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linux/net/openvswitch/datapath.c
Eelco Chaudron fea07a487c net: openvswitch: silence suspicious RCU usage warning 
Silence suspicious RCU usage warning in ovs_flow_tbl_masks_cache_resize()
by replacing rcu_dereference() with rcu_dereference_ovsl().

In addition, when creating a new datapath, make sure it's configured under
the ovs_lock.

Fixes: 9bf24f594c ("net: openvswitch: make masks cache size configurable")
Reported-by: syzbot+9a8f8bfcc56e8578016c@syzkaller.appspotmail.com
Signed-off-by: Eelco Chaudron <echaudro@redhat.com>
Link: https://lore.kernel.org/r/160439190002.56943.1418882726496275961.stgit@ebuild
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2020-11-03 16:57:42 -08:00

2646 lines
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2007-2014 Nicira, Inc.
*/
#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 <net/genetlink.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
#include "datapath.h"
#include "flow.h"
#include "flow_table.h"
#include "flow_netlink.h"
#include "meter.h"
#include "vport-internal_dev.h"
#include "vport-netdev.h"
unsigned int ovs_net_id __read_mostly;
static struct genl_family dp_packet_genl_family;
static struct genl_family dp_flow_genl_family;
static struct genl_family dp_datapath_genl_family;
static const struct nla_policy flow_policy[];
static const struct genl_multicast_group ovs_dp_flow_multicast_group = {
.name = OVS_FLOW_MCGROUP,
};
static const struct genl_multicast_group ovs_dp_datapath_multicast_group = {
.name = OVS_DATAPATH_MCGROUP,
};
static const struct genl_multicast_group ovs_dp_vport_multicast_group = {
.name = OVS_VPORT_MCGROUP,
};
/* Check if need to build a reply message.
* OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */
static bool ovs_must_notify(struct genl_family *family, struct genl_info *info,
unsigned int group)
{
return info->nlhdr->nlmsg_flags & NLM_F_ECHO ||
genl_has_listeners(family, genl_info_net(info), group);
}
static void ovs_notify(struct genl_family *family,
struct sk_buff *skb, struct genl_info *info)
{
genl_notify(family, skb, info, 0, GFP_KERNEL);
}
/**
* DOC: Locking:
*
* All writes e.g. Writes to device state (add/remove datapath, port, set
* operations on vports, etc.), Writes to other state (flow table
* modifications, set miscellaneous datapath parameters, etc.) are protected
* by ovs_lock.
*
* 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.
*
* The RTNL lock nests inside ovs_mutex.
*/
static DEFINE_MUTEX(ovs_mutex);
void ovs_lock(void)
{
mutex_lock(&ovs_mutex);
}
void ovs_unlock(void)
{
mutex_unlock(&ovs_mutex);
}
#ifdef CONFIG_LOCKDEP
int lockdep_ovsl_is_held(void)
{
if (debug_locks)
return lockdep_is_held(&ovs_mutex);
else
return 1;
}
#endif
static struct vport *new_vport(const struct vport_parms *);
static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
const struct sw_flow_key *,
const struct dp_upcall_info *,
uint32_t cutlen);
static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
const struct sw_flow_key *,
const struct dp_upcall_info *,
uint32_t cutlen);
static void ovs_dp_masks_rebalance(struct work_struct *work);
/* Must be called with rcu_read_lock or ovs_mutex. */
const char *ovs_dp_name(const struct datapath *dp)
{
struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
return ovs_vport_name(vport);
}
static int get_dpifindex(const struct datapath *dp)
{
struct vport *local;
int ifindex;
rcu_read_lock();
local = ovs_vport_rcu(dp, OVSP_LOCAL);
if (local)
ifindex = local->dev->ifindex;
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(&dp->table);
free_percpu(dp->stats_percpu);
kfree(dp->ports);
ovs_meters_exit(dp);
kfree(dp);
}
static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
u16 port_no)
{
return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
}
/* Called with ovs_mutex or RCU read lock. */
struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
{
struct vport *vport;
struct hlist_head *head;
head = vport_hash_bucket(dp, port_no);
hlist_for_each_entry_rcu(vport, head, dp_hash_node,
lockdep_ovsl_is_held()) {
if (vport->port_no == port_no)
return vport;
}
return NULL;
}
/* Called with ovs_mutex. */
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;
struct hlist_head *head = vport_hash_bucket(dp, vport->port_no);
hlist_add_head_rcu(&vport->dp_hash_node, head);
}
return vport;
}
void ovs_dp_detach_port(struct vport *p)
{
ASSERT_OVSL();
/* First drop references to device. */
hlist_del_rcu(&p->dp_hash_node);
/* Then destroy it. */
ovs_vport_del(p);
}
/* Must be called with rcu_read_lock. */
void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
{
const struct vport *p = OVS_CB(skb)->input_vport;
struct datapath *dp = p->dp;
struct sw_flow *flow;
struct sw_flow_actions *sf_acts;
struct dp_stats_percpu *stats;
u64 *stats_counter;
u32 n_mask_hit;
u32 n_cache_hit;
int error;
stats = this_cpu_ptr(dp->stats_percpu);
/* Look up flow. */
flow = ovs_flow_tbl_lookup_stats(&dp->table, key, skb_get_hash(skb),
&n_mask_hit, &n_cache_hit);
if (unlikely(!flow)) {
struct dp_upcall_info upcall;
memset(&upcall, 0, sizeof(upcall));
upcall.cmd = OVS_PACKET_CMD_MISS;
upcall.portid = ovs_vport_find_upcall_portid(p, skb);
upcall.mru = OVS_CB(skb)->mru;
error = ovs_dp_upcall(dp, skb, key, &upcall, 0);
if (unlikely(error))
kfree_skb(skb);
else
consume_skb(skb);
stats_counter = &stats->n_missed;
goto out;
}
ovs_flow_stats_update(flow, key->tp.flags, skb);
sf_acts = rcu_dereference(flow->sf_acts);
error = ovs_execute_actions(dp, skb, sf_acts, key);
if (unlikely(error))
net_dbg_ratelimited("ovs: action execution error on datapath %s: %d\n",
ovs_dp_name(dp), error);
stats_counter = &stats->n_hit;
out:
/* Update datapath statistics. */
u64_stats_update_begin(&stats->syncp);
(*stats_counter)++;
stats->n_mask_hit += n_mask_hit;
stats->n_cache_hit += n_cache_hit;
u64_stats_update_end(&stats->syncp);
}
int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
const struct sw_flow_key *key,
const struct dp_upcall_info *upcall_info,
uint32_t cutlen)
{
struct dp_stats_percpu *stats;
int err;
if (upcall_info->portid == 0) {
err = -ENOTCONN;
goto err;
}
if (!skb_is_gso(skb))
err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
else
err = queue_gso_packets(dp, skb, key, upcall_info, cutlen);
if (err)
goto err;
return 0;
err:
stats = this_cpu_ptr(dp->stats_percpu);
u64_stats_update_begin(&stats->syncp);
stats->n_lost++;
u64_stats_update_end(&stats->syncp);
return err;
}
static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
const struct sw_flow_key *key,
const struct dp_upcall_info *upcall_info,
uint32_t cutlen)
{
unsigned int gso_type = skb_shinfo(skb)->gso_type;
struct sw_flow_key later_key;
struct sk_buff *segs, *nskb;
int err;
BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_GSO_CB_OFFSET);
segs = __skb_gso_segment(skb, NETIF_F_SG, false);
if (IS_ERR(segs))
return PTR_ERR(segs);
if (segs == NULL)
return -EINVAL;
if (gso_type & SKB_GSO_UDP) {
/* The initial flow key extracted by ovs_flow_key_extract()
* in this case is for a first fragment, so we need to
* properly mark later fragments.
