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linux/drivers/net/vxlan.c
Hangbin Liu a0dced17ad Revert "vxlan: fix tos value before xmit" 
This reverts commit 71130f2997.

In commit 71130f2997 ("vxlan: fix tos value before xmit") we want to
make sure the tos value are filtered by RT_TOS() based on RFC1349.

       0     1     2     3     4     5     6     7
    +-----+-----+-----+-----+-----+-----+-----+-----+
    |   PRECEDENCE    |          TOS          | MBZ |
    +-----+-----+-----+-----+-----+-----+-----+-----+

But RFC1349 has been obsoleted by RFC2474. The new DSCP field defined like

       0     1     2     3     4     5     6     7
    +-----+-----+-----+-----+-----+-----+-----+-----+
    |          DS FIELD, DSCP           | ECN FIELD |
    +-----+-----+-----+-----+-----+-----+-----+-----+

So with

IPTOS_TOS_MASK          0x1E
RT_TOS(tos)		((tos)&IPTOS_TOS_MASK)

the first 3 bits DSCP info will get lost.

To take all the DSCP info in xmit, we should revert the patch and just push
all tos bits to ip_tunnel_ecn_encap(), which will handling ECN field later.

Fixes: 71130f2997 ("vxlan: fix tos value before xmit")
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Acked-by: Guillaume Nault <gnault@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2020-08-05 12:09:10 -07:00

4812 lines
121 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
/*
* VXLAN: Virtual eXtensible Local Area Network
*
* Copyright (c) 2012-2013 Vyatta Inc.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/udp.h>
#include <linux/igmp.h>
#include <linux/if_ether.h>
#include <linux/ethtool.h>
#include <net/arp.h>
#include <net/ndisc.h>
#include <net/ipv6_stubs.h>
#include <net/ip.h>
#include <net/icmp.h>
#include <net/rtnetlink.h>
#include <net/inet_ecn.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
#include <net/tun_proto.h>
#include <net/vxlan.h>
#include <net/nexthop.h>
#if IS_ENABLED(CONFIG_IPV6)
#include <net/ip6_tunnel.h>
#include <net/ip6_checksum.h>
#endif
#define VXLAN_VERSION "0.1"
#define PORT_HASH_BITS 8
#define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
#define FDB_AGE_DEFAULT 300 /* 5 min */
#define FDB_AGE_INTERVAL (10 * HZ) /* rescan interval */
/* UDP port for VXLAN traffic.
* The IANA assigned port is 4789, but the Linux default is 8472
* for compatibility with early adopters.
*/
static unsigned short vxlan_port __read_mostly = 8472;
module_param_named(udp_port, vxlan_port, ushort, 0444);
MODULE_PARM_DESC(udp_port, "Destination UDP port");
static bool log_ecn_error = true;
module_param(log_ecn_error, bool, 0644);
MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
static unsigned int vxlan_net_id;
static struct rtnl_link_ops vxlan_link_ops;
static const u8 all_zeros_mac[ETH_ALEN + 2];
static int vxlan_sock_add(struct vxlan_dev *vxlan);
static void vxlan_vs_del_dev(struct vxlan_dev *vxlan);
/* per-network namespace private data for this module */
struct vxlan_net {
struct list_head vxlan_list;
struct hlist_head sock_list[PORT_HASH_SIZE];
spinlock_t sock_lock;
};
/* Forwarding table entry */
struct vxlan_fdb {
struct hlist_node hlist; /* linked list of entries */
struct rcu_head rcu;
unsigned long updated; /* jiffies */
unsigned long used;
struct list_head remotes;
u8 eth_addr[ETH_ALEN];
u16 state; /* see ndm_state */
__be32 vni;
u16 flags; /* see ndm_flags and below */
struct list_head nh_list;
struct nexthop __rcu *nh;
struct vxlan_dev __rcu *vdev;
};
#define NTF_VXLAN_ADDED_BY_USER 0x100
/* salt for hash table */
static u32 vxlan_salt __read_mostly;
static inline bool vxlan_collect_metadata(struct vxlan_sock *vs)
{
return vs->flags & VXLAN_F_COLLECT_METADATA ||
ip_tunnel_collect_metadata();
}
#if IS_ENABLED(CONFIG_IPV6)
static inline
bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
{
if (a->sa.sa_family != b->sa.sa_family)
return false;
if (a->sa.sa_family == AF_INET6)
return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
else
return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
}
static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
{
if (nla_len(nla) >= sizeof(struct in6_addr)) {
ip->sin6.sin6_addr = nla_get_in6_addr(nla);
ip->sa.sa_family = AF_INET6;
return 0;
} else if (nla_len(nla) >= sizeof(__be32)) {
ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
ip->sa.sa_family = AF_INET;
return 0;
} else {
return -EAFNOSUPPORT;
}
}
static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
const union vxlan_addr *ip)
{
if (ip->sa.sa_family == AF_INET6)
return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
else
return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
}
#else /* !CONFIG_IPV6 */
static inline
bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
{
return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
}
static int vxlan_nla_get_addr(union vxlan_addr *ip, struct nlattr *nla)
{
if (nla_len(nla) >= sizeof(struct in6_addr)) {
return -EAFNOSUPPORT;
} else if (nla_len(nla) >= sizeof(__be32)) {
ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
ip->sa.sa_family = AF_INET;
return 0;
} else {
return -EAFNOSUPPORT;
}
}
static int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
const union vxlan_addr *ip)
{
return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
}
#endif
/* Virtual Network hash table head */
static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni)
{
return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)];
}
/* Socket hash table head */
static inline struct hlist_head *vs_head(struct net *net, __be16 port)
{
struct vxlan_net *vn = net_generic(net, vxlan_net_id);
return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
}
/* First remote destination for a forwarding entry.
* Guaranteed to be non-NULL because remotes are never deleted.
*/
static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
{
if (rcu_access_pointer(fdb->nh))
return NULL;
return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
}
static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
{
if (rcu_access_pointer(fdb->nh))
return NULL;
return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
}
/* Find VXLAN socket based on network namespace, address family and UDP port
* and enabled unshareable flags.
*/
static struct vxlan_sock *vxlan_find_sock(struct net *net, sa_family_t family,
__be16 port, u32 flags, int ifindex)
{
struct vxlan_sock *vs;
flags &= VXLAN_F_RCV_FLAGS;
hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
if (inet_sk(vs->sock->sk)->inet_sport == port &&
vxlan_get_sk_family(vs) == family &&
vs->flags == flags &&
vs->sock->sk->sk_bound_dev_if == ifindex)
return vs;
}
return NULL;
}
static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, int ifindex,
__be32 vni)
{
struct vxlan_dev_node *node;
/* For flow based devices, map all packets to VNI 0 */
if (vs->flags & VXLAN_F_COLLECT_METADATA)
vni = 0;
hlist_for_each_entry_rcu(node, vni_head(vs, vni), hlist) {
if (node->vxlan->default_dst.remote_vni != vni)
continue;
if (IS_ENABLED(CONFIG_IPV6)) {
const struct vxlan_config *cfg = &node->vxlan->cfg;
if ((cfg->flags & VXLAN_F_IPV6_LINKLOCAL) &&
cfg->remote_ifindex != ifindex)
continue;
}
return node->vxlan;
}
return NULL;
}
/* Look up VNI in a per net namespace table */
static struct vxlan_dev *vxlan_find_vni(struct net *net, int ifindex,
__be32 vni, sa_family_t family,
__be16 port, u32 flags)
{
struct vxlan_sock *vs;
vs = vxlan_find_sock(net, family, port, flags, ifindex);
if (!vs)
return NULL;
return vxlan_vs_find_vni(vs, ifindex, vni);
}
/* Fill in neighbour message in skbuff. */
static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
const struct vxlan_fdb *fdb,
u32 portid, u32 seq, int type, unsigned int flags,
const struct vxlan_rdst *rdst)
{
unsigned long now = jiffies;
struct nda_cacheinfo ci;
bool send_ip, send_eth;
struct nlmsghdr *nlh;
struct nexthop *nh;
struct ndmsg *ndm;
int nh_family;
u32 nh_id;
nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
if (nlh == NULL)
return -EMSGSIZE;
ndm = nlmsg_data(nlh);
memset(ndm, 0, sizeof(*ndm));
send_eth = send_ip = true;
rcu_read_lock();
nh = rcu_dereference(fdb->nh);
if (nh) {
nh_family = nexthop_get_family(nh);
nh_id = nh->id;
}
rcu_read_unlock();
if (type == RTM_GETNEIGH) {
if (rdst) {
send_ip = !vxlan_addr_any(&rdst->remote_ip);
ndm->ndm_family = send_ip ? rdst->remote_ip.sa.sa_family : AF_INET;
} else if (nh) {
ndm->ndm_family = nh_family;
}
send_eth = !is_zero_ether_addr(fdb->eth_addr);
} else
ndm->ndm_family = AF_BRIDGE;
ndm->ndm_state = fdb->state;
ndm->ndm_ifindex = vxlan->dev->ifindex;
ndm->ndm_flags = fdb->flags;
if (rdst && rdst->offloaded)
ndm->ndm_flags |= NTF_OFFLOADED;
ndm->ndm_type = RTN_UNICAST;
if (!net_eq(dev_net(vxlan->dev), vxlan->net) &&
nla_put_s32(skb, NDA_LINK_NETNSID,
peernet2id(dev_net(vxlan->dev), vxlan->net)))
goto nla_put_failure;
if (send_eth && nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->eth_addr))
goto nla_put_failure;
if (nh) {
if (nla_put_u32(skb, NDA_NH_ID, nh_id))
goto nla_put_failure;
} else if (rdst) {
if (send_ip && vxlan_nla_put_addr(skb, NDA_DST,
&rdst->remote_ip))
goto nla_put_failure;
if (rdst->remote_port &&
rdst->remote_port != vxlan->cfg.dst_port &&
nla_put_be16(skb, NDA_PORT, rdst->remote_port))
goto nla_put_failure;
if (rdst->remote_vni != vxlan->default_dst.remote_vni &&
nla_put_u32(skb, NDA_VNI, be32_to_cpu(rdst->remote_vni)))
goto nla_put_failure;
if (rdst->remote_ifindex &&
nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
goto nla_put_failure;
}
if ((vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) && fdb->vni &&
nla_put_u32(skb, NDA_SRC_VNI,
be32_to_cpu(fdb->vni)))
goto nla_put_failure;
ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
ci.ndm_confirmed = 0;
ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
ci.ndm_refcnt = 0;
if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
goto nla_put_failure;
nlmsg_end(skb, nlh);
return 0;
nla_put_failure:
nlmsg_cancel(skb, nlh);
return -EMSGSIZE;
}
static inline size_t vxlan_nlmsg_size(void)
{
return NLMSG_ALIGN(sizeof(struct ndmsg))
+ nla_total_size(ETH_ALEN) /* NDA_LLADDR */
+ nla_total_size(sizeof(struct in6_addr)) /* NDA_DST */
+ nla_total_size(sizeof(__be16)) /* NDA_PORT */
+ nla_total_size(sizeof(__be32)) /* NDA_VNI */
+ nla_total_size(sizeof(__u32)) /* NDA_IFINDEX */
+ nla_total_size(sizeof(__s32)) /* NDA_LINK_NETNSID */
+ nla_total_size(sizeof(struct nda_cacheinfo));
}
static void __vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
struct vxlan_rdst *rd, int type)
{
struct net *net = dev_net(vxlan->dev);
struct sk_buff *skb;
int err = -ENOBUFS;
skb = nlmsg_new(vxlan_nlmsg_size(), GFP_ATOMIC);
if (skb == NULL)
goto errout;
err = vxlan_fdb_info(skb, vxlan, fdb, 0, 0, type, 0, rd);
if (err < 0) {
/* -EMSGSIZE implies BUG in vxlan_nlmsg_size() */
WARN_ON(err == -EMSGSIZE);
kfree_skb(skb);
goto errout;
}
rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
return;
errout:
if (err < 0)
rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
}
static void vxlan_fdb_switchdev_notifier_info(const struct vxlan_dev *vxlan,
const struct vxlan_fdb *fdb,
const struct vxlan_rdst *rd,
struct netlink_ext_ack *extack,
struct switchdev_notifier_vxlan_fdb_info *fdb_info)
{
fdb_info->info.dev = vxlan->dev;
fdb_info->info.extack = extack;
fdb_info->remote_ip = rd->remote_ip;
fdb_info->remote_port = rd->remote_port;
fdb_info->remote_vni = rd->remote_vni;
fdb_info->remote_ifindex = rd->remote_ifindex;
memcpy(fdb_info->eth_addr, fdb->eth_addr, ETH_ALEN);
fdb_info->vni = fdb->vni;
fdb_info->offloaded = rd->offloaded;
fdb_info->added_by_user = fdb->flags & NTF_VXLAN_ADDED_BY_USER;
}
static int vxlan_fdb_switchdev_call_notifiers(struct vxlan_dev *vxlan,
struct vxlan_fdb *fdb,
struct vxlan_rdst *rd,
bool adding,
struct netlink_ext_ack *extack)
{
struct switchdev_notifier_vxlan_fdb_info info;
enum switchdev_notifier_type notifier_type;
int ret;
if (WARN_ON(!rd))
return 0;
notifier_type = adding ? SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE
: SWITCHDEV_VXLAN_FDB_DEL_TO_DEVICE;
vxlan_fdb_switchdev_notifier_info(vxlan, fdb, rd, NULL, &info);
ret = call_switchdev_notifiers(notifier_type, vxlan->dev,
&info.info, extack);
return notifier_to_errno(ret);
}
static int vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
struct vxlan_rdst *rd, int type, bool swdev_notify,
struct netlink_ext_ack *extack)
{
int err;
if (swdev_notify && rd) {
switch (type) {
case RTM_NEWNEIGH:
err = vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd,
true, extack);
if (err)
return err;
break;
case RTM_DELNEIGH:
vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd,
