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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , "Michael S. Tsirkin" , Xuan Zhuo , Shuah Khan , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, linux-kselftest@vger.kernel.org, Yuri Benditovich , Andrew Melnychenko , Stephen Hemminger , gur.stavi@huawei.com, devel@daynix.com, Akihiko Odaki X-Mailer: b4 0.14-dev-fd6e3 tun and tap implements the same vnet-related features so reuse the code. Signed-off-by: Akihiko Odaki --- 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 +=3D mdio/ obj-y +=3D pcs/ obj-$(CONFIG_RIONET) +=3D rionet.o obj-$(CONFIG_NET_TEAM) +=3D team/ -obj-$(CONFIG_TUN) +=3D tun-drv.o -tun-drv-y :=3D tun.o tun_vnet.o -obj-$(CONFIG_TAP) +=3D tap.o +obj-$(CONFIG_TUN) +=3D tun.o +obj-$(CONFIG_TAP) +=3D tap-drv.o +tap-drv-y :=3D tap.o tun_vnet.o obj-$(CONFIG_VETH) +=3D veth.o obj-$(CONFIG_VIRTIO_NET) +=3D virtio_net.o obj-$(CONFIG_VXLAN) +=3D 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 #include =20 -#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 =3D !!(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 |=3D TAP_VNET_BE; - else - q->flags &=3D ~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" =20 -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) =20 static struct proto tap_proto =3D { .name =3D "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 =3D READ_ONCE(q->vnet_hdr_sz); =20 - err =3D -EINVAL; - if (iov_iter_count(from) < vnet_hdr_len) - goto err; - - err =3D -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 =3D cpu_to_tap16(q, - tap16_to_cpu(q, vnet_hdr.csum_start) + - tap16_to_cpu(q, vnet_hdr.csum_offset) + 2); - err =3D -EINVAL; - if (tap16_to_cpu(q, vnet_hdr.hdr_len) > iov_iter_count(from)) + hdr_len =3D tun_vnet_hdr_get(vnet_hdr_len, q->flags, from, &vnet_hdr); + if (hdr_len < 0) { + err =3D hdr_len; goto err; - hdr_len =3D tap16_to_cpu(q, vnet_hdr.hdr_len); + } } =20 len =3D iov_iter_count(from); @@ -731,8 +652,7 @@ static ssize_t tap_get_user(struct tap_queue *q, void *= msg_control, skb->dev =3D tap->dev; =20 if (vnet_hdr_len) { - err =3D virtio_net_hdr_to_skb(skb, &vnet_hdr, - tap_is_little_endian(q)); + err =3D tun_vnet_hdr_to_skb(q->flags, skb, &vnet_hdr); if (err) { rcu_read_unlock(); drop_reason =3D SKB_DROP_REASON_DEV_HDR; @@ -795,23 +715,17 @@ static ssize_t tap_put_user(struct tap_queue *q, int total; =20 if (q->flags & IFF_VNET_HDR) { - int vlan_hlen =3D skb_vlan_tag_present(skb) ? VLAN_HLEN : 0; struct virtio_net_hdr vnet_hdr; =20 vnet_hdr_len =3D READ_ONCE(q->vnet_hdr_sz); - if (iov_iter_count(iter) < vnet_hdr_len) - return -EINVAL; =20 - 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) !=3D - sizeof(vnet_hdr)) - return -EFAULT; + ret =3D tun_vnet_hdr_from_skb(q->flags, NULL, skb, &vnet_hdr); + if (ret) + return ret; =20 - iov_iter_advance(iter, vnet_hdr_len - sizeof(vnet_hdr)); + ret =3D tun_vnet_hdr_put(vnet_hdr_len, iter, &vnet_hdr); + if (ret) + return ret; } total =3D vnet_hdr_len; total +=3D skb->len; @@ -1070,42 +984,6 @@ static long tap_ioctl(struct file *file, unsigned int= cmd, q->sk.sk_sndbuf =3D s; return 0; =20 - case TUNGETVNETHDRSZ: - s =3D 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 =3D s; - return 0; - - case TUNGETVNETLE: - s =3D !!(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 |=3D TAP_VNET_LE; - else - q->flags &=3D ~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; =20 default: - return -EINVAL; + return tun_vnet_ioctl(&q->vnet_hdr_sz, &q->flags, cmd, sp); } } =20 @@ -1196,7 +1074,7 @@ static int tap_get_user_xdp(struct tap_queue *q, stru= ct xdp_buff *xdp) skb->protocol =3D eth_hdr(skb)->h_proto; =20 if (vnet_hdr_len) { - err =3D virtio_net_hdr_to_skb(skb, gso, tap_is_little_endian(q)); + err =3D 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); =20 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, =20 return tun16_to_cpu(flags, hdr->hdr_len); } +EXPORT_SYMBOL_GPL(tun_vnet_hdr_get); =20 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, =20 return 0; } +EXPORT_SYMBOL_GPL(tun_vnet_hdr_put); =20 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); =20 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, =20 return 0; } +EXPORT_SYMBOL_GPL(tun_vnet_hdr_from_skb); --=20 2.47.1