*/
later_key = *key;
later_key.ip.frag = OVS_FRAG_TYPE_LATER;
}
/* Queue all of the segments. */
skb_list_walk_safe(segs, skb, nskb) {
if (gso_type & SKB_GSO_UDP && skb != segs)
key = &later_key;
err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
if (err)
break;
}
/* Free all of the segments. */
skb_list_walk_safe(segs, skb, nskb) {
if (err)
kfree_skb(skb);
else
consume_skb(skb);
}
return err;
}
static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
unsigned int hdrlen, int actions_attrlen)
{
size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
+ nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
+ nla_total_size(ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */
+ nla_total_size(sizeof(unsigned int)) /* OVS_PACKET_ATTR_LEN */
+ nla_total_size(sizeof(u64)); /* OVS_PACKET_ATTR_HASH */
/* OVS_PACKET_ATTR_USERDATA */
if (upcall_info->userdata)
size += NLA_ALIGN(upcall_info->userdata->nla_len);
/* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
if (upcall_info->egress_tun_info)
size += nla_total_size(ovs_tun_key_attr_size());
/* OVS_PACKET_ATTR_ACTIONS */
if (upcall_info->actions_len)
size += nla_total_size(actions_attrlen);
/* OVS_PACKET_ATTR_MRU */
if (upcall_info->mru)
size += nla_total_size(sizeof(upcall_info->mru));
return size;
}
static void pad_packet(struct datapath *dp, struct sk_buff *skb)
{
if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
size_t plen = NLA_ALIGN(skb->len) - skb->len;
if (plen > 0)
skb_put_zero(skb, plen);
}
}
static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
const struct sw_flow_key *key,
const struct dp_upcall_info *upcall_info,
uint32_t cutlen)
{
struct ovs_header *upcall;
struct sk_buff *nskb = NULL;
struct sk_buff *user_skb = NULL; /* to be queued to userspace */
struct nlattr *nla;
size_t len;
unsigned int hlen;
int err, dp_ifindex;
u64 hash;
dp_ifindex = get_dpifindex(dp);
if (!dp_ifindex)
return -ENODEV;
if (skb_vlan_tag_present(skb)) {
nskb = skb_clone(skb, GFP_ATOMIC);
if (!nskb)
return -ENOMEM;
nskb = __vlan_hwaccel_push_inside(nskb);
if (!nskb)
return -ENOMEM;
skb = nskb;
}
if (nla_attr_size(skb->len) > USHRT_MAX) {
err = -EFBIG;
goto out;
}
/* Complete checksum if needed */
if (skb->ip_summed == CHECKSUM_PARTIAL &&
(err = skb_csum_hwoffload_help(skb, 0)))
goto out;
/* Older versions of OVS user space enforce alignment of the last
* Netlink attribute to NLA_ALIGNTO which would require extensive
* padding logic. Only perform zerocopy if padding is not required.
*/
if (dp->user_features & OVS_DP_F_UNALIGNED)
hlen = skb_zerocopy_headlen(skb);
else
hlen = skb->len;
len = upcall_msg_size(upcall_info, hlen - cutlen,
OVS_CB(skb)->acts_origlen);
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);
if (!upcall) {
err = -EINVAL;
goto out;
}
upcall->dp_ifindex = dp_ifindex;
err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb);
if (err)
goto out;
if (upcall_info->userdata)
__nla_put(user_skb, OVS_PACKET_ATTR_USERDATA,
nla_len(upcall_info->userdata),
nla_data(upcall_info->userdata));
if (upcall_info->egress_tun_info) {
nla = nla_nest_start_noflag(user_skb,
OVS_PACKET_ATTR_EGRESS_TUN_KEY);
if (!nla) {
err = -EMSGSIZE;
goto out;
}
err = ovs_nla_put_tunnel_info(user_skb,
upcall_info->egress_tun_info);
if (err)
goto out;
nla_nest_end(user_skb, nla);
}
if (upcall_info->actions_len) {
nla = nla_nest_start_noflag(user_skb, OVS_PACKET_ATTR_ACTIONS);
if (!nla) {
err = -EMSGSIZE;
goto out;
}
err = ovs_nla_put_actions(upcall_info->actions,
upcall_info->actions_len,
user_skb);
if (!err)
nla_nest_end(user_skb, nla);
else
nla_nest_cancel(user_skb, nla);
}
/* Add OVS_PACKET_ATTR_MRU */
if (upcall_info->mru &&
nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU, upcall_info->mru)) {
err = -ENOBUFS;
goto out;
}
/* Add OVS_PACKET_ATTR_LEN when packet is truncated */
if (cutlen > 0 &&
nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN, skb->len)) {
err = -ENOBUFS;
goto out;
}
/* Add OVS_PACKET_ATTR_HASH */
hash = skb_get_hash_raw(skb);
if (skb->sw_hash)
hash |= OVS_PACKET_HASH_SW_BIT;
if (skb->l4_hash)
hash |= OVS_PACKET_HASH_L4_BIT;
if (nla_put(user_skb, OVS_PACKET_ATTR_HASH, sizeof (u64), &hash)) {
err = -ENOBUFS;
goto out;
}
/* Only reserve room for attribute header, packet data is added
* in skb_zerocopy() */
if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
err = -ENOBUFS;
goto out;
}
nla->nla_len = nla_attr_size(skb->len - cutlen);
err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen);
if (err)
goto out;
/* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
pad_packet(dp, user_skb);
((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid);
user_skb = NULL;
out:
if (err)
skb_tx_error(skb);
kfree_skb(user_skb);
kfree_skb(nskb);
return err;
}
static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
{
struct ovs_header *ovs_header = info->userhdr;
struct net *net = sock_net(skb->sk);
struct nlattr **a = info->attrs;
struct sw_flow_actions *acts;
struct sk_buff *packet;
struct sw_flow *flow;
struct sw_flow_actions *sf_acts;
struct datapath *dp;
struct vport *input_vport;
u16 mru = 0;
u64 hash;
int len;
int err;
bool log = !a[OVS_PACKET_ATTR_PROBE];
err = -EINVAL;
if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
!a[OVS_PACKET_ATTR_ACTIONS])
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);
nla_memcpy(__skb_put(packet, len), a[OVS_PACKET_ATTR_PACKET], len);
/* Set packet's mru */
if (a[OVS_PACKET_ATTR_MRU]) {
mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]);
packet->ignore_df = 1;
}
OVS_CB(packet)->mru = mru;
if (a[OVS_PACKET_ATTR_HASH]) {
hash = nla_get_u64(a[OVS_PACKET_ATTR_HASH]);
__skb_set_hash(packet, hash & 0xFFFFFFFFULL,
!!(hash & OVS_PACKET_HASH_SW_BIT),
!!(hash & OVS_PACKET_HASH_L4_BIT));
}
/* 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_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY],
packet, &flow->key, log);
if (err)
goto err_flow_free;
err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS],
&flow->key, &acts, log);
if (err)
goto err_flow_free;
rcu_assign_pointer(flow->sf_acts, acts);
packet->priority = flow->key.phy.priority;
packet->mark = flow->key.phy.skb_mark;
rcu_read_lock();
dp = get_dp_rcu(net, ovs_header->dp_ifindex);
err = -ENODEV;
if (!dp)
goto err_unlock;
input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
if (!input_vport)
input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
if (!input_vport)
goto err_unlock;
packet->dev = input_vport->dev;
OVS_CB(packet)->input_vport = input_vport;
sf_acts = rcu_dereference(flow->sf_acts);
local_bh_disable();
err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
local_bh_enable();
rcu_read_unlock();
ovs_flow_free(flow, false);
return err;
err_unlock:
rcu_read_unlock();
err_flow_free:
ovs_flow_free(flow, false);
