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linux/net/openvswitch/datapath.c
Ben Pfaff a1b5d0dd28 openvswitch: Check gso_type for correct sk_buff in queue_gso_packets(). 
At the point where it was used, skb_shinfo(skb)->gso_type referred to a
post-GSO sk_buff.  Thus, it would always be 0.  We want to know the pre-GSO
gso_type, so we need to obtain it before segmenting.

Before this change, the kernel would pass inconsistent data to userspace:
packets for UDP fragments with nonzero offset would be passed along with
flow keys that indicate a zero offset (that is, the flow key for "later"
fragments claimed to be "first" fragments).  This inconsistency tended
to confuse Open vSwitch userspace, causing it to log messages about
"failed to flow_del" the flows with "later" fragments.

Signed-off-by: Ben Pfaff <blp@nicira.com>
Signed-off-by: Jesse Gross <jesse@nicira.com>
2012-07-20 14:47:54 -07:00

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/*
* Copyright (c) 2007-2012 Nicira, Inc.
*
* 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.
*
* 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
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/init.h>
#include <linux/module.h>
#include <linux/if_arp.h>
#include <linux/if_vlan.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/jhash.h>
#include <linux/delay.h>
#include <linux/time.h>
#include <linux/etherdevice.h>
#include <linux/genetlink.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/ethtool.h>
#include <linux/wait.h>
#include <asm/div64.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/openvswitch.h>
#include <linux/rculist.h>
#include <linux/dmi.h>
#include <linux/workqueue.h>
#include <net/genetlink.h>
#include "datapath.h"
#include "flow.h"
#include "vport-internal_dev.h"
/**
* DOC: Locking:
*
* Writes to device state (add/remove datapath, port, set operations on vports,
* etc.) are protected by RTNL.
*
* Writes to other state (flow table modifications, set miscellaneous datapath
* parameters, etc.) are protected by genl_mutex. The RTNL lock nests inside
* genl_mutex.
*
* Reads are protected by RCU.
*
* There are a few special cases (mostly stats) that have their own
* synchronization but they nest under all of above and don't interact with
* each other.
*/
/* Global list of datapaths to enable dumping them all out.
* Protected by genl_mutex.
*/
static LIST_HEAD(dps);
#define REHASH_FLOW_INTERVAL (10 * 60 * HZ)
static void rehash_flow_table(struct work_struct *work);
static DECLARE_DELAYED_WORK(rehash_flow_wq, rehash_flow_table);
static struct vport *new_vport(const struct vport_parms *);
static int queue_gso_packets(int dp_ifindex, struct sk_buff *,
const struct dp_upcall_info *);
static int queue_userspace_packet(int dp_ifindex, struct sk_buff *,
const struct dp_upcall_info *);
/* Must be called with rcu_read_lock, genl_mutex, or RTNL lock. */
static struct datapath *get_dp(int dp_ifindex)
{
struct datapath *dp = NULL;
struct net_device *dev;
rcu_read_lock();
dev = dev_get_by_index_rcu(&init_net, dp_ifindex);
if (dev) {
struct vport *vport = ovs_internal_dev_get_vport(dev);
if (vport)
dp = vport->dp;
}
rcu_read_unlock();
return dp;
}
/* Must be called with rcu_read_lock or RTNL lock. */
const char *ovs_dp_name(const struct datapath *dp)
{
struct vport *vport = rcu_dereference_rtnl(dp->ports[OVSP_LOCAL]);
return vport->ops->get_name(vport);
}
static int get_dpifindex(struct datapath *dp)
{
struct vport *local;
int ifindex;
rcu_read_lock();
local = rcu_dereference(dp->ports[OVSP_LOCAL]);
if (local)
ifindex = local->ops->get_ifindex(local);
else
ifindex = 0;
rcu_read_unlock();
return ifindex;
}
static void destroy_dp_rcu(struct rcu_head *rcu)
{
struct datapath *dp = container_of(rcu, struct datapath, rcu);
ovs_flow_tbl_destroy((__force struct flow_table *)dp->table);
free_percpu(dp->stats_percpu);
kfree(dp);
}
/* Called with RTNL lock and genl_lock. */
static struct vport *new_vport(const struct vport_parms *parms)
{
struct vport *vport;
vport = ovs_vport_add(parms);
if (!IS_ERR(vport)) {
struct datapath *dp = parms->dp;
rcu_assign_pointer(dp->ports[parms->port_no], vport);
list_add(&vport->node, &dp->port_list);
}
return vport;
}
/* Called with RTNL lock. */
void ovs_dp_detach_port(struct vport *p)
{
ASSERT_RTNL();
/* First drop references to device. */
list_del(&p->node);
rcu_assign_pointer(p->dp->ports[p->port_no], NULL);
/* Then destroy it. */
ovs_vport_del(p);
}
/* Must be called with rcu_read_lock. */
void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
{
struct datapath *dp = p->dp;
struct sw_flow *flow;
struct dp_stats_percpu *stats;
struct sw_flow_key key;
u64 *stats_counter;
int error;
int key_len;
stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
/* Extract flow from 'skb' into 'key'. */
error = ovs_flow_extract(skb, p->port_no, &key, &key_len);
if (unlikely(error)) {
kfree_skb(skb);
return;
}
/* Look up flow. */
flow = ovs_flow_tbl_lookup(rcu_dereference(dp->table), &key, key_len);
if (unlikely(!flow)) {
struct dp_upcall_info upcall;
upcall.cmd = OVS_PACKET_CMD_MISS;
upcall.key = &key;
upcall.userdata = NULL;
upcall.pid = p->upcall_pid;
ovs_dp_upcall(dp, skb, &upcall);
consume_skb(skb);
stats_counter = &stats->n_missed;
goto out;
}
OVS_CB(skb)->flow = flow;
stats_counter = &stats->n_hit;
ovs_flow_used(OVS_CB(skb)->flow, skb);
ovs_execute_actions(dp, skb);
out:
/* Update datapath statistics. */
u64_stats_update_begin(&stats->sync);
(*stats_counter)++;
u64_stats_update_end(&stats->sync);
}
static struct genl_family dp_packet_genl_family = {
.id = GENL_ID_GENERATE,
.hdrsize = sizeof(struct ovs_header),
.name = OVS_PACKET_FAMILY,
.version = OVS_PACKET_VERSION,
.maxattr = OVS_PACKET_ATTR_MAX
};
int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
const struct dp_upcall_info *upcall_info)
{
struct dp_stats_percpu *stats;
int dp_ifindex;
int err;
if (upcall_info->pid == 0) {
err = -ENOTCONN;
goto err;
}
dp_ifindex = get_dpifindex(dp);
if (!dp_ifindex) {
err = -ENODEV;
goto err;
}
if (!skb_is_gso(skb))
err = queue_userspace_packet(dp_ifindex, skb, upcall_info);
else
err = queue_gso_packets(dp_ifindex, skb, upcall_info);
if (err)
goto err;
return 0;
err:
stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
u64_stats_update_begin(&stats->sync);
stats->n_lost++;
u64_stats_update_end(&stats->sync);
return err;
}
static int queue_gso_packets(int dp_ifindex, struct sk_buff *skb,
const struct dp_upcall_info *upcall_info)
{
unsigned short gso_type = skb_shinfo(skb)->gso_type;
struct dp_upcall_info later_info;
struct sw_flow_key later_key;
struct sk_buff *segs, *nskb;
int err;
segs = skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM);
if (IS_ERR(segs))
return PTR_ERR(segs);
/* Queue all of the segments. */
skb = segs;
do {
err = queue_userspace_packet(dp_ifindex, skb, upcall_info);
if (err)
break;
if (skb == segs && gso_type & SKB_GSO_UDP) {
/* The initial flow key extracted by ovs_flow_extract()
* in this case is for a first fragment, so we need to
* properly mark later fragments.
