/*
- * Copyright (c) 2007-2013 Nicira, Inc.
+ * VXLAN: Virtual eXtensible Local Area Network
*
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of version 2 of the GNU General Public
- * License as published by the Free Software Foundation.
+ * Copyright (c) 2012-2013 Vyatta Inc.
*
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301, USA
- *
- * This code is derived from kernel vxlan module.
+ * 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.
*/
-#include <linux/version.h>
-
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/kernel.h>
#include <linux/if_vlan.h>
#include <linux/hash.h>
#include <linux/ethtool.h>
+#include <linux/netdev_features.h>
#include <net/arp.h>
#include <net/ndisc.h>
#include <net/ip.h>
-#include <net/gre.h>
#include <net/ip_tunnels.h>
#include <net/icmp.h>
#include <net/udp.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
#include <net/vxlan.h>
+#include <net/protocol.h>
+#include <net/udp_tunnel.h>
+#include <net/ip6_route.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
+#include <net/dst_metadata.h>
-#include "compat.h"
-#include "datapath.h"
+#ifndef HAVE_METADATA_DST
#include "gso.h"
-#include "vlan.h"
+#include "vport-netdev.h"
+
+#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 */
+
+#ifndef NTF_SELF
+#define NTF_SELF 0x02
+#endif
+
+/* 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 int vxlan_net_id;
+static struct rtnl_link_ops vxlan_link_ops;
-#ifndef USE_UPSTREAM_VXLAN
+static const u8 all_zeros_mac[ETH_ALEN];
-/* VXLAN protocol header */
-struct vxlanhdr {
- __be32 vx_flags;
- __be32 vx_vni;
+static struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
+ bool no_share, u32 flags);
+
+/* 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;
};
-/* Callback from net/ipv4/udp.c to receive packets */
-static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
+/* 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 */
+ u8 flags; /* see ndm_flags */
+};
+
+/* salt for hash table */
+static u32 vxlan_salt __read_mostly;
+static struct workqueue_struct *vxlan_wq;
+
+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 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));
+}
+
+#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));
+}
+
+#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;
- 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;
+ flags &= VXLAN_F_RCV_FLAGS;
- vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
- flags = ntohl(vxh->vx_flags);
- vni = ntohl(vxh->vx_vni);
+ hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
+ if (inet_sport(vs->sock->sk) == port &&
+ vxlan_get_sk_family(vs) == family &&
+ vs->flags == flags)
+ return vs;
+ }
+ return NULL;
+}
- if (flags & VXLAN_HF_VNI) {
- flags &= ~VXLAN_HF_VNI;
- } else {
- /* VNI flag always required to be set */
- goto bad_flags;
+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;
}
- if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
- goto drop;
+ return NULL;
+}
- vs = rcu_dereference_sk_user_data(sk);
+/* 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)
- goto drop;
+ return NULL;
- /* 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;
+ return vxlan_vs_find_vni(vs, id);
+}
- gbp = (struct vxlanhdr_gbp *)vxh;
- md.gbp = ntohs(gbp->policy_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)
+{
+ return -EINVAL;
+}
- if (gbp->dont_learn)
- md.gbp |= VXLAN_GBP_DONT_LEARN;
+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));
+}
- if (gbp->policy_applied)
- md.gbp |= VXLAN_GBP_POLICY_APPLIED;
+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;
- flags &= ~VXLAN_GBP_USED_BITS;
+ 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;
}
- if (flags || (vni & 0xff)) {
- /* 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.
- */
+ rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
+ return;
+errout:
+ if (err < 0)
+ rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
+}
- goto bad_flags;
+/* 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;
}
- md.vni = vxh->vx_vni;
- vs->rcv(vs, skb, &md);
- return 0;
+ return NULL;
+}
-drop:
- /* Consume bad packet */
- kfree_skb(skb);
- return 0;
-bad_flags:
- pr_debug("invalid vxlan flags=%#x vni=%#x\n",
- ntohl(vxh->vx_flags), ntohl(vxh->vx_vni));
+static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
+ const u8 *mac)
+{
+ struct vxlan_fdb *f;
-error:
- /* Return non vxlan pkt */
- return 1;
+ f = __vxlan_find_mac(vxlan, mac);
+ if (f)
+ f->used = jiffies;
+
+ return f;
}
-static void vxlan_sock_put(struct sk_buff *skb)
+/* 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)
{
- sock_put(skb->sk);
+ 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;
}
-/* On transmit, associate with the tunnel socket */
-static void vxlan_set_owner(struct sock *sk, struct sk_buff *skb)
+/* Replace destination of unicast mac */
+static int vxlan_fdb_replace(struct vxlan_fdb *f,
+ union vxlan_addr *ip, __be16 port, __u32 vni, __u32 ifindex)
{
- skb_orphan(skb);
- sock_hold(sk);
- skb->sk = sk;