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] = { .len = ETH_HLEN },
[OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
[OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
[OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
[OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 },
[OVS_PACKET_ATTR_HASH] = { .type = NLA_U64 },
};
static const struct genl_small_ops dp_packet_genl_ops[] = {
{ .cmd = OVS_PACKET_CMD_EXECUTE,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
.doit = ovs_packet_cmd_execute
}
};
static struct genl_family dp_packet_genl_family __ro_after_init = {
.hdrsize = sizeof(struct ovs_header),
.name = OVS_PACKET_FAMILY,
.version = OVS_PACKET_VERSION,
.maxattr = OVS_PACKET_ATTR_MAX,
.policy = packet_policy,
.netnsok = true,
.parallel_ops = true,
.small_ops = dp_packet_genl_ops,
.n_small_ops = ARRAY_SIZE(dp_packet_genl_ops),
.module = THIS_MODULE,
};
static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
struct ovs_dp_megaflow_stats *mega_stats)
{
int i;
memset(mega_stats, 0, sizeof(*mega_stats));
stats->n_flows = ovs_flow_tbl_count(&dp->table);
mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->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_irq(&percpu_stats->syncp);
local_stats = *percpu_stats;
} while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
stats->n_hit += local_stats.n_hit;
stats->n_missed += local_stats.n_missed;
stats->n_lost += local_stats.n_lost;
mega_stats->n_mask_hit += local_stats.n_mask_hit;
mega_stats->n_cache_hit += local_stats.n_cache_hit;
}
}
static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
{
return ovs_identifier_is_ufid(sfid) &&
!(ufid_flags & OVS_UFID_F_OMIT_KEY);
}
static bool should_fill_mask(uint32_t ufid_flags)
{
return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
}
static bool should_fill_actions(uint32_t ufid_flags)
{
return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
}
static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
const struct sw_flow_id *sfid,
uint32_t ufid_flags)
{
size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
/* OVS_FLOW_ATTR_UFID, or unmasked flow key as fallback
* see ovs_nla_put_identifier()
*/
if (sfid && ovs_identifier_is_ufid(sfid))
len += nla_total_size(sfid->ufid_len);
else
len += nla_total_size(ovs_key_attr_size());
/* OVS_FLOW_ATTR_KEY */
if (!sfid || should_fill_key(sfid, ufid_flags))
len += nla_total_size(ovs_key_attr_size());
/* OVS_FLOW_ATTR_MASK */
if (should_fill_mask(ufid_flags))
len += nla_total_size(ovs_key_attr_size());
/* OVS_FLOW_ATTR_ACTIONS */
if (should_fill_actions(ufid_flags))
len += nla_total_size(acts->orig_len);
return len
+ nla_total_size_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
+ nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
+ nla_total_size_64bit(8); /* OVS_FLOW_ATTR_USED */
}
/* Called with ovs_mutex or RCU read lock. */
static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
struct sk_buff *skb)
{
struct ovs_flow_stats stats;
__be16 tcp_flags;
unsigned long used;
ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
if (used &&
nla_put_u64_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used),
OVS_FLOW_ATTR_PAD))
return -EMSGSIZE;
if (stats.n_packets &&
nla_put_64bit(skb, OVS_FLOW_ATTR_STATS,
sizeof(struct ovs_flow_stats), &stats,
OVS_FLOW_ATTR_PAD))
return -EMSGSIZE;
if ((u8)ntohs(tcp_flags) &&
nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
return -EMSGSIZE;
return 0;
}
/* Called with ovs_mutex or RCU read lock. */
static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
struct sk_buff *skb, int skb_orig_len)
{
struct nlattr *start;
int err;
/* 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.
*/
start = nla_nest_start_noflag(skb, OVS_FLOW_ATTR_ACTIONS);
if (start) {
const struct sw_flow_actions *sf_acts;
sf_acts = rcu_dereference_ovsl(flow->sf_acts);
err = ovs_nla_put_actions(sf_acts->actions,
sf_acts->actions_len, skb);
if (!err)
nla_nest_end(skb, start);
else {
if (skb_orig_len)
return err;
nla_nest_cancel(skb, start);
}
} else if (skb_orig_len) {
return -EMSGSIZE;
}
return 0;
}
/* Called with ovs_mutex or RCU read lock. */
static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
struct sk_buff *skb, u32 portid,
u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
{
const int skb_orig_len = skb->len;
struct ovs_header *ovs_header;
int err;
ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
flags, cmd);
if (!ovs_header)
return -EMSGSIZE;
ovs_header->dp_ifindex = dp_ifindex;
err = ovs_nla_put_identifier(flow, skb);
if (err)
goto error;
if (should_fill_key(&flow->id, ufid_flags)) {
err = ovs_nla_put_masked_key(flow, skb);
if (err)
goto error;
}
if (should_fill_mask(ufid_flags)) {
err = ovs_nla_put_mask(flow, skb);
if (err)
goto error;
}
err = ovs_flow_cmd_fill_stats(flow, skb);
if (err)
goto error;
if (should_fill_actions(ufid_flags)) {
err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
if (err)
goto error;
}
genlmsg_end(skb, ovs_header);
return 0;
error:
genlmsg_cancel(skb, ovs_header);
return err;
}
/* May not be called with RCU read lock. */
static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
const struct sw_flow_id *sfid,
struct genl_info *info,
bool always,
uint32_t ufid_flags)
{
struct sk_buff *skb;
size_t len;
if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0))
return NULL;
len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
skb = genlmsg_new(len, GFP_KERNEL);
if (!skb)
return ERR_PTR(-ENOMEM);
return skb;
}
/* Called with ovs_mutex. */
static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
int dp_ifindex,
struct genl_info *info, u8 cmd,
bool always, u32 ufid_flags)
{
struct sk_buff *skb;
int retval;
skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
&flow->id, info, always, ufid_flags);
if (IS_ERR_OR_NULL(skb))
return skb;
retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
info->snd_portid, info->snd_seq, 0,
cmd, ufid_flags);
if (WARN_ON_ONCE(retval < 0)) {
kfree_skb(skb);
skb = ERR_PTR(retval);
}
return skb;
}
static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
{
struct net *net = sock_net(skb->sk);
struct nlattr **a = info->attrs;
struct ovs_header *ovs_header = info->userhdr;
struct sw_flow *flow = NULL, *new_flow;
struct sw_flow_mask mask;
struct sk_buff *reply;
struct datapath *dp;
struct sw_flow_actions *acts;
struct sw_flow_match match;
u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
int error;
bool log = !a[OVS_FLOW_ATTR_PROBE];
/* Must have key and actions. */
error = -EINVAL;
if (!a[OVS_FLOW_ATTR_KEY]) {
OVS_NLERR(log, "Flow key attr not present in new flow.");
goto error;
}
if (!a[OVS_FLOW_ATTR_ACTIONS]) {
OVS_NLERR(log, "Flow actions attr not present in new flow.");
goto error;
}
/* Most of the time we need to allocate a new flow, do it before
* locking.
