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openflow/datapath/datapath.c
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/*
* Distributed under the terms of the GNU GPL version 2.
* Copyright (c) 2007, 2008 The Board of Trustees of The Leland
* Stanford Junior University
*/
/* Functions for managing the dp interface/device. */
#include <linux/module.h>
#include <linux/if_arp.h>
#include <linux/if_bridge.h>
#include <linux/if_vlan.h>
#include <linux/in.h>
#include <net/genetlink.h>
#include <linux/ip.h>
#include <linux/etherdevice.h>
#include <linux/kernel.h>
#include <linux/mutex.h>
#include <linux/rtnetlink.h>
#include <linux/timer.h>
#include <linux/rcupdate.h>
#include <linux/version.h>
#include <linux/ethtool.h>
#include <linux/random.h>
#include <asm/system.h>
#include <linux/netfilter_bridge.h>
#include <linux/inetdevice.h>
#include <linux/list.h>
#include "openflow-netlink.h"
#include "datapath.h"
#include "table.h"
#include "chain.h"
#include "forward.h"
#include "flow.h"
#include "datapath_t.h"
#include "compat.h"
/* Number of seconds between runs of the flow expiration code. */
#define EXPIRE_SECS 1
#define BRIDGE_PORT_NO_FLOOD 0x00000001
#define UINT32_MAX 4294967295U
struct net_bridge_port {
u16 port_no;
u32 flags;
struct datapath *dp;
struct net_device *dev;
struct list_head node; /* Element in datapath.ports. */
};
static struct genl_family dp_genl_family;
static struct genl_multicast_group mc_group;
int dp_dev_setup(struct net_device *dev);
/* It's hard to imagine wanting more than one datapath, but... */
#define DP_MAX 32
/* datapaths. Protected on the read side by rcu_read_lock, on the write side
* by dp_mutex.
*
* It is safe to access the datapath and net_bridge_port structures with just
* the dp_mutex, but to access the chain you need to take the rcu_read_lock
* also (because dp_mutex doesn't prevent flows from being destroyed).
*/
static struct datapath *dps[DP_MAX];
static DEFINE_MUTEX(dp_mutex);
static void dp_timer_handler(unsigned long arg);
static int send_port_status(struct net_bridge_port *p, uint8_t status);
/* nla_unreserve - reduce amount of space reserved by nla_reserve
* @skb: socket buffer from which to recover room
* @nla: netlink attribute to adjust
* @len: amount by which to reduce attribute payload
*
* Reduces amount of space reserved by a call to nla_reserve.
*
* No other attributes may be added between calling nla_reserve and this
* function, since it will create a hole in the message.
*/
void nla_unreserve(struct sk_buff *skb, struct nlattr *nla, int len)
{
skb->tail -= len;
skb->len -= len;
nla->nla_len -= len;
}
/* Generates a unique datapath id. It incorporates the datapath index
* and a hardware address, if available. If not, it generates a random
* one.
*/
static
uint64_t gen_datapath_id(uint16_t dp_idx)
{
uint64_t id;
int i;
struct net_device *dev;
/* The top 16 bits are used to identify the datapath. The lower 48 bits
* use an interface address. */
id = (uint64_t)dp_idx << 48;
if ((dev = dev_get_by_name(&init_net, "ctl0"))
|| (dev = dev_get_by_name(&init_net, "eth0"))) {
for (i=0; i<ETH_ALEN; i++) {
id |= (uint64_t)dev->dev_addr[i] << (8*(ETH_ALEN-1 - i));
}
dev_put(dev);
} else {
/* Randomly choose the lower 48 bits if we cannot find an
* address and mark the most significant bit to indicate that
* this was randomly generated. */
uint8_t rand[ETH_ALEN];
get_random_bytes(rand, ETH_ALEN);
id |= (uint64_t)1 << 63;
for (i=0; i<ETH_ALEN; i++) {
id |= (uint64_t)rand[i] << (8*(ETH_ALEN-1 - i));
}
}
return id;
}
/* Creates a new datapath numbered 'dp_idx'. Returns 0 for success or a
* negative error code.
*
* Not called with any locks. */
static int new_dp(int dp_idx)
{
struct datapath *dp;
int err;
if (dp_idx < 0 || dp_idx >= DP_MAX)
return -EINVAL;
if (!try_module_get(THIS_MODULE))
return -ENODEV;
mutex_lock(&dp_mutex);
dp = rcu_dereference(dps[dp_idx]);
if (dp != NULL) {
err = -EEXIST;
goto err_unlock;
}
err = -ENOMEM;
dp = kzalloc(sizeof *dp, GFP_KERNEL);
if (dp == NULL)
goto err_unlock;
dp->dp_idx = dp_idx;
dp->id = gen_datapath_id(dp_idx);
dp->chain = chain_create(dp);
if (dp->chain == NULL)
goto err_free_dp;
INIT_LIST_HEAD(&dp->port_list);
#if 0
/* Setup our "of" device */
dp->dev.priv = dp;
rtnl_lock();
err = dp_dev_setup(&dp->dev);
rtnl_unlock();
if (err != 0)
printk("datapath: problem setting up 'of' device\n");
#endif
dp->miss_send_len = OFP_DEFAULT_MISS_SEND_LEN;
setup_timer(&dp->timer, dp_timer_handler, (unsigned long) dp);
mod_timer(&dp->timer, round_jiffies(jiffies + (EXPIRE_SECS * HZ)));
rcu_assign_pointer(dps[dp_idx], dp);
mutex_unlock(&dp_mutex);
return 0;
err_free_dp:
kfree(dp);
err_unlock:
mutex_unlock(&dp_mutex);
module_put(THIS_MODULE);
return err;
}
/* Find and return a free port number under 'dp'. Called under dp_mutex. */
static int find_portno(struct datapath *dp)
{
int i;
for (i = 0; i < OFPP_MAX; i++)
if (dp->ports[i] == NULL)
return i;
return -EXFULL;
}
static struct net_bridge_port *new_nbp(struct datapath *dp,
struct net_device *dev)
{
struct net_bridge_port *p;
int port_no;
port_no = find_portno(dp);
if (port_no < 0)
return ERR_PTR(port_no);
p = kzalloc(sizeof(*p), GFP_KERNEL);
if (p == NULL)
return ERR_PTR(-ENOMEM);
p->dp = dp;
dev_hold(dev);
p->dev = dev;
p->port_no = port_no;
return p;
}
/* Called with dp_mutex. */
int add_switch_port(struct datapath *dp, struct net_device *dev)
{
struct net_bridge_port *p;
if (dev->flags & IFF_LOOPBACK || dev->type != ARPHRD_ETHER)
return -EINVAL;
if (dev->br_port != NULL)
return -EBUSY;
p = new_nbp(dp, dev);
if (IS_ERR(p))
return PTR_ERR(p);
dev_hold(dev);
rcu_assign_pointer(dev->br_port, p);
rtnl_lock();
dev_set_promiscuity(dev, 1);
rtnl_unlock();
rcu_assign_pointer(dp->ports[p->port_no], p);
list_add_rcu(&p->node, &dp->port_list);
/* Notify the ctlpath that this port has been added */
send_port_status(p, OFPPR_ADD);
return 0;
}
/* Delete 'p' from switch.
