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openvswitch/datapath/datapath.c
Jesse Gross dad80ec308 datapath: dp_sysfs_add_dp() needs RTNL lock. 
We currently drop RTNL before adding a new datapath to sysfs but
then access the dp data structures.  This moves the call to
dp_sysfs_add_dp() before we drop the locks to prevent a potential
race.  All other calls to sysfs functions already hold RTNL.

Found with lockdep.

Signed-off-by: Jesse Gross <jesse@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>
2010-12-09 17:43:37 -08:00

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/*
* Copyright (c) 2007, 2008, 2009, 2010 Nicira Networks.
* Distributed under the terms of the GNU GPL version 2.
*
* Significant portions of this file may be copied from parts of the Linux
* kernel, by Linus Torvalds and others.
*/
/* Functions for managing the dp interface/device. */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/init.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/if_arp.h>
#include <linux/if_vlan.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/delay.h>
#include <linux/time.h>
#include <linux/etherdevice.h>
#include <linux/kernel.h>
#include <linux/kthread.h>
#include <linux/mutex.h>
#include <linux/percpu.h>
#include <linux/rcupdate.h>
#include <linux/tcp.h>
#include <linux/udp.h>
#include <linux/version.h>
#include <linux/ethtool.h>
#include <linux/wait.h>
#include <asm/system.h>
#include <asm/div64.h>
#include <asm/bug.h>
#include <linux/highmem.h>
#include <linux/netfilter_bridge.h>
#include <linux/netfilter_ipv4.h>
#include <linux/inetdevice.h>
#include <linux/list.h>
#include <linux/rculist.h>
#include <linux/dmi.h>
#include <net/inet_ecn.h>
#include <linux/compat.h>
#include "openvswitch/datapath-protocol.h"
#include "checksum.h"
#include "datapath.h"
#include "actions.h"
#include "flow.h"
#include "loop_counter.h"
#include "odp-compat.h"
#include "table.h"
#include "vport-internal_dev.h"
#include "compat.h"
int (*dp_ioctl_hook)(struct net_device *dev, struct ifreq *rq, int cmd);
EXPORT_SYMBOL(dp_ioctl_hook);
/* Datapaths. Protected on the read side by rcu_read_lock, on the write side
* by dp_mutex.
*
* dp_mutex nests inside the RTNL lock: if you need both you must take the RTNL
* lock first.
*
* It is safe to access the datapath and vport structures with just
* dp_mutex.
*/
static struct datapath *dps[ODP_MAX];
static DEFINE_MUTEX(dp_mutex);
static int new_vport(struct datapath *, struct odp_port *, int port_no);
/* Must be called with rcu_read_lock or dp_mutex. */
struct datapath *get_dp(int dp_idx)
{
if (dp_idx < 0 || dp_idx >= ODP_MAX)
return NULL;
return rcu_dereference(dps[dp_idx]);
}
EXPORT_SYMBOL_GPL(get_dp);
static struct datapath *get_dp_locked(int dp_idx)
{
struct datapath *dp;
mutex_lock(&dp_mutex);
dp = get_dp(dp_idx);
if (dp)
mutex_lock(&dp->mutex);
mutex_unlock(&dp_mutex);
return dp;
}
/* Must be called with rcu_read_lock or RTNL lock. */
const char *dp_name(const struct datapath *dp)
{
return vport_get_name(dp->ports[ODPP_LOCAL]);
}
static inline size_t br_nlmsg_size(void)
{
return NLMSG_ALIGN(sizeof(struct ifinfomsg))
+ nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
+ nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
+ nla_total_size(4) /* IFLA_MASTER */
+ nla_total_size(4) /* IFLA_MTU */
+ nla_total_size(4) /* IFLA_LINK */
+ nla_total_size(1); /* IFLA_OPERSTATE */
}
static int dp_fill_ifinfo(struct sk_buff *skb,
const struct vport *port,
int event, unsigned int flags)
{
const struct datapath *dp = port->dp;
int ifindex = vport_get_ifindex(port);
int iflink = vport_get_iflink(port);
struct ifinfomsg *hdr;
struct nlmsghdr *nlh;
if (ifindex < 0)
return ifindex;
if (iflink < 0)
return iflink;
nlh = nlmsg_put(skb, 0, 0, event, sizeof(*hdr), flags);
if (nlh == NULL)
return -EMSGSIZE;
hdr = nlmsg_data(nlh);
hdr->ifi_family = AF_BRIDGE;
hdr->__ifi_pad = 0;
hdr->ifi_type = ARPHRD_ETHER;
hdr->ifi_index = ifindex;
hdr->ifi_flags = vport_get_flags(port);
hdr->ifi_change = 0;
NLA_PUT_STRING(skb, IFLA_IFNAME, vport_get_name(port));
NLA_PUT_U32(skb, IFLA_MASTER, vport_get_ifindex(dp->ports[ODPP_LOCAL]));
NLA_PUT_U32(skb, IFLA_MTU, vport_get_mtu(port));
#ifdef IFLA_OPERSTATE
NLA_PUT_U8(skb, IFLA_OPERSTATE,
vport_is_running(port)
? vport_get_operstate(port)
: IF_OPER_DOWN);
#endif
NLA_PUT(skb, IFLA_ADDRESS, ETH_ALEN, vport_get_addr(port));
if (ifindex != iflink)
NLA_PUT_U32(skb, IFLA_LINK,iflink);
return nlmsg_end(skb, nlh);
nla_put_failure:
nlmsg_cancel(skb, nlh);
return -EMSGSIZE;
}
static void dp_ifinfo_notify(int event, struct vport *port)
{
struct sk_buff *skb;
int err = -ENOBUFS;
skb = nlmsg_new(br_nlmsg_size(), GFP_KERNEL);
if (skb == NULL)
goto errout;
err = dp_fill_ifinfo(skb, port, event, 0);
if (err < 0) {
/* -EMSGSIZE implies BUG in br_nlmsg_size() */
WARN_ON(err == -EMSGSIZE);
kfree_skb(skb);
goto errout;
}
rtnl_notify(skb, &init_net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
return;
errout:
if (err < 0)
rtnl_set_sk_err(&init_net, RTNLGRP_LINK, err);
}
static void release_dp(struct kobject *kobj)
{
struct datapath *dp = container_of(kobj, struct datapath, ifobj);
kfree(dp);
}
static struct kobj_type dp_ktype = {
.release = release_dp
};
static int create_dp(int dp_idx, const char __user *devnamep)
{
struct odp_port internal_dev_port;
char devname[IFNAMSIZ];
struct datapath *dp;
int err;
int i;
if (devnamep) {
int retval = strncpy_from_user(devname, devnamep, IFNAMSIZ);
if (retval < 0) {
err = -EFAULT;
goto err;
} else if (retval >= IFNAMSIZ) {
err = -ENAMETOOLONG;
goto err;
}
} else {
snprintf(devname, sizeof devname, "of%d", dp_idx);
}
rtnl_lock();
mutex_lock(&dp_mutex);
err = -ENODEV;
if (!try_module_get(THIS_MODULE))
goto err_unlock;
/* Exit early if a datapath with that number already exists.