*/
later_key = *upcall_info->key;
later_key.ip.frag = OVS_FRAG_TYPE_LATER;
later_info = *upcall_info;
later_info.key = &later_key;
upcall_info = &later_info;
}
} while ((skb = skb->next));
/* Free all of the segments. */
skb = segs;
do {
nskb = skb->next;
if (err)
kfree_skb(skb);
else
consume_skb(skb);
} while ((skb = nskb));
return err;
}
static int queue_userspace_packet(int dp_ifindex, struct sk_buff *skb,
const struct dp_upcall_info *upcall_info)
{
struct ovs_header *upcall;
struct sk_buff *nskb = NULL;
struct sk_buff *user_skb; /* to be queued to userspace */
struct nlattr *nla;
unsigned int len;
int err;
if (vlan_tx_tag_present(skb)) {
nskb = skb_clone(skb, GFP_ATOMIC);
if (!nskb)
return -ENOMEM;
nskb = __vlan_put_tag(nskb, vlan_tx_tag_get(nskb));
if (!skb)
return -ENOMEM;
nskb->vlan_tci = 0;
skb = nskb;
}
if (nla_attr_size(skb->len) > USHRT_MAX) {
err = -EFBIG;
goto out;
}
len = sizeof(struct ovs_header);
len += nla_total_size(skb->len);
len += nla_total_size(FLOW_BUFSIZE);
if (upcall_info->cmd == OVS_PACKET_CMD_ACTION)
len += nla_total_size(8);
user_skb = genlmsg_new(len, GFP_ATOMIC);
if (!user_skb) {
err = -ENOMEM;
goto out;
}
upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
0, upcall_info->cmd);
upcall->dp_ifindex = dp_ifindex;
nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
ovs_flow_to_nlattrs(upcall_info->key, user_skb);
nla_nest_end(user_skb, nla);
if (upcall_info->userdata)
nla_put_u64(user_skb, OVS_PACKET_ATTR_USERDATA,
nla_get_u64(upcall_info->userdata));
nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len);
skb_copy_and_csum_dev(skb, nla_data(nla));
err = genlmsg_unicast(&init_net, user_skb, upcall_info->pid);
out:
kfree_skb(nskb);
return err;
}
/* Called with genl_mutex. */
static int flush_flows(int dp_ifindex)
{
struct flow_table *old_table;
struct flow_table *new_table;
struct datapath *dp;
dp = get_dp(dp_ifindex);
if (!dp)
return -ENODEV;
old_table = genl_dereference(dp->table);
new_table = ovs_flow_tbl_alloc(TBL_MIN_BUCKETS);
if (!new_table)
return -ENOMEM;
rcu_assign_pointer(dp->table, new_table);
ovs_flow_tbl_deferred_destroy(old_table);
return 0;
}
static int validate_actions(const struct nlattr *attr,
const struct sw_flow_key *key, int depth);
static int validate_sample(const struct nlattr *attr,
const struct sw_flow_key *key, int depth)
{
const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1];
const struct nlattr *probability, *actions;
const struct nlattr *a;
int rem;
memset(attrs, 0, sizeof(attrs));
nla_for_each_nested(a, attr, rem) {
int type = nla_type(a);
if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type])
return -EINVAL;
attrs[type] = a;
}
if (rem)
return -EINVAL;
probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY];
if (!probability || nla_len(probability) != sizeof(u32))
return -EINVAL;
actions = attrs[OVS_SAMPLE_ATTR_ACTIONS];
if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN))
return -EINVAL;
return validate_actions(actions, key, depth + 1);
}
static int validate_set(const struct nlattr *a,
const struct sw_flow_key *flow_key)
{
const struct nlattr *ovs_key = nla_data(a);
int key_type = nla_type(ovs_key);
/* There can be only one key in a action */
if (nla_total_size(nla_len(ovs_key)) != nla_len(a))
return -EINVAL;
if (key_type > OVS_KEY_ATTR_MAX ||
nla_len(ovs_key) != ovs_key_lens[key_type])
return -EINVAL;
switch (key_type) {
const struct ovs_key_ipv4 *ipv4_key;
case OVS_KEY_ATTR_PRIORITY:
case OVS_KEY_ATTR_ETHERNET:
break;
case OVS_KEY_ATTR_IPV4:
if (flow_key->eth.type != htons(ETH_P_IP))
return -EINVAL;
if (!flow_key->ipv4.addr.src || !flow_key->ipv4.addr.dst)
return -EINVAL;
ipv4_key = nla_data(ovs_key);
if (ipv4_key->ipv4_proto != flow_key->ip.proto)
return -EINVAL;
if (ipv4_key->ipv4_frag != flow_key->ip.frag)
return -EINVAL;
break;
case OVS_KEY_ATTR_TCP:
if (flow_key->ip.proto != IPPROTO_TCP)
return -EINVAL;
if (!flow_key->ipv4.tp.src || !flow_key->ipv4.tp.dst)
return -EINVAL;
break;
case OVS_KEY_ATTR_UDP:
if (flow_key->ip.proto != IPPROTO_UDP)
return -EINVAL;
if (!flow_key->ipv4.tp.src || !flow_key->ipv4.tp.dst)
return -EINVAL;
break;
default:
return -EINVAL;
}
return 0;
}
static int validate_userspace(const struct nlattr *attr)
{
static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = {
[OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 },
[OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_U64 },
};
struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];
int error;
error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX,
attr, userspace_policy);
if (error)
return error;
if (!a[OVS_USERSPACE_ATTR_PID] ||
!nla_get_u32(a[OVS_USERSPACE_ATTR_PID]))
return -EINVAL;
return 0;
}
static int validate_actions(const struct nlattr *attr,
const struct sw_flow_key *key, int depth)
{
const struct nlattr *a;
int rem, err;
