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linux/drivers/net/vxlan.c
Alexey Kodanev 40fb70f3aa vxlan: fix wrong usage of VXLAN_VID_MASK 
commit dfd8645ea1 wrongly assumes that VXLAN_VDI_MASK includes
eight lower order reserved bits of VNI field that are using for remote
checksum offload.

Right now, when VNI number greater then 0xffff, vxlan_udp_encap_recv()
will always return with 'bad_flag' error, reducing the usable vni range
from 0..16777215 to 0..65535. Also, it doesn't really check whether RCO
bits processed or not.

Fix it by adding new VNI mask which has all 32 bits of VNI field:
24 bits for id and 8 bits for other usage.

Signed-off-by: Alexey Kodanev <alexey.kodanev@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2015-03-13 13:08:07 -04:00

3082 lines
78 KiB
C
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/*
* VXLAN: Virtual eXtensible Local Area Network
*
* Copyright (c) 2012-2013 Vyatta Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/rculist.h>
#include <linux/netdevice.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/udp.h>
#include <linux/igmp.h>
#include <linux/etherdevice.h>
#include <linux/if_ether.h>
#include <linux/if_vlan.h>
#include <linux/hash.h>
#include <linux/ethtool.h>
#include <net/arp.h>
#include <net/ndisc.h>
#include <net/ip.h>
#include <net/ip_tunnels.h>
#include <net/icmp.h>
#include <net/udp.h>
#include <net/udp_tunnel.h>
#include <net/rtnetlink.h>
#include <net/route.h>
#include <net/dsfield.h>
#include <net/inet_ecn.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
#include <net/vxlan.h>
#include <net/protocol.h>
#include <net/udp_tunnel.h>
#if IS_ENABLED(CONFIG_IPV6)
#include <net/ipv6.h>
#include <net/addrconf.h>
#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 VNI_HASH_BITS 10
#define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
#define FDB_HASH_BITS 8
#define FDB_HASH_SIZE (1<<FDB_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 int vxlan_net_id;
static const u8 all_zeros_mac[ETH_ALEN];
/* 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;
};
union vxlan_addr {
struct sockaddr_in sin;
struct sockaddr_in6 sin6;
struct sockaddr sa;
};
struct vxlan_rdst {
union vxlan_addr remote_ip;
__be16 remote_port;
u32 remote_vni;
u32 remote_ifindex;
struct list_head list;
struct rcu_head rcu;
};
/* 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;
u16 state; /* see ndm_state */
u8 flags; /* see ndm_flags */
u8 eth_addr[ETH_ALEN];
};
/* Pseudo network device */
struct vxlan_dev {
struct hlist_node hlist; /* vni hash table */
struct list_head next; /* vxlan's per namespace list */
struct vxlan_sock *vn_sock; /* listening socket */
struct net_device *dev;
struct net *net; /* netns for packet i/o */
struct vxlan_rdst default_dst; /* default destination */
union vxlan_addr saddr; /* source address */
__be16 dst_port;
__u16 port_min; /* source port range */
__u16 port_max;
__u8 tos; /* TOS override */
__u8 ttl;
u32 flags; /* VXLAN_F_* in vxlan.h */
struct work_struct sock_work;
struct work_struct igmp_join;
struct work_struct igmp_leave;
unsigned long age_interval;
struct timer_list age_timer;
spinlock_t hash_lock;
unsigned int addrcnt;
unsigned int addrmax;
struct hlist_head fdb_head[FDB_HASH_SIZE];
};
/* salt for hash table */
static u32 vxlan_salt __read_mostly;
static struct workqueue_struct *vxlan_wq;
static void vxlan_sock_work(struct work_struct *work);
#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 inline bool vxlan_addr_any(const union vxlan_addr *ipa)
{
if (ipa->sa.sa_family == AF_INET6)
return ipv6_addr_any(&ipa->sin6.sin6_addr);
else
return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
}
static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
{
if (ipa->sa.sa_family == AF_INET6)
return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr);
else
return IN_MULTICAST(ntohl(ipa->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)) {
nla_memcpy(&ip->sin6.sin6_addr, nla, sizeof(struct in6_addr));
ip->sa.sa_family = AF_INET6;
return 0;
} else if (nla_len(nla) >= sizeof(__be32)) {
ip->sin.sin_addr.s_addr = nla_get_be32(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(skb, attr, sizeof(struct in6_addr), &ip->sin6.sin6_addr);
else
return nla_put_be32(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 inline bool vxlan_addr_any(const union vxlan_addr *ipa)
{
return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY);
}
static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa)
{
return IN_MULTICAST(ntohl(ipa->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_be32(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_be32(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, u32 id)
{
return &vs->vni_list[hash_32(id, 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)
{
return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
}
static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
{
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)
{
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 &&
inet_sk(vs->sock->sk)->sk.sk_family == family &&
vs->flags == flags)
return vs;
}
return NULL;
}
static struct vxlan_dev *vxlan_vs_find_vni(struct vxlan_sock *vs, u32 id)
{
struct vxlan_dev *vxlan;
hlist_for_each_entry_rcu(vxlan, vni_head(vs, id), hlist) {
if (vxlan->default_dst.remote_vni == id)
return vxlan;
}
return NULL;
}
/* Look up VNI in a per net namespace table */
static struct vxlan_dev *vxlan_find_vni(struct net *net, u32 id,
sa_family_t family, __be16 port,
u32 flags)
{
struct vxlan_sock *vs;
vs = vxlan_find_sock(net, family, port, flags);
if (!vs)
return NULL;
return vxlan_vs_find_vni(vs, id);
}
/* 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;
struct nlmsghdr *nlh;
struct ndmsg *ndm;
bool send_ip, send_eth;
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;
if (type == RTM_GETNEIGH) {
ndm->ndm_family = AF_INET;
send_ip = !vxlan_addr_any(&rdst->remote_ip);
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;
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 (send_ip && vxlan_nla_put_addr(skb, NDA_DST, &rdst->remote_ip))
goto nla_put_failure;
if (rdst->remote_port && rdst->remote_port != vxlan->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, rdst->remote_vni))
goto nla_put_failure;
if (rdst->remote_ifindex &&
nla_put_u32(skb, NDA_IFINDEX, rdst->remote_ifindex))
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_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 = VXLAN_N_VID,
};
vxlan_fdb_notify(vxlan, &f, &remote, RTM_GETNEIGH);
}
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);
}
/* 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);
}
/* Hash chain to use given mac address */
static inline struct hlist_head *vxlan_fdb_head(struct vxlan_dev *vxlan,
const u8 *mac)
{
return &vxlan->fdb_head[eth_hash(mac)];
}
/* Look up Ethernet address in forwarding table */
static struct vxlan_fdb *__vxlan_find_mac(struct vxlan_dev *vxlan,
const u8 *mac)
{
struct hlist_head *head = vxlan_fdb_head(vxlan, mac);
struct vxlan_fdb *f;
hlist_for_each_entry_rcu(f, head, hlist) {
if (ether_addr_equal(mac, f->eth_addr))
return f;
}
return NULL;
}
static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
const u8 *mac)
{
struct vxlan_fdb *f;
f = __vxlan_find_mac(vxlan, mac);
if (f)
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,
__u32 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;
}
/* Replace destination of unicast mac */
static int vxlan_fdb_replace(struct vxlan_fdb *f,
union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex)
{
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;
rd->remote_ip = *ip;
rd->remote_port = port;
rd->remote_vni = vni;
rd->remote_ifindex = ifindex;
return 1;
}
/* Add/update destinations for multicast */
static int vxlan_fdb_append(struct vxlan_fdb *f,
union vxlan_addr *ip, __be16 port, __u32 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;
rd->remote_ip = *ip;
rd->remote_port = port;
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,
u32 data, struct gro_remcsum *grc,
bool nopartial)
{
size_t start, offset, plen;
if (skb->remcsum_offload)
return NULL;
if (!NAPI_GRO_CB(skb)->csum_valid)
return NULL;
start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
offset = start + ((data & VXLAN_RCO_UDP) ?
