iprule.c

   1 /*
   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  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2
   8  * as published by the Free Software Foundation
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15 #include <string.h>
  16 #include <stdlib.h>
  17 #include <stdio.h>
  18 #include <unistd.h>
  19
  20 #include <arpa/inet.h>
  21
  22 #include "netifd.h"
  23 #include "device.h"
  24 #include "interface.h"
  25 #include "iprule.h"
  26 #include "proto.h"
  27 #include "ubus.h"
  28 #include "system.h"
  29
  30 struct vlist_tree iprules;
  31 static bool iprules_flushed = false;
  32 static unsigned int iprules_counter[2];
  33
  34 enum {
  35         RULE_INTERFACE_IN,
  36         RULE_INTERFACE_OUT,
  37         RULE_INVERT,
  38         RULE_SRC,
  39         RULE_DEST,
  40         RULE_PRIORITY,
  41         RULE_TOS,
  42         RULE_FWMARK,
  43         RULE_LOOKUP,
  44         RULE_ACTION,
  45         RULE_GOTO,
  46         __RULE_MAX
  47 };
  48
  49 static const struct blobmsg_policy rule_attr[__RULE_MAX] = {
  50         [RULE_INTERFACE_IN] = { .name = "in", .type = BLOBMSG_TYPE_STRING },
  51         [RULE_INTERFACE_OUT] = { .name = "out", .type = BLOBMSG_TYPE_STRING },
  52         [RULE_INVERT] = { .name = "invert", .type = BLOBMSG_TYPE_BOOL },
  53         [RULE_SRC] = { .name = "src", .type = BLOBMSG_TYPE_STRING },
  54         [RULE_DEST] = { .name = "dest", .type = BLOBMSG_TYPE_STRING },
  55         [RULE_PRIORITY] = { .name = "priority", .type = BLOBMSG_TYPE_INT32 },
  56         [RULE_TOS] = { .name = "tos", .type = BLOBMSG_TYPE_INT32 },
  57         [RULE_FWMARK] = { .name = "mark", .type = BLOBMSG_TYPE_STRING },
  58         [RULE_LOOKUP] = { .name = "lookup", .type = BLOBMSG_TYPE_STRING },
  59         [RULE_ACTION] = { .name = "action", .type = BLOBMSG_TYPE_STRING },
  60         [RULE_GOTO]   = { .name = "goto", .type = BLOBMSG_TYPE_INT32 },
  61 };
  62
  63 const struct config_param_list rule_attr_list = {
  64         .n_params = __RULE_MAX,
  65         .params = rule_attr,
  66 };
  67
  68
  69 static bool
  70 iprule_parse_mark(const char *mark, struct iprule *rule)
  71 {
  72         char *s, *e;
  73         unsigned int n;
  74
  75         if ((s = strchr(mark, '/')) != NULL)
  76                 *s++ = 0;
  77
  78         n = strtoul(mark, &e, 0);
  79
  80         if (e == mark || *e)
  81                 return false;
  82
  83         rule->fwmark = n;
  84         rule->flags |= IPRULE_FWMARK;
  85
  86         if (s) {
  87                 n = strtoul(s, &e, 0);
  88
  89                 if (e == s || *e)
  90                         return false;
  91
  92                 rule->fwmask = n;
  93                 rule->flags |= IPRULE_FWMASK;
  94         }
  95
  96         return true;
  97 }
  98
  99 void
 100 iprule_add(struct blob_attr *attr, bool v6)
 101 {
 102         struct interface *iif = NULL, *oif = NULL;
 103         struct blob_attr *tb[__RULE_MAX], *cur;
 104         struct interface *iface;
 105         struct iprule *rule;
 106         int af = v6 ? AF_INET6 : AF_INET;
 107
 108         blobmsg_parse(rule_attr, __RULE_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
 109
 110         rule = calloc(1, sizeof(*rule));
 111         if (!rule)
 112                 return;
 113
 114         rule->flags = v6 ? IPRULE_INET6 : IPRULE_INET4;
 115         rule->order = iprules_counter[rule->flags]++;
 116
 117         if ((cur = tb[RULE_INVERT]) != NULL)
 118                 rule->invert = blobmsg_get_bool(cur);
 119
 120         if ((cur = tb[RULE_INTERFACE_IN]) != NULL) {
 121                 iif = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
 122
 123                 if (!iif || !iif->l3_dev.dev) {
 124                         DPRINTF("Failed to resolve device of network: %s\n", (char *) blobmsg_data(cur));
 125                         goto error;
 126                 }
 127
 128                 memcpy(rule->in_dev, iif->l3_dev.dev->ifname, sizeof(rule->in_dev));
 129                 rule->flags |= IPRULE_IN;
 130         }
 131
 132         if ((cur = tb[RULE_INTERFACE_OUT]) != NULL) {
 133                 oif = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
 134
 135                 if (!oif || !oif->l3_dev.dev) {
 136                         DPRINTF("Failed to resolve device of network: %s\n", (char *) blobmsg_data(cur));
