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mac80211_hwsim: add frame transmission support over virtio

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This allows communication with external entities.

It also required fixing up the netlink policy, since NLA_UNSPEC
attributes are no longer accepted.

Signed-off-by: Erel Geron <erelx.geron@intel.com>
[port to backports, inline the ID, use 29 as the ID as requested,
 drop != NULL checks, reduce ifdefs]
Link: https://lore.kernel.org/r/20200305143212.c6e4c87d225b.I7ce60bf143e863dcdf0fb8040aab7168ba549b99@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Erel Geron 2020-03-05 14:32:14 +01:00 committed by Johannes Berg
parent 1f7e9f46c2
commit 5d44fe7c98
3 changed files with 331 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

311
drivers/net/wireless/mac80211_hwsim.c
View File

@ -4,7 +4,7 @@
* Copyright (c) 2008, Jouni Malinen <j@w1.fi>
* Copyright (c) 2011, Javier Lopez <jlopex@gmail.com>
* Copyright (c) 2016 - 2017 Intel Deutschland GmbH
* Copyright (C) 2018 Intel Corporation
* Copyright (C) 2018 - 2020 Intel Corporation
*/
/*
@ -33,6 +33,9 @@
#include <net/netns/generic.h>
#include <linux/rhashtable.h>
#include <linux/nospec.h>
#include <linux/virtio.h>
#include <linux/virtio_ids.h>
#include <linux/virtio_config.h>
#include "mac80211_hwsim.h"
#define WARN_QUEUE 100
@ -613,14 +616,14 @@ static const struct genl_multicast_group hwsim_mcgrps[] = {
/* MAC80211_HWSIM netlink policy */
static const struct nla_policy hwsim_genl_policy[HWSIM_ATTR_MAX + 1] = {
[HWSIM_ATTR_ADDR_RECEIVER] = { .type = NLA_UNSPEC, .len = ETH_ALEN },
[HWSIM_ATTR_ADDR_TRANSMITTER] = { .type = NLA_UNSPEC, .len = ETH_ALEN },
[HWSIM_ATTR_ADDR_RECEIVER] = NLA_POLICY_ETH_ADDR_COMPAT,
[HWSIM_ATTR_ADDR_TRANSMITTER] = NLA_POLICY_ETH_ADDR_COMPAT,
[HWSIM_ATTR_FRAME] = { .type = NLA_BINARY,
.len = IEEE80211_MAX_DATA_LEN },
[HWSIM_ATTR_FLAGS] = { .type = NLA_U32 },
[HWSIM_ATTR_RX_RATE] = { .type = NLA_U32 },
[HWSIM_ATTR_SIGNAL] = { .type = NLA_U32 },
[HWSIM_ATTR_TX_INFO] = { .type = NLA_UNSPEC,
[HWSIM_ATTR_TX_INFO] = { .type = NLA_BINARY,
.len = IEEE80211_TX_MAX_RATES *
sizeof(struct hwsim_tx_rate)},
[HWSIM_ATTR_COOKIE] = { .type = NLA_U64 },
@ -630,15 +633,61 @@ static const struct nla_policy hwsim_genl_policy[HWSIM_ATTR_MAX + 1] = {
[HWSIM_ATTR_REG_CUSTOM_REG] = { .type = NLA_U32 },
[HWSIM_ATTR_REG_STRICT_REG] = { .type = NLA_FLAG },
[HWSIM_ATTR_SUPPORT_P2P_DEVICE] = { .type = NLA_FLAG },
[HWSIM_ATTR_USE_CHANCTX] = { .type = NLA_FLAG },
[HWSIM_ATTR_DESTROY_RADIO_ON_CLOSE] = { .type = NLA_FLAG },
[HWSIM_ATTR_RADIO_NAME] = { .type = NLA_STRING },
[HWSIM_ATTR_NO_VIF] = { .type = NLA_FLAG },
[HWSIM_ATTR_FREQ] = { .type = NLA_U32 },
[HWSIM_ATTR_PERM_ADDR] = { .type = NLA_UNSPEC, .len = ETH_ALEN },
[HWSIM_ATTR_TX_INFO_FLAGS] = { .type = NLA_BINARY },
[HWSIM_ATTR_PERM_ADDR] = NLA_POLICY_ETH_ADDR_COMPAT,
[HWSIM_ATTR_IFTYPE_SUPPORT] = { .type = NLA_U32 },
[HWSIM_ATTR_CIPHER_SUPPORT] = { .type = NLA_BINARY },
};
#if IS_REACHABLE(CONFIG_VIRTIO)
/* MAC80211_HWSIM virtio queues */
static struct virtqueue *hwsim_vqs[HWSIM_NUM_VQS];
static bool hwsim_virtio_enabled;
static spinlock_t hwsim_virtio_lock;
static void hwsim_virtio_rx_work(struct work_struct *work);
static DECLARE_WORK(hwsim_virtio_rx, hwsim_virtio_rx_work);
static int hwsim_tx_virtio(struct mac80211_hwsim_data *data,
struct sk_buff *skb)
{
struct scatterlist sg[1];
unsigned long flags;
int err;
spin_lock_irqsave(&hwsim_virtio_lock, flags);
if (!hwsim_virtio_enabled) {
err = -ENODEV;
goto out_free;
}
sg_init_one(sg, skb->head, skb_end_offset(skb));
err = virtqueue_add_outbuf(hwsim_vqs[HWSIM_VQ_TX], sg, 1, skb,
GFP_ATOMIC);
if (err)
goto out_free;
virtqueue_kick(hwsim_vqs[HWSIM_VQ_TX]);
spin_unlock_irqrestore(&hwsim_virtio_lock, flags);
return 0;
out_free:
