diff options
| -rw-r--r-- | system-linux.c | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/system-linux.c b/system-linux.c new file mode 100644 index 0000000..1dbb651 --- /dev/null +++ b/system-linux.c @@ -0,0 +1,202 @@ +#include <sys/socket.h> +#include <sys/ioctl.h> + +#include <linux/rtnetlink.h> +#include <linux/sockios.h> +#include <linux/if_vlan.h> + +#include <stddef.h> +#include <string.h> +#include <fcntl.h> +#include <errno.h> + +#include <netlink/msg.h> + +#include "netifd.h" +#include "device.h" +#include "system.h" + +static int sock_ioctl = -1; +static struct nl_sock *sock_rtnl = NULL; + +static void __init system_init(void) +{ + sock_ioctl = socket(AF_LOCAL, SOCK_DGRAM, 0); + fcntl(sock_ioctl, F_SETFD, fcntl(sock_ioctl, F_GETFD) | FD_CLOEXEC); + + if ((sock_rtnl = nl_socket_alloc())) { + if (nl_connect(sock_rtnl, NETLINK_ROUTE)) { + nl_socket_free(sock_rtnl); + sock_rtnl = NULL; + } + } +} + +static int system_rtnl_call(struct nl_msg *msg) +{ + return -!!(!sock_rtnl || nl_send_auto_complete(sock_rtnl, msg) + || nl_wait_for_ack(sock_rtnl)); +} + +int system_bridge_addbr(struct device *bridge) +{ + return ioctl(sock_ioctl, SIOCBRADDBR, bridge->ifname); +} + +int system_bridge_delbr(struct device *bridge) +{ + return ioctl(sock_ioctl, SIOCBRDELBR, bridge->ifname); +} + +static int system_bridge_if(struct device *bridge, struct device *dev, int cmd) +{ + struct ifreq ifr; + ifr.ifr_ifindex = dev->ifindex; + strncpy(ifr.ifr_name, bridge->ifname, sizeof(ifr.ifr_name)); + return ioctl(sock_ioctl, cmd, &ifr); +} + +int system_bridge_addif(struct device *bridge, struct device *dev) +{ + return system_bridge_if(bridge, dev, SIOCBRADDIF); +} + +int system_bridge_delif(struct device *bridge, struct device *dev) +{ + return system_bridge_if(bridge, dev, SIOCBRDELIF); +} + +static int system_vlan(struct device *dev, int id) +{ + struct vlan_ioctl_args ifr = { + .cmd = (id == 0) ? DEL_VLAN_CMD : ADD_VLAN_CMD, + .u = {.VID = id}, + }; + strncpy(ifr.device1, dev->ifname, sizeof(ifr.device1)); + return ioctl(sock_ioctl, SIOCSIFVLAN, &ifr); +} + +int system_vlan_add(struct device *dev, int id) +{ + return system_vlan(dev, id); +} + +int system_vlan_del(struct device *dev) +{ + return system_vlan(dev, 0); +} + +static int system_if_flags(struct device *dev, unsigned add, unsigned rem) +{ + struct ifreq ifr; + strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name)); + ioctl(sock_ioctl, SIOCGIFFLAGS, &ifr); + ifr.ifr_flags |= add; + ifr.ifr_flags &= ~rem; + return ioctl(sock_ioctl, SIOCSIFFLAGS, &ifr); +} + +int system_if_up(struct device *dev) +{ + return system_if_flags(dev, IFF_UP, 0); +} + +int system_if_down(struct device *dev) +{ + return system_if_flags(dev, 0, IFF_UP); +} + +int system_if_check(struct device *dev) +{ + struct ifreq ifr; + strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name)); + if (ioctl(sock_ioctl, SIOCGIFINDEX, &ifr)) + return -1; + + dev->ifindex = ifr.ifr_ifindex; + + /* if (!strcmp(dev->ifname, "eth0")) + device_set_present(dev, true); */ + return 0; +} + +static int system_addr(struct device *dev, struct device_addr *addr, int cmd) +{ + int alen = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16; + struct ifaddrmsg ifa = { + .ifa_family = (alen == 4) ? AF_INET : AF_INET6, + .ifa_prefixlen = addr->mask, + .ifa_index = dev->ifindex, + }; + + struct nl_msg *msg = nlmsg_alloc_simple(cmd, 0); + if (!msg) + return -1; + + nlmsg_append(msg, &ifa, sizeof(ifa), 0); + nla_put(msg, IFA_ADDRESS, alen, &addr->addr); + return system_rtnl_call(msg); +} + +int system_add_address(struct device *dev, struct device_addr *addr) +{ + return system_addr(dev, addr, RTM_NEWADDR); +} + +int system_del_address(struct device *dev, struct device_addr *addr) +{ + return system_addr(dev, addr, RTM_DELADDR); +} + +static int system_rt(struct device *dev, struct device_route *route, int cmd) +{ + int alen = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16; + bool have_gw; + + if (alen == 4) + have_gw = !!route->nexthop.in.s_addr; + else + have_gw = route->nexthop.in6.s6_addr32[0] || + route->nexthop.in6.s6_addr32[1] || + route->nexthop.in6.s6_addr32[2] || + route->nexthop.in6.s6_addr32[3]; + + unsigned char scope = (cmd == RTM_DELROUTE) ? RT_SCOPE_NOWHERE : + (have_gw) ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK; + + struct rtmsg rtm = { + .rtm_family = (alen == 4) ? AF_INET : AF_INET6, + .rtm_dst_len = route->mask, + .rtm_table = RT_TABLE_MAIN, + .rtm_protocol = RTPROT_BOOT, + .rtm_scope = scope, + .rtm_type = (cmd == RTM_DELROUTE) ? 0: RTN_UNICAST, + }; + + struct nl_msg *msg = nlmsg_alloc_simple(cmd, 0); + if (!msg) + return -1; + + nlmsg_append(msg, &rtm, sizeof(rtm), 0); + + if (route->mask) + nla_put(msg, RTA_DST, alen, &route->addr); + + if (have_gw) + nla_put(msg, RTA_GATEWAY, alen, &route->nexthop); + + if (route->flags & DEVADDR_DEVICE) + nla_put_u32(msg, RTA_OIF, dev->ifindex); + + return system_rtnl_call(msg); +} + +int system_add_route(struct device *dev, struct device_route *route) +{ + return system_rt(dev, route, RTM_NEWROUTE); +} + +int system_del_route(struct device *dev, struct device_route *route) +{ + return system_rt(dev, route, RTM_DELROUTE); +} |