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datapath: Sync vxlan tunneling code with upstream ovs-vxlan.

Browse Source 
Upstream vxlan implementation was changed according to few
comments.  Following patch brings back those changes to out
of tree ovs module.

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Acked-by: Jesse Gross <jesse@nicira.com>
This commit is contained in:
Pravin B Shelar
2013-08-26 11:05:35 -07:00
parent b366c1f436
commit a109c9fbf5
3 changed files with 82 additions and 164 deletions
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177
datapath/linux/compat/vxlan.c
View File

@@ -59,8 +59,6 @@
#define PORT_HASH_BITS 8
#define PORT_HASH_SIZE (1<<PORT_HASH_BITS)
#define VXLAN_N_VID (1u << 24)
#define VXLAN_VID_MASK (VXLAN_N_VID - 1)
/* IP header + UDP + VXLAN + Ethernet header */
#define VXLAN_HEADROOM (20 + 8 + 8 + 14)
#define VXLAN_HLEN (sizeof(struct udphdr) + sizeof(struct vxlanhdr))
@@ -75,10 +73,13 @@ struct vxlanhdr {
static int vxlan_net_id;
static int vxlan_init_module(void);
static void vxlan_cleanup_module(void);
/* per-network namespace private data for this module */
struct vxlan_net {
struct hlist_head sock_list[PORT_HASH_SIZE];
struct mutex sock_lock; /* RTNL lock nests inside this lock. */
spinlock_t sock_lock;
};
/* Socket hash table head */
@@ -90,7 +91,8 @@ static inline struct hlist_head *vs_head(struct net *net, __be16 port)
}
/* Find VXLAN socket based on network namespace and UDP port */
static struct vxlan_sock *vxlan_find_port(struct net *net, __be16 port)
static struct vxlan_sock *vxlan_find_sock(struct net *net, __be16 port)
{
struct vxlan_sock *vs;
@@ -104,7 +106,6 @@ static struct vxlan_sock *vxlan_find_port(struct net *net, __be16 port)
/* Callback from net/ipv4/udp.c to receive packets */
static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
{
struct vxlan_handler *vh;
struct vxlan_sock *vs;
struct vxlanhdr *vxh;
@@ -124,14 +125,12 @@ static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
goto drop;
vs = vxlan_find_port(sock_net(sk), inet_sport(sk));
vs = vxlan_find_sock(sock_net(sk), inet_sport(sk));
if (!vs)
goto drop;
list_for_each_entry_rcu(vh, &vs->handler_list, node) {
if (vh->rcv(vh, skb, vxh->vx_vni) == PACKET_RCVD)
return 0;
}
vs->rcv(vs, skb, vxh->vx_vni);
return 0;
drop:
/* Consume bad packet */
@@ -211,7 +210,7 @@ static int handle_offloads(struct sk_buff *skb)
return 0;
}
int vxlan_xmit_skb(struct net *net, struct vxlan_handler *vh,
int vxlan_xmit_skb(struct net *net, struct vxlan_sock *vs,
struct rtable *rt, struct sk_buff *skb,
__be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
__be16 src_port, __be16 dst_port, __be32 vni)
@@ -249,7 +248,7 @@ int vxlan_xmit_skb(struct net *net, struct vxlan_handler *vh,
uh->len = htons(skb->len);
uh->check = 0;
vxlan_set_owner(vh->vs->sock->sk, skb);
vxlan_set_owner(vs->sock->sk, skb);
err = handle_offloads(skb);
if (err)
@@ -259,8 +258,26 @@ int vxlan_xmit_skb(struct net *net, struct vxlan_handler *vh,
IPPROTO_UDP, tos, ttl, df);
}
static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port)
static void rcu_free_vs(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);
sk_release_kernel(vs->sock->sk);
call_rcu(&vs->rcu, rcu_free_vs);
vxlan_cleanup_module();
}
static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port,
vxlan_rcv_t *rcv, void *data)
{
struct vxlan_net *vn = net_generic(net, vxlan_net_id);
struct vxlan_sock *vs;
struct sock *sk;
struct sockaddr_in vxlan_addr = {
@@ -271,8 +288,12 @@ static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port)
int rc;
vs = kmalloc(sizeof(*vs), GFP_KERNEL);
if (!vs)
if (!vs) {
pr_debug("memory alocation failure\n");
return ERR_PTR(-ENOMEM);
}
INIT_WORK(&vs->del_work, vxlan_del_work);
/* Create UDP socket for encapsulation receive. */
rc = sock_create_kern(AF_INET, SOCK_DGRAM, IPPROTO_UDP, &vs->sock);