offsetof(struct udphdr, check) :
offsetof(struct tcphdr, check));
plen = hdrlen + offset + sizeof(u16);
/* Pull checksum that will be written */
if (skb_gro_header_hard(skb, off + plen)) {
vh = skb_gro_header_slow(skb, off + plen, off);
if (!vh)
return NULL;
}
skb_gro_remcsum_process(skb, (void *)vh + hdrlen,
start, offset, grc, nopartial);
skb->remcsum_offload = 1;
return vh;
}
static struct sk_buff **vxlan_gro_receive(struct sk_buff **head,
struct sk_buff *skb,
struct udp_offload *uoff)
{
struct sk_buff *p, **pp = NULL;
struct vxlanhdr *vh, *vh2;
unsigned int hlen, off_vx;
int flush = 1;
struct vxlan_sock *vs = container_of(uoff, struct vxlan_sock,
udp_offloads);
u32 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_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
flags = ntohl(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),
ntohl(vh->vx_vni), &grc,
!!(vs->flags &
VXLAN_F_REMCSUM_NOPARTIAL));
if (!vh)
goto out;
}
flush = 0;
for (p = *head; p; p = p->next) {
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 = eth_gro_receive(head, skb);
out:
skb_gro_remcsum_cleanup(skb, &grc);
NAPI_GRO_CB(skb)->flush |= flush;
return pp;
}
static int vxlan_gro_complete(struct sk_buff *skb, int nhoff,
struct udp_offload *uoff)
{
udp_tunnel_gro_complete(skb, nhoff);
return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
}
/* Notify netdevs that UDP port started listening */
static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
{
struct net_device *dev;
struct sock *sk = vs->sock->sk;
struct net *net = sock_net(sk);
sa_family_t sa_family = sk->sk_family;
__be16 port = inet_sk(sk)->inet_sport;
int err;
if (sa_family == AF_INET) {
err = udp_add_offload(&vs->udp_offloads);
if (err)
pr_warn("vxlan: udp_add_offload failed with status %d\n", err);
}
rcu_read_lock();
for_each_netdev_rcu(net, dev) {
if (dev->netdev_ops->ndo_add_vxlan_port)
dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
port);
}
rcu_read_unlock();
}
/* Notify netdevs that UDP port is no more listening */
static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
{
struct net_device *dev;
struct sock *sk = vs->sock->sk;
struct net *net = sock_net(sk);
sa_family_t sa_family = sk->sk_family;
__be16 port = inet_sk(sk)->inet_sport;
rcu_read_lock();
for_each_netdev_rcu(net, dev) {
if (dev->netdev_ops->ndo_del_vxlan_port)
dev->netdev_ops->ndo_del_vxlan_port(dev, sa_family,
port);
}
rcu_read_unlock();
if (sa_family == AF_INET)
udp_del_offload(&vs->udp_offloads);
}
/* Add new entry to forwarding table -- assumes lock held */
static int vxlan_fdb_create(struct vxlan_dev *vxlan,
const u8 *mac, union vxlan_addr *ip,
__u16 state, __u16 flags,
__be16 port, __u32 vni, __u32 ifindex,
__u8 ndm_flags)
{
struct vxlan_rdst *rd = NULL;
struct vxlan_fdb *f;
int notify = 0;
f = __vxlan_find_mac(vxlan, mac);
if (f) {
if (flags & NLM_F_EXCL) {
netdev_dbg(vxlan->dev,
"lost race to create %pM\n", mac);
return -EEXIST;
}
if (f->state != state) {
f->state = state;
f->updated = jiffies;
notify = 1;
}
if (f->flags != ndm_flags) {
f->flags = ndm_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))) {
int rc = vxlan_fdb_replace(f, ip, port, vni,
ifindex);
if (rc < 0)
return rc;
notify |= rc;
} else
return -EOPNOTSUPP;
}
if ((flags & NLM_F_APPEND) &&
(is_multicast_ether_addr(f->eth_addr) ||
is_zero_ether_addr(f->eth_addr))) {
int rc = vxlan_fdb_append(f, ip, port, vni, ifindex,
&rd);
if (rc < 0)
return rc;
notify |= rc;
}
} else {
if (!(flags & NLM_F_CREATE))
return -ENOENT;
if (vxlan->addrmax && vxlan->addrcnt >= vxlan->addrmax)
return -ENOSPC;
/* 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);
f = kmalloc(sizeof(*f), GFP_ATOMIC);
if (!f)
return -ENOMEM;
notify = 1;
f->state = state;
f->flags = ndm_flags;
f->updated = f->used = jiffies;
INIT_LIST_HEAD(&f->remotes);
memcpy(f->eth_addr, mac, ETH_ALEN);
vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
++vxlan->addrcnt;
hlist_add_head_rcu(&f->hlist,
vxlan_fdb_head(vxlan, mac));
}
if (notify) {
if (rd == NULL)
rd = first_remote_rtnl(f);
vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
}
return 0;
}
static void vxlan_fdb_free(struct rcu_head *head)
{
struct vxlan_fdb *f = container_of(head, struct vxlan_fdb, rcu);
struct vxlan_rdst *rd, *nd;
list_for_each_entry_safe(rd, nd, &f->remotes, list)
kfree(rd);
kfree(f);
}
static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
{
netdev_dbg(vxlan->dev,
"delete %pM\n", f->eth_addr);
--vxlan->addrcnt;
vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_DELNEIGH);
hlist_del_rcu(&f->hlist);
call_rcu(&f->rcu, vxlan_fdb_free);
}
static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
union vxlan_addr *ip, __be16 *port, u32 *vni, u32 *ifindex)
{
struct net *net = dev_net(vxlan->dev);
int err;
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->dst_port;
}
if (tb[NDA_VNI]) {
if (nla_len(tb[NDA_VNI]) != sizeof(u32))
return -EINVAL;
*vni = nla_get_u32(tb[NDA_VNI]);
} else {
*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;
}
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 vxlan_dev *vxlan = netdev_priv(dev);
/* struct net *net = dev_net(vxlan->dev); */
union vxlan_addr ip;
__be16 port;
u32 vni, ifindex;
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[NDA_DST] == NULL)
return -EINVAL;
err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
if (err)
return err;
if (vxlan->default_dst.remote_ip.sa.sa_family != ip.sa.sa_family)
return -EAFNOSUPPORT;
spin_lock_bh(&vxlan->hash_lock);
err = vxlan_fdb_create(vxlan, addr, &ip, ndm->ndm_state, flags,
port, vni, ifindex, ndm->ndm_flags);
spin_unlock_bh(&vxlan->hash_lock);
return err;
}
/* 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);
struct vxlan_fdb *f;
struct vxlan_rdst *rd = NULL;
union vxlan_addr ip;
__be16 port;
u32 vni, ifindex;
int err;
err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &vni, &ifindex);
if (err)
return err;
err = -ENOENT;
spin_lock_bh(&vxlan->hash_lock);
f = vxlan_find_mac(vxlan, addr);
if (!f)
goto out;
if (!vxlan_addr_any(&ip)) {
rd = vxlan_fdb_find_rdst(f, &ip, port, vni, ifindex);
if (!rd)
goto out;
}
err = 0;
/* 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)) {
list_del_rcu(&rd->list);
vxlan_fdb_notify(vxlan, f, rd, RTM_DELNEIGH);
kfree_rcu(rd, rcu);
goto out;
}
vxlan_fdb_destroy(vxlan, f);
out:
spin_unlock_bh(&vxlan->hash_lock);
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;
for (h = 0; h < FDB_HASH_SIZE; ++h) {
struct vxlan_fdb *f;
int err;
hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
struct vxlan_rdst *rd;
if (idx < cb->args[0])
goto skip;
list_for_each_entry_rcu(rd, &f->remotes, list) {
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)
goto out;
}
skip:
++idx;
}
}
out:
return idx;
}
/* Watch incoming packets to learn mapping between Ethernet address
* and Tunnel endpoint.