* Called with dp_mutex. */
static int del_switch_port(struct net_bridge_port *p)
{
/* First drop references to device. */
rtnl_lock();
dev_set_promiscuity(p->dev, -1);
rtnl_unlock();
list_del_rcu(&p->node);
rcu_assign_pointer(p->dp->ports[p->port_no], NULL);
rcu_assign_pointer(p->dev->br_port, NULL);
/* Then wait until no one is still using it, and destroy it. */
synchronize_rcu();
/* Notify the ctlpath that this port no longer exists */
send_port_status(p, OFPPR_DELETE);
dev_put(p->dev);
kfree(p);
return 0;
}
/* Called with dp_mutex. */
static void del_dp(struct datapath *dp)
{
struct net_bridge_port *p, *n;
#if 0
/* Unregister the "of" device of this dp */
rtnl_lock();
unregister_netdevice(&dp->dev);
rtnl_unlock();
#endif
/* Drop references to DP. */
list_for_each_entry_safe (p, n, &dp->port_list, node)
del_switch_port(p);
del_timer_sync(&dp->timer);
rcu_assign_pointer(dps[dp->dp_idx], NULL);
/* Wait until no longer in use, then destroy it. */
synchronize_rcu();
chain_destroy(dp->chain);
kfree(dp);
module_put(THIS_MODULE);
}
static void dp_timer_handler(unsigned long arg)
{
struct datapath *dp = (struct datapath *) arg;
#if 1
chain_timeout(dp->chain);
#else
int count = chain_timeout(dp->chain);
chain_print_stats(dp->chain);
if (count)
printk("%d flows timed out\n", count);
#endif
mod_timer(&dp->timer, round_jiffies(jiffies + (EXPIRE_SECS * HZ)));
}
/*
* Used as br_handle_frame_hook. (Cannot run bridge at the same time, even on
* different set of devices!) Returns 0 if *pskb should be processed further,
* 1 if *pskb is handled. */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22)
/* Called with rcu_read_lock. */
static struct sk_buff *dp_frame_hook(struct net_bridge_port *p,
struct sk_buff *skb)
{
struct ethhdr *eh = eth_hdr(skb);
struct sk_buff *skb_local = NULL;
if (compare_ether_addr(eh->h_dest, skb->dev->dev_addr) == 0)
return skb;
if (is_broadcast_ether_addr(eh->h_dest)
|| is_multicast_ether_addr(eh->h_dest)
|| is_local_ether_addr(eh->h_dest))
skb_local = skb_clone(skb, GFP_ATOMIC);
/* Push the Ethernet header back on. */
if (skb->protocol == htons(ETH_P_8021Q))
skb_push(skb, VLAN_ETH_HLEN);
else
skb_push(skb, ETH_HLEN);
fwd_port_input(p->dp->chain, skb, p->port_no);
return skb_local;
}
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
static int dp_frame_hook(struct net_bridge_port *p, struct sk_buff **pskb)
{
/* Push the Ethernet header back on. */
if ((*pskb)->protocol == htons(ETH_P_8021Q))
skb_push(*pskb, VLAN_ETH_HLEN);
else
skb_push(*pskb, ETH_HLEN);
fwd_port_input(p->dp->chain, *pskb, p->port_no);
return 1;
}
#else
/* NB: This has only been tested on 2.4.35 */
/* Called without any locks (?) */
static void dp_frame_hook(struct sk_buff *skb)
{
struct net_bridge_port *p = skb->dev->br_port;
/* Push the Ethernet header back on. */
if (skb->protocol == htons(ETH_P_8021Q))
skb_push(skb, VLAN_ETH_HLEN);
else
skb_push(skb, ETH_HLEN);
if (p) {
rcu_read_lock();
fwd_port_input(p->dp->chain, skb, p->port_no);
rcu_read_unlock();
} else
kfree_skb(skb);
}
#endif
/* Forwarding output path.
* Based on net/bridge/br_forward.c. */
/* Don't forward packets to originating port or with flooding disabled */
static inline int should_deliver(const struct net_bridge_port *p,
const struct sk_buff *skb)
{
if ((skb->dev == p->dev) || (p->flags & BRIDGE_PORT_NO_FLOOD)) {
return 0;
}
return 1;
}
static inline unsigned packet_length(const struct sk_buff *skb)
{
int length = skb->len - ETH_HLEN;
if (skb->protocol == htons(ETH_P_8021Q))
length -= VLAN_HLEN;
return length;
}
static int
flood(struct datapath *dp, struct sk_buff *skb)
{
struct net_bridge_port *p;
int prev_port;
prev_port = -1;
list_for_each_entry_rcu (p, &dp->port_list, node) {
if (!should_deliver(p, skb))
continue;
if (prev_port != -1) {
struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
if (!clone) {
kfree_skb(skb);
return -ENOMEM;
}
dp_output_port(dp, clone, prev_port);
}
prev_port = p->port_no;
}
if (prev_port != -1)
dp_output_port(dp, skb, prev_port);
else
kfree_skb(skb);
return 0;
}
/* Marks 'skb' as having originated from 'in_port' in 'dp'.
FIXME: how are devices reference counted? */
int dp_set_origin(struct datapath *dp, uint16_t in_port,
struct sk_buff *skb)
{
if (in_port < OFPP_MAX && dp->ports[in_port]) {
skb->dev = dp->ports[in_port]->dev;
return 0;
}
return -ENOENT;
}
/* Takes ownership of 'skb' and transmits it to 'out_port' on 'dp'.