* (We don't use -EEXIST because that's ambiguous with 'devname'
* conflicting with an existing network device name.) */
err = -EBUSY;
if (get_dp(dp_idx))
goto err_put_module;
err = -ENOMEM;
dp = kzalloc(sizeof *dp, GFP_KERNEL);
if (dp == NULL)
goto err_put_module;
INIT_LIST_HEAD(&dp->port_list);
mutex_init(&dp->mutex);
dp->dp_idx = dp_idx;
for (i = 0; i < DP_N_QUEUES; i++)
skb_queue_head_init(&dp->queues[i]);
init_waitqueue_head(&dp->waitqueue);
/* Initialize kobject for bridge. This will be added as
* /sys/class/net/<devname>/brif later, if sysfs is enabled. */
dp->ifobj.kset = NULL;
kobject_init(&dp->ifobj, &dp_ktype);
/* Allocate table. */
err = -ENOMEM;
rcu_assign_pointer(dp->table, tbl_create(0));
if (!dp->table)
goto err_free_dp;
/* Set up our datapath device. */
BUILD_BUG_ON(sizeof(internal_dev_port.devname) != sizeof(devname));
strcpy(internal_dev_port.devname, devname);
strcpy(internal_dev_port.type, "internal");
err = new_vport(dp, &internal_dev_port, ODPP_LOCAL);
if (err) {
if (err == -EBUSY)
err = -EEXIST;
goto err_destroy_table;
}
dp->drop_frags = 0;
dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
if (!dp->stats_percpu)
goto err_destroy_local_port;
rcu_assign_pointer(dps[dp_idx], dp);
dp_sysfs_add_dp(dp);
mutex_unlock(&dp_mutex);
rtnl_unlock();
return 0;
err_destroy_local_port:
dp_detach_port(dp->ports[ODPP_LOCAL]);
err_destroy_table:
tbl_destroy(dp->table, NULL);
err_free_dp:
kfree(dp);
err_put_module:
module_put(THIS_MODULE);
err_unlock:
mutex_unlock(&dp_mutex);
rtnl_unlock();
err:
return err;
}
static void do_destroy_dp(struct datapath *dp)
{
struct vport *p, *n;
int i;
list_for_each_entry_safe (p, n, &dp->port_list, node)
if (p->port_no != ODPP_LOCAL)
dp_detach_port(p);
dp_sysfs_del_dp(dp);
rcu_assign_pointer(dps[dp->dp_idx], NULL);
dp_detach_port(dp->ports[ODPP_LOCAL]);
tbl_destroy(dp->table, flow_free_tbl);
for (i = 0; i < DP_N_QUEUES; i++)
skb_queue_purge(&dp->queues[i]);
free_percpu(dp->stats_percpu);
kobject_put(&dp->ifobj);
module_put(THIS_MODULE);
}
static int destroy_dp(int dp_idx)
{
struct datapath *dp;
int err;
rtnl_lock();
mutex_lock(&dp_mutex);
dp = get_dp(dp_idx);
err = -ENODEV;
if (!dp)
goto err_unlock;
do_destroy_dp(dp);
err = 0;
err_unlock:
mutex_unlock(&dp_mutex);
rtnl_unlock();
return err;
}
/* Called with RTNL lock and dp_mutex. */
static int new_vport(struct datapath *dp, struct odp_port *odp_port, int port_no)
{
struct vport_parms parms;
struct vport *vport;
parms.name = odp_port->devname;
parms.type = odp_port->type;
parms.config = odp_port->config;
parms.dp = dp;
parms.port_no = port_no;
vport_lock();
vport = vport_add(&parms);
vport_unlock();
if (IS_ERR(vport))
return PTR_ERR(vport);
rcu_assign_pointer(dp->ports[port_no], vport);
list_add_rcu(&vport->node, &dp->port_list);
dp->n_ports++;
dp_ifinfo_notify(RTM_NEWLINK, vport);
return 0;
}
static int attach_port(int dp_idx, struct odp_port __user *portp)
{
struct datapath *dp;
struct odp_port port;
int port_no;
int err;
err = -EFAULT;
if (copy_from_user(&port, portp, sizeof port))
goto out;
port.devname[IFNAMSIZ - 1] = '\0';
port.type[VPORT_TYPE_SIZE - 1] = '\0';
rtnl_lock();
dp = get_dp_locked(dp_idx);
err = -ENODEV;
if (!dp)
goto out_unlock_rtnl;
for (port_no = 1; port_no < DP_MAX_PORTS; port_no++)
if (!dp->ports[port_no])
goto got_port_no;
err = -EFBIG;
goto out_unlock_dp;
got_port_no:
err = new_vport(dp, &port, port_no);
if (err)
goto out_unlock_dp;
set_internal_devs_mtu(dp);
dp_sysfs_add_if(dp->ports[port_no]);
err = put_user(port_no, &portp->port);
out_unlock_dp:
mutex_unlock(&dp->mutex);
out_unlock_rtnl:
rtnl_unlock();
out:
return err;
}
int dp_detach_port(struct vport *p)
{
int err;
ASSERT_RTNL();
if (p->port_no != ODPP_LOCAL)
dp_sysfs_del_if(p);
dp_ifinfo_notify(RTM_DELLINK, p);
/* First drop references to device. */
p->dp->n_ports--;
list_del_rcu(&p->node);
rcu_assign_pointer(p->dp->ports[p->port_no], NULL);
/* Then destroy it. */
vport_lock();
err = vport_del(p);
vport_unlock();
return err;
}
static int detach_port(int dp_idx, int port_no)
{
struct vport *p;
struct datapath *dp;
int err;
err = -EINVAL;
if (port_no < 0 || port_no >= DP_MAX_PORTS || port_no == ODPP_LOCAL)
goto out;
rtnl_lock();
dp = get_dp_locked(dp_idx);
err = -ENODEV;
if (!dp)
goto out_unlock_rtnl;
p = dp->ports[port_no];
err = -ENOENT;
if (!p)
goto out_unlock_dp;
err = dp_detach_port(p);
out_unlock_dp:
mutex_unlock(&dp->mutex);
out_unlock_rtnl:
rtnl_unlock();
out:
return err;
}
/* Must be called with rcu_read_lock. */
void dp_process_received_packet(struct vport *p, struct sk_buff *skb)
{
struct datapath *dp = p->dp;
struct dp_stats_percpu *stats;
int stats_counter_off;
struct sw_flow_actions *acts;
struct loop_counter *loop;
int error;
OVS_CB(skb)->vport = p;
if (!OVS_CB(skb)->flow) {
struct odp_flow_key key;
struct tbl_node *flow_node;
bool is_frag;
/* Extract flow from 'skb' into 'key'. */
error = flow_extract(skb, p ? p->port_no : ODPP_NONE, &key, &is_frag);
if (unlikely(error)) {
kfree_skb(skb);
return;
}
if (is_frag && dp->drop_frags) {
kfree_skb(skb);
stats_counter_off = offsetof(struct dp_stats_percpu, n_frags);
goto out;
}
/* Look up flow. */
flow_node = tbl_lookup(rcu_dereference(dp->table), &key,
flow_hash(&key), flow_cmp);
if (unlikely(!flow_node)) {
dp_output_control(dp, skb, _ODPL_MISS_NR, OVS_CB(skb)->tun_id);
stats_counter_off = offsetof(struct dp_stats_percpu, n_missed);
goto out;