- skb->destructor = vxlan_sock_put;
+ 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;
}
-static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
- struct vxlan_metadata *md)
+/* 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 vxlanhdr_gbp *gbp;
+ struct vxlan_rdst *rd;
- if (!md->gbp)
- return;
+ rd = vxlan_fdb_find_rdst(f, ip, port, vni, ifindex);
+ if (rd)
+ return 0;
- gbp = (struct vxlanhdr_gbp *)vxh;
- vxh->vx_flags |= htonl(VXLAN_HF_GBP);
+ 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;
- if (md->gbp & VXLAN_GBP_DONT_LEARN)
- gbp->dont_learn = 1;
+ list_add_tail_rcu(&rd->list, &f->remotes);
- if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
- gbp->policy_applied = 1;
+ *rdp = rd;
+ return 1;
+}
- gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
+#ifdef HAVE_UDP_OFFLOAD
+#ifdef HAVE_NETIF_F_GSO_TUNNEL_REMCSUM
+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;
+
+ if (skb->remcsum_offload)
+ return vh;
+
+ 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));
+
+ vh = skb_gro_remcsum_process(skb, (void *)vh, off, hdrlen,
+ start, offset, grc, nopartial);
+
+ skb->remcsum_offload = 1;
+
+ return vh;
+}
+#else
+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)
+{
+ return NULL;
}
+#endif
-int rpl_vxlan_xmit_skb(struct rtable *rt, struct sock *sk, 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)
+#ifndef HAVE_UDP_OFFLOAD_ARG_UOFF
+static struct sk_buff **vxlan_gro_receive(struct sk_buff **head,
+ struct sk_buff *skb)
+#else
+static struct sk_buff **vxlan_gro_receive(struct sk_buff **head,
+ struct sk_buff *skb,
+ struct udp_offload *uoff)
+#endif
{
- struct vxlanhdr *vxh;
- int min_headroom;
- int err;
- bool udp_sum = !!(vxflags & VXLAN_F_UDP_CSUM);
+#ifdef HAVE_UDP_OFFLOAD_ARG_UOFF
+ struct vxlan_sock *vs = container_of(uoff, struct vxlan_sock,
+ udp_offloads);
+#else
+ struct vxlan_sock *vs = NULL;
+#endif
+ struct sk_buff *p, **pp = NULL;
+ struct vxlanhdr *vh, *vh2;
+ unsigned int hlen, off_vx;
+ int flush = 1;
+ u32 flags;
+ struct gro_remcsum grc;
- min_headroom = LL_RESERVED_SPACE(rt_dst(rt).dev) + rt_dst(rt).header_len
- + VXLAN_HLEN + sizeof(struct iphdr)
- + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
+ skb_gro_remcsum_init(&grc);
- /* Need space for new headers (invalidates iph ptr) */
- err = skb_cow_head(skb, min_headroom);
- if (unlikely(err)) {
- kfree_skb(skb);
- return err;
+ 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 = vlan_hwaccel_push_inside(skb);
- if (WARN_ON(!skb))
- return -ENOMEM;
+ skb_gro_postpull_rcsum(skb, vh, sizeof(struct vxlanhdr));
- skb = udp_tunnel_handle_offloads(skb, udp_sum, true);
- if (IS_ERR(skb))
- return PTR_ERR(skb);
+ flags = ntohl(vh->vx_flags);
- vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
- vxh->vx_flags = htonl(VXLAN_HF_VNI);
- vxh->vx_vni = md->vni;
+ if ((flags & VXLAN_HF_RCO) && vs && (vs->flags & VXLAN_F_REMCSUM_RX)) {
- if (vxflags & VXLAN_F_GBP)
- vxlan_build_gbp_hdr(vxh, vxflags, md);
+ vh = vxlan_gro_remcsum(skb, off_vx, vh, sizeof(struct vxlanhdr),
+ ntohl(vh->vx_vni), &grc,
+ !!(vs->flags &
+ VXLAN_F_REMCSUM_NOPARTIAL));
- vxlan_set_owner(sk, skb);
+ if (!vh)
+ goto out;
+ }
- ovs_skb_set_inner_protocol(skb, htons(ETH_P_TEB));
+ skb_gro_pull(skb, sizeof(struct vxlanhdr)); /* pull vxlan header */
- return udp_tunnel_xmit_skb(rt, sk, skb, src, dst, tos,
- ttl, df, src_port, dst_port, xnet,
- !udp_sum);
-}
-EXPORT_SYMBOL_GPL(rpl_vxlan_xmit_skb);
+ flush = 0;
-static void rcu_free_vs(struct rcu_head *rcu)
-{
- struct vxlan_sock *vs = container_of(rcu, struct vxlan_sock, rcu);
+ for (p = *head; p; p = p->next) {
+ if (!NAPI_GRO_CB(p)->same_flow)
+ continue;
- kfree(vs);
+ 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 void vxlan_del_work(struct work_struct *work)
+#ifndef HAVE_UDP_OFFLOAD_ARG_UOFF
+static int vxlan_gro_complete(struct sk_buff *skb, int nhoff)
+#else
+static int vxlan_gro_complete(struct sk_buff *skb, int nhoff,
+ struct udp_offload *uoff)
+#endif
{
- struct vxlan_sock *vs = container_of(work, struct vxlan_sock, del_work);
+ udp_tunnel_gro_complete(skb, nhoff);
- udp_tunnel_sock_release(vs->sock);
- call_rcu(&vs->rcu, rcu_free_vs);
+ return eth_gro_complete(skb, nhoff + sizeof(struct vxlanhdr));
}
-static struct socket *vxlan_create_sock(struct net *net, bool ipv6,
- __be16 port, u32 flags)
+/* Notify netdevs that UDP port started listening */
+static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
{
- struct socket *sock;
- struct udp_port_cfg udp_conf;
+ struct net_device *dev;
+ struct sock *sk = vs->sock->sk;
+ struct net *net = sock_net(sk);
+ sa_family_t sa_family = vxlan_get_sk_family(vs);
+ __be16 port = inet_sk(sk)->inet_sport;
int err;
- memset(&udp_conf, 0, sizeof(udp_conf));
+ 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);
+ }
- if (ipv6) {
- udp_conf.family = AF_INET6;
- /* The checksum flag is silently ignored but it
- * doesn't make sense here anyways because OVS enables
- * checksums on a finer granularity than per-socket.