*/
int dp_output_port(struct datapath *dp, struct sk_buff *skb, int out_port)
{
struct net_bridge_port *p;
int len = skb->len;
BUG_ON(!skb);
if (out_port == OFPP_FLOOD)
return flood(dp, skb);
else if (out_port == OFPP_CONTROLLER)
return dp_output_control(dp, skb, fwd_save_skb(skb), 0,
OFPR_ACTION);
else if (out_port >= OFPP_MAX)
goto bad_port;
p = dp->ports[out_port];
if (p == NULL)
goto bad_port;
skb->dev = p->dev;
if (packet_length(skb) > skb->dev->mtu) {
printk("dropped over-mtu packet: %d > %d\n",
packet_length(skb), skb->dev->mtu);
kfree_skb(skb);
return -E2BIG;
}
dev_queue_xmit(skb);
return len;
bad_port:
kfree_skb(skb);
if (net_ratelimit())
printk("can't forward to bad port %d\n", out_port);
return -ENOENT;
}
/* Takes ownership of 'skb' and transmits it to 'dp''s control path. If
* 'buffer_id' != -1, then only the first 64 bytes of 'skb' are sent;
* otherwise, all of 'skb' is sent. 'reason' indicates why 'skb' is being
* sent. 'max_len' sets the maximum number of bytes that the caller
* wants to be sent; a value of 0 indicates the entire packet should be
* sent. */
int
dp_output_control(struct datapath *dp, struct sk_buff *skb,
uint32_t buffer_id, size_t max_len, int reason)
{
/* FIXME? packet_rcv_spkt in net/packet/af_packet.c does some stuff
that we should possibly be doing here too. */
/* FIXME? Can we avoid creating a new skbuff in the case where we
* forward the whole packet? */
struct sk_buff *f_skb;
struct nlattr *attr;
struct ofp_packet_in *opi;
size_t opi_len;
size_t len, fwd_len;
void *data;
int err = -ENOMEM;
fwd_len = skb->len;
if ((buffer_id != (uint32_t) -1) && max_len)
fwd_len = min(fwd_len, max_len);
len = nla_total_size(offsetof(struct ofp_packet_in, data) + fwd_len)
+ nla_total_size(sizeof(uint32_t));
f_skb = genlmsg_new(len, GFP_ATOMIC);
if (!f_skb)
goto error_free_skb;
data = genlmsg_put(f_skb, 0, 0, &dp_genl_family, 0,
DP_GENL_C_OPENFLOW);
if (data == NULL)
goto error_free_f_skb;
NLA_PUT_U32(f_skb, DP_GENL_A_DP_IDX, dp->dp_idx);
opi_len = offsetof(struct ofp_packet_in, data) + fwd_len;
attr = nla_reserve(f_skb, DP_GENL_A_OPENFLOW, opi_len);
if (!attr)
goto error_free_f_skb;
opi = nla_data(attr);
opi->header.version = OFP_VERSION;
opi->header.type = OFPT_PACKET_IN;
opi->header.length = htons(opi_len);
opi->header.xid = htonl(0);
opi->buffer_id = htonl(buffer_id);
opi->total_len = htons(skb->len);
opi->in_port = htons(skb->dev->br_port->port_no);
opi->reason = reason;
opi->pad = 0;
SKB_LINEAR_ASSERT(skb);
memcpy(opi->data, skb_mac_header(skb), fwd_len);
err = genlmsg_end(f_skb, data);
if (err < 0)
goto error_free_f_skb;
err = genlmsg_multicast(f_skb, 0, mc_group.id, GFP_ATOMIC);
if (err && net_ratelimit())
printk(KERN_WARNING "dp_output_control: genlmsg_multicast failed: %d\n", err);
kfree_skb(skb);
return err;
nla_put_failure:
error_free_f_skb:
nlmsg_free(f_skb);
error_free_skb:
kfree_skb(skb);
if (net_ratelimit())
printk(KERN_ERR "dp_output_control: failed to send: %d\n", err);
return err;
}
static void fill_port_desc(struct net_bridge_port *p, struct ofp_phy_port *desc)
{
desc->port_no = htons(p->port_no);
strncpy(desc->name, p->dev->name, OFP_MAX_PORT_NAME_LEN);
desc->name[OFP_MAX_PORT_NAME_LEN-1] = '\0';
memcpy(desc->hw_addr, p->dev->dev_addr, ETH_ALEN);
desc->flags = htonl(p->flags);
desc->features = 0;
desc->speed = 0;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,24)
if (p->dev->ethtool_ops && p->dev->ethtool_ops->get_settings) {
struct ethtool_cmd ecmd = { .cmd = ETHTOOL_GSET };
if (!p->dev->ethtool_ops->get_settings(p->dev, &ecmd)) {
if (ecmd.supported & SUPPORTED_10baseT_Half)
desc->features |= OFPPF_10MB_HD;
if (ecmd.supported & SUPPORTED_10baseT_Full)
desc->features |= OFPPF_10MB_FD;
if (ecmd.supported & SUPPORTED_100baseT_Half)
desc->features |= OFPPF_100MB_HD;
if (ecmd.supported & SUPPORTED_100baseT_Full)
desc->features |= OFPPF_100MB_FD;
if (ecmd.supported & SUPPORTED_1000baseT_Half)
desc->features |= OFPPF_1GB_HD;
if (ecmd.supported & SUPPORTED_1000baseT_Full)
desc->features |= OFPPF_1GB_FD;
/* 10Gbps half-duplex doesn't exist... */
if (ecmd.supported & SUPPORTED_10000baseT_Full)
desc->features |= OFPPF_10GB_FD;
desc->features = htonl(desc->features);
desc->speed = htonl(ecmd.speed);
}
}
#endif
}
static int
fill_data_hello(struct datapath *dp, struct ofp_data_hello *odh)
{
struct net_bridge_port *p;
int port_count = 0;
odh->header.version = OFP_VERSION;
odh->header.type = OFPT_DATA_HELLO;
odh->header.xid = htonl(0);
odh->datapath_id = cpu_to_be64(dp->id);
odh->n_exact = htonl(2 * TABLE_HASH_MAX_FLOWS);
odh->n_mac_only = htonl(TABLE_MAC_MAX_FLOWS);
odh->n_compression = 0; /* Not supported */
odh->n_general = htonl(TABLE_LINEAR_MAX_FLOWS);
odh->buffer_mb = htonl(UINT32_MAX);
odh->n_buffers = htonl(N_PKT_BUFFERS);
odh->capabilities = htonl(OFP_SUPPORTED_CAPABILITIES);
odh->actions = htonl(OFP_SUPPORTED_ACTIONS);
odh->miss_send_len = htons(dp->miss_send_len);
list_for_each_entry_rcu (p, &dp->port_list, node) {
fill_port_desc(p, &odh->ports[port_count]);
port_count++;
}
return port_count;
}
int
dp_send_hello(struct datapath *dp)
{
struct sk_buff *skb;
