add some code for parsing static ipaddr/ip6addr/netmask
[project/netifd.git] / 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         remove_device_user(&vldev->dep);
22         cleanup_device(&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                 release_device(vldev->dep.dev);
36                 return 0;
37         }
38
39         ret = claim_device(vldev->dep.dev);
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                 release_device(vldev->dep.dev);
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                 set_device_present(&vldev->dev, true);
59                 break;
60         case DEV_EVENT_REMOVE:
61                 set_device_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                 .free = free_vlan_if,
73         };
74         struct vlan_device *vldev;
75         struct device_user *dep;
76
77         /* look for an existing interface before creating a new one */
78         list_for_each_entry(dep, &dev->users, list) {
79                 if (dep->cb != vlan_dev_cb)
80                         continue;
81
82                 vldev = container_of(dep, struct vlan_device, dep);
83                 if (vldev->id != id)
84                         continue;
85
86                 return &vldev->dev;
87         }
88
89         if (!create)
90                 return NULL;
91
92         vldev = calloc(1, sizeof(*vldev));
93         snprintf(vldev->dev.ifname, IFNAMSIZ, "%s.%d", dev->ifname, id);
94
95         init_device(&vldev->dev, &vlan_type, NULL);
96
97         vldev->set_state = vldev->dev.set_state;
98         vldev->dev.set_state = vlan_set_device_state;
99
100         vldev->id = id;
101
102         vldev->dep.cb = vlan_dev_cb;
103         add_device_user(&vldev->dep, dev);
104
105         return &vldev->dev;
106 }
107
108 static char *split_vlan(char *s)
109 {
110         s = strchr(s, '.');
111         if (!s)
112                 goto out;
113
114         *s = 0;
115         s++;
116
117 out:
118         return s;
119 }
120
121 struct device *get_vlan_device_chain(const char *ifname, bool create)
122 {
123         struct device *iface = NULL;
124         char *buf, *s, *next, *err = NULL;
125         int id;
126
127         buf = strdup(ifname);
128         if (!buf)
129                 return NULL;
130
131         s = split_vlan(buf);
132         iface = get_device(buf, create);
133         if (!iface && !create)
134                 goto error;
135
136         do {
137                 next = split_vlan(s);
138                 id = strtoul(s, &err, 10);
139                 if (err && *err)
140                         goto error;
141
142                 iface = get_vlan_device(iface, id, create);
143                 if (!iface)
144                         goto error;
145
146                 s = next;
147                 if (!s)
148                         goto out;
149         } while (1);
150
151 error:
152         iface = NULL;
153 out:
154         free(buf);
155         return iface;
156 }