false, extack);
break;
}
}
__vxlan_fdb_notify(vxlan, fdb, rd, type);
return 0;
}
static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
struct vxlan_fdb f = {
.state = NUD_STALE,
};
struct vxlan_rdst remote = {
.remote_ip = *ipa, /* goes to NDA_DST */
.remote_vni = cpu_to_be32(VXLAN_N_VID),
};
vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL);
}
static void vxlan_fdb_miss(struct vxlan_dev *vxlan, const u8 eth_addr[ETH_ALEN])
{
struct vxlan_fdb f = {
.state = NUD_STALE,
};
struct vxlan_rdst remote = { };
memcpy(f.eth_addr, eth_addr, ETH_ALEN);
vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH, true, NULL);
}
/* Hash Ethernet address */
static u32 eth_hash(const unsigned char *addr)
{
u64 value = get_unaligned((u64 *)addr);
/* only want 6 bytes */
#ifdef __BIG_ENDIAN
value >>= 16;
#else
value <<= 16;
#endif
return hash_64(value, FDB_HASH_BITS);
}
static u32 eth_vni_hash(const unsigned char *addr, __be32 vni)
{
/* use 1 byte of OUI and 3 bytes of NIC */
u32 key = get_unaligned((u32 *)(addr + 2));
return jhash_2words(key, vni, vxlan_salt) & (FDB_HASH_SIZE - 1);
}
static u32 fdb_head_index(struct vxlan_dev *vxlan, const u8 *mac, __be32 vni)
{
if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)
return eth_vni_hash(mac, vni);
else
return eth_hash(mac);
}
/* Hash chain to use given mac address */
static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
const u8 *mac, __be32 vni)
{
return &vxlan->fdb_head[fdb_head_index(vxlan, mac, vni)];
}
/* Look up Ethernet address in forwarding table */
static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
const u8 *mac, __be32 vni)
{
struct hlist_head *head = vxlan_fdb_head(vxlan, mac, vni);
struct vxlan_fdb *f;
hlist_for_each_entry_rcu(f, head, hlist) {
if (ether_addr_equal(mac, f->eth_addr)) {
if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
if (vni == f->vni)
return f;
} else {
return f;
}
}
}
return NULL;
}
static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
const u8 *mac, __be32 vni)
{
struct vxlan_fdb *f;
f = __vxlan_find_mac(vxlan, mac, vni);
if (f && f->used != jiffies)
f->used = jiffies;
return f;
}
/* caller should hold vxlan->hash_lock */
static struct vxlan_rdst *vxlan_fdb_find_rdst(struct vxlan_fdb *f,
union vxlan_addr *ip, __be16 port,
__be32 vni, __u32 ifindex)
{
struct vxlan_rdst *rd;
list_for_each_entry(rd, &f->remotes, list) {
if (vxlan_addr_equal(&rd->remote_ip, ip) &&
rd->remote_port == port &&
rd->remote_vni == vni &&
rd->remote_ifindex == ifindex)
return rd;
}
return NULL;
}
int vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni,
struct switchdev_notifier_vxlan_fdb_info *fdb_info)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
u8 eth_addr[ETH_ALEN + 2] = { 0 };
struct vxlan_rdst *rdst;
struct vxlan_fdb *f;
int rc = 0;
if (is_multicast_ether_addr(mac) ||
is_zero_ether_addr(mac))
return -EINVAL;
ether_addr_copy(eth_addr, mac);
rcu_read_lock();
f = __vxlan_find_mac(vxlan, eth_addr, vni);
if (!f) {
rc = -ENOENT;
goto out;
}
rdst = first_remote_rcu(f);
vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, NULL, fdb_info);
out:
rcu_read_unlock();
return rc;
}
EXPORT_SYMBOL_GPL(vxlan_fdb_find_uc);
static int vxlan_fdb_notify_one(struct notifier_block *nb,
const struct vxlan_dev *vxlan,
const struct vxlan_fdb *f,
const struct vxlan_rdst *rdst,
struct netlink_ext_ack *extack)
{
struct switchdev_notifier_vxlan_fdb_info fdb_info;
int rc;
vxlan_fdb_switchdev_notifier_info(vxlan, f, rdst, extack, &fdb_info);
rc = nb->notifier_call(nb, SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE,
&fdb_info);
return notifier_to_errno(rc);
}
int vxlan_fdb_replay(const struct net_device *dev, __be32 vni,
struct notifier_block *nb,
struct netlink_ext_ack *extack)
{
struct vxlan_dev *vxlan;
struct vxlan_rdst *rdst;
struct vxlan_fdb *f;
unsigned int h;
int rc = 0;
if (!netif_is_vxlan(dev))
return -EINVAL;
vxlan = netdev_priv(dev);
for (h = 0; h < FDB_HASH_SIZE; ++h) {
spin_lock_bh(&vxlan->hash_lock[h]);
hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist) {
if (f->vni == vni) {
list_for_each_entry(rdst, &f->remotes, list) {
rc = vxlan_fdb_notify_one(nb, vxlan,
f, rdst,
extack);
if (rc)
goto unlock;
}
}
}
spin_unlock_bh(&vxlan->hash_lock[h]);
}
return 0;
unlock:
spin_unlock_bh(&vxlan->hash_lock[h]);
return rc;
}
EXPORT_SYMBOL_GPL(vxlan_fdb_replay);
void vxlan_fdb_clear_offload(const struct net_device *dev, __be32 vni)
{
struct vxlan_dev *vxlan;
struct vxlan_rdst *rdst;
struct vxlan_fdb *f;
unsigned int h;
if (!netif_is_vxlan(dev))
return;
vxlan = netdev_priv(dev);
for (h = 0; h < FDB_HASH_SIZE; ++h) {
spin_lock_bh(&vxlan->hash_lock[h]);
hlist_for_each_entry(f, &vxlan->fdb_head[h], hlist)
if (f->vni == vni)
list_for_each_entry(rdst, &f->remotes, list)
rdst->offloaded = false;
spin_unlock_bh(&vxlan->hash_lock[h]);
}
}
EXPORT_SYMBOL_GPL(vxlan_fdb_clear_offload);
/* Replace destination of unicast mac */
static int vxlan_fdb_replace(struct vxlan_fdb *f,
union vxlan_addr *ip, __be16 port, __be32 vni,
__u32 ifindex, struct vxlan_rdst *oldrd)
{
struct vxlan_rdst *rd;
rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
if (rd)
return 0;
rd = list_first_entry_or_null(&f->remotes, struct vxlan_rdst, list);
if (!rd)
return 0;
*oldrd = *rd;
dst_cache_reset(&rd->dst_cache);
rd->remote_ip = *ip;
rd->remote_port = port;
rd->remote_vni = vni;
rd->remote_ifindex = ifindex;
rd->offloaded = false;
return 1;
}
/* Add/update destinations for multicast */
static int vxlan_fdb_append(struct vxlan_fdb *f,
union vxlan_addr *ip, __be16 port, __be32 vni,
__u32 ifindex, struct vxlan_rdst **rdp)
{
struct vxlan_rdst *rd;
rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
if (rd)
return 0;
rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
if (rd == NULL)
return -ENOBUFS;
if (dst_cache_init(&rd->dst_cache, GFP_ATOMIC)) {
kfree(rd);
return -ENOBUFS;
}
rd->remote_ip = *ip;
rd->remote_port = port;
rd->offloaded = false;
rd->remote_vni = vni;
rd->remote_ifindex = ifindex;
list_add_tail_rcu(&rd->list, &f->remotes);
*rdp = rd;
return 1;
}
static struct vxlanhdr *vxlan_gro_remcsum(struct sk_buff *skb,
unsigned int off,
struct vxlanhdr *vh, size_t hdrlen,
__be32 vni_field,
struct gro_remcsum *grc,
bool nopartial)
{
size_t start, offset;
if (skb->remcsum_offload)
return vh;
if (!NAPI_GRO_CB(skb)->csum_valid)
return NULL;
start = vxlan_rco_start(vni_field);
offset = start + vxlan_rco_offset(vni_field);
vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
start, offset, grc, nopartial);
skb->remcsum_offload = 1;
return vh;
}
static struct sk_buff *vxlan_gro_receive(struct sock *sk,
struct list_head *head,
struct sk_buff *skb)
{
struct sk_buff *pp = NULL;
struct sk_buff *p;
struct vxlanhdr *vh, *vh2;
unsigned int hlen, off_vx;
int flush = 1;
struct vxlan_sock *vs = rcu_dereference_sk_user_data(sk);
__be32 flags;
struct gro_remcsum grc;
skb_gro_remcsum_init(&grc);
off_vx = skb_gro_offset(skb);
hlen = off_vx + sizeof(*vh);
vh = skb_gro_header_fast(skb, off_vx);
if (skb_gro_header_hard(skb, hlen)) {
vh = skb_gro_header_slow(skb, hlen, off_vx);
if (unlikely(!vh))
goto out;
}
skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
flags = vh->vx_flags;
if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
vh->vx_vni, &grc,
!!(vs->flags &
VXLAN_F_REMCSUM_NOPARTIAL));
if (!vh)
goto out;
}
skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
list_for_each_entry(p, head, list) {
if (!NAPI_GRO_CB(p)->same_flow)
continue;
vh2 = (struct vxlanhdr *)(p->data + off_vx);
if (vh->vx_flags != vh2->vx_flags ||
vh->vx_vni != vh2->vx_vni) {
NAPI_GRO_CB(p)->same_flow = 0;
continue;
}
}
pp = call_gro_receive(eth_gro_receive, head, skb);
flush = 0;
out:
skb_gro_flush_final_remcsum(skb, pp, flush, &grc);
return pp;
}
static int vxlan_gro_complete(struct sock *sk, struct sk_buff *skb, int nhoff)
{
/* Sets 'skb->inner_mac_header' since we are always called with
* 'skb->encapsulation' set.
*/
return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
}
static struct vxlan_fdb *vxlan_fdb_alloc(struct vxlan_dev *vxlan, const u8 *mac,
__u16 state, __be32 src_vni,
__u16 ndm_flags)
{
struct vxlan_fdb *f;
f = kmalloc(sizeof(*f), GFP_ATOMIC);
if (!f)
return NULL;
f->state = state;
f->flags = ndm_flags;
f->updated = f->used = jiffies;
f->vni = src_vni;
f->nh = NULL;
RCU_INIT_POINTER(f->vdev, vxlan);
INIT_LIST_HEAD(&f->nh_list);
INIT_LIST_HEAD(&f->remotes);
memcpy(f->eth_addr, mac, ETH_ALEN);
return f;
}
static void vxlan_fdb_insert(struct vxlan_dev *vxlan, const u8 *mac,
__be32 src_vni, struct vxlan_fdb *f)
{
++vxlan->addrcnt;
hlist_add_head_rcu(&f->hlist,
vxlan_fdb_head(vxlan, mac, src_vni));
}
static int vxlan_fdb_nh_update(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
u32 nhid, struct netlink_ext_ack *extack)
{
struct nexthop *old_nh = rtnl_dereference(fdb->nh);
struct nexthop *nh;
int err = -EINVAL;
if (old_nh && old_nh->id == nhid)
return 0;
nh = nexthop_find_by_id(vxlan->net, nhid);
if (!nh) {
NL_SET_ERR_MSG(extack, "Nexthop id does not exist");
goto err_inval;
}
if (nh) {
if (!nexthop_get(nh)) {
NL_SET_ERR_MSG(extack, "Nexthop has been deleted");
nh = NULL;
goto err_inval;
}
if (!nexthop_is_fdb(nh)) {
NL_SET_ERR_MSG(extack, "Nexthop is not a fdb nexthop");
goto err_inval;
}
if (!nexthop_is_multipath(nh)) {
NL_SET_ERR_MSG(extack, "Nexthop is not a multipath group");
goto err_inval;
}
/* check nexthop group family */
switch (vxlan->default_dst.remote_ip.sa.sa_family) {
case AF_INET:
if (!nexthop_has_v4(nh)) {
err = -EAFNOSUPPORT;
NL_SET_ERR_MSG(extack, "Nexthop group family not supported");
goto err_inval;
}
break;
case AF_INET6:
if (nexthop_has_v4(nh)) {
err = -EAFNOSUPPORT;
NL_SET_ERR_MSG(extack, "Nexthop group family not supported");
goto err_inval;
}
}
}
if (old_nh) {
list_del_rcu(&fdb->nh_list);
nexthop_put(old_nh);
}
rcu_assign_pointer(fdb->nh, nh);
list_add_tail_rcu(&fdb->nh_list, &nh->fdb_list);
return 1;
err_inval:
if (nh)
nexthop_put(nh);
return err;
}
static int vxlan_fdb_create(struct vxlan_dev *vxlan,
const u8 *mac, union vxlan_addr *ip,
__u16 state, __be16 port, __be32 src_vni,
__be32 vni, __u32 ifindex, __u16 ndm_flags,
u32 nhid, struct vxlan_fdb **fdb,
struct netlink_ext_ack *extack)
{
struct vxlan_rdst *rd = NULL;
struct vxlan_fdb *f;
int rc;
if (vxlan->cfg.addrmax &&
vxlan->addrcnt >= vxlan->cfg.addrmax)
return -ENOSPC;
netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
f = vxlan_fdb_alloc(vxlan, mac, state, src_vni, ndm_flags);
if (!f)
return -ENOMEM;
if (nhid)
rc = vxlan_fdb_nh_update(vxlan, f, nhid, extack);
else
rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
if (rc < 0)
goto errout;
*fdb = f;
return 0;
errout:
kfree(f);
return rc;
}
static void __vxlan_fdb_free(struct vxlan_fdb *f)
{
struct vxlan_rdst *rd, *nd;
struct nexthop *nh;
nh = rcu_dereference_raw(f->nh);
if (nh) {
rcu_assign_pointer(f->nh, NULL);
rcu_assign_pointer(f->vdev, NULL);
nexthop_put(nh);
}
list_for_each_entry_safe(rd, nd, &f->remotes, list) {
dst_cache_destroy(&rd->dst_cache);
kfree(rd);
}
kfree(f);
}
static void vxlan_fdb_free(struct rcu_head *head)
{
struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
__vxlan_fdb_free(f);
}
static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
bool do_notify, bool swdev_notify)
{
struct vxlan_rdst *rd;
netdev_dbg(vxlan->dev, "delete %pM\n", f->eth_addr);
--vxlan->addrcnt;
if (do_notify) {
if (rcu_access_pointer(f->nh))
vxlan_fdb_notify(vxlan, f, NULL, RTM_DELNEIGH,
swdev_notify, NULL);
else
list_for_each_entry(rd, &f->remotes, list)
vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH,
swdev_notify, NULL);
}
hlist_del_rcu(&f->hlist);
list_del_rcu(&f->nh_list);
call_rcu(&f->rcu, vxlan_fdb_free);
}
static void vxlan_dst_free(struct rcu_head *head)
{
struct vxlan_rdst *rd = container_of(head, struct vxlan_rdst, rcu);
dst_cache_destroy(&rd->dst_cache);
kfree(rd);
}
static int vxlan_fdb_update_existing(struct vxlan_dev *vxlan,
union vxlan_addr *ip,
__u16 state, __u16 flags,
__be16 port, __be32 vni,
__u32 ifindex, __u16 ndm_flags,
struct vxlan_fdb *f, u32 nhid,
bool swdev_notify,
struct netlink_ext_ack *extack)
{
__u16 fdb_flags = (ndm_flags & ~NTF_USE);
struct vxlan_rdst *rd = NULL;
struct vxlan_rdst oldrd;
int notify = 0;
int rc = 0;
int err;
if (nhid && !rcu_access_pointer(f->nh)) {
NL_SET_ERR_MSG(extack,
"Cannot replace an existing non nexthop fdb with a nexthop");
return -EOPNOTSUPP;
}
if (nhid && (flags & NLM_F_APPEND)) {
NL_SET_ERR_MSG(extack,
"Cannot append to a nexthop fdb");
return -EOPNOTSUPP;
}
/* Do not allow an externally learned entry to take over an entry added
* by the user.