- */
- } else {
- udp_conf.family = AF_INET;
- udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
+ 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();
+}
- udp_conf.local_udp_port = port;
+/* 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 = vxlan_get_sk_family(vs);
+ __be16 port = inet_sk(sk)->inet_sport;
- /* Open UDP socket */
- err = udp_sock_create(net, &udp_conf, &sock);
- if (err < 0)
- return ERR_PTR(err);
+ 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();
- return sock;
+ if (sa_family == AF_INET)
+ udp_del_offload(&vs->udp_offloads);
}
+#endif
-static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port,
- vxlan_rcv_t *rcv, void *data, u32 flags)
+/* 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_sock *vs;
- struct socket *sock;
- struct udp_tunnel_sock_cfg tunnel_cfg;
+ struct vxlan_rdst *rd = NULL;
+ struct vxlan_fdb *f;
+ int notify = 0;
- vs = kmalloc(sizeof(*vs), GFP_KERNEL);
- if (!vs) {
- pr_debug("memory alocation failure\n");
- return ERR_PTR(-ENOMEM);
- }
+ 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))) {
+ notify |= vxlan_fdb_replace(f, ip, port, vni,
+ ifindex);
+ } 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);
- INIT_WORK(&vs->del_work, vxlan_del_work);
+ if (rc < 0)
+ return rc;
+ notify |= rc;
+ }
+ } else {
+ if (!(flags & NLM_F_CREATE))
+ return -ENOENT;
- sock = vxlan_create_sock(net, false, port, flags);
- if (IS_ERR(sock)) {
- kfree(vs);
- return ERR_CAST(sock);
+ if (vxlan->cfg.addrmax &&
+ vxlan->addrcnt >= vxlan->cfg.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));
}
- vs->sock = sock;
- vs->rcv = rcv;
- vs->data = data;
- vs->flags = (flags & VXLAN_F_RCV_FLAGS);
+ if (notify) {
+ if (rd == NULL)
+ rd = first_remote_rtnl(f);
+ vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH);
+ }
- tunnel_cfg.sk_user_data = vs;
- tunnel_cfg.encap_type = 1;
- tunnel_cfg.encap_rcv = vxlan_udp_encap_recv;
- tunnel_cfg.encap_destroy = NULL;
+ return 0;
+}
- setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
+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;
- return vs;
+ list_for_each_entry_safe(rd, nd, &f->remotes, list)
+ kfree(rd);
+ kfree(f);
}
-struct vxlan_sock *rpl_vxlan_sock_add(struct net *net, __be16 port,
- vxlan_rcv_t *rcv, void *data,
- bool no_share, u32 flags)
+static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f)
{
- return vxlan_socket_create(net, port, rcv, data, flags);
+ 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);
+}
+
+/* Watch incoming packets to learn mapping between Ethernet address
+ * and Tunnel endpoint.
+ * Return true if packet is bogus and should be dropped.