spin_unlock_irqrestore(&hwsim_virtio_lock, flags);
nlmsg_free(skb);
return err;
}
#else
/* cause a linker error if this ends up being needed */
extern int hwsim_tx_virtio(struct mac80211_hwsim_data *data,
struct sk_buff *skb);
#define hwsim_virtio_enabled false
#endif
static void mac80211_hwsim_tx_frame(struct ieee80211_hw *hw,
struct sk_buff *skb,
struct ieee80211_channel *chan);
@ -1138,8 +1187,14 @@ static void mac80211_hwsim_tx_frame_nl(struct ieee80211_hw *hw,
goto nla_put_failure;
genlmsg_end(skb, msg_head);
if (hwsim_virtio_enabled) {
if (hwsim_tx_virtio(data, skb))
goto err_free_txskb;
} else {
if (hwsim_unicast_netgroup(data, skb, dst_portid))
goto err_free_txskb;
}
/* Enqueue the packet */
skb_queue_tail(&data->pending, my_skb);
@ -1441,7 +1496,7 @@ static void mac80211_hwsim_tx(struct ieee80211_hw *hw,
/* wmediumd mode check */
_portid = READ_ONCE(data->wmediumd);
if (_portid)
if (_portid || hwsim_virtio_enabled)
return mac80211_hwsim_tx_frame_nl(hw, skb, _portid);
/* NO wmediumd detected, perfect medium simulation */
@ -1547,7 +1602,7 @@ static void mac80211_hwsim_tx_frame(struct ieee80211_hw *hw,
mac80211_hwsim_monitor_rx(hw, skb, chan);
if (_pid)
if (_pid || hwsim_virtio_enabled)
return mac80211_hwsim_tx_frame_nl(hw, skb, _pid);
mac80211_hwsim_tx_frame_no_nl(hw, skb, chan);
@ -3293,11 +3348,14 @@ static int hwsim_tx_info_frame_received_nl(struct sk_buff *skb_2,
if (!data2)
goto out;
if (hwsim_net_get_netgroup(genl_info_net(info)) != data2->netgroup)
if (!hwsim_virtio_enabled) {
if (hwsim_net_get_netgroup(genl_info_net(info)) !=
data2->netgroup)
goto out;
if (info->snd_portid != data2->wmediumd)
goto out;
}
/* look for the skb matching the cookie passed back from user */
skb_queue_walk_safe(&data2->pending, skb, tmp) {
@ -3387,11 +3445,14 @@ static int hwsim_cloned_frame_received_nl(struct sk_buff *skb_2,
if (!data2)
goto out;
if (hwsim_net_get_netgroup(genl_info_net(info)) != data2->netgroup)
if (!hwsim_virtio_enabled) {
if (hwsim_net_get_netgroup(genl_info_net(info)) !=
data2->netgroup)
goto out;
if (info->snd_portid != data2->wmediumd)
goto out;
}
/* check if radio is configured properly */
@ -3932,6 +3993,229 @@ static void hwsim_exit_netlink(void)
genl_unregister_family(&hwsim_genl_family);
}
#if IS_REACHABLE(CONFIG_VIRTIO)
static void hwsim_virtio_tx_done(struct virtqueue *vq)
{
unsigned int len;
struct sk_buff *skb;
unsigned long flags;
spin_lock_irqsave(&hwsim_virtio_lock, flags);
while ((skb = virtqueue_get_buf(vq, &len)))
nlmsg_free(skb);
spin_unlock_irqrestore(&hwsim_virtio_lock, flags);
}
static int hwsim_virtio_handle_cmd(struct sk_buff *skb)
{
struct nlmsghdr *nlh;
struct genlmsghdr *gnlh;
struct nlattr *tb[HWSIM_ATTR_MAX + 1];
struct genl_info info = {};
int err;
nlh = nlmsg_hdr(skb);
gnlh = nlmsg_data(nlh);
err = genlmsg_parse(nlh, &hwsim_genl_family, tb, HWSIM_ATTR_MAX,
hwsim_genl_policy, NULL);
if (err) {
pr_err_ratelimited("hwsim: genlmsg_parse returned %d\n", err);
return err;
}
info.attrs = tb;
switch (gnlh->cmd) {
case HWSIM_CMD_FRAME:
hwsim_cloned_frame_received_nl(skb, &info);
break;
case HWSIM_CMD_TX_INFO_FRAME:
hwsim_tx_info_frame_received_nl(skb, &info);
break;
default:
pr_err_ratelimited("hwsim: invalid cmd: %d\n", gnlh->cmd);
return -EPROTO;
}
return 0;
}
static void hwsim_virtio_rx_work(struct work_struct *work)
{
struct virtqueue *vq;
unsigned int len;
struct sk_buff *skb;
struct scatterlist sg[1];
int err;
unsigned long flags;
spin_lock_irqsave(&hwsim_virtio_lock, flags);
if (!hwsim_virtio_enabled)
goto out_unlock;
skb = virtqueue_get_buf(hwsim_vqs[HWSIM_VQ_RX], &len);
if (!skb)
goto out_unlock;
spin_unlock_irqrestore(&hwsim_virtio_lock, flags);
skb->data = skb->head;
skb_set_tail_pointer(skb, len);
hwsim_virtio_handle_cmd(skb);
spin_lock_irqsave(&hwsim_virtio_lock, flags);
if (!hwsim_virtio_enabled) {
nlmsg_free(skb);