*/
if (!(fdb_flags & NTF_EXT_LEARNED) ||
!(f->flags & NTF_VXLAN_ADDED_BY_USER)) {
if (f->state != state) {
f->state = state;
f->updated = jiffies;
notify = 1;
}
if (f->flags != fdb_flags) {
f->flags = fdb_flags;
f->updated = jiffies;
notify = 1;
}
}
if ((flags & NLM_F_REPLACE)) {
/* Only change unicasts */
if (!(is_multicast_ether_addr(f->eth_addr) ||
is_zero_ether_addr(f->eth_addr))) {
if (nhid) {
rc = vxlan_fdb_nh_update(vxlan, f, nhid, extack);
if (rc < 0)
return rc;
} else {
rc = vxlan_fdb_replace(f, ip, port, vni,
ifindex, &oldrd);
}
notify |= rc;
} else {
NL_SET_ERR_MSG(extack, "Cannot replace non-unicast fdb entries");
return -EOPNOTSUPP;
}
}
if ((flags & NLM_F_APPEND) &&
(is_multicast_ether_addr(f->eth_addr) ||
is_zero_ether_addr(f->eth_addr))) {
rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
if (rc < 0)
return rc;
notify |= rc;
}
if (ndm_flags & NTF_USE)
f->used = jiffies;
if (notify) {
if (rd == NULL)
rd = first_remote_rtnl(f);
err = vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH,
swdev_notify, extack);
if (err)
goto err_notify;
}
return 0;
err_notify:
if (nhid)
return err;
if ((flags & NLM_F_REPLACE) && rc)
*rd = oldrd;
else if ((flags & NLM_F_APPEND) && rc) {
list_del_rcu(&rd->list);
call_rcu(&rd->rcu, vxlan_dst_free);
}
return err;
}
static int vxlan_fdb_update_create(struct vxlan_dev *vxlan,
const u8 *mac, union vxlan_addr *ip,
__u16 state, __u16 flags,
__be16 port, __be32 src_vni, __be32 vni,
__u32 ifindex, __u16 ndm_flags, u32 nhid,
bool swdev_notify,
struct netlink_ext_ack *extack)
{
__u16 fdb_flags = (ndm_flags & ~NTF_USE);
struct vxlan_fdb *f;
int rc;
/* Disallow replace to add a multicast entry */
if ((flags & NLM_F_REPLACE) &&
(is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
return -EOPNOTSUPP;
netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
rc = vxlan_fdb_create(vxlan, mac, ip, state, port, src_vni,
vni, ifindex, fdb_flags, nhid, &f, extack);
if (rc < 0)
return rc;
vxlan_fdb_insert(vxlan, mac, src_vni, f);
rc = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH,
swdev_notify, extack);
if (rc)
goto err_notify;
return 0;
err_notify:
vxlan_fdb_destroy(vxlan, f, false, false);
return rc;
}
/* Add new entry to forwarding table -- assumes lock held */
static int vxlan_fdb_update(struct vxlan_dev *vxlan,
const u8 *mac, union vxlan_addr *ip,
__u16 state, __u16 flags,
__be16 port, __be32 src_vni, __be32 vni,
__u32 ifindex, __u16 ndm_flags, u32 nhid,
bool swdev_notify,
struct netlink_ext_ack *extack)
{
struct vxlan_fdb *f;
f = __vxlan_find_mac(vxlan, mac, src_vni);
if (f) {
if (flags & NLM_F_EXCL) {
netdev_dbg(vxlan->dev,
"lost race to create %pM\n", mac);
return -EEXIST;
}
return vxlan_fdb_update_existing(vxlan, ip, state, flags, port,
vni, ifindex, ndm_flags, f,
nhid, swdev_notify, extack);
} else {
if (!(flags & NLM_F_CREATE))
return -ENOENT;
return vxlan_fdb_update_create(vxlan, mac, ip, state, flags,
port, src_vni, vni, ifindex,
ndm_flags, nhid, swdev_notify,
extack);
}
}
static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
struct vxlan_rdst *rd, bool swdev_notify)
{
list_del_rcu(&rd->list);
vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH, swdev_notify, NULL);
call_rcu(&rd->rcu, vxlan_dst_free);
}
static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
union vxlan_addr *ip, __be16 *port, __be32 *src_vni,
__be32 *vni, u32 *ifindex, u32 *nhid)
{
struct net *net = dev_net(vxlan->dev);
int err;
if (tb[NDA_NH_ID] && (tb[NDA_DST] || tb[NDA_VNI] || tb[NDA_IFINDEX] ||
tb[NDA_PORT]))
return -EINVAL;
if (tb[NDA_DST]) {
err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
if (err)
return err;
} else {
union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
if (remote->sa.sa_family == AF_INET) {
ip->sin.sin_addr.s_addr = htonl(INADDR_ANY);
ip->sa.sa_family = AF_INET;
#if IS_ENABLED(CONFIG_IPV6)
} else {
ip->sin6.sin6_addr = in6addr_any;
ip->sa.sa_family = AF_INET6;
#endif
}
}
if (tb[NDA_PORT]) {
if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
return -EINVAL;
*port = nla_get_be16(tb[NDA_PORT]);
} else {
*port = vxlan->cfg.dst_port;
}
if (tb[NDA_VNI]) {
if (nla_len(tb[NDA_VNI]) != sizeof(u32))
return -EINVAL;
*vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
} else {
*vni = vxlan->default_dst.remote_vni;
}
if (tb[NDA_SRC_VNI]) {
if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32))
return -EINVAL;
*src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI]));
} else {
*src_vni = vxlan->default_dst.remote_vni;
}
if (tb[NDA_IFINDEX]) {
struct net_device *tdev;
if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
return -EINVAL;
*ifindex = nla_get_u32(tb[NDA_IFINDEX]);
tdev = __dev_get_by_index(net, *ifindex);
if (!tdev)
return -EADDRNOTAVAIL;
} else {
*ifindex = 0;
}
if (tb[NDA_NH_ID])
*nhid = nla_get_u32(tb[NDA_NH_ID]);
else
*nhid = 0;
return 0;
}
/* Add static entry (via netlink) */
static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
struct net_device *dev,
const unsigned char *addr, u16 vid, u16 flags,
struct netlink_ext_ack *extack)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
/* struct net *net = dev_net(vxlan->dev); */
union vxlan_addr ip;
__be16 port;
__be32 src_vni, vni;
u32 ifindex, nhid;
u32 hash_index;
int err;
if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_REACHABLE))) {
pr_info("RTM_NEWNEIGH with invalid state %#x\n",
ndm->ndm_state);
return -EINVAL;
}
if (!tb || (!tb[NDA_DST] && !tb[NDA_NH_ID]))
return -EINVAL;
err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex,
&nhid);
if (err)
return err;
if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
return -EAFNOSUPPORT;
hash_index = fdb_head_index(vxlan, addr, src_vni);
spin_lock_bh(&vxlan->hash_lock[hash_index]);
err = vxlan_fdb_update(vxlan, addr, &ip, ndm->ndm_state, flags,
port, src_vni, vni, ifindex,
ndm->ndm_flags | NTF_VXLAN_ADDED_BY_USER,
nhid, true, extack);
spin_unlock_bh(&vxlan->hash_lock[hash_index]);
return err;
}
static int __vxlan_fdb_delete(struct vxlan_dev *vxlan,
const unsigned char *addr, union vxlan_addr ip,
__be16 port, __be32 src_vni, __be32 vni,
u32 ifindex, bool swdev_notify)
{
struct vxlan_rdst *rd = NULL;
struct vxlan_fdb *f;
int err = -ENOENT;
f = vxlan_find_mac(vxlan, addr, src_vni);
if (!f)
return err;
if (!vxlan_addr_any(&ip)) {
rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
if (!rd)
goto out;
}
/* remove a destination if it's not the only one on the list,
* otherwise destroy the fdb entry
*/
if (rd && !list_is_singular(&f->remotes)) {
vxlan_fdb_dst_destroy(vxlan, f, rd, swdev_notify);
goto out;
}
vxlan_fdb_destroy(vxlan, f, true, swdev_notify);
out:
return 0;
}
/* Delete entry (via netlink) */
static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
struct net_device *dev,
const unsigned char *addr, u16 vid)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
union vxlan_addr ip;
__be32 src_vni, vni;
u32 ifindex, nhid;
u32 hash_index;
__be16 port;
int err;
err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex,
&nhid);
if (err)
return err;
hash_index = fdb_head_index(vxlan, addr, src_vni);
spin_lock_bh(&vxlan->hash_lock[hash_index]);
err = __vxlan_fdb_delete(vxlan, addr, ip, port, src_vni, vni, ifindex,
true);
spin_unlock_bh(&vxlan->hash_lock[hash_index]);
return err;
}
/* Dump forwarding table */
static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
struct net_device *dev,
struct net_device *filter_dev, int *idx)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
unsigned int h;
int err = 0;
for (h = 0; h < FDB_HASH_SIZE; ++h) {
struct vxlan_fdb *f;
rcu_read_lock();
hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
struct vxlan_rdst *rd;
if (rcu_access_pointer(f->nh)) {
if (*idx < cb->args[2])
goto skip_nh;
err = vxlan_fdb_info(skb, vxlan, f,
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq,
RTM_NEWNEIGH,
NLM_F_MULTI, NULL);
if (err < 0) {
rcu_read_unlock();
goto out;
}
skip_nh:
*idx += 1;
continue;
}
list_for_each_entry_rcu(rd, &f->remotes, list) {
if (*idx < cb->args[2])
goto skip;
err = vxlan_fdb_info(skb, vxlan, f,
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq,
RTM_NEWNEIGH,
NLM_F_MULTI, rd);
if (err < 0) {
rcu_read_unlock();
goto out;
}
skip:
*idx += 1;
}
}
rcu_read_unlock();
}
out:
return err;
}
static int vxlan_fdb_get(struct sk_buff *skb,
struct nlattr *tb[],
struct net_device *dev,
const unsigned char *addr,
u16 vid, u32 portid, u32 seq,
struct netlink_ext_ack *extack)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
struct vxlan_fdb *f;
__be32 vni;
int err;
if (tb[NDA_VNI])
vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
else
vni = vxlan->default_dst.remote_vni;
rcu_read_lock();
f = __vxlan_find_mac(vxlan, addr, vni);
if (!f) {
NL_SET_ERR_MSG(extack, "Fdb entry not found");
err = -ENOENT;
goto errout;
}
err = vxlan_fdb_info(skb, vxlan, f, portid, seq,
RTM_NEWNEIGH, 0, first_remote_rcu(f));
errout:
rcu_read_unlock();
return err;
}
/* Watch incoming packets to learn mapping between Ethernet address
* and Tunnel endpoint.
* Return true if packet is bogus and should be dropped.
*/
static bool vxlan_snoop(struct net_device *dev,
union vxlan_addr *src_ip, const u8 *src_mac,
u32 src_ifindex, __be32 vni)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
struct vxlan_fdb *f;
u32 ifindex = 0;
#if IS_ENABLED(CONFIG_IPV6)
if (src_ip->sa.sa_family == AF_INET6 &&
(ipv6_addr_type(&src_ip->sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL))
ifindex = src_ifindex;
#endif
f = vxlan_find_mac(vxlan, src_mac, vni);
if (likely(f)) {
struct vxlan_rdst *rdst = first_remote_rcu(f);
if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip) &&
rdst->remote_ifindex == ifindex))
return false;
/* Don't migrate static entries, drop packets */
if (f->state & (NUD_PERMANENT | NUD_NOARP))
return true;
/* Don't override an fdb with nexthop with a learnt entry */
if (rcu_access_pointer(f->nh))
return true;
if (net_ratelimit())
netdev_info(dev,
"%pM migrated from %pIS to %pIS\n",
src_mac, &rdst->remote_ip.sa, &src_ip->sa);
rdst->remote_ip = *src_ip;
f->updated = jiffies;
vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH, true, NULL);
} else {
u32 hash_index = fdb_head_index(vxlan, src_mac, vni);
/* learned new entry */
spin_lock(&vxlan->hash_lock[hash_index]);
/* close off race between vxlan_flush and incoming packets */
if (netif_running(dev))
vxlan_fdb_update(vxlan, src_mac, src_ip,
NUD_REACHABLE,
NLM_F_EXCL|NLM_F_CREATE,
vxlan->cfg.dst_port,
vni,
vxlan->default_dst.remote_vni,
ifindex, NTF_SELF, 0, true, NULL);
spin_unlock(&vxlan->hash_lock[hash_index]);
}
return false;
}
/* See if multicast group is already in use by other ID */
static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
{
struct vxlan_dev *vxlan;
struct vxlan_sock *sock4;
#if IS_ENABLED(CONFIG_IPV6)
struct vxlan_sock *sock6;
#endif
unsigned short family = dev->default_dst.remote_ip.sa.sa_family;
sock4 = rtnl_dereference(dev->vn4_sock);
/* The vxlan_sock is only used by dev, leaving group has
* no effect on other vxlan devices.
*/
if (family == AF_INET && sock4 && refcount_read(&sock4->refcnt) == 1)
return false;
#if IS_ENABLED(CONFIG_IPV6)
sock6 = rtnl_dereference(dev->vn6_sock);
if (family == AF_INET6 && sock6 && refcount_read(&sock6->refcnt) == 1)
return false;
#endif
list_for_each_entry(vxlan, &vn->vxlan_list, next) {
if (!netif_running(vxlan->dev) || vxlan == dev)
continue;
if (family == AF_INET &&
rtnl_dereference(vxlan->vn4_sock) != sock4)
continue;
#if IS_ENABLED(CONFIG_IPV6)
if (family == AF_INET6 &&
rtnl_dereference(vxlan->vn6_sock) != sock6)
continue;
#endif
if (!vxlan_addr_equal(&vxlan->default_dst.remote_ip,
&dev->default_dst.remote_ip))
continue;
if (vxlan->default_dst.remote_ifindex !=
dev->default_dst.remote_ifindex)
continue;
return true;
}
return false;
}
static bool __vxlan_sock_release_prep(struct vxlan_sock *vs)
{
struct vxlan_net *vn;
if (!vs)
return false;
if (!refcount_dec_and_test(&vs->refcnt))
return false;
vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
spin_lock(&vn->sock_lock);
hlist_del_rcu(&vs->hlist);
udp_tunnel_notify_del_rx_port(vs->sock,
(vs->flags & VXLAN_F_GPE) ?
UDP_TUNNEL_TYPE_VXLAN_GPE :
UDP_TUNNEL_TYPE_VXLAN);
spin_unlock(&vn->sock_lock);
return true;
}
static void vxlan_sock_release(struct vxlan_dev *vxlan)
{
struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
#if IS_ENABLED(CONFIG_IPV6)
struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
#endif
RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
synchronize_net();
vxlan_vs_del_dev(vxlan);
if (__vxlan_sock_release_prep(sock4)) {
udp_tunnel_sock_release(sock4->sock);
kfree(sock4);
}
#if IS_ENABLED(CONFIG_IPV6)
if (__vxlan_sock_release_prep(sock6)) {
udp_tunnel_sock_release(sock6->sock);
kfree(sock6);
}
#endif
}
/* Update multicast group membership when first VNI on
* multicast address is brought up
*/
static int vxlan_igmp_join(struct vxlan_dev *vxlan)
{
struct sock *sk;
union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
int ifindex = vxlan->default_dst.remote_ifindex;
int ret = -EINVAL;
if (ip->sa.sa_family == AF_INET) {
struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
struct ip_mreqn mreq = {
.imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
.imr_ifindex = ifindex,
};
sk = sock4->sock->sk;
lock_sock(sk);
ret = ip_mc_join_group(sk, &mreq);
release_sock(sk);
#if IS_ENABLED(CONFIG_IPV6)
} else {
struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
sk = sock6->sock->sk;
lock_sock(sk);
ret = ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
&ip->sin6.sin6_addr);
release_sock(sk);
#endif
}
return ret;
}
/* Inverse of vxlan_igmp_join when last VNI is brought down */
static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
{
struct sock *sk;
union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
int ifindex = vxlan->default_dst.remote_ifindex;
int ret = -EINVAL;
if (ip->sa.sa_family == AF_INET) {
struct vxlan_sock *sock4 = rtnl_dereference(vxlan->vn4_sock);
struct ip_mreqn mreq = {
.imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
.imr_ifindex = ifindex,
};
sk = sock4->sock->sk;
lock_sock(sk);
ret = ip_mc_leave_group(sk, &mreq);
release_sock(sk);
#if IS_ENABLED(CONFIG_IPV6)
} else {
struct vxlan_sock *sock6 = rtnl_dereference(vxlan->vn6_sock);
sk = sock6->sock->sk;
lock_sock(sk);
ret = ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
&ip->sin6.sin6_addr);
release_sock(sk);
#endif
}
return ret;
}
static bool vxlan_remcsum(struct vxlanhdr *unparsed,
struct sk_buff *skb, u32 vxflags)
{
size_t start, offset;
if (!(unparsed->vx_flags & VXLAN_HF_RCO) || skb->remcsum_offload)
goto out;
start = vxlan_rco_start(unparsed->vx_vni);
offset = start + vxlan_rco_offset(unparsed->vx_vni);
if (!pskb_may_pull(skb, offset + sizeof(u16)))
return false;
skb_remcsum_process(skb, (void *)(vxlan_hdr(skb) + 1), start, offset,
!!(vxflags & VXLAN_F_REMCSUM_NOPARTIAL));
out:
unparsed->vx_flags &= ~VXLAN_HF_RCO;
unparsed->vx_vni &= VXLAN_VNI_MASK;
return true;
}
static void vxlan_parse_gbp_hdr(struct vxlanhdr *unparsed,
struct sk_buff *skb, u32 vxflags,
struct vxlan_metadata *md)
{
struct vxlanhdr_gbp *gbp = (struct vxlanhdr_gbp *)unparsed;
struct metadata_dst *tun_dst;
if (!(unparsed->vx_flags & VXLAN_HF_GBP))
goto out;
md->gbp = ntohs(gbp->policy_id);
tun_dst = (struct metadata_dst *)skb_dst(skb);
if (tun_dst) {
tun_dst->u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
tun_dst->u.tun_info.options_len = sizeof(*md);
}
if (gbp->dont_learn)
md->gbp |= VXLAN_GBP_DONT_LEARN;
if (gbp->policy_applied)
md->gbp |= VXLAN_GBP_POLICY_APPLIED;
/* In flow-based mode, GBP is carried in dst_metadata */
if (!(vxflags & VXLAN_F_COLLECT_METADATA))
skb->mark = md->gbp;
out:
unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
}
static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed,
__be16 *protocol,
struct sk_buff *skb, u32 vxflags)
{
struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)unparsed;
/* Need to have Next Protocol set for interfaces in GPE mode. */
if (!gpe->np_applied)
return false;
/* "The initial version is 0. If a receiver does not support the
* version indicated it MUST drop the packet.
*/
if (gpe->version != 0)
return false;
/* "When the O bit is set to 1, the packet is an OAM packet and OAM
* processing MUST occur." However, we don't implement OAM
* processing, thus drop the packet.
*/
if (gpe->oam_flag)
return false;
*protocol = tun_p_to_eth_p(gpe->next_protocol);
if (!*protocol)
return false;
unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS;
return true;
}
static bool vxlan_set_mac(struct vxlan_dev *vxlan,
struct vxlan_sock *vs,
struct sk_buff *skb, __be32 vni)
{
union vxlan_addr saddr;
u32 ifindex = skb->dev->ifindex;
skb_reset_mac_header(skb);
skb->protocol = eth_type_trans(skb, vxlan->dev);
skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
/* Ignore packet loops (and multicast echo) */
if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
return false;
/* Get address from the outer IP header */
if (vxlan_get_sk_family(vs) == AF_INET) {
saddr.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
saddr.sa.sa_family = AF_INET;
#if IS_ENABLED(CONFIG_IPV6)
} else {
saddr.sin6.sin6_addr = ipv6_hdr(skb)->saddr;
saddr.sa.sa_family = AF_INET6;
#endif
}
if ((vxlan->cfg.flags & VXLAN_F_LEARN) &&
vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source, ifindex, vni))
return false;
return true;
}
static bool vxlan_ecn_decapsulate(struct vxlan_sock *vs, void *oiph,
struct sk_buff *skb)
{
int err = 0;
if (vxlan_get_sk_family(vs) == AF_INET)
err = IP_ECN_decapsulate(oiph, skb);
#if IS_ENABLED(CONFIG_IPV6)
else
err = IP6_ECN_decapsulate(oiph, skb);
#endif
if (unlikely(err) && log_ecn_error) {
if (vxlan_get_sk_family(vs) == AF_INET)
net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
&((struct iphdr *)oiph)->saddr,
((struct iphdr *)oiph)->tos);
else
net_info_ratelimited("non-ECT from %pI6\n",
&((struct ipv6hdr *)oiph)->saddr);
}
return err <= 1;
}
/* Callback from net/ipv4/udp.c to receive packets */
static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
{
struct pcpu_sw_netstats *stats;
struct vxlan_dev *vxlan;
struct vxlan_sock *vs;
struct vxlanhdr unparsed;
struct vxlan_metadata _md;
struct vxlan_metadata *md = &_md;
__be16 protocol = htons(ETH_P_TEB);
bool raw_proto = false;
void *oiph;
__be32 vni = 0;
/* Need UDP and VXLAN header to be present */
if (!pskb_may_pull(skb, VXLAN_HLEN))
goto drop;
unparsed = *vxlan_hdr(skb);
/* VNI flag always required to be set */
if (!(unparsed.vx_flags & VXLAN_HF_VNI)) {
netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
ntohl(vxlan_hdr(skb)->vx_flags),
ntohl(vxlan_hdr(skb)->vx_vni));
/* Return non vxlan pkt */
goto drop;
}
unparsed.vx_flags &= ~VXLAN_HF_VNI;
unparsed.vx_vni &= ~VXLAN_VNI_MASK;
vs = rcu_dereference_sk_user_data(sk);
if (!vs)
goto drop;
vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni);
if (!vxlan)
goto drop;
/* For backwards compatibility, only allow reserved fields to be
* used by VXLAN extensions if explicitly requested.
