libnftnl 1.2.6
ct_timeout.c
1/*
2 * (C) 2018 by Harsha Sharma <harshasharmaiitr@gmail.com>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published
6 * by the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 */
9
10#include <stdio.h>
11#include <stdint.h>
12#include <arpa/inet.h>
13#include <errno.h>
14#include <inttypes.h>
15
16#include <linux/netfilter/nf_tables.h>
17
18#include "internal.h"
19#include <libmnl/libmnl.h>
20#include <libnftnl/object.h>
21
22#include "obj.h"
23
24static const char *const tcp_state_to_name[] = {
25 [NFTNL_CTTIMEOUT_TCP_SYN_SENT] = "SYN_SENT",
26 [NFTNL_CTTIMEOUT_TCP_SYN_RECV] = "SYN_RECV",
27 [NFTNL_CTTIMEOUT_TCP_ESTABLISHED] = "ESTABLISHED",
28 [NFTNL_CTTIMEOUT_TCP_FIN_WAIT] = "FIN_WAIT",
29 [NFTNL_CTTIMEOUT_TCP_CLOSE_WAIT] = "CLOSE_WAIT",
30 [NFTNL_CTTIMEOUT_TCP_LAST_ACK] = "LAST_ACK",
31 [NFTNL_CTTIMEOUT_TCP_TIME_WAIT] = "TIME_WAIT",
32 [NFTNL_CTTIMEOUT_TCP_CLOSE] = "CLOSE",
33 [NFTNL_CTTIMEOUT_TCP_SYN_SENT2] = "SYN_SENT2",
34 [NFTNL_CTTIMEOUT_TCP_RETRANS] = "RETRANS",
35 [NFTNL_CTTIMEOUT_TCP_UNACK] = "UNACKNOWLEDGED",
36};
37
38static uint32_t tcp_dflt_timeout[] = {
39 [NFTNL_CTTIMEOUT_TCP_SYN_SENT] = 120,
40 [NFTNL_CTTIMEOUT_TCP_SYN_RECV] = 60,
41 [NFTNL_CTTIMEOUT_TCP_ESTABLISHED] = 432000,
42 [NFTNL_CTTIMEOUT_TCP_FIN_WAIT] = 120,
43 [NFTNL_CTTIMEOUT_TCP_CLOSE_WAIT] = 60,
44 [NFTNL_CTTIMEOUT_TCP_LAST_ACK] = 30,
45 [NFTNL_CTTIMEOUT_TCP_TIME_WAIT] = 120,
46 [NFTNL_CTTIMEOUT_TCP_CLOSE] = 10,
47 [NFTNL_CTTIMEOUT_TCP_SYN_SENT2] = 120,
48 [NFTNL_CTTIMEOUT_TCP_RETRANS] = 300,
49 [NFTNL_CTTIMEOUT_TCP_UNACK] = 300,
50};
51
52static const char *const udp_state_to_name[] = {
53 [NFTNL_CTTIMEOUT_UDP_UNREPLIED] = "UNREPLIED",
54 [NFTNL_CTTIMEOUT_UDP_REPLIED] = "REPLIED",
55};
56
57static uint32_t udp_dflt_timeout[] = {
58 [NFTNL_CTTIMEOUT_UDP_UNREPLIED] = 30,
59 [NFTNL_CTTIMEOUT_UDP_REPLIED] = 180,
60};
61
62static struct {
63 uint32_t attr_max;
64 const char *const *state_to_name;
65 uint32_t *dflt_timeout;
66} timeout_protocol[IPPROTO_MAX] = {
67 [IPPROTO_TCP] = {
68 .attr_max = NFTNL_CTTIMEOUT_TCP_MAX,
69 .state_to_name = tcp_state_to_name,
70 .dflt_timeout = tcp_dflt_timeout,
71 },
72 [IPPROTO_UDP] = {
73 .attr_max = NFTNL_CTTIMEOUT_UDP_MAX,
74 .state_to_name = udp_state_to_name,
75 .dflt_timeout = udp_dflt_timeout,
76 },
77};
78
80 unsigned int nlattr_max;
81 void *tb;
82};
83
84static int
85nftnl_timeout_policy_attr_set_u32(struct nftnl_obj *e,
86 uint32_t type, uint32_t data)
87{
88 struct nftnl_obj_ct_timeout *t = nftnl_obj_data(e);
89
90 if (type >= NFTNL_CTTIMEOUT_ARRAY_MAX)
91 return -1;
92
93 t->timeout[type] = data;
94
95 if (!(e->flags & (1 << NFTNL_OBJ_CT_TIMEOUT_ARRAY)))
96 e->flags |= (1 << NFTNL_OBJ_CT_TIMEOUT_ARRAY);
97
98 return 0;
99}
100
101static int
102parse_timeout_attr_policy_cb(const struct nlattr *attr, void *data)
103{
104 struct _container_policy_cb *data_cb = data;
105 const struct nlattr **tb = data_cb->tb;
106 uint16_t type = mnl_attr_get_type(attr);
107
108 if (mnl_attr_type_valid(attr, data_cb->nlattr_max) < 0)
109 return MNL_CB_OK;
110
111 if (type > 0 && type <= data_cb->nlattr_max) {
112 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
