cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

vport-vxlan.c (3776B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Copyright (c) 2014 Nicira, Inc.
      4 * Copyright (c) 2013 Cisco Systems, Inc.
      5 */
      6
      7#include <linux/kernel.h>
      8#include <linux/skbuff.h>
      9#include <linux/openvswitch.h>
     10#include <linux/module.h>
     11#include <net/udp.h>
     12#include <net/ip_tunnels.h>
     13#include <net/rtnetlink.h>
     14#include <net/vxlan.h>
     15
     16#include "datapath.h"
     17#include "vport.h"
     18#include "vport-netdev.h"
     19
     20static struct vport_ops ovs_vxlan_netdev_vport_ops;
     21
     22static int vxlan_get_options(const struct vport *vport, struct sk_buff *skb)
     23{
     24	struct vxlan_dev *vxlan = netdev_priv(vport->dev);
     25	__be16 dst_port = vxlan->cfg.dst_port;
     26
     27	if (nla_put_u16(skb, OVS_TUNNEL_ATTR_DST_PORT, ntohs(dst_port)))
     28		return -EMSGSIZE;
     29
     30	if (vxlan->cfg.flags & VXLAN_F_GBP) {
     31		struct nlattr *exts;
     32
     33		exts = nla_nest_start_noflag(skb, OVS_TUNNEL_ATTR_EXTENSION);
     34		if (!exts)
     35			return -EMSGSIZE;
     36
     37		if (vxlan->cfg.flags & VXLAN_F_GBP &&
     38		    nla_put_flag(skb, OVS_VXLAN_EXT_GBP))
     39			return -EMSGSIZE;
     40
     41		nla_nest_end(skb, exts);
     42	}
     43
     44	return 0;
     45}
     46
     47static const struct nla_policy exts_policy[OVS_VXLAN_EXT_MAX + 1] = {
     48	[OVS_VXLAN_EXT_GBP]	= { .type = NLA_FLAG, },
     49};
     50
     51static int vxlan_configure_exts(struct vport *vport, struct nlattr *attr,
     52				struct vxlan_config *conf)
     53{
     54	struct nlattr *exts[OVS_VXLAN_EXT_MAX + 1];
     55	int err;
     56
     57	if (nla_len(attr) < sizeof(struct nlattr))
     58		return -EINVAL;
     59
     60	err = nla_parse_nested_deprecated(exts, OVS_VXLAN_EXT_MAX, attr,
     61					  exts_policy, NULL);
     62	if (err < 0)
     63		return err;
     64
     65	if (exts[OVS_VXLAN_EXT_GBP])
     66		conf->flags |= VXLAN_F_GBP;
     67
     68	return 0;
     69}
     70
     71static struct vport *vxlan_tnl_create(const struct vport_parms *parms)
     72{
     73	struct net *net = ovs_dp_get_net(parms->dp);
     74	struct nlattr *options = parms->options;
     75	struct net_device *dev;
     76	struct vport *vport;
     77	struct nlattr *a;
     78	int err;
     79	struct vxlan_config conf = {
     80		.no_share = true,
     81		.flags = VXLAN_F_COLLECT_METADATA | VXLAN_F_UDP_ZERO_CSUM6_RX,
     82		/* Don't restrict the packets that can be sent by MTU */
     83		.mtu = IP_MAX_MTU,
     84	};
     85
     86	if (!options) {
     87		err = -EINVAL;
     88		goto error;
     89	}
     90
     91	a = nla_find_nested(options, OVS_TUNNEL_ATTR_DST_PORT);
     92	if (a && nla_len(a) == sizeof(u16)) {
     93		conf.dst_port = htons(nla_get_u16(a));
     94	} else {
     95		/* Require destination port from userspace. */
     96		err = -EINVAL;
     97		goto error;
     98	}
     99
    100	vport = ovs_vport_alloc(0, &ovs_vxlan_netdev_vport_ops, parms);
    101	if (IS_ERR(vport))
    102		return vport;
    103
    104	a = nla_find_nested(options, OVS_TUNNEL_ATTR_EXTENSION);
    105	if (a) {
    106		err = vxlan_configure_exts(vport, a, &conf);
    107		if (err) {
    108			ovs_vport_free(vport);
    109			goto error;
    110		}
    111	}
    112
    113	rtnl_lock();
    114	dev = vxlan_dev_create(net, parms->name, NET_NAME_USER, &conf);
    115	if (IS_ERR(dev)) {
    116		rtnl_unlock();
    117		ovs_vport_free(vport);
    118		return ERR_CAST(dev);
    119	}
    120
    121	err = dev_change_flags(dev, dev->flags | IFF_UP, NULL);
    122	if (err < 0) {
    123		rtnl_delete_link(dev);
    124		rtnl_unlock();
    125		ovs_vport_free(vport);
    126		goto error;
    127	}
    128
    129	rtnl_unlock();
    130	return vport;
    131error:
    132	return ERR_PTR(err);
    133}
    134
    135static struct vport *vxlan_create(const struct vport_parms *parms)
    136{
    137	struct vport *vport;
    138
    139	vport = vxlan_tnl_create(parms);
    140	if (IS_ERR(vport))
    141		return vport;
    142
    143	return ovs_netdev_link(vport, parms->name);
    144}
    145
    146static struct vport_ops ovs_vxlan_netdev_vport_ops = {
    147	.type			= OVS_VPORT_TYPE_VXLAN,
    148	.create			= vxlan_create,
    149	.destroy		= ovs_netdev_tunnel_destroy,
    150	.get_options		= vxlan_get_options,
    151	.send			= dev_queue_xmit,
    152};
    153
    154static int __init ovs_vxlan_tnl_init(void)
    155{
    156	return ovs_vport_ops_register(&ovs_vxlan_netdev_vport_ops);
    157}
    158
    159static void __exit ovs_vxlan_tnl_exit(void)
    160{
    161	ovs_vport_ops_unregister(&ovs_vxlan_netdev_vport_ops);
    162}
    163
    164module_init(ovs_vxlan_tnl_init);
    165module_exit(ovs_vxlan_tnl_exit);
    166
    167MODULE_DESCRIPTION("OVS: VXLAN switching port");
    168MODULE_LICENSE("GPL");
    169MODULE_ALIAS("vport-type-4");