struct nlattr *attr;
struct ofp_data_hello *odh;
size_t odh_max_len, odh_len, port_max_len, len;
void *data;
int err = -ENOMEM;
int port_count;
/* Overallocate, since we can't reliably determine the number of
* ports a priori. */
port_max_len = sizeof(struct ofp_phy_port) * OFPP_MAX;
len = nla_total_size(sizeof(*odh) + port_max_len)
+ nla_total_size(sizeof(uint32_t));
skb = genlmsg_new(len, GFP_ATOMIC);
if (!skb) {
if (net_ratelimit())
printk("dp_send_hello: genlmsg_new failed\n");
goto error;
}
data = genlmsg_put(skb, 0, 0, &dp_genl_family, 0,
DP_GENL_C_OPENFLOW);
if (data == NULL) {
if (net_ratelimit())
printk("dp_send_hello: genlmsg_put failed\n");
goto error;
}
NLA_PUT_U32(skb, DP_GENL_A_DP_IDX, dp->dp_idx);
odh_max_len = sizeof(*odh) + port_max_len;
attr = nla_reserve(skb, DP_GENL_A_OPENFLOW, odh_max_len);
if (!attr) {
if (net_ratelimit())
printk("dp_send_hello: nla_reserve failed\n");
goto error;
}
odh = nla_data(attr);
port_count = fill_data_hello(dp, odh);
/* Only now that we know how many ports we've added can we say
* say something about the length. */
odh_len = sizeof(*odh) + (sizeof(struct ofp_phy_port) * port_count);
odh->header.length = htons(odh_len);
/* Take back the unused part that was reserved */
nla_unreserve(skb, attr, (odh_max_len - odh_len));
err = genlmsg_end(skb, data);
if (err < 0) {
if (net_ratelimit())
printk("dp_send_hello: genlmsg_end failed\n");
goto error;
}
err = genlmsg_multicast(skb, 0, mc_group.id, GFP_ATOMIC);
if (err && net_ratelimit())
printk(KERN_WARNING "dp_send_hello: genlmsg_multicast failed: %d\n", err);
return err;
nla_put_failure:
error:
kfree_skb(skb);
if (net_ratelimit())
printk(KERN_ERR "dp_send_hello: failed to send: %d\n", err);
return err;
}
int
dp_update_port_flags(struct datapath *dp, const struct ofp_phy_port *opp)
{
struct net_bridge_port *p;
p = dp->ports[htons(opp->port_no)];
/* Make sure the port id hasn't changed since this was sent */
if (!p || memcmp(opp->hw_addr, p->dev->dev_addr, ETH_ALEN) != 0)
return -1;
p->flags = htonl(opp->flags);
return 0;
}
static int
send_port_status(struct net_bridge_port *p, uint8_t status)
{
struct sk_buff *skb;
struct nlattr *attr;
struct ofp_port_status *ops;
void *data;
int err = -ENOMEM;
skb = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
if (!skb) {
if (net_ratelimit())
printk("send_port_status: genlmsg_new failed\n");
goto error;
}
data = genlmsg_put(skb, 0, 0, &dp_genl_family, 0,
DP_GENL_C_OPENFLOW);
if (data == NULL) {
if (net_ratelimit())
printk("send_port_status: genlmsg_put failed\n");
goto error;
}
NLA_PUT_U32(skb, DP_GENL_A_DP_IDX, p->dp->dp_idx);
attr = nla_reserve(skb, DP_GENL_A_OPENFLOW, sizeof(*ops));
if (!attr) {
if (net_ratelimit())
printk("send_port_status: nla_reserve failed\n");
goto error;
}
ops = nla_data(attr);
ops->header.version = OFP_VERSION;
ops->header.type = OFPT_PORT_STATUS;
ops->header.length = htons(sizeof(*ops));
ops->header.xid = htonl(0);
ops->reason = status;
fill_port_desc(p, &ops->desc);
err = genlmsg_end(skb, data);
if (err < 0) {
if (net_ratelimit())
printk("send_port_status: genlmsg_end failed\n");
goto error;
}
err = genlmsg_multicast(skb, 0, mc_group.id, GFP_ATOMIC);
if (err && net_ratelimit())
printk(KERN_WARNING "send_port_status: genlmsg_multicast failed: %d\n", err);
return err;
nla_put_failure:
error:
kfree_skb(skb);
if (net_ratelimit())
printk(KERN_ERR "send_port_status: failed to send: %d\n", err);
return err;
}
int
dp_send_flow_expired(struct datapath *dp, struct sw_flow *flow)
{
struct sk_buff *skb;
struct nlattr *attr;
struct ofp_flow_expired *ofe;
void *data;
unsigned long duration_j;
int err = -ENOMEM;
skb = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
if (!skb) {
if (net_ratelimit())
printk("dp_send_flow_expired: genlmsg_new failed\n");
goto error;
}
data = genlmsg_put(skb, 0, 0, &dp_genl_family, 0,
DP_GENL_C_OPENFLOW);
if (data == NULL) {
if (net_ratelimit())
printk("dp_send_flow_expired: genlmsg_put failed\n");
goto error;
}
NLA_PUT_U32(skb, DP_GENL_A_DP_IDX, dp->dp_idx);
attr = nla_reserve(skb, DP_GENL_A_OPENFLOW, sizeof(*ofe));
if (!attr) {
if (net_ratelimit())
printk("dp_send_flow_expired: nla_reserve failed\n");
goto error;
}
ofe = nla_data(attr);
ofe->header.version = OFP_VERSION;
ofe->header.type = OFPT_FLOW_EXPIRED;
ofe->header.length = htons(sizeof(*ofe));
ofe->header.xid = htonl(0);
flow_fill_match(&ofe->match, &flow->key);
duration_j = (flow->timeout - HZ * flow->max_idle) - flow->init_time;
ofe->duration = htonl(duration_j / HZ);
ofe->packet_count = cpu_to_be64(flow->packet_count);
ofe->byte_count = cpu_to_be64(flow->byte_count);
err = genlmsg_end(skb, data);
if (err < 0) {
if (net_ratelimit())
printk("dp_send_flow_expired: genlmsg_end failed\n");
goto error;
}
err = genlmsg_multicast(skb, 0, mc_group.id, GFP_ATOMIC);
if (err && net_ratelimit())
printk(KERN_WARNING "send_flow_expired: genlmsg_multicast failed: %d\n", err);
return err;
nla_put_failure:
error:
kfree_skb(skb);
if (net_ratelimit())
printk(KERN_ERR "send_flow_expired: failed to send: %d\n", err);
return err;
}
/* Generic Netlink interface.