*/
new_flow = ovs_flow_alloc();
if (IS_ERR(new_flow)) {
error = PTR_ERR(new_flow);
goto error;
}
/* Extract key. */
ovs_match_init(&match, &new_flow->key, false, &mask);
error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
a[OVS_FLOW_ATTR_MASK], log);
if (error)
goto err_kfree_flow;
/* Extract flow identifier. */
error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID],
&new_flow->key, log);
if (error)
goto err_kfree_flow;
/* unmasked key is needed to match when ufid is not used. */
if (ovs_identifier_is_key(&new_flow->id))
match.key = new_flow->id.unmasked_key;
ovs_flow_mask_key(&new_flow->key, &new_flow->key, true, &mask);
/* Validate actions. */
error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS],
&new_flow->key, &acts, log);
if (error) {
OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
goto err_kfree_flow;
}
reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false,
ufid_flags);
if (IS_ERR(reply)) {
error = PTR_ERR(reply);
goto err_kfree_acts;
}
ovs_lock();
dp = get_dp(net, ovs_header->dp_ifindex);
if (unlikely(!dp)) {
error = -ENODEV;
goto err_unlock_ovs;
}
/* Check if this is a duplicate flow */
if (ovs_identifier_is_ufid(&new_flow->id))
flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
if (!flow)
flow = ovs_flow_tbl_lookup(&dp->table, &new_flow->key);
if (likely(!flow)) {
rcu_assign_pointer(new_flow->sf_acts, acts);
/* Put flow in bucket. */
error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask);
if (unlikely(error)) {
acts = NULL;
goto err_unlock_ovs;
}
if (unlikely(reply)) {
error = ovs_flow_cmd_fill_info(new_flow,
ovs_header->dp_ifindex,
reply, info->snd_portid,
info->snd_seq, 0,
OVS_FLOW_CMD_NEW,
ufid_flags);
BUG_ON(error < 0);
}
ovs_unlock();
} else {
struct sw_flow_actions *old_acts;
/* 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.
*/
if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
| NLM_F_EXCL))) {
error = -EEXIST;
goto err_unlock_ovs;
}
/* The flow identifier has to be the same for flow updates.
* Look for any overlapping flow.
*/
if (unlikely(!ovs_flow_cmp(flow, &match))) {
if (ovs_identifier_is_key(&flow->id))
flow = ovs_flow_tbl_lookup_exact(&dp->table,
&match);
else /* UFID matches but key is different */
flow = NULL;
if (!flow) {
error = -ENOENT;
goto err_unlock_ovs;
}
}
/* Update actions. */
old_acts = ovsl_dereference(flow->sf_acts);
rcu_assign_pointer(flow->sf_acts, acts);
if (unlikely(reply)) {
error = ovs_flow_cmd_fill_info(flow,
ovs_header->dp_ifindex,
reply, info->snd_portid,
info->snd_seq, 0,
OVS_FLOW_CMD_NEW,
ufid_flags);
BUG_ON(error < 0);
}
ovs_unlock();
ovs_nla_free_flow_actions_rcu(old_acts);
ovs_flow_free(new_flow, false);
}
if (reply)
ovs_notify(&dp_flow_genl_family, reply, info);
return 0;
err_unlock_ovs:
ovs_unlock();
kfree_skb(reply);
err_kfree_acts:
ovs_nla_free_flow_actions(acts);
err_kfree_flow:
ovs_flow_free(new_flow, false);
error:
return error;
}
/* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
static noinline_for_stack
struct sw_flow_actions *get_flow_actions(struct net *net,
const struct nlattr *a,
const struct sw_flow_key *key,
const struct sw_flow_mask *mask,
bool log)
{
struct sw_flow_actions *acts;
struct sw_flow_key masked_key;
int error;
ovs_flow_mask_key(&masked_key, key, true, mask);
error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log);
if (error) {
OVS_NLERR(log,
"Actions may not be safe on all matching packets");
return ERR_PTR(error);
}
return acts;
}
/* Factor out match-init and action-copy to avoid
* "Wframe-larger-than=1024" warning. Because mask is only
* used to get actions, we new a function to save some
* stack space.
*
* If there are not key and action attrs, we return 0
* directly. In the case, the caller will also not use the
* match as before. If there is action attr, we try to get
* actions and save them to *acts. Before returning from
* the function, we reset the match->mask pointer. Because
* we should not to return match object with dangling reference
* to mask.
* */
static noinline_for_stack int
ovs_nla_init_match_and_action(struct net *net,
struct sw_flow_match *match,
struct sw_flow_key *key,
struct nlattr **a,
struct sw_flow_actions **acts,
bool log)
{
struct sw_flow_mask mask;
int error = 0;
if (a[OVS_FLOW_ATTR_KEY]) {
ovs_match_init(match, key, true, &mask);
error = ovs_nla_get_match(net, match, a[OVS_FLOW_ATTR_KEY],
a[OVS_FLOW_ATTR_MASK], log);
if (error)
goto error;
}
if (a[OVS_FLOW_ATTR_ACTIONS]) {
if (!a[OVS_FLOW_ATTR_KEY]) {
OVS_NLERR(log,
"Flow key attribute not present in set flow.");
error = -EINVAL;
goto error;
}
*acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], key,
&mask, log);
if (IS_ERR(*acts)) {
error = PTR_ERR(*acts);
goto error;
}
}
/* On success, error is 0. */
error:
match->mask = NULL;
return error;
}
static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
{
struct net *net = sock_net(skb->sk);
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 = NULL;
struct datapath *dp;
struct sw_flow_actions *old_acts = NULL, *acts = NULL;
struct sw_flow_match match;
struct sw_flow_id sfid;
u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
int error = 0;
bool log = !a[OVS_FLOW_ATTR_PROBE];
bool ufid_present;
ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) {
OVS_NLERR(log,
"Flow set message rejected, Key attribute missing.");
return -EINVAL;
}
error = ovs_nla_init_match_and_action(net, &match, &key, a,
&acts, log);
if (error)
goto error;
if (acts) {
/* Can allocate before locking if have acts. */
reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false,
ufid_flags);
if (IS_ERR(reply)) {
error = PTR_ERR(reply);
goto err_kfree_acts;
}
}
ovs_lock();
dp = get_dp(net, ovs_header->dp_ifindex);
if (unlikely(!dp)) {
error = -ENODEV;
goto err_unlock_ovs;
}
/* Check that the flow exists. */
if (ufid_present)
flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
else
flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
if (unlikely(!flow)) {
error = -ENOENT;
goto err_unlock_ovs;
}
/* Update actions, if present. */
if (likely(acts)) {
old_acts = ovsl_dereference(flow->sf_acts);
rcu_assign_pointer(flow->sf_acts, acts);
if (unlikely(reply)) {
error = ovs_flow_cmd_fill_info(flow,
ovs_header->dp_ifindex,
reply, info->snd_portid,
info->snd_seq, 0,
OVS_FLOW_CMD_SET,
ufid_flags);
BUG_ON(error < 0);
}
} else {
/* Could not alloc without acts before locking. */
reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex,
info, OVS_FLOW_CMD_SET, false,
ufid_flags);
if (IS_ERR(reply)) {
error = PTR_ERR(reply);
goto err_unlock_ovs;
}
}
/* Clear stats. */
if (a[OVS_FLOW_ATTR_CLEAR])
ovs_flow_stats_clear(flow);
ovs_unlock();
if (reply)
ovs_notify(&dp_flow_genl_family, reply, info);
if (old_acts)
ovs_nla_free_flow_actions_rcu(old_acts);
return 0;
err_unlock_ovs:
ovs_unlock();
kfree_skb(reply);
err_kfree_acts:
ovs_nla_free_flow_actions(acts);
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 net *net = sock_net(skb->sk);
struct sw_flow_key key;
struct sk_buff *reply;
struct sw_flow *flow;
struct datapath *dp;
struct sw_flow_match match;
