2 * netifd - network interface daemon
3 * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
4 * Copyright (C) 2013 Jo-Philipp Wich <jow@openwrt.org>
5 * Copyright (C) 2018 Alexander Couzens <lynxis@fe80.eu>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2
9 * as published by the Free Software Foundation
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
21 #include <arpa/inet.h>
25 #include "interface.h"
31 struct vlist_tree iprules
;
32 static bool iprules_flushed
= false;
33 static unsigned int iprules_counter
[2];
51 static const struct blobmsg_policy rule_attr
[__RULE_MAX
] = {
52 [RULE_INTERFACE_IN
] = { .name
= "in", .type
= BLOBMSG_TYPE_STRING
},
53 [RULE_INTERFACE_OUT
] = { .name
= "out", .type
= BLOBMSG_TYPE_STRING
},
54 [RULE_INVERT
] = { .name
= "invert", .type
= BLOBMSG_TYPE_BOOL
},
55 [RULE_SRC
] = { .name
= "src", .type
= BLOBMSG_TYPE_STRING
},
56 [RULE_DEST
] = { .name
= "dest", .type
= BLOBMSG_TYPE_STRING
},
57 [RULE_PRIORITY
] = { .name
= "priority", .type
= BLOBMSG_TYPE_INT32
},
58 [RULE_TOS
] = { .name
= "tos", .type
= BLOBMSG_TYPE_INT32
},
59 [RULE_FWMARK
] = { .name
= "mark", .type
= BLOBMSG_TYPE_STRING
},
60 [RULE_LOOKUP
] = { .name
= "lookup", .type
= BLOBMSG_TYPE_STRING
},
61 [RULE_SUP_PREFIXLEN
] = { .name
= "suppress_prefixlength", .type
= BLOBMSG_TYPE_INT32
},
62 [RULE_ACTION
] = { .name
= "action", .type
= BLOBMSG_TYPE_STRING
},
63 [RULE_GOTO
] = { .name
= "goto", .type
= BLOBMSG_TYPE_INT32
},
66 const struct uci_blob_param_list rule_attr_list
= {
67 .n_params
= __RULE_MAX
,
71 /* interface based rules are dynamic. */
72 static bool rule_ready(struct iprule
*rule
) {
73 if (rule
->flags
& IPRULE_OUT
&& rule
->out_dev
== NULL
)
76 if (rule
->flags
& IPRULE_IN
&& rule
->in_dev
== NULL
)
83 iprule_parse_mark(const char *mark
, struct iprule
*rule
)
88 if ((s
= strchr(mark
, '/')) != NULL
)
91 n
= strtoul(mark
, &e
, 0);
97 rule
->flags
|= IPRULE_FWMARK
;
100 n
= strtoul(s
, &e
, 0);
106 rule
->flags
|= IPRULE_FWMASK
;
112 /* called on interface changes of the incoming interface */
113 static void rule_in_cb(
114 struct interface_user
*dep
,
115 struct interface
*iface
,
116 enum interface_event ev
)
118 struct iprule
*rule
= container_of(dep
, struct iprule
, in_iface_user
);
122 if (!iface
->l3_dev
.dev
)
124 memcpy(rule
->in_dev
, iface
->l3_dev
.dev
->ifname
, sizeof(rule
->in_dev
));
125 if (rule_ready(rule
))
126 system_add_iprule(rule
);
131 if (rule_ready(rule
))
132 system_del_iprule(rule
);
140 /* called on interface changes of the outgoing interface */
141 static void rule_out_cb(
142 struct interface_user
*dep
,
143 struct interface
*iface
,
144 enum interface_event ev
)
146 struct iprule
*rule
= container_of(dep
, struct iprule
, out_iface_user
);
150 if (!iface
->l3_dev
.dev
)
152 memcpy(rule
->out_dev
, iface
->l3_dev
.dev
->ifname
, sizeof(rule
->out_dev
));
153 if (rule_ready(rule
))
154 system_add_iprule(rule