}
OVS_CB(skb)->flow = flow_cast(flow_node);
}
flow_used(OVS_CB(skb)->flow, skb);
acts = rcu_dereference(OVS_CB(skb)->flow->sf_acts);
/* Check whether we've looped too much. */
loop = loop_get_counter();
if (unlikely(++loop->count > MAX_LOOPS))
loop->looping = true;
if (unlikely(loop->looping)) {
loop_suppress(dp, acts);
goto out_loop;
}
/* Execute actions. */
execute_actions(dp, skb, &OVS_CB(skb)->flow->key, acts->actions,
acts->n_actions);
stats_counter_off = offsetof(struct dp_stats_percpu, n_hit);
/* Check whether sub-actions looped too much. */
if (unlikely(loop->looping))
loop_suppress(dp, acts);
out_loop:
/* Decrement loop counter. */
if (!--loop->count)
loop->looping = false;
loop_put_counter();
out:
/* Update datapath statistics. */
local_bh_disable();
stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
write_seqcount_begin(&stats->seqlock);
(*(u64 *)((u8 *)stats + stats_counter_off))++;
write_seqcount_end(&stats->seqlock);
local_bh_enable();
}
/* Append each packet in 'skb' list to 'queue'. There will be only one packet
* unless we broke up a GSO packet. */
static int queue_control_packets(struct sk_buff *skb, struct sk_buff_head *queue,
int queue_no, u32 arg)
{
struct sk_buff *nskb;
int port_no;
int err;
if (OVS_CB(skb)->vport)
port_no = OVS_CB(skb)->vport->port_no;
else
port_no = ODPP_LOCAL;
do {
struct odp_msg *header;
nskb = skb->next;
skb->next = NULL;
err = skb_cow(skb, sizeof *header);
if (err)
goto err_kfree_skbs;
header = (struct odp_msg*)__skb_push(skb, sizeof *header);
header->type = queue_no;
header->length = skb->len;
header->port = port_no;
header->reserved = 0;
header->arg = arg;
skb_queue_tail(queue, skb);
skb = nskb;
} while (skb);
return 0;
err_kfree_skbs:
kfree_skb(skb);
while ((skb = nskb) != NULL) {
nskb = skb->next;
kfree_skb(skb);
}
return err;
}
int dp_output_control(struct datapath *dp, struct sk_buff *skb, int queue_no,
u32 arg)
{
struct dp_stats_percpu *stats;
struct sk_buff_head *queue;
int err;
WARN_ON_ONCE(skb_shared(skb));
BUG_ON(queue_no != _ODPL_MISS_NR && queue_no != _ODPL_ACTION_NR && queue_no != _ODPL_SFLOW_NR);
queue = &dp->queues[queue_no];
err = -ENOBUFS;
if (skb_queue_len(queue) >= DP_MAX_QUEUE_LEN)
goto err_kfree_skb;
forward_ip_summed(skb);
err = vswitch_skb_checksum_setup(skb);
if (err)
goto err_kfree_skb;
/* Break apart GSO packets into their component pieces. Otherwise
* userspace may try to stuff a 64kB packet into a 1500-byte MTU. */
if (skb_is_gso(skb)) {
struct sk_buff *nskb = skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM);
if (nskb) {
kfree_skb(skb);
skb = nskb;
if (unlikely(IS_ERR(skb))) {
err = PTR_ERR(skb);
goto err;
}
} else {
/* XXX This case might not be possible. It's hard to
* tell from the skb_gso_segment() code and comment. */
}
}
err = queue_control_packets(skb, queue, queue_no, arg);
wake_up_interruptible(&dp->waitqueue);
return err;
err_kfree_skb:
kfree_skb(skb);
err:
local_bh_disable();
stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
write_seqcount_begin(&stats->seqlock);
stats->n_lost++;
write_seqcount_end(&stats->seqlock);
local_bh_enable();
return err;
}
static int flush_flows(struct datapath *dp)
{
struct tbl *old_table = rcu_dereference(dp->table);
struct tbl *new_table;
new_table = tbl_create(0);
if (!new_table)
return -ENOMEM;
rcu_assign_pointer(dp->table, new_table);
tbl_deferred_destroy(old_table, flow_free_tbl);
return 0;
}
static int validate_actions(const struct sw_flow_actions *actions)
{
unsigned int i;
for (i = 0; i < actions->n_actions; i++) {
const union odp_action *a = &actions->actions[i];
switch (a->type) {
case ODPAT_CONTROLLER:
case ODPAT_STRIP_VLAN:
case ODPAT_SET_DL_SRC:
case ODPAT_SET_DL_DST:
case ODPAT_SET_NW_SRC:
case ODPAT_SET_NW_DST:
case ODPAT_SET_TP_SRC:
case ODPAT_SET_TP_DST:
case ODPAT_SET_TUNNEL:
case ODPAT_SET_PRIORITY:
case ODPAT_POP_PRIORITY:
case ODPAT_DROP_SPOOFED_ARP:
/* No validation needed. */
break;
case ODPAT_OUTPUT:
if (a->output.port >= DP_MAX_PORTS)
return -EINVAL;
break;
case ODPAT_SET_DL_TCI:
if (a->dl_tci.tci & htons(VLAN_CFI_MASK))
return -EINVAL;
break;
case ODPAT_SET_NW_TOS:
if (a->nw_tos.nw_tos & INET_ECN_MASK)
return -EINVAL;
break;
default:
return -EOPNOTSUPP;
}
}
return 0;
}
static struct sw_flow_actions *get_actions(const struct odp_flow *flow)
{
struct sw_flow_actions *actions;
int error;
actions = flow_actions_alloc(flow->n_actions);
error = PTR_ERR(actions);
if (IS_ERR(actions))
goto error;
error = -EFAULT;
if (copy_from_user(actions->actions, flow->actions,
flow->n_actions * sizeof(union odp_action)))
goto error_free_actions;
error = validate_actions(actions);
if (error)
goto error_free_actions;
return actions;
error_free_actions:
kfree(actions);
error:
return ERR_PTR(error);
}
static void get_stats(struct sw_flow *flow, struct odp_flow_stats *stats)
{
if (flow->used) {
struct timespec offset_ts, used, now_mono;
ktime_get_ts(&now_mono);
jiffies_to_timespec(jiffies - flow->used, &offset_ts);
set_normalized_timespec(&used, now_mono.tv_sec - offset_ts.tv_sec,
now_mono.tv_nsec - offset_ts.tv_nsec);
stats->used_sec = used.tv_sec;
stats->used_nsec = used.tv_nsec;
} else {
stats->used_sec = 0;
stats->used_nsec = 0;
}
stats->n_packets = flow->packet_count;
stats->n_bytes = flow->byte_count;
stats->reserved = 0;
stats->tcp_flags = flow->tcp_flags;
stats->error = 0;
}
static void clear_stats(struct sw_flow *flow)
{
