vlan.c

   1 #include <string.h>
   2 #include <stdlib.h>
   3 #include <stdio.h>
   4
   5 #include "netifd.h"
   6 #include "system.h"
   7
   8 struct vlan_device {
   9         struct device dev;
  10         struct device_user dep;
  11
  12         device_state_cb set_state;
  13         int id;
  14 };
  15
  16 static void free_vlan_if(struct device *iface)
  17 {
  18         struct vlan_device *vldev;
  19
  20         vldev = container_of(iface, struct vlan_device, dev);
  21         device_remove_user(&vldev->dep);
  22         device_cleanup(&vldev->dev);
  23         free(vldev);
  24 }
  25
  26 static int vlan_set_device_state(struct device *dev, bool up)
  27 {
  28         struct vlan_device *vldev;
  29         int ret = 0;
  30
  31         vldev = container_of(dev, struct vlan_device, dev);
  32         if (!up) {
  33                 vldev->set_state(dev, false);
  34                 system_vlan_del(dev);
  35                 device_release(&vldev->dep);
  36                 return 0;
  37         }
  38
  39         ret = device_claim(&vldev->dep);
  40         if (ret)
  41                 return ret;
  42
  43         system_vlan_add(vldev->dep.dev, vldev->id);
  44         ret = vldev->set_state(dev, true);
  45         if (ret)
  46                 device_release(&vldev->dep);
  47
  48         return ret;
  49 }
  50
  51 static void vlan_dev_cb(struct device_user *dep, enum device_event ev)
  52 {
  53         struct vlan_device *vldev;
  54
  55         vldev = container_of(dep, struct vlan_device, dep);
  56         switch(ev) {
  57         case DEV_EVENT_ADD:
  58                 device_set_present(&vldev->dev, true);
  59                 break;
  60         case DEV_EVENT_REMOVE:
  61                 device_set_present(&vldev->dev, false);
  62                 break;
  63         default:
  64                 break;
  65         }
  66 }
  67
  68 static struct device *get_vlan_device(struct device *dev, int id, bool create)
  69 {
  70         static const struct device_type vlan_type = {
  71                 .name = "VLAN",
  72                 .config_params = &device_attr_list,
  73                 .free = free_vlan_if,
  74         };
  75         struct vlan_device *vldev;
  76         struct device_user *dep;
  77
  78         /* look for an existing interface before creating a new one */
  79         list_for_each_entry(dep, &dev->users, list) {
  80                 if (dep->cb != vlan_dev_cb)
  81                         continue;
  82
  83                 vldev = container_of(dep, struct vlan_device, dep);
  84                 if (vldev->id != id)
  85                         continue;
  86
  87                 return &vldev->dev;
  88         }
  89
  90         if (!create)
  91                 return NULL;
  92
  93         vldev = calloc(1, sizeof(*vldev));
  94         snprintf(vldev->dev.ifname, IFNAMSIZ, "%s.%d", dev->ifname, id);
  95
  96         device_init(&vldev->dev, &vlan_type, NULL);
  97
  98         vldev->set_state = vldev->dev.set_state;
  99         vldev->dev.set_state = vlan_set_device_state;
 100
 101         vldev->id = id;
 102
 103         vldev->dep.cb = vlan_dev_cb;
 104         device_add_user(&vldev->dep, dev);
 105
 106         return &vldev->dev;
 107 }
 108
 109 static char *split_vlan(char *s)
 110 {
 111         s = strchr(s, '.');
 112         if (!s)
 113                 goto out;
 114
 115         *s = 0;
 116         s++;
 117
 118 out:
 119         return s;
 120 }
 121
 122 struct device *get_vlan_device_chain(const char *ifname, bool create)
 123 {
 124         struct device *dev = NULL;
 125         char *buf, *s, *next, *err = NULL;
 126         int id;
 127
 128         buf = strdup(ifname);
 129         if (!buf)
 130                 return NULL;
 131
 132         s = split_vlan(buf);
 133         dev = device_get(buf, create);
 134         if (!dev && !create)
 135                 goto error;
 136
 137         do {
 138                 next = split_vlan(s);
 139                 id = strtoul(s, &err, 10);
 140                 if (err && *err)
 141                         goto error;
 142
 143                 dev = get_vlan_device(dev, id, create);
 144                 if (!dev)
 145                         goto error;
 146
 147                 s = next;
 148                 if (!s)
 149                         goto out;
 150         } while (1);
 151
 152 error:
 153         dev = NULL;
 154 out:
 155         free(buf);
 156         return dev;
 157 }