*/
if (vs->flags & VXLAN_F_GPE) {
if (!vxlan_parse_gpe_hdr(&unparsed, &protocol, skb, vs->flags))
goto drop;
raw_proto = true;
}
if (__iptunnel_pull_header(skb, VXLAN_HLEN, protocol, raw_proto,
!net_eq(vxlan->net, dev_net(vxlan->dev))))
goto drop;
if (vxlan_collect_metadata(vs)) {
struct metadata_dst *tun_dst;
tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), TUNNEL_KEY,
key32_to_tunnel_id(vni), sizeof(*md));
if (!tun_dst)
goto drop;
md = ip_tunnel_info_opts(&tun_dst->u.tun_info);
skb_dst_set(skb, (struct dst_entry *)tun_dst);
} else {
memset(md, 0, sizeof(*md));
}
if (vs->flags & VXLAN_F_REMCSUM_RX)
if (!vxlan_remcsum(&unparsed, skb, vs->flags))
goto drop;
if (vs->flags & VXLAN_F_GBP)
vxlan_parse_gbp_hdr(&unparsed, skb, vs->flags, md);
/* Note that GBP and GPE can never be active together. This is
* ensured in vxlan_dev_configure.
*/
if (unparsed.vx_flags || unparsed.vx_vni) {
/* If there are any unprocessed flags remaining treat
* this as a malformed packet. This behavior diverges from
* VXLAN RFC (RFC7348) which stipulates that bits in reserved
* in reserved fields are to be ignored. The approach here
* maintains compatibility with previous stack code, and also
* is more robust and provides a little more security in
* adding extensions to VXLAN.
*/
goto drop;
}
if (!raw_proto) {
if (!vxlan_set_mac(vxlan, vs, skb, vni))
goto drop;
} else {
skb_reset_mac_header(skb);
skb->dev = vxlan->dev;
skb->pkt_type = PACKET_HOST;
}
oiph = skb_network_header(skb);
skb_reset_network_header(skb);
if (!vxlan_ecn_decapsulate(vs, oiph, skb)) {
++vxlan->dev->stats.rx_frame_errors;
++vxlan->dev->stats.rx_errors;
goto drop;
}
rcu_read_lock();
if (unlikely(!(vxlan->dev->flags & IFF_UP))) {
rcu_read_unlock();
atomic_long_inc(&vxlan->dev->rx_dropped);
goto drop;
}
stats = this_cpu_ptr(vxlan->dev->tstats);
u64_stats_update_begin(&stats->syncp);
stats->rx_packets++;
stats->rx_bytes += skb->len;
u64_stats_update_end(&stats->syncp);
gro_cells_receive(&vxlan->gro_cells, skb);
rcu_read_unlock();
return 0;
drop:
/* Consume bad packet */
kfree_skb(skb);
return 0;
}
/* Callback from net/ipv{4,6}/udp.c to check that we have a VNI for errors */
static int vxlan_err_lookup(struct sock *sk, struct sk_buff *skb)
{
struct vxlan_dev *vxlan;
struct vxlan_sock *vs;
struct vxlanhdr *hdr;
__be32 vni;
if (!pskb_may_pull(skb, skb_transport_offset(skb) + VXLAN_HLEN))
return -EINVAL;
hdr = vxlan_hdr(skb);
if (!(hdr->vx_flags & VXLAN_HF_VNI))
return -EINVAL;
vs = rcu_dereference_sk_user_data(sk);
if (!vs)
return -ENOENT;
vni = vxlan_vni(hdr->vx_vni);
vxlan = vxlan_vs_find_vni(vs, skb->dev->ifindex, vni);
if (!vxlan)
return -ENOENT;
return 0;
}
static int arp_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
struct arphdr *parp;
u8 *arpptr, *sha;
__be32 sip, tip;
struct neighbour *n;
if (dev->flags & IFF_NOARP)
goto out;
if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
dev->stats.tx_dropped++;
goto out;
}
parp = arp_hdr(skb);
if ((parp->ar_hrd != htons(ARPHRD_ETHER) &&
parp->ar_hrd != htons(ARPHRD_IEEE802)) ||
parp->ar_pro != htons(ETH_P_IP) ||
parp->ar_op != htons(ARPOP_REQUEST) ||
parp->ar_hln != dev->addr_len ||
parp->ar_pln != 4)
goto out;
arpptr = (u8 *)parp + sizeof(struct arphdr);
sha = arpptr;
arpptr += dev->addr_len; /* sha */
memcpy(&sip, arpptr, sizeof(sip));
arpptr += sizeof(sip);
arpptr += dev->addr_len; /* tha */
memcpy(&tip, arpptr, sizeof(tip));
if (ipv4_is_loopback(tip) ||
ipv4_is_multicast(tip))
goto out;
n = neigh_lookup(&arp_tbl, &tip, dev);
if (n) {
struct vxlan_fdb *f;
struct sk_buff *reply;
if (!(n->nud_state & NUD_CONNECTED)) {
neigh_release(n);
goto out;
}
f = vxlan_find_mac(vxlan, n->ha, vni);
if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
/* bridge-local neighbor */
neigh_release(n);
goto out;
}
reply = arp_create(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
n->ha, sha);
neigh_release(n);
if (reply == NULL)
goto out;
skb_reset_mac_header(reply);
__skb_pull(reply, skb_network_offset(reply));
reply->ip_summed = CHECKSUM_UNNECESSARY;
reply->pkt_type = PACKET_HOST;
if (netif_rx_ni(reply) == NET_RX_DROP)
dev->stats.rx_dropped++;
} else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
union vxlan_addr ipa = {
.sin.sin_addr.s_addr = tip,
.sin.sin_family = AF_INET,
};
vxlan_ip_miss(dev, &ipa);
}
out:
consume_skb(skb);
return NETDEV_TX_OK;
}
#if IS_ENABLED(CONFIG_IPV6)
static struct sk_buff *vxlan_na_create(struct sk_buff *request,
struct neighbour *n, bool isrouter)
{
struct net_device *dev = request->dev;
struct sk_buff *reply;
struct nd_msg *ns, *na;
struct ipv6hdr *pip6;
u8 *daddr;
int na_olen = 8; /* opt hdr + ETH_ALEN for target */
int ns_olen;
int i, len;
if (dev == NULL || !pskb_may_pull(request, request->len))
return NULL;
len = LL_RESERVED_SPACE(dev) + sizeof(struct ipv6hdr) +
sizeof(*na) + na_olen + dev->needed_tailroom;
reply = alloc_skb(len, GFP_ATOMIC);
if (reply == NULL)
return NULL;
reply->protocol = htons(ETH_P_IPV6);
reply->dev = dev;
skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
skb_push(reply, sizeof(struct ethhdr));
skb_reset_mac_header(reply);
ns = (struct nd_msg *)(ipv6_hdr(request) + 1);
daddr = eth_hdr(request)->h_source;
ns_olen = request->len - skb_network_offset(request) -
sizeof(struct ipv6hdr) - sizeof(*ns);
for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
if (!ns->opt[i + 1]) {
kfree_skb(reply);
return NULL;
}
if (ns->opt[i] == ND_OPT_SOURCE_LL_ADDR) {
daddr = ns->opt + i + sizeof(struct nd_opt_hdr);
break;
}
}
/* Ethernet header */
ether_addr_copy(eth_hdr(reply)->h_dest, daddr);
ether_addr_copy(eth_hdr(reply)->h_source, n->ha);
eth_hdr(reply)->h_proto = htons(ETH_P_IPV6);
reply->protocol = htons(ETH_P_IPV6);
skb_pull(reply, sizeof(struct ethhdr));
skb_reset_network_header(reply);
skb_put(reply, sizeof(struct ipv6hdr));
/* IPv6 header */
pip6 = ipv6_hdr(reply);
memset(pip6, 0, sizeof(struct ipv6hdr));
pip6->version = 6;
pip6->priority = ipv6_hdr(request)->priority;
pip6->nexthdr = IPPROTO_ICMPV6;
pip6->hop_limit = 255;
pip6->daddr = ipv6_hdr(request)->saddr;
pip6->saddr = *(struct in6_addr *)n->primary_key;
skb_pull(reply, sizeof(struct ipv6hdr));
skb_reset_transport_header(reply);
/* Neighbor Advertisement */
na = skb_put_zero(reply, sizeof(*na) + na_olen);
na->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
na->icmph.icmp6_router = isrouter;
na->icmph.icmp6_override = 1;
na->icmph.icmp6_solicited = 1;
na->target = ns->target;
ether_addr_copy(&na->opt[2], n->ha);
na->opt[0] = ND_OPT_TARGET_LL_ADDR;
na->opt[1] = na_olen >> 3;
na->icmph.icmp6_cksum = csum_ipv6_magic(&pip6->saddr,
&pip6->daddr, sizeof(*na)+na_olen, IPPROTO_ICMPV6,
csum_partial(na, sizeof(*na)+na_olen, 0));
pip6->payload_len = htons(sizeof(*na)+na_olen);
skb_push(reply, sizeof(struct ipv6hdr));
reply->ip_summed = CHECKSUM_UNNECESSARY;
return reply;
}
static int neigh_reduce(struct net_device *dev, struct sk_buff *skb, __be32 vni)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
const struct in6_addr *daddr;
const struct ipv6hdr *iphdr;
struct inet6_dev *in6_dev;
struct neighbour *n;
struct nd_msg *msg;
in6_dev = __in6_dev_get(dev);
if (!in6_dev)
goto out;
iphdr = ipv6_hdr(skb);
daddr = &iphdr->daddr;
msg = (struct nd_msg *)(iphdr + 1);
if (ipv6_addr_loopback(daddr) ||
ipv6_addr_is_multicast(&msg->target))
goto out;
n = neigh_lookup(ipv6_stub->nd_tbl, &msg->target, dev);
if (n) {
struct vxlan_fdb *f;
struct sk_buff *reply;
if (!(n->nud_state & NUD_CONNECTED)) {
neigh_release(n);
goto out;
}
f = vxlan_find_mac(vxlan, n->ha, vni);
if (f && vxlan_addr_any(&(first_remote_rcu(f)->remote_ip))) {
/* bridge-local neighbor */
neigh_release(n);
goto out;
}
reply = vxlan_na_create(skb, n,
!!(f ? f->flags & NTF_ROUTER : 0));
neigh_release(n);
if (reply == NULL)
goto out;
if (netif_rx_ni(reply) == NET_RX_DROP)
dev->stats.rx_dropped++;
} else if (vxlan->cfg.flags & VXLAN_F_L3MISS) {
union vxlan_addr ipa = {
.sin6.sin6_addr = msg->target,
.sin6.sin6_family = AF_INET6,
};
vxlan_ip_miss(dev, &ipa);
}
out:
consume_skb(skb);
return NETDEV_TX_OK;
}
#endif
static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
struct neighbour *n;
if (is_multicast_ether_addr(eth_hdr(skb)->h_dest))
return false;
n = NULL;
switch (ntohs(eth_hdr(skb)->h_proto)) {
case ETH_P_IP:
{
struct iphdr *pip;
if (!pskb_may_pull(skb, sizeof(struct iphdr)))
return false;
pip = ip_hdr(skb);
n = neigh_lookup(&arp_tbl, &pip->daddr, dev);
if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
union vxlan_addr ipa = {
.sin.sin_addr.s_addr = pip->daddr,
.sin.sin_family = AF_INET,
};
vxlan_ip_miss(dev, &ipa);
return false;
}
break;
}
#if IS_ENABLED(CONFIG_IPV6)
case ETH_P_IPV6:
{
struct ipv6hdr *pip6;
if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
return false;
pip6 = ipv6_hdr(skb);
n = neigh_lookup(ipv6_stub->nd_tbl, &pip6->daddr, dev);
if (!n && (vxlan->cfg.flags & VXLAN_F_L3MISS)) {
union vxlan_addr ipa = {
.sin6.sin6_addr = pip6->daddr,
.sin6.sin6_family = AF_INET6,
};
vxlan_ip_miss(dev, &ipa);
return false;
}
break;
}
#endif
default:
return false;
}
if (n) {
bool diff;
diff = !ether_addr_equal(eth_hdr(skb)->h_dest, n->ha);
if (diff) {
memcpy(eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
dev->addr_len);
memcpy(eth_hdr(skb)->h_dest, n->ha, dev->addr_len);
}
neigh_release(n);
return diff;
}
return false;
}
static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
struct vxlan_metadata *md)
{
struct vxlanhdr_gbp *gbp;
if (!md->gbp)
return;
gbp = (struct vxlanhdr_gbp *)vxh;
vxh->vx_flags |= VXLAN_HF_GBP;
if (md->gbp & VXLAN_GBP_DONT_LEARN)
gbp->dont_learn = 1;
if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
gbp->policy_applied = 1;
gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
}
static int vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags,
__be16 protocol)
{
struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
gpe->np_applied = 1;
gpe->next_protocol = tun_p_from_eth_p(protocol);
if (!gpe->next_protocol)
return -EPFNOSUPPORT;
return 0;
}
static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
int iphdr_len, __be32 vni,
struct vxlan_metadata *md, u32 vxflags,
bool udp_sum)
{
struct vxlanhdr *vxh;
int min_headroom;
int err;
int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
__be16 inner_protocol = htons(ETH_P_TEB);
if ((vxflags & VXLAN_F_REMCSUM_TX) &&
skb->ip_summed == CHECKSUM_PARTIAL) {
int csum_start = skb_checksum_start_offset(skb);
if (csum_start <= VXLAN_MAX_REMCSUM_START &&
!(csum_start & VXLAN_RCO_SHIFT_MASK) &&
(skb->csum_offset == offsetof(struct udphdr, check) ||
skb->csum_offset == offsetof(struct tcphdr, check)))
type |= SKB_GSO_TUNNEL_REMCSUM;
}
min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
+ VXLAN_HLEN + iphdr_len;
/* Need space for new headers (invalidates iph ptr) */
err = skb_cow_head(skb, min_headroom);
if (unlikely(err))
return err;
err = iptunnel_handle_offloads(skb, type);
if (err)
return err;
vxh = __skb_push(skb, sizeof(*vxh));
vxh->vx_flags = VXLAN_HF_VNI;
vxh->vx_vni = vxlan_vni_field(vni);
if (type & SKB_GSO_TUNNEL_REMCSUM) {
unsigned int start;
start = skb_checksum_start_offset(skb) - sizeof(struct vxlanhdr);
vxh->vx_vni |= vxlan_compute_rco(start, skb->csum_offset);
vxh->vx_flags |= VXLAN_HF_RCO;
if (!skb_is_gso(skb)) {
skb->ip_summed = CHECKSUM_NONE;
skb->encapsulation = 0;
}
}
if (vxflags & VXLAN_F_GBP)
vxlan_build_gbp_hdr(vxh, vxflags, md);
if (vxflags & VXLAN_F_GPE) {
err = vxlan_build_gpe_hdr(vxh, vxflags, skb->protocol);
if (err < 0)
return err;
inner_protocol = skb->protocol;
}
skb_set_inner_protocol(skb, inner_protocol);
return 0;
}
static struct rtable *vxlan_get_route(struct vxlan_dev *vxlan, struct net_device *dev,
struct vxlan_sock *sock4,
struct sk_buff *skb, int oif, u8 tos,
__be32 daddr, __be32 *saddr, __be16 dport, __be16 sport,
struct dst_cache *dst_cache,
const struct ip_tunnel_info *info)
{
bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
struct rtable *rt = NULL;
struct flowi4 fl4;
if (!sock4)
return ERR_PTR(-EIO);
if (tos && !info)
use_cache = false;
if (use_cache) {
rt = dst_cache_get_ip4(dst_cache, saddr);
if (rt)
return rt;
}
memset(&fl4, 0, sizeof(fl4));
fl4.flowi4_oif = oif;
fl4.flowi4_tos = RT_TOS(tos);
fl4.flowi4_mark = skb->mark;
fl4.flowi4_proto = IPPROTO_UDP;
fl4.daddr = daddr;
fl4.saddr = *saddr;
fl4.fl4_dport = dport;
fl4.fl4_sport = sport;
rt = ip_route_output_key(vxlan->net, &fl4);
if (!IS_ERR(rt)) {
if (rt->dst.dev == dev) {
netdev_dbg(dev, "circular route to %pI4\n", &daddr);
ip_rt_put(rt);
return ERR_PTR(-ELOOP);
}
*saddr = fl4.saddr;
if (use_cache)
dst_cache_set_ip4(dst_cache, &rt->dst, fl4.saddr);
} else {
netdev_dbg(dev, "no route to %pI4\n", &daddr);
return ERR_PTR(-ENETUNREACH);
}
return rt;
}
#if IS_ENABLED(CONFIG_IPV6)
static struct dst_entry *vxlan6_get_route(struct vxlan_dev *vxlan,
struct net_device *dev,
struct vxlan_sock *sock6,
struct sk_buff *skb, int oif, u8 tos,
__be32 label,
const struct in6_addr *daddr,
struct in6_addr *saddr,
__be16 dport, __be16 sport,
struct dst_cache *dst_cache,
const struct ip_tunnel_info *info)
{
bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
struct dst_entry *ndst;
struct flowi6 fl6;
if (!sock6)
return ERR_PTR(-EIO);
if (tos && !info)
use_cache = false;
if (use_cache) {
ndst = dst_cache_get_ip6(dst_cache, saddr);
if (ndst)
return ndst;
}
memset(&fl6, 0, sizeof(fl6));
fl6.flowi6_oif = oif;
fl6.daddr = *daddr;
fl6.saddr = *saddr;
fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
fl6.flowi6_mark = skb->mark;
fl6.flowi6_proto = IPPROTO_UDP;
fl6.fl6_dport = dport;
fl6.fl6_sport = sport;
ndst = ipv6_stub->ipv6_dst_lookup_flow(vxlan->net, sock6->sock->sk,
&fl6, NULL);
if (unlikely(IS_ERR(ndst))) {
netdev_dbg(dev, "no route to %pI6\n", daddr);
return ERR_PTR(-ENETUNREACH);
}
if (unlikely(ndst->dev == dev)) {
netdev_dbg(dev, "circular route to %pI6\n", daddr);
dst_release(ndst);
return ERR_PTR(-ELOOP);
}
*saddr = fl6.saddr;
if (use_cache)
dst_cache_set_ip6(dst_cache, ndst, saddr);
return ndst;
}
#endif
/* Bypass encapsulation if the destination is local */
static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
struct vxlan_dev *dst_vxlan, __be32 vni,
bool snoop)
{
struct pcpu_sw_netstats *tx_stats, *rx_stats;
union vxlan_addr loopback;
union vxlan_addr *remote_ip = &dst_vxlan->default_dst.remote_ip;
struct net_device *dev;
int len = skb->len;
tx_stats = this_cpu_ptr(src_vxlan->dev->tstats);
rx_stats = this_cpu_ptr(dst_vxlan->dev->tstats);
skb->pkt_type = PACKET_HOST;
skb->encapsulation = 0;
skb->dev = dst_vxlan->dev;
__skb_pull(skb, skb_network_offset(skb));
if (remote_ip->sa.sa_family == AF_INET) {
loopback.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
loopback.sa.sa_family = AF_INET;
#if IS_ENABLED(CONFIG_IPV6)
} else {
loopback.sin6.sin6_addr = in6addr_loopback;
loopback.sa.sa_family = AF_INET6;
#endif
}
rcu_read_lock();
dev = skb->dev;
if (unlikely(!(dev->flags & IFF_UP))) {
kfree_skb(skb);
goto drop;
}
if ((dst_vxlan->cfg.flags & VXLAN_F_LEARN) && snoop)
vxlan_snoop(dev, &loopback, eth_hdr(skb)->h_source, 0, vni);
u64_stats_update_begin(&tx_stats->syncp);
tx_stats->tx_packets++;
tx_stats->tx_bytes += len;
u64_stats_update_end(&tx_stats->syncp);
if (netif_rx(skb) == NET_RX_SUCCESS) {
u64_stats_update_begin(&rx_stats->syncp);
rx_stats->rx_packets++;
rx_stats->rx_bytes += len;
u64_stats_update_end(&rx_stats->syncp);
} else {
drop:
dev->stats.rx_dropped++;
}
rcu_read_unlock();
}
static int encap_bypass_if_local(struct sk_buff *skb, struct net_device *dev,
struct vxlan_dev *vxlan,
union vxlan_addr *daddr,
__be16 dst_port, int dst_ifindex, __be32 vni,
struct dst_entry *dst,
u32 rt_flags)
{
#if IS_ENABLED(CONFIG_IPV6)
/* IPv6 rt-flags are checked against RTF_LOCAL, but the value of
* RTF_LOCAL is equal to RTCF_LOCAL. So to keep code simple
* we can use RTCF_LOCAL which works for ipv4 and ipv6 route entry.