+ */
+static bool vxlan_snoop(struct net_device *dev,
+ union vxlan_addr *src_ip, const u8 *src_mac)
+{
+ 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->cfg.dst_port,
+ vxlan->default_dst.remote_vni,
+ 0, NTF_SELF);
+ spin_unlock(&vxlan->hash_lock);
+ }
+
+ return false;
}
-EXPORT_SYMBOL_GPL(rpl_vxlan_sock_add);
-void rpl_vxlan_sock_release(struct vxlan_sock *vs)
+/* See if multicast group is already in use by other ID */
+static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev)
{
- ASSERT_OVSL();
+ 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;
- queue_work(system_wq, &vs->del_work);
+ 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;
}
-EXPORT_SYMBOL_GPL(rpl_vxlan_sock_release);
-#endif /* !USE_UPSTREAM_VXLAN */
+static 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);
+#ifdef HAVE_UDP_OFFLOAD
+ vxlan_notify_del_rx_port(vs);
+#endif
+ spin_unlock(&vn->sock_lock);
+
+ queue_work(vxlan_wq, &vs->del_work);
+}
+
+/* Update multicast group membership when first VNI on
+ * multicast address is brought up
+ */
+static int vxlan_igmp_join(struct vxlan_dev *vxlan)
+{
+ return -EINVAL;
+}
+
+/* Inverse of vxlan_igmp_join when last VNI is brought down */
+static int vxlan_igmp_leave(struct vxlan_dev *vxlan)
+{
+ return -EINVAL;
+}
+
+#ifdef HAVE_VXLAN_HF_RCO
+static struct vxlanhdr *vxlan_remcsum(struct sk_buff *skb, struct vxlanhdr *vh,
+ size_t hdrlen, u32 data, bool nopartial)
+{
+ size_t start, offset, plen;
+
+ if (skb->remcsum_offload)
+ return vh;
+
+ 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;
+}
+#endif
+
+static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb,
+ struct vxlan_metadata *md, u32 vni,
+ struct metadata_dst *tun_dst)
+{
+ struct iphdr *oip = NULL;
+ struct ipv6hdr *oip6 = NULL;
+ struct vxlan_dev *vxlan;
+#ifdef HAVE_DEV_TSTATS
+ struct pcpu_sw_netstats *stats;
+#endif
+ union vxlan_addr saddr;
+ int err = 0;
+ union vxlan_addr *remote_ip;
+
+ /* For flow based devices, map all packets to VNI 0 */
+ if (vs->flags & VXLAN_F_COLLECT_METADATA)
+ vni = 0;
+
+ /* 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 (tun_dst) {
+ ovs_skb_dst_set(skb, (struct dst_entry *)tun_dst);
+ tun_dst = NULL;
+ } else {
+ goto drop;
+ }
+
+ if ((vxlan->flags & VXLAN_F_LEARN) &&
+ vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
+ goto drop;
+
+ skb_reset_network_header(skb);
+ /* In flow-based mode, GBP is carried in dst_metadata */
+ if (!(vs->flags & VXLAN_F_COLLECT_METADATA))
+ skb->mark = md->gbp;
+
+ if (oip6)
+ err = IP6_ECN_decapsulate(oip6, skb);
+ if (oip)
+ err = IP_ECN_decapsulate(oip, skb);
+
+ if (unlikely(err)) {
+ if (err > 1) {
+ ++vxlan->dev->stats.rx_frame_errors;
+ ++vxlan->dev->stats.rx_errors;
+ goto drop;
+ }
+ }
+
+#ifdef HAVE_DEV_TSTATS
+ stats = this_cpu_ptr((struct pcpu_sw_netstats __percpu *)vxlan->dev->tstats);
+ u64_stats_update_begin(&stats->syncp);
+ stats->rx_packets++;
+ stats->rx_bytes += skb->len;
+ u64_stats_update_end(&stats->syncp);
+#endif
+ netdev_port_receive(skb, skb_tunnel_info(skb));
+ return;
+drop:
+
+ /* Consume bad packet */
+ kfree_skb(skb);
+}
+
+/* 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;
+ struct vxlan_metadata *md = &_md;
+ union {
+ struct metadata_dst dst;
+ char buf[sizeof(struct metadata_dst) + sizeof(*md)];
+ } buf;
+
+ /* 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;
+
+#ifdef HAVE_VXLAN_HF_RCO
+ 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;
+ }
+#endif
+
+ if (vxlan_collect_metadata(vs)) {
+ ovs_udp_tun_rx_dst(&buf.dst.u.tun_info, skb, AF_INET, TUNNEL_KEY,
+ cpu_to_be64(vni >> 8), sizeof(*md));
+
+ md = ip_tunnel_info_opts(&buf.dst.u.tun_info);
+ } else {
+ memset(md, 0, sizeof(*md));
+ }
+
+ /* 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);
+
+ buf.dst.u.tun_info.key.tun_flags |= TUNNEL_VXLAN_OPT;
+
+ 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 compatibility with previous stack code, and also
+ * is more robust and provides a little more security in
+ * adding extensions to VXLAN.