if (depth >= SAMPLE_ACTION_DEPTH)
return -EOVERFLOW;
nla_for_each_nested(a, attr, rem) {
/* Expected argument lengths, (u32)-1 for variable length. */
static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
[OVS_ACTION_ATTR_OUTPUT] = sizeof(u32),
[OVS_ACTION_ATTR_USERSPACE] = (u32)-1,
[OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan),
[OVS_ACTION_ATTR_POP_VLAN] = 0,
[OVS_ACTION_ATTR_SET] = (u32)-1,
[OVS_ACTION_ATTR_SAMPLE] = (u32)-1
};
const struct ovs_action_push_vlan *vlan;
int type = nla_type(a);
if (type > OVS_ACTION_ATTR_MAX ||
(action_lens[type] != nla_len(a) &&
action_lens[type] != (u32)-1))
return -EINVAL;
switch (type) {
case OVS_ACTION_ATTR_UNSPEC:
return -EINVAL;
case OVS_ACTION_ATTR_USERSPACE:
err = validate_userspace(a);
if (err)
return err;
break;
case OVS_ACTION_ATTR_OUTPUT:
if (nla_get_u32(a) >= DP_MAX_PORTS)
return -EINVAL;
break;
case OVS_ACTION_ATTR_POP_VLAN:
break;
case OVS_ACTION_ATTR_PUSH_VLAN:
vlan = nla_data(a);
if (vlan->vlan_tpid != htons(ETH_P_8021Q))
return -EINVAL;
if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT)))
return -EINVAL;
break;
case OVS_ACTION_ATTR_SET:
err = validate_set(a, key);
if (err)
return err;
break;
case OVS_ACTION_ATTR_SAMPLE:
err = validate_sample(a, key, depth);
if (err)
return err;
break;
default:
return -EINVAL;
}
}
if (rem > 0)
return -EINVAL;
return 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 ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
{
struct ovs_header *ovs_header = info->userhdr;
struct nlattr **a = info->attrs;
struct sw_flow_actions *acts;
struct sk_buff *packet;
struct sw_flow *flow;
struct datapath *dp;
struct ethhdr *eth;
int len;
int err;
int key_len;
err = -EINVAL;
if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
!a[OVS_PACKET_ATTR_ACTIONS] ||
nla_len(a[OVS_PACKET_ATTR_PACKET]) < ETH_HLEN)
goto err;
len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
err = -ENOMEM;
if (!packet)
goto err;
skb_reserve(packet, NET_IP_ALIGN);
memcpy(__skb_put(packet, len), nla_data(a[OVS_PACKET_ATTR_PACKET]), len);
skb_reset_mac_header(packet);
eth = eth_hdr(packet);
/* 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)
packet->protocol = eth->h_proto;
else
packet->protocol = htons(ETH_P_802_2);
/* Build an sw_flow for sending this packet. */
flow = ovs_flow_alloc();
err = PTR_ERR(flow);
if (IS_ERR(flow))
goto err_kfree_skb;
err = ovs_flow_extract(packet, -1, &flow->key, &key_len);
if (err)
goto err_flow_free;
err = ovs_flow_metadata_from_nlattrs(&flow->key.phy.priority,
&flow->key.phy.in_port,
a[OVS_PACKET_ATTR_KEY]);
if (err)
goto err_flow_free;
err = validate_actions(a[OVS_PACKET_ATTR_ACTIONS], &flow->key, 0);
if (err)
goto err_flow_free;
flow->hash = ovs_flow_hash(&flow->key, key_len);
acts = ovs_flow_actions_alloc(a[OVS_PACKET_ATTR_ACTIONS]);
err = PTR_ERR(acts);
if (IS_ERR(acts))
goto err_flow_free;
rcu_assign_pointer(flow->sf_acts, acts);
OVS_CB(packet)->flow = flow;
packet->priority = flow->key.phy.priority;
rcu_read_lock();
dp = get_dp(ovs_header->dp_ifindex);
err = -ENODEV;
if (!dp)
goto err_unlock;
local_bh_disable();
err = ovs_execute_actions(dp, packet);
local_bh_enable();
rcu_read_unlock();
ovs_flow_free(flow);
return err;
err_unlock:
rcu_read_unlock();
err_flow_free:
ovs_flow_free(flow);
err_kfree_skb:
kfree_skb(packet);
err:
return err;
}
static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
[OVS_PACKET_ATTR_PACKET] = { .type = NLA_UNSPEC },
[OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
[OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
};
static struct genl_ops dp_packet_genl_ops[] = {
{ .cmd = OVS_PACKET_CMD_EXECUTE,
.flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
.policy = packet_policy,
.doit = ovs_packet_cmd_execute
}
};
static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats)
{
int i;
struct flow_table *table = genl_dereference(dp->table);
stats->n_flows = ovs_flow_tbl_count(table);
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 int start;
percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
do {
start = u64_stats_fetch_begin_bh(&percpu_stats->sync);
local_stats = *percpu_stats;
} while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start));
stats->n_hit += local_stats.n_hit;
stats->n_missed += local_stats.n_missed;
stats->n_lost += local_stats.n_lost;
}
}
static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
[OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
[OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
[OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
};
static struct genl_family dp_flow_genl_family = {
.id = GENL_ID_GENERATE,
.hdrsize = sizeof(struct ovs_header),
.name = OVS_FLOW_FAMILY,
.version = OVS_FLOW_VERSION,
.maxattr = OVS_FLOW_ATTR_MAX
};
static struct genl_multicast_group ovs_dp_flow_multicast_group = {
.name = OVS_FLOW_MCGROUP
