d6df583c87
Similar to the virtual ethernet driver veth, vxcan implements a local CAN traffic tunnel between two virtual CAN network devices. When creating a vxcan, two vxcan devices are created as pair When one end receives the packet it appears on its pair and vice versa. The vxcan can be used for cross namespace communication.
90 lines
2.5 KiB
C
90 lines
2.5 KiB
C
/***
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This file is part of systemd.
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Copyright 2017 Susant Sahani
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include "netdev/vxcan.h"
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#include "missing.h"
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static int netdev_vxcan_fill_message_create(NetDev *netdev, Link *link, sd_netlink_message *m) {
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VxCan *v;
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int r;
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assert(netdev);
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assert(!link);
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assert(m);
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v = VXCAN(netdev);
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assert(v);
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r = sd_netlink_message_open_container(m, VXCAN_INFO_PEER);
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if (r < 0)
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return log_netdev_error_errno(netdev, r, "Could not append VXCAN_INFO_PEER attribute: %m");
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if (v->ifname_peer) {
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r = sd_netlink_message_append_string(m, IFLA_IFNAME, v->ifname_peer);
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if (r < 0)
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return log_error_errno(r, "Failed to add vxcan netlink interface peer name: %m");
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}
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r = sd_netlink_message_close_container(m);
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if (r < 0)
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return log_netdev_error_errno(netdev, r, "Could not append VXCAN_INFO_PEER attribute: %m");
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return r;
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}
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static int netdev_vxcan_verify(NetDev *netdev, const char *filename) {
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VxCan *v;
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assert(netdev);
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assert(filename);
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v = VXCAN(netdev);
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assert(v);
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if (!v->ifname_peer) {
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log_warning("VxCan NetDev without peer name configured in %s. Ignoring", filename);
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return -EINVAL;
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}
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return 0;
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}
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static void vxcan_done(NetDev *n) {
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VxCan *v;
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assert(n);
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v = VXCAN(n);
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assert(v);
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free(v->ifname_peer);
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}
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const NetDevVTable vxcan_vtable = {
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.object_size = sizeof(VxCan),
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.sections = "Match\0NetDev\0VXCAN\0",
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.done = vxcan_done,
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.fill_message_create = netdev_vxcan_fill_message_create,
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.create_type = NETDEV_CREATE_INDEPENDENT,
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.config_verify = netdev_vxcan_verify,
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};
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