struct sw_flow_id ufid;
u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
int err = 0;
bool log = !a[OVS_FLOW_ATTR_PROBE];
bool ufid_present;
ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
if (a[OVS_FLOW_ATTR_KEY]) {
ovs_match_init(&match, &key, true, NULL);
err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL,
log);
} else if (!ufid_present) {
OVS_NLERR(log,
"Flow get message rejected, Key attribute missing.");
err = -EINVAL;
}
if (err)
return err;
ovs_lock();
dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
if (!dp) {
err = -ENODEV;
goto unlock;
}
if (ufid_present)
flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
else
flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
if (!flow) {
err = -ENOENT;
goto unlock;
}
reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info,
OVS_FLOW_CMD_GET, true, ufid_flags);
if (IS_ERR(reply)) {
err = PTR_ERR(reply);
goto unlock;
}
ovs_unlock();
return genlmsg_reply(reply, info);
unlock:
ovs_unlock();
return err;
}
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 net *net = sock_net(skb->sk);
struct sw_flow_key key;
struct sk_buff *reply;
struct sw_flow *flow = NULL;
struct datapath *dp;
struct sw_flow_match match;
struct sw_flow_id ufid;
u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
int err;
bool log = !a[OVS_FLOW_ATTR_PROBE];
bool ufid_present;
ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
if (a[OVS_FLOW_ATTR_KEY]) {
ovs_match_init(&match, &key, true, NULL);
err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY],
NULL, log);
if (unlikely(err))
return err;
}
ovs_lock();
dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
if (unlikely(!dp)) {
err = -ENODEV;
goto unlock;
}
if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
err = ovs_flow_tbl_flush(&dp->table);
goto unlock;
}
if (ufid_present)
flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
else
flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
if (unlikely(!flow)) {
err = -ENOENT;
goto unlock;
}
ovs_flow_tbl_remove(&dp->table, flow);
ovs_unlock();
reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts,
&flow->id, info, false, ufid_flags);
if (likely(reply)) {
if (!IS_ERR(reply)) {
rcu_read_lock(); /*To keep RCU checker happy. */
err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex,
reply, info->snd_portid,
info->snd_seq, 0,
OVS_FLOW_CMD_DEL,
ufid_flags);
rcu_read_unlock();
if (WARN_ON_ONCE(err < 0)) {
kfree_skb(reply);
goto out_free;
}
ovs_notify(&dp_flow_genl_family, reply, info);
} else {
netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0,
PTR_ERR(reply));
}
}
out_free:
ovs_flow_free(flow, true);
return 0;
unlock:
ovs_unlock();
return err;
}
static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
struct nlattr *a[__OVS_FLOW_ATTR_MAX];
struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
struct table_instance *ti;
struct datapath *dp;
u32 ufid_flags;
int err;
err = genlmsg_parse_deprecated(cb->nlh, &dp_flow_genl_family, a,
OVS_FLOW_ATTR_MAX, flow_policy, NULL);
if (err)
return err;
ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]);
rcu_read_lock();
dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
if (!dp) {
rcu_read_unlock();
return -ENODEV;
}
ti = rcu_dereference(dp->table.ti);
for (;;) {
struct sw_flow *flow;
u32 bucket, obj;
bucket = cb->args[0];
obj = cb->args[1];
flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj);
if (!flow)
break;
if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb,
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq, NLM_F_MULTI,
OVS_FLOW_CMD_GET, ufid_flags) < 0)
break;
cb->args[0] = bucket;
cb->args[1] = obj;
}
rcu_read_unlock();
return skb->len;
}
static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
[OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
[OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
[OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
[OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
[OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
[OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
[OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
};
static const struct genl_small_ops dp_flow_genl_ops[] = {
{ .cmd = OVS_FLOW_CMD_NEW,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
.doit = ovs_flow_cmd_new
},
{ .cmd = OVS_FLOW_CMD_DEL,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
.doit = ovs_flow_cmd_del
},
{ .cmd = OVS_FLOW_CMD_GET,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.flags = 0, /* OK for unprivileged users. */
.doit = ovs_flow_cmd_get,
.dumpit = ovs_flow_cmd_dump
},
{ .cmd = OVS_FLOW_CMD_SET,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
.doit = ovs_flow_cmd_set,
},
};
static struct genl_family dp_flow_genl_family __ro_after_init = {
.hdrsize = sizeof(struct ovs_header),
.name = OVS_FLOW_FAMILY,
.version = OVS_FLOW_VERSION,
.maxattr = OVS_FLOW_ATTR_MAX,
.policy = flow_policy,
.netnsok = true,
.parallel_ops = true,
.small_ops = dp_flow_genl_ops,
.n_small_ops = ARRAY_SIZE(dp_flow_genl_ops),
.mcgrps = &ovs_dp_flow_multicast_group,
.n_mcgrps = 1,
.module = THIS_MODULE,
};
static size_t ovs_dp_cmd_msg_size(void)
{
size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
msgsize += nla_total_size(IFNAMSIZ);
msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats));
msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats));
msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_MASKS_CACHE_SIZE */
return msgsize;
}
/* Called with ovs_mutex. */
static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
u32 portid, u32 seq, u32 flags, u8 cmd)
{
struct ovs_header *ovs_header;
struct ovs_dp_stats dp_stats;
struct ovs_dp_megaflow_stats dp_megaflow_stats;
int err;
ovs_header = genlmsg_put(skb, portid, seq, &dp_datapath_genl_family,
flags, cmd);
if (!ovs_header)
goto error;
ovs_header->dp_ifindex = get_dpifindex(dp);
err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp));
if (err)
goto nla_put_failure;
get_dp_stats(dp, &dp_stats, &dp_megaflow_stats);
if (nla_put_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats),
&dp_stats, OVS_DP_ATTR_PAD))
goto nla_put_failure;
if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS,
sizeof(struct ovs_dp_megaflow_stats),
&dp_megaflow_stats, OVS_DP_ATTR_PAD))
goto nla_put_failure;
if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
goto nla_put_failure;
if (nla_put_u32(skb, OVS_DP_ATTR_MASKS_CACHE_SIZE,
ovs_flow_tbl_masks_cache_size(&dp->table)))
goto nla_put_failure;
genlmsg_end(skb, ovs_header);
return 0;
nla_put_failure:
genlmsg_cancel(skb, ovs_header);
error:
return -EMSGSIZE;
}
static struct sk_buff *ovs_dp_cmd_alloc_info(void)
{
return genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL);
}
/* Called with rcu_read_lock or ovs_mutex. */
static struct datapath *lookup_datapath(struct net *net,
const 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(net, ovs_header->dp_ifindex);
else {
struct vport *vport;
vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
}
return dp ? dp : ERR_PTR(-ENODEV);
}
