FIB_DREG:
77 case NFTA_FIB_FLAGS:
78 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
79 abi_breakage();
80 break;
81 }
82
83 tb[type] = attr;
84 return MNL_CB_OK;
85}
86
87static void
88nftnl_expr_fib_build(struct nlmsghdr *nlh, const struct nftnl_expr *e)
89{
90 struct nftnl_expr_fib *fib = nftnl_expr_data(e);
91
92 if (e->flags & (1 << NFTNL_EXPR_FIB_FLAGS))
93 mnl_attr_put_u32(nlh, NFTA_FIB_FLAGS, htonl(fib->flags));
94 if (e->flags & (1 << NFTNL_EXPR_FIB_RESULT))
95 mnl_attr_put_u32(nlh, NFTA_FIB_RESULT, htonl(fib->result));
96 if (e->flags & (1 << NFTNL_EXPR_FIB_DREG))
97 mnl_attr_put_u32(nlh, NFTA_FIB_DREG, htonl(fib->dreg));
98}
99
100static int
101nftnl_expr_fib_parse(struct nftnl_expr *e, struct nlattr *attr)
102{
103 struct nftnl_expr_fib *fib = nftnl_expr_data(e);
104 struct nlattr *tb[NFTA_FIB_MAX+1] = {};
105 int ret = 0;
106
107 if (mnl_attr_parse_nested(attr, nftnl_expr_fib_cb, tb) < 0)
108 return -1;
109
110 if (tb[NFTA_FIB_RESULT]) {
111 fib->result = ntohl(mnl_attr_get_u32(tb[NFTA_FIB_RESULT]));
112 e->flags |= (1 << NFTNL_EXPR_FIB_RESULT);
113 }
114 if (tb[NFTA_FIB_DREG]) {
115 fib->dreg = ntohl(mnl_attr_get_u32(tb[NFTA_FIB_DREG]));
116 e->flags |= (1 << NFTNL_EXPR_FIB_DREG);
117 }
118 if (tb[NFTA_FIB_FLAGS]) {
119 fib->flags = ntohl(mnl_attr_get_u32(tb[NFTA_FIB_FLAGS]));
120 e->flags |= (1 << NFTNL_EXPR_FIB_FLAGS);
121 }
122 return ret;
123}
124
125static const char *fib_type[NFT_FIB_RESULT_MAX + 1] = {
126 [NFT_FIB_RESULT_OIF] = "oif",
127 [NFT_FIB_RESULT_OIFNAME] = "oifname",
128 [NFT_FIB_RESULT_ADDRTYPE] = "type",
129};
130
131static const char *fib_type_str(enum nft_fib_result r)
132{
133 if (r <= NFT_FIB_RESULT_MAX)
134 return fib_type[r];
135
136 return "unknown";
137}
138
139static int
140nftnl_expr_fib_snprintf(char *buf, size_t remain,
141 uint32_t printflags, const struct nftnl_expr *e)
142{
143 struct nftnl_expr_fib *fib = nftnl_expr_data(e);
144 uint32_t flags = fib->flags & ~NFTA_FIB_F_PRESENT;
145 uint32_t present_flag = fib->flags & NFTA_FIB_F_PRESENT;
146 int offset = 0, ret, i;
147 static const struct {
148 int bit;
149 const char *name;
150 } tab[] = {
151 { NFTA_FIB_F_SADDR, "saddr" },
152 { NFTA_FIB_F_DADDR, "daddr" },
153 { NFTA_FIB_F_MARK, "mark" },
154 { NFTA_FIB_F_IIF, "iif" },
155 { NFTA_FIB_F_OIF, "oif" },
156 };
157
158 for (i = 0; i < (sizeof(tab) / sizeof(tab[0])); i++) {
159 if (flags & tab[i].bit) {
160 ret = snprintf(buf + offset, remain, "%s ",
161 tab[i].name);
162 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
163
164 flags &= ~tab[i].bit;
165 if (flags) {
166 ret = snprintf(buf + offset, remain, ". ");
167 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
168 }
169 }
170 }
171
172 if (flags) {
173 ret = snprintf(buf + offset, remain, "unknown 0x%" PRIx32,
174 flags);
175 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
176 }
177
178 ret = snprintf(buf + offset, remain, "%s%s => reg %d ",
179 fib_type_str(fib->result),
180 present_flag ? " present" : "",
181 fib->dreg);
182 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
183
184 return offset;
185}
186
187static struct attr_policy fib_attr_policy[__NFTNL_EXPR_FIB_MAX] = {
188 [NFTNL_EXPR_FIB_DREG] = { .maxlen = sizeof(uint32_t) },
189 [NFTNL_EXPR_FIB_RESULT] = { .maxlen = sizeof(uint32_t) },
190 [NFTNL_EXPR_FIB_FLAGS] = { .maxlen = sizeof(uint32_t) },
191};
192
193struct expr_ops expr_ops_fib = {
194 .name = "fib",
195 .alloc_len = sizeof(struct nftnl_expr_fib),
196 .nftnl_max_attr = __NFTNL_EXPR_FIB_MAX - 1,
197 .attr_policy = fib_attr_policy,
198 .set = nftnl_expr_fib_set,
199 .get = nftnl_expr_fib_get,
200 .parse = nftnl_expr_fib_parse,
201 .build = nftnl_expr_fib_build,
202 .output = nftnl_expr_fib_snprintf,
203};