+ */
+
+ goto bad_flags;
+ }
+
+ vxlan_rcv(vs, skb, md, vni >> 8, &buf.dst);
+ 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_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 sock *sk,
+ 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, __be32 vni,
+ 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 = 0;
+
+ 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;
+ /* Add support for remote csum. */
+ if (!SKB_GSO_TUNNEL_REMCSUM) {
+ kfree_skb(skb);
+ err = -EOPNOTSUPP;
+ 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;
+ }
+
+ skb = udp_tunnel_handle_offloads(skb, udp_sum, type, true);
+ if (IS_ERR(skb)) {
+ err = -EINVAL;
+ goto err;
+ }
+
+ vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
+ vxh->vx_flags = htonl(VXLAN_HF_VNI);
+ vxh->vx_vni = vni;
+
+ if (type & SKB_GSO_TUNNEL_REMCSUM) {
+ u16 hdrlen = sizeof(struct vxlanhdr);
+ 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;
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0)
+ skb->encapsulation = 0;
+#endif
+ }
+ }
+
+ if (vxflags & VXLAN_F_GBP)
+ vxlan_build_gbp_hdr(vxh, vxflags, md);
+
+ ovs_skb_set_inner_protocol(skb, htons(ETH_P_TEB));
+
+ udp_tunnel6_xmit_skb(dst, sk, 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
+
+static int vxlan_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
+ __be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
+ __be16 src_port, __be16 dst_port, __be32 vni,
+ 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 = 0;
+
+ 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;
+
+ if (!SKB_GSO_TUNNEL_REMCSUM) {
+ kfree_skb(skb);
+ return -EOPNOTSUPP;
+ }
+ }
+ }
+
+ min_headroom = LL_RESERVED_SPACE(rt_dst(rt).dev) + rt_dst(rt).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;
+
+ skb = udp_tunnel_handle_offloads(skb, udp_sum, type, true);
+ if (IS_ERR(skb))
+ return PTR_ERR(skb);
+
+ vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
+ vxh->vx_flags = htonl(VXLAN_HF_VNI);
+ vxh->vx_vni = vni;
+
+ if (type & SKB_GSO_TUNNEL_REMCSUM) {
+ u16 hdrlen = sizeof(struct vxlanhdr);
+ 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;
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0)
+ skb->encapsulation = 0;
+#endif
+ }
+ }
+ if (vxflags & VXLAN_F_GBP)
+ vxlan_build_gbp_hdr(vxh, vxflags, md);
+
+ ovs_skb_set_inner_protocol(skb, htons(ETH_P_TEB));
+
+ return udp_tunnel_xmit_skb(rt, sk, skb, src, dst, tos,
+ ttl, df, src_port, dst_port, xnet,
+ !(vxflags & VXLAN_F_UDP_CSUM));
+}
+
+static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
+ struct vxlan_rdst *rdst, bool did_rsc)
+{
+ struct ip_tunnel_info *info;
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ struct sock *sk = vxlan->vn_sock->sock->sk;
+ unsigned short family = vxlan_get_sk_family(vxlan->vn_sock);
+ struct rtable *rt = NULL;
+ const struct iphdr *old_iph;
+ struct flowi4 fl4;
+ union vxlan_addr *dst;
+ union vxlan_addr remote_ip;
+ struct vxlan_metadata _md;
+ struct vxlan_metadata *md = &_md;
+ __be16 src_port = 0, dst_port;
+ u32 vni;
+ __be16 df = 0;
+ __u8 tos, ttl;
+ int err;
+ u32 flags = vxlan->flags;
+
+ info = skb_tunnel_info(skb);
+
+ if (rdst) {
+ dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
+ vni = rdst->remote_vni;
+ dst = &rdst->remote_ip;
+ } else {
+ if (!info) {
+ WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
+ dev->name);
+ goto drop;
+ }
+ if (family != ip_tunnel_info_af(info))
+ goto drop;
+
+ dst_port = info->key.tp_dst ? : vxlan->cfg.dst_port;
+ vni = be64_to_cpu(info->key.tun_id);
+ remote_ip.sa.sa_family = family;
+ if (family == AF_INET)
+ remote_ip.sin.sin_addr.s_addr = info->key.u.ipv4.dst;
+ else
+ remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
+ dst = &remote_ip;
+ }
+
+ if (vxlan_addr_any(dst)) {
+ if (did_rsc) {
+ /* short-circuited back to local bridge */
+ WARN_ONCE(1, "%s: vxlan_encap_bypass not supported\n",
+ dev->name);
+ }
+ goto drop;
+ }
+
+ old_iph = ip_hdr(skb);
+
+ ttl = vxlan->cfg.ttl;
+ if (!ttl && vxlan_addr_multicast(dst))
+ ttl = 1;
+
+ tos = vxlan->cfg.tos;
+ if (tos == 1)
+ tos = ip_tunnel_get_dsfield(old_iph, skb);
+
+ src_port = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
+ vxlan->cfg.port_max, true);
+
+ if (info) {
+ if (info->key.tun_flags & TUNNEL_CSUM)
+ flags |= VXLAN_F_UDP_CSUM;
+ else
+ flags &= ~VXLAN_F_UDP_CSUM;
+
+ ttl = info->key.ttl;
+ tos = info->key.tos;
+
+ if (info->options_len)
+ md = ip_tunnel_info_opts(info);
+ } else {
+ md->gbp = skb->mark;
+ }
+
+ if (dst->sa.sa_family == AF_INET) {
+ if (info && (info->key.tun_flags & TUNNEL_DONT_FRAGMENT))
+ df = htons(IP_DF);
+
+ memset(&fl4, 0, sizeof(fl4));
+ fl4.flowi4_oif = rdst ? rdst->remote_ifindex : 0;
+ fl4.flowi4_tos = RT_TOS(tos);
+ fl4.flowi4_mark = skb->mark;
+ fl4.flowi4_proto = IPPROTO_UDP;
+ fl4.daddr = dst->sin.sin_addr.s_addr;
+ fl4.saddr = vxlan->cfg.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(rt).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;
+ WARN_ONCE(1, "%s: vxlan_encap_bypass not supported\n",