* Return true if packet is bogus and should be droppped.
*/
static bool vxlan_snoop(struct net_device *dev,
union vxlan_addr *src_ip, const u8 *src_mac)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
struct vxlan_fdb *f;
f = vxlan_find_mac(vxlan, src_mac);
if (likely(f)) {
struct vxlan_rdst *rdst = first_remote_rcu(f);
if (likely(vxlan_addr_equal(&rdst->remote_ip, src_ip)))
return false;
/* Don't migrate static entries, drop packets */
if (f->state & NUD_NOARP)
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);
} else {
/* learned new entry */
spin_lock(&vxlan->hash_lock);
/* close off race between vxlan_flush and incoming packets */
if (netif_running(dev))
vxlan_fdb_create(vxlan, src_mac, src_ip,
NUD_REACHABLE,
NLM_F_EXCL|NLM_F_CREATE,
vxlan->dst_port,
vxlan->default_dst.remote_vni,
0, NTF_SELF);
spin_unlock(&vxlan->hash_lock);
}
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;
/* The vxlan_sock is only used by dev, leaving group has
* no effect on other vxlan devices.
*/
if (atomic_read(&dev->vn_sock->refcnt) == 1)
return false;
list_for_each_entry(vxlan, &vn->vxlan_list, next) {
if (!netif_running(vxlan->dev) || vxlan == dev)
continue;
if (vxlan->vn_sock != dev->vn_sock)
continue;
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 void vxlan_sock_hold(struct vxlan_sock *vs)
{
atomic_inc(&vs->refcnt);
}
void vxlan_sock_release(struct vxlan_sock *vs)
{
struct sock *sk = vs->sock->sk;
struct net *net = sock_net(sk);
struct vxlan_net *vn = net_generic(net, vxlan_net_id);
if (!atomic_dec_and_test(&vs->refcnt))
return;
spin_lock(&vn->sock_lock);
hlist_del_rcu(&vs->hlist);
vxlan_notify_del_rx_port(vs);
spin_unlock(&vn->sock_lock);
queue_work(vxlan_wq, &vs->del_work);
}
EXPORT_SYMBOL_GPL(vxlan_sock_release);
/* Callback to update multicast group membership when first VNI on
* multicast asddress is brought up
* Done as workqueue because ip_mc_join_group acquires RTNL.
*/
static void vxlan_igmp_join(struct work_struct *work)
{
struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_join);
struct vxlan_sock *vs = vxlan->vn_sock;
struct sock *sk = vs->sock->sk;
union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
int ifindex = vxlan->default_dst.remote_ifindex;
lock_sock(sk);
if (ip->sa.sa_family == AF_INET) {
struct ip_mreqn mreq = {
.imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
.imr_ifindex = ifindex,
};
ip_mc_join_group(sk, &mreq);
#if IS_ENABLED(CONFIG_IPV6)
} else {
ipv6_stub->ipv6_sock_mc_join(sk, ifindex,
&ip->sin6.sin6_addr);
#endif
}
release_sock(sk);
vxlan_sock_release(vs);
dev_put(vxlan->dev);
}
/* Inverse of vxlan_igmp_join when last VNI is brought down */
static void vxlan_igmp_leave(struct work_struct *work)
{
struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, igmp_leave);
struct vxlan_sock *vs = vxlan->vn_sock;
struct sock *sk = vs->sock->sk;
union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
int ifindex = vxlan->default_dst.remote_ifindex;
lock_sock(sk);
if (ip->sa.sa_family == AF_INET) {
struct ip_mreqn mreq = {
.imr_multiaddr.s_addr = ip->sin.sin_addr.s_addr,
.imr_ifindex = ifindex,
};
ip_mc_leave_group(sk, &mreq);
#if IS_ENABLED(CONFIG_IPV6)
} else {
ipv6_stub->ipv6_sock_mc_drop(sk, ifindex,
&ip->sin6.sin6_addr);
#endif
}
release_sock(sk);
vxlan_sock_release(vs);
dev_put(vxlan->dev);
}
static struct vxlanhdr *vxlan_remcsum(struct sk_buff *skb, struct vxlanhdr *vh,
size_t hdrlen, u32 data, bool nopartial)
{
size_t start, offset, plen;
start = (data & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
offset = start + ((data & VXLAN_RCO_UDP) ?
offsetof(struct udphdr, check) :
offsetof(struct tcphdr, check));
plen = hdrlen + offset + sizeof(u16);
if (!pskb_may_pull(skb, plen))
return NULL;
vh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
skb_remcsum_process(skb, (void *)vh + hdrlen, start, offset,
nopartial);
return vh;
}
/* Callback from net/ipv4/udp.c to receive packets */
static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
{
struct vxlan_sock *vs;
struct vxlanhdr *vxh;
u32 flags, vni;
struct vxlan_metadata md = {0};
/* Need Vxlan and inner Ethernet header to be present */
if (!pskb_may_pull(skb, VXLAN_HLEN))
goto error;
vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
flags = ntohl(vxh->vx_flags);
vni = ntohl(vxh->vx_vni);
if (flags & VXLAN_HF_VNI) {
flags &= ~VXLAN_HF_VNI;
} else {
/* VNI flag always required to be set */
goto bad_flags;
}
if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
goto drop;
vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
vs = rcu_dereference_sk_user_data(sk);
if (!vs)
goto drop;
if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
vxh = vxlan_remcsum(skb, vxh, sizeof(struct vxlanhdr), vni,
!!(vs->flags & VXLAN_F_REMCSUM_NOPARTIAL));
if (!vxh)
goto drop;
flags &= ~VXLAN_HF_RCO;
vni &= VXLAN_VNI_MASK;
}
/* For backwards compatibility, only allow reserved fields to be
* used by VXLAN extensions if explicitly requested.