@@ -287,81 +308,36 @@ static struct vxlan_sock *vxlan_socket_create(struct net *net, __be16 port)
sk_change_net(sk, net);
rc = kernel_bind(vs->sock, (struct sockaddr *) &vxlan_addr,
sizeof(vxlan_addr));
sizeof(vxlan_addr));
if (rc < 0) {
pr_debug("bind for UDP socket %pI4:%u (%d)\n",
&vxlan_addr.sin_addr, ntohs(vxlan_addr.sin_port), rc);
&vxlan_addr.sin_addr, ntohs(vxlan_addr.sin_port), rc);
sk_release_kernel(sk);
kfree(vs);
return ERR_PTR(rc);
}
vs->rcv = rcv;
vs->data = data;
/* Disable multicast loopback */
inet_sk(sk)->mc_loop = 0;
INIT_LIST_HEAD(&vs->handler_list);
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. */
udp_sk(sk)->encap_type = 1;
udp_sk(sk)->encap_rcv = vxlan_udp_encap_recv;
udp_encap_enable();
return vs;
}
static void rcu_free_vs_callback(struct rcu_head *rcu)
{
struct vxlan_sock *vs = container_of(rcu, struct vxlan_sock, rcu);
kfree(vs);
}
static void vxlan_socket_del(struct vxlan_sock *vs)
{
if (list_empty(&vs->handler_list)) {
hlist_del_rcu(&vs->hlist);
sk_release_kernel(vs->sock->sk);
call_rcu(&vs->rcu, rcu_free_vs_callback);
}
}
static int vxlan_init_module(void);
static void vxlan_cleanup_module(void);
static void rcu_free_vh_callback(struct rcu_head *rcu)
{
struct vxlan_handler *vh = container_of(rcu, struct vxlan_handler, rcu);
kfree(vh);
}
static void vh_del_work(struct work_struct *work)
{
struct vxlan_handler *vh = container_of(work, struct vxlan_handler, del_work);
struct vxlan_sock *vs = vh->vs;
struct net *net = sock_net(vs->sock->sk);
struct vxlan_net *vn = net_generic(net, vxlan_net_id);
mutex_lock(&vn->sock_lock);
list_del_rcu(&vh->node);
call_rcu(&vh->rcu, rcu_free_vh_callback);
vxlan_socket_del(vs);
mutex_unlock(&vn->sock_lock);
vxlan_cleanup_module();
}
struct vxlan_handler *vxlan_handler_add(struct net *net,
__be16 portno, vxlan_rcv_t *rcv,
void *data, int priority, bool create)
struct vxlan_sock *vxlan_sock_add(struct net *net, __be16 port,
vxlan_rcv_t *rcv, void *data,
bool no_share)
{
struct vxlan_net *vn;
struct vxlan_sock *vs;
struct vxlan_handler *vh;
struct vxlan_handler *new;
int err;
err = vxlan_init_module();
@@ -369,64 +345,19 @@ struct vxlan_handler *vxlan_handler_add(struct net *net,
return ERR_PTR(err);
vn = net_generic(net, vxlan_net_id);
mutex_lock(&vn->sock_lock);
/* Look to see if can reuse socket */
vs = vxlan_find_port(net, portno);
if (!vs) {
vs = vxlan_socket_create(net, portno);
if (IS_ERR(vs)) {
new = (void *) vs;
goto out;
}
}
/* Try existing vxlan hanlders for this socket. */
list_for_each_entry(vh, &vs->handler_list, node) {
if (vh->rcv == rcv) {
if (create) {
vxlan_socket_del(vs);
new = ERR_PTR(-EEXIST);
goto out;
}
atomic_inc(&vh->refcnt);
new = vh;
goto out;
}
}
new = kzalloc(sizeof(*new), GFP_KERNEL);
if (!new) {
vxlan_socket_del(vs);
new = ERR_PTR(-ENOMEM);
goto out;
}
new->rcv = rcv;
new->vs = vs;
atomic_set(&new->refcnt, 1);
INIT_WORK(&new->del_work, vh_del_work);
new->data = data;
new->priority = priority;
list_for_each_entry(vh, &vs->handler_list, node) {
if (vh->priority > priority) {
list_add_tail_rcu(&new->node, &vh->node);
goto out;
}
}
list_add_tail_rcu(&new->node, &vs->handler_list);
out:
mutex_unlock(&vn->sock_lock);
return new;
vs = vxlan_socket_create(net, port, rcv, data);
return vs;
}
void vxlan_handler_put(struct vxlan_handler *vh)
void vxlan_sock_release(struct vxlan_sock *vs)
{
BUG_ON(!vh->vs);
struct vxlan_net *vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id);
if (atomic_dec_and_test(&vh->refcnt))
queue_work(&vh->del_work);
spin_lock(&vn->sock_lock);
hlist_del_rcu(&vs->hlist);
spin_unlock(&vn->sock_lock);
queue_work(&vs->del_work);
}
static int vxlan_init_net(struct net *net)
@@ -434,7 +365,7 @@ static int vxlan_init_net(struct net *net)
struct vxlan_net *vn = net_generic(net, vxlan_net_id);
unsigned int h;
mutex_init(&vn->sock_lock);
spin_lock_init(&vn->sock_lock);
for (h = 0; h < PORT_HASH_SIZE; ++h)
INIT_HLIST_HEAD(&vn->sock_list[h]);