flow->used = 0;
flow->tcp_flags = 0;
flow->packet_count = 0;
flow->byte_count = 0;
}
static int expand_table(struct datapath *dp)
{
struct tbl *old_table = rcu_dereference(dp->table);
struct tbl *new_table;
new_table = tbl_expand(old_table);
if (IS_ERR(new_table))
return PTR_ERR(new_table);
rcu_assign_pointer(dp->table, new_table);
tbl_deferred_destroy(old_table, NULL);
return 0;
}
static int do_put_flow(struct datapath *dp, struct odp_flow_put *uf,
struct odp_flow_stats *stats)
{
struct tbl_node *flow_node;
struct sw_flow *flow;
struct tbl *table;
int error;
table = rcu_dereference(dp->table);
flow_node = tbl_lookup(table, &uf->flow.key, flow_hash(&uf->flow.key), flow_cmp);
if (!flow_node) {
/* No such flow. */
struct sw_flow_actions *acts;
error = -ENOENT;
if (!(uf->flags & ODPPF_CREATE))
goto error;
/* Expand table, if necessary, to make room. */
if (tbl_count(table) >= tbl_n_buckets(table)) {
error = expand_table(dp);
if (error)
goto error;
table = rcu_dereference(dp->table);
}
/* Allocate flow. */
flow = flow_alloc();
if (IS_ERR(flow)) {
error = PTR_ERR(flow);
goto error;
}
flow->key = uf->flow.key;
clear_stats(flow);
/* Obtain actions. */
acts = get_actions(&uf->flow);
error = PTR_ERR(acts);
if (IS_ERR(acts))
goto error_free_flow;
rcu_assign_pointer(flow->sf_acts, acts);
/* Put flow in bucket. */
error = tbl_insert(table, &flow->tbl_node, flow_hash(&flow->key));
if (error)
goto error_free_flow_acts;
memset(stats, 0, sizeof(struct odp_flow_stats));
} else {
/* We found a matching flow. */
struct sw_flow_actions *old_acts, *new_acts;
flow = flow_cast(flow_node);
/* Bail out if we're not allowed to modify an existing flow. */
error = -EEXIST;
if (!(uf->flags & ODPPF_MODIFY))
goto error;
/* Swap actions. */
new_acts = get_actions(&uf->flow);
error = PTR_ERR(new_acts);
if (IS_ERR(new_acts))
goto error;
old_acts = rcu_dereference(flow->sf_acts);
if (old_acts->n_actions != new_acts->n_actions ||
memcmp(old_acts->actions, new_acts->actions,
sizeof(union odp_action) * old_acts->n_actions)) {
rcu_assign_pointer(flow->sf_acts, new_acts);
flow_deferred_free_acts(old_acts);
} else {
kfree(new_acts);
}
/* Fetch stats, then clear them if necessary. */
spin_lock_bh(&flow->lock);
get_stats(flow, stats);
if (uf->flags & ODPPF_ZERO_STATS)
clear_stats(flow);
spin_unlock_bh(&flow->lock);
}
return 0;
error_free_flow_acts:
kfree(flow->sf_acts);
error_free_flow:
flow->sf_acts = NULL;
flow_put(flow);
error:
return error;
}
static int put_flow(struct datapath *dp, struct odp_flow_put __user *ufp)
{
struct odp_flow_stats stats;
struct odp_flow_put uf;
int error;
if (copy_from_user(&uf, ufp, sizeof(struct odp_flow_put)))
return -EFAULT;
error = do_put_flow(dp, &uf, &stats);
if (error)
return error;
if (copy_to_user(&ufp->flow.stats, &stats,
sizeof(struct odp_flow_stats)))
return -EFAULT;
return 0;
}
static int do_answer_query(struct sw_flow *flow, u32 query_flags,
struct odp_flow_stats __user *ustats,
union odp_action __user *actions,
u32 __user *n_actionsp)
{
struct sw_flow_actions *sf_acts;
struct odp_flow_stats stats;
u32 n_actions;
spin_lock_bh(&flow->lock);
get_stats(flow, &stats);
if (query_flags & ODPFF_ZERO_TCP_FLAGS)
flow->tcp_flags = 0;
spin_unlock_bh(&flow->lock);
if (copy_to_user(ustats, &stats, sizeof(struct odp_flow_stats)) ||
get_user(n_actions, n_actionsp))
return -EFAULT;
if (!n_actions)
return 0;
sf_acts = rcu_dereference(flow->sf_acts);
if (put_user(sf_acts->n_actions, n_actionsp) ||
(actions && copy_to_user(actions, sf_acts->actions,
sizeof(union odp_action) *
min(sf_acts->n_actions, n_actions))))
return -EFAULT;
return 0;
}
static int answer_query(struct sw_flow *flow, u32 query_flags,
struct odp_flow __user *ufp)
{
union odp_action *actions;
if (get_user(actions, &ufp->actions))
return -EFAULT;
return do_answer_query(flow, query_flags,
&ufp->stats, actions, &ufp->n_actions);
}
static struct sw_flow *do_del_flow(struct datapath *dp, struct odp_flow_key *key)
{
struct tbl *table = rcu_dereference(dp->table);
struct tbl_node *flow_node;
int error;
flow_node = tbl_lookup(table, key, flow_hash(key), flow_cmp);
if (!flow_node)
return ERR_PTR(-ENOENT);
error = tbl_remove(table, flow_node);
if (error)
return ERR_PTR(error);
/* XXX Returned flow_node's statistics might lose a few packets, since
* other CPUs can be using this flow. We used to synchronize_rcu() to
* make sure that we get completely accurate stats, but that blows our
* performance, badly. */
return flow_cast(flow_node);
}
static int del_flow(struct datapath *dp, struct odp_flow __user *ufp)
{
struct sw_flow *flow;
struct odp_flow uf;
int error;
if (copy_from_user(&uf, ufp, sizeof uf))
return -EFAULT;
flow = do_del_flow(dp, &uf.key);
if (IS_ERR(flow))
return PTR_ERR(flow);
error = answer_query(flow, 0, ufp);
flow_deferred_free(flow);
return error;
}
static int do_query_flows(struct datapath *dp, const struct odp_flowvec *flowvec)
{
struct tbl *table = rcu_dereference(dp->table);
u32 i;
for (i = 0; i < flowvec->n_flows; i++) {
struct odp_flow __user *ufp = &flowvec->flows[i];
struct odp_flow uf;
struct tbl_node *flow_node;
int error;
if (copy_from_user(&uf, ufp, sizeof uf))
return -EFAULT;
flow_node = tbl_lookup(table, &uf.key, flow_hash(&uf.key), flow_cmp);
if (!flow_node)
error = put_user(ENOENT, &ufp->stats.error);
else
error = answer_query(flow_cast(flow_node), uf.flags, ufp);
if (error)
return -EFAULT;
}