*/
if ((flags & VXLAN_HF_GBP) && (vs->flags & VXLAN_F_GBP)) {
struct vxlanhdr_gbp *gbp;
gbp = (struct vxlanhdr_gbp *)vxh;
md.gbp = ntohs(gbp->policy_id);
if (gbp->dont_learn)
md.gbp |= VXLAN_GBP_DONT_LEARN;
if (gbp->policy_applied)
md.gbp |= VXLAN_GBP_POLICY_APPLIED;
flags &= ~VXLAN_GBP_USED_BITS;
}
if (flags || vni & ~VXLAN_VNI_MASK) {
/* 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 compatbility with previous stack code, and also
* is more robust and provides a little more security in
* adding extensions to VXLAN.
*/
goto bad_flags;
}
md.vni = vxh->vx_vni;
vs->rcv(vs, skb, &md);
return 0;
drop:
/* Consume bad packet */
kfree_skb(skb);
return 0;
bad_flags:
netdev_dbg(skb->dev, "invalid vxlan flags=%#x vni=%#x\n",
ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
error:
/* Return non vxlan pkt */
return 1;
}
static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb,
struct vxlan_metadata *md)
{
struct iphdr *oip = NULL;
struct ipv6hdr *oip6 = NULL;
struct vxlan_dev *vxlan;
struct pcpu_sw_netstats *stats;
union vxlan_addr saddr;
__u32 vni;
int err = 0;
union vxlan_addr *remote_ip;
vni = ntohl(md->vni) >> 8;
/* Is this VNI defined? */
vxlan = vxlan_vs_find_vni(vs, vni);
if (!vxlan)
goto drop;
remote_ip = &vxlan->default_dst.remote_ip;
skb_reset_mac_header(skb);
skb_scrub_packet(skb, !net_eq(vxlan->net, dev_net(vxlan->dev)));
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))
goto drop;
/* Re-examine inner Ethernet packet */
if (remote_ip->sa.sa_family == AF_INET) {
oip = ip_hdr(skb);
saddr.sin.sin_addr.s_addr = oip->saddr;
saddr.sa.sa_family = AF_INET;
#if IS_ENABLED(CONFIG_IPV6)
} else {
oip6 = ipv6_hdr(skb);
saddr.sin6.sin6_addr = oip6->saddr;
saddr.sa.sa_family = AF_INET6;
#endif
}
if ((vxlan->flags & VXLAN_F_LEARN) &&
vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
goto drop;
skb_reset_network_header(skb);
skb->mark = md->gbp;
if (oip6)
err = IP6_ECN_decapsulate(oip6, skb);
if (oip)
err = IP_ECN_decapsulate(oip, skb);
if (unlikely(err)) {
if (log_ecn_error) {
if (oip6)
net_info_ratelimited("non-ECT from %pI6\n",
&oip6->saddr);
if (oip)
net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
&oip->saddr, oip->tos);
}
if (err > 1) {
++vxlan->dev->stats.rx_frame_errors;
++vxlan->dev->stats.rx_errors;
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);
netif_rx(skb);
return;
drop:
/* Consume bad packet */
kfree_skb(skb);
}
static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
{
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);
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->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)
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_set_mac_header(reply, 0);
ns = (struct nd_msg *)skb_transport_header(request);
daddr = eth_hdr(request)->h_source;
ns_olen = request->len - skb_transport_offset(request) - sizeof(*ns);
for (i = 0; i < ns_olen-1; i += (ns->opt[i+1]<<3)) {
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_set_network_header(reply, 0);
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_set_transport_header(reply, 0);
na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);
/* Neighbor Advertisement */
memset(na, 0, 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)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
struct nd_msg *msg;
const struct ipv6hdr *iphdr;
const struct in6_addr *saddr, *daddr;
struct neighbour *n;
struct inet6_dev *in6_dev;
in6_dev = __in6_dev_get(dev);
if (!in6_dev)
goto out;
iphdr = ipv6_hdr(skb);
saddr = &iphdr->saddr;
daddr = &iphdr->daddr;
msg = (struct nd_msg *)skb_transport_header(skb);
if (msg->icmph.icmp6_code != 0 ||
msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
goto out;
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);
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->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->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->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 |= htonl(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);
}
#if IS_ENABLED(CONFIG_IPV6)
static int vxlan6_xmit_skb(struct dst_entry *dst, struct sk_buff *skb,
struct net_device *dev, struct in6_addr *saddr,
struct in6_addr *daddr, __u8 prio, __u8 ttl,
__be16 src_port, __be16 dst_port,
struct vxlan_metadata *md, bool xnet, u32 vxflags)
{
struct vxlanhdr *vxh;
int min_headroom;
int err;
bool udp_sum = !(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX);
int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
u16 hdrlen = sizeof(struct vxlanhdr);
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))) {
udp_sum = false;
type |= SKB_GSO_TUNNEL_REMCSUM;
}
}
skb = iptunnel_handle_offloads(skb, udp_sum, type);
if (IS_ERR(skb)) {
err = -EINVAL;
goto err;
}
skb_scrub_packet(skb, xnet);
min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
+ VXLAN_HLEN + sizeof(struct ipv6hdr)
+ (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
/* Need space for new headers (invalidates iph ptr) */
err = skb_cow_head(skb, min_headroom);
if (unlikely(err)) {
kfree_skb(skb);
goto err;
}
skb = vlan_hwaccel_push_inside(skb);
if (WARN_ON(!skb)) {
err = -ENOMEM;
goto err;
}
vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
vxh->vx_flags = htonl(VXLAN_HF_VNI);
vxh->vx_vni = md->vni;
if (type & SKB_GSO_TUNNEL_REMCSUM) {
u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
VXLAN_RCO_SHIFT;
if (skb->csum_offset == offsetof(struct udphdr, check))
data |= VXLAN_RCO_UDP;
vxh->vx_vni |= htonl(data);
vxh->vx_flags |= htonl(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);
skb_set_inner_protocol(skb, htons(ETH_P_TEB));
udp_tunnel6_xmit_skb(dst, skb, dev, saddr, daddr, prio,
ttl, src_port, dst_port,
!!(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX));
return 0;
err:
dst_release(dst);
return err;
}
#endif
int vxlan_xmit_skb(struct rtable *rt, struct sk_buff *skb,
__be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
__be16 src_port, __be16 dst_port,
struct vxlan_metadata *md, bool xnet, u32 vxflags)
{
struct vxlanhdr *vxh;
int min_headroom;
int err;
bool udp_sum = !!(vxflags & VXLAN_F_UDP_CSUM);
