system-linux.c

   1 #include <sys/socket.h>
   2 #include <sys/ioctl.h>
   3
   4 #include <linux/rtnetlink.h>
   5 #include <linux/sockios.h>
   6 #include <linux/if_vlan.h>
   7
   8 #include <stddef.h>
   9 #include <string.h>
  10 #include <fcntl.h>
  11 #include <errno.h>
  12
  13 #include <netlink/msg.h>
  14
  15 #include "netifd.h"
  16 #include "device.h"
  17 #include "system.h"
  18
  19 static int sock_ioctl = -1;
  20 static struct nl_sock *sock_rtnl = NULL;
  21
  22 int system_init(void)
  23 {
  24         sock_ioctl = socket(AF_LOCAL, SOCK_DGRAM, 0);
  25         fcntl(sock_ioctl, F_SETFD, fcntl(sock_ioctl, F_GETFD) | FD_CLOEXEC);
  26
  27         if ((sock_rtnl = nl_socket_alloc())) {
  28                 if (nl_connect(sock_rtnl, NETLINK_ROUTE)) {
  29                         nl_socket_free(sock_rtnl);
  30                         sock_rtnl = NULL;
  31                 }
  32         }
  33
  34         return -(sock_ioctl < 0 || !sock_rtnl);
  35 }
  36
  37 static int system_rtnl_call(struct nl_msg *msg)
  38 {
  39         int s = -(nl_send_auto_complete(sock_rtnl, msg)
  40                         || nl_wait_for_ack(sock_rtnl));
  41         nlmsg_free(msg);
  42         return s;
  43 }
  44
  45 int system_bridge_addbr(struct device *bridge)
  46 {
  47         return ioctl(sock_ioctl, SIOCBRADDBR, bridge->ifname);
  48 }
  49
  50 int system_bridge_delbr(struct device *bridge)
  51 {
  52         return ioctl(sock_ioctl, SIOCBRDELBR, bridge->ifname);
  53 }
  54
  55 static int system_bridge_if(struct device *bridge, struct device *dev, int cmd)
  56 {
  57         struct ifreq ifr;
  58         ifr.ifr_ifindex = dev->ifindex;
  59         strncpy(ifr.ifr_name, bridge->ifname, sizeof(ifr.ifr_name));
  60         return ioctl(sock_ioctl, cmd, &ifr);
  61 }
  62
  63 int system_bridge_addif(struct device *bridge, struct device *dev)
  64 {
  65         return system_bridge_if(bridge, dev, SIOCBRADDIF);
  66 }
  67
  68 int system_bridge_delif(struct device *bridge, struct device *dev)
  69 {
  70         return system_bridge_if(bridge, dev, SIOCBRDELIF);
  71 }
  72
  73 static int system_vlan(struct device *dev, int id)
  74 {
  75         struct vlan_ioctl_args ifr = {
  76                 .cmd = (id == 0) ? DEL_VLAN_CMD : ADD_VLAN_CMD,
  77                 .u = {.VID = id},
  78         };
  79         strncpy(ifr.device1, dev->ifname, sizeof(ifr.device1));
  80         return ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
  81 }
  82
  83 int system_vlan_add(struct device *dev, int id)
  84 {
  85         return system_vlan(dev, id);
  86 }
  87
  88 int system_vlan_del(struct device *dev)
  89 {
  90         return system_vlan(dev, 0);
  91 }
  92
  93 static int system_if_flags(struct device *dev, unsigned add, unsigned rem)
  94 {
  95         struct ifreq ifr;
  96         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
  97         ioctl(sock_ioctl, SIOCGIFFLAGS, &ifr);
  98         ifr.ifr_flags |= add;
  99         ifr.ifr_flags &= ~rem;
 100         return ioctl(sock_ioctl, SIOCSIFFLAGS, &ifr);
 101 }
 102
 103 int system_if_up(struct device *dev)
 104 {
 105         return system_if_flags(dev, IFF_UP, 0);
 106 }
 107
 108 int system_if_down(struct device *dev)
 109 {
 110         return system_if_flags(dev, 0, IFF_UP);
 111 }
 112
 113 int system_if_check(struct device *dev)