113 abi_breakage();
114 tb[type - 1] = attr;
115 }
116 return MNL_CB_OK;
117}
118
119static int
120timeout_parse_attr_data(struct nftnl_obj *e,
121 const struct nlattr *nest)
122{
123 struct nftnl_obj_ct_timeout *t = nftnl_obj_data(e);
124 unsigned int attr_max = timeout_protocol[t->l4proto].attr_max;
125 struct nlattr *tb[attr_max];
126 struct _container_policy_cb cnt = {
127 .nlattr_max = attr_max,
128 .tb = tb,
129 };
130 unsigned int i;
131
132 memset(tb, 0, sizeof(struct nlattr *) * attr_max);
133
134 if (mnl_attr_parse_nested(nest, parse_timeout_attr_policy_cb, &cnt) < 0)
135 return -1;
136
137 for (i = 0; i < array_size(tb); i++) {
138 if (tb[i]) {
139 nftnl_timeout_policy_attr_set_u32(e, i,
140 ntohl(mnl_attr_get_u32(tb[i])));
141 }
142 }
143 return 0;
144}
145
146static int nftnl_obj_ct_timeout_set(struct nftnl_obj *e, uint16_t type,
147 const void *data, uint32_t data_len)
148{
149 struct nftnl_obj_ct_timeout *timeout = nftnl_obj_data(e);
150
151 switch (type) {
152 case NFTNL_OBJ_CT_TIMEOUT_L3PROTO:
153 memcpy(&timeout->l3proto, data, sizeof(timeout->l3proto));
154 break;
155 case NFTNL_OBJ_CT_TIMEOUT_L4PROTO:
156 memcpy(&timeout->l4proto, data, sizeof(timeout->l4proto));
157 break;
158 case NFTNL_OBJ_CT_TIMEOUT_ARRAY:
159 memcpy(timeout->timeout, data,
160 sizeof(uint32_t) * NFTNL_CTTIMEOUT_ARRAY_MAX);
161 break;
162 default:
163 return -1;
164 }
165 return 0;
166}
167
168static const void *nftnl_obj_ct_timeout_get(const struct nftnl_obj *e,
169 uint16_t type, uint32_t *data_len)
170{
171 struct nftnl_obj_ct_timeout *timeout = nftnl_obj_data(e);
172
173 switch (type) {
174 case NFTNL_OBJ_CT_TIMEOUT_L3PROTO:
175 *data_len = sizeof(timeout->l3proto);
176 return &timeout->l3proto;
177 case NFTNL_OBJ_CT_TIMEOUT_L4PROTO:
178 *data_len = sizeof(timeout->l4proto);
179 return &timeout->l4proto;
180 case NFTNL_OBJ_CT_TIMEOUT_ARRAY:
181 *data_len = sizeof(uint32_t) * NFTNL_CTTIMEOUT_ARRAY_MAX;
182 return timeout->timeout;
183 }
184 return NULL;
185}
186
187static int nftnl_obj_ct_timeout_cb(const struct nlattr *attr, void *data)
188{
189 int type = mnl_attr_get_type(attr);
190 const struct nlattr **tb = data;
191
192 if (mnl_attr_type_valid(attr, NFTA_CT_TIMEOUT_MAX) < 0)
193 return MNL_CB_OK;
194
195 switch (type) {
196 case NFTA_CT_TIMEOUT_L3PROTO:
197 if (mnl_attr_validate(attr, MNL_TYPE_U16) < 0)
198 abi_breakage();
199 break;
200 case NFTA_CT_TIMEOUT_L4PROTO:
201 if (mnl_attr_validate(attr, MNL_TYPE_U8) < 0)
202 abi_breakage();
203 break;
204 case NFTA_CT_TIMEOUT_DATA:
205 if (mnl_attr_validate(attr, MNL_TYPE_NESTED) < 0)
206 abi_breakage();
207 break;
208 }
209
210 tb[type] = attr;
211 return MNL_CB_OK;
212}
213
214static void
215nftnl_obj_ct_timeout_build(struct nlmsghdr *nlh, const struct nftnl_obj *e)
216{
217 struct nftnl_obj_ct_timeout *timeout = nftnl_obj_data(e);
218 struct nlattr *nest;
219
220 if (e->flags & (1 << NFTNL_OBJ_CT_TIMEOUT_L3PROTO))
221 mnl_attr_put_u16(nlh, NFTA_CT_TIMEOUT_L3PROTO, htons(timeout->l3proto));
222 if (e->flags & (1 << NFTNL_OBJ_CT_TIMEOUT_L4PROTO))
223 mnl_attr_put_u8(nlh, NFTA_CT_TIMEOUT_L4PROTO, timeout->l4proto);