int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
u16 hdrlen = sizeof(struct vxlanhdr);
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))) {
udp_sum = false;
type |= SKB_GSO_TUNNEL_REMCSUM;
}
}
skb = iptunnel_handle_offloads(skb, udp_sum, type);
if (IS_ERR(skb))
return PTR_ERR(skb);
min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
+ VXLAN_HLEN + sizeof(struct iphdr)
+ (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
/* Need space for new headers (invalidates iph ptr) */
err = skb_cow_head(skb, min_headroom);
if (unlikely(err)) {
kfree_skb(skb);
return err;
}
skb = vlan_hwaccel_push_inside(skb);
if (WARN_ON(!skb))
return -ENOMEM;
vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
vxh->vx_flags = htonl(VXLAN_HF_VNI);
vxh->vx_vni = md->vni;
if (type & SKB_GSO_TUNNEL_REMCSUM) {
u32 data = (skb_checksum_start_offset(skb) - hdrlen) >>
VXLAN_RCO_SHIFT;
if (skb->csum_offset == offsetof(struct udphdr, check))
data |= VXLAN_RCO_UDP;
vxh->vx_vni |= htonl(data);
vxh->vx_flags |= htonl(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);
skb_set_inner_protocol(skb, htons(ETH_P_TEB));
return udp_tunnel_xmit_skb(rt, skb, src, dst, tos,
ttl, df, src_port, dst_port, xnet,
!(vxflags & VXLAN_F_UDP_CSUM));
}
EXPORT_SYMBOL_GPL(vxlan_xmit_skb);
/* 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)
{
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 = skb->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
}
if (dst_vxlan->flags & VXLAN_F_LEARN)
vxlan_snoop(skb->dev, &loopback, eth_hdr(skb)->h_source);
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 {
dev->stats.rx_dropped++;
}
}
static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
struct vxlan_rdst *rdst, bool did_rsc)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
struct rtable *rt = NULL;
const struct iphdr *old_iph;
struct flowi4 fl4;
union vxlan_addr *dst;
struct vxlan_metadata md;
__be16 src_port = 0, dst_port;
u32 vni;
__be16 df = 0;
__u8 tos, ttl;
int err;
dst_port = rdst->remote_port ? rdst->remote_port : vxlan->dst_port;
vni = rdst->remote_vni;
dst = &rdst->remote_ip;
if (vxlan_addr_any(dst)) {
if (did_rsc) {
/* short-circuited back to local bridge */
vxlan_encap_bypass(skb, vxlan, vxlan);
return;
}
goto drop;
}
old_iph = ip_hdr(skb);
ttl = vxlan->ttl;
if (!ttl && vxlan_addr_multicast(dst))
ttl = 1;
tos = vxlan->tos;
if (tos == 1)
tos = ip_tunnel_get_dsfield(old_iph, skb);
src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->port_min,
vxlan->port_max, true);
if (dst->sa.sa_family == AF_INET) {
memset(&fl4, 0, sizeof(fl4));
fl4.flowi4_oif = rdst->remote_ifindex;
fl4.flowi4_tos = RT_TOS(tos);
fl4.daddr = dst->sin.sin_addr.s_addr;
fl4.saddr = vxlan->saddr.sin.sin_addr.s_addr;
rt = ip_route_output_key(vxlan->net, &fl4);
if (IS_ERR(rt)) {
netdev_dbg(dev, "no route to %pI4\n",
&dst->sin.sin_addr.s_addr);
dev->stats.tx_carrier_errors++;
goto tx_error;
}
if (rt->dst.dev == dev) {
netdev_dbg(dev, "circular route to %pI4\n",
&dst->sin.sin_addr.s_addr);
dev->stats.collisions++;
goto rt_tx_error;
}
/* Bypass encapsulation if the destination is local */
if (rt->rt_flags & RTCF_LOCAL &&
!(rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
struct vxlan_dev *dst_vxlan;
ip_rt_put(rt);
dst_vxlan = vxlan_find_vni(vxlan->net, vni,
dst->sa.sa_family, dst_port,
vxlan->flags);
if (!dst_vxlan)
goto tx_error;
vxlan_encap_bypass(skb, vxlan, dst_vxlan);
return;
}
tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
md.vni = htonl(vni << 8);
md.gbp = skb->mark;
err = vxlan_xmit_skb(rt, skb, fl4.saddr,
dst->sin.sin_addr.s_addr, tos, ttl, df,
src_port, dst_port, &md,
!net_eq(vxlan->net, dev_net(vxlan->dev)),
vxlan->flags);
if (err < 0) {
/* skb is already freed. */
skb = NULL;
goto rt_tx_error;
}
iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
#if IS_ENABLED(CONFIG_IPV6)
} else {
struct sock *sk = vxlan->vn_sock->sock->sk;
struct dst_entry *ndst;
struct flowi6 fl6;
u32 flags;
memset(&fl6, 0, sizeof(fl6));
fl6.flowi6_oif = rdst->remote_ifindex;
fl6.daddr = dst->sin6.sin6_addr;
fl6.saddr = vxlan->saddr.sin6.sin6_addr;
fl6.flowi6_proto = IPPROTO_UDP;
if (ipv6_stub->ipv6_dst_lookup(sk, &ndst, &fl6)) {
netdev_dbg(dev, "no route to %pI6\n",
&dst->sin6.sin6_addr);
dev->stats.tx_carrier_errors++;
goto tx_error;
}
if (ndst->dev == dev) {
netdev_dbg(dev, "circular route to %pI6\n",
&dst->sin6.sin6_addr);
dst_release(ndst);
dev->stats.collisions++;
goto tx_error;
}
/* Bypass encapsulation if the destination is local */
flags = ((struct rt6_info *)ndst)->rt6i_flags;
if (flags & RTF_LOCAL &&
!(flags & (RTCF_BROADCAST | RTCF_MULTICAST))) {
struct vxlan_dev *dst_vxlan;
dst_release(ndst);
dst_vxlan = vxlan_find_vni(vxlan->net, vni,
dst->sa.sa_family, dst_port,
vxlan->flags);
if (!dst_vxlan)
goto tx_error;
vxlan_encap_bypass(skb, vxlan, dst_vxlan);
return;
}
ttl = ttl ? : ip6_dst_hoplimit(ndst);
md.vni = htonl(vni << 8);
md.gbp = skb->mark;
err = vxlan6_xmit_skb(ndst, skb, dev, &fl6.saddr, &fl6.daddr,
0, ttl, src_port, dst_port, &md,
!net_eq(vxlan->net, dev_net(vxlan->dev)),
vxlan->flags);
#endif
}
return;
drop:
dev->stats.tx_dropped++;
goto tx_free;
rt_tx_error:
ip_rt_put(rt);
tx_error:
dev->stats.tx_errors++;
tx_free:
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 ethhdr *eth;
bool did_rsc = false;
struct vxlan_rdst *rdst, *fdst = NULL;
struct vxlan_fdb *f;
skb_reset_mac_header(skb);
eth = eth_hdr(skb);
if ((vxlan->flags & VXLAN_F_PROXY)) {
if (ntohs(eth->h_proto) == ETH_P_ARP)
return arp_reduce(dev, skb);
#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 *msg;
msg = (struct nd_msg *)skb_transport_header(skb);
if (msg->icmph.icmp6_code == 0 &&
msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
return neigh_reduce(dev, skb);
}
eth = eth_hdr(skb);
#endif
}
f = vxlan_find_mac(vxlan, eth->h_dest);
did_rsc = false;
if (f && (f->flags & NTF_ROUTER) && (vxlan->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);
}
if (f == NULL) {
f = vxlan_find_mac(vxlan, all_zeros_mac);
if (f == NULL) {
if ((vxlan->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;
}
}
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, rdst, did_rsc);
}
if (fdst)