goto out_unlock;
}
vq = hwsim_vqs[HWSIM_VQ_RX];
sg_init_one(sg, skb->head, skb_end_offset(skb));
err = virtqueue_add_inbuf(vq, sg, 1, skb, GFP_KERNEL);
if (WARN(err, "virtqueue_add_inbuf returned %d\n", err))
nlmsg_free(skb);
else
virtqueue_kick(vq);
schedule_work(&hwsim_virtio_rx);
out_unlock:
spin_unlock_irqrestore(&hwsim_virtio_lock, flags);
}
static void hwsim_virtio_rx_done(struct virtqueue *vq)
{
schedule_work(&hwsim_virtio_rx);
}
static int init_vqs(struct virtio_device *vdev)
{
vq_callback_t *callbacks[HWSIM_NUM_VQS] = {
[HWSIM_VQ_TX] = hwsim_virtio_tx_done,
[HWSIM_VQ_RX] = hwsim_virtio_rx_done,
};
const char *names[HWSIM_NUM_VQS] = {
[HWSIM_VQ_TX] = "tx",
[HWSIM_VQ_RX] = "rx",
};
return virtio_find_vqs(vdev, HWSIM_NUM_VQS,
hwsim_vqs, callbacks, names, NULL);
}
static int fill_vq(struct virtqueue *vq)
{
int i, err;
struct sk_buff *skb;
struct scatterlist sg[1];
for (i = 0; i < virtqueue_get_vring_size(vq); i++) {
skb = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
if (!skb)
return -ENOMEM;
sg_init_one(sg, skb->head, skb_end_offset(skb));
err = virtqueue_add_inbuf(vq, sg, 1, skb, GFP_KERNEL);
if (err) {
nlmsg_free(skb);
return err;
}
}
virtqueue_kick(vq);
return 0;
}
static void remove_vqs(struct virtio_device *vdev)
{
int i;
vdev->config->reset(vdev);
for (i = 0; i < ARRAY_SIZE(hwsim_vqs); i++) {
struct virtqueue *vq = hwsim_vqs[i];
struct sk_buff *skb;
while ((skb = virtqueue_detach_unused_buf(vq)))
nlmsg_free(skb);
}
vdev->config->del_vqs(vdev);
}
static int hwsim_virtio_probe(struct virtio_device *vdev)
{
int err;
unsigned long flags;
spin_lock_irqsave(&hwsim_virtio_lock, flags);
if (hwsim_virtio_enabled) {
spin_unlock_irqrestore(&hwsim_virtio_lock, flags);
return -EEXIST;
}
spin_unlock_irqrestore(&hwsim_virtio_lock, flags);
err = init_vqs(vdev);
if (err)
return err;
err = fill_vq(hwsim_vqs[HWSIM_VQ_RX]);
if (err)
goto out_remove;
spin_lock_irqsave(&hwsim_virtio_lock, flags);
hwsim_virtio_enabled = true;
spin_unlock_irqrestore(&hwsim_virtio_lock, flags);
schedule_work(&hwsim_virtio_rx);
return 0;
out_remove:
remove_vqs(vdev);
return err;
}
static void hwsim_virtio_remove(struct virtio_device *vdev)
{
hwsim_virtio_enabled = false;
cancel_work_sync(&hwsim_virtio_rx);
remove_vqs(vdev);
}
/* MAC80211_HWSIM virtio device id table */
static const struct virtio_device_id id_table[] = {
{ VIRTIO_ID_MAC80211_HWSIM, VIRTIO_DEV_ANY_ID },
{ 0 }
};
MODULE_DEVICE_TABLE(virtio, id_table);
static struct virtio_driver virtio_hwsim = {
.driver.name = KBUILD_MODNAME,
.driver.owner = THIS_MODULE,
.id_table = id_table,
.probe = hwsim_virtio_probe,
.remove = hwsim_virtio_remove,
};
static int hwsim_register_virtio_driver(void)
{
spin_lock_init(&hwsim_virtio_lock);
return register_virtio_driver(&virtio_hwsim);
}
static void hwsim_unregister_virtio_driver(void)
{
unregister_virtio_driver(&virtio_hwsim);
}
#else
static inline int hwsim_register_virtio_driver(void)
{
return 0;
}
static inline void hwsim_unregister_virtio_driver(void)
{
}
#endif
static int __init init_mac80211_hwsim(void)
{
int i, err;
@ -3960,10 +4244,14 @@ static int __init init_mac80211_hwsim(void)
if (err)
goto out_unregister_driver;
err = hwsim_register_virtio_driver();
if (err)
goto out_exit_netlink;
hwsim_class = class_create(THIS_MODULE, "mac80211_hwsim");
if (IS_ERR(hwsim_class)) {
err = PTR_ERR(hwsim_class);
goto out_exit_netlink;
goto out_exit_virtio;
}
for (i = 0; i < radios; i++) {
@ -4075,6 +4363,8 @@ out_free_mon:
free_netdev(hwsim_mon);
out_free_radios:
mac80211_hwsim_free();
out_exit_virtio:
hwsim_unregister_virtio_driver();
out_exit_netlink:
hwsim_exit_netlink();
out_unregister_driver:
@ -4091,6 +4381,7 @@ static void __exit exit_mac80211_hwsim(void)
{
pr_debug("mac80211_hwsim: unregister radios\n");
hwsim_unregister_virtio_driver();
hwsim_exit_netlink();
mac80211_hwsim_free();