 114 {
 115         struct ifreq ifr;
 116         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
 117         if (ioctl(sock_ioctl, SIOCGIFINDEX, &ifr))
 118                 return -1;
 119
 120         dev->ifindex = ifr.ifr_ifindex;
 121
 122         /* if (!strcmp(dev->ifname, "eth0"))
 123                 device_set_present(dev, true); */
 124         return 0;
 125 }
 126
 127 static int system_addr(struct device *dev, struct device_addr *addr, int cmd)
 128 {
 129         int alen = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16;
 130         struct ifaddrmsg ifa = {
 131                 .ifa_family = (alen == 4) ? AF_INET : AF_INET6,
 132                 .ifa_prefixlen = addr->mask,
 133                 .ifa_index = dev->ifindex,
 134         };
 135
 136         struct nl_msg *msg = nlmsg_alloc_simple(cmd, 0);
 137         if (!msg)
 138                 return -1;
 139
 140         nlmsg_append(msg, &ifa, sizeof(ifa), 0);
 141         nla_put(msg, IFA_ADDRESS, alen, &addr->addr);
 142         return system_rtnl_call(msg);
 143 }
 144
 145 int system_add_address(struct device *dev, struct device_addr *addr)
 146 {
 147         return system_addr(dev, addr, RTM_NEWADDR);
 148 }
 149
 150 int system_del_address(struct device *dev, struct device_addr *addr)
 151 {
 152         return system_addr(dev, addr, RTM_DELADDR);
 153 }
 154
 155 static int system_rt(struct device *dev, struct device_route *route, int cmd)
 156 {
 157         int alen = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16;
 158         bool have_gw;
 159
 160         if (alen == 4)
 161                 have_gw = !!route->nexthop.in.s_addr;
 162         else
 163                 have_gw = route->nexthop.in6.s6_addr32[0] ||
 164                         route->nexthop.in6.s6_addr32[1] ||
 165                         route->nexthop.in6.s6_addr32[2] ||
 166                         route->nexthop.in6.s6_addr32[3];
 167
 168         unsigned char scope = (cmd == RTM_DELROUTE) ? RT_SCOPE_NOWHERE :
 169                         (have_gw) ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK;
 170
 171         struct rtmsg rtm = {
 172                 .rtm_family = (alen == 4) ? AF_INET : AF_INET6,
 173                 .rtm_dst_len = route->mask,
 174                 .rtm_table = RT_TABLE_MAIN,
 175                 .rtm_protocol = RTPROT_BOOT,
 176                 .rtm_scope = scope,
 177                 .rtm_type = (cmd == RTM_DELROUTE) ? 0: RTN_UNICAST,
 178         };
 179
 180         struct nl_msg *msg = nlmsg_alloc_simple(cmd, 0);
 181         if (!msg)
 182                 return -1;
 183
 184         nlmsg_append(msg, &rtm, sizeof(rtm), 0);
 185
 186         if (route->mask)
 187                 nla_put(msg, RTA_DST, alen, &route->addr);
 188
 189         if (have_gw)
 190                 nla_put(msg, RTA_GATEWAY, alen, &route->nexthop);
 191
 192         if (route->flags & DEVADDR_DEVICE)
 193                 nla_put_u32(msg, RTA_OIF, dev->ifindex);
 194
 195         return system_rtnl_call(msg);
 196 }
 197
 198 int system_add_route(struct device *dev, struct device_route *route)
 199 {
 200         return system_rt(dev, route, RTM_NEWROUTE);
 201 }
 202
 203 int system_del_route(struct device *dev, struct device_route *route)
 204 {
 205         return system_rt(dev, route, RTM_DELROUTE);
 206 }