 137                         goto error;
 138                 }
 139
 140                 memcpy(rule->out_dev, oif->l3_dev.dev->ifname, sizeof(rule->out_dev));
 141                 rule->flags |= IPRULE_OUT;
 142         }
 143
 144         if ((cur = tb[RULE_SRC]) != NULL) {
 145                 if (!parse_ip_and_netmask(af, blobmsg_data(cur), &rule->src_addr, &rule->src_mask)) {
 146                         DPRINTF("Failed to parse rule source: %s\n", (char *) blobmsg_data(cur));
 147                         goto error;
 148                 }
 149                 rule->flags |= IPRULE_SRC;
 150         }
 151
 152         if ((cur = tb[RULE_DEST]) != NULL) {
 153                 if (!parse_ip_and_netmask(af, blobmsg_data(cur), &rule->dest_addr, &rule->dest_mask)) {
 154                         DPRINTF("Failed to parse rule destination: %s\n", (char *) blobmsg_data(cur));
 155                         goto error;
 156                 }
 157                 rule->flags |= IPRULE_DEST;
 158         }
 159
 160         if ((cur = tb[RULE_PRIORITY]) != NULL) {
 161                 rule->priority = blobmsg_get_u32(cur);
 162                 rule->flags |= IPRULE_PRIORITY;
 163         }
 164
 165         if ((cur = tb[RULE_TOS]) != NULL) {
 166                 if ((rule->tos = blobmsg_get_u32(cur)) > 255) {
 167                         DPRINTF("Invalid TOS value: %u\n", blobmsg_get_u32(cur));
 168                         goto error;
 169                 }
 170                 rule->flags |= IPRULE_TOS;
 171         }
 172
 173         if ((cur = tb[RULE_FWMARK]) != NULL) {
 174                 if (!iprule_parse_mark(blobmsg_data(cur), rule)) {
 175                         DPRINTF("Failed to parse rule fwmark: %s\n", (char *) blobmsg_data(cur));
 176                         goto error;
 177                 }
 178                 /* flags set by iprule_parse_mark() */
 179         }
 180
 181         if ((cur = tb[RULE_LOOKUP]) != NULL) {
 182                 if (!system_resolve_rt_table(blobmsg_data(cur), &rule->lookup)) {
 183                         DPRINTF("Failed to parse rule lookup table: %s\n", (char *) blobmsg_data(cur));
 184                         goto error;
 185                 }
 186                 rule->flags |= IPRULE_LOOKUP;
 187         }
 188
 189         if ((cur = tb[RULE_ACTION]) != NULL) {
 190                 if (!system_resolve_iprule_action(blobmsg_data(cur), &rule->action)) {
 191                         DPRINTF("Failed to parse rule action: %s\n", (char *) blobmsg_data(cur));
 192                         goto error;
 193                 }
 194                 rule->flags |= IPRULE_ACTION;
 195         }
 196
 197         if ((cur = tb[RULE_GOTO]) != NULL) {
 198                 rule->gotoid = blobmsg_get_u32(cur);
 199                 rule->flags |= IPRULE_GOTO;
 200         }
 201
 202         /* trigger flush of existing rules when adding first uci rule the first time */
 203         if (!iprules_flushed)
 204         {
 205                 system_flush_iprules();
 206                 iprules_flushed = true;
 207         }
 208
 209         vlist_add(&iprules, &rule->node, &rule->flags);
 210         return;
 211
 212 error:
 213         free(rule);
 214 }
 215
 216 void
 217 iprule_update_start(void)
 218 {
 219         iprules_counter[0] = 1;
 220         iprules_counter[1] = 1;
 221         vlist_update(&iprules);
 222 }
 223
 224 void
 225 iprule_update_complete(void)
 226 {
 227         vlist_flush(&iprules);
 228 }
 229
 230
 231 static int
 232 rule_cmp(const void *k1, const void *k2, void *ptr)
 233 {
 234         return memcmp(k1, k2, sizeof(struct iprule)-offsetof(struct iprule, flags));
 235 }
 236
 237 static void
 238 iprule_update_rule(struct vlist_tree *tree,
 239                    struct vlist_node *node_new, struct vlist_node *node_old)
 240 {
 241         struct iprule *rule_old, *rule_new;
 242
 243         rule_old = container_of(node_old, struct iprule, node);
 244         rule_new = container_of(node_new, struct iprule, node);
 245
 246         if (node_old) {
 247                 system_del_iprule(rule_old);
 248                 free(rule_old);
 249         }
 250
 251         if (node_new)
 252                 system_add_iprule(rule_new);
 253 }
 254
 255 static void __init
 256 iprule_init_list(void)
 257 {
 258         vlist_init(&iprules, rule_cmp, iprule_update_rule);
 259 }