static void ovs_dp_reset_user_features(struct sk_buff *skb,
struct genl_info *info)
{
struct datapath *dp;
dp = lookup_datapath(sock_net(skb->sk), info->userhdr,
info->attrs);
if (IS_ERR(dp))
return;
WARN(dp->user_features, "Dropping previously announced user features\n");
dp->user_features = 0;
}
DEFINE_STATIC_KEY_FALSE(tc_recirc_sharing_support);
static int ovs_dp_change(struct datapath *dp, struct nlattr *a[])
{
u32 user_features = 0;
if (a[OVS_DP_ATTR_USER_FEATURES]) {
user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
if (user_features & ~(OVS_DP_F_VPORT_PIDS |
OVS_DP_F_UNALIGNED |
OVS_DP_F_TC_RECIRC_SHARING))
return -EOPNOTSUPP;
#if !IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
if (user_features & OVS_DP_F_TC_RECIRC_SHARING)
return -EOPNOTSUPP;
#endif
}
if (a[OVS_DP_ATTR_MASKS_CACHE_SIZE]) {
int err;
u32 cache_size;
cache_size = nla_get_u32(a[OVS_DP_ATTR_MASKS_CACHE_SIZE]);
err = ovs_flow_tbl_masks_cache_resize(&dp->table, cache_size);
if (err)
return err;
}
dp->user_features = user_features;
if (dp->user_features & OVS_DP_F_TC_RECIRC_SHARING)
static_branch_enable(&tc_recirc_sharing_support);
else
static_branch_disable(&tc_recirc_sharing_support);
return 0;
}
static int ovs_dp_stats_init(struct datapath *dp)
{
dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
if (!dp->stats_percpu)
return -ENOMEM;
return 0;
}
static int ovs_dp_vport_init(struct datapath *dp)
{
int i;
dp->ports = kmalloc_array(DP_VPORT_HASH_BUCKETS,
sizeof(struct hlist_head),
GFP_KERNEL);
if (!dp->ports)
return -ENOMEM;
for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
INIT_HLIST_HEAD(&dp->ports[i]);
return 0;
}
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;
struct ovs_net *ovs_net;
int err;
err = -EINVAL;
if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
goto err;
reply = ovs_dp_cmd_alloc_info();
if (!reply)
return -ENOMEM;
err = -ENOMEM;
dp = kzalloc(sizeof(*dp), GFP_KERNEL);
if (dp == NULL)
goto err_destroy_reply;
ovs_dp_set_net(dp, sock_net(skb->sk));
/* Allocate table. */
err = ovs_flow_tbl_init(&dp->table);
if (err)
goto err_destroy_dp;
err = ovs_dp_stats_init(dp);
if (err)
goto err_destroy_table;
err = ovs_dp_vport_init(dp);
if (err)
goto err_destroy_stats;
err = ovs_meters_init(dp);
if (err)
goto err_destroy_ports;
/* 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_portids = a[OVS_DP_ATTR_UPCALL_PID];
/* So far only local changes have been made, now need the lock. */
ovs_lock();
err = ovs_dp_change(dp, a);
if (err)
goto err_unlock_and_destroy_meters;
vport = new_vport(&parms);
if (IS_ERR(vport)) {
err = PTR_ERR(vport);
if (err == -EBUSY)
err = -EEXIST;
if (err == -EEXIST) {
/* An outdated user space instance that does not understand
* the concept of user_features has attempted to create a new
* datapath and is likely to reuse it. Drop all user features.
*/
if (info->genlhdr->version < OVS_DP_VER_FEATURES)
ovs_dp_reset_user_features(skb, info);
}
goto err_unlock_and_destroy_meters;
}
err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
info->snd_seq, 0, OVS_DP_CMD_NEW);
BUG_ON(err < 0);
ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
list_add_tail_rcu(&dp->list_node, &ovs_net->dps);
ovs_unlock();
ovs_notify(&dp_datapath_genl_family, reply, info);
return 0;
err_unlock_and_destroy_meters:
ovs_unlock();
ovs_meters_exit(dp);
err_destroy_ports:
kfree(dp->ports);
err_destroy_stats:
free_percpu(dp->stats_percpu);
err_destroy_table:
ovs_flow_tbl_destroy(&dp->table);
err_destroy_dp:
kfree(dp);
err_destroy_reply:
kfree_skb(reply);
err:
return err;
}
/* Called with ovs_mutex. */
static void __dp_destroy(struct datapath *dp)
{
struct flow_table *table = &dp->table;
int i;
for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
struct vport *vport;
struct hlist_node *n;
hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
if (vport->port_no != OVSP_LOCAL)
ovs_dp_detach_port(vport);
}
list_del_rcu(&dp->list_node);
/* OVSP_LOCAL is datapath internal port. We need to make sure that
* all ports in datapath are destroyed first before freeing datapath.
*/
ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
/* Flush sw_flow in the tables. RCU cb only releases resource
* such as dp, ports and tables. That may avoid some issues
* such as RCU usage warning.
*/
table_instance_flow_flush(table, ovsl_dereference(table->ti),
ovsl_dereference(table->ufid_ti));
/* RCU destroy the ports, meters and flow tables. */
call_rcu(&dp->rcu, destroy_dp_rcu);
}
static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
{
struct sk_buff *reply;
struct datapath *dp;
int err;
reply = ovs_dp_cmd_alloc_info();
if (!reply)
return -ENOMEM;
ovs_lock();
dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
err = PTR_ERR(dp);
if (IS_ERR(dp))
goto err_unlock_free;
err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
info->snd_seq, 0, OVS_DP_CMD_DEL);
BUG_ON(err < 0);
__dp_destroy(dp);
ovs_unlock();
ovs_notify(&dp_datapath_genl_family, reply, info);
return 0;
err_unlock_free:
ovs_unlock();
kfree_skb(reply);
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;
reply = ovs_dp_cmd_alloc_info();
if (!reply)
return -ENOMEM;
ovs_lock();
dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
err = PTR_ERR(dp);
if (IS_ERR(dp))
goto err_unlock_free;
err = ovs_dp_change(dp, info->attrs);
if (err)
goto err_unlock_free;
err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
info->snd_seq, 0, OVS_DP_CMD_SET);
BUG_ON(err < 0);
ovs_unlock();
ovs_notify(&dp_datapath_genl_family, reply, info);
return 0;
err_unlock_free:
ovs_unlock();
kfree_skb(reply);
return err;
}
static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
{
struct sk_buff *reply;
struct datapath *dp;
int err;
reply = ovs_dp_cmd_alloc_info();
if (!reply)
return -ENOMEM;
ovs_lock();
dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
if (IS_ERR(dp)) {
err = PTR_ERR(dp);
goto err_unlock_free;
}
err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid,
info->snd_seq, 0, OVS_DP_CMD_GET);
BUG_ON(err < 0);
ovs_unlock();
return genlmsg_reply(reply, info);
err_unlock_free:
ovs_unlock();
kfree_skb(reply);
return err;
}
static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
struct datapath *dp;
int skip = cb->args[0];
int i = 0;
ovs_lock();
list_for_each_entry(dp, &ovs_net->dps, list_node) {
if (i >= skip &&
ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq, NLM_F_MULTI,
OVS_DP_CMD_GET) < 0)
break;
i++;
}
ovs_unlock();
cb->args[0] = i;
return skb->len;
}
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 },
[OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
[OVS_DP_ATTR_MASKS_CACHE_SIZE] = NLA_POLICY_RANGE(NLA_U32, 0,
PCPU_MIN_UNIT_SIZE / sizeof(struct mask_cache_entry)),
};
static const struct genl_small_ops dp_datapath_genl_ops[] = {
{ .cmd = OVS_DP_CMD_NEW,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
.doit = ovs_dp_cmd_new
},
{ .cmd = OVS_DP_CMD_DEL,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
.doit = ovs_dp_cmd_del
},
{ .cmd = OVS_DP_CMD_GET,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.flags = 0, /* OK for unprivileged users. */