};
/* Called with genl_lock. */
static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
struct sk_buff *skb, u32 pid,
u32 seq, u32 flags, u8 cmd)
{
const int skb_orig_len = skb->len;
const struct sw_flow_actions *sf_acts;
struct ovs_flow_stats stats;
struct ovs_header *ovs_header;
struct nlattr *nla;
unsigned long used;
u8 tcp_flags;
int err;
sf_acts = rcu_dereference_protected(flow->sf_acts,
lockdep_genl_is_held());
ovs_header = genlmsg_put(skb, pid, seq, &dp_flow_genl_family, flags, cmd);
if (!ovs_header)
return -EMSGSIZE;
ovs_header->dp_ifindex = get_dpifindex(dp);
nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
if (!nla)
goto nla_put_failure;
err = ovs_flow_to_nlattrs(&flow->key, skb);
if (err)
goto error;
nla_nest_end(skb, nla);
spin_lock_bh(&flow->lock);
used = flow->used;
stats.n_packets = flow->packet_count;
stats.n_bytes = flow->byte_count;
tcp_flags = flow->tcp_flags;
spin_unlock_bh(&flow->lock);
if (used)
NLA_PUT_U64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used));
if (stats.n_packets)
NLA_PUT(skb, OVS_FLOW_ATTR_STATS,
sizeof(struct ovs_flow_stats), &stats);
if (tcp_flags)
NLA_PUT_U8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags);
/* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
* this is the first flow to be dumped into 'skb'. This is unusual for
* Netlink but individual action lists can be longer than
* NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
* The userspace caller can always fetch the actions separately if it
* really wants them. (Most userspace callers in fact don't care.)
*
* This can only fail for dump operations because the skb is always
* properly sized for single flows.
*/
err = nla_put(skb, OVS_FLOW_ATTR_ACTIONS, sf_acts->actions_len,
sf_acts->actions);
if (err < 0 && skb_orig_len)
goto error;
return genlmsg_end(skb, ovs_header);
nla_put_failure:
err = -EMSGSIZE;
error:
genlmsg_cancel(skb, ovs_header);
return err;
}
static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow)
{
const struct sw_flow_actions *sf_acts;
int len;
sf_acts = rcu_dereference_protected(flow->sf_acts,
lockdep_genl_is_held());
/* OVS_FLOW_ATTR_KEY */
len = nla_total_size(FLOW_BUFSIZE);
/* OVS_FLOW_ATTR_ACTIONS */
len += nla_total_size(sf_acts->actions_len);
/* OVS_FLOW_ATTR_STATS */
len += nla_total_size(sizeof(struct ovs_flow_stats));
/* OVS_FLOW_ATTR_TCP_FLAGS */
len += nla_total_size(1);
/* OVS_FLOW_ATTR_USED */
len += nla_total_size(8);
len += NLMSG_ALIGN(sizeof(struct ovs_header));
return genlmsg_new(len, GFP_KERNEL);
}
static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow,
struct datapath *dp,
u32 pid, u32 seq, u8 cmd)
{
struct sk_buff *skb;
int retval;
skb = ovs_flow_cmd_alloc_info(flow);
if (!skb)
return ERR_PTR(-ENOMEM);
retval = ovs_flow_cmd_fill_info(flow, dp, skb, pid, seq, 0, cmd);
BUG_ON(retval < 0);
return skb;
}
static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr **a = info->attrs;
struct ovs_header *ovs_header = info->userhdr;
struct sw_flow_key key;
struct sw_flow *flow;
struct sk_buff *reply;
struct datapath *dp;
struct flow_table *table;
int error;
int key_len;
/* Extract key. */
error = -EINVAL;
if (!a[OVS_FLOW_ATTR_KEY])
goto error;
error = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
if (error)
goto error;
/* Validate actions. */
if (a[OVS_FLOW_ATTR_ACTIONS]) {
error = validate_actions(a[OVS_FLOW_ATTR_ACTIONS], &key, 0);
if (error)
goto error;
} else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) {
error = -EINVAL;
goto error;
}
dp = get_dp(ovs_header->dp_ifindex);
error = -ENODEV;
if (!dp)
goto error;
table = genl_dereference(dp->table);
flow = ovs_flow_tbl_lookup(table, &key, key_len);
if (!flow) {
struct sw_flow_actions *acts;
/* Bail out if we're not allowed to create a new flow. */
error = -ENOENT;
if (info->genlhdr->cmd == OVS_FLOW_CMD_SET)
goto error;
/* Expand table, if necessary, to make room. */
if (ovs_flow_tbl_need_to_expand(table)) {
struct flow_table *new_table;
new_table = ovs_flow_tbl_expand(table);
if (!IS_ERR(new_table)) {
rcu_assign_pointer(dp->table, new_table);
ovs_flow_tbl_deferred_destroy(table);
table = genl_dereference(dp->table);
}
}
/* Allocate flow. */
flow = ovs_flow_alloc();
if (IS_ERR(flow)) {
error = PTR_ERR(flow);
goto error;
}
flow->key = key;
clear_stats(flow);
/* Obtain actions. */
acts = ovs_flow_actions_alloc(a[OVS_FLOW_ATTR_ACTIONS]);
error = PTR_ERR(acts);
if (IS_ERR(acts))
goto error_free_flow;
rcu_assign_pointer(flow->sf_acts, acts);
/* Put flow in bucket. */
flow->hash = ovs_flow_hash(&key, key_len);
ovs_flow_tbl_insert(table, flow);
reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid,
info->snd_seq,
OVS_FLOW_CMD_NEW);
} else {
/* We found a matching flow. */
struct sw_flow_actions *old_acts;
struct nlattr *acts_attrs;
/* Bail out if we're not allowed to modify an existing flow.
