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f7cd0081f525dd1d45fafc68397b5393196e978d
openvswitch/datapath/datapath.c
Ben Pfaff f7cd0081f5 datapath: Convert ODP_EXECUTE to use Netlink framing. 
Signed-off-by: Ben Pfaff <blp@nicira.com>
Acked-by: Jesse Gross <jesse@nicira.com>
2011-01-27 21:08:40 -08:00

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/*
* Copyright (c) 2007, 2008, 2009, 2010, 2011 Nicira Networks.
* Distributed under the terms of the GNU GPL version 2.
*
* Significant portions of this file may be copied from parts of the Linux
* kernel, by Linus Torvalds and others.
*/
/* Functions for managing the dp interface/device. */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/init.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/if_arp.h>
#include <linux/if_vlan.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/delay.h>
#include <linux/time.h>
#include <linux/etherdevice.h>
#include <linux/kernel.h>
#include <linux/kthread.h>
#include <linux/mutex.h>
#include <linux/percpu.h>
#include <linux/rcupdate.h>
#include <linux/tcp.h>
#include <linux/udp.h>
#include <linux/version.h>
#include <linux/ethtool.h>
#include <linux/wait.h>
#include <asm/system.h>
#include <asm/div64.h>
#include <asm/bug.h>
#include <linux/highmem.h>
#include <linux/netfilter_bridge.h>
#include <linux/netfilter_ipv4.h>
#include <linux/inetdevice.h>
#include <linux/list.h>
#include <linux/rculist.h>
#include <linux/dmi.h>
#include <net/inet_ecn.h>
#include <net/genetlink.h>
#include <linux/compat.h>
#include "openvswitch/datapath-protocol.h"
#include "checksum.h"
#include "datapath.h"
#include "actions.h"
#include "flow.h"
#include "loop_counter.h"
#include "table.h"
#include "vport-internal_dev.h"
int (*dp_ioctl_hook)(struct net_device *dev, struct ifreq *rq, int cmd);
EXPORT_SYMBOL(dp_ioctl_hook);
/* Datapaths. Protected on the read side by rcu_read_lock, on the write side
* by dp_mutex.
*
* dp_mutex nests inside the RTNL lock: if you need both you must take the RTNL
* lock first.
*
* It is safe to access the datapath and vport structures with just
* dp_mutex.
*/
static struct datapath __rcu *dps[256];
static DEFINE_MUTEX(dp_mutex);
static struct vport *new_vport(const struct vport_parms *);
/* Must be called with rcu_read_lock or dp_mutex. */
struct datapath *get_dp(int dp_idx)
{
if (dp_idx < 0 || dp_idx >= ARRAY_SIZE(dps))
return NULL;
return rcu_dereference_check(dps[dp_idx], rcu_read_lock_held() ||
lockdep_is_held(&dp_mutex));
}
EXPORT_SYMBOL_GPL(get_dp);
static struct datapath *get_dp_locked(int dp_idx)
{
struct datapath *dp;
mutex_lock(&dp_mutex);
dp = get_dp(dp_idx);
if (dp)
mutex_lock(&dp->mutex);
mutex_unlock(&dp_mutex);
return dp;
}
static struct tbl *get_table_protected(struct datapath *dp)
{
return rcu_dereference_protected(dp->table,
lockdep_is_held(&dp->mutex));
}
static struct vport *get_vport_protected(struct datapath *dp, u16 port_no)
{
return rcu_dereference_protected(dp->ports[port_no],
lockdep_is_held(&dp->mutex));
}
/* Must be called with rcu_read_lock or RTNL lock. */
const char *dp_name(const struct datapath *dp)
{
return vport_get_name(rcu_dereference_rtnl(dp->ports[ODPP_LOCAL]));
}
static inline size_t br_nlmsg_size(void)
{
return NLMSG_ALIGN(sizeof(struct ifinfomsg))
+ nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
+ nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
+ nla_total_size(4) /* IFLA_MASTER */
+ nla_total_size(4) /* IFLA_MTU */
+ nla_total_size(4) /* IFLA_LINK */
+ nla_total_size(1); /* IFLA_OPERSTATE */
}
static int dp_fill_ifinfo(struct sk_buff *skb,
const struct vport *port,
int event, unsigned int flags)
{
struct datapath *dp = port->dp;
int ifindex = vport_get_ifindex(port);
int iflink = vport_get_iflink(port);
struct ifinfomsg *hdr;
struct nlmsghdr *nlh;
if (ifindex < 0)
return ifindex;
if (iflink < 0)
return iflink;
nlh = nlmsg_put(skb, 0, 0, event, sizeof(*hdr), flags);
if (nlh == NULL)
return -EMSGSIZE;
hdr = nlmsg_data(nlh);
hdr->ifi_family = AF_BRIDGE;
hdr->__ifi_pad = 0;
hdr->ifi_type = ARPHRD_ETHER;
hdr->ifi_index = ifindex;
hdr->ifi_flags = vport_get_flags(port);
hdr->ifi_change = 0;
NLA_PUT_STRING(skb, IFLA_IFNAME, vport_get_name(port));
NLA_PUT_U32(skb, IFLA_MASTER,
vport_get_ifindex(get_vport_protected(dp, ODPP_LOCAL)));
NLA_PUT_U32(skb, IFLA_MTU, vport_get_mtu(port));
#ifdef IFLA_OPERSTATE
NLA_PUT_U8(skb, IFLA_OPERSTATE,
vport_is_running(port)
? vport_get_operstate(port)
: IF_OPER_DOWN);
#endif
NLA_PUT(skb, IFLA_ADDRESS, ETH_ALEN, vport_get_addr(port));
if (ifindex != iflink)
NLA_PUT_U32(skb, IFLA_LINK,iflink);
return nlmsg_end(skb, nlh);
nla_put_failure:
nlmsg_cancel(skb, nlh);
return -EMSGSIZE;
}
static void dp_ifinfo_notify(int event, struct vport *port)
{
struct sk_buff *skb;
int err = -ENOBUFS;
skb = nlmsg_new(br_nlmsg_size(), GFP_KERNEL);
if (skb == NULL)
goto errout;
err = dp_fill_ifinfo(skb, port, event, 0);
if (err < 0) {
/* -EMSGSIZE implies BUG in br_nlmsg_size() */
WARN_ON(err == -EMSGSIZE);
kfree_skb(skb);
goto errout;
}
rtnl_notify(skb, &init_net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
return;
errout:
if (err < 0)
rtnl_set_sk_err(&init_net, RTNLGRP_LINK, err);
}
static void release_dp(struct kobject *kobj)
{
struct datapath *dp = container_of(kobj, struct datapath, ifobj);
kfree(dp);
}
static struct kobj_type dp_ktype = {
.release = release_dp
};
static void destroy_dp_rcu(struct rcu_head *rcu)
{
struct datapath *dp = container_of(rcu, struct datapath, rcu);
int i;
for (i = 0; i < DP_N_QUEUES; i++)
skb_queue_purge(&dp->queues[i]);
tbl_destroy((struct tbl __force *)dp->table, flow_free_tbl);
free_percpu(dp->stats_percpu);
kobject_put(&dp->ifobj);
}
/* Caller must hold RTNL, dp_mutex, and dp->mutex. */
static void destroy_dp(struct datapath *dp)
{
struct vport *p, *n;
list_for_each_entry_safe (p, n, &dp->port_list, node)
if (p->port_no != ODPP_LOCAL)
dp_detach_port(p);
dp_sysfs_del_dp(dp);
rcu_assign_pointer(dps[dp->dp_idx], NULL);
dp_detach_port(get_vport_protected(dp, ODPP_LOCAL));
