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Message-Id: <20250116-tun-v3-9-c6b2871e97f7@daynix.com>
Date: Thu, 16 Jan 2025 17:08:12 +0900
From: Akihiko Odaki <akihiko.odaki@...nix.com>
To: Jonathan Corbet <corbet@....net>,
Willem de Bruijn <willemdebruijn.kernel@...il.com>,
Jason Wang <jasowang@...hat.com>, "David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>, "Michael S. Tsirkin" <mst@...hat.com>,
Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, Shuah Khan <shuah@...nel.org>,
linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
netdev@...r.kernel.org, kvm@...r.kernel.org,
virtualization@...ts.linux-foundation.org, linux-kselftest@...r.kernel.org,
Yuri Benditovich <yuri.benditovich@...nix.com>,
Andrew Melnychenko <andrew@...nix.com>,
Stephen Hemminger <stephen@...workplumber.org>, gur.stavi@...wei.com,
devel@...nix.com, Akihiko Odaki <akihiko.odaki@...nix.com>
Subject: [PATCH net v3 9/9] tap: Use tun's vnet-related code
tun and tap implements the same vnet-related features so reuse the code.
Signed-off-by: Akihiko Odaki <akihiko.odaki@...nix.com>
---
drivers/net/Kconfig | 1 +
drivers/net/Makefile | 6 +-
drivers/net/tap.c | 152 +++++--------------------------------------------
drivers/net/tun_vnet.c | 5 ++
4 files changed, 24 insertions(+), 140 deletions(-)
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index 1fd5acdc73c6..c420418473fc 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -395,6 +395,7 @@ config TUN
tristate "Universal TUN/TAP device driver support"
depends on INET
select CRC32
+ select TAP
help
TUN/TAP provides packet reception and transmission for user space
programs. It can be viewed as a simple Point-to-Point or Ethernet
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index bb8eb3053772..2275309a97ee 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -29,9 +29,9 @@ obj-y += mdio/
obj-y += pcs/
obj-$(CONFIG_RIONET) += rionet.o
obj-$(CONFIG_NET_TEAM) += team/
-obj-$(CONFIG_TUN) += tun-drv.o
-tun-drv-y := tun.o tun_vnet.o
-obj-$(CONFIG_TAP) += tap.o
+obj-$(CONFIG_TUN) += tun.o
+obj-$(CONFIG_TAP) += tap-drv.o
+tap-drv-y := tap.o tun_vnet.o
obj-$(CONFIG_VETH) += veth.o
obj-$(CONFIG_VIRTIO_NET) += virtio_net.o
obj-$(CONFIG_VXLAN) += vxlan/
diff --git a/drivers/net/tap.c b/drivers/net/tap.c
index 7ee2e9ee2a89..4f3cc3b2e3c6 100644
--- a/drivers/net/tap.c
+++ b/drivers/net/tap.c
@@ -26,74 +26,9 @@
#include <linux/virtio_net.h>
#include <linux/skb_array.h>
-#define TAP_IFFEATURES (IFF_VNET_HDR | IFF_MULTI_QUEUE)
-
-#define TAP_VNET_LE 0x80000000
-#define TAP_VNET_BE 0x40000000
-
-#ifdef CONFIG_TUN_VNET_CROSS_LE
-static inline bool tap_legacy_is_little_endian(struct tap_queue *q)
-{
- return q->flags & TAP_VNET_BE ? false :
- virtio_legacy_is_little_endian();
-}
-
-static long tap_get_vnet_be(struct tap_queue *q, int __user *sp)
-{
- int s = !!(q->flags & TAP_VNET_BE);
-
- if (put_user(s, sp))