);
159 if (rule_ready(rule
))
160 system_del_iprule(rule
);
161 rule
->out_dev
[0] = 0;
168 /* called on all interface events */
169 static void generic_interface_cb(
170 struct interface_user
*dep
,
171 struct interface
*iface
,
172 enum interface_event ev
)
176 if (ev
!= IFEV_CREATE
)
179 /* add new interfaces to rules */
180 vlist_for_each_element(&iprules
, rule
, node
) {
181 if (rule_ready(rule
))
184 if (!strcmp(rule
->out_iface
, iface
->name
)) {
185 assert(!rule
->out_dev
);
186 memcpy(rule
->out_dev
, iface
->l3_dev
.dev
->ifname
, sizeof(rule
->out_dev
));
187 interface_add_user(&rule
->out_iface_user
, iface
);
190 if (!strcmp(rule
->in_iface
, iface
->name
)) {
191 assert(!rule
->in_dev
);
192 memcpy(rule
->in_dev
, iface
->l3_dev
.dev
->ifname
, sizeof(rule
->in_dev
));
193 interface_add_user(&rule
->in_iface_user
, iface
);
198 struct interface_user generic_listener
= {
199 .cb
= generic_interface_cb
203 iprule_add(struct blob_attr
*attr
, bool v6
)
205 struct blob_attr
*tb
[__RULE_MAX
], *cur
;
208 int af
= v6
? AF_INET6
: AF_INET
;
210 blobmsg_parse(rule_attr
, __RULE_MAX
, tb
, blobmsg_data(attr
), blobmsg_data_len(attr
));
212 rule
= calloc(1, sizeof(*rule
));
216 rule
->flags
= v6
? IPRULE_INET6
: IPRULE_INET4
;
217 rule
->order
= iprules_counter
[rule
->flags
]++;
219 if ((cur
= tb
[RULE_INVERT
]) != NULL
)
220 rule
->invert
= blobmsg_get_bool(cur
);
222 if ((cur
= tb
[RULE_INTERFACE_IN
]) != NULL
) {
223 iface_name
= calloc(1, strlen(blobmsg_data(cur
)) + 1);
224 rule
->in_iface
= strcpy(iface_name
, blobmsg_data(cur
));
225 rule
->in_iface_user
.cb
= &rule_in_cb
;
226 rule
->flags
|= IPRULE_IN
;
229 if ((cur
= tb
[RULE_INTERFACE_OUT
]) != NULL
) {
230 iface_name
= calloc(1, strlen(blobmsg_data(cur
)) + 1);
231 rule
->out_iface
= strcpy(iface_name
, blobmsg_data(cur
));
232 rule
->out_iface_user
.cb
= &rule_out_cb
;
233 rule
->flags
|= IPRULE_OUT
;
236 if ((cur
= tb
[RULE_SRC
]) != NULL
) {
237 if (!parse_ip_and_netmask(af
, blobmsg_data(cur
), &rule
->src_addr
, &rule
->src_mask
)) {
238 DPRINTF("Failed to parse rule source: %s\n", (char *) blobmsg_data(cur
));
241 rule
->flags
|= IPRULE_SRC
;
244 if ((cur
= tb
[RULE_DEST
]) != NULL
) {
245 if (!parse_ip_and_netmask(af
, blobmsg_data(cur
), &rule
->dest_addr
, &rule
->dest_mask
)) {
246 DPRINTF("Failed to parse rule destination: %s\n", (char *) blobmsg_data(cur
));
249 rule
->flags
|= IPRULE_DEST
;
252 if ((cur
= tb
[RULE_PRIORITY
]) != NULL
) {
253 rule
->priority
= blobmsg_get_u32(cur
);
254 rule
->flags
|= IPRULE_PRIORITY
;
257 if ((cur
= tb
[RULE_TOS
]) != NULL
) {
258 if ((rule
->tos
= blobmsg_get_u32(cur
)) > 255) {
259 DPRINTF("Invalid TOS value: %u\n", blobmsg_get_u32(cur
));
262 rule
->flags
|= IPRULE_TOS
;
265 if ((cur
= tb
[RULE_FWMARK
]) != NULL
) {
266 if (!iprule_parse_mark(blobmsg_data(cur
), rule
)) {
267 DPRINTF("Failed to parse rule fwmark: %s\n", (char *) blobmsg_data(cur