*/
BUILD_BUG_ON(RTCF_LOCAL != RTF_LOCAL);
#endif
/* Bypass encapsulation if the destination is local */
if (rt_flags & RTCF_LOCAL &&
!(rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
struct vxlan_dev *dst_vxlan;
dst_release(dst);
dst_vxlan = vxlan_find_vni(vxlan->net, dst_ifindex, vni,
daddr->sa.sa_family, dst_port,
vxlan->cfg.flags);
if (!dst_vxlan) {
dev->stats.tx_errors++;
kfree_skb(skb);
return -ENOENT;
}
vxlan_encap_bypass(skb, vxlan, dst_vxlan, vni, true);
return 1;
}
return 0;
}
static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
__be32 default_vni, struct vxlan_rdst *rdst,
bool did_rsc)
{
struct dst_cache *dst_cache;
struct ip_tunnel_info *info;
struct vxlan_dev *vxlan = netdev_priv(dev);
const struct iphdr *old_iph = ip_hdr(skb);
union vxlan_addr *dst;
union vxlan_addr remote_ip, local_ip;
struct vxlan_metadata _md;
struct vxlan_metadata *md = &_md;
__be16 src_port = 0, dst_port;
struct dst_entry *ndst = NULL;
__be32 vni, label;
__u8 tos, ttl;
int ifindex;
int err;
u32 flags = vxlan->cfg.flags;
bool udp_sum = false;
bool xnet = !net_eq(vxlan->net, dev_net(vxlan->dev));
info = skb_tunnel_info(skb);
if (rdst) {
dst = &rdst->remote_ip;
if (vxlan_addr_any(dst)) {
if (did_rsc) {
/* short-circuited back to local bridge */
vxlan_encap_bypass(skb, vxlan, vxlan,
default_vni, true);
return;
}
goto drop;
}
dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
vni = (rdst->remote_vni) ? : default_vni;
ifindex = rdst->remote_ifindex;
local_ip = vxlan->cfg.saddr;
dst_cache = &rdst->dst_cache;
md->gbp = skb->mark;
if (flags & VXLAN_F_TTL_INHERIT) {
ttl = ip_tunnel_get_ttl(old_iph, skb);
} else {
ttl = vxlan->cfg.ttl;
if (!ttl && vxlan_addr_multicast(dst))
ttl = 1;
}
tos = vxlan->cfg.tos;
if (tos == 1)
tos = ip_tunnel_get_dsfield(old_iph, skb);
if (dst->sa.sa_family == AF_INET)
udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM_TX);
else
udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
label = vxlan->cfg.label;
} else {
if (!info) {
WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
dev->name);
goto drop;
}
remote_ip.sa.sa_family = ip_tunnel_info_af(info);
if (remote_ip.sa.sa_family == AF_INET) {
remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
local_ip.sin.sin_addr.s_addr = info->key.u.ipv4.src;
} else {
remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
local_ip.sin6.sin6_addr = info->key.u.ipv6.src;
}
dst = &remote_ip;
dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
vni = tunnel_id_to_key32(info->key.tun_id);
ifindex = 0;
dst_cache = &info->dst_cache;
if (info->key.tun_flags & TUNNEL_VXLAN_OPT) {
if (info->options_len < sizeof(*md))
goto drop;
md = ip_tunnel_info_opts(info);
}
ttl = info->key.ttl;
tos = info->key.tos;
label = info->key.label;
udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
}
src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
vxlan->cfg.port_max, true);
rcu_read_lock();
if (dst->sa.sa_family == AF_INET) {
struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
struct rtable *rt;
__be16 df = 0;
if (!ifindex)
ifindex = sock4->sock->sk->sk_bound_dev_if;
rt = vxlan_get_route(vxlan, dev, sock4, skb, ifindex, tos,
dst->sin.sin_addr.s_addr,
&local_ip.sin.sin_addr.s_addr,
dst_port, src_port,
dst_cache, info);
if (IS_ERR(rt)) {
err = PTR_ERR(rt);
goto tx_error;
}
if (!info) {
/* Bypass encapsulation if the destination is local */
err = encap_bypass_if_local(skb, dev, vxlan, dst,
dst_port, ifindex, vni,
&rt->dst, rt->rt_flags);
if (err)
goto out_unlock;
if (vxlan->cfg.df == VXLAN_DF_SET) {
df = htons(IP_DF);
} else if (vxlan->cfg.df == VXLAN_DF_INHERIT) {
struct ethhdr *eth = eth_hdr(skb);
if (ntohs(eth->h_proto) == ETH_P_IPV6 ||
(ntohs(eth->h_proto) == ETH_P_IP &&
old_iph->frag_off & htons(IP_DF)))
df = htons(IP_DF);
}
} else if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT) {
df = htons(IP_DF);
}
ndst = &rt->dst;
err = skb_tunnel_check_pmtu(skb, ndst, VXLAN_HEADROOM,
netif_is_any_bridge_port(dev));
if (err < 0) {
goto tx_error;
} else if (err) {
if (info) {
struct in_addr src, dst;
src = remote_ip.sin.sin_addr;
dst = local_ip.sin.sin_addr;
info->key.u.ipv4.src = src.s_addr;
info->key.u.ipv4.dst = dst.s_addr;
}
vxlan_encap_bypass(skb, vxlan, vxlan, vni, false);
dst_release(ndst);
goto out_unlock;
}
tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
err = vxlan_build_skb(skb, ndst, sizeof(struct iphdr),
vni, md, flags, udp_sum);
if (err < 0)
goto tx_error;
udp_tunnel_xmit_skb(rt, sock4->sock->sk, skb, local_ip.sin.sin_addr.s_addr,
dst->sin.sin_addr.s_addr, tos, ttl, df,
src_port, dst_port, xnet, !udp_sum);
#if IS_ENABLED(CONFIG_IPV6)
} else {
struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
if (!ifindex)
ifindex = sock6->sock->sk->sk_bound_dev_if;
ndst = vxlan6_get_route(vxlan, dev, sock6, skb, ifindex, tos,
label, &dst->sin6.sin6_addr,
&local_ip.sin6.sin6_addr,
dst_port, src_port,
dst_cache, info);
if (IS_ERR(ndst)) {
err = PTR_ERR(ndst);
ndst = NULL;
goto tx_error;
}
if (!info) {
u32 rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
err = encap_bypass_if_local(skb, dev, vxlan, dst,
dst_port, ifindex, vni,
ndst, rt6i_flags);
if (err)
goto out_unlock;
}
err = skb_tunnel_check_pmtu(skb, ndst, VXLAN6_HEADROOM,
netif_is_any_bridge_port(dev));
if (err < 0) {
goto tx_error;
} else if (err) {
if (info) {
struct in6_addr src, dst;
src = remote_ip.sin6.sin6_addr;
dst = local_ip.sin6.sin6_addr;
info->key.u.ipv6.src = src;
info->key.u.ipv6.dst = dst;
}
vxlan_encap_bypass(skb, vxlan, vxlan, vni, false);
dst_release(ndst);
goto out_unlock;
}
tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
ttl = ttl ? : ip6_dst_hoplimit(ndst);
skb_scrub_packet(skb, xnet);
err = vxlan_build_skb(skb, ndst, sizeof(struct ipv6hdr),
vni, md, flags, udp_sum);
if (err < 0)
goto tx_error;
udp_tunnel6_xmit_skb(ndst, sock6->sock->sk, skb, dev,
&local_ip.sin6.sin6_addr,
&dst->sin6.sin6_addr, tos, ttl,
label, src_port, dst_port, !udp_sum);
#endif
}
out_unlock:
rcu_read_unlock();
return;
drop:
dev->stats.tx_dropped++;
dev_kfree_skb(skb);
return;
tx_error:
rcu_read_unlock();
if (err == -ELOOP)
dev->stats.collisions++;
else if (err == -ENETUNREACH)
dev->stats.tx_carrier_errors++;
dst_release(ndst);
dev->stats.tx_errors++;
kfree_skb(skb);
}
static void vxlan_xmit_nh(struct sk_buff *skb, struct net_device *dev,
struct vxlan_fdb *f, __be32 vni, bool did_rsc)
{
struct vxlan_rdst nh_rdst;
struct nexthop *nh;
bool do_xmit;
u32 hash;
memset(&nh_rdst, 0, sizeof(struct vxlan_rdst));
hash = skb_get_hash(skb);
rcu_read_lock();
nh = rcu_dereference(f->nh);
if (!nh) {
rcu_read_unlock();
goto drop;
}
do_xmit = vxlan_fdb_nh_path_select(nh, hash, &nh_rdst);
rcu_read_unlock();
if (likely(do_xmit))
vxlan_xmit_one(skb, dev, vni, &nh_rdst, did_rsc);
else
goto drop;
return;
drop:
dev->stats.tx_dropped++;
dev_kfree_skb(skb);
}
/* Transmit local packets over Vxlan
*
* Outer IP header inherits ECN and DF from inner header.
* Outer UDP destination is the VXLAN assigned port.
* source port is based on hash of flow
*/
static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
struct vxlan_rdst *rdst, *fdst = NULL;
const struct ip_tunnel_info *info;
bool did_rsc = false;
struct vxlan_fdb *f;
struct ethhdr *eth;
__be32 vni = 0;
info = skb_tunnel_info(skb);
skb_reset_mac_header(skb);
if (vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA) {
if (info && info->mode & IP_TUNNEL_INFO_BRIDGE &&
info->mode & IP_TUNNEL_INFO_TX) {
vni = tunnel_id_to_key32(info->key.tun_id);
} else {
if (info && info->mode & IP_TUNNEL_INFO_TX)
vxlan_xmit_one(skb, dev, vni, NULL, false);
else
kfree_skb(skb);
return NETDEV_TX_OK;
}
}
if (vxlan->cfg.flags & VXLAN_F_PROXY) {
eth = eth_hdr(skb);
if (ntohs(eth->h_proto) == ETH_P_ARP)
return arp_reduce(dev, skb, vni);
#if IS_ENABLED(CONFIG_IPV6)
else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
pskb_may_pull(skb, sizeof(struct ipv6hdr) +
sizeof(struct nd_msg)) &&
ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
struct nd_msg *m = (struct nd_msg *)(ipv6_hdr(skb) + 1);
if (m->icmph.icmp6_code == 0 &&
m->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
return neigh_reduce(dev, skb, vni);
}
#endif
}
eth = eth_hdr(skb);
f = vxlan_find_mac(vxlan, eth->h_dest, vni);
did_rsc = false;
if (f && (f->flags & NTF_ROUTER) && (vxlan->cfg.flags & VXLAN_F_RSC) &&
(ntohs(eth->h_proto) == ETH_P_IP ||
ntohs(eth->h_proto) == ETH_P_IPV6)) {
did_rsc = route_shortcircuit(dev, skb);
if (did_rsc)
f = vxlan_find_mac(vxlan, eth->h_dest, vni);
}
if (f == NULL) {
f = vxlan_find_mac(vxlan, all_zeros_mac, vni);
if (f == NULL) {
if ((vxlan->cfg.flags & VXLAN_F_L2MISS) &&
!is_multicast_ether_addr(eth->h_dest))
vxlan_fdb_miss(vxlan, eth->h_dest);
dev->stats.tx_dropped++;
kfree_skb(skb);
return NETDEV_TX_OK;
}
}
if (rcu_access_pointer(f->nh)) {
vxlan_xmit_nh(skb, dev, f,
(vni ? : vxlan->default_dst.remote_vni), did_rsc);
} else {
list_for_each_entry_rcu(rdst, &f->remotes, list) {
struct sk_buff *skb1;
if (!fdst) {
fdst = rdst;
continue;
}
skb1 = skb_clone(skb, GFP_ATOMIC);
if (skb1)
vxlan_xmit_one(skb1, dev, vni, rdst, did_rsc);
}
if (fdst)
vxlan_xmit_one(skb, dev, vni, fdst, did_rsc);
else
kfree_skb(skb);
}
return NETDEV_TX_OK;
}
/* Walk the forwarding table and purge stale entries */
static void vxlan_cleanup(struct timer_list *t)
{
struct vxlan_dev *vxlan = from_timer(vxlan, t, age_timer);
unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
unsigned int h;
if (!netif_running(vxlan->dev))
return;
for (h = 0; h < FDB_HASH_SIZE; ++h) {
struct hlist_node *p, *n;
spin_lock(&vxlan->hash_lock[h]);
hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
struct vxlan_fdb *f
= container_of(p, struct vxlan_fdb, hlist);
unsigned long timeout;
if (f->state & (NUD_PERMANENT | NUD_NOARP))
continue;
if (f->flags & NTF_EXT_LEARNED)
continue;
timeout = f->used + vxlan->cfg.age_interval * HZ;
if (time_before_eq(timeout, jiffies)) {
netdev_dbg(vxlan->dev,
"garbage collect %pM\n",
f->eth_addr);
f->state = NUD_STALE;
vxlan_fdb_destroy(vxlan, f, true, true);
} else if (time_before(timeout, next_timer))
next_timer = timeout;
}
spin_unlock(&vxlan->hash_lock[h]);
}
mod_timer(&vxlan->age_timer, next_timer);
}
static void vxlan_vs_del_dev(struct vxlan_dev *vxlan)
{
struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
spin_lock(&vn->sock_lock);
hlist_del_init_rcu(&vxlan->hlist4.hlist);
#if IS_ENABLED(CONFIG_IPV6)
hlist_del_init_rcu(&vxlan->hlist6.hlist);
#endif
spin_unlock(&vn->sock_lock);
}
static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan,
struct vxlan_dev_node *node)
{
struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
__be32 vni = vxlan->default_dst.remote_vni;
node->vxlan = vxlan;
spin_lock(&vn->sock_lock);
hlist_add_head_rcu(&node->hlist, vni_head(vs, vni));
spin_unlock(&vn->sock_lock);
}
/* Setup stats when device is created */
static int vxlan_init(struct net_device *dev)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
int err;
dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
if (!dev->tstats)
return -ENOMEM;
err = gro_cells_init(&vxlan->gro_cells, dev);
if (err) {
free_percpu(dev->tstats);
return err;
}
return 0;
}
static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan, __be32 vni)
{
struct vxlan_fdb *f;
u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, vni);
spin_lock_bh(&vxlan->hash_lock[hash_index]);
f = __vxlan_find_mac(vxlan, all_zeros_mac, vni);
if (f)
vxlan_fdb_destroy(vxlan, f, true, true);
spin_unlock_bh(&vxlan->hash_lock[hash_index]);
}
static void vxlan_uninit(struct net_device *dev)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
gro_cells_destroy(&vxlan->gro_cells);
vxlan_fdb_delete_default(vxlan, vxlan->cfg.vni);
free_percpu(dev->tstats);
}
/* Start ageing timer and join group when device is brought up */
static int vxlan_open(struct net_device *dev)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
int ret;
ret = vxlan_sock_add(vxlan);
if (ret < 0)
return ret;
if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
ret = vxlan_igmp_join(vxlan);
if (ret == -EADDRINUSE)
ret = 0;
if (ret) {
vxlan_sock_release(vxlan);
return ret;
}
}
if (vxlan->cfg.age_interval)
mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
return ret;
}
/* Purge the forwarding table */
static void vxlan_flush(struct vxlan_dev *vxlan, bool do_all)
{
unsigned int h;
for (h = 0; h < FDB_HASH_SIZE; ++h) {
struct hlist_node *p, *n;
spin_lock_bh(&vxlan->hash_lock[h]);
hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
struct vxlan_fdb *f
= container_of(p, struct vxlan_fdb, hlist);
if (!do_all && (f->state & (NUD_PERMANENT | NUD_NOARP)))
continue;
/* the all_zeros_mac entry is deleted at vxlan_uninit */
if (is_zero_ether_addr(f->eth_addr) &&
f->vni == vxlan->cfg.vni)
continue;
vxlan_fdb_destroy(vxlan, f, true, true);
}
spin_unlock_bh(&vxlan->hash_lock[h]);
}
}
/* Cleanup timer and forwarding table on shutdown */