- return -EFAULT;
-
- return 0;
-}
-
-static long tap_set_vnet_be(struct tap_queue *q, int __user *sp)
-{
- int s;
-
- if (get_user(s, sp))
- return -EFAULT;
-
- if (s)
- q->flags |= TAP_VNET_BE;
- else
- q->flags &= ~TAP_VNET_BE;
-
- return 0;
-}
-#else
-static inline bool tap_legacy_is_little_endian(struct tap_queue *q)
-{
- return virtio_legacy_is_little_endian();
-}
-
-static long tap_get_vnet_be(struct tap_queue *q, int __user *argp)
-{
- return -EINVAL;
-}
-
-static long tap_set_vnet_be(struct tap_queue *q, int __user *argp)
-{
- return -EINVAL;
-}
-#endif /* CONFIG_TUN_VNET_CROSS_LE */
-
-static inline bool tap_is_little_endian(struct tap_queue *q)
-{
- return q->flags & TAP_VNET_LE ||
- tap_legacy_is_little_endian(q);
-}
-
-static inline u16 tap16_to_cpu(struct tap_queue *q, __virtio16 val)
-{
- return __virtio16_to_cpu(tap_is_little_endian(q), val);
-}
+#include "tun_vnet.h"
-static inline __virtio16 cpu_to_tap16(struct tap_queue *q, u16 val)
-{
- return __cpu_to_virtio16(tap_is_little_endian(q), val);
-}
+#define TAP_IFFEATURES (IFF_VNET_HDR | IFF_MULTI_QUEUE)
static struct proto tap_proto = {
.name = "tap",
@@ -655,25 +590,11 @@ static ssize_t tap_get_user(struct tap_queue *q, void *msg_control,
if (q->flags & IFF_VNET_HDR) {
vnet_hdr_len = READ_ONCE(q->vnet_hdr_sz);
- err = -EINVAL;
- if (iov_iter_count(from) < vnet_hdr_len)
- goto err;
-
- err = -EFAULT;
- if (!copy_from_iter_full(&vnet_hdr, sizeof(vnet_hdr), from))
- goto err;
- iov_iter_advance(from, vnet_hdr_len - sizeof(vnet_hdr));
- if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
- tap16_to_cpu(q, vnet_hdr.csum_start) +
- tap16_to_cpu(q, vnet_hdr.csum_offset) + 2 >
- tap16_to_cpu(q, vnet_hdr.hdr_len))
- vnet_hdr.hdr_len = cpu_to_tap16(q,
- tap16_to_cpu(q, vnet_hdr.csum_start) +
- tap16_to_cpu(q, vnet_hdr.csum_offset) + 2);
- err = -EINVAL;
- if (tap16_to_cpu(q, vnet_hdr.hdr_len) > iov_iter_count(from))
+ hdr_len = tun_vnet_hdr_get(vnet_hdr_len, q->flags, from, &vnet_hdr);
+ if (hdr_len < 0) {
+ err = hdr_len;
goto err;
- hdr_len = tap16_to_cpu(q, vnet_hdr.hdr_len);
+ }
}
len = iov_iter_count(from);
@@ -731,8 +652,7 @@ static ssize_t tap_get_user(struct tap_queue *q, void *msg_control,
skb->dev = tap->dev;
if (vnet_hdr_len) {
- err = virtio_net_hdr_to_skb(skb, &vnet_hdr,
- tap_is_little_endian(q));
+ err = tun_vnet_hdr_to_skb(q->flags, skb, &vnet_hdr);
if (err) {
rcu_read_unlock();
drop_reason = SKB_DROP_REASON_DEV_HDR;
@@ -795,23 +715,17 @@ static ssize_t tap_put_user(struct tap_queue *q,
int total;
if (q->flags & IFF_VNET_HDR) {
- int vlan_hlen = skb_vlan_tag_present(skb) ? VLAN_HLEN : 0;
struct virtio_net_hdr vnet_hdr;
vnet_hdr_len = READ_ONCE(q->vnet_hdr_sz);
- if (iov_iter_count(iter) < vnet_hdr_len)
- return -EINVAL;
- if (virtio_net_hdr_from_skb(skb, &vnet_hdr,
- tap_is_little_endian(q), true,
- vlan_hlen))
- BUG();
-
- if (copy_to_iter(&vnet_hdr, sizeof(vnet_hdr), iter) !=