vxlan_xmit_one(skb, dev, fdst, did_rsc);
else
kfree_skb(skb);
return NETDEV_TX_OK;
}
/* Walk the forwarding table and purge stale entries */
static void vxlan_cleanup(unsigned long arg)
{
struct vxlan_dev *vxlan = (struct vxlan_dev *) arg;
unsigned long next_timer = jiffies + FDB_AGE_INTERVAL;
unsigned int h;
if (!netif_running(vxlan->dev))
return;
spin_lock_bh(&vxlan->hash_lock);
for (h = 0; h < FDB_HASH_SIZE; ++h) {
struct hlist_node *p, *n;
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)
continue;
timeout = f->used + vxlan->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);
} else if (time_before(timeout, next_timer))
next_timer = timeout;
}
}
spin_unlock_bh(&vxlan->hash_lock);
mod_timer(&vxlan->age_timer, next_timer);
}
static void vxlan_vs_add_dev(struct vxlan_sock *vs, struct vxlan_dev *vxlan)
{
__u32 vni = vxlan->default_dst.remote_vni;
vxlan->vn_sock = vs;
hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
}
/* Setup stats when device is created */
static int vxlan_init(struct net_device *dev)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
struct vxlan_sock *vs;
bool ipv6 = vxlan->flags & VXLAN_F_IPV6;
dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
if (!dev->tstats)
return -ENOMEM;
spin_lock(&vn->sock_lock);
vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET,
vxlan->dst_port, vxlan->flags);
if (vs && atomic_add_unless(&vs->refcnt, 1, 0)) {
/* If we have a socket with same port already, reuse it */
vxlan_vs_add_dev(vs, vxlan);
} else {
/* otherwise make new socket outside of RTNL */
dev_hold(dev);
queue_work(vxlan_wq, &vxlan->sock_work);
}
spin_unlock(&vn->sock_lock);
return 0;
}
static void vxlan_fdb_delete_default(struct vxlan_dev *vxlan)
{
struct vxlan_fdb *f;
spin_lock_bh(&vxlan->hash_lock);
f = __vxlan_find_mac(vxlan, all_zeros_mac);
if (f)
vxlan_fdb_destroy(vxlan, f);
spin_unlock_bh(&vxlan->hash_lock);
}
static void vxlan_uninit(struct net_device *dev)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
struct vxlan_sock *vs = vxlan->vn_sock;
vxlan_fdb_delete_default(vxlan);
if (vs)
vxlan_sock_release(vs);
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);
struct vxlan_sock *vs = vxlan->vn_sock;
/* socket hasn't been created */
if (!vs)
return -ENOTCONN;
if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
vxlan_sock_hold(vs);
dev_hold(dev);
queue_work(vxlan_wq, &vxlan->igmp_join);
}
if (vxlan->age_interval)
mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
return 0;
}
/* Purge the forwarding table */
static void vxlan_flush(struct vxlan_dev *vxlan)
{
unsigned int h;
spin_lock_bh(&vxlan->hash_lock);
for (h = 0; h < FDB_HASH_SIZE; ++h) {
struct hlist_node *p, *n;
hlist_for_each_safe(p, n, &vxlan->fdb_head[h]) {
struct vxlan_fdb *f
= container_of(p, struct vxlan_fdb, hlist);
/* the all_zeros_mac entry is deleted at vxlan_uninit */
if (!is_zero_ether_addr(f->eth_addr))
vxlan_fdb_destroy(vxlan, f);
}
}
spin_unlock_bh(&vxlan->hash_lock);
}
/* 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);
struct vxlan_sock *vs = vxlan->vn_sock;
if (vs && vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
!vxlan_group_used(vn, vxlan)) {
vxlan_sock_hold(vs);
dev_hold(dev);
queue_work(vxlan_wq, &vxlan->igmp_leave);
}
del_timer_sync(&vxlan->age_timer);
vxlan_flush(vxlan);
return 0;
}
/* 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;
int max_mtu;
lowerdev = __dev_get_by_index(vxlan->net, dst->remote_ifindex);
if (lowerdev == NULL)
return eth_change_mtu(dev, new_mtu);
if (dst->remote_ip.sa.sa_family == AF_INET6)
max_mtu = lowerdev->mtu - VXLAN6_HEADROOM;
else
max_mtu = lowerdev->mtu - VXLAN_HEADROOM;
if (new_mtu < 68 || new_mtu > max_mtu)
return -EINVAL;
dev->mtu = new_mtu;
return 0;
}
static const struct net_device_ops vxlan_netdev_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,
};
/* Info for udev, that this is a virtual tunnel endpoint */
static struct device_type vxlan_type = {
.name = "vxlan",
};
/* Calls the ndo_add_vxlan_port of the caller in order to
* supply the listening VXLAN udp ports. Callers are expected
* to implement the ndo_add_vxlan_port.
*/
void vxlan_get_rx_port(struct net_device *dev)
{
struct vxlan_sock *vs;
struct net *net = dev_net(dev);
struct vxlan_net *vn = net_generic(net, vxlan_net_id);
sa_family_t sa_family;
__be16 port;
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) {
port = inet_sk(vs->sock->sk)->inet_sport;
sa_family = vs->sock->sk->sk_family;
dev->netdev_ops->ndo_add_vxlan_port(dev, sa_family,
port);
}
}
spin_unlock(&vn->sock_lock);
}
EXPORT_SYMBOL_GPL(vxlan_get_rx_port);
/* 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);
if (vxlan->default_dst.remote_ip.sa.sa_family == AF_INET6)
dev->needed_headroom = ETH_HLEN + VXLAN6_HEADROOM;
else
dev->needed_headroom = ETH_HLEN + VXLAN_HEADROOM;
dev->netdev_ops = &vxlan_netdev_ops;
dev->destructor = free_netdev;
SET_NETDEV_DEVTYPE(dev, &vxlan_type);
dev->tx_queue_len = 0;
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->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
dev->hw_features |= NETIF_F_GSO_SOFTWARE;
dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
netif_keep_dst(dev);
dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
INIT_LIST_HEAD(&vxlan->next);
spin_lock_init(&vxlan->hash_lock);
INIT_WORK(&vxlan->igmp_join, vxlan_igmp_join);
INIT_WORK(&vxlan->igmp_leave, vxlan_igmp_leave);
INIT_WORK(&vxlan->sock_work, vxlan_sock_work);
init_timer_deferrable(&vxlan->age_timer);
vxlan->age_timer.function = vxlan_cleanup;
vxlan->age_timer.data = (unsigned long) vxlan;
vxlan->dst_port = htons(vxlan_port);
vxlan->dev = dev;
for (h = 0; h < FDB_HASH_SIZE; ++h)
INIT_HLIST_HEAD(&vxlan->fdb_head[h]);
}
static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
[IFLA_VXLAN_ID] = { .type = NLA_U32 },
[IFLA_VXLAN_GROUP] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
[IFLA_VXLAN_GROUP6] = { .len = sizeof(struct in6_addr) },
[IFLA_VXLAN_LINK] = { .type = NLA_U32 },
[IFLA_VXLAN_LOCAL] = { .len = FIELD_SIZEOF(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_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_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_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG },
};
static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
{
if (tb[IFLA_ADDRESS]) {
if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
pr_debug("invalid link address (not ethernet)\n");
return -EINVAL;
}
if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
pr_debug("invalid all zero ethernet address\n");
return -EADDRNOTAVAIL;
}
}
if (!data)
return -EINVAL;
if (data[IFLA_VXLAN_ID]) {
__u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
if (id >= VXLAN_VID_MASK)
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)) {
pr_debug("port range %u .. %u not valid\n",
ntohs(p->low), ntohs(p->high));
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 const struct ethtool_ops vxlan_ethtool_ops = {
.get_drvinfo = vxlan_get_drvinfo,
.get_link = ethtool_op_get_link,
};
static void vxlan_del_work(struct work_struct *work)
{
struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
udp_tunnel_sock_release(vs->sock);
kfree_rcu(vs, rcu);
}
static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
__be16 port, u32 flags)
{
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);
} else {
udp_conf.family = AF_INET;
udp_conf.local_ip.s_addr = INADDR_ANY;
}
udp_conf.local_udp_port = port;
/* 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, __be16 port,
vxlan_rcv_t *rcv, void *data,
u32 flags)
{
struct vxlan_net *vn = net_generic(net, vxlan_net_id);
struct vxlan_sock *vs;
struct socket *sock;
unsigned int h;
bool ipv6 = !!(flags & VXLAN_F_IPV6);
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]);
INIT_WORK(&vs->del_work, vxlan_del_work);
sock = vxlan_create_sock(net, ipv6, port, flags);
if (IS_ERR(sock)) {
kfree(vs);
return ERR_CAST(sock);
}
vs->sock = sock;
atomic_set(&vs->refcnt, 1);
vs->rcv = rcv;
vs->data = data;
vs->flags = (flags & VXLAN_F_RCV_FLAGS);
/* Initialize the vxlan udp offloads structure */
vs->udp_offloads.port = port;
vs->udp_offloads.callbacks.gro_receive = vxlan_gro_receive;
vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
spin_lock(&vn->sock_lock);
hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
vxlan_notify_add_rx_port(vs);
spin_unlock(&vn->sock_lock);
/* Mark socket as an encapsulation socket. */
tunnel_cfg.sk_user_data = vs;
tunnel_cfg.encap_type = 1;
tunnel_cfg.encap_rcv = vxlan_udp_encap_recv;
tunnel_cfg.encap_destroy = NULL;
setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
return vs;
}
struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
vxlan_rcv_t *rcv, void *data,
bool no_share, u32 flags)
{
struct vxlan_net *vn = net_generic(net, vxlan_net_id);
struct vxlan_sock *vs;
bool ipv6 = flags & VXLAN_F_IPV6;
vs = vxlan_socket_create(net, port, rcv, data, flags);
if (!IS_ERR(vs))
return vs;
if (no_share) /* Return error if sharing is not allowed. */
return vs;
spin_lock(&vn->sock_lock);
vs = vxlan_find_sock(net, ipv6 ? AF_INET6 : AF_INET, port, flags);
if (vs && ((vs->rcv != rcv) ||
!atomic_add_unless(&vs->refcnt, 1, 0)))
vs = ERR_PTR(-EBUSY);
spin_unlock(&vn->sock_lock);
if (!vs)
vs = ERR_PTR(-EINVAL);
return vs;
}
EXPORT_SYMBOL_GPL(vxlan_sock_add);
/* Scheduled at device creation to bind to a socket */
static void vxlan_sock_work(struct work_struct *work)
{
struct vxlan_dev *vxlan = container_of(work, struct vxlan_dev, sock_work);
struct net *net = vxlan->net;
struct vxlan_net *vn = net_generic(net, vxlan_net_id);
__be16 port = vxlan->dst_port;
struct vxlan_sock *nvs;
nvs = vxlan_sock_add(net, port, vxlan_rcv, NULL, false, vxlan->flags);
spin_lock(&vn->sock_lock);
if (!IS_ERR(nvs))
vxlan_vs_add_dev(nvs, vxlan);
spin_unlock(&vn->sock_lock);
dev_put(vxlan->dev);
}
static int vxlan_newlink(struct net *src_net, struct net_device *dev,
struct nlattr *tb[], struct nlattr *data[])
{
struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
struct vxlan_dev *vxlan = netdev_priv(dev);
struct vxlan_rdst *dst = &vxlan->default_dst;
__u32 vni;
int err;
bool use_ipv6 = false;
if (!data[IFLA_VXLAN_ID])
return -EINVAL;
vxlan->net = src_net;
vni = nla_get_u32(data[IFLA_VXLAN_ID]);
dst->remote_vni = vni;
/* Unless IPv6 is explicitly requested, assume IPv4 */
dst->remote_ip.sa.sa_family = AF_INET;
if (data[IFLA_VXLAN_GROUP]) {
dst->remote_ip.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_GROUP]);
} else if (data[IFLA_VXLAN_GROUP6]) {
if (!IS_ENABLED(CONFIG_IPV6))
return -EPFNOSUPPORT;
nla_memcpy(&dst->remote_ip.sin6.sin6_addr, data[IFLA_VXLAN_GROUP6],
sizeof(struct in6_addr));
dst->remote_ip.sa.sa_family = AF_INET6;
use_ipv6 = true;
}
if (data[IFLA_VXLAN_LOCAL]) {
vxlan->saddr.sin.sin_addr.s_addr = nla_get_be32(data[IFLA_VXLAN_LOCAL]);
vxlan->saddr.sa.sa_family = AF_INET;
} else if (data[IFLA_VXLAN_LOCAL6]) {
if (!IS_ENABLED(CONFIG_IPV6))
return -EPFNOSUPPORT;
/* TODO: respect scope id */
nla_memcpy(&vxlan->saddr.sin6.sin6_addr, data[IFLA_VXLAN_LOCAL6],
sizeof(struct in6_addr));
vxlan->saddr.sa.sa_family = AF_INET6;
use_ipv6 = true;
}
if (data[IFLA_VXLAN_LINK] &&
(dst->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]))) {
struct net_device *lowerdev
= __dev_get_by_index(src_net, dst->remote_ifindex);
if (!lowerdev) {
pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
return -ENODEV;
}
#if IS_ENABLED(CONFIG_IPV6)
if (use_ipv6) {
struct inet6_dev *idev = __in6_dev_get(lowerdev);
if (idev && idev->cnf.disable_ipv6) {
pr_info("IPv6 is disabled via sysctl\n");
return -EPERM;
}
vxlan->flags |= VXLAN_F_IPV6;
}
#endif
if (!tb[IFLA_MTU])
dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
dev->needed_headroom = lowerdev->hard_header_len +
(use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
} else if (use_ipv6)
vxlan->flags |= VXLAN_F_IPV6;
if (data[IFLA_VXLAN_TOS])
vxlan->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
if (data[IFLA_VXLAN_TTL])
vxlan->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
vxlan->flags |= VXLAN_F_LEARN;
if (data[IFLA_VXLAN_AGEING])
vxlan->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
else
vxlan->age_interval = FDB_AGE_DEFAULT;
if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
vxlan->flags |= VXLAN_F_PROXY;
if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