static int vxlan_stop(struct net_device *dev)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
int ret = 0;
if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
!vxlan_group_used(vn, vxlan))
ret = vxlan_igmp_leave(vxlan);
del_timer_sync(&vxlan->age_timer);
vxlan_flush(vxlan, false);
vxlan_sock_release(vxlan);
return ret;
}
/* Stub, nothing needs to be done. */
static void vxlan_set_multicast_list(struct net_device *dev)
{
}
static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
struct vxlan_rdst *dst = &vxlan->default_dst;
struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
dst->remote_ifindex);
bool use_ipv6 = !!(vxlan->cfg.flags & VXLAN_F_IPV6);
/* This check is different than dev->max_mtu, because it looks at
* the lowerdev->mtu, rather than the static dev->max_mtu
*/
if (lowerdev) {
int max_mtu = lowerdev->mtu -
(use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
if (new_mtu > max_mtu)
return -EINVAL;
}
dev->mtu = new_mtu;
return 0;
}
static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
struct ip_tunnel_info *info = skb_tunnel_info(skb);
__be16 sport, dport;
sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
vxlan->cfg.port_max, true);
dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
if (ip_tunnel_info_af(info) == AF_INET) {
struct vxlan_sock *sock4 = rcu_dereference(vxlan->vn4_sock);
struct rtable *rt;
rt = vxlan_get_route(vxlan, dev, sock4, skb, 0, info->key.tos,
info->key.u.ipv4.dst,
&info->key.u.ipv4.src, dport, sport,
&info->dst_cache, info);
if (IS_ERR(rt))
return PTR_ERR(rt);
ip_rt_put(rt);
} else {
#if IS_ENABLED(CONFIG_IPV6)
struct vxlan_sock *sock6 = rcu_dereference(vxlan->vn6_sock);
struct dst_entry *ndst;
ndst = vxlan6_get_route(vxlan, dev, sock6, skb, 0, info->key.tos,
info->key.label, &info->key.u.ipv6.dst,
&info->key.u.ipv6.src, dport, sport,
&info->dst_cache, info);
if (IS_ERR(ndst))
return PTR_ERR(ndst);
dst_release(ndst);
#else /* !CONFIG_IPV6 */
return -EPFNOSUPPORT;
#endif
}
info->key.tp_src = sport;
info->key.tp_dst = dport;
return 0;
}
static const struct net_device_ops vxlan_netdev_ether_ops = {
.ndo_init = vxlan_init,
.ndo_uninit = vxlan_uninit,
.ndo_open = vxlan_open,
.ndo_stop = vxlan_stop,
.ndo_start_xmit = vxlan_xmit,
.ndo_get_stats64 = ip_tunnel_get_stats64,
.ndo_set_rx_mode = vxlan_set_multicast_list,
.ndo_change_mtu = vxlan_change_mtu,
.ndo_validate_addr = eth_validate_addr,
.ndo_set_mac_address = eth_mac_addr,
.ndo_fdb_add = vxlan_fdb_add,
.ndo_fdb_del = vxlan_fdb_delete,
.ndo_fdb_dump = vxlan_fdb_dump,
.ndo_fdb_get = vxlan_fdb_get,
.ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
.ndo_change_proto_down = dev_change_proto_down_generic,
};
static const struct net_device_ops vxlan_netdev_raw_ops = {
.ndo_init = vxlan_init,
.ndo_uninit = vxlan_uninit,
.ndo_open = vxlan_open,
.ndo_stop = vxlan_stop,
.ndo_start_xmit = vxlan_xmit,
.ndo_get_stats64 = ip_tunnel_get_stats64,
.ndo_change_mtu = vxlan_change_mtu,
.ndo_fill_metadata_dst = vxlan_fill_metadata_dst,
};
/* Info for udev, that this is a virtual tunnel endpoint */
static struct device_type vxlan_type = {
.name = "vxlan",
};
/* Calls the ndo_udp_tunnel_add of the caller in order to
* supply the listening VXLAN udp ports. Callers are expected
* to implement the ndo_udp_tunnel_add.
*/
static void vxlan_offload_rx_ports(struct net_device *dev, bool push)
{
struct vxlan_sock *vs;
struct net *net = dev_net(dev);
struct vxlan_net *vn = net_generic(net, vxlan_net_id);
unsigned int i;
spin_lock(&vn->sock_lock);
for (i = 0; i < PORT_HASH_SIZE; ++i) {
hlist_for_each_entry_rcu(vs, &vn->sock_list[i], hlist) {
unsigned short type;
if (vs->flags & VXLAN_F_GPE)
type = UDP_TUNNEL_TYPE_VXLAN_GPE;
else
type = UDP_TUNNEL_TYPE_VXLAN;
if (push)
udp_tunnel_push_rx_port(dev, vs->sock, type);
else
udp_tunnel_drop_rx_port(dev, vs->sock, type);
}
}
spin_unlock(&vn->sock_lock);
}
/* Initialize the device structure. */
static void vxlan_setup(struct net_device *dev)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
unsigned int h;
eth_hw_addr_random(dev);
ether_setup(dev);
dev->needs_free_netdev = true;
SET_NETDEV_DEVTYPE(dev, &vxlan_type);
dev->features |= NETIF_F_LLTX;
dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
dev->features |= NETIF_F_RXCSUM;
dev->features |= NETIF_F_GSO_SOFTWARE;
dev->vlan_features = dev->features;
dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
dev->hw_features |= NETIF_F_GSO_SOFTWARE;
netif_keep_dst(dev);
dev->priv_flags |= IFF_NO_QUEUE;
/* MTU range: 68 - 65535 */
dev->min_mtu = ETH_MIN_MTU;
dev->max_mtu = ETH_MAX_MTU;
INIT_LIST_HEAD(&vxlan->next);
timer_setup(&vxlan->age_timer, vxlan_cleanup, TIMER_DEFERRABLE);
vxlan->dev = dev;
for (h = 0; h < FDB_HASH_SIZE; ++h) {
spin_lock_init(&vxlan->hash_lock[h]);
INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
}
}
static void vxlan_ether_setup(struct net_device *dev)
{
dev->priv_flags &= ~IFF_TX_SKB_SHARING;
dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
dev->netdev_ops = &vxlan_netdev_ether_ops;
}
static void vxlan_raw_setup(struct net_device *dev)
{
dev->header_ops = NULL;
dev->type = ARPHRD_NONE;
dev->hard_header_len = 0;
dev->addr_len = 0;
dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
dev->netdev_ops = &vxlan_netdev_raw_ops;
}
static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
[IFLA_VXLAN_ID] = { .type = NLA_U32 },
[IFLA_VXLAN_GROUP] = { .len = sizeof_field(struct iphdr, daddr) },
[IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
[IFLA_VXLAN_LINK] = { .type = NLA_U32 },
[IFLA_VXLAN_LOCAL] = { .len = sizeof_field(struct iphdr, saddr) },
[IFLA_VXLAN_LOCAL6] = { .len = sizeof(struct in6_addr) },
[IFLA_VXLAN_TOS] = { .type = NLA_U8 },
[IFLA_VXLAN_TTL] = { .type = NLA_U8 },
[IFLA_VXLAN_LABEL] = { .type = NLA_U32 },
[IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
[IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
[IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
[IFLA_VXLAN_PORT_RANGE] = { .len = sizeof(struct ifla_vxlan_port_range) },
[IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
[IFLA_VXLAN_RSC] = { .type = NLA_U8 },
[IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
[IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
[IFLA_VXLAN_COLLECT_METADATA] = { .type = NLA_U8 },
[IFLA_VXLAN_PORT] = { .type = NLA_U16 },
[IFLA_VXLAN_UDP_CSUM] = { .type = NLA_U8 },
[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
[IFLA_VXLAN_REMCSUM_TX] = { .type = NLA_U8 },
[IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
[IFLA_VXLAN_GBP] = { .type = NLA_FLAG, },
[IFLA_VXLAN_GPE] = { .type = NLA_FLAG, },
[IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG },
[IFLA_VXLAN_TTL_INHERIT] = { .type = NLA_FLAG },
[IFLA_VXLAN_DF] = { .type = NLA_U8 },
};
static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[],
struct netlink_ext_ack *extack)
{
if (tb[IFLA_ADDRESS]) {
if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
"Provided link layer address is not Ethernet");
return -EINVAL;
}
if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
"Provided Ethernet address is not unicast");
return -EADDRNOTAVAIL;
}
}
if (tb[IFLA_MTU]) {
u32 mtu = nla_get_u32(tb[IFLA_MTU]);
if (mtu < ETH_MIN_MTU || mtu > ETH_MAX_MTU) {
NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
"MTU must be between 68 and 65535");
return -EINVAL;
}
}
if (!data) {
NL_SET_ERR_MSG(extack,
"Required attributes not provided to perform the operation");
return -EINVAL;
}
if (data[IFLA_VXLAN_ID]) {
u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
if (id >= VXLAN_N_VID) {
NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_ID],
"VXLAN ID must be lower than 16777216");
return -ERANGE;
}
}
if (data[IFLA_VXLAN_PORT_RANGE]) {
const struct ifla_vxlan_port_range *p
= nla_data(data[IFLA_VXLAN_PORT_RANGE]);
if (ntohs(p->high) < ntohs(p->low)) {
NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_PORT_RANGE],
"Invalid source port range");
return -EINVAL;
}
}
if (data[IFLA_VXLAN_DF]) {
enum ifla_vxlan_df df = nla_get_u8(data[IFLA_VXLAN_DF]);
if (df < 0 || df > VXLAN_DF_MAX) {
NL_SET_ERR_MSG_ATTR(extack, data[IFLA_VXLAN_DF],
"Invalid DF attribute");
return -EINVAL;
}
}
return 0;
}
static void vxlan_get_drvinfo(struct net_device *netdev,
struct ethtool_drvinfo *drvinfo)
{
strlcpy(drvinfo->version, VXLAN_VERSION, sizeof(drvinfo->version));
strlcpy(drvinfo->driver, "vxlan", sizeof(drvinfo->driver));
}
static int vxlan_get_link_ksettings(struct net_device *dev,
struct ethtool_link_ksettings *cmd)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
struct vxlan_rdst *dst = &vxlan->default_dst;
struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
dst->remote_ifindex);
if (!lowerdev) {
cmd->base.duplex = DUPLEX_UNKNOWN;
cmd->base.port = PORT_OTHER;
cmd->base.speed = SPEED_UNKNOWN;
return 0;
}
return __ethtool_get_link_ksettings(lowerdev, cmd);
}
static const struct ethtool_ops vxlan_ethtool_ops = {
.get_drvinfo = vxlan_get_drvinfo,
.get_link = ethtool_op_get_link,
.get_link_ksettings = vxlan_get_link_ksettings,
};
static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
__be16 port, u32 flags, int ifindex)
{
struct socket *sock;
struct udp_port_cfg udp_conf;
int err;
memset(&udp_conf, 0, sizeof(udp_conf));
if (ipv6) {
udp_conf.family = AF_INET6;
udp_conf.use_udp6_rx_checksums =
!(flags & VXLAN_F_UDP_ZERO_CSUM6_RX);
udp_conf.ipv6_v6only = 1;
} else {
udp_conf.family = AF_INET;
}
udp_conf.local_udp_port = port;
udp_conf.bind_ifindex = ifindex;
/* Open UDP socket */
err = udp_sock_create(net, &udp_conf, &sock);
if (err < 0)
return ERR_PTR(err);
return sock;
}
/* Create new listen socket if needed */
static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6,
__be16 port, u32 flags,
int ifindex)
{
struct vxlan_net *vn = net_generic(net, vxlan_net_id);
struct vxlan_sock *vs;
struct socket *sock;
unsigned int h;
struct udp_tunnel_sock_cfg tunnel_cfg;
vs = kzalloc(sizeof(*vs), GFP_KERNEL);
if (!vs)
return ERR_PTR(-ENOMEM);
for (h = 0; h < VNI_HASH_SIZE; ++h)
INIT_HLIST_HEAD(&vs->vni_list[h]);
sock = vxlan_create_sock(net, ipv6, port, flags, ifindex);
if (IS_ERR(sock)) {
kfree(vs);
return ERR_CAST(sock);
}
vs->sock = sock;
refcount_set(&vs->refcnt, 1);
vs->flags = (flags & VXLAN_F_RCV_FLAGS);
spin_lock(&vn->sock_lock);
hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
udp_tunnel_notify_add_rx_port(sock,
(vs->flags & VXLAN_F_GPE) ?
UDP_TUNNEL_TYPE_VXLAN_GPE :
UDP_TUNNEL_TYPE_VXLAN);
spin_unlock(&vn->sock_lock);
/* Mark socket as an encapsulation socket. */
memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
tunnel_cfg.sk_user_data = vs;
tunnel_cfg.encap_type = 1;
tunnel_cfg.encap_rcv = vxlan_rcv;
tunnel_cfg.encap_err_lookup = vxlan_err_lookup;
tunnel_cfg.encap_destroy = NULL;
tunnel_cfg.gro_receive = vxlan_gro_receive;
tunnel_cfg.gro_complete = vxlan_gro_complete;
setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
return vs;
}
static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6)
{
struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
struct vxlan_sock *vs = NULL;
struct vxlan_dev_node *node;
int l3mdev_index = 0;
if (vxlan->cfg.remote_ifindex)
l3mdev_index = l3mdev_master_upper_ifindex_by_index(
vxlan->net, vxlan->cfg.remote_ifindex);
if (!vxlan->cfg.no_share) {
spin_lock(&vn->sock_lock);
vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
vxlan->cfg.dst_port, vxlan->cfg.flags,
l3mdev_index);
if (vs && !refcount_inc_not_zero(&vs->refcnt)) {
spin_unlock(&vn->sock_lock);
return -EBUSY;
}
spin_unlock(&vn->sock_lock);
}
if (!vs)
vs = vxlan_socket_create(vxlan->net, ipv6,
vxlan->cfg.dst_port, vxlan->cfg.flags,
l3mdev_index);
if (IS_ERR(vs))
return PTR_ERR(vs);
#if IS_ENABLED(CONFIG_IPV6)
if (ipv6) {
rcu_assign_pointer(vxlan->vn6_sock, vs);
node = &vxlan->hlist6;
} else
#endif
{
rcu_assign_pointer(vxlan->vn4_sock, vs);
node = &vxlan->hlist4;
}
vxlan_vs_add_dev(vs, vxlan, node);
return 0;
}
static int vxlan_sock_add(struct vxlan_dev *vxlan)
{
bool metadata = vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA;
bool ipv6 = vxlan->cfg.flags & VXLAN_F_IPV6 || metadata;
bool ipv4 = !ipv6 || metadata;
int ret = 0;
RCU_INIT_POINTER(vxlan->vn4_sock, NULL);
#if IS_ENABLED(CONFIG_IPV6)
RCU_INIT_POINTER(vxlan->vn6_sock, NULL);
if (ipv6) {
ret = __vxlan_sock_add(vxlan, true);
if (ret < 0 && ret != -EAFNOSUPPORT)
ipv4 = false;
}
#endif
if (ipv4)
ret = __vxlan_sock_add(vxlan, false);
if (ret < 0)
vxlan_sock_release(vxlan);
return ret;
}
static int vxlan_config_validate(struct net *src_net, struct vxlan_config *conf,
struct net_device **lower,
struct vxlan_dev *old,
struct netlink_ext_ack *extack)
{
struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
struct vxlan_dev *tmp;
bool use_ipv6 = false;
if (conf->flags & VXLAN_F_GPE) {
/* For now, allow GPE only together with
* COLLECT_METADATA. This can be relaxed later; in such
* case, the other side of the PtP link will have to be
* provided.