- sizeof(vnet_hdr))
- return -EFAULT;
+ ret = tun_vnet_hdr_from_skb(q->flags, NULL, skb, &vnet_hdr);
+ if (ret)
+ return ret;
- iov_iter_advance(iter, vnet_hdr_len - sizeof(vnet_hdr));
+ ret = tun_vnet_hdr_put(vnet_hdr_len, iter, &vnet_hdr);
+ if (ret)
+ return ret;
}
total = vnet_hdr_len;
total += skb->len;
@@ -1070,42 +984,6 @@ static long tap_ioctl(struct file *file, unsigned int cmd,
q->sk.sk_sndbuf = s;
return 0;
- case TUNGETVNETHDRSZ:
- s = q->vnet_hdr_sz;
- if (put_user(s, sp))
- return -EFAULT;
- return 0;
-
- case TUNSETVNETHDRSZ:
- if (get_user(s, sp))
- return -EFAULT;
- if (s < (int)sizeof(struct virtio_net_hdr))
- return -EINVAL;
-
- q->vnet_hdr_sz = s;
- return 0;
-
- case TUNGETVNETLE:
- s = !!(q->flags & TAP_VNET_LE);
- if (put_user(s, sp))
- return -EFAULT;
- return 0;
-
- case TUNSETVNETLE:
- if (get_user(s, sp))
- return -EFAULT;
- if (s)
- q->flags |= TAP_VNET_LE;
- else
- q->flags &= ~TAP_VNET_LE;
- return 0;
-
- case TUNGETVNETBE:
- return tap_get_vnet_be(q, sp);
-
- case TUNSETVNETBE:
- return tap_set_vnet_be(q, sp);
-
case TUNSETOFFLOAD:
/* let the user check for future flags */
if (arg & ~(TUN_F_CSUM | TUN_F_TSO4 | TUN_F_TSO6 |
@@ -1149,7 +1027,7 @@ static long tap_ioctl(struct file *file, unsigned int cmd,
return ret;
default:
- return -EINVAL;
+ return tun_vnet_ioctl(&q->vnet_hdr_sz, &q->flags, cmd, sp);
}
}
@@ -1196,7 +1074,7 @@ static int tap_get_user_xdp(struct tap_queue *q, struct xdp_buff *xdp)
skb->protocol = eth_hdr(skb)->h_proto;
if (vnet_hdr_len) {
- err = virtio_net_hdr_to_skb(skb, gso, tap_is_little_endian(q));
+ err = tun_vnet_hdr_to_skb(q->flags, skb, gso);
if (err)
goto err_kfree;
}
diff --git a/drivers/net/tun_vnet.c b/drivers/net/tun_vnet.c
index 5a6cbfb6eed0..960a5fa5a332 100644
--- a/drivers/net/tun_vnet.c
+++ b/drivers/net/tun_vnet.c
@@ -104,6 +104,7 @@ long tun_vnet_ioctl(int *sz, unsigned int *flags,
return -EINVAL;
}
}
+EXPORT_SYMBOL_GPL(tun_vnet_ioctl);
int tun_vnet_hdr_get(int sz, unsigned int flags, struct iov_iter *from,
struct virtio_net_hdr *hdr)
@@ -125,6 +126,7 @@ int tun_vnet_hdr_get(int sz, unsigned int flags, struct iov_iter *from,
return tun16_to_cpu(flags, hdr->hdr_len);
}
+EXPORT_SYMBOL_GPL(tun_vnet_hdr_get);
int tun_vnet_hdr_put(int sz, struct iov_iter *iter,
const struct virtio_net_hdr *hdr)
@@ -139,12 +141,14 @@ int tun_vnet_hdr_put(int sz, struct iov_iter *iter,
return 0;
}
+EXPORT_SYMBOL_GPL(tun_vnet_hdr_put);
int tun_vnet_hdr_to_skb(unsigned int flags, struct sk_buff *skb,
const struct virtio_net_hdr *hdr)
{
return virtio_net_hdr_to_skb(skb, hdr, tun_is_little_endian(flags));
}
+EXPORT_SYMBOL_GPL(tun_vnet_hdr_to_skb);
int tun_vnet_hdr_from_skb(unsigned int flags,
const struct net_device *dev,
@@ -173,3 +177,4 @@ int tun_vnet_hdr_from_skb(unsigned int flags,
return 0;
}
+EXPORT_SYMBOL_GPL(tun_vnet_hdr_from_skb);
--
2.47.1
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