return flowvec->n_flows;
}
struct list_flows_cbdata {
struct odp_flow __user *uflows;
u32 n_flows;
u32 listed_flows;
};
static int list_flow(struct tbl_node *node, void *cbdata_)
{
struct sw_flow *flow = flow_cast(node);
struct list_flows_cbdata *cbdata = cbdata_;
struct odp_flow __user *ufp = &cbdata->uflows[cbdata->listed_flows++];
int error;
if (copy_to_user(&ufp->key, &flow->key, sizeof flow->key))
return -EFAULT;
error = answer_query(flow, 0, ufp);
if (error)
return error;
if (cbdata->listed_flows >= cbdata->n_flows)
return cbdata->listed_flows;
return 0;
}
static int do_list_flows(struct datapath *dp, const struct odp_flowvec *flowvec)
{
struct list_flows_cbdata cbdata;
int error;
if (!flowvec->n_flows)
return 0;
cbdata.uflows = flowvec->flows;
cbdata.n_flows = flowvec->n_flows;
cbdata.listed_flows = 0;
error = tbl_foreach(rcu_dereference(dp->table), list_flow, &cbdata);
return error ? error : cbdata.listed_flows;
}
static int do_flowvec_ioctl(struct datapath *dp, unsigned long argp,
int (*function)(struct datapath *,
const struct odp_flowvec *))
{
struct odp_flowvec __user *uflowvec;
struct odp_flowvec flowvec;
int retval;
uflowvec = (struct odp_flowvec __user *)argp;
if (copy_from_user(&flowvec, uflowvec, sizeof flowvec))
return -EFAULT;
if (flowvec.n_flows > INT_MAX / sizeof(struct odp_flow))
return -EINVAL;
retval = function(dp, &flowvec);
return (retval < 0 ? retval
: retval == flowvec.n_flows ? 0
: put_user(retval, &uflowvec->n_flows));
}
static int do_execute(struct datapath *dp, const struct odp_execute *execute)
{
struct odp_flow_key key;
struct sk_buff *skb;
struct sw_flow_actions *actions;
struct ethhdr *eth;
bool is_frag;
int err;
err = -EINVAL;
if (execute->length < ETH_HLEN || execute->length > 65535)
goto error;
actions = flow_actions_alloc(execute->n_actions);
if (IS_ERR(actions)) {
err = PTR_ERR(actions);
goto error;
}
err = -EFAULT;
if (copy_from_user(actions->actions, execute->actions,
execute->n_actions * sizeof *execute->actions))
goto error_free_actions;
err = validate_actions(actions);
if (err)
goto error_free_actions;
err = -ENOMEM;
skb = alloc_skb(execute->length, GFP_KERNEL);
if (!skb)
goto error_free_actions;
err = -EFAULT;
if (copy_from_user(skb_put(skb, execute->length), execute->data,
execute->length))
goto error_free_skb;
skb_reset_mac_header(skb);
eth = eth_hdr(skb);
/* Normally, setting the skb 'protocol' field would be handled by a
* call to eth_type_trans(), but it assumes there's a sending
* device, which we may not have. */
if (ntohs(eth->h_proto) >= 1536)
skb->protocol = eth->h_proto;
else
skb->protocol = htons(ETH_P_802_2);
err = flow_extract(skb, -1, &key, &is_frag);
if (err)
goto error_free_skb;
rcu_read_lock();
err = execute_actions(dp, skb, &key, actions->actions, actions->n_actions);
rcu_read_unlock();
kfree(actions);
return err;
error_free_skb:
kfree_skb(skb);
error_free_actions:
kfree(actions);
error:
return err;
}
static int execute_packet(struct datapath *dp, const struct odp_execute __user *executep)
{
struct odp_execute execute;
if (copy_from_user(&execute, executep, sizeof execute))
return -EFAULT;
return do_execute(dp, &execute);
}
static int get_dp_stats(struct datapath *dp, struct odp_stats __user *statsp)
{
struct tbl *table = rcu_dereference(dp->table);
struct odp_stats stats;
int i;
stats.n_flows = tbl_count(table);
stats.cur_capacity = tbl_n_buckets(table);
stats.max_capacity = TBL_MAX_BUCKETS;
stats.n_ports = dp->n_ports;
stats.max_ports = DP_MAX_PORTS;
stats.n_frags = stats.n_hit = stats.n_missed = stats.n_lost = 0;
for_each_possible_cpu(i) {
const struct dp_stats_percpu *percpu_stats;
struct dp_stats_percpu local_stats;
unsigned seqcount;
percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
do {
seqcount = read_seqcount_begin(&percpu_stats->seqlock);
local_stats = *percpu_stats;
} while (read_seqcount_retry(&percpu_stats->seqlock, seqcount));
stats.n_frags += local_stats.n_frags;
stats.n_hit += local_stats.n_hit;
stats.n_missed += local_stats.n_missed;
stats.n_lost += local_stats.n_lost;
}
stats.max_miss_queue = DP_MAX_QUEUE_LEN;
stats.max_action_queue = DP_MAX_QUEUE_LEN;
return copy_to_user(statsp, &stats, sizeof stats) ? -EFAULT : 0;
}
/* MTU of the dp pseudo-device: ETH_DATA_LEN or the minimum of the ports */
int dp_min_mtu(const struct datapath *dp)
{
struct vport *p;
int mtu = 0;
ASSERT_RTNL();
list_for_each_entry_rcu (p, &dp->port_list, node) {
int dev_mtu;
/* Skip any internal ports, since that's what we're trying to
* set. */
if (is_internal_vport(p))
continue;
dev_mtu = vport_get_mtu(p);
if (!mtu || dev_mtu < mtu)
mtu = dev_mtu;
}
return mtu ? mtu : ETH_DATA_LEN;
}
/* Sets the MTU of all datapath devices to the minimum of the ports. Must
* be called with RTNL lock. */
void set_internal_devs_mtu(const struct datapath *dp)
{
struct vport *p;
int mtu;
ASSERT_RTNL();
mtu = dp_min_mtu(dp);
list_for_each_entry_rcu (p, &dp->port_list, node) {
if (is_internal_vport(p))
vport_set_mtu(p, mtu);
}
}
static int put_port(const struct vport *p, struct odp_port __user *uop)
{
struct odp_port op;
memset(&op, 0, sizeof op);
rcu_read_lock();
strncpy(op.devname, vport_get_name(p), sizeof op.devname);
strncpy(op.type, vport_get_type(p), sizeof op.type);
rcu_read_unlock();
op.port = p->port_no;
return copy_to_user(uop, &op, sizeof op) ? -EFAULT : 0;
}
static int query_port(struct datapath *dp, struct odp_port __user *uport)