mutex_unlock(&dp->mutex);
call_rcu(&dp->rcu, destroy_dp_rcu);
module_put(THIS_MODULE);
}
/* Called with RTNL lock and dp->mutex. */
static struct vport *new_vport(const struct vport_parms *parms)
{
struct vport *vport;
vport_lock();
vport = vport_add(parms);
if (!IS_ERR(vport)) {
struct datapath *dp = parms->dp;
rcu_assign_pointer(dp->ports[parms->port_no], vport);
list_add_rcu(&vport->node, &dp->port_list);
dp_ifinfo_notify(RTM_NEWLINK, vport);
}
vport_unlock();
return vport;
}
int dp_detach_port(struct vport *p)
{
int err;
ASSERT_RTNL();
if (p->port_no != ODPP_LOCAL)
dp_sysfs_del_if(p);
dp_ifinfo_notify(RTM_DELLINK, p);
/* First drop references to device. */
list_del_rcu(&p->node);
rcu_assign_pointer(p->dp->ports[p->port_no], NULL);
/* Then destroy it. */
vport_lock();
err = vport_del(p);
vport_unlock();
return err;
}
/* Must be called with rcu_read_lock. */
void dp_process_received_packet(struct vport *p, struct sk_buff *skb)
{
struct datapath *dp = p->dp;
struct dp_stats_percpu *stats;
int stats_counter_off;
struct sw_flow_actions *acts;
struct loop_counter *loop;
int error;
OVS_CB(skb)->vport = p;
if (!OVS_CB(skb)->flow) {
struct sw_flow_key key;
struct tbl_node *flow_node;
bool is_frag;
/* Extract flow from 'skb' into 'key'. */
error = flow_extract(skb, p ? p->port_no : ODPP_NONE, &key, &is_frag);
if (unlikely(error)) {
kfree_skb(skb);
return;
}
if (is_frag && dp->drop_frags) {
kfree_skb(skb);
stats_counter_off = offsetof(struct dp_stats_percpu, n_frags);
goto out;
}
/* Look up flow. */
flow_node = tbl_lookup(rcu_dereference(dp->table), &key,
flow_hash(&key), flow_cmp);
if (unlikely(!flow_node)) {
struct dp_upcall_info upcall;
upcall.type = _ODPL_MISS_NR;
upcall.key = &key;
upcall.userdata = 0;
upcall.sample_pool = 0;
upcall.actions = NULL;
upcall.actions_len = 0;
dp_upcall(dp, skb, &upcall);
stats_counter_off = offsetof(struct dp_stats_percpu, n_missed);
goto out;
}
OVS_CB(skb)->flow = flow_cast(flow_node);
}
stats_counter_off = offsetof(struct dp_stats_percpu, n_hit);
flow_used(OVS_CB(skb)->flow, skb);
acts = rcu_dereference(OVS_CB(skb)->flow->sf_acts);
/* Check whether we've looped too much. */
loop = loop_get_counter();
if (unlikely(++loop->count > MAX_LOOPS))
loop->looping = true;
if (unlikely(loop->looping)) {
loop_suppress(dp, acts);
kfree_skb(skb);
goto out_loop;
}
/* Execute actions. */
execute_actions(dp, skb, &OVS_CB(skb)->flow->key, acts->actions,
acts->actions_len);
/* Check whether sub-actions looped too much. */
if (unlikely(loop->looping))
loop_suppress(dp, acts);
out_loop:
/* Decrement loop counter. */
if (!--loop->count)
loop->looping = false;
loop_put_counter();
out:
/* Update datapath statistics. */
local_bh_disable();
stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
write_seqcount_begin(&stats->seqlock);
(*(u64 *)((u8 *)stats + stats_counter_off))++;
write_seqcount_end(&stats->seqlock);
local_bh_enable();
}
static void copy_and_csum_skb(struct sk_buff *skb, void *to)
{
u16 csum_start, csum_offset;
__wsum csum;
get_skb_csum_pointers(skb, &csum_start, &csum_offset);
csum_start -= skb_headroom(skb);
BUG_ON(csum_start >= skb_headlen(skb));
skb_copy_bits(skb, 0, to, csum_start);
csum = skb_copy_and_csum_bits(skb, csum_start, to + csum_start,
skb->len - csum_start, 0);
*(__sum16 *)(to + csum_start + csum_offset) = csum_fold(csum);
}
/* Append each packet in 'skb' list to 'queue'. There will be only one packet
* unless we broke up a GSO packet. */
static int queue_control_packets(struct datapath *dp, struct sk_buff *skb,
const struct dp_upcall_info *upcall_info)
{
struct sk_buff *nskb;
int port_no;
int err;
if (OVS_CB(skb)->vport)
port_no = OVS_CB(skb)->vport->port_no;
else
port_no = ODPP_LOCAL;
do {
struct odp_packet *upcall;
struct sk_buff *user_skb; /* to be queued to userspace */
struct nlattr *nla;
unsigned int len;
nskb = skb->next;
skb->next = NULL;
len = sizeof(struct odp_packet);
len += nla_total_size(4); /* ODP_PACKET_ATTR_TYPE. */
len += nla_total_size(skb->len);
len += nla_total_size(FLOW_BUFSIZE);
if (upcall_info->userdata)
len += nla_total_size(8);
if (upcall_info->sample_pool)
len += nla_total_size(4);
if (upcall_info->actions_len)
len += nla_total_size(upcall_info->actions_len);
user_skb = alloc_skb(len, GFP_ATOMIC);
if (!user_skb)
goto err_kfree_skbs;
upcall = (struct odp_packet *)__skb_put(user_skb, sizeof(*upcall));
upcall->dp_idx = dp->dp_idx;
nla_put_u32(user_skb, ODP_PACKET_ATTR_TYPE, upcall_info->type);
nla = nla_nest_start(user_skb, ODP_PACKET_ATTR_KEY);
flow_to_nlattrs(upcall_info->key, user_skb);
nla_nest_end(user_skb, nla);
if (upcall_info->userdata)
nla_put_u64(user_skb, ODP_PACKET_ATTR_USERDATA, upcall_info->userdata);
if (upcall_info->sample_pool)
nla_put_u32(user_skb, ODP_PACKET_ATTR_SAMPLE_POOL, upcall_info->sample_pool);
if (upcall_info->actions_len) {
const struct nlattr *actions = upcall_info->actions;
u32 actions_len = upcall_info->actions_len;
nla = nla_nest_start(user_skb, ODP_PACKET_ATTR_ACTIONS);
memcpy(__skb_put(user_skb, actions_len), actions, actions_len);
nla_nest_end(user_skb, nla);
}
nla = __nla_reserve(user_skb, ODP_PACKET_ATTR_PACKET, skb->len);
if (skb->ip_summed == CHECKSUM_PARTIAL)
copy_and_csum_skb(skb, nla_data(nla));
else
skb_copy_bits(skb, 0, nla_data(nla), skb->len);
upcall->len = user_skb->len;
skb_queue_tail(&dp->queues[upcall_info->type], user_skb);
kfree_skb(skb);
skb = nskb;
} while (skb);
return 0;
err_kfree_skbs:
kfree_skb(skb);
while ((skb = nskb) != NULL) {
nskb = skb->next;
kfree_skb(skb);
}
return err;
}
int dp_upcall(struct datapath *dp, struct sk_buff *skb, const struct dp_upcall_info *upcall_info)
{
struct dp_stats_percpu *stats;
struct sk_buff_head *queue;
int err;
WARN_ON_ONCE(skb_shared(skb));
BUG_ON(upcall_info->type >= DP_N_QUEUES);
queue = &dp->queues[upcall_info->type];
err = -ENOBUFS;
if (skb_queue_len(queue) >= DP_MAX_QUEUE_LEN)
goto err_kfree_skb;
forward_ip_summed(skb);
err = vswitch_skb_checksum_setup(skb);
if (err)
goto err_kfree_skb;