21
drivers/net/wireless/mac80211_hwsim.h
View File

@ -3,6 +3,7 @@
* mac80211_hwsim - software simulator of 802.11 radio(s) for mac80211
* Copyright (c) 2008, Jouni Malinen <j@w1.fi>
* Copyright (c) 2011, Javier Lopez <jlopex@gmail.com>
* Copyright (C) 2020 Intel Corporation
*/
#ifndef __MAC80211_HWSIM_H
@ -245,4 +246,24 @@ struct hwsim_tx_rate_flag {
s8 idx;
u16 flags;
} __packed;
/**
* DOC: Frame transmission support over virtio
*
* Frame transmission is also supported over virtio to allow communication
* with external entities.
*/
/**
* enum hwsim_vqs - queues for virtio frame transmission
*
* @HWSIM_VQ_TX: send frames to external entity
* @HWSIM_VQ_RX: receive frames and transmission info reports
* @HWSIM_NUM_VQS: enum limit
*/
enum {
HWSIM_VQ_TX,
HWSIM_VQ_RX,
HWSIM_NUM_VQS,
};
#endif /* __MAC80211_HWSIM_H */

1
include/uapi/linux/virtio_ids.h
View File

@ -46,5 +46,6 @@
#define VIRTIO_ID_IOMMU 23 /* virtio IOMMU */
#define VIRTIO_ID_FS 26 /* virtio filesystem */
#define VIRTIO_ID_PMEM 27 /* virtio pmem */
#define VIRTIO_ID_MAC80211_HWSIM 29 /* virtio mac80211-hwsim */
#endif /* _LINUX_VIRTIO_IDS_H */