*
* See netlink(7) for an introduction to netlink. See
* http://linux-net.osdl.org/index.php/Netlink for more information and
* pointers on how to work with netlink and Generic Netlink in the kernel and
* in userspace. */
static struct genl_family dp_genl_family = {
.id = GENL_ID_GENERATE,
.hdrsize = 0,
.name = DP_GENL_FAMILY_NAME,
.version = 1,
.maxattr = DP_GENL_A_MAX,
};
/* Attribute policy: what each attribute may contain. */
static struct nla_policy dp_genl_policy[DP_GENL_A_MAX + 1] = {
[DP_GENL_A_DP_IDX] = { .type = NLA_U32 },
[DP_GENL_A_MC_GROUP] = { .type = NLA_U32 },
[DP_GENL_A_PORTNAME] = { .type = NLA_STRING }
};
static int dp_genl_add(struct sk_buff *skb, struct genl_info *info)
{
if (!info->attrs[DP_GENL_A_DP_IDX])
return -EINVAL;
return new_dp(nla_get_u32(info->attrs[DP_GENL_A_DP_IDX]));
}
static struct genl_ops dp_genl_ops_add_dp = {
.cmd = DP_GENL_C_ADD_DP,
.flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
.policy = dp_genl_policy,
.doit = dp_genl_add,
.dumpit = NULL,
};
struct datapath *dp_get(int dp_idx)
{
if (dp_idx < 0 || dp_idx > DP_MAX)
return NULL;
return rcu_dereference(dps[dp_idx]);
}
static int dp_genl_del(struct sk_buff *skb, struct genl_info *info)
{
struct datapath *dp;
int err;
if (!info->attrs[DP_GENL_A_DP_IDX])
return -EINVAL;
mutex_lock(&dp_mutex);
dp = dp_get(nla_get_u32((info->attrs[DP_GENL_A_DP_IDX])));
if (!dp)
err = -ENOENT;
else {
del_dp(dp);
err = 0;
}
mutex_unlock(&dp_mutex);
return err;
}
static struct genl_ops dp_genl_ops_del_dp = {
.cmd = DP_GENL_C_DEL_DP,
.flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
.policy = dp_genl_policy,
.doit = dp_genl_del,
.dumpit = NULL,
};
/* Queries a datapath for related information. Currently the only relevant
* information is the datapath's multicast group ID. Really we want one
* multicast group per datapath, but because of locking issues[*] we can't
* easily get one. Thus, every datapath will currently return the same
* global multicast group ID, but in the future it would be nice to fix that.
*
* [*] dp_genl_add, to add a new datapath, is called under the genl_lock
* mutex, and genl_register_mc_group, called to acquire a new multicast
* group ID, also acquires genl_lock, thus deadlock.
*/
static int dp_genl_query(struct sk_buff *skb, struct genl_info *info)
{
struct datapath *dp;
struct sk_buff *ans_skb = NULL;
int dp_idx;
int err = -ENOMEM;
if (!info->attrs[DP_GENL_A_DP_IDX])
return -EINVAL;
rcu_read_lock();
dp_idx = nla_get_u32((info->attrs[DP_GENL_A_DP_IDX]));
dp = dp_get(dp_idx);
if (!dp)
err = -ENOENT;
else {
void *data;
ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!ans_skb) {
err = -ENOMEM;
goto err;
}
data = genlmsg_put_reply(ans_skb, info, &dp_genl_family,
0, DP_GENL_C_QUERY_DP);
if (data == NULL) {
err = -ENOMEM;
goto err;
}
NLA_PUT_U32(ans_skb, DP_GENL_A_DP_IDX, dp_idx);
NLA_PUT_U32(ans_skb, DP_GENL_A_MC_GROUP, mc_group.id);
genlmsg_end(ans_skb, data);
err = genlmsg_reply(ans_skb, info);
if (!err)
ans_skb = NULL;
}
err:
nla_put_failure:
if (ans_skb)
kfree_skb(ans_skb);
rcu_read_unlock();
return err;
}
/*
* Fill flow entry for nl flow query. Called with rcu_lock
*
*/
static
int
dp_fill_flow(struct ofp_flow_mod* ofm, struct swt_iterator* iter)
{
ofm->header.version = OFP_VERSION;
ofm->header.type = OFPT_FLOW_MOD;
ofm->header.length = htons(sizeof(struct ofp_flow_mod)
+ sizeof(ofm->actions[0]));
ofm->header.xid = htonl(0);
ofm->match.wildcards = htons(iter->flow->key.wildcards);
ofm->match.in_port = iter->flow->key.in_port;
ofm->match.dl_vlan = iter->flow->key.dl_vlan;
memcpy(ofm->match.dl_src, iter->flow->key.dl_src, ETH_ALEN);
memcpy(ofm->match.dl_dst, iter->flow->key.dl_dst, ETH_ALEN);
ofm->match.dl_type = iter->flow->key.dl_type;
ofm->match.nw_src = iter->flow->key.nw_src;
ofm->match.nw_dst = iter->flow->key.nw_dst;
ofm->match.nw_proto = iter->flow->key.nw_proto;
ofm->match.tp_src = iter->flow->key.tp_src;
ofm->match.tp_dst = iter->flow->key.tp_dst;
ofm->group_id = iter->flow->group_id;
ofm->max_idle = iter->flow->max_idle;
/* TODO support multiple actions */
ofm->actions[0] = iter->flow->actions[0];
return 0;
}
static int dp_genl_show(struct sk_buff *skb, struct genl_info *info)
{
struct datapath *dp;
int err = -ENOMEM;
struct sk_buff *ans_skb = NULL;
void *data;
struct nlattr *attr;
struct ofp_data_hello *odh;
size_t odh_max_len, odh_len, port_max_len, len;
int port_count;
if (!info->attrs[DP_GENL_A_DP_IDX])
return -EINVAL;
mutex_lock(&dp_mutex);
dp = dp_get(nla_get_u32((info->attrs[DP_GENL_A_DP_IDX])));