/* Break apart GSO packets into their component pieces. Otherwise
* userspace may try to stuff a 64kB packet into a 1500-byte MTU. */
if (skb_is_gso(skb)) {
struct sk_buff *nskb = skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM);
kfree_skb(skb);
skb = nskb;
if (IS_ERR(skb)) {
err = PTR_ERR(skb);
goto err;
}
}
err = queue_control_packets(dp, skb, upcall_info);
wake_up_interruptible(&dp->waitqueue);
return err;
err_kfree_skb:
kfree_skb(skb);
err:
local_bh_disable();
stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
write_seqcount_begin(&stats->seqlock);
stats->n_lost++;
write_seqcount_end(&stats->seqlock);
local_bh_enable();
return err;
}
static int flush_flows(int dp_idx)
{
struct tbl *old_table;
struct tbl *new_table;
struct datapath *dp;
int err;
dp = get_dp_locked(dp_idx);
err = -ENODEV;
if (!dp)
goto exit;
old_table = get_table_protected(dp);
new_table = tbl_create(TBL_MIN_BUCKETS);
err = -ENOMEM;
if (!new_table)
goto exit_unlock;
rcu_assign_pointer(dp->table, new_table);
tbl_deferred_destroy(old_table, flow_free_tbl);
err = 0;
exit_unlock:
mutex_unlock(&dp->mutex);
exit:
return err;
}
static int validate_actions(const struct nlattr *actions, u32 actions_len)
{
const struct nlattr *a;
int rem;
nla_for_each_attr(a, actions, actions_len, rem) {
static const u32 action_lens[ODPAT_MAX + 1] = {
[ODPAT_OUTPUT] = 4,
[ODPAT_CONTROLLER] = 8,
[ODPAT_SET_DL_TCI] = 2,
[ODPAT_STRIP_VLAN] = 0,
[ODPAT_SET_DL_SRC] = ETH_ALEN,
[ODPAT_SET_DL_DST] = ETH_ALEN,
[ODPAT_SET_NW_SRC] = 4,
[ODPAT_SET_NW_DST] = 4,
[ODPAT_SET_NW_TOS] = 1,
[ODPAT_SET_TP_SRC] = 2,
[ODPAT_SET_TP_DST] = 2,
[ODPAT_SET_TUNNEL] = 8,
[ODPAT_SET_PRIORITY] = 4,
[ODPAT_POP_PRIORITY] = 0,
[ODPAT_DROP_SPOOFED_ARP] = 0,
};
int type = nla_type(a);
if (type > ODPAT_MAX || nla_len(a) != action_lens[type])
return -EINVAL;
switch (type) {
case ODPAT_UNSPEC:
return -EINVAL;
case ODPAT_CONTROLLER:
case ODPAT_STRIP_VLAN:
case ODPAT_SET_DL_SRC:
case ODPAT_SET_DL_DST:
case ODPAT_SET_NW_SRC:
case ODPAT_SET_NW_DST:
case ODPAT_SET_TP_SRC:
case ODPAT_SET_TP_DST:
case ODPAT_SET_TUNNEL:
case ODPAT_SET_PRIORITY:
case ODPAT_POP_PRIORITY:
case ODPAT_DROP_SPOOFED_ARP:
/* No validation needed. */
break;
case ODPAT_OUTPUT:
if (nla_get_u32(a) >= DP_MAX_PORTS)
return -EINVAL;
break;
case ODPAT_SET_DL_TCI:
if (nla_get_be16(a) & htons(VLAN_CFI_MASK))
return -EINVAL;
break;
case ODPAT_SET_NW_TOS:
if (nla_get_u8(a) & INET_ECN_MASK)
return -EINVAL;
break;
default:
return -EOPNOTSUPP;
}
}
if (rem > 0)
return -EINVAL;
return 0;
}
struct dp_flowcmd {
u32 nlmsg_flags;
u32 dp_idx;
u32 total_len;
struct sw_flow_key key;
const struct nlattr *actions;
u32 actions_len;
bool clear;
u64 state;
};
static struct sw_flow_actions *get_actions(const struct dp_flowcmd *flowcmd)
{
struct sw_flow_actions *actions;
actions = flow_actions_alloc(flowcmd->actions_len);
if (!IS_ERR(actions) && flowcmd->actions_len)
memcpy(actions->actions, flowcmd->actions, flowcmd->actions_len);
return actions;
}
static void clear_stats(struct sw_flow *flow)
{
flow->used = 0;
flow->tcp_flags = 0;
flow->packet_count = 0;
flow->byte_count = 0;
}
static int expand_table(struct datapath *dp)
{
struct tbl *old_table = get_table_protected(dp);
struct tbl *new_table;
new_table = tbl_expand(old_table);
if (IS_ERR(new_table))
return PTR_ERR(new_table);
rcu_assign_pointer(dp->table, new_table);
tbl_deferred_destroy(old_table, NULL);
return 0;
}
static const struct nla_policy execute_policy[ODP_PACKET_ATTR_MAX + 1] = {
[ODP_PACKET_ATTR_PACKET] = { .type = NLA_UNSPEC },
[ODP_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
};
static int execute_packet(const struct odp_upcall __user *uodp_upcall)
{
struct nlattr *a[ODP_PACKET_ATTR_MAX + 1];
struct odp_upcall *odp_upcall;
struct sk_buff *skb, *packet;
unsigned int actions_len;
struct nlattr *actions;
struct sw_flow_key key;
struct datapath *dp;
struct ethhdr *eth;
bool is_frag;
u32 len;
int err;
if (get_user(len, &uodp_upcall->len))
return -EFAULT;
if (len < sizeof(struct odp_upcall))
return -EINVAL;
skb = alloc_skb(len, GFP_KERNEL);
if (!skb)
return -ENOMEM;
err = -EFAULT;
if (copy_from_user(__skb_put(skb, len), uodp_upcall, len))
goto exit_free_skb;
odp_upcall = (struct odp_upcall *)skb->data;
err = -EINVAL;
if (odp_upcall->len != len)
goto exit_free_skb;
__skb_pull(skb, sizeof(struct odp_upcall));
err = nla_parse(a, ODP_PACKET_ATTR_MAX, (struct nlattr *)skb->data,
skb->len, execute_policy);
if (err)
goto exit_free_skb;
err = -EINVAL;
if (!a[ODP_PACKET_ATTR_PACKET] || !a[ODP_PACKET_ATTR_ACTIONS] ||
nla_len(a[ODP_PACKET_ATTR_PACKET]) < ETH_HLEN)
goto exit_free_skb;
actions = nla_data(a[ODP_PACKET_ATTR_ACTIONS]);
actions_len = nla_len(a[ODP_PACKET_ATTR_ACTIONS]);
err = validate_actions(actions, actions_len);
if (err)
goto exit_free_skb;
packet = skb_clone(skb, GFP_KERNEL);
err = -ENOMEM;
if (!packet)
goto exit_free_skb;
packet->data = nla_data(a[ODP_PACKET_ATTR_PACKET]);
packet->len = nla_len(a[ODP_PACKET_ATTR_PACKET]);
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);
err = flow_extract(packet, -1, &key, &is_frag);
if (err)
goto exit_free_skb;
rcu_read_lock();
dp = get_dp(odp_upcall->dp_idx);
err = -ENODEV;
if (dp)
err = execute_actions(dp, packet, &key, actions, actions_len);
rcu_read_unlock();
exit_free_skb:
kfree_skb(skb);
return err;
}
static void get_dp_stats(struct datapath *dp, struct odp_stats *stats)
{
int i;
stats->n_frags = stats->n_hit = stats->n_missed = stats->n_lost = 0;
for_each_possible_cpu(i) {
const struct dp_stats_percpu *percpu_stats;
struct dp_stats_percpu local_stats;
unsigned seqcount;
percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
do {
seqcount = read_seqcount_begin(&percpu_stats->seqlock);
local_stats = *percpu_stats;
} while (read_seqcount_retry(&percpu_stats->seqlock, seqcount));
stats->n_frags += local_stats.n_frags;
stats->n_hit += local_stats.n_hit;
stats->n_missed += local_stats.n_missed;
stats->n_lost += local_stats.n_lost;
}
}
/* MTU of the dp pseudo-device: ETH_DATA_LEN or the minimum of the ports */