+ dev->name);
+ goto tx_error;
+ }
+
+ tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
+ ttl = ttl ? : ip4_dst_hoplimit(&rt_dst(rt));
+ err = vxlan_xmit_skb(rt, sk, skb, fl4.saddr,
+ dst->sin.sin_addr.s_addr, tos, ttl, df,
+ src_port, dst_port, htonl(vni << 8), md,
+ !net_eq(vxlan->net, dev_net(vxlan->dev)),
+ flags);
+ if (err < 0) {
+ /* skb is already freed. */
+ skb = NULL;
+ goto rt_tx_error;
+ }
+
+ iptunnel_xmit_stats(err, &dev->stats, (struct pcpu_sw_netstats __percpu *)dev->tstats);
+#if IS_ENABLED(CONFIG_IPV6)
+ } else {
+ struct dst_entry *ndst;
+ struct flowi6 fl6;
+ u32 rt6i_flags;
+
+ memset(&fl6, 0, sizeof(fl6));
+ fl6.flowi6_oif = rdst ? rdst->remote_ifindex : 0;
+ fl6.daddr = dst->sin6.sin6_addr;
+ fl6.saddr = vxlan->cfg.saddr.sin6.sin6_addr;
+ fl6.flowi6_mark = skb->mark;
+ fl6.flowi6_proto = IPPROTO_UDP;
+
+#ifdef HAVE_IPV6_DST_LOOKUP_NET
+ if (ipv6_stub->ipv6_dst_lookup(vxlan->net, sk, &ndst, &fl6)) {
+#else
+#ifdef HAVE_IPV6_STUB
+ if (ipv6_stub->ipv6_dst_lookup(sk, &ndst, &fl6)) {
+#else
+ ndst = ip6_route_output(vxlan->net, sk, &fl6);
+ if (ndst->error) {
+#endif
+#endif
+ 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 */
+ rt6i_flags = ((struct rt6_info *)ndst)->rt6i_flags;
+ if (rt6i_flags & RTF_LOCAL &&
+ !(rt6i_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;
+ WARN_ONCE(1, "%s: vxlan_encap_bypass not supported\n",
+ dev->name);
+ goto tx_error;
+ }
+
+ ttl = ttl ? : ip6_dst_hoplimit(ndst);
+ err = vxlan6_xmit_skb(ndst, sk, skb, dev, &fl6.saddr, &fl6.daddr,
+ 0, ttl, src_port, dst_port, htonl(vni << 8), md,
+ !net_eq(vxlan->net, dev_net(vxlan->dev)),
+ 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
+ */
+netdev_tx_t rpl_vxlan_xmit(struct sk_buff *skb)
+{
+ struct net_device *dev = skb->dev;
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ const struct ip_tunnel_info *info;
+
+ info = skb_tunnel_info(skb);
+
+ skb_reset_mac_header(skb);
+
+ if ((vxlan->flags & VXLAN_F_PROXY))
+ goto out;
+
+ if (vxlan->flags & VXLAN_F_COLLECT_METADATA &&
+ info && info->mode & IP_TUNNEL_INFO_TX) {
+ vxlan_xmit_one(skb, dev, NULL, false);
+ return NETDEV_TX_OK;
+ }
+out:
+ pr_warn("vxlan: unsupported flag set %x", vxlan->flags);
+ kfree_skb(skb);
+ return NETDEV_TX_OK;
+}
+EXPORT_SYMBOL(rpl_vxlan_xmit);
+
+/* 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;
+
+ for (h = 0; h < FDB_HASH_SIZE; ++h) {
+ struct hlist_node *p, *n;
+
+ spin_lock_bh(&vxlan->hash_lock);
+ 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->cfg.age_interval * HZ;
+ if (time_before_eq(timeout, jiffies)) {
+ netdev_dbg(vxlan->dev,
+ "garbage collect %pM\n",
+ f->eth_addr);
+ f->state = NUD_STALE;
+ vxlan_fdb_destroy(vxlan, f);
+ } 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)
+{
+ struct vxlan_net *vn = net_generic(vxlan->net, vxlan_net_id);
+ __u32 vni = vxlan->default_dst.remote_vni;
+
+ vxlan->vn_sock = vs;
+ spin_lock(&vn->sock_lock);
+ hlist_add_head_rcu(&vxlan->hlist, vni_head(vs, vni));
+ spin_unlock(&vn->sock_lock);
+}
+
+/* Setup stats when device is created */
+#ifdef HAVE_DEV_TSTATS
+static int vxlan_init(struct net_device *dev)
+{
+ dev->tstats = (typeof(dev->tstats)) netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
+ if (!dev->tstats)
+ return -ENOMEM;
+
+ return 0;
+}
+#endif
+
+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);
+}
+
+#ifdef HAVE_DEV_TSTATS
+static void vxlan_uninit(struct net_device *dev)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+
+ vxlan_fdb_delete_default(vxlan);
+
+ free_percpu(dev->tstats);
+}
+#endif
+
+/* 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;
+ int ret = 0;
+
+ vs = vxlan_sock_add(vxlan->net, vxlan->cfg.dst_port,
+ vxlan->cfg.no_share, vxlan->flags);
+ if (IS_ERR(vs))
+ return PTR_ERR(vs);
+
+ vxlan_vs_add_dev(vs, vxlan);
+
+ if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip)) {
+ ret = vxlan_igmp_join(vxlan);
+ if (ret == -EADDRINUSE)
+ ret = 0;
+ if (ret) {
+ vxlan_sock_release(vs);
+ return ret;
+ }
+ }
+
+ if (vxlan->cfg.age_interval)
+ mod_timer(&vxlan->age_timer, jiffies + FDB_AGE_INTERVAL);
+
+ return ret;
+}
+
+/* Purge the forwarding table */
+static void vxlan_flush(struct vxlan_dev *vxlan)
+{
+ 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;
+ int ret = 0;
+
+ if (vxlan_addr_multicast(&vxlan->default_dst.remote_ip) &&
+ !vxlan_group_used(vn, vxlan))
+ ret = vxlan_igmp_leave(vxlan);
+
+ del_timer_sync(&vxlan->age_timer);
+
+ vxlan_flush(vxlan);
+ vxlan_sock_release(vs);
+
+ return ret;
+}
+
+/* Stub, nothing needs to be done. */
+static void vxlan_set_multicast_list(struct net_device *dev)
+{
+}
+
+static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ struct vxlan_rdst *dst = &vxlan->default_dst;
+ struct net_device *lowerdev;
+ 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 netdev_tx_t vxlan_dev_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ /* Drop All packets coming from networking stack. OVS-CB is
+ * not initialized for these packets.