.doit = ovs_dp_cmd_get,
.dumpit = ovs_dp_cmd_dump
},
{ .cmd = OVS_DP_CMD_SET,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
.doit = ovs_dp_cmd_set,
},
};
static struct genl_family dp_datapath_genl_family __ro_after_init = {
.hdrsize = sizeof(struct ovs_header),
.name = OVS_DATAPATH_FAMILY,
.version = OVS_DATAPATH_VERSION,
.maxattr = OVS_DP_ATTR_MAX,
.policy = datapath_policy,
.netnsok = true,
.parallel_ops = true,
.small_ops = dp_datapath_genl_ops,
.n_small_ops = ARRAY_SIZE(dp_datapath_genl_ops),
.mcgrps = &ovs_dp_datapath_multicast_group,
.n_mcgrps = 1,
.module = THIS_MODULE,
};
/* Called with ovs_mutex or RCU read lock. */
static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
struct net *net, u32 portid, u32 seq,
u32 flags, u8 cmd, gfp_t gfp)
{
struct ovs_header *ovs_header;
struct ovs_vport_stats vport_stats;
int err;
ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family,
flags, cmd);
if (!ovs_header)
return -EMSGSIZE;
ovs_header->dp_ifindex = get_dpifindex(vport->dp);
if (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,
ovs_vport_name(vport)) ||
nla_put_u32(skb, OVS_VPORT_ATTR_IFINDEX, vport->dev->ifindex))
goto nla_put_failure;
if (!net_eq(net, dev_net(vport->dev))) {
int id = peernet2id_alloc(net, dev_net(vport->dev), gfp);
if (nla_put_s32(skb, OVS_VPORT_ATTR_NETNSID, id))
goto nla_put_failure;
}
ovs_vport_get_stats(vport, &vport_stats);
if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS,
sizeof(struct ovs_vport_stats), &vport_stats,
OVS_VPORT_ATTR_PAD))
goto nla_put_failure;
if (ovs_vport_get_upcall_portids(vport, skb))
goto nla_put_failure;
err = ovs_vport_get_options(vport, skb);
if (err == -EMSGSIZE)
goto error;
genlmsg_end(skb, ovs_header);
return 0;
nla_put_failure:
err = -EMSGSIZE;
error:
genlmsg_cancel(skb, ovs_header);
return err;
}
static struct sk_buff *ovs_vport_cmd_alloc_info(void)
{
return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
}
/* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net,
u32 portid, 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_vport_cmd_fill_info(vport, skb, net, portid, seq, 0, cmd,
GFP_KERNEL);
BUG_ON(retval < 0);
return skb;
}
/* Called with ovs_mutex or RCU read lock. */
static struct vport *lookup_vport(struct net *net,
const struct ovs_header *ovs_header,
struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
{
struct datapath *dp;
struct vport *vport;
if (a[OVS_VPORT_ATTR_IFINDEX])
return ERR_PTR(-EOPNOTSUPP);
if (a[OVS_VPORT_ATTR_NAME]) {
vport = ovs_vport_locate(net, 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(net, ovs_header->dp_ifindex);
if (!dp)
return ERR_PTR(-ENODEV);
vport = ovs_vport_ovsl_rcu(dp, port_no);
if (!vport)
return ERR_PTR(-ENODEV);
return vport;
} else
return ERR_PTR(-EINVAL);
}
static unsigned int ovs_get_max_headroom(struct datapath *dp)
{
unsigned int dev_headroom, max_headroom = 0;
struct net_device *dev;
struct vport *vport;
int i;
for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node,
lockdep_ovsl_is_held()) {
dev = vport->dev;
dev_headroom = netdev_get_fwd_headroom(dev);
if (dev_headroom > max_headroom)
max_headroom = dev_headroom;
}
}
return max_headroom;
}
/* Called with ovs_mutex */
static void ovs_update_headroom(struct datapath *dp, unsigned int new_headroom)
{
struct vport *vport;
int i;
dp->max_headroom = new_headroom;
for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node,
lockdep_ovsl_is_held())
netdev_set_rx_headroom(vport->dev, new_headroom);
}
}
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;
unsigned int new_headroom;
u32 port_no;
int err;
if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
!a[OVS_VPORT_ATTR_UPCALL_PID])
return -EINVAL;
if (a[OVS_VPORT_ATTR_IFINDEX])
return -EOPNOTSUPP;
port_no = a[OVS_VPORT_ATTR_PORT_NO]
? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0;
if (port_no >= DP_MAX_PORTS)
return -EFBIG;
reply = ovs_vport_cmd_alloc_info();
if (!reply)
return -ENOMEM;
ovs_lock();
restart:
dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
err = -ENODEV;
if (!dp)
goto exit_unlock_free;
if (port_no) {
vport = ovs_vport_ovsl(dp, port_no);
err = -EBUSY;
if (vport)
goto exit_unlock_free;
} else {
for (port_no = 1; ; port_no++) {
if (port_no >= DP_MAX_PORTS) {
err = -EFBIG;
goto exit_unlock_free;
}
vport = ovs_vport_ovsl(dp, 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_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
vport = new_vport(&parms);
err = PTR_ERR(vport);
if (IS_ERR(vport)) {
if (err == -EAGAIN)
goto restart;
goto exit_unlock_free;
}
err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
info->snd_portid, info->snd_seq, 0,
OVS_VPORT_CMD_NEW, GFP_KERNEL);
new_headroom = netdev_get_fwd_headroom(vport->dev);
if (new_headroom > dp->max_headroom)
ovs_update_headroom(dp, new_headroom);
else
netdev_set_rx_headroom(vport->dev, dp->max_headroom);
BUG_ON(err < 0);
ovs_unlock();
ovs_notify(&dp_vport_genl_family, reply, info);
return 0;
exit_unlock_free:
ovs_unlock();
kfree_skb(reply);
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;
reply = ovs_vport_cmd_alloc_info();
if (!reply)
return -ENOMEM;
ovs_lock();
vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
err = PTR_ERR(vport);
if (IS_ERR(vport))
goto exit_unlock_free;
if (a[OVS_VPORT_ATTR_TYPE] &&
nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
err = -EINVAL;
goto exit_unlock_free;
}
if (a[OVS_VPORT_ATTR_OPTIONS]) {
err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
if (err)
goto exit_unlock_free;
}
if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
err = ovs_vport_set_upcall_portids(vport, ids);
if (err)
goto exit_unlock_free;
}
err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
info->snd_portid, info->snd_seq, 0,
OVS_VPORT_CMD_SET, GFP_KERNEL);
BUG_ON(err < 0);
ovs_unlock();
ovs_notify(&dp_vport_genl_family, reply, info);
return 0;
exit_unlock_free:
ovs_unlock();
kfree_skb(reply);
return err;
}
static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
{
bool update_headroom = false;
struct nlattr **a = info->attrs;
struct sk_buff *reply;
struct datapath *dp;
struct vport *vport;
unsigned int new_headroom;
int err;
reply = ovs_vport_cmd_alloc_info();
if (!reply)
return -ENOMEM;
ovs_lock();
vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
err = PTR_ERR(vport);
if (IS_ERR(vport))
goto exit_unlock_free;
if (vport->port_no == OVSP_LOCAL) {
err = -EINVAL;
goto exit_unlock_free;
}
err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
info->snd_portid, info->snd_seq, 0,
OVS_VPORT_CMD_DEL, GFP_KERNEL);
BUG_ON(err < 0);
/* the vport deletion may trigger dp headroom update */
dp = vport->dp;
if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom)
update_headroom = true;
netdev_reset_rx_headroom(vport->dev);
ovs_dp_detach_port(vport);
if (update_headroom) {
new_headroom = ovs_get_max_headroom(dp);
if (new_headroom < dp->max_headroom)
ovs_update_headroom(dp, new_headroom);
}
ovs_unlock();
ovs_notify(&dp_vport_genl_family, reply, info);
return 0;
exit_unlock_free:
ovs_unlock();
kfree_skb(reply);
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;