int dp_min_mtu(const struct datapath *dp)
{
struct vport *p;
int mtu = 0;
ASSERT_RTNL();
list_for_each_entry_rcu (p, &dp->port_list, node) {
int dev_mtu;
/* Skip any internal ports, since that's what we're trying to
* set. */
if (is_internal_vport(p))
continue;
dev_mtu = vport_get_mtu(p);
if (!mtu || dev_mtu < mtu)
mtu = dev_mtu;
}
return mtu ? mtu : ETH_DATA_LEN;
}
/* Sets the MTU of all datapath devices to the minimum of the ports. Must
* be called with RTNL lock. */
void set_internal_devs_mtu(const struct datapath *dp)
{
struct vport *p;
int mtu;
ASSERT_RTNL();
mtu = dp_min_mtu(dp);
list_for_each_entry_rcu (p, &dp->port_list, node) {
if (is_internal_vport(p))
vport_set_mtu(p, mtu);
}
}
static int get_listen_mask(const struct file *f)
{
return (long)f->private_data;
}
static void set_listen_mask(struct file *f, int listen_mask)
{
f->private_data = (void*)(long)listen_mask;
}
static const struct nla_policy flow_policy[ODP_FLOW_ATTR_MAX + 1] = {
[ODP_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
[ODP_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
[ODP_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
[ODP_FLOW_ATTR_STATE] = { .type = NLA_U64 },
};
static int copy_flow_to_user(struct odp_flow __user *dst, struct datapath *dp,
struct sw_flow *flow, u32 total_len, u64 state)
{
const struct sw_flow_actions *sf_acts;
struct odp_flow_stats stats;
struct odp_flow *odp_flow;
struct sk_buff *skb;
struct nlattr *nla;
unsigned long used;
u8 tcp_flags;
int err;
sf_acts = rcu_dereference_protected(flow->sf_acts,
lockdep_is_held(&dp->mutex));
skb = alloc_skb(128 + FLOW_BUFSIZE + sf_acts->actions_len, GFP_KERNEL);
err = -ENOMEM;
if (!skb)
goto exit;
rcu_read_lock();
odp_flow = (struct odp_flow*)__skb_put(skb, sizeof(struct odp_flow));
odp_flow->dp_idx = dp->dp_idx;
odp_flow->total_len = total_len;
nla = nla_nest_start(skb, ODP_FLOW_ATTR_KEY);
if (!nla)
goto nla_put_failure;
err = flow_to_nlattrs(&flow->key, skb);
if (err)
goto exit_unlock;
nla_nest_end(skb, nla);
nla = nla_nest_start(skb, ODP_FLOW_ATTR_ACTIONS);
if (!nla || skb_tailroom(skb) < sf_acts->actions_len)
goto nla_put_failure;
memcpy(__skb_put(skb, sf_acts->actions_len), sf_acts->actions, sf_acts->actions_len);
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_MSECS(skb, ODP_FLOW_ATTR_USED, used);
if (stats.n_packets)
NLA_PUT(skb, ODP_FLOW_ATTR_STATS, sizeof(struct odp_flow_stats), &stats);
if (tcp_flags)
NLA_PUT_U8(skb, ODP_FLOW_ATTR_TCP_FLAGS, tcp_flags);
if (state)
NLA_PUT_U64(skb, ODP_FLOW_ATTR_STATE, state);
if (skb->len > total_len)
goto nla_put_failure;
odp_flow->len = skb->len;
err = copy_to_user(dst, skb->data, skb->len) ? -EFAULT : 0;
goto exit_unlock;
nla_put_failure:
err = -EMSGSIZE;
exit_unlock:
rcu_read_unlock();
kfree_skb(skb);
exit:
return err;
}
static struct sk_buff *copy_flow_from_user(struct odp_flow __user *uodp_flow,
struct dp_flowcmd *flowcmd)
{
struct nlattr *a[ODP_FLOW_ATTR_MAX + 1];
struct odp_flow *odp_flow;
struct sk_buff *skb;
u32 len;
int err;
if (get_user(len, &uodp_flow->len))
return ERR_PTR(-EFAULT);
if (len < sizeof(struct odp_flow))
return ERR_PTR(-EINVAL);
skb = alloc_skb(len, GFP_KERNEL);
if (!skb)
return ERR_PTR(-ENOMEM);
err = -EFAULT;
if (copy_from_user(__skb_put(skb, len), uodp_flow, len))
goto error_free_skb;
odp_flow = (struct odp_flow *)skb->data;
err = -EINVAL;
if (odp_flow->len != len)
goto error_free_skb;
flowcmd->nlmsg_flags = odp_flow->nlmsg_flags;
flowcmd->dp_idx = odp_flow->dp_idx;
flowcmd->total_len = odp_flow->total_len;
err = nla_parse(a, ODP_FLOW_ATTR_MAX,
(struct nlattr *)(skb->data + sizeof(struct odp_flow)),
skb->len - sizeof(struct odp_flow), flow_policy);
if (err)
goto error_free_skb;
/* ODP_FLOW_ATTR_KEY. */
if (a[ODP_FLOW_ATTR_KEY]) {
err = flow_from_nlattrs(&flowcmd->key, a[ODP_FLOW_ATTR_KEY]);
if (err)
goto error_free_skb;
} else
memset(&flowcmd->key, 0, sizeof(struct sw_flow_key));
/* ODP_FLOW_ATTR_ACTIONS. */
if (a[ODP_FLOW_ATTR_ACTIONS]) {
flowcmd->actions = nla_data(a[ODP_FLOW_ATTR_ACTIONS]);
flowcmd->actions_len = nla_len(a[ODP_FLOW_ATTR_ACTIONS]);
err = validate_actions(flowcmd->actions, flowcmd->actions_len);
if (err)
goto error_free_skb;
} else {
flowcmd->actions = NULL;
flowcmd->actions_len = 0;
}
flowcmd->clear = a[ODP_FLOW_ATTR_CLEAR] != NULL;
flowcmd->state = a[ODP_FLOW_ATTR_STATE] ? nla_get_u64(a[ODP_FLOW_ATTR_STATE]) : 0;
return skb;
error_free_skb:
kfree_skb(skb);
return ERR_PTR(err);
}
static int new_flow(unsigned int cmd, struct odp_flow __user *uodp_flow)
{
struct tbl_node *flow_node;
struct dp_flowcmd flowcmd;
struct sw_flow *flow;
struct sk_buff *skb;
struct datapath *dp;
struct tbl *table;
u32 hash;
int error;
skb = copy_flow_from_user(uodp_flow, &flowcmd);
error = PTR_ERR(skb);
if (IS_ERR(skb))
goto exit;
dp = get_dp_locked(flowcmd.dp_idx);
error = -ENODEV;
if (!dp)
goto error_kfree_skb;
hash = flow_hash(&flowcmd.key);
table = get_table_protected(dp);
flow_node = tbl_lookup(table, &flowcmd.key, hash, flow_cmp);
if (!flow_node) {
struct sw_flow_actions *acts;
/* Bail out if we're not allowed to create a new flow. */
error = -ENOENT;
if (cmd == ODP_FLOW_SET)
goto error_unlock_dp;
/* Expand table, if necessary, to make room. */
if (tbl_count(table) >= tbl_n_buckets(table)) {
error = expand_table(dp);
if (error)
goto error_unlock_dp;
table = get_table_protected(dp);
}
/* Allocate flow. */
flow = flow_alloc();
if (IS_ERR(flow)) {
error = PTR_ERR(flow);
goto error_unlock_dp;
}
flow->key = flowcmd.key;
clear_stats(flow);
/* Obtain actions. */
acts = get_actions(&flowcmd);
error = PTR_ERR(acts);
if (IS_ERR(acts))
goto error_free_flow;
rcu_assign_pointer(flow->sf_acts, acts);
error = copy_flow_to_user(uodp_flow, dp, flow, flowcmd.total_len, 0);
if (error)
goto error_free_flow;
/* Put flow in bucket. */
error = tbl_insert(table, &flow->tbl_node, hash);
if (error)
goto error_free_flow;
} else {
/* We found a matching flow. */
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.