+ */
+
+ dev_kfree_skb(skb);
+ dev->stats.tx_dropped++;
+ return NETDEV_TX_OK;
+}
+
+static const struct net_device_ops vxlan_netdev_ops = {
+#ifdef HAVE_DEV_TSTATS
+ .ndo_init = vxlan_init,
+ .ndo_uninit = vxlan_uninit,
+ .ndo_get_stats64 = ip_tunnel_get_stats64,
+#endif
+ .ndo_open = vxlan_open,
+ .ndo_stop = vxlan_stop,
+ .ndo_start_xmit = vxlan_dev_xmit,
+ .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,
+};
+
+/* Info for udev, that this is a virtual tunnel endpoint */
+static struct device_type vxlan_type = {
+ .name = "vxlan",
+};
+
+/* Initialize the device structure. */
+static void vxlan_setup(struct net_device *dev)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ unsigned int h;
+
+ eth_hw_addr_random(dev);
+ ether_setup(dev);
+
+ dev->netdev_ops = &vxlan_netdev_ops;
+ dev->destructor = free_netdev;
+ SET_NETDEV_DEVTYPE(dev, &vxlan_type);
+
+ dev->features |= NETIF_F_LLTX;
+ dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
+ dev->features |= NETIF_F_RXCSUM;
+ dev->features |= NETIF_F_GSO_SOFTWARE;
+
+ dev->vlan_features = dev->features;
+ dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,39)
+ 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;
+#endif
+
+#if 0
+ netif_keep_dst(dev);
+#endif
+ dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
+
+ INIT_LIST_HEAD(&vxlan->next);
+ spin_lock_init(&vxlan->hash_lock);
+
+ init_timer_deferrable(&vxlan->age_timer);
+ vxlan->age_timer.function = vxlan_cleanup;
+ vxlan->age_timer.data = (unsigned long) vxlan;
+
+ vxlan->cfg.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_PORT] = { .type = NLA_U16 },
+};
+
+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 free_vs_rcu(struct rcu_head *rcu)
+{
+ struct vxlan_sock *vs = container_of(rcu, struct vxlan_sock, rcu);
+
+ kfree(vs);
+}
+
+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);
+
+ call_rcu(&vs->rcu, free_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);
+ udp_conf.ipv6_v6only = 1;
+ } else {
+ udp_conf.family = AF_INET;
+ }
+
+ 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,
+ 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)) {
+ pr_info("Cannot bind port %d, err=%ld\n", ntohs(port),
+ PTR_ERR(sock));
+ kfree(vs);
+ return ERR_CAST(sock);
+ }
+
+ vs->sock = sock;
+ atomic_set(&vs->refcnt, 1);
+ vs->flags = (flags & VXLAN_F_RCV_FLAGS);
+
+ /* Initialize the vxlan udp offloads structure */
+#ifdef HAVE_UDP_OFFLOAD
+ vs->udp_offloads.port = port;
+ vs->udp_offloads.callbacks.gro_receive = vxlan_gro_receive;
+ vs->udp_offloads.callbacks.gro_complete = vxlan_gro_complete;
+ vxlan_notify_add_rx_port(vs);
+#endif
+
+ spin_lock(&vn->sock_lock);
+ hlist_add_head_rcu(&vs->hlist, vs_head(net, port));
+ 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;
+}
+
+static struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
+ 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;
+
+ if (!no_share) {
+ spin_lock(&vn->sock_lock);
+ vs = vxlan_find_sock(net, ipv6 ? AF_INET6 : AF_INET, port,
+ flags);
+ if (vs) {
+ if (!atomic_add_unless(&vs->refcnt, 1, 0))
+ vs = ERR_PTR(-EBUSY);
+ spin_unlock(&vn->sock_lock);
+ return vs;
+ }
+ spin_unlock(&vn->sock_lock);
+ }
+
+ return vxlan_socket_create(net, port, flags);
+}
+
+static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
+ struct vxlan_config *conf)
+{
+ 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;
+ int err;
+ bool use_ipv6 = false;
+ __be16 default_port = vxlan->cfg.dst_port;
+
+ vxlan->net = src_net;
+
+ dst->remote_vni = conf->vni;
+
+ memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
+
+ /* Unless IPv6 is explicitly requested, assume IPv4 */
+ if (!dst->remote_ip.sa.sa_family)
+ dst->remote_ip.sa.sa_family = AF_INET;
+
+ if (dst->remote_ip.sa.sa_family == AF_INET6 ||
+ vxlan->cfg.saddr.sa.sa_family == AF_INET6) {
+ if (!IS_ENABLED(CONFIG_IPV6))
+ return -EPFNOSUPPORT;
+ use_ipv6 = true;
+ }
+
+ if (conf->remote_ifindex) {
+ struct net_device *lowerdev
+ = __dev_get_by_index(src_net, conf->remote_ifindex);
+