if (!dp)
goto error;
/* Overallocate, since we can't reliably determine the number of
* ports a priori. */
port_max_len = sizeof(struct ofp_phy_port) * OFPP_MAX;
len = nla_total_size(sizeof(*odh) + port_max_len)
+ nla_total_size(sizeof(uint32_t));
ans_skb = nlmsg_new(len, GFP_KERNEL);
if (!ans_skb)
goto error;
data = genlmsg_put_reply(ans_skb, info, &dp_genl_family,
0, DP_GENL_C_SHOW_DP);
if (data == NULL)
goto error;
NLA_PUT_U32(ans_skb, DP_GENL_A_DP_IDX, dp->dp_idx);
odh_max_len = sizeof(*odh) + port_max_len;
attr = nla_reserve(ans_skb, DP_GENL_A_DP_INFO, odh_max_len);
if (!attr)
goto error;
odh = nla_data(attr);
port_count = fill_data_hello(dp, odh);
/* Only now that we know how many ports we've added can we say
* say something about the length. */
odh_len = sizeof(*odh) + (sizeof(struct ofp_phy_port) * port_count);
odh->header.length = htons(odh_len);
/* Take back the unused part that was reserved */
nla_unreserve(ans_skb, attr, (odh_max_len - odh_len));
genlmsg_end(ans_skb, data);
err = genlmsg_reply(ans_skb, info);
if (!err)
ans_skb = NULL;
error:
nla_put_failure:
if (ans_skb)
kfree_skb(ans_skb);
mutex_unlock(&dp_mutex);
return err;
}
static struct genl_ops dp_genl_ops_show_dp = {
.cmd = DP_GENL_C_SHOW_DP,
.flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
.policy = dp_genl_policy,
.doit = dp_genl_show,
.dumpit = NULL,
};
/* Convenience function */
static
void*
dp_init_nl_flow_msg(uint32_t dp_idx, uint16_t table_idx,
struct genl_info *info, struct sk_buff* skb)
{
void* data;
data = genlmsg_put_reply(skb, info, &dp_genl_family, 0,
DP_GENL_C_QUERY_FLOW);
if (data == NULL)
return NULL;
NLA_PUT_U32(skb, DP_GENL_A_DP_IDX, dp_idx);
NLA_PUT_U16(skb, DP_GENL_A_TABLEIDX, table_idx);
return data;
nla_put_failure:
return NULL;
}
/* Iterate through the specified table and send all flow entries over
* netlink to userspace. Each flow message has the following format:
*
* 32bit dpix
* 16bit tabletype
* 32bit number of flows
* openflow-flow-entries
*
* The full table may require multiple messages. A message with 0 flows
* signifies end-of message.
*/
static
int
dp_dump_table(struct datapath *dp, uint16_t table_idx, struct genl_info *info, struct ofp_flow_mod* matchme)
{
struct sk_buff *skb = 0;
struct sw_table *table = 0;
struct swt_iterator iter;
struct sw_flow_key in_flow;
struct nlattr *attr;
int count = 0, sum_count = 0;
void *data;
uint8_t* ofm_ptr = 0;
struct nlattr *num_attr;
int err = -ENOMEM;
table = dp->chain->tables[table_idx];
if ( table == NULL ) {
dprintk("dp::dp_dump_table error, non-existant table at position %d\n", table_idx);
return -EINVAL;
}
if (!table->iterator(table, &iter)) {
dprintk("dp::dp_dump_table couldn't initialize empty table iterator\n");
return -ENOMEM;
}
while (iter.flow) {
/* verify that we can fit all NL_FLOWS_PER_MESSAGE in a single
* sk_buf */
if( (sizeof(dp_genl_family) + sizeof(uint32_t) + sizeof(uint16_t) + sizeof(uint32_t) +
(NL_FLOWS_PER_MESSAGE * sizeof(struct ofp_flow_mod))) > (8192 - 64)){
dprintk("dp::dp_dump_table NL_FLOWS_PER_MESSAGE may cause overrun in skbuf\n");
return -ENOMEM;
}
skb = nlmsg_new(8192 - 64, GFP_ATOMIC);
if (skb == NULL) {
return -ENOMEM;
}
data = dp_init_nl_flow_msg(dp->dp_idx, table_idx, info, skb);
if (data == NULL){
err= -ENOMEM;
goto error_free_skb;
}
/* reserve space to put the number of flows for this message, to
* be filled after the loop*/
num_attr = nla_reserve(skb, DP_GENL_A_NUMFLOWS, sizeof(uint32_t));
if(!num_attr){
err = -ENOMEM;
goto error_free_skb;
}
/* Only load NL_FLOWS_PER_MESSAGE flows at a time */
attr = nla_reserve(skb, DP_GENL_A_FLOW,
(sizeof(struct ofp_flow_mod) + sizeof(struct ofp_action)) * NL_FLOWS_PER_MESSAGE);
if (!attr){
err = -ENOMEM;
goto error_free_skb;
}
/* internal loop to fill NL_FLOWS_PER_MESSAGE flows */
ofm_ptr = nla_data(attr);
flow_extract_match(&in_flow, &matchme->match);
while (iter.flow && count < NL_FLOWS_PER_MESSAGE) {
if(flow_matches(&in_flow, &iter.flow->key)){
if((err = dp_fill_flow((struct ofp_flow_mod*)ofm_ptr, &iter)))
goto error_free_skb;
count++;
/* TODO support multiple actions */
ofm_ptr += sizeof(struct ofp_flow_mod) + sizeof(struct ofp_action);
}
table->iterator_next(&iter);
}
*((uint32_t*)nla_data(num_attr)) = count;
genlmsg_end(skb, data);
sum_count += count;
count = 0;
err = genlmsg_unicast(skb, info->snd_pid);
skb = 0;
}
/* send a sentinal message saying we're done */
skb = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
if (skb == NULL) {
return -ENOMEM;
}