{
struct odp_port port;
if (copy_from_user(&port, uport, sizeof port))
return -EFAULT;
if (port.devname[0]) {
struct vport *vport;
int err = 0;
port.devname[IFNAMSIZ - 1] = '\0';
vport_lock();
rcu_read_lock();
vport = vport_locate(port.devname);
if (!vport) {
err = -ENODEV;
goto error_unlock;
}
if (vport->dp != dp) {
err = -ENOENT;
goto error_unlock;
}
port.port = vport->port_no;
error_unlock:
rcu_read_unlock();
vport_unlock();
if (err)
return err;
} else {
if (port.port >= DP_MAX_PORTS)
return -EINVAL;
if (!dp->ports[port.port])
return -ENOENT;
}
return put_port(dp->ports[port.port], uport);
}
static int do_list_ports(struct datapath *dp, struct odp_port __user *uports,
int n_ports)
{
int idx = 0;
if (n_ports) {
struct vport *p;
list_for_each_entry_rcu (p, &dp->port_list, node) {
if (put_port(p, &uports[idx]))
return -EFAULT;
if (idx++ >= n_ports)
break;
}
}
return idx;
}
static int list_ports(struct datapath *dp, struct odp_portvec __user *upv)
{
struct odp_portvec pv;
int retval;
if (copy_from_user(&pv, upv, sizeof pv))
return -EFAULT;
retval = do_list_ports(dp, pv.ports, pv.n_ports);
if (retval < 0)
return retval;
return put_user(retval, &upv->n_ports);
}
static int get_listen_mask(const struct file *f)
{
return (long)f->private_data;
}
static void set_listen_mask(struct file *f, int listen_mask)
{
f->private_data = (void*)(long)listen_mask;
}
static long openvswitch_ioctl(struct file *f, unsigned int cmd,
unsigned long argp)
{
int dp_idx = iminor(f->f_dentry->d_inode);
struct datapath *dp;
int drop_frags, listeners, port_no;
unsigned int sflow_probability;
int err;
/* Handle commands with special locking requirements up front. */
switch (cmd) {
case ODP_DP_CREATE:
err = create_dp(dp_idx, (char __user *)argp);
goto exit;
case ODP_DP_DESTROY:
err = destroy_dp(dp_idx);
goto exit;
case ODP_VPORT_ATTACH:
err = attach_port(dp_idx, (struct odp_port __user *)argp);
goto exit;
case ODP_VPORT_DETACH:
err = get_user(port_no, (int __user *)argp);
if (!err)
err = detach_port(dp_idx, port_no);
goto exit;
case ODP_VPORT_MOD:
err = vport_user_mod((struct odp_port __user *)argp);
goto exit;
case ODP_VPORT_STATS_GET:
err = vport_user_stats_get((struct odp_vport_stats_req __user *)argp);
goto exit;
case ODP_VPORT_STATS_SET:
err = vport_user_stats_set((struct odp_vport_stats_req __user *)argp);
goto exit;
case ODP_VPORT_ETHER_GET:
err = vport_user_ether_get((struct odp_vport_ether __user *)argp);
goto exit;
case ODP_VPORT_ETHER_SET:
err = vport_user_ether_set((struct odp_vport_ether __user *)argp);
goto exit;
case ODP_VPORT_MTU_GET:
err = vport_user_mtu_get((struct odp_vport_mtu __user *)argp);
goto exit;
case ODP_VPORT_MTU_SET:
err = vport_user_mtu_set((struct odp_vport_mtu __user *)argp);
goto exit;
}
dp = get_dp_locked(dp_idx);
err = -ENODEV;
if (!dp)
goto exit;
switch (cmd) {
case ODP_DP_STATS:
err = get_dp_stats(dp, (struct odp_stats __user *)argp);
break;
case ODP_GET_DROP_FRAGS:
err = put_user(dp->drop_frags, (int __user *)argp);
break;
case ODP_SET_DROP_FRAGS:
err = get_user(drop_frags, (int __user *)argp);
if (err)
break;
err = -EINVAL;
if (drop_frags != 0 && drop_frags != 1)
break;
dp->drop_frags = drop_frags;
err = 0;
break;
case ODP_GET_LISTEN_MASK:
err = put_user(get_listen_mask(f), (int __user *)argp);
break;
case ODP_SET_LISTEN_MASK:
err = get_user(listeners, (int __user *)argp);
if (err)
break;
err = -EINVAL;
if (listeners & ~ODPL_ALL)
break;
err = 0;
set_listen_mask(f, listeners);
break;
case ODP_GET_SFLOW_PROBABILITY:
err = put_user(dp->sflow_probability, (unsigned int __user *)argp);
break;
case ODP_SET_SFLOW_PROBABILITY:
err = get_user(sflow_probability, (unsigned int __user *)argp);
if (!err)
dp->sflow_probability = sflow_probability;
break;
case ODP_VPORT_QUERY:
err = query_port(dp, (struct odp_port __user *)argp);
break;
case ODP_VPORT_LIST:
err = list_ports(dp, (struct odp_portvec __user *)argp);
break;
case ODP_FLOW_FLUSH:
err = flush_flows(dp);
break;
case ODP_FLOW_PUT:
err = put_flow(dp, (struct odp_flow_put __user *)argp);
break;
case ODP_FLOW_DEL:
err = del_flow(dp, (struct odp_flow __user *)argp);
break;
case ODP_FLOW_GET:
err = do_flowvec_ioctl(dp, argp, do_query_flows);
break;
case ODP_FLOW_LIST:
err = do_flowvec_ioctl(dp, argp, do_list_flows);
break;
case ODP_EXECUTE:
err = execute_packet(dp, (struct odp_execute __user *)argp);
break;
default:
err = -ENOIOCTLCMD;
break;
}
mutex_unlock(&dp->mutex);
exit:
return err;
}
static int dp_has_packet_of_interest(struct datapath *dp, int listeners)
{
int i;
for (i = 0; i < DP_N_QUEUES; i++) {
if (listeners & (1 << i) && !skb_queue_empty(&dp->queues[i]))
return 1;
}
return 0;
}
#ifdef CONFIG_COMPAT
static int compat_list_ports(struct datapath *dp, struct compat_odp_portvec __user *upv)
{
struct compat_odp_portvec pv;
int retval;
if (copy_from_user(&pv, upv, sizeof pv))
return -EFAULT;
retval = do_list_ports(dp, compat_ptr(pv.ports), pv.n_ports);
if (retval < 0)
return retval;
return put_user(retval, &upv->n_ports);
}
static int compat_get_flow(struct odp_flow *flow, const struct compat_odp_flow __user *compat)
{
compat_uptr_t actions;
if (!access_ok(VERIFY_READ, compat, sizeof(struct compat_odp_flow)) ||
__copy_from_user(&flow->stats, &compat->stats, sizeof(struct odp_flow_stats)) ||
__copy_from_user(&flow->key, &compat->key, sizeof(struct odp_flow_key)) ||
__get_user(actions, &compat->actions) ||
__get_user(flow->n_actions, &compat->n_actions) ||
__get_user(flow->flags, &compat->flags))
return -EFAULT;