vxlan->flags |= VXLAN_F_RSC;
if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
vxlan->flags |= VXLAN_F_L2MISS;
if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
vxlan->flags |= VXLAN_F_L3MISS;
if (data[IFLA_VXLAN_LIMIT])
vxlan->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
if (data[IFLA_VXLAN_PORT_RANGE]) {
const struct ifla_vxlan_port_range *p
= nla_data(data[IFLA_VXLAN_PORT_RANGE]);
vxlan->port_min = ntohs(p->low);
vxlan->port_max = ntohs(p->high);
}
if (data[IFLA_VXLAN_PORT])
vxlan->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
if (data[IFLA_VXLAN_UDP_CSUM] && nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
vxlan->flags |= VXLAN_F_UDP_CSUM;
if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
vxlan->flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
vxlan->flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
if (data[IFLA_VXLAN_REMCSUM_TX] &&
nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
vxlan->flags |= VXLAN_F_REMCSUM_TX;
if (data[IFLA_VXLAN_REMCSUM_RX] &&
nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
vxlan->flags |= VXLAN_F_REMCSUM_RX;
if (data[IFLA_VXLAN_GBP])
vxlan->flags |= VXLAN_F_GBP;
if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL])
vxlan->flags |= VXLAN_F_REMCSUM_NOPARTIAL;
if (vxlan_find_vni(src_net, vni, use_ipv6 ? AF_INET6 : AF_INET,
vxlan->dst_port, vxlan->flags)) {
pr_info("duplicate VNI %u\n", vni);
return -EEXIST;
}
dev->ethtool_ops = &vxlan_ethtool_ops;
/* create an fdb entry for a valid default destination */
if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
err = vxlan_fdb_create(vxlan, all_zeros_mac,
&vxlan->default_dst.remote_ip,
NUD_REACHABLE|NUD_PERMANENT,
NLM_F_EXCL|NLM_F_CREATE,
vxlan->dst_port,
vxlan->default_dst.remote_vni,
vxlan->default_dst.remote_ifindex,
NTF_SELF);
if (err)
return err;
}
err = register_netdevice(dev);
if (err) {
vxlan_fdb_delete_default(vxlan);
return err;
}
list_add(&vxlan->next, &vn->vxlan_list);
return 0;
}
static void vxlan_dellink(struct net_device *dev, struct list_head *head)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
spin_lock(&vn->sock_lock);
if (!hlist_unhashed(&vxlan->hlist))
hlist_del_rcu(&vxlan->hlist);
spin_unlock(&vn->sock_lock);
list_del(&vxlan->next);
unregister_netdevice_queue(dev, head);
}
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_TOS */
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(__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->port_min),
.high = htons(vxlan->port_max),
};
if (nla_put_u32(skb, IFLA_VXLAN_ID, 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_be32(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(skb, IFLA_VXLAN_GROUP6, sizeof(struct in6_addr),
&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->saddr)) {
if (vxlan->saddr.sa.sa_family == AF_INET) {
if (nla_put_be32(skb, IFLA_VXLAN_LOCAL,
vxlan->saddr.sin.sin_addr.s_addr))
goto nla_put_failure;
#if IS_ENABLED(CONFIG_IPV6)
} else {
if (nla_put(skb, IFLA_VXLAN_LOCAL6, sizeof(struct in6_addr),
&vxlan->saddr.sin6.sin6_addr))
goto nla_put_failure;
#endif
}
}
if (nla_put_u8(skb, IFLA_VXLAN_TTL, vxlan->ttl) ||
nla_put_u8(skb, IFLA_VXLAN_TOS, vxlan->tos) ||
nla_put_u8(skb, IFLA_VXLAN_LEARNING,
!!(vxlan->flags & VXLAN_F_LEARN)) ||
nla_put_u8(skb, IFLA_VXLAN_PROXY,
!!(vxlan->flags & VXLAN_F_PROXY)) ||
nla_put_u8(skb, IFLA_VXLAN_RSC, !!(vxlan->flags & VXLAN_F_RSC)) ||
nla_put_u8(skb, IFLA_VXLAN_L2MISS,
!!(vxlan->flags & VXLAN_F_L2MISS)) ||
nla_put_u8(skb, IFLA_VXLAN_L3MISS,
!!(vxlan->flags & VXLAN_F_L3MISS)) ||
nla_put_u32(skb, IFLA_VXLAN_AGEING, vxlan->age_interval) ||
nla_put_u32(skb, IFLA_VXLAN_LIMIT, vxlan->addrmax) ||
nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->dst_port) ||
nla_put_u8(skb, IFLA_VXLAN_UDP_CSUM,
!!(vxlan->flags & VXLAN_F_UDP_CSUM)) ||
nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
!!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_TX)) ||
nla_put_u8(skb, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
!!(vxlan->flags & VXLAN_F_UDP_ZERO_CSUM6_RX)) ||
nla_put_u8(skb, IFLA_VXLAN_REMCSUM_TX,
!!(vxlan->flags & VXLAN_F_REMCSUM_TX)) ||
nla_put_u8(skb, IFLA_VXLAN_REMCSUM_RX,
!!(vxlan->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->flags & VXLAN_F_GBP &&
nla_put_flag(skb, IFLA_VXLAN_GBP))
goto nla_put_failure;
if (vxlan->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,
.dellink = vxlan_dellink,
.get_size = vxlan_get_size,
.fill_info = vxlan_fill_info,
.get_link_net = vxlan_get_link_net,
};
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_lowerdev_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)
vxlan_handle_lowerdev_unregister(vn, dev);
return NOTIFY_DONE;
}
static struct notifier_block vxlan_notifier_block __read_mostly = {
.notifier_call = vxlan_lowerdev_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 0;
}
static void __net_exit vxlan_exit_net(struct net *net)
{
struct vxlan_net *vn = net_generic(net, vxlan_net_id);
struct vxlan_dev *vxlan, *next;
struct net_device *dev, *aux;
LIST_HEAD(list);
rtnl_lock();
for_each_netdev_safe(net, dev, aux)
if (dev->rtnl_link_ops == &vxlan_link_ops)
unregister_netdevice_queue(dev, &list);
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(dev, &list);
}
unregister_netdevice_many(&list);
rtnl_unlock();
}
static struct pernet_operations vxlan_net_ops = {
.init = vxlan_init_net,
.exit = vxlan_exit_net,
.id = &vxlan_net_id,
.size = sizeof(struct vxlan_net),
};
static int __init vxlan_init_module(void)
{
int rc;
vxlan_wq = alloc_workqueue("vxlan", 0, 0);
if (!vxlan_wq)
return -ENOMEM;
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 = rtnl_link_register(&vxlan_link_ops);
if (rc)
goto out3;
return 0;
out3:
unregister_netdevice_notifier(&vxlan_notifier_block);
out2:
unregister_pernet_subsys(&vxlan_net_ops);
out1:
destroy_workqueue(vxlan_wq);
return rc;
}
late_initcall(vxlan_init_module);
static void __exit vxlan_cleanup_module(void)
{
rtnl_link_unregister(&vxlan_link_ops);
unregister_netdevice_notifier(&vxlan_notifier_block);
destroy_workqueue(vxlan_wq);
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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