*/
if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) ||
!(conf->flags & VXLAN_F_COLLECT_METADATA)) {
NL_SET_ERR_MSG(extack,
"VXLAN GPE does not support this combination of attributes");
return -EINVAL;
}
}
if (!conf->remote_ip.sa.sa_family && !conf->saddr.sa.sa_family) {
/* Unless IPv6 is explicitly requested, assume IPv4 */
conf->remote_ip.sa.sa_family = AF_INET;
conf->saddr.sa.sa_family = AF_INET;
} else if (!conf->remote_ip.sa.sa_family) {
conf->remote_ip.sa.sa_family = conf->saddr.sa.sa_family;
} else if (!conf->saddr.sa.sa_family) {
conf->saddr.sa.sa_family = conf->remote_ip.sa.sa_family;
}
if (conf->saddr.sa.sa_family != conf->remote_ip.sa.sa_family) {
NL_SET_ERR_MSG(extack,
"Local and remote address must be from the same family");
return -EINVAL;
}
if (vxlan_addr_multicast(&conf->saddr)) {
NL_SET_ERR_MSG(extack, "Local address cannot be multicast");
return -EINVAL;
}
if (conf->saddr.sa.sa_family == AF_INET6) {
if (!IS_ENABLED(CONFIG_IPV6)) {
NL_SET_ERR_MSG(extack,
"IPv6 support not enabled in the kernel");
return -EPFNOSUPPORT;
}
use_ipv6 = true;
conf->flags |= VXLAN_F_IPV6;
if (!(conf->flags & VXLAN_F_COLLECT_METADATA)) {
int local_type =
ipv6_addr_type(&conf->saddr.sin6.sin6_addr);
int remote_type =
ipv6_addr_type(&conf->remote_ip.sin6.sin6_addr);
if (local_type & IPV6_ADDR_LINKLOCAL) {
if (!(remote_type & IPV6_ADDR_LINKLOCAL) &&
(remote_type != IPV6_ADDR_ANY)) {
NL_SET_ERR_MSG(extack,
"Invalid combination of local and remote address scopes");
return -EINVAL;
}
conf->flags |= VXLAN_F_IPV6_LINKLOCAL;
} else {
if (remote_type ==
(IPV6_ADDR_UNICAST | IPV6_ADDR_LINKLOCAL)) {
NL_SET_ERR_MSG(extack,
"Invalid combination of local and remote address scopes");
return -EINVAL;
}
conf->flags &= ~VXLAN_F_IPV6_LINKLOCAL;
}
}
}
if (conf->label && !use_ipv6) {
NL_SET_ERR_MSG(extack,
"Label attribute only applies to IPv6 VXLAN devices");
return -EINVAL;
}
if (conf->remote_ifindex) {
struct net_device *lowerdev;
lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
if (!lowerdev) {
NL_SET_ERR_MSG(extack,
"Invalid local interface, device not found");
return -ENODEV;
}
#if IS_ENABLED(CONFIG_IPV6)
if (use_ipv6) {
struct inet6_dev *idev = __in6_dev_get(lowerdev);
if (idev && idev->cnf.disable_ipv6) {
NL_SET_ERR_MSG(extack,
"IPv6 support disabled by administrator");
return -EPERM;
}
}
#endif
*lower = lowerdev;
} else {
if (vxlan_addr_multicast(&conf->remote_ip)) {
NL_SET_ERR_MSG(extack,
"Local interface required for multicast remote destination");
return -EINVAL;
}
#if IS_ENABLED(CONFIG_IPV6)
if (conf->flags & VXLAN_F_IPV6_LINKLOCAL) {
NL_SET_ERR_MSG(extack,
"Local interface required for link-local local/remote addresses");
return -EINVAL;
}
#endif
*lower = NULL;
}
if (!conf->dst_port) {
if (conf->flags & VXLAN_F_GPE)
conf->dst_port = htons(4790); /* IANA VXLAN-GPE port */
else
conf->dst_port = htons(vxlan_port);
}
if (!conf->age_interval)
conf->age_interval = FDB_AGE_DEFAULT;
list_for_each_entry(tmp, &vn->vxlan_list, next) {
if (tmp == old)
continue;
if (tmp->cfg.vni != conf->vni)
continue;
if (tmp->cfg.dst_port != conf->dst_port)
continue;
if ((tmp->cfg.flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)) !=
(conf->flags & (VXLAN_F_RCV_FLAGS | VXLAN_F_IPV6)))
continue;
if ((conf->flags & VXLAN_F_IPV6_LINKLOCAL) &&
tmp->cfg.remote_ifindex != conf->remote_ifindex)
continue;
NL_SET_ERR_MSG(extack,
"A VXLAN device with the specified VNI already exists");
return -EEXIST;
}
return 0;
}
static void vxlan_config_apply(struct net_device *dev,
struct vxlan_config *conf,
struct net_device *lowerdev,
struct net *src_net,
bool changelink)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
struct vxlan_rdst *dst = &vxlan->default_dst;
unsigned short needed_headroom = ETH_HLEN;
bool use_ipv6 = !!(conf->flags & VXLAN_F_IPV6);
int max_mtu = ETH_MAX_MTU;
if (!changelink) {
if (conf->flags & VXLAN_F_GPE)
vxlan_raw_setup(dev);
else
vxlan_ether_setup(dev);
if (conf->mtu)
dev->mtu = conf->mtu;
vxlan->net = src_net;
}
dst->remote_vni = conf->vni;
memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
if (lowerdev) {
dst->remote_ifindex = conf->remote_ifindex;
dev->gso_max_size = lowerdev->gso_max_size;
dev->gso_max_segs = lowerdev->gso_max_segs;
needed_headroom = lowerdev->hard_header_len;
max_mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM :
VXLAN_HEADROOM);
if (max_mtu < ETH_MIN_MTU)
max_mtu = ETH_MIN_MTU;
if (!changelink && !conf->mtu)
dev->mtu = max_mtu;
}
if (dev->mtu > max_mtu)
dev->mtu = max_mtu;
if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
needed_headroom += VXLAN6_HEADROOM;
else
needed_headroom += VXLAN_HEADROOM;
dev->needed_headroom = needed_headroom;
memcpy(&vxlan->cfg, conf, sizeof(*conf));
}
static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
struct vxlan_config *conf, bool changelink,
struct netlink_ext_ack *extack)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
struct net_device *lowerdev;
int ret;
ret = vxlan_config_validate(src_net, conf, &lowerdev, vxlan, extack);
if (ret)
return ret;
vxlan_config_apply(dev, conf, lowerdev, src_net, changelink);
return 0;
}
static int __vxlan_dev_create(struct net *net, struct net_device *dev,
struct vxlan_config *conf,
struct netlink_ext_ack *extack)
{
struct vxlan_net *vn = net_generic(net, vxlan_net_id);
struct vxlan_dev *vxlan = netdev_priv(dev);
struct net_device *remote_dev = NULL;
struct vxlan_fdb *f = NULL;
bool unregister = false;
struct vxlan_rdst *dst;
int err;
dst = &vxlan->default_dst;
err = vxlan_dev_configure(net, dev, conf, false, extack);
if (err)
return err;
dev->ethtool_ops = &vxlan_ethtool_ops;
/* create an fdb entry for a valid default destination */
if (!vxlan_addr_any(&dst->remote_ip)) {
err = vxlan_fdb_create(vxlan, all_zeros_mac,
&dst->remote_ip,
NUD_REACHABLE | NUD_PERMANENT,
vxlan->cfg.dst_port,
dst->remote_vni,
dst->remote_vni,
dst->remote_ifindex,
NTF_SELF, 0, &f, extack);
if (err)
return err;
}
err = register_netdevice(dev);
if (err)
goto errout;
unregister = true;
if (dst->remote_ifindex) {
remote_dev = __dev_get_by_index(net, dst->remote_ifindex);
if (!remote_dev)
goto errout;
err = netdev_upper_dev_link(remote_dev, dev, extack);
if (err)
goto errout;
}
err = rtnl_configure_link(dev, NULL);
if (err)
goto unlink;
if (f) {
vxlan_fdb_insert(vxlan, all_zeros_mac, dst->remote_vni, f);
/* notify default fdb entry */
err = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f),
RTM_NEWNEIGH, true, extack);
if (err) {
vxlan_fdb_destroy(vxlan, f, false, false);
if (remote_dev)
netdev_upper_dev_unlink(remote_dev, dev);
goto unregister;
}
}
list_add(&vxlan->next, &vn->vxlan_list);
if (remote_dev)
dst->remote_dev = remote_dev;
return 0;
unlink:
if (remote_dev)
netdev_upper_dev_unlink(remote_dev, dev);
errout:
/* unregister_netdevice() destroys the default FDB entry with deletion
* notification. But the addition notification was not sent yet, so
* destroy the entry by hand here.
*/
if (f)
__vxlan_fdb_free(f);
unregister:
if (unregister)
unregister_netdevice(dev);
return err;
}
/* Set/clear flags based on attribute */
static int vxlan_nl2flag(struct vxlan_config *conf, struct nlattr *tb[],
int attrtype, unsigned long mask, bool changelink,
bool changelink_supported,
struct netlink_ext_ack *extack)
{
unsigned long flags;
if (!tb[attrtype])
return 0;
if (changelink && !changelink_supported) {
vxlan_flag_attr_error(attrtype, extack);
return -EOPNOTSUPP;
}
if (vxlan_policy[attrtype].type == NLA_FLAG)
flags = conf->flags | mask;
else if (nla_get_u8(tb[attrtype]))
flags = conf->flags | mask;
else
flags = conf->flags & ~mask;
conf->flags = flags;
return 0;
}
static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[],
struct net_device *dev, struct vxlan_config *conf,
bool changelink, struct netlink_ext_ack *extack)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
int err = 0;
memset(conf, 0, sizeof(*conf));
/* if changelink operation, start with old existing cfg */
if (changelink)
memcpy(conf, &vxlan->cfg, sizeof(*conf));
if (data[IFLA_VXLAN_ID]) {
__be32 vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
if (changelink && (vni != conf->vni)) {
NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_ID], "Cannot change VNI");
return -EOPNOTSUPP;
}
conf->vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
}
if (data[IFLA_VXLAN_GROUP]) {
if (changelink && (conf->remote_ip.sa.sa_family != AF_INET)) {
NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP], "New group address family does not match old group");
return -EOPNOTSUPP;
}
conf->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
conf->remote_ip.sa.sa_family = AF_INET;
} else if (data[IFLA_VXLAN_GROUP6]) {
if (!IS_ENABLED(CONFIG_IPV6)) {
NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "IPv6 support not enabled in the kernel");
return -EPFNOSUPPORT;
}
if (changelink && (conf->remote_ip.sa.sa_family != AF_INET6)) {
NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "New group address family does not match old group");
return -EOPNOTSUPP;
}
conf->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
conf->remote_ip.sa.sa_family = AF_INET6;
}
if (data[IFLA_VXLAN_LOCAL]) {
if (changelink && (conf->saddr.sa.sa_family != AF_INET)) {
NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL], "New local address family does not match old");
return -EOPNOTSUPP;
}
conf->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
conf->saddr.sa.sa_family = AF_INET;
} else if (data[IFLA_VXLAN_LOCAL6]) {
if (!IS_ENABLED(CONFIG_IPV6)) {
NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "IPv6 support not enabled in the kernel");
return -EPFNOSUPPORT;
}
if (changelink && (conf->saddr.sa.sa_family != AF_INET6)) {
NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "New local address family does not match old");
return -EOPNOTSUPP;
}
/* TODO: respect scope id */
conf->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
conf->saddr.sa.sa_family = AF_INET6;
}
if (data[IFLA_VXLAN_LINK])
conf->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
if (data[IFLA_VXLAN_TOS])
conf->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
if (data[IFLA_VXLAN_TTL])
conf->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
if (data[IFLA_VXLAN_TTL_INHERIT]) {
err = vxlan_nl2flag(conf, data, IFLA_VXLAN_TTL_INHERIT,
VXLAN_F_TTL_INHERIT, changelink, false,
extack);
if (err)
return err;
}
if (data[IFLA_VXLAN_LABEL])
conf->label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
IPV6_FLOWLABEL_MASK;
if (data[IFLA_VXLAN_LEARNING]) {
err = vxlan_nl2flag(conf, data, IFLA_VXLAN_LEARNING,
VXLAN_F_LEARN, changelink, true,
extack);
if (err)
return err;
} else if (!changelink) {
/* default to learn on a new device */
conf->flags |= VXLAN_F_LEARN;
}
if (data[IFLA_VXLAN_AGEING])
conf->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
if (data[IFLA_VXLAN_PROXY]) {
err = vxlan_nl2flag(conf, data, IFLA_VXLAN_PROXY,
VXLAN_F_PROXY, changelink, false,
extack);
if (err)
return err;
}
if (data[IFLA_VXLAN_RSC]) {
err = vxlan_nl2flag(conf, data, IFLA_VXLAN_RSC,
VXLAN_F_RSC, changelink, false,
extack);
if (err)
return err;
}
if (data[IFLA_VXLAN_L2MISS]) {
err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L2MISS,
VXLAN_F_L2MISS, changelink, false,
extack);
if (err)
return err;
}
if (data[IFLA_VXLAN_L3MISS]) {
err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L3MISS,
VXLAN_F_L3MISS, changelink, false,
extack);
if (err)
return err;
}
if (data[IFLA_VXLAN_LIMIT]) {
if (changelink) {
NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LIMIT],
"Cannot change limit");
return -EOPNOTSUPP;
}
conf->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
}
if (data[IFLA_VXLAN_COLLECT_METADATA]) {
err = vxlan_nl2flag(conf, data, IFLA_VXLAN_COLLECT_METADATA,
VXLAN_F_COLLECT_METADATA, changelink, false,
extack);
if (err)
return err;
}
if (data[IFLA_VXLAN_PORT_RANGE]) {
if (!changelink) {
const struct ifla_vxlan_port_range *p
= nla_data(data[IFLA_VXLAN_PORT_RANGE]);
conf->port_min = ntohs(p->low);
conf->port_max = ntohs(p->high);
} else {
NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT_RANGE],
"Cannot change port range");
return -EOPNOTSUPP;
}
}
if (data[IFLA_VXLAN_PORT]) {
if (changelink) {
NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT],
"Cannot change port");
return -EOPNOTSUPP;
}
conf->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
}
if (data[IFLA_VXLAN_UDP_CSUM]) {
if (changelink) {
NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_UDP_CSUM],
"Cannot change UDP_CSUM flag");
return -EOPNOTSUPP;
}
if (!nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
conf->flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
}
if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) {
err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
VXLAN_F_UDP_ZERO_CSUM6_TX, changelink,
false, extack);
if (err)
return err;
}
if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) {
err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
VXLAN_F_UDP_ZERO_CSUM6_RX, changelink,
false, extack);
if (err)
return err;
}
if (data[IFLA_VXLAN_REMCSUM_TX]) {
err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_TX,
VXLAN_F_REMCSUM_TX, changelink, false,
extack);
if (err)
return err;
}
if (data[IFLA_VXLAN_REMCSUM_RX]) {
err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_RX,
VXLAN_F_REMCSUM_RX, changelink, false,
extack);
if (err)
return err;
}
if (data[IFLA_VXLAN_GBP]) {
err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GBP,
VXLAN_F_GBP, changelink, false, extack);
if (err)
return err;
}
if (data[IFLA_VXLAN_GPE]) {
err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GPE,
VXLAN_F_GPE, changelink, false,
extack);
if (err)
return err;
}
if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL]) {
err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_NOPARTIAL,
VXLAN_F_REMCSUM_NOPARTIAL, changelink,
false, extack);
if (err)
return err;
}
if (tb[IFLA_MTU]) {
if (changelink) {
NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
"Cannot change mtu");
return -EOPNOTSUPP;
}
conf->mtu = nla_get_u32(tb[IFLA_MTU]);
}
if (data[IFLA_VXLAN_DF])
conf->df = nla_get_u8(data[IFLA_VXLAN_DF]);
return 0;
}
static int vxlan_newlink(struct net *src_net, struct net_device *dev,
struct nlattr *tb[], struct nlattr *data[],
struct netlink_ext_ack *extack)
{
struct vxlan_config conf;
int err;
err = vxlan_nl2conf(tb, data, dev, &conf, false, extack);
if (err)
return err;
return __vxlan_dev_create(src_net, dev, &conf, extack);
}
static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
struct nlattr *data[],
struct netlink_ext_ack *extack)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
struct net_device *lowerdev;
struct vxlan_config conf;
struct vxlan_rdst *dst;
int err;
dst = &vxlan->default_dst;
err = vxlan_nl2conf(tb, data, dev, &conf, true, extack);
if (err)
return err;