flow->actions = compat_ptr(actions);
return 0;
}
static int compat_put_flow(struct datapath *dp, struct compat_odp_flow_put __user *ufp)
{
struct odp_flow_stats stats;
struct odp_flow_put fp;
int error;
if (compat_get_flow(&fp.flow, &ufp->flow) ||
get_user(fp.flags, &ufp->flags))
return -EFAULT;
error = do_put_flow(dp, &fp, &stats);
if (error)
return error;
if (copy_to_user(&ufp->flow.stats, &stats,
sizeof(struct odp_flow_stats)))
return -EFAULT;
return 0;
}
static int compat_answer_query(struct sw_flow *flow, u32 query_flags,
struct compat_odp_flow __user *ufp)
{
compat_uptr_t actions;
if (get_user(actions, &ufp->actions))
return -EFAULT;
return do_answer_query(flow, query_flags, &ufp->stats,
compat_ptr(actions), &ufp->n_actions);
}
static int compat_del_flow(struct datapath *dp, struct compat_odp_flow __user *ufp)
{
struct sw_flow *flow;
struct odp_flow uf;
int error;
if (compat_get_flow(&uf, ufp))
return -EFAULT;
flow = do_del_flow(dp, &uf.key);
if (IS_ERR(flow))
return PTR_ERR(flow);
error = compat_answer_query(flow, 0, ufp);
flow_deferred_free(flow);
return error;
}
static int compat_query_flows(struct datapath *dp, struct compat_odp_flow *flows, u32 n_flows)
{
struct tbl *table = rcu_dereference(dp->table);
u32 i;
for (i = 0; i < n_flows; i++) {
struct compat_odp_flow __user *ufp = &flows[i];
struct odp_flow uf;
struct tbl_node *flow_node;
int error;
if (compat_get_flow(&uf, ufp))
return -EFAULT;
flow_node = tbl_lookup(table, &uf.key, flow_hash(&uf.key), flow_cmp);
if (!flow_node)
error = put_user(ENOENT, &ufp->stats.error);
else
error = compat_answer_query(flow_cast(flow_node), uf.flags, ufp);
if (error)
return -EFAULT;
}
return n_flows;
}
struct compat_list_flows_cbdata {
struct compat_odp_flow __user *uflows;
u32 n_flows;
u32 listed_flows;
};
static int compat_list_flow(struct tbl_node *node, void *cbdata_)
{
struct sw_flow *flow = flow_cast(node);
struct compat_list_flows_cbdata *cbdata = cbdata_;
struct compat_odp_flow __user *ufp = &cbdata->uflows[cbdata->listed_flows++];
int error;
if (copy_to_user(&ufp->key, &flow->key, sizeof flow->key))
return -EFAULT;
error = compat_answer_query(flow, 0, ufp);
if (error)
return error;
if (cbdata->listed_flows >= cbdata->n_flows)
return cbdata->listed_flows;
return 0;
}
static int compat_list_flows(struct datapath *dp, struct compat_odp_flow *flows, u32 n_flows)
{
struct compat_list_flows_cbdata cbdata;
int error;
if (!n_flows)
return 0;
cbdata.uflows = flows;
cbdata.n_flows = n_flows;
cbdata.listed_flows = 0;
error = tbl_foreach(rcu_dereference(dp->table), compat_list_flow, &cbdata);
return error ? error : cbdata.listed_flows;
}
static int compat_flowvec_ioctl(struct datapath *dp, unsigned long argp,
int (*function)(struct datapath *,
struct compat_odp_flow *,
u32 n_flows))
{
struct compat_odp_flowvec __user *uflowvec;
struct compat_odp_flow __user *flows;
struct compat_odp_flowvec flowvec;
int retval;
uflowvec = compat_ptr(argp);
if (!access_ok(VERIFY_WRITE, uflowvec, sizeof *uflowvec) ||
copy_from_user(&flowvec, uflowvec, sizeof flowvec))
return -EFAULT;
if (flowvec.n_flows > INT_MAX / sizeof(struct compat_odp_flow))
return -EINVAL;
flows = compat_ptr(flowvec.flows);
if (!access_ok(VERIFY_WRITE, flows,
flowvec.n_flows * sizeof(struct compat_odp_flow)))
return -EFAULT;
retval = function(dp, flows, flowvec.n_flows);
return (retval < 0 ? retval
: retval == flowvec.n_flows ? 0
: put_user(retval, &uflowvec->n_flows));
}
static int compat_execute(struct datapath *dp, const struct compat_odp_execute __user *uexecute)
{
struct odp_execute execute;
compat_uptr_t actions;
compat_uptr_t data;
if (!access_ok(VERIFY_READ, uexecute, sizeof(struct compat_odp_execute)) ||
__get_user(actions, &uexecute->actions) ||
__get_user(execute.n_actions, &uexecute->n_actions) ||
__get_user(data, &uexecute->data) ||
__get_user(execute.length, &uexecute->length))
return -EFAULT;
execute.actions = compat_ptr(actions);
execute.data = compat_ptr(data);
return do_execute(dp, &execute);
}
static long openvswitch_compat_ioctl(struct file *f, unsigned int cmd, unsigned long argp)
{
int dp_idx = iminor(f->f_dentry->d_inode);
struct datapath *dp;
int err;
switch (cmd) {
case ODP_DP_DESTROY:
case ODP_FLOW_FLUSH:
/* Ioctls that don't need any translation at all. */
return openvswitch_ioctl(f, cmd, argp);
case ODP_DP_CREATE:
case ODP_VPORT_ATTACH:
case ODP_VPORT_DETACH:
case ODP_VPORT_MOD:
case ODP_VPORT_MTU_SET:
case ODP_VPORT_MTU_GET:
case ODP_VPORT_ETHER_SET:
case ODP_VPORT_ETHER_GET:
case ODP_VPORT_STATS_SET:
case ODP_VPORT_STATS_GET:
case ODP_DP_STATS:
case ODP_GET_DROP_FRAGS:
case ODP_SET_DROP_FRAGS:
case ODP_SET_LISTEN_MASK:
case ODP_GET_LISTEN_MASK:
case ODP_SET_SFLOW_PROBABILITY:
case ODP_GET_SFLOW_PROBABILITY:
case ODP_VPORT_QUERY:
/* Ioctls that just need their pointer argument extended. */
return openvswitch_ioctl(f, cmd, (unsigned long)compat_ptr(argp));
}
dp = get_dp_locked(dp_idx);
err = -ENODEV;
if (!dp)
goto exit;
switch (cmd) {
case ODP_VPORT_LIST32:
err = compat_list_ports(dp, compat_ptr(argp));
break;
case ODP_FLOW_PUT32:
err = compat_put_flow(dp, compat_ptr(argp));
break;
case ODP_FLOW_DEL32:
err = compat_del_flow(dp, compat_ptr(argp));
break;
case ODP_FLOW_GET32:
err = compat_flowvec_ioctl(dp, argp, compat_query_flows);
break;