*/
error = -EEXIST;
if (flowcmd.nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
goto error_kfree_skb;
/* Update actions. */
flow = flow_cast(flow_node);
old_acts = rcu_dereference_protected(flow->sf_acts,
lockdep_is_held(&dp->mutex));
if (flowcmd.actions &&
(old_acts->actions_len != flowcmd.actions_len ||
memcmp(old_acts->actions, flowcmd.actions,
flowcmd.actions_len))) {
struct sw_flow_actions *new_acts;
new_acts = get_actions(&flowcmd);
error = PTR_ERR(new_acts);
if (IS_ERR(new_acts))
goto error_kfree_skb;
rcu_assign_pointer(flow->sf_acts, new_acts);
flow_deferred_free_acts(old_acts);
}
error = copy_flow_to_user(uodp_flow, dp, flow, flowcmd.total_len, 0);
if (error)
goto error_kfree_skb;
/* Clear stats. */
if (flowcmd.clear) {
spin_lock_bh(&flow->lock);
clear_stats(flow);
spin_unlock_bh(&flow->lock);
}
}
kfree_skb(skb);
mutex_unlock(&dp->mutex);
return 0;
error_free_flow:
flow_put(flow);
error_unlock_dp:
mutex_unlock(&dp->mutex);
error_kfree_skb:
kfree_skb(skb);
exit:
return error;
}
static int get_or_del_flow(unsigned int cmd, struct odp_flow __user *uodp_flow)
{
struct tbl_node *flow_node;
struct dp_flowcmd flowcmd;
struct sw_flow *flow;
struct sk_buff *skb;
struct datapath *dp;
struct tbl *table;
int err;
skb = copy_flow_from_user(uodp_flow, &flowcmd);
err = PTR_ERR(skb);
if (IS_ERR(skb))
goto exit;
dp = get_dp_locked(flowcmd.dp_idx);
err = -ENODEV;
if (!dp)
goto exit_kfree_skb;
table = get_table_protected(dp);
flow_node = tbl_lookup(table, &flowcmd.key, flow_hash(&flowcmd.key), flow_cmp);
err = -ENOENT;
if (!flow_node)
goto exit_unlock_dp;
if (cmd == ODP_FLOW_DEL) {
err = tbl_remove(table, flow_node);
if (err)
goto exit_unlock_dp;
}
flow = flow_cast(flow_node);
err = copy_flow_to_user(uodp_flow, dp, flow, flowcmd.total_len, 0);
if (!err && cmd == ODP_FLOW_DEL)
flow_deferred_free(flow);
exit_unlock_dp:
mutex_unlock(&dp->mutex);
exit_kfree_skb:
kfree_skb(skb);
exit:
return err;
}
static int dump_flow(struct odp_flow __user *uodp_flow)
{
struct tbl_node *flow_node;
struct dp_flowcmd flowcmd;
struct sw_flow *flow;
struct sk_buff *skb;
struct datapath *dp;
u32 bucket, obj;
int err;
skb = copy_flow_from_user(uodp_flow, &flowcmd);
err = PTR_ERR(skb);
if (IS_ERR(skb))
goto exit;
dp = get_dp_locked(flowcmd.dp_idx);
err = -ENODEV;
if (!dp)
goto exit_free;
bucket = flowcmd.state >> 32;
obj = flowcmd.state;
flow_node = tbl_next(dp->table, &bucket, &obj);
err = -ENODEV;
if (!flow_node)
goto exit_unlock_dp;
flow = flow_cast(flow_node);
err = copy_flow_to_user(uodp_flow, dp, flow, flowcmd.total_len,
((u64)bucket << 32) | obj);
exit_unlock_dp:
mutex_unlock(&dp->mutex);
exit_free:
kfree_skb(skb);
exit:
return err;
}
static const struct nla_policy datapath_policy[ODP_DP_ATTR_MAX + 1] = {
[ODP_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
[ODP_DP_ATTR_IPV4_FRAGS] = { .type = NLA_U32 },
[ODP_DP_ATTR_SAMPLING] = { .type = NLA_U32 },
};
static int copy_datapath_to_user(void __user *dst, struct datapath *dp, uint32_t total_len)
{
struct odp_datapath *odp_datapath;
struct sk_buff *skb;
struct nlattr *nla;
int err;
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
err = -ENOMEM;
if (!skb)
goto exit;
odp_datapath = (struct odp_datapath*)__skb_put(skb, sizeof(struct odp_datapath));
odp_datapath->dp_idx = dp->dp_idx;
odp_datapath->total_len = total_len;
rcu_read_lock();
err = nla_put_string(skb, ODP_DP_ATTR_NAME, dp_name(dp));
rcu_read_unlock();
if (err)
goto nla_put_failure;
nla = nla_reserve(skb, ODP_DP_ATTR_STATS, sizeof(struct odp_stats));
if (!nla)
goto nla_put_failure;
get_dp_stats(dp, nla_data(nla));
NLA_PUT_U32(skb, ODP_DP_ATTR_IPV4_FRAGS,
dp->drop_frags ? ODP_DP_FRAG_DROP : ODP_DP_FRAG_ZERO);
if (dp->sflow_probability)
NLA_PUT_U32(skb, ODP_DP_ATTR_SAMPLING, dp->sflow_probability);
if (skb->len > total_len)
goto nla_put_failure;
odp_datapath->len = skb->len;
err = copy_to_user(dst, skb->data, skb->len) ? -EFAULT : 0;
goto exit_free_skb;
nla_put_failure:
err = -EMSGSIZE;
exit_free_skb:
kfree_skb(skb);
exit:
return err;
}
static struct sk_buff *copy_datapath_from_user(struct odp_datapath __user *uodp_datapath, struct nlattr *a[ODP_DP_ATTR_MAX + 1])
{
struct odp_datapath *odp_datapath;
struct sk_buff *skb;
u32 len;
int err;
if (get_user(len, &uodp_datapath->len))
return ERR_PTR(-EFAULT);
if (len < sizeof(struct odp_datapath))
return ERR_PTR(-EINVAL);
skb = alloc_skb(len, GFP_KERNEL);
if (!skb)
return ERR_PTR(-ENOMEM);
err = -EFAULT;
if (copy_from_user(__skb_put(skb, len), uodp_datapath, len))
goto error_free_skb;
odp_datapath = (struct odp_datapath *)skb->data;
err = -EINVAL;
if (odp_datapath->len != len)
goto error_free_skb;
err = nla_parse(a, ODP_DP_ATTR_MAX,
(struct nlattr *)(skb->data + sizeof(struct odp_datapath)),
skb->len - sizeof(struct odp_datapath), datapath_policy);
if (err)
goto error_free_skb;
if (a[ODP_DP_ATTR_IPV4_FRAGS]) {
u32 frags = nla_get_u32(a[ODP_DP_ATTR_IPV4_FRAGS]);
err = -EINVAL;
if (frags != ODP_DP_FRAG_ZERO && frags != ODP_DP_FRAG_DROP)
goto error_free_skb;
}
err = VERIFY_NUL_STRING(a[ODP_DP_ATTR_NAME], IFNAMSIZ - 1);
if (err)
goto error_free_skb;
return skb;
error_free_skb:
kfree_skb(skb);
return ERR_PTR(err);
}
/* Called with dp_mutex and optionally with RTNL lock also.
* Holds the returned datapath's mutex on return.
*/
static struct datapath *lookup_datapath(struct odp_datapath *odp_datapath, struct nlattr *a[ODP_DP_ATTR_MAX + 1])
{
WARN_ON_ONCE(!mutex_is_locked(&dp_mutex));
if (!a[ODP_DP_ATTR_NAME]) {
struct datapath *dp;
dp = get_dp(odp_datapath->dp_idx);
if (!dp)
return ERR_PTR(-ENODEV);
mutex_lock(&dp->mutex);
return dp;
} else {
struct datapath *dp;
struct vport *vport;
int dp_idx;
vport_lock();
vport = vport_locate(nla_data(a[ODP_DP_ATTR_NAME]));
dp_idx = vport && vport->port_no == ODPP_LOCAL ? vport->dp->dp_idx : -1;
vport_unlock();
if (dp_idx < 0)
return ERR_PTR(-ENODEV);
dp = get_dp(dp_idx);
mutex_lock(&dp->mutex);
return dp;
}
}
static void change_datapath(struct datapath *dp, struct nlattr *a[ODP_DP_ATTR_MAX + 1])
{
if (a[ODP_DP_ATTR_IPV4_FRAGS])
dp->drop_frags = nla_get_u32(a[ODP_DP_ATTR_IPV4_FRAGS]) == ODP_DP_FRAG_DROP;
if (a[ODP_DP_ATTR_SAMPLING])
dp->sflow_probability = nla_get_u32(a[ODP_DP_ATTR_SAMPLING]);
}
static int new_datapath(struct odp_datapath __user *uodp_datapath)
{
struct nlattr *a[ODP_DP_ATTR_MAX + 1];
struct odp_datapath *odp_datapath;
struct vport_parms parms;
struct sk_buff *skb;
struct datapath *dp;
struct vport *vport;
int dp_idx;
int err;
int i;
skb = copy_datapath_from_user(uodp_datapath, a);
err = PTR_ERR(skb);
if (IS_ERR(skb))
goto err;
odp_datapath = (struct odp_datapath *)skb->data;
err = -EINVAL;
if (!a[ODP_DP_ATTR_NAME])
goto err_free_skb;
rtnl_lock();
mutex_lock(&dp_mutex);
err = -ENODEV;
if (!try_module_get(THIS_MODULE))
goto err_unlock_dp_mutex;
dp_idx = odp_datapath->dp_idx;
if (dp_idx < 0) {
err = -EFBIG;
for (dp_idx = 0; dp_idx < ARRAY_SIZE(dps); dp_idx++) {
if (get_dp(dp_idx))
continue;
err = 0;
break;
}
} else if (dp_idx < ARRAY_SIZE(dps))