* We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
* because Generic Netlink treats the latter as a dump
* request. We also accept NLM_F_EXCL in case that bug ever
* gets fixed.
*/
error = -EEXIST;
if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW &&
info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
goto error;
/* Update actions. */
old_acts = rcu_dereference_protected(flow->sf_acts,
lockdep_genl_is_held());
acts_attrs = a[OVS_FLOW_ATTR_ACTIONS];
if (acts_attrs &&
(old_acts->actions_len != nla_len(acts_attrs) ||
memcmp(old_acts->actions, nla_data(acts_attrs),
old_acts->actions_len))) {
struct sw_flow_actions *new_acts;
new_acts = ovs_flow_actions_alloc(acts_attrs);
error = PTR_ERR(new_acts);
if (IS_ERR(new_acts))
goto error;
rcu_assign_pointer(flow->sf_acts, new_acts);
ovs_flow_deferred_free_acts(old_acts);
}
reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid,
info->snd_seq, OVS_FLOW_CMD_NEW);
/* Clear stats. */
if (a[OVS_FLOW_ATTR_CLEAR]) {
spin_lock_bh(&flow->lock);
clear_stats(flow);
spin_unlock_bh(&flow->lock);
}
}
if (!IS_ERR(reply))
genl_notify(reply, genl_info_net(info), info->snd_pid,
ovs_dp_flow_multicast_group.id, info->nlhdr,
GFP_KERNEL);
else
netlink_set_err(init_net.genl_sock, 0,
ovs_dp_flow_multicast_group.id, PTR_ERR(reply));
return 0;
error_free_flow:
ovs_flow_free(flow);
error:
return error;
}
static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr **a = info->attrs;
struct ovs_header *ovs_header = info->userhdr;
struct sw_flow_key key;
struct sk_buff *reply;
struct sw_flow *flow;
struct datapath *dp;
struct flow_table *table;
int err;
int key_len;
if (!a[OVS_FLOW_ATTR_KEY])
return -EINVAL;
err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
if (err)
return err;
dp = get_dp(ovs_header->dp_ifindex);
if (!dp)
return -ENODEV;
table = genl_dereference(dp->table);
flow = ovs_flow_tbl_lookup(table, &key, key_len);
if (!flow)
return -ENOENT;
reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid,
info->snd_seq, OVS_FLOW_CMD_NEW);
if (IS_ERR(reply))
return PTR_ERR(reply);
return genlmsg_reply(reply, info);
}
static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr **a = info->attrs;
struct ovs_header *ovs_header = info->userhdr;
struct sw_flow_key key;
struct sk_buff *reply;
struct sw_flow *flow;
struct datapath *dp;
struct flow_table *table;
int err;
int key_len;
if (!a[OVS_FLOW_ATTR_KEY])
return flush_flows(ovs_header->dp_ifindex);
err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
if (err)
return err;
dp = get_dp(ovs_header->dp_ifindex);
if (!dp)
return -ENODEV;
table = genl_dereference(dp->table);
flow = ovs_flow_tbl_lookup(table, &key, key_len);
if (!flow)
return -ENOENT;
reply = ovs_flow_cmd_alloc_info(flow);
if (!reply)
return -ENOMEM;
ovs_flow_tbl_remove(table, flow);
err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_pid,
info->snd_seq, 0, OVS_FLOW_CMD_DEL);
BUG_ON(err < 0);
ovs_flow_deferred_free(flow);
genl_notify(reply, genl_info_net(info), info->snd_pid,
ovs_dp_flow_multicast_group.id, info->nlhdr, GFP_KERNEL);
return 0;
}
static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
struct datapath *dp;
struct flow_table *table;
dp = get_dp(ovs_header->dp_ifindex);
if (!dp)
return -ENODEV;
table = genl_dereference(dp->table);
for (;;) {
struct sw_flow *flow;
u32 bucket, obj;
bucket = cb->args[0];
obj = cb->args[1];
flow = ovs_flow_tbl_next(table, &bucket, &obj);
if (!flow)
break;
if (ovs_flow_cmd_fill_info(flow, dp, skb,
NETLINK_CB(cb->skb).pid,
cb->nlh->nlmsg_seq, NLM_F_MULTI,
OVS_FLOW_CMD_NEW) < 0)
break;
cb->args[0] = bucket;
cb->args[1] = obj;
}
return skb->len;
}
static struct genl_ops dp_flow_genl_ops[] = {
{ .cmd = OVS_FLOW_CMD_NEW,
.flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
.policy = flow_policy,
.doit = ovs_flow_cmd_new_or_set
},
{ .cmd = OVS_FLOW_CMD_DEL,
.flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
.policy = flow_policy,
.doit = ovs_flow_cmd_del
},
{ .cmd = OVS_FLOW_CMD_GET,
.flags = 0, /* OK for unprivileged users. */
.policy = flow_policy,
.doit = ovs_flow_cmd_get,
.dumpit = ovs_flow_cmd_dump
},
{ .cmd = OVS_FLOW_CMD_SET,
.flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
.policy = flow_policy,
.doit = ovs_flow_cmd_new_or_set,
},
};
static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
[OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
[OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
};