224 if (e->flags & (1 << NFTNL_OBJ_CT_TIMEOUT_ARRAY)) {
225 int i;
226
227 nest = mnl_attr_nest_start(nlh, NFTA_CT_TIMEOUT_DATA);
228 for (i = 0; i < timeout_protocol[timeout->l4proto].attr_max; i++)
229 mnl_attr_put_u32(nlh, i+1, htonl(timeout->timeout[i]));
230
231 mnl_attr_nest_end(nlh, nest);
232 }
233}
234
235static int
236nftnl_obj_ct_timeout_parse(struct nftnl_obj *e, struct nlattr *attr)
237{
238 struct nftnl_obj_ct_timeout *timeout = nftnl_obj_data(e);
239 struct nlattr *tb[NFTA_CT_TIMEOUT_MAX + 1] = {};
240
241 if (mnl_attr_parse_nested(attr, nftnl_obj_ct_timeout_cb, tb) < 0)
242 return -1;
243
244 if (tb[NFTA_CT_TIMEOUT_L3PROTO]) {
245 timeout->l3proto = ntohs(mnl_attr_get_u16(tb[NFTA_CT_TIMEOUT_L3PROTO]));
246 e->flags |= (1 << NFTNL_OBJ_CT_TIMEOUT_L3PROTO);
247 }
248 if (tb[NFTA_CT_TIMEOUT_L4PROTO]) {
249 timeout->l4proto = mnl_attr_get_u8(tb[NFTA_CT_TIMEOUT_L4PROTO]);
250 e->flags |= (1 << NFTNL_OBJ_CT_TIMEOUT_L4PROTO);
251 }
252 if (tb[NFTA_CT_TIMEOUT_DATA]) {
253 if (timeout_parse_attr_data(e, tb[NFTA_CT_TIMEOUT_DATA]) < 0)
254 return -1;
255 e->flags |= (1 << NFTNL_OBJ_CT_TIMEOUT_ARRAY);
256 }
257 return 0;
258}
259
260static int nftnl_obj_ct_timeout_snprintf(char *buf, size_t remain,
261 uint32_t flags,
262 const struct nftnl_obj *e)
263{
264 int ret = 0, offset = 0;
265
266 struct nftnl_obj_ct_timeout *timeout = nftnl_obj_data(e);
267
268 if (e->flags & (1 << NFTNL_OBJ_CT_TIMEOUT_L3PROTO)) {
269 ret = snprintf(buf + offset, remain, "family %d ",
270 timeout->l3proto);
271 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
272 }
273 if (e->flags & (1 << NFTNL_OBJ_CT_TIMEOUT_L4PROTO)) {
274 ret = snprintf(buf + offset, remain, "protocol %d ",
275 timeout->l4proto);
276 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
277 }
278 if (e->flags & (1 << NFTNL_OBJ_CT_TIMEOUT_ARRAY)) {
279 uint8_t l4num = timeout->l4proto;
280 int i;
281
282 /* default to generic protocol tracker. */
283 if (timeout_protocol[timeout->l4proto].attr_max == 0)
284 l4num = IPPROTO_RAW;
285
286 ret = snprintf(buf + offset, remain, "policy = {");
287 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
288
289 for (i = 0; i < timeout_protocol[l4num].attr_max; i++) {
290 const char *state_name =
291 timeout_protocol[l4num].state_to_name[i][0] ?
292 timeout_protocol[l4num].state_to_name[i] :
293 "UNKNOWN";
294
295 if (timeout->timeout[i] != timeout_protocol[l4num].dflt_timeout[i]) {
296 ret = snprintf(buf + offset, remain,
297 "%s = %u,", state_name, timeout->timeout[i]);
298 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
299 }
300 }
301
302 ret = snprintf(buf + offset, remain, "}");
303 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
304 }
305 buf[offset] = '\0';
306
307 return offset;
308}
309
310struct obj_ops obj_ops_ct_timeout = {
311 .name = "ct_timeout",
312 .type = NFT_OBJECT_CT_TIMEOUT,
313 .alloc_len = sizeof(struct nftnl_obj_ct_timeout),
314 .max_attr = NFTA_CT_TIMEOUT_MAX,
315 .set = nftnl_obj_ct_timeout_set,
316 .get = nftnl_obj_ct_timeout_get,
317 .parse = nftnl_obj_ct_timeout_parse,
318 .build = nftnl_obj_ct_timeout_build,
319 .output = nftnl_obj_ct_timeout_snprintf,
320};