reply = ovs_vport_cmd_alloc_info();
if (!reply)
return -ENOMEM;
rcu_read_lock();
vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
err = PTR_ERR(vport);
if (IS_ERR(vport))
goto exit_unlock_free;
err = ovs_vport_cmd_fill_info(vport, reply, genl_info_net(info),
info->snd_portid, info->snd_seq, 0,
OVS_VPORT_CMD_GET, GFP_ATOMIC);
BUG_ON(err < 0);
rcu_read_unlock();
return genlmsg_reply(reply, info);
exit_unlock_free:
rcu_read_unlock();
kfree_skb(reply);
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;
int bucket = cb->args[0], skip = cb->args[1];
int i, j = 0;
rcu_read_lock();
dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
if (!dp) {
rcu_read_unlock();
return -ENODEV;
}
for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
struct vport *vport;
j = 0;
hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
if (j >= skip &&
ovs_vport_cmd_fill_info(vport, skb,
sock_net(skb->sk),
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq,
NLM_F_MULTI,
OVS_VPORT_CMD_GET,
GFP_ATOMIC) < 0)
goto out;
j++;
}
skip = 0;
}
out:
rcu_read_unlock();
cb->args[0] = i;
cb->args[1] = j;
return skb->len;
}
static void ovs_dp_masks_rebalance(struct work_struct *work)
{
struct ovs_net *ovs_net = container_of(work, struct ovs_net,
masks_rebalance.work);
struct datapath *dp;
ovs_lock();
list_for_each_entry(dp, &ovs_net->dps, list_node)
ovs_flow_masks_rebalance(&dp->table);
ovs_unlock();
schedule_delayed_work(&ovs_net->masks_rebalance,
msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL));
}
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_UNSPEC },
[OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
[OVS_VPORT_ATTR_IFINDEX] = { .type = NLA_U32 },
[OVS_VPORT_ATTR_NETNSID] = { .type = NLA_S32 },
};
static const struct genl_small_ops dp_vport_genl_ops[] = {
{ .cmd = OVS_VPORT_CMD_NEW,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
.doit = ovs_vport_cmd_new
},
{ .cmd = OVS_VPORT_CMD_DEL,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
.doit = ovs_vport_cmd_del
},
{ .cmd = OVS_VPORT_CMD_GET,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.flags = 0, /* OK for unprivileged users. */
.doit = ovs_vport_cmd_get,
.dumpit = ovs_vport_cmd_dump
},
{ .cmd = OVS_VPORT_CMD_SET,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
.doit = ovs_vport_cmd_set,
},
};
struct genl_family dp_vport_genl_family __ro_after_init = {
.hdrsize = sizeof(struct ovs_header),
.name = OVS_VPORT_FAMILY,
.version = OVS_VPORT_VERSION,
.maxattr = OVS_VPORT_ATTR_MAX,
.policy = vport_policy,
.netnsok = true,
.parallel_ops = true,
.small_ops = dp_vport_genl_ops,
.n_small_ops = ARRAY_SIZE(dp_vport_genl_ops),
.mcgrps = &ovs_dp_vport_multicast_group,
.n_mcgrps = 1,
.module = THIS_MODULE,
};
static struct genl_family * const dp_genl_families[] = {
&dp_datapath_genl_family,
&dp_vport_genl_family,
&dp_flow_genl_family,
&dp_packet_genl_family,
&dp_meter_genl_family,
#if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
&dp_ct_limit_genl_family,
#endif
};
static void dp_unregister_genl(int n_families)
{
int i;
for (i = 0; i < n_families; i++)
genl_unregister_family(dp_genl_families[i]);
}
static int __init dp_register_genl(void)
{
int err;
int i;
for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
err = genl_register_family(dp_genl_families[i]);
if (err)
goto error;
}
return 0;
error:
dp_unregister_genl(i);
return err;
}
static int __net_init ovs_init_net(struct net *net)
{
struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
int err;
INIT_LIST_HEAD(&ovs_net->dps);
INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
INIT_DELAYED_WORK(&ovs_net->masks_rebalance, ovs_dp_masks_rebalance);
err = ovs_ct_init(net);
if (err)
return err;
schedule_delayed_work(&ovs_net->masks_rebalance,
msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL));
return 0;
}
static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
struct list_head *head)
{
struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
struct datapath *dp;
list_for_each_entry(dp, &ovs_net->dps, list_node) {
int i;
for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
struct vport *vport;
hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
continue;
if (dev_net(vport->dev) == dnet)
list_add(&vport->detach_list, head);
}
}
}
}
static void __net_exit ovs_exit_net(struct net *dnet)
{
struct datapath *dp, *dp_next;
struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id);
struct vport *vport, *vport_next;
struct net *net;
LIST_HEAD(head);
ovs_lock();
ovs_ct_exit(dnet);
list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
__dp_destroy(dp);
down_read(&net_rwsem);
for_each_net(net)
list_vports_from_net(net, dnet, &head);
up_read(&net_rwsem);
/* Detach all vports from given namespace. */
list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
list_del(&vport->detach_list);
ovs_dp_detach_port(vport);
}
ovs_unlock();
cancel_delayed_work_sync(&ovs_net->masks_rebalance);
cancel_work_sync(&ovs_net->dp_notify_work);
}
static struct pernet_operations ovs_net_ops = {
.init = ovs_init_net,
.exit = ovs_exit_net,
.id = &ovs_net_id,
.size = sizeof(struct ovs_net),
};
static int __init dp_init(void)
{
int err;
BUILD_BUG_ON(sizeof(struct ovs_skb_cb) >
sizeof_field(struct sk_buff, cb));
pr_info("Open vSwitch switching datapath\n");
err = action_fifos_init();
if (err)
goto error;
err = ovs_internal_dev_rtnl_link_register();
if (err)
goto error_action_fifos_exit;
err = ovs_flow_init();
if (err)
goto error_unreg_rtnl_link;
err = ovs_vport_init();
if (err)
goto error_flow_exit;
err = register_pernet_device(&ovs_net_ops);
if (err)
goto error_vport_exit;
err = register_netdevice_notifier(&ovs_dp_device_notifier);
if (err)
goto error_netns_exit;
err = ovs_netdev_init();
if (err)
goto error_unreg_notifier;
err = dp_register_genl();
if (err < 0)
goto error_unreg_netdev;
return 0;
error_unreg_netdev:
ovs_netdev_exit();
error_unreg_notifier:
unregister_netdevice_notifier(&ovs_dp_device_notifier);
error_netns_exit:
unregister_pernet_device(&ovs_net_ops);
error_vport_exit:
ovs_vport_exit();
error_flow_exit:
ovs_flow_exit();
error_unreg_rtnl_link:
ovs_internal_dev_rtnl_link_unregister();
error_action_fifos_exit:
action_fifos_exit();
error:
return err;
}
static void dp_cleanup(void)
{
dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
ovs_netdev_exit();
unregister_netdevice_notifier(&ovs_dp_device_notifier);
unregister_pernet_device(&ovs_net_ops);
rcu_barrier();
ovs_vport_exit();
ovs_flow_exit();
ovs_internal_dev_rtnl_link_unregister();
action_fifos_exit();
}
module_init(dp_init);
module_exit(dp_cleanup);
MODULE_DESCRIPTION("Open vSwitch switching datapath");
MODULE_LICENSE("GPL");
MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY);
MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY);
MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY);
MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY);
MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY);
MODULE_ALIAS_GENL_FAMILY(OVS_CT_LIMIT_FAMILY);
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