case ODP_FLOW_LIST32:
err = compat_flowvec_ioctl(dp, argp, compat_list_flows);
break;
case ODP_EXECUTE32:
err = compat_execute(dp, compat_ptr(argp));
break;
default:
err = -ENOIOCTLCMD;
break;
}
mutex_unlock(&dp->mutex);
exit:
return err;
}
#endif
/* Unfortunately this function is not exported so this is a verbatim copy
* from net/core/datagram.c in 2.6.30. */
static int skb_copy_and_csum_datagram(const struct sk_buff *skb, int offset,
u8 __user *to, int len,
__wsum *csump)
{
int start = skb_headlen(skb);
int pos = 0;
int i, copy = start - offset;
/* Copy header. */
if (copy > 0) {
int err = 0;
if (copy > len)
copy = len;
*csump = csum_and_copy_to_user(skb->data + offset, to, copy,
*csump, &err);
if (err)
goto fault;
if ((len -= copy) == 0)
return 0;
offset += copy;
to += copy;
pos = copy;
}
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
int end;
WARN_ON(start > offset + len);
end = start + skb_shinfo(skb)->frags[i].size;
if ((copy = end - offset) > 0) {
__wsum csum2;
int err = 0;
u8 *vaddr;
skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
struct page *page = frag->page;
if (copy > len)
copy = len;
vaddr = kmap(page);
csum2 = csum_and_copy_to_user(vaddr +
frag->page_offset +
offset - start,
to, copy, 0, &err);
kunmap(page);
if (err)
goto fault;
*csump = csum_block_add(*csump, csum2, pos);
if (!(len -= copy))
return 0;
offset += copy;
to += copy;
pos += copy;
}
start = end;
}
if (skb_shinfo(skb)->frag_list) {
struct sk_buff *list = skb_shinfo(skb)->frag_list;
for (; list; list=list->next) {
int end;
WARN_ON(start > offset + len);
end = start + list->len;
if ((copy = end - offset) > 0) {
__wsum csum2 = 0;
if (copy > len)
copy = len;
if (skb_copy_and_csum_datagram(list,
offset - start,
to, copy,
&csum2))
goto fault;
*csump = csum_block_add(*csump, csum2, pos);
if ((len -= copy) == 0)
return 0;
offset += copy;
to += copy;
pos += copy;
}
start = end;
}
}
if (!len)
return 0;
fault:
return -EFAULT;
}
static ssize_t openvswitch_read(struct file *f, char __user *buf,
size_t nbytes, loff_t *ppos)
{
/* XXX is there sufficient synchronization here? */
int listeners = get_listen_mask(f);
int dp_idx = iminor(f->f_dentry->d_inode);
struct datapath *dp = get_dp(dp_idx);
struct sk_buff *skb;
size_t copy_bytes, tot_copy_bytes;
int retval;
if (!dp)
return -ENODEV;
if (nbytes == 0 || !listeners)
return 0;
for (;;) {
int i;
for (i = 0; i < DP_N_QUEUES; i++) {
if (listeners & (1 << i)) {
skb = skb_dequeue(&dp->queues[i]);
if (skb)
goto success;
}
}
if (f->f_flags & O_NONBLOCK) {
retval = -EAGAIN;
goto error;
}
wait_event_interruptible(dp->waitqueue,
dp_has_packet_of_interest(dp,
listeners));
if (signal_pending(current)) {
retval = -ERESTARTSYS;
goto error;
}
}
success:
copy_bytes = tot_copy_bytes = min_t(size_t, skb->len, nbytes);
retval = 0;
if (skb->ip_summed == CHECKSUM_PARTIAL) {
if (copy_bytes == skb->len) {
__wsum csum = 0;
u16 csum_start, csum_offset;
get_skb_csum_pointers(skb, &csum_start, &csum_offset);
BUG_ON(csum_start >= skb_headlen(skb));
retval = skb_copy_and_csum_datagram(skb, csum_start, buf + csum_start,
copy_bytes - csum_start, &csum);
if (!retval) {
__sum16 __user *csump;
copy_bytes = csum_start;
csump = (__sum16 __user *)(buf + csum_start + csum_offset);
BUG_ON((char *)csump + sizeof(__sum16) > buf + nbytes);
put_user(csum_fold(csum), csump);
}
} else
retval = skb_checksum_help(skb);
}
if (!retval) {
struct iovec __user iov;
iov.iov_base = buf;
iov.iov_len = copy_bytes;
retval = skb_copy_datagram_iovec(skb, 0, &iov, iov.iov_len);
}
if (!retval)
retval = tot_copy_bytes;
kfree_skb(skb);
error:
return retval;
}
static unsigned int openvswitch_poll(struct file *file, poll_table *wait)
{
/* XXX is there sufficient synchronization here? */
int dp_idx = iminor(file->f_dentry->d_inode);
struct datapath *dp = get_dp(dp_idx);
unsigned int mask;
if (dp) {
mask = 0;
poll_wait(file, &dp->waitqueue, wait);
if (dp_has_packet_of_interest(dp, get_listen_mask(file)))
mask |= POLLIN | POLLRDNORM;
} else {
mask = POLLIN | POLLRDNORM | POLLHUP;
}
return mask;
}
static struct file_operations openvswitch_fops = {
/* XXX .aio_read = openvswitch_aio_read, */
.read = openvswitch_read,
.poll = openvswitch_poll,
.unlocked_ioctl = openvswitch_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = openvswitch_compat_ioctl,
#endif
/* XXX .fasync = openvswitch_fasync, */
};
static int major;
static int __init dp_init(void)
{
struct sk_buff *dummy_skb;
int err;
BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > sizeof(dummy_skb->cb));
printk("Open vSwitch %s, built "__DATE__" "__TIME__"\n", VERSION BUILDNR);
err = flow_init();
if (err)
goto error;
err = vport_init();
if (err)
goto error_flow_exit;
err = register_netdevice_notifier(&dp_device_notifier);
if (err)
goto error_vport_exit;
major = register_chrdev(0, "openvswitch", &openvswitch_fops);
if (err < 0)
goto error_unreg_notifier;
return 0;
error_unreg_notifier:
unregister_netdevice_notifier(&dp_device_notifier);
error_vport_exit:
vport_exit();
error_flow_exit:
flow_exit();
error:
return err;
}
static void dp_cleanup(void)
{
rcu_barrier();
unregister_chrdev(major, "openvswitch");
unregister_netdevice_notifier(&dp_device_notifier);
vport_exit();
flow_exit();
}
module_init(dp_init);
module_exit(dp_cleanup);
MODULE_DESCRIPTION("Open vSwitch switching datapath");
MODULE_LICENSE("GPL");
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