static struct genl_family dp_datapath_genl_family = {
.id = GENL_ID_GENERATE,
.hdrsize = sizeof(struct ovs_header),
.name = OVS_DATAPATH_FAMILY,
.version = OVS_DATAPATH_VERSION,
.maxattr = OVS_DP_ATTR_MAX
};
static struct genl_multicast_group ovs_dp_datapath_multicast_group = {
.name = OVS_DATAPATH_MCGROUP
};
static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
u32 pid, u32 seq, u32 flags, u8 cmd)
{
struct ovs_header *ovs_header;
struct ovs_dp_stats dp_stats;
int err;
ovs_header = genlmsg_put(skb, pid, seq, &dp_datapath_genl_family,
flags, cmd);
if (!ovs_header)
goto error;
ovs_header->dp_ifindex = get_dpifindex(dp);
rcu_read_lock();
err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
rcu_read_unlock();
if (err)
goto nla_put_failure;
get_dp_stats(dp, &dp_stats);
NLA_PUT(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats);
return genlmsg_end(skb, ovs_header);
nla_put_failure:
genlmsg_cancel(skb, ovs_header);
error:
return -EMSGSIZE;
}
static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 pid,
u32 seq, u8 cmd)
{
struct sk_buff *skb;
int retval;
skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!skb)
return ERR_PTR(-ENOMEM);
retval = ovs_dp_cmd_fill_info(dp, skb, pid, seq, 0, cmd);
if (retval < 0) {
kfree_skb(skb);
return ERR_PTR(retval);
}
return skb;
}
/* Called with genl_mutex and optionally with RTNL lock also. */
static struct datapath *lookup_datapath(struct ovs_header *ovs_header,
struct nlattr *a[OVS_DP_ATTR_MAX + 1])
{
struct datapath *dp;
if (!a[OVS_DP_ATTR_NAME])
dp = get_dp(ovs_header->dp_ifindex);
else {
struct vport *vport;
rcu_read_lock();
vport = ovs_vport_locate(nla_data(a[OVS_DP_ATTR_NAME]));
dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
rcu_read_unlock();
}
return dp ? dp : ERR_PTR(-ENODEV);
}
static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr **a = info->attrs;
struct vport_parms parms;
struct sk_buff *reply;
struct datapath *dp;
struct vport *vport;
int err;
err = -EINVAL;
if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
goto err;
rtnl_lock();
err = -ENODEV;
if (!try_module_get(THIS_MODULE))
goto err_unlock_rtnl;
err = -ENOMEM;
dp = kzalloc(sizeof(*dp), GFP_KERNEL);
if (dp == NULL)
goto err_put_module;
INIT_LIST_HEAD(&dp->port_list);
/* Allocate table. */
err = -ENOMEM;
rcu_assign_pointer(dp->table, ovs_flow_tbl_alloc(TBL_MIN_BUCKETS));
if (!dp->table)
goto err_free_dp;
dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
if (!dp->stats_percpu) {
err = -ENOMEM;
goto err_destroy_table;
}
/* Set up our datapath device. */
parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
parms.type = OVS_VPORT_TYPE_INTERNAL;
parms.options = NULL;
parms.dp = dp;
parms.port_no = OVSP_LOCAL;
parms.upcall_pid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]);
vport = new_vport(&parms);
if (IS_ERR(vport)) {
err = PTR_ERR(vport);
if (err == -EBUSY)
err = -EEXIST;
goto err_destroy_percpu;
}
reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
info->snd_seq, OVS_DP_CMD_NEW);
err = PTR_ERR(reply);
if (IS_ERR(reply))
goto err_destroy_local_port;
list_add_tail(&dp->list_node, &dps);
rtnl_unlock();
genl_notify(reply, genl_info_net(info), info->snd_pid,
ovs_dp_datapath_multicast_group.id, info->nlhdr,
GFP_KERNEL);
return 0;
err_destroy_local_port:
ovs_dp_detach_port(rtnl_dereference(dp->ports[OVSP_LOCAL]));
err_destroy_percpu:
free_percpu(dp->stats_percpu);
err_destroy_table:
ovs_flow_tbl_destroy(genl_dereference(dp->table));
err_free_dp:
kfree(dp);
err_put_module:
module_put(THIS_MODULE);
err_unlock_rtnl:
rtnl_unlock();
err:
return err;
}
static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
{
struct vport *vport, *next_vport;
struct sk_buff *reply;
struct datapath *dp;
int err;
rtnl_lock();
dp = lookup_datapath(info->userhdr, info->attrs);
err = PTR_ERR(dp);
if (IS_ERR(dp))
goto exit_unlock;
reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
info->snd_seq, OVS_DP_CMD_DEL);
err = PTR_ERR(reply);
if (IS_ERR(reply))
goto exit_unlock;
list_for_each_entry_safe(vport, next_vport, &dp->port_list, node)
if (vport->port_no != OVSP_LOCAL)
ovs_dp_detach_port(vport);
list_del(&dp->list_node);
ovs_dp_detach_port(rtnl_dereference(dp->ports[OVSP_LOCAL]));
/* rtnl_unlock() will wait until all the references to devices that
* are pending unregistration have been dropped. We do it here to
* ensure that any internal devices (which contain DP pointers) are
* fully destroyed before freeing the datapath.