err = vxlan_config_validate(vxlan->net, &conf, &lowerdev,
vxlan, extack);
if (err)
return err;
if (dst->remote_dev == lowerdev)
lowerdev = NULL;
err = netdev_adjacent_change_prepare(dst->remote_dev, lowerdev, dev,
extack);
if (err)
return err;
/* handle default dst entry */
if (!vxlan_addr_equal(&conf.remote_ip, &dst->remote_ip)) {
u32 hash_index = fdb_head_index(vxlan, all_zeros_mac, conf.vni);
spin_lock_bh(&vxlan->hash_lock[hash_index]);
if (!vxlan_addr_any(&conf.remote_ip)) {
err = vxlan_fdb_update(vxlan, all_zeros_mac,
&conf.remote_ip,
NUD_REACHABLE | NUD_PERMANENT,
NLM_F_APPEND | NLM_F_CREATE,
vxlan->cfg.dst_port,
conf.vni, conf.vni,
conf.remote_ifindex,
NTF_SELF, 0, true, extack);
if (err) {
spin_unlock_bh(&vxlan->hash_lock[hash_index]);
netdev_adjacent_change_abort(dst->remote_dev,
lowerdev, dev);
return err;
}
}
if (!vxlan_addr_any(&dst->remote_ip))
__vxlan_fdb_delete(vxlan, all_zeros_mac,
dst->remote_ip,
vxlan->cfg.dst_port,
dst->remote_vni,
dst->remote_vni,
dst->remote_ifindex,
true);
spin_unlock_bh(&vxlan->hash_lock[hash_index]);
}
if (conf.age_interval != vxlan->cfg.age_interval)
mod_timer(&vxlan->age_timer, jiffies);
netdev_adjacent_change_commit(dst->remote_dev, lowerdev, dev);
if (lowerdev && lowerdev != dst->remote_dev)
dst->remote_dev = lowerdev;
vxlan_config_apply(dev, &conf, lowerdev, vxlan->net, true);
return 0;
}
static void vxlan_dellink(struct net_device *dev, struct list_head *head)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
vxlan_flush(vxlan, true);
list_del(&vxlan->next);
unregister_netdevice_queue(dev, head);
if (vxlan->default_dst.remote_dev)
netdev_upper_dev_unlink(vxlan->default_dst.remote_dev, dev);
}
static size_t vxlan_get_size(const struct net_device *dev)
{
return nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_ID */
nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_GROUP{6} */
nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LINK */
nla_total_size(sizeof(struct in6_addr)) + /* IFLA_VXLAN_LOCAL{6} */
nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL */
nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TTL_INHERIT */
nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_TOS */
nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_DF */
nla_total_size(sizeof(__be32)) + /* IFLA_VXLAN_LABEL */
nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_LEARNING */
nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_PROXY */
nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_RSC */
nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L2MISS */
nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_L3MISS */
nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */
nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
0;
}
static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
{
const struct vxlan_dev *vxlan = netdev_priv(dev);
const struct vxlan_rdst *dst = &vxlan->default_dst;
struct ifla_vxlan_port_range ports = {
.low = htons(vxlan->cfg.port_min),
.high = htons(vxlan->cfg.port_max),
};
if (nla_put_u32(skb, IFLA_VXLAN_ID, be32_to_cpu(dst->remote_vni)))
goto nla_put_failure;
if (!vxlan_addr_any(&dst->remote_ip)) {
if (dst->remote_ip.sa.sa_family == AF_INET) {
if (nla_put_in_addr(skb, IFLA_VXLAN_GROUP,
dst->remote_ip.sin.sin_addr.s_addr))
goto nla_put_failure;
#if IS_ENABLED(CONFIG_IPV6)
} else {
if (nla_put_in6_addr(skb, IFLA_VXLAN_GROUP6,
&dst->remote_ip.sin6.sin6_addr))
goto nla_put_failure;
#endif
}
}
if (dst->remote_ifindex && nla_put_u32(skb, IFLA_VXLAN_LINK, dst->remote_ifindex))
goto nla_put_failure;
if (!vxlan_addr_any(&vxlan->cfg.saddr)) {
if (vxlan->cfg.saddr.sa.sa_family == AF_INET) {
if (nla_put_in_addr(skb, IFLA_VXLAN_LOCAL,
vxlan->cfg.saddr.sin.sin_addr.s_addr))
goto nla_put_failure;
#if IS_ENABLED(CONFIG_IPV6)
} else {
if (nla_put_in6_addr(skb, IFLA_VXLAN_LOCAL6,
&vxlan->cfg.saddr.sin6.sin6_addr))
goto nla_put_failure;
#endif
}
}
if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->cfg.ttl) ||
nla_put_u8(skb, IFLA_VXLAN_TTL_INHERIT,
!!(vxlan->cfg.flags & VXLAN_F_TTL_INHERIT)) ||
nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->cfg.tos) ||
nla_put_u8(skb, IFLA_VXLAN_DF, vxlan->cfg.df) ||
nla_put_be32(skb, IFLA_VXLAN_LABEL, vxlan->cfg.label) ||
nla_put_u8(skb, IFLA_VXLAN_LEARNING,
!!(vxlan->cfg.flags & VXLAN_F_LEARN)) ||
nla_put_u8(skb, IFLA_VXLAN_PROXY,
!!(vxlan->cfg.flags & VXLAN_F_PROXY)) ||
nla_put_u8(skb, IFLA_VXLAN_RSC,
!!(vxlan->cfg.flags & VXLAN_F_RSC)) ||
nla_put_u8(skb, IFLA_VXLAN_L2MISS,
!!(vxlan->cfg.flags & VXLAN_F_L2MISS)) ||
nla_put_u8(skb, IFLA_VXLAN_L3MISS,
!!(vxlan->cfg.flags & VXLAN_F_L3MISS)) ||
nla_put_u8(skb, IFLA_VXLAN_COLLECT_METADATA,
!!(vxlan->cfg.flags & VXLAN_F_COLLECT_METADATA)) ||
nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->cfg.age_interval) ||
nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->cfg.addrmax) ||
nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port) ||
nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM_TX)) ||
nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
!!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
!!(vxlan->cfg.flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
!!(vxlan->cfg.flags & VXLAN_F_REMCSUM_TX)) ||
nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
!!(vxlan->cfg.flags & VXLAN_F_REMCSUM_RX)))
goto nla_put_failure;
if (nla_put(skb, IFLA_VXLAN_PORT_RANGE, sizeof(ports), &ports))
goto nla_put_failure;
if (vxlan->cfg.flags & VXLAN_F_GBP &&
nla_put_flag(skb, IFLA_VXLAN_GBP))
goto nla_put_failure;
if (vxlan->cfg.flags & VXLAN_F_GPE &&
nla_put_flag(skb, IFLA_VXLAN_GPE))
goto nla_put_failure;
if (vxlan->cfg.flags & VXLAN_F_REMCSUM_NOPARTIAL &&
nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
goto nla_put_failure;
return 0;
nla_put_failure:
return -EMSGSIZE;
}
static struct net *vxlan_get_link_net(const struct net_device *dev)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
return vxlan->net;
}
static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
.kind = "vxlan",
.maxtype = IFLA_VXLAN_MAX,
.policy = vxlan_policy,
.priv_size = sizeof(struct vxlan_dev),
.setup = vxlan_setup,
.validate = vxlan_validate,
.newlink = vxlan_newlink,
.changelink = vxlan_changelink,
.dellink = vxlan_dellink,
.get_size = vxlan_get_size,
.fill_info = vxlan_fill_info,
.get_link_net = vxlan_get_link_net,
};
struct net_device *vxlan_dev_create(struct net *net, const char *name,
u8 name_assign_type,
struct vxlan_config *conf)
{
struct nlattr *tb[IFLA_MAX + 1];
struct net_device *dev;
int err;
memset(&tb, 0, sizeof(tb));
dev = rtnl_create_link(net, name, name_assign_type,
&vxlan_link_ops, tb, NULL);
if (IS_ERR(dev))
return dev;
err = __vxlan_dev_create(net, dev, conf, NULL);
if (err < 0) {
free_netdev(dev);
return ERR_PTR(err);
}
err = rtnl_configure_link(dev, NULL);
if (err < 0) {
LIST_HEAD(list_kill);
vxlan_dellink(dev, &list_kill);
unregister_netdevice_many(&list_kill);
return ERR_PTR(err);
}
return dev;
}
EXPORT_SYMBOL_GPL(vxlan_dev_create);
static void vxlan_handle_lowerdev_unregister(struct vxlan_net *vn,
struct net_device *dev)
{
struct vxlan_dev *vxlan, *next;
LIST_HEAD(list_kill);
list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
struct vxlan_rdst *dst = &vxlan->default_dst;
/* In case we created vxlan device with carrier
* and we loose the carrier due to module unload
* we also need to remove vxlan device. In other
* cases, it's not necessary and remote_ifindex
* is 0 here, so no matches.
*/
if (dst->remote_ifindex == dev->ifindex)
vxlan_dellink(vxlan->dev, &list_kill);
}
unregister_netdevice_many(&list_kill);
}
static int vxlan_netdevice_event(struct notifier_block *unused,
unsigned long event, void *ptr)
{
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
if (event == NETDEV_UNREGISTER) {
if (!dev->udp_tunnel_nic_info)
vxlan_offload_rx_ports(dev, false);
vxlan_handle_lowerdev_unregister(vn, dev);
} else if (event == NETDEV_REGISTER) {
if (!dev->udp_tunnel_nic_info)
vxlan_offload_rx_ports(dev, true);
} else if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
event == NETDEV_UDP_TUNNEL_DROP_INFO) {
vxlan_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
}
return NOTIFY_DONE;
}
static struct notifier_block vxlan_notifier_block __read_mostly = {
.notifier_call = vxlan_netdevice_event,
};
static void
vxlan_fdb_offloaded_set(struct net_device *dev,
struct switchdev_notifier_vxlan_fdb_info *fdb_info)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
struct vxlan_rdst *rdst;
struct vxlan_fdb *f;
u32 hash_index;
hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
spin_lock_bh(&vxlan->hash_lock[hash_index]);
f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
if (!f)
goto out;
rdst = vxlan_fdb_find_rdst(f, &fdb_info->remote_ip,
fdb_info->remote_port,
fdb_info->remote_vni,
fdb_info->remote_ifindex);
if (!rdst)
goto out;
rdst->offloaded = fdb_info->offloaded;
out:
spin_unlock_bh(&vxlan->hash_lock[hash_index]);
}
static int
vxlan_fdb_external_learn_add(struct net_device *dev,
struct switchdev_notifier_vxlan_fdb_info *fdb_info)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
struct netlink_ext_ack *extack;
u32 hash_index;
int err;
hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
extack = switchdev_notifier_info_to_extack(&fdb_info->info);
spin_lock_bh(&vxlan->hash_lock[hash_index]);
err = vxlan_fdb_update(vxlan, fdb_info->eth_addr, &fdb_info->remote_ip,
NUD_REACHABLE,
NLM_F_CREATE | NLM_F_REPLACE,
fdb_info->remote_port,
fdb_info->vni,
fdb_info->remote_vni,
fdb_info->remote_ifindex,
NTF_USE | NTF_SELF | NTF_EXT_LEARNED,
0, false, extack);
spin_unlock_bh(&vxlan->hash_lock[hash_index]);
return err;
}
static int
vxlan_fdb_external_learn_del(struct net_device *dev,
struct switchdev_notifier_vxlan_fdb_info *fdb_info)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
struct vxlan_fdb *f;
u32 hash_index;
int err = 0;
hash_index = fdb_head_index(vxlan, fdb_info->eth_addr, fdb_info->vni);
spin_lock_bh(&vxlan->hash_lock[hash_index]);
f = vxlan_find_mac(vxlan, fdb_info->eth_addr, fdb_info->vni);
if (!f)
err = -ENOENT;
else if (f->flags & NTF_EXT_LEARNED)
err = __vxlan_fdb_delete(vxlan, fdb_info->eth_addr,
fdb_info->remote_ip,
fdb_info->remote_port,
fdb_info->vni,
fdb_info->remote_vni,
fdb_info->remote_ifindex,
false);
spin_unlock_bh(&vxlan->hash_lock[hash_index]);
return err;
}
static int vxlan_switchdev_event(struct notifier_block *unused,
unsigned long event, void *ptr)
{
struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
struct switchdev_notifier_vxlan_fdb_info *fdb_info;
int err = 0;
switch (event) {
case SWITCHDEV_VXLAN_FDB_OFFLOADED:
vxlan_fdb_offloaded_set(dev, ptr);
break;
case SWITCHDEV_VXLAN_FDB_ADD_TO_BRIDGE:
fdb_info = ptr;
err = vxlan_fdb_external_learn_add(dev, fdb_info);
if (err) {
err = notifier_from_errno(err);
break;
}
fdb_info->offloaded = true;
vxlan_fdb_offloaded_set(dev, fdb_info);
break;
case SWITCHDEV_VXLAN_FDB_DEL_TO_BRIDGE:
fdb_info = ptr;
err = vxlan_fdb_external_learn_del(dev, fdb_info);
if (err) {
err = notifier_from_errno(err);
break;
}
fdb_info->offloaded = false;
vxlan_fdb_offloaded_set(dev, fdb_info);
break;
}
return err;
}
static struct notifier_block vxlan_switchdev_notifier_block __read_mostly = {
.notifier_call = vxlan_switchdev_event,
};
static void vxlan_fdb_nh_flush(struct nexthop *nh)
{
struct vxlan_fdb *fdb;
struct vxlan_dev *vxlan;
u32 hash_index;
rcu_read_lock();
list_for_each_entry_rcu(fdb, &nh->fdb_list, nh_list) {
vxlan = rcu_dereference(fdb->vdev);
WARN_ON(!vxlan);
hash_index = fdb_head_index(vxlan, fdb->eth_addr,
vxlan->default_dst.remote_vni);
spin_lock_bh(&vxlan->hash_lock[hash_index]);
if (!hlist_unhashed(&fdb->hlist))
vxlan_fdb_destroy(vxlan, fdb, false, false);
spin_unlock_bh(&vxlan->hash_lock[hash_index]);
}
rcu_read_unlock();
}
static int vxlan_nexthop_event(struct notifier_block *nb,
unsigned long event, void *ptr)
{
struct nexthop *nh = ptr;
if (!nh || event != NEXTHOP_EVENT_DEL)
return NOTIFY_DONE;
vxlan_fdb_nh_flush(nh);
return NOTIFY_DONE;
}
static struct notifier_block vxlan_nexthop_notifier_block __read_mostly = {
.notifier_call = vxlan_nexthop_event,
};
static __net_init int vxlan_init_net(struct net *net)
{
struct vxlan_net *vn = net_generic(net, vxlan_net_id);
unsigned int h;
INIT_LIST_HEAD(&vn->vxlan_list);
spin_lock_init(&vn->sock_lock);
for (h = 0; h < PORT_HASH_SIZE; ++h)
INIT_HLIST_HEAD(&vn->sock_list[h]);
return register_nexthop_notifier(net, &vxlan_nexthop_notifier_block);
}
static void vxlan_destroy_tunnels(struct net *net, struct list_head *head)
{
struct vxlan_net *vn = net_generic(net, vxlan_net_id);
struct vxlan_dev *vxlan, *next;
struct net_device *dev, *aux;
unsigned int h;
for_each_netdev_safe(net, dev, aux)
if (dev->rtnl_link_ops == &vxlan_link_ops)
unregister_netdevice_queue(dev, head);
list_for_each_entry_safe(vxlan, next, &vn->vxlan_list, next) {
/* If vxlan->dev is in the same netns, it has already been added
* to the list by the previous loop.
*/
if (!net_eq(dev_net(vxlan->dev), net))
unregister_netdevice_queue(vxlan->dev, head);
}
for (h = 0; h < PORT_HASH_SIZE; ++h)
WARN_ON_ONCE(!hlist_empty(&vn->sock_list[h]));
}
static void __net_exit vxlan_exit_batch_net(struct list_head *net_list)
{
struct net *net;
LIST_HEAD(list);
rtnl_lock();
list_for_each_entry(net, net_list, exit_list)
unregister_nexthop_notifier(net, &vxlan_nexthop_notifier_block);
list_for_each_entry(net, net_list, exit_list)
vxlan_destroy_tunnels(net, &list);
unregister_netdevice_many(&list);
rtnl_unlock();
}
static struct pernet_operations vxlan_net_ops = {
.init = vxlan_init_net,
.exit_batch = vxlan_exit_batch_net,
.id = &vxlan_net_id,
.size = sizeof(struct vxlan_net),
};
static int __init vxlan_init_module(void)
{
int rc;
get_random_bytes(&vxlan_salt, sizeof(vxlan_salt));
rc = register_pernet_subsys(&vxlan_net_ops);
if (rc)
goto out1;
rc = register_netdevice_notifier(&vxlan_notifier_block);
if (rc)
goto out2;
rc = register_switchdev_notifier(&vxlan_switchdev_notifier_block);
if (rc)
goto out3;
rc = rtnl_link_register(&vxlan_link_ops);
if (rc)
goto out4;
return 0;
out4:
unregister_switchdev_notifier(&vxlan_switchdev_notifier_block);
out3:
unregister_netdevice_notifier(&vxlan_notifier_block);
out2:
unregister_pernet_subsys(&vxlan_net_ops);
out1:
return rc;
}
late_initcall(vxlan_init_module);
static void __exit vxlan_cleanup_module(void)
{
rtnl_link_unregister(&vxlan_link_ops);
unregister_switchdev_notifier(&vxlan_switchdev_notifier_block);
unregister_netdevice_notifier(&vxlan_notifier_block);
unregister_pernet_subsys(&vxlan_net_ops);
/* rcu_barrier() is called by netns */
}
module_exit(vxlan_cleanup_module);
MODULE_LICENSE("GPL");
MODULE_VERSION(VXLAN_VERSION);
MODULE_AUTHOR("Stephen Hemminger <stephen@networkplumber.org>");
MODULE_DESCRIPTION("Driver for VXLAN encapsulated traffic");
MODULE_ALIAS_RTNL_LINK("vxlan");
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