data = dp_init_nl_flow_msg(dp->dp_idx, table_idx, info, skb);
if (data == NULL){
err= -ENOMEM;
goto error_free_skb;
}
NLA_PUT_U32(skb, DP_GENL_A_NUMFLOWS, 0);
/* dummy flow so nl doesn't complain */
attr = nla_reserve(skb, DP_GENL_A_FLOW, sizeof(struct ofp_flow_mod));
if (!attr){
err = -ENOMEM;
goto error_free_skb;
}
genlmsg_end(skb, data);
err = genlmsg_reply(skb, info); skb = 0;
nla_put_failure:
error_free_skb:
if(skb)
kfree_skb(skb);
return err;
}
/* Helper function to query_table which creates and sends a message packed with
* table stats. Message form is:
*
* u32 DP_IDX
* u32 NUM_TABLES
* OFP_TABLE (list of OFP_TABLES)
*
*/
static
int
dp_dump_table_stats(struct datapath *dp, int dp_idx, struct genl_info *info)
{
struct sk_buff *skb = 0;
struct ofp_table *ot = 0;
struct nlattr *attr;
struct sw_table_stats stats;
void *data;
int err = -ENOMEM;
int i = 0;
int nt = dp->chain->n_tables;
/* u32 IDX, u32 NUMTABLES, list-of-tables */
skb = nlmsg_new(4 + 4 + (sizeof(struct ofp_table) * nt), GFP_ATOMIC);
if (skb == NULL) {
return -ENOMEM;
}
data = genlmsg_put_reply(skb, info, &dp_genl_family, 0,
DP_GENL_C_QUERY_TABLE);
if (data == NULL){
return -ENOMEM;
}
NLA_PUT_U32(skb, DP_GENL_A_DP_IDX, dp_idx);
NLA_PUT_U32(skb, DP_GENL_A_NUMTABLES, nt);
/* ... we assume that all tables can fit in a single message.
* Probably a reasonable assumption seeing that we only have
* 3 atm */
attr = nla_reserve(skb, DP_GENL_A_TABLE, (sizeof(struct ofp_table) * nt));
if (!attr){
err = -ENOMEM;
goto error_free_skb;
}
ot = nla_data(attr);
for (i = 0; i < nt; ++i) {
dp->chain->tables[i]->stats(dp->chain->tables[i], &stats);
ot->header.version = OFP_VERSION;
ot->header.type = OFPT_TABLE;
ot->header.length = htons(sizeof(struct ofp_table));
ot->header.xid = htonl(0);
strncpy(ot->name, stats.name, OFP_MAX_TABLE_NAME_LEN);
ot->table_id = htons(i);
ot->n_flows = htonl(stats.n_flows);
ot->max_flows = htonl(stats.max_flows);
ot++;
}
genlmsg_end(skb, data);
err = genlmsg_reply(skb, info); skb = 0;
nla_put_failure:
error_free_skb:
if(skb)
kfree_skb(skb);
return err;
}
/*
* Queries a datapath for flow-table statistics
*/
static int dp_genl_table_query(struct sk_buff *skb, struct genl_info *info)
{
struct datapath* dp;
int err = 0;
if (!info->attrs[DP_GENL_A_DP_IDX]) {
dprintk("dp::dp_genl_table_query received message with missing attributes\n");
return -EINVAL;
}
rcu_read_lock();
dp = dp_get(nla_get_u32(info->attrs[DP_GENL_A_DP_IDX]));
if (!dp) {
err = -ENOENT;
goto err_out;
}
err = dp_dump_table_stats(dp, nla_get_u32(info->attrs[DP_GENL_A_DP_IDX]), info);
err_out:
rcu_read_unlock();
return err;
}
/*
* Queries a datapath for flow-table entries.
*/
static int dp_genl_flow_query(struct sk_buff *skb, struct genl_info *info)
{
struct datapath* dp;
struct ofp_flow_mod* ofm;
u16 table_idx;
int err = 0;
if (!info->attrs[DP_GENL_A_DP_IDX]
|| !info->attrs[DP_GENL_A_TABLEIDX]
|| !info->attrs[DP_GENL_A_FLOW]) {
dprintk("dp::dp_genl_flow_query received message with missing attributes\n");
return -EINVAL;
}
rcu_read_lock();
dp = dp_get(nla_get_u32(info->attrs[DP_GENL_A_DP_IDX]));
if (!dp) {
err = -ENOENT;
goto err_out;
}
table_idx = nla_get_u16(info->attrs[DP_GENL_A_TABLEIDX]);
if (dp->chain->n_tables <= table_idx){
printk("table index %d invalid (dp has %d tables)\n",
table_idx, dp->chain->n_tables);
err = -EINVAL;
goto err_out;
}
ofm = nla_data(info->attrs[DP_GENL_A_FLOW]);
err = dp_dump_table(dp, table_idx, info, ofm);
err_out:
rcu_read_unlock();
return err;
}
static struct nla_policy dp_genl_flow_policy[DP_GENL_A_MAX + 1] = {
[DP_GENL_A_DP_IDX] = { .type = NLA_U32 },
[DP_GENL_A_TABLEIDX] = { .type = NLA_U16 },
[DP_GENL_A_NUMFLOWS] = { .type = NLA_U32 },
};
static struct genl_ops dp_genl_ops_query_flow = {
.cmd = DP_GENL_C_QUERY_FLOW,
.flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
.policy = dp_genl_flow_policy,
.doit = dp_genl_flow_query,
.dumpit = NULL,
};
static struct nla_policy dp_genl_table_policy[DP_GENL_A_MAX + 1] = {
[DP_GENL_A_DP_IDX] = { .type = NLA_U32 },
};
static struct genl_ops dp_genl_ops_query_table = {
.cmd = DP_GENL_C_QUERY_TABLE,
.flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
.policy = dp_genl_table_policy,
.doit = dp_genl_table_query,
.dumpit = NULL,
};
static struct genl_ops dp_genl_ops_query_dp = {
.cmd = DP_GENL_C_QUERY_DP,
.flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
.policy = dp_genl_policy,
.doit = dp_genl_query,
.dumpit = NULL,
};
static int dp_genl_add_del_port(struct sk_buff *skb, struct genl_info *info)
{