*/
rtnl_unlock();
call_rcu(&dp->rcu, destroy_dp_rcu);
module_put(THIS_MODULE);
genl_notify(reply, genl_info_net(info), info->snd_pid,
ovs_dp_datapath_multicast_group.id, info->nlhdr,
GFP_KERNEL);
return 0;
exit_unlock:
rtnl_unlock();
return err;
}
static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
{
struct sk_buff *reply;
struct datapath *dp;
int err;
dp = lookup_datapath(info->userhdr, info->attrs);
if (IS_ERR(dp))
return PTR_ERR(dp);
reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
info->snd_seq, OVS_DP_CMD_NEW);
if (IS_ERR(reply)) {
err = PTR_ERR(reply);
netlink_set_err(init_net.genl_sock, 0,
ovs_dp_datapath_multicast_group.id, err);
return 0;
}
genl_notify(reply, genl_info_net(info), info->snd_pid,
ovs_dp_datapath_multicast_group.id, info->nlhdr,
GFP_KERNEL);
return 0;
}
static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
{
struct sk_buff *reply;
struct datapath *dp;
dp = lookup_datapath(info->userhdr, info->attrs);
if (IS_ERR(dp))
return PTR_ERR(dp);
reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
info->snd_seq, OVS_DP_CMD_NEW);
if (IS_ERR(reply))
return PTR_ERR(reply);
return genlmsg_reply(reply, info);
}
static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
struct datapath *dp;
int skip = cb->args[0];
int i = 0;
list_for_each_entry(dp, &dps, list_node) {
if (i >= skip &&
ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).pid,
cb->nlh->nlmsg_seq, NLM_F_MULTI,
OVS_DP_CMD_NEW) < 0)
break;
i++;
}
cb->args[0] = i;
return skb->len;
}
static struct genl_ops dp_datapath_genl_ops[] = {
{ .cmd = OVS_DP_CMD_NEW,
.flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
.policy = datapath_policy,
.doit = ovs_dp_cmd_new
},
{ .cmd = OVS_DP_CMD_DEL,
.flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
.policy = datapath_policy,
.doit = ovs_dp_cmd_del
},
{ .cmd = OVS_DP_CMD_GET,
.flags = 0, /* OK for unprivileged users. */
.policy = datapath_policy,
.doit = ovs_dp_cmd_get,
.dumpit = ovs_dp_cmd_dump
},
{ .cmd = OVS_DP_CMD_SET,
.flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
.policy = datapath_policy,
.doit = ovs_dp_cmd_set,
},
};
static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
[OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
[OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
[OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
[OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
[OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
[OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
};
static struct genl_family dp_vport_genl_family = {
.id = GENL_ID_GENERATE,
.hdrsize = sizeof(struct ovs_header),
.name = OVS_VPORT_FAMILY,
.version = OVS_VPORT_VERSION,
.maxattr = OVS_VPORT_ATTR_MAX
};
struct genl_multicast_group ovs_dp_vport_multicast_group = {
.name = OVS_VPORT_MCGROUP
};
/* Called with RTNL lock or RCU read lock. */
static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
u32 pid, u32 seq, u32 flags, u8 cmd)
{
struct ovs_header *ovs_header;
struct ovs_vport_stats vport_stats;
int err;
ovs_header = genlmsg_put(skb, pid, seq, &dp_vport_genl_family,
flags, cmd);
if (!ovs_header)
return -EMSGSIZE;
ovs_header->dp_ifindex = get_dpifindex(vport->dp);
NLA_PUT_U32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no);
NLA_PUT_U32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type);
NLA_PUT_STRING(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport));
NLA_PUT_U32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_pid);
ovs_vport_get_stats(vport, &vport_stats);
NLA_PUT(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats),
&vport_stats);
err = ovs_vport_get_options(vport, skb);
if (err == -EMSGSIZE)
goto error;
return genlmsg_end(skb, ovs_header);
nla_put_failure:
err = -EMSGSIZE;
error:
genlmsg_cancel(skb, ovs_header);
return err;
}
/* Called with RTNL lock or RCU read lock. */
struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 pid,
u32 seq, u8 cmd)
{
struct sk_buff *skb;
int retval;
skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
if (!skb)
return ERR_PTR(-ENOMEM);
retval = ovs_vport_cmd_fill_info(vport, skb, pid, seq, 0, cmd);
if (retval < 0) {
kfree_skb(skb);
return ERR_PTR(retval);
}
return skb;
}
/* Called with RTNL lock or RCU read lock. */
static struct vport *lookup_vport(struct ovs_header *ovs_header,
struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
{
struct datapath *dp;
struct vport *vport;
if (a[OVS_VPORT_ATTR_NAME]) {
vport = ovs_vport_locate(nla_data(a[OVS_VPORT_ATTR_NAME]));
if (!vport)
return ERR_PTR(-ENODEV);
if (ovs_header->dp_ifindex &&
ovs_header->dp_ifindex != get_dpifindex(vport->dp))
return ERR_PTR(-ENODEV);
return vport;
} else if (a[OVS_VPORT_ATTR_PORT_NO]) {
u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
if (port_no >= DP_MAX_PORTS)
return ERR_PTR(-EFBIG);
dp = get_dp(ovs_header->dp_ifindex);
if (!dp)
return ERR_PTR(-ENODEV);
vport = rcu_dereference_rtnl(dp->ports[port_no]);
if (!vport)
return ERR_PTR(-ENOENT);
return vport;
} else
return ERR_PTR(-EINVAL);
}
static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr **a = info->attrs;
struct ovs_header *ovs_header = info->userhdr;
struct vport_parms parms;
struct sk_buff *reply;
struct vport *vport;
struct datapath *dp;
u32 port_no;
int err;
err = -EINVAL;
if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
!a[OVS_VPORT_ATTR_UPCALL_PID])
goto exit;
rtnl_lock();
dp = get_dp(ovs_header->dp_ifindex);
err = -ENODEV;
if (!dp)
goto exit_unlock;
if (a[OVS_VPORT_ATTR_PORT_NO]) {
port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
err = -EFBIG;
if (port_no >= DP_MAX_PORTS)
goto exit_unlock;
vport = rtnl_dereference(dp->ports[port_no]);
err = -EBUSY;
if (vport)
goto exit_unlock;
} else {
for (port_no = 1; ; port_no++) {
if (port_no >= DP_MAX_PORTS) {
err = -EFBIG;
goto exit_unlock;
}
vport = rtnl_dereference(dp->ports[port_no]);
if (!vport)
break;
}
}
parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
parms.options = a[OVS_VPORT_ATTR_OPTIONS];
parms.dp = dp;
parms.port_no = port_no;
parms.upcall_pid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
vport = new_vport(&parms);
err = PTR_ERR(vport);
if (IS_ERR(vport))
goto exit_unlock;
reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