));
270 /* flags set by iprule_parse_mark() */
273 if ((cur
= tb
[RULE_LOOKUP
]) != NULL
) {
274 if (!system_resolve_rt_table(blobmsg_data(cur
), &rule
->lookup
)) {
275 DPRINTF("Failed to parse rule lookup table: %s\n", (char *) blobmsg_data(cur
));
278 rule
->flags
|= IPRULE_LOOKUP
;
281 if ((cur
= tb
[RULE_SUP_PREFIXLEN
]) != NULL
) {
282 rule
->sup_prefixlen
= blobmsg_get_u32(cur
);
283 rule
->flags
|= IPRULE_SUP_PREFIXLEN
;
286 if ((cur
= tb
[RULE_ACTION
]) != NULL
) {
287 if (!system_resolve_iprule_action(blobmsg_data(cur
), &rule
->action
)) {
288 DPRINTF("Failed to parse rule action: %s\n", (char *) blobmsg_data(cur
));
291 rule
->flags
|= IPRULE_ACTION
;
294 if ((cur
= tb
[RULE_GOTO
]) != NULL
) {
295 rule
->gotoid
= blobmsg_get_u32(cur
);
296 rule
->flags
|= IPRULE_GOTO
;
299 vlist_add(&iprules
, &rule
->node
, &rule
->flags
);
307 iprule_update_start(void)
309 if (!iprules_flushed
) {
310 system_flush_iprules();
311 iprules_flushed
= true;
314 iprules_counter
[0] = 1;
315 iprules_counter
[1] = 1;
316 vlist_update(&iprules
);
320 iprule_update_complete(void)
322 vlist_flush(&iprules
);
327 rule_cmp(const void *k1
, const void *k2
, void *ptr
)
329 return memcmp(k1
, k2
, sizeof(struct iprule
)-offsetof(struct iprule
, flags
));
332 static void deregister_interfaces(struct iprule
*rule
)
334 if (rule
->flags
& IPRULE_IN
&& rule
->in_iface_user
.iface
)
335 interface_remove_user(&rule
->in_iface_user
);
337 if (rule
->flags
& IPRULE_OUT
&& rule
->out_iface_user
.iface
)
338 interface_remove_user(&rule
->out_iface_user
);
341 static void register_interfaces(struct iprule
*rule
)
343 struct interface
*iface
, *tmp
;
345 if (rule
->flags
& IPRULE_IN
) {
346 tmp
= vlist_find(&interfaces
, rule
->in_iface
, iface
, node
);
348 interface_add_user(&rule
->in_iface_user
, tmp
);
350 if (rule
->flags
& IPRULE_OUT
) {
351 tmp
= vlist_find(&interfaces
, rule
->out_iface
, iface
, node
);
353 interface_add_user(&rule
->out_iface_user
, tmp
);
358 iprule_update_rule(struct vlist_tree
*tree
,
359 struct vlist_node
*node_new
, struct vlist_node
*node_old
)
361 struct iprule
*rule_old
, *rule_new
;
363 rule_old
= container_of(node_old
, struct iprule
, node
);
364 rule_new
= container_of(node_new
, struct iprule
, node
);
367 if (rule_ready(rule_old
))
368 system_del_iprule(rule_old
);
370 if (rule_old
->flags
& (IPRULE_IN
| IPRULE_OUT
))
371 deregister_interfaces(rule_old
);
373 if (rule_old
->in_iface
)
374 free(rule_old
->in_iface
);
376 if (rule_old
->out_iface
)
377 free(rule_old
->out_iface
);
383 /* interface based rules calls system_add_iprule over the event cb */
384 if (rule_new
->flags
& (IPRULE_IN
| IPRULE_OUT
)) {
385 register_interfaces(rule_new
);
387 system_add_iprule(rule_new
);
393 iprule_init_list(void)
395 vlist_init(&iprules
, rule_cmp
, iprule_update_rule
);
396 interface_add_user(&generic_listener
, NULL
);