err = get_dp(dp_idx) ? -EBUSY : 0;
else
err = -EINVAL;
if (err)
goto err_put_module;
err = -ENOMEM;
dp = kzalloc(sizeof(*dp), GFP_KERNEL);
if (dp == NULL)
goto err_put_module;
INIT_LIST_HEAD(&dp->port_list);
mutex_init(&dp->mutex);
mutex_lock(&dp->mutex);
dp->dp_idx = dp_idx;
for (i = 0; i < DP_N_QUEUES; i++)
skb_queue_head_init(&dp->queues[i]);
init_waitqueue_head(&dp->waitqueue);
/* Initialize kobject for bridge. This will be added as
* /sys/class/net/<devname>/brif later, if sysfs is enabled. */
dp->ifobj.kset = NULL;
kobject_init(&dp->ifobj, &dp_ktype);
/* Allocate table. */
err = -ENOMEM;
rcu_assign_pointer(dp->table, tbl_create(TBL_MIN_BUCKETS));
if (!dp->table)
goto err_free_dp;
/* Set up our datapath device. */
parms.name = nla_data(a[ODP_DP_ATTR_NAME]);
parms.type = ODP_VPORT_TYPE_INTERNAL;
parms.options = NULL;
parms.dp = dp;
parms.port_no = ODPP_LOCAL;
vport = new_vport(&parms);
if (IS_ERR(vport)) {
err = PTR_ERR(vport);
if (err == -EBUSY)
err = -EEXIST;
goto err_destroy_table;
}
dp->drop_frags = 0;
dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
if (!dp->stats_percpu) {
err = -ENOMEM;
goto err_destroy_local_port;
}
change_datapath(dp, a);
rcu_assign_pointer(dps[dp_idx], dp);
dp_sysfs_add_dp(dp);
mutex_unlock(&dp->mutex);
mutex_unlock(&dp_mutex);
rtnl_unlock();
return 0;
err_destroy_local_port:
dp_detach_port(get_vport_protected(dp, ODPP_LOCAL));
err_destroy_table:
tbl_destroy(get_table_protected(dp), NULL);
err_free_dp:
mutex_unlock(&dp->mutex);
kfree(dp);
err_put_module:
module_put(THIS_MODULE);
err_unlock_dp_mutex:
mutex_unlock(&dp_mutex);
rtnl_unlock();
err_free_skb:
kfree_skb(skb);
err:
return err;
}
static int del_datapath(struct odp_datapath __user *uodp_datapath)
{
struct nlattr *a[ODP_DP_ATTR_MAX + 1];
struct datapath *dp;
struct sk_buff *skb;
int err;
skb = copy_datapath_from_user(uodp_datapath, a);
err = PTR_ERR(skb);
if (IS_ERR(skb))
goto exit;
rtnl_lock();
mutex_lock(&dp_mutex);
dp = lookup_datapath((struct odp_datapath *)skb->data, a);
err = PTR_ERR(dp);
if (IS_ERR(dp))
goto exit_free;
destroy_dp(dp);
err = 0;
exit_free:
kfree_skb(skb);
mutex_unlock(&dp_mutex);
rtnl_unlock();
exit:
return err;
}
static int set_datapath(struct odp_datapath __user *uodp_datapath)
{
struct nlattr *a[ODP_DP_ATTR_MAX + 1];
struct datapath *dp;
struct sk_buff *skb;
int err;
skb = copy_datapath_from_user(uodp_datapath, a);
err = PTR_ERR(skb);
if (IS_ERR(skb))
goto exit;
mutex_lock(&dp_mutex);
dp = lookup_datapath((struct odp_datapath *)skb->data, a);
err = PTR_ERR(dp);
if (IS_ERR(dp))
goto exit_free;
change_datapath(dp, a);
mutex_unlock(&dp->mutex);
err = 0;
exit_free:
kfree_skb(skb);
mutex_unlock(&dp_mutex);
exit:
return err;
}
static int get_datapath(struct odp_datapath __user *uodp_datapath)
{
struct nlattr *a[ODP_DP_ATTR_MAX + 1];
struct odp_datapath *odp_datapath;
struct datapath *dp;
struct sk_buff *skb;
int err;
skb = copy_datapath_from_user(uodp_datapath, a);
err = PTR_ERR(skb);
if (IS_ERR(skb))
goto exit;
odp_datapath = (struct odp_datapath *)skb->data;
mutex_lock(&dp_mutex);
dp = lookup_datapath(odp_datapath, a);
mutex_unlock(&dp_mutex);
err = PTR_ERR(dp);
if (IS_ERR(dp))
goto exit_free;
err = copy_datapath_to_user(uodp_datapath, dp, odp_datapath->total_len);
mutex_unlock(&dp->mutex);
exit_free:
kfree_skb(skb);
exit:
return err;
}
static int dump_datapath(struct odp_datapath __user *uodp_datapath)
{
struct nlattr *a[ODP_DP_ATTR_MAX + 1];
struct odp_datapath *odp_datapath;
struct sk_buff *skb;
u32 dp_idx;
int err;
skb = copy_datapath_from_user(uodp_datapath, a);
err = PTR_ERR(skb);
if (IS_ERR(skb))
goto exit;
odp_datapath = (struct odp_datapath *)skb->data;
mutex_lock(&dp_mutex);
for (dp_idx = odp_datapath->dp_idx; dp_idx < ARRAY_SIZE(dps); dp_idx++) {
struct datapath *dp = get_dp(dp_idx);
if (!dp)
continue;
mutex_lock(&dp->mutex);
mutex_unlock(&dp_mutex);
err = copy_datapath_to_user(uodp_datapath, dp, odp_datapath->total_len);
mutex_unlock(&dp->mutex);
goto exit_free;
}
mutex_unlock(&dp_mutex);
err = -ENODEV;
exit_free:
kfree_skb(skb);
exit:
return err;
}
static const struct nla_policy vport_policy[ODP_VPORT_ATTR_MAX + 1] = {
[ODP_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
[ODP_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
[ODP_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
[ODP_VPORT_ATTR_STATS] = { .len = sizeof(struct rtnl_link_stats64) },
[ODP_VPORT_ATTR_ADDRESS] = { .len = ETH_ALEN },
[ODP_VPORT_ATTR_MTU] = { .type = NLA_U32 },
[ODP_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
};
static int copy_vport_to_user(void __user *dst, struct vport *vport, uint32_t total_len)
{
struct odp_vport *odp_vport;
struct sk_buff *skb;
struct nlattr *nla;
int ifindex, iflink;
int err;
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
err = -ENOMEM;
if (!skb)
goto exit;
rcu_read_lock();
odp_vport = (struct odp_vport*)__skb_put(skb, sizeof(struct odp_vport));
odp_vport->dp_idx = vport->dp->dp_idx;
odp_vport->total_len = total_len;
NLA_PUT_U32(skb, ODP_VPORT_ATTR_PORT_NO, vport->port_no);
NLA_PUT_U32(skb, ODP_VPORT_ATTR_TYPE, vport_get_type(vport));
NLA_PUT_STRING(skb, ODP_VPORT_ATTR_NAME, vport_get_name(vport));
nla = nla_reserve(skb, ODP_VPORT_ATTR_STATS, sizeof(struct rtnl_link_stats64));
if (!nla)
goto nla_put_failure;
if (vport_get_stats(vport, nla_data(nla)))
__skb_trim(skb, skb->len - nla->nla_len);
NLA_PUT(skb, ODP_VPORT_ATTR_ADDRESS, ETH_ALEN, vport_get_addr(vport));
NLA_PUT_U32(skb, ODP_VPORT_ATTR_MTU, vport_get_mtu(vport));
err = vport_get_options(vport, skb);
ifindex = vport_get_ifindex(vport);
if (ifindex > 0)
NLA_PUT_U32(skb, ODP_VPORT_ATTR_IFINDEX, ifindex);
iflink = vport_get_iflink(vport);
if (iflink > 0)
NLA_PUT_U32(skb, ODP_VPORT_ATTR_IFLINK, iflink);
err = -EMSGSIZE;
if (skb->len > total_len)
goto exit_unlock;
odp_vport->len = skb->len;
err = copy_to_user(dst, skb->data, skb->len) ? -EFAULT : 0;
goto exit_unlock;
nla_put_failure:
err = -EMSGSIZE;
exit_unlock:
rcu_read_unlock();
kfree_skb(skb);
exit:
return err;
}
static struct sk_buff *copy_vport_from_user(struct odp_vport __user *uodp_vport,
struct nlattr *a[ODP_VPORT_ATTR_MAX + 1])
{
struct odp_vport *odp_vport;
struct sk_buff *skb;
u32 len;
int err;
if (get_user(len, &uodp_vport->len))
return ERR_PTR(-EFAULT);
if (len < sizeof(struct odp_vport))
return ERR_PTR(-EINVAL);
skb = alloc_skb(len, GFP_KERNEL);
if (!skb)
return ERR_PTR(-ENOMEM);
err = -EFAULT;
if (copy_from_user(__skb_put(skb, len), uodp_vport, len))
goto error_free_skb;
odp_vport = (struct odp_vport *)skb->data;
err = -EINVAL;
if (odp_vport->len != len)
goto error_free_skb;
err = nla_parse(a, ODP_VPORT_ATTR_MAX, (struct nlattr *)(skb->data + sizeof(struct odp_vport)),
skb->len - sizeof(struct odp_vport), vport_policy);
if (err)
goto error_free_skb;
err = VERIFY_NUL_STRING(a[ODP_VPORT_ATTR_NAME], IFNAMSIZ - 1);
if (err)
goto error_free_skb;
return skb;
error_free_skb:
kfree_skb(skb);
return ERR_PTR(err);
}
/* Called without any locks (or with RTNL lock).