+ dst->remote_ifindex = conf->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 (!conf->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;
+ dev->needed_headroom = ETH_HLEN + VXLAN6_HEADROOM;
+ } else {
+ dev->needed_headroom = ETH_HLEN + VXLAN_HEADROOM;
+ }
+
+ memcpy(&vxlan->cfg, conf, sizeof(*conf));
+ if (!vxlan->cfg.dst_port)
+ vxlan->cfg.dst_port = default_port;
+ vxlan->flags |= conf->flags;
+
+ if (!vxlan->cfg.age_interval)
+ vxlan->cfg.age_interval = FDB_AGE_DEFAULT;
+
+ if (vxlan_find_vni(src_net, conf->vni, use_ipv6 ? AF_INET6 : AF_INET,
+ vxlan->cfg.dst_port, vxlan->flags))
+ 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->cfg.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;
+}
+
+struct net_device *rpl_vxlan_dev_create(struct net *net, const char *name,
+ u8 name_assign_type, struct vxlan_config *conf)
+{
+ struct nlattr *tb[IFLA_MAX+1];
+ struct net_device *dev;
+ int err;
+
+ memset(&tb, 0, sizeof(tb));
+
+ dev = rtnl_create_link(net, (char *)name, name_assign_type,
+ &vxlan_link_ops, tb);
+ if (IS_ERR(dev))
+ return dev;
+
+ err = vxlan_dev_configure(net, dev, conf);
+ if (err < 0) {
+ free_netdev(dev);
+ return ERR_PTR(err);
+ }
+
+ return dev;
+}
+EXPORT_SYMBOL_GPL(rpl_vxlan_dev_create);
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,39)
+static int vxlan_newlink(struct net *src_net, struct net_device *dev,
+ struct nlattr *tb[], struct nlattr *data[])
+#else
+static int vxlan_newlink(struct net_device *dev,
+ struct nlattr *tb[], struct nlattr *data[])
+#endif
+{
+ return -EINVAL;
+}
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,39)
+static void vxlan_dellink(struct net_device *dev, struct list_head *head)
+#else
+static void vxlan_dellink(struct net_device *dev)
+#endif
+{
+ 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(__u8)) + /* IFLA_VXLAN_COLLECT_METADATA */
+ nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_AGEING */
+ nla_total_size(sizeof(__u32)) + /* IFLA_VXLAN_LIMIT */
+ nla_total_size(sizeof(struct ifla_vxlan_port_range)) +
+ nla_total_size(sizeof(__be16)) + /* IFLA_VXLAN_PORT */
+ nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_CSUM */
+ nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_TX */
+ nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_UDP_ZERO_CSUM6_RX */
+ nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_TX */
+ nla_total_size(sizeof(__u8)) + /* IFLA_VXLAN_REMCSUM_RX */
+ 0;
+}
+
+static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
+{
+ const struct vxlan_dev *vxlan = netdev_priv(dev);
+
+ if (nla_put_be16(skb, IFLA_VXLAN_PORT, vxlan->cfg.dst_port))
+ goto nla_put_failure;
+
+ return 0;
+
+nla_put_failure:
+ return -EMSGSIZE;
+}
+
+#ifdef HAVE_GET_LINK_NET
+static struct net *vxlan_get_link_net(const struct net_device *dev)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+
+ return vxlan->net;
+}
+#endif
+
+static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
+ .kind = "ovs_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,
+#ifdef HAVE_GET_LINK_NET
+ .get_link_net = vxlan_get_link_net,
+#endif
+};
+
+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)
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,39)
+ vxlan_dellink(vxlan->dev, &list_kill);
+#else
+ vxlan_dellink(vxlan->dev);
+#endif
+ }
+
+ 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(vxlan->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),
+};
+
+DEFINE_COMPAT_PNET_REG_FUNC(device)
+int rpl_vxlan_init_module(void)
+{
+ int rc;
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,39)
+ vxlan_wq = create_workqueue("vxlan");
+#else
+ vxlan_wq = alloc_workqueue("vxlan", 0, 0);
+#endif
+ 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;
+
+ pr_info("VxLAN tunneling driver\n");
+ return 0;
+out3:
+ unregister_netdevice_notifier(&vxlan_notifier_block);
+out2:
+ unregister_pernet_subsys(&vxlan_net_ops);
+out1:
+ destroy_workqueue(vxlan_wq);
+ return rc;
+}
+
+void rpl_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 */
+}
+#endif
projects / cascardo / ovs.git / blobdiff