interface.c

   1 #include <string.h>
   2 #include <stdlib.h>
   3 #include <stdio.h>
   4
   5 #include "netifd.h"
   6 #include "ubus.h"
   7
   8 LIST_HEAD(interfaces);
   9
  10 static void
  11 clear_interface_errors(struct interface *iface)
  12 {
  13         struct interface_error *error, *tmp;
  14
  15         list_for_each_entry_safe(error, tmp, &iface->errors, list) {
  16                 list_del(&error->list);
  17                 free(error);
  18         }
  19 }
  20
  21 void interface_add_error(struct interface *iface, const char *subsystem,
  22                          const char *code, const char **data, int n_data)
  23 {
  24         struct interface_error *error;
  25         int i, len = 0;
  26         int *datalen;
  27         char *dest;
  28
  29         if (n_data) {
  30                 len = n_data * sizeof(char *);
  31                 datalen = alloca(len);
  32                 for (i = 0; i < n_data; i++) {
  33                         datalen[i] = strlen(data[i]) + 1;
  34                         len += datalen[i];
  35                 }
  36         }
  37
  38         error = calloc(1, sizeof(*error) + sizeof(char *) + len);
  39         if (!error)
  40                 return;
  41
  42         list_add_tail(&error->list, &iface->errors);
  43         error->subsystem = subsystem;
  44         error->code = code;
  45
  46         dest = (char *) &error->data[n_data + 1];
  47         for (i = 0; i < n_data; i++) {
  48                 error->data[i] = dest;
  49                 memcpy(dest, data[i], datalen[i]);
  50                 dest += datalen[i];
  51         }
  52         error->data[n_data] = NULL;
  53 }
  54
  55 static int
  56 interface_event(struct interface *iface, enum interface_event ev)
  57 {
  58         if (!iface->state || !iface->state->event)
  59                 return 0;
  60
  61         return iface->state->event(iface, iface->state, ev);
  62 }
  63
  64 static void
  65 __set_interface_up(struct interface *iface)
  66 {
  67         if (iface->up)
  68                 return;
  69
  70         if (claim_device(iface->main_dev.dev) < 0)
  71                 return;
  72
  73         if (interface_event(iface, IFEV_UP) < 0) {
  74                 release_device(iface->main_dev.dev);
  75                 return;
  76         }
  77
  78         iface->up = true;
  79 }
  80
  81 static void
  82 __set_interface_down(struct interface *iface)
  83 {
  84         clear_interface_errors(iface);
  85
  86         if (!iface->up)
  87                 return;
  88
  89         iface->up = false;
  90         interface_event(iface, IFEV_DOWN);
  91         release_device(iface->main_dev.dev);
  92 }
  93
  94 static void
  95 interface_cb(struct device_user *dep, enum device_event ev)
  96 {
  97         struct interface *iface;
  98         bool new_state;
  99
 100         iface = container_of(dep, struct interface, main_dev);
 101         switch (ev) {
 102         case DEV_EVENT_ADD:
 103                 new_state = true;
 104                 break;
 105         case DEV_EVENT_REMOVE:
 106                 new_state = false;
 107                 break;
 108         default:
 109                 return;
 110         }
 111
 112         if (iface->active == new_state)
 113                 return;
 114
 115         iface->active = new_state;
 116
 117         if (new_state) {
 118                 if (iface->autostart)
 119                         __set_interface_up(iface);
 120         } else
 121                 __set_interface_down(iface);
 122 }
 123
 124 struct interface *
 125 alloc_interface(const char *name)
 126 {
 127         struct interface *iface;
 128
 129         iface = get_interface(name);
 130         if (iface)
 131                 return iface;
 132
 133         iface = calloc(1, sizeof(*iface));
 134         iface->main_dev.cb = interface_cb;
 135         iface->l3_iface = &iface->main_dev;
 136         strncpy(iface->name, name, sizeof(iface->name) - 1);
 137         list_add(&iface->list, &interfaces);
 138         INIT_LIST_HEAD(&iface->errors);
 139
 140         netifd_ubus_add_interface(iface);
 141
 142         return iface;
 143 }
 144
 145 void
 146 free_interface(struct interface *iface)
 147 {
 148         netifd_ubus_remove_interface(iface);
 149         list_del(&iface->list);
 150         if (iface->state && iface->state->free)
 151                 iface->state->free(iface, iface->state);
 152         free(iface);
 153 }
 154
 155 struct interface *
 156 get_interface(const char *name)
 157 {
 158         struct interface *iface;
 159
 160         list_for_each_entry(iface, &interfaces, list) {
 161                 if (!strcmp(iface->name, name))
 162                         return iface;
 163         }
 164         return NULL;
 165 }
 166
 167 void
 168 interface_remove_link(struct interface *iface, struct device *llif)
 169 {
 170         struct device *dev = iface->main_dev.dev;
 171
 172         if (dev && dev->hotplug_ops) {
 173                 dev->hotplug_ops->del(dev, llif);
 174                 return;
 175         }
 176
 177         remove_device_user(&iface->main_dev);
 178 }
 179
 180 int
 181 interface_add_link(struct interface *iface, struct device *llif)
 182 {
 183         struct device *dev = iface->main_dev.dev;
 184
 185         if (dev && dev->hotplug_ops)
 186                 return dev->hotplug_ops->add(dev, llif);
 187
 188         if (iface->main_dev.dev)
 189                 interface_remove_link(iface, NULL);
 190
 191         add_device_user(&iface->main_dev, llif);
 192
 193         return 0;
 194 }
 195
 196 int
 197 set_interface_up(struct interface *iface)
 198 {
 199         iface->autostart = true;
 200
 201         if (!iface->active) {
 202                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 203                 return -1;
 204         }
 205
 206         if (iface->up || !iface->active)
 207                 return -1;
 208
 209         __set_interface_up(iface);
 210         return 0;
 211 }
 212
 213 int
 214 set_interface_down(struct interface *iface)
 215 {
 216         iface->autostart = false;
 217         __set_interface_down(iface);
 218
 219         return 0;
 220 }