* Returns holding vport->dp->mutex.
*/
static struct vport *lookup_vport(struct odp_vport *odp_vport,
struct nlattr *a[ODP_VPORT_ATTR_MAX + 1])
{
struct datapath *dp;
struct vport *vport;
if (a[ODP_VPORT_ATTR_NAME]) {
int dp_idx, port_no;
retry:
vport_lock();
vport = vport_locate(nla_data(a[ODP_VPORT_ATTR_NAME]));
if (!vport) {
vport_unlock();
return ERR_PTR(-ENODEV);
}
dp_idx = vport->dp->dp_idx;
port_no = vport->port_no;
vport_unlock();
dp = get_dp_locked(dp_idx);
if (!dp)
goto retry;
vport = get_vport_protected(dp, port_no);
if (!vport ||
strcmp(vport_get_name(vport), nla_data(a[ODP_VPORT_ATTR_NAME]))) {
mutex_unlock(&dp->mutex);
goto retry;
}
return vport;
} else if (a[ODP_VPORT_ATTR_PORT_NO]) {
u32 port_no = nla_get_u32(a[ODP_VPORT_ATTR_PORT_NO]);
if (port_no >= DP_MAX_PORTS)
return ERR_PTR(-EINVAL);
dp = get_dp_locked(odp_vport->dp_idx);
if (!dp)
return ERR_PTR(-ENODEV);
vport = get_vport_protected(dp, port_no);
if (!vport) {
mutex_unlock(&dp->mutex);
return ERR_PTR(-ENOENT);
}
return vport;
} else
return ERR_PTR(-EINVAL);
}
static int change_vport(struct vport *vport, struct nlattr *a[ODP_VPORT_ATTR_MAX + 1])
{
int err = 0;
if (a[ODP_VPORT_ATTR_STATS])
err = vport_set_stats(vport, nla_data(a[ODP_VPORT_ATTR_STATS]));
if (!err && a[ODP_VPORT_ATTR_ADDRESS])
err = vport_set_addr(vport, nla_data(a[ODP_VPORT_ATTR_ADDRESS]));
if (!err && a[ODP_VPORT_ATTR_MTU])
err = vport_set_mtu(vport, nla_get_u32(a[ODP_VPORT_ATTR_MTU]));
return err;
}
static int attach_vport(struct odp_vport __user *uodp_vport)
{
struct nlattr *a[ODP_VPORT_ATTR_MAX + 1];
struct odp_vport *odp_vport;
struct vport_parms parms;
struct vport *vport;
struct sk_buff *skb;
struct datapath *dp;
u32 port_no;
int err;
skb = copy_vport_from_user(uodp_vport, a);
err = PTR_ERR(skb);
if (IS_ERR(skb))
goto exit;
odp_vport = (struct odp_vport *)skb->data;
err = -EINVAL;
if (!a[ODP_VPORT_ATTR_NAME] || !a[ODP_VPORT_ATTR_TYPE])
goto exit_kfree_skb;
rtnl_lock();
dp = get_dp_locked(odp_vport->dp_idx);
err = -ENODEV;
if (!dp)
goto exit_unlock_rtnl;
if (a[ODP_VPORT_ATTR_PORT_NO]) {
port_no = nla_get_u32(a[ODP_VPORT_ATTR_PORT_NO]);
err = -EFBIG;
if (port_no >= DP_MAX_PORTS)
goto exit_unlock_dp;
vport = get_vport_protected(dp, port_no);
err = -EBUSY;
if (vport)
goto exit_unlock_dp;
} else {
for (port_no = 1; ; port_no++) {
if (port_no >= DP_MAX_PORTS) {
err = -EFBIG;
goto exit_unlock_dp;
}
vport = get_vport_protected(dp, port_no);
if (!vport)
break;
}
}
parms.name = nla_data(a[ODP_VPORT_ATTR_NAME]);
parms.type = nla_get_u32(a[ODP_VPORT_ATTR_TYPE]);
parms.options = a[ODP_VPORT_ATTR_OPTIONS];
parms.dp = dp;
parms.port_no = port_no;
vport = new_vport(&parms);
err = PTR_ERR(vport);
if (IS_ERR(vport))
goto exit_unlock_dp;
set_internal_devs_mtu(dp);
dp_sysfs_add_if(vport);
err = change_vport(vport, a);
if (err) {
dp_detach_port(vport);
goto exit_unlock_dp;
}
err = copy_vport_to_user(uodp_vport, vport, odp_vport->total_len);
exit_unlock_dp:
mutex_unlock(&dp->mutex);
exit_unlock_rtnl:
rtnl_unlock();
exit_kfree_skb:
kfree_skb(skb);
exit:
return err;
}
static int set_vport(unsigned int cmd, struct odp_vport __user *uodp_vport)
{
struct nlattr *a[ODP_VPORT_ATTR_MAX + 1];
struct vport *vport;
struct sk_buff *skb;
int err;
skb = copy_vport_from_user(uodp_vport, a);
err = PTR_ERR(skb);
if (IS_ERR(skb))
goto exit;
rtnl_lock();
vport = lookup_vport((struct odp_vport *)skb->data, a);
err = PTR_ERR(vport);
if (IS_ERR(vport))
goto exit_free;
err = 0;
if (a[ODP_VPORT_ATTR_OPTIONS])
err = vport_set_options(vport, a[ODP_VPORT_ATTR_OPTIONS]);
if (!err)
err = change_vport(vport, a);
mutex_unlock(&vport->dp->mutex);
exit_free:
kfree_skb(skb);
rtnl_unlock();
exit:
return err;
}
static int del_vport(unsigned int cmd, struct odp_vport __user *uodp_vport)
{
struct nlattr *a[ODP_VPORT_ATTR_MAX + 1];
struct datapath *dp;
struct vport *vport;
struct sk_buff *skb;
int err;
skb = copy_vport_from_user(uodp_vport, a);
err = PTR_ERR(skb);
if (IS_ERR(skb))
goto exit;
rtnl_lock();
vport = lookup_vport((struct odp_vport *)skb->data, a);
err = PTR_ERR(vport);
if (IS_ERR(vport))
goto exit_free;
dp = vport->dp;
err = -EINVAL;
if (vport->port_no == ODPP_LOCAL)
goto exit_free;
err = dp_detach_port(vport);
mutex_unlock(&dp->mutex);
exit_free:
kfree_skb(skb);
rtnl_unlock();
exit:
return err;
}
static int get_vport(struct odp_vport __user *uodp_vport)
{
struct nlattr *a[ODP_VPORT_ATTR_MAX + 1];
struct odp_vport *odp_vport;
struct vport *vport;
struct sk_buff *skb;
int err;
skb = copy_vport_from_user(uodp_vport, a);
err = PTR_ERR(skb);
if (IS_ERR(skb))
goto exit;
odp_vport = (struct odp_vport *)skb->data;
vport = lookup_vport(odp_vport, a);
err = PTR_ERR(vport);
if (IS_ERR(vport))
goto exit_free;
err = copy_vport_to_user(uodp_vport, vport, odp_vport->total_len);
mutex_unlock(&vport->dp->mutex);
exit_free:
kfree_skb(skb);
exit:
return err;
}
static int dump_vport(struct odp_vport __user *uodp_vport)
{
struct nlattr *a[ODP_VPORT_ATTR_MAX + 1];
struct odp_vport *odp_vport;
struct sk_buff *skb;
struct datapath *dp;
u32 port_no;
int err;
skb = copy_vport_from_user(uodp_vport, a);
err = PTR_ERR(skb);
if (IS_ERR(skb))
goto exit;
odp_vport = (struct odp_vport *)skb->data;
dp = get_dp_locked(odp_vport->dp_idx);
err = -ENODEV;
if (!dp)
goto exit_free;
port_no = 0;
if (a[ODP_VPORT_ATTR_PORT_NO])
port_no = nla_get_u32(a[ODP_VPORT_ATTR_PORT_NO]);
for (; port_no < DP_MAX_PORTS; port_no++) {
struct vport *vport = get_vport_protected(dp, port_no);
if (vport) {
err = copy_vport_to_user(uodp_vport, vport, odp_vport->total_len);
goto exit_unlock_dp;
}
}
err = -ENODEV;
exit_unlock_dp:
mutex_unlock(&dp->mutex);
exit_free:
kfree_skb(skb);
exit:
return err;
}
static long openvswitch_ioctl(struct file *f, unsigned int cmd,
unsigned long argp)
{
int dp_idx = iminor(f->f_dentry->d_inode);
struct datapath *dp;
int listeners;
int err;
/* Handle commands with special locking requirements up front. */
switch (cmd) {
case ODP_DP_NEW:
err = new_datapath((struct odp_datapath __user *)argp);
goto exit;
case ODP_DP_GET:
err = get_datapath((struct odp_datapath __user *)argp);
goto exit;
case ODP_DP_DEL:
err = del_datapath((struct odp_datapath __user *)argp);
goto exit;
case ODP_DP_SET:
err = set_datapath((struct odp_datapath __user *)argp);
goto exit;
case ODP_DP_DUMP:
err = dump_datapath((struct odp_datapath __user *)argp);
goto exit;
case ODP_VPORT_NEW:
err = attach_vport((struct odp_vport __user *)argp);
goto exit;
case ODP_VPORT_GET:
err = get_vport((struct odp_vport __user *)argp);
goto exit;
case ODP_VPORT_DEL:
err = del_vport(cmd, (struct odp_vport __user *)argp);
goto exit;
case ODP_VPORT_SET:
err = set_vport(cmd, (struct odp_vport __user *)argp);
goto exit;
case ODP_VPORT_DUMP:
err = dump_vport((struct odp_vport __user *)argp);
goto exit;
case ODP_FLOW_FLUSH:
err = flush_flows(argp);
goto exit;
case ODP_FLOW_NEW:
case ODP_FLOW_SET:
err = new_flow(cmd, (struct odp_flow __user *)argp);
goto exit;
case ODP_FLOW_GET:
case ODP_FLOW_DEL:
err = get_or_del_flow(cmd, (struct odp_flow __user *)argp);
goto exit;
case ODP_FLOW_DUMP:
err = dump_flow((struct odp_flow __user *)argp);
goto exit;
case ODP_EXECUTE:
err = execute_packet((struct odp_upcall __user *)argp);
goto exit;
}
dp = get_dp_locked(dp_idx);
err = -ENODEV;
if (!dp)
goto exit;
switch (cmd) {
case ODP_GET_LISTEN_MASK:
err = put_user(get_listen_mask(f), (int __user *)argp);
break;
case ODP_SET_LISTEN_MASK:
err = get_user(listeners, (int __user *)argp);
if (err)
break;
err = -EINVAL;
if (listeners & ~ODPL_ALL)
break;
err = 0;
set_listen_mask(f, listeners);
break;
default:
err = -ENOIOCTLCMD;
break;
}
mutex_unlock(&dp->mutex);
exit:
return err;
}
static int dp_has_packet_of_interest(struct datapath *dp, int listeners)
{
int i;
for (i = 0; i < DP_N_QUEUES; i++) {
if (listeners & (1 << i) && !skb_queue_empty(&dp->queues[i]))
return 1;
}
return 0;
}
#ifdef CONFIG_COMPAT
static long openvswitch_compat_ioctl(struct file *f, unsigned int cmd, unsigned long argp)
{
switch (cmd) {
case ODP_FLOW_FLUSH:
/* Ioctls that don't need any translation at all. */
return openvswitch_ioctl(f, cmd, argp);
case ODP_DP_NEW:
case ODP_DP_GET:
case ODP_DP_DEL:
case ODP_DP_SET:
case ODP_DP_DUMP:
case ODP_VPORT_NEW:
case ODP_VPORT_DEL:
case ODP_VPORT_GET:
case ODP_VPORT_SET:
case ODP_VPORT_DUMP:
case ODP_FLOW_NEW:
case ODP_FLOW_DEL:
case ODP_FLOW_GET:
case ODP_FLOW_SET:
case ODP_FLOW_DUMP:
case ODP_SET_LISTEN_MASK:
case ODP_GET_LISTEN_MASK:
case ODP_EXECUTE:
/* Ioctls that just need their pointer argument extended. */
return openvswitch_ioctl(f, cmd, (unsigned long)compat_ptr(argp));
default:
return -ENOIOCTLCMD;
}
}
#endif
static ssize_t openvswitch_read(struct file *f, char __user *buf,
size_t nbytes, loff_t *ppos)
{
int listeners = get_listen_mask(f);
int dp_idx = iminor(f->f_dentry->d_inode);
struct datapath *dp = get_dp_locked(dp_idx);
struct sk_buff *skb;
struct iovec iov;
int retval;
if (!dp)
return -ENODEV;
if (nbytes == 0 || !listeners)
return 0;
for (;;) {
int i;
for (i = 0; i < DP_N_QUEUES; i++) {
if (listeners & (1 << i)) {
skb = skb_dequeue(&dp->queues[i]);
if (skb)
goto success;
}
}
if (f->f_flags & O_NONBLOCK) {
retval = -EAGAIN;
goto error;
}
wait_event_interruptible(dp->waitqueue,
dp_has_packet_of_interest(dp,
listeners));
if (signal_pending(current)) {
retval = -ERESTARTSYS;
goto error;
}
}
success:
mutex_unlock(&dp->mutex);
iov.iov_base = buf;
iov.iov_len = min_t(size_t, skb->len, nbytes);
retval = skb_copy_datagram_iovec(skb, 0, &iov, iov.iov_len);
if (!retval)
retval = skb->len;
kfree_skb(skb);
return retval;
error:
mutex_unlock(&dp->mutex);
return retval;
}
static unsigned int openvswitch_poll(struct file *file, poll_table *wait)
{
int dp_idx = iminor(file->f_dentry->d_inode);
struct datapath *dp = get_dp_locked(dp_idx);
unsigned int mask;
if (dp) {
mask = 0;
poll_wait(file, &dp->waitqueue, wait);
if (dp_has_packet_of_interest(dp, get_listen_mask(file)))
mask |= POLLIN | POLLRDNORM;
mutex_unlock(&dp->mutex);
} else {
mask = POLLIN | POLLRDNORM | POLLHUP;
}
return mask;
}
static struct file_operations openvswitch_fops = {
.owner = THIS_MODULE,
.read = openvswitch_read,
.poll = openvswitch_poll,
.unlocked_ioctl = openvswitch_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = openvswitch_compat_ioctl,
#endif
};
static int major;
static int __init dp_init(void)
{
struct sk_buff *dummy_skb;
int err;
BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > sizeof(dummy_skb->cb));
printk("Open vSwitch %s, built "__DATE__" "__TIME__"\n", VERSION BUILDNR);
err = flow_init();
if (err)
goto error;
err = vport_init();
if (err)
goto error_flow_exit;
err = register_netdevice_notifier(&dp_device_notifier);
if (err)
goto error_vport_exit;
major = register_chrdev(0, "openvswitch", &openvswitch_fops);
if (err < 0)
goto error_unreg_notifier;
return 0;
error_unreg_notifier:
unregister_netdevice_notifier(&dp_device_notifier);
error_vport_exit:
vport_exit();
error_flow_exit:
flow_exit();
error:
return err;
}
static void dp_cleanup(void)
{
rcu_barrier();
unregister_chrdev(major, "openvswitch");
unregister_netdevice_notifier(&dp_device_notifier);
vport_exit();
flow_exit();
}
module_init(dp_init);
module_exit(dp_cleanup);
MODULE_DESCRIPTION("Open vSwitch switching datapath");
MODULE_LICENSE("GPL");
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