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vxlan.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/gro.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;
struct notifier_block nexthop_notifier_block;
};
/* 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, UDP port,
* enabled unshareable flags and socket device binding (see l3mdev with
* non-default VRF).
*/
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);