OVS_VPORT_CMD_NEW);
if (IS_ERR(reply)) {
err = PTR_ERR(reply);
ovs_dp_detach_port(vport);
goto exit_unlock;
}
genl_notify(reply, genl_info_net(info), info->snd_pid,
ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
exit_unlock:
rtnl_unlock();
exit:
return err;
}
static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr **a = info->attrs;
struct sk_buff *reply;
struct vport *vport;
int err;
rtnl_lock();
vport = lookup_vport(info->userhdr, a);
err = PTR_ERR(vport);
if (IS_ERR(vport))
goto exit_unlock;
err = 0;
if (a[OVS_VPORT_ATTR_TYPE] &&
nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type)
err = -EINVAL;
if (!err && a[OVS_VPORT_ATTR_OPTIONS])
err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
if (err)
goto exit_unlock;
if (a[OVS_VPORT_ATTR_UPCALL_PID])
vport->upcall_pid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
OVS_VPORT_CMD_NEW);
if (IS_ERR(reply)) {
err = PTR_ERR(reply);
netlink_set_err(init_net.genl_sock, 0,
ovs_dp_vport_multicast_group.id, err);
return 0;
}
genl_notify(reply, genl_info_net(info), info->snd_pid,
ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
exit_unlock:
rtnl_unlock();
return err;
}
static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr **a = info->attrs;
struct sk_buff *reply;
struct vport *vport;
int err;
rtnl_lock();
vport = lookup_vport(info->userhdr, a);
err = PTR_ERR(vport);
if (IS_ERR(vport))
goto exit_unlock;
if (vport->port_no == OVSP_LOCAL) {
err = -EINVAL;
goto exit_unlock;
}
reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
OVS_VPORT_CMD_DEL);
err = PTR_ERR(reply);
if (IS_ERR(reply))
goto exit_unlock;
ovs_dp_detach_port(vport);
genl_notify(reply, genl_info_net(info), info->snd_pid,
ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
exit_unlock:
rtnl_unlock();
return err;
}
static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr **a = info->attrs;
struct ovs_header *ovs_header = info->userhdr;
struct sk_buff *reply;
struct vport *vport;
int err;
rcu_read_lock();
vport = lookup_vport(ovs_header, a);
err = PTR_ERR(vport);
if (IS_ERR(vport))
goto exit_unlock;
reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
OVS_VPORT_CMD_NEW);
err = PTR_ERR(reply);
if (IS_ERR(reply))
goto exit_unlock;
rcu_read_unlock();
return genlmsg_reply(reply, info);
exit_unlock:
rcu_read_unlock();
return err;
}
static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
struct datapath *dp;
u32 port_no;
int retval;
dp = get_dp(ovs_header->dp_ifindex);
if (!dp)
return -ENODEV;
rcu_read_lock();
for (port_no = cb->args[0]; port_no < DP_MAX_PORTS; port_no++) {
struct vport *vport;
vport = rcu_dereference(dp->ports[port_no]);
if (!vport)
continue;
if (ovs_vport_cmd_fill_info(vport, skb, NETLINK_CB(cb->skb).pid,
cb->nlh->nlmsg_seq, NLM_F_MULTI,
OVS_VPORT_CMD_NEW) < 0)
break;
}
rcu_read_unlock();
cb->args[0] = port_no;
retval = skb->len;
return retval;
}
static void rehash_flow_table(struct work_struct *work)
{
struct datapath *dp;
genl_lock();
list_for_each_entry(dp, &dps, list_node) {
struct flow_table *old_table = genl_dereference(dp->table);
struct flow_table *new_table;
new_table = ovs_flow_tbl_rehash(old_table);
if (!IS_ERR(new_table)) {
rcu_assign_pointer(dp->table, new_table);
ovs_flow_tbl_deferred_destroy(old_table);
}
}
genl_unlock();
schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
}
static struct genl_ops dp_vport_genl_ops[] = {
{ .cmd = OVS_VPORT_CMD_NEW,
.flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
.policy = vport_policy,
.doit = ovs_vport_cmd_new
},
{ .cmd = OVS_VPORT_CMD_DEL,
.flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
.policy = vport_policy,
.doit = ovs_vport_cmd_del
},
{ .cmd = OVS_VPORT_CMD_GET,
.flags = 0, /* OK for unprivileged users. */
.policy = vport_policy,
.doit = ovs_vport_cmd_get,
.dumpit = ovs_vport_cmd_dump
},
{ .cmd = OVS_VPORT_CMD_SET,
.flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
.policy = vport_policy,
.doit = ovs_vport_cmd_set,
},
};
struct genl_family_and_ops {
struct genl_family *family;
struct genl_ops *ops;
int n_ops;
struct genl_multicast_group *group;
};
static const struct genl_family_and_ops dp_genl_families[] = {
{ &dp_datapath_genl_family,
dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops),
&ovs_dp_datapath_multicast_group },
{ &dp_vport_genl_family,
dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops),
&ovs_dp_vport_multicast_group },
{ &dp_flow_genl_family,
dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops),
&ovs_dp_flow_multicast_group },
{ &dp_packet_genl_family,
dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops),
NULL },
};
static void dp_unregister_genl(int n_families)
{
int i;
for (i = 0; i < n_families; i++)
genl_unregister_family(dp_genl_families[i].family);
}
static int dp_register_genl(void)
{
int n_registered;
int err;
int i;
n_registered = 0;
for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
const struct genl_family_and_ops *f = &dp_genl_families[i];
err = genl_register_family_with_ops(f->family, f->ops,
f->n_ops);
if (err)
goto error;
n_registered++;
if (f->group) {
err = genl_register_mc_group(f->family, f->group);
if (err)
goto error;
}
}
return 0;
error:
dp_unregister_genl(n_registered);
return err;
}
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));
pr_info("Open vSwitch switching datapath\n");
err = ovs_flow_init();
if (err)
goto error;
err = ovs_vport_init();
if (err)
goto error_flow_exit;
err = register_netdevice_notifier(&ovs_dp_device_notifier);
if (err)
goto error_vport_exit;
err = dp_register_genl();
if (err < 0)
goto error_unreg_notifier;
schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
return 0;
error_unreg_notifier:
unregister_netdevice_notifier(&ovs_dp_device_notifier);
error_vport_exit:
ovs_vport_exit();
error_flow_exit:
ovs_flow_exit();
error:
return err;
}
static void dp_cleanup(void)
{
cancel_delayed_work_sync(&rehash_flow_wq);
rcu_barrier();
dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
unregister_netdevice_notifier(&ovs_dp_device_notifier);
ovs_vport_exit();
ovs_flow_exit();
}
module_init(dp_init);
module_exit(dp_cleanup);
MODULE_DESCRIPTION("Open vSwitch switching datapath");
MODULE_LICENSE("GPL");
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