struct datapath *dp;
struct net_device *port;
int err;
if (!info->attrs[DP_GENL_A_DP_IDX] || !info->attrs[DP_GENL_A_PORTNAME])
return -EINVAL;
/* Get datapath. */
mutex_lock(&dp_mutex);
dp = dp_get(nla_get_u32(info->attrs[DP_GENL_A_DP_IDX]));
if (!dp) {
err = -ENOENT;
goto out;
}
/* Get interface to add/remove. */
port = dev_get_by_name(&init_net,
nla_data(info->attrs[DP_GENL_A_PORTNAME]));
if (!port) {
err = -ENOENT;
goto out;
}
/* Execute operation. */
if (info->genlhdr->cmd == DP_GENL_C_ADD_PORT)
err = add_switch_port(dp, port);
else {
if (port->br_port == NULL || port->br_port->dp != dp) {
err = -ENOENT;
goto out_put;
}
err = del_switch_port(port->br_port);
}
out_put:
dev_put(port);
out:
mutex_unlock(&dp_mutex);
return err;
}
static struct genl_ops dp_genl_ops_add_port = {
.cmd = DP_GENL_C_ADD_PORT,
.flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
.policy = dp_genl_policy,
.doit = dp_genl_add_del_port,
.dumpit = NULL,
};
static struct genl_ops dp_genl_ops_del_port = {
.cmd = DP_GENL_C_DEL_PORT,
.flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
.policy = dp_genl_policy,
.doit = dp_genl_add_del_port,
.dumpit = NULL,
};
static int dp_genl_openflow(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr *va = info->attrs[DP_GENL_A_OPENFLOW];
struct datapath *dp;
int err;
if (!info->attrs[DP_GENL_A_DP_IDX] || !va)
return -EINVAL;
rcu_read_lock();
dp = dp_get(nla_get_u32(info->attrs[DP_GENL_A_DP_IDX]));
if (!dp) {
err = -ENOENT;
goto out;
}
va = info->attrs[DP_GENL_A_OPENFLOW];
err = fwd_control_input(dp->chain, nla_data(va), nla_len(va));
out:
rcu_read_unlock();
return err;
}
static struct nla_policy dp_genl_openflow_policy[DP_GENL_A_MAX + 1] = {
[DP_GENL_A_DP_IDX] = { .type = NLA_U32 },
};
static struct genl_ops dp_genl_ops_openflow = {
.cmd = DP_GENL_C_OPENFLOW,
.flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
.policy = dp_genl_openflow_policy,
.doit = dp_genl_openflow,
.dumpit = NULL,
};
static struct nla_policy dp_genl_benchmark_policy[DP_GENL_A_MAX + 1] = {
[DP_GENL_A_DP_IDX] = { .type = NLA_U32 },
[DP_GENL_A_NPACKETS] = { .type = NLA_U32 },
[DP_GENL_A_PSIZE] = { .type = NLA_U32 },
};
static struct genl_ops dp_genl_ops_benchmark_nl = {
.cmd = DP_GENL_C_BENCHMARK_NL,
.flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
.policy = dp_genl_benchmark_policy,
.doit = dp_genl_benchmark_nl,
.dumpit = NULL,
};
static struct genl_ops *dp_genl_all_ops[] = {
/* Keep this operation first. Generic Netlink dispatching
* looks up operations with linear search, so we want it at the
* front. */
&dp_genl_ops_openflow,
&dp_genl_ops_query_flow,
&dp_genl_ops_query_table,
&dp_genl_ops_show_dp,
&dp_genl_ops_add_dp,
&dp_genl_ops_del_dp,
&dp_genl_ops_query_dp,
&dp_genl_ops_add_port,
&dp_genl_ops_del_port,
&dp_genl_ops_benchmark_nl,
};
static int dp_init_netlink(void)
{
int err;
int i;
err = genl_register_family(&dp_genl_family);
if (err)
return err;
for (i = 0; i < ARRAY_SIZE(dp_genl_all_ops); i++) {
err = genl_register_ops(&dp_genl_family, dp_genl_all_ops[i]);
if (err)
goto err_unregister;
}
strcpy(mc_group.name, "openflow");
err = genl_register_mc_group(&dp_genl_family, &mc_group);
if (err < 0)
goto err_unregister;
return 0;
err_unregister:
genl_unregister_family(&dp_genl_family);
return err;
}
static void dp_uninit_netlink(void)
{
genl_unregister_family(&dp_genl_family);
}
#define DRV_NAME "openflow"
#define DRV_VERSION VERSION
#define DRV_DESCRIPTION "OpenFlow switching datapath implementation"
#define DRV_COPYRIGHT "Copyright (c) 2007, 2008 The Board of Trustees of The Leland Stanford Junior University"
static int __init dp_init(void)
{
int err;
printk(KERN_INFO DRV_NAME ": " DRV_DESCRIPTION "\n");
printk(KERN_INFO DRV_NAME ": " VERSION" built on "__DATE__" "__TIME__"\n");
printk(KERN_INFO DRV_NAME ": " DRV_COPYRIGHT "\n");
err = flow_init();
if (err)
goto error;
err = dp_init_netlink();
if (err)
goto error_flow_exit;
/* Hook into callback used by the bridge to intercept packets.
* Parasites we are. */
if (br_handle_frame_hook)
printk("openflow: hijacking bridge hook\n");
br_handle_frame_hook = dp_frame_hook;
return 0;
error_flow_exit:
flow_exit();
error:
printk(KERN_EMERG "openflow: failed to install!");
return err;
}
static void dp_cleanup(void)
{
fwd_exit();
dp_uninit_netlink();
flow_exit();
br_handle_frame_hook = NULL;
}
module_init(dp_init);
module_exit(dp_cleanup);
MODULE_DESCRIPTION(DRV_DESCRIPTION);
MODULE_AUTHOR(DRV_COPYRIGHT);
MODULE_LICENSE("GPL");
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