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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Stefan Hajnoczi , "Michael S. Tsirkin" , Jason Wang , =?utf-8?q?Eugenio_P=C3=A9rez?= , Xuan Zhuo , "K. Y. Srinivasan" , Haiyang Zhang , Wei Liu , Dexuan Cui , Bryan Tan , Vishnu Dasa , Broadcom internal kernel review list , Shuah Khan , Long Li Cc: linux-kernel@vger.kernel.org, virtualization@lists.linux.dev, netdev@vger.kernel.org, kvm@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kselftest@vger.kernel.org, berrange@redhat.com, Sargun Dhillon , Bobby Eshleman , Bobby Eshleman X-Mailer: b4 0.14.3 From: Bobby Eshleman Add netns support to loopback and vhost. Keep netns disabled for virtio-vsock, but add necessary changes to comply with common API updates. This is the patch in the series when vhost-vsock namespaces actually come online. Signed-off-by: Bobby Eshleman --- Changes in v13: - do not store or pass the mode around now that net->vsock.mode is immutable - move virtio_transport_stream_allow() into virtio_transport.c because virtio is the only caller now Changes in v12: - change seqpacket_allow() and stream_allow() to return true for loopback and vhost (Stefano) Changes in v11: - reorder with the skb ownership patch for loopback (Stefano) - toggle vhost_transport_supports_local_mode() to true Changes in v10: - Splitting patches complicates the series with meaningless placeholder values that eventually get replaced anyway, so to avoid that this patch combines into one. Links to previous patches here: - Link: https://lore.kernel.org/all/20251111-vsock-vmtest-v9-3-852787a37b= ed@meta.com/ - Link: https://lore.kernel.org/all/20251111-vsock-vmtest-v9-6-852787a37b= ed@meta.com/ - Link: https://lore.kernel.org/all/20251111-vsock-vmtest-v9-7-852787a37b= ed@meta.com/ - remove placeholder values (Stefano) - update comment describe net/net_mode for virtio_transport_reset_no_sock() --- drivers/vhost/vsock.c | 41 ++++++++++++++++--------- include/linux/virtio_vsock.h | 5 +-- net/vmw_vsock/virtio_transport.c | 13 ++++++-- net/vmw_vsock/virtio_transport_common.c | 54 +++++++++++++++++++----------= ---- net/vmw_vsock/vsock_loopback.c | 14 +++++++-- 5 files changed, 84 insertions(+), 43 deletions(-) diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c index 8eca59fd1afb..d939cac2b52e 100644 --- a/drivers/vhost/vsock.c +++ b/drivers/vhost/vsock.c @@ -48,6 +48,8 @@ static DEFINE_READ_MOSTLY_HASHTABLE(vhost_vsock_hash, 8); struct vhost_vsock { struct vhost_dev dev; struct vhost_virtqueue vqs[2]; + struct net *net; + netns_tracker ns_tracker; =20 /* Link to global vhost_vsock_hash, writes use vhost_vsock_mutex */ struct hlist_node hash; @@ -69,7 +71,7 @@ static u32 vhost_transport_get_local_cid(void) /* Callers that dereference the return value must hold vhost_vsock_mutex o= r the * RCU read lock. */ -static struct vhost_vsock *vhost_vsock_get(u32 guest_cid) +static struct vhost_vsock *vhost_vsock_get(u32 guest_cid, struct net *net) { struct vhost_vsock *vsock; =20 @@ -80,9 +82,9 @@ static struct vhost_vsock *vhost_vsock_get(u32 guest_cid) if (other_cid =3D=3D 0) continue; =20 - if (other_cid =3D=3D guest_cid) + if (other_cid =3D=3D guest_cid && + vsock_net_check_mode(net, vsock->net)) return vsock; - } =20 return NULL; @@ -271,7 +273,7 @@ static void vhost_transport_send_pkt_work(struct vhost_= work *work) } =20 static int -vhost_transport_send_pkt(struct sk_buff *skb) +vhost_transport_send_pkt(struct sk_buff *skb, struct net *net) { struct virtio_vsock_hdr *hdr =3D virtio_vsock_hdr(skb); struct vhost_vsock *vsock; @@ -280,7 +282,7 @@ vhost_transport_send_pkt(struct sk_buff *skb) rcu_read_lock(); =20 /* Find the vhost_vsock according to guest context id */ - vsock =3D vhost_vsock_get(le64_to_cpu(hdr->dst_cid)); + vsock =3D vhost_vsock_get(le64_to_cpu(hdr->dst_cid), net); if (!vsock) { rcu_read_unlock(); kfree_skb(skb); @@ -307,7 +309,8 @@ vhost_transport_cancel_pkt(struct vsock_sock *vsk) rcu_read_lock(); =20 /* Find the vhost_vsock according to guest context id */ - vsock =3D vhost_vsock_get(vsk->remote_addr.svm_cid); + vsock =3D vhost_vsock_get(vsk->remote_addr.svm_cid, + sock_net(sk_vsock(vsk))); if (!vsock) goto out; =20 @@ -409,6 +412,12 @@ static bool vhost_transport_msgzerocopy_allow(void) static bool vhost_transport_seqpacket_allow(struct vsock_sock *vsk, u32 remote_cid); =20 +static bool +vhost_transport_stream_allow(struct vsock_sock *vsk, u32 cid, u32 port) +{ + return true; +} + static struct virtio_transport vhost_transport =3D { .transport =3D { .module =3D THIS_MODULE, @@ -433,7 +442,7 @@ static struct virtio_transport vhost_transport =3D { .stream_has_space =3D virtio_transport_stream_has_space, .stream_rcvhiwat =3D virtio_transport_stream_rcvhiwat, .stream_is_active =3D virtio_transport_stream_is_active, - .stream_allow =3D virtio_transport_stream_allow, + .stream_allow =3D vhost_transport_stream_allow, =20 .seqpacket_dequeue =3D virtio_transport_seqpacket_dequeue, .seqpacket_enqueue =3D virtio_transport_seqpacket_enqueue, @@ -466,14 +475,12 @@ static struct virtio_transport vhost_transport =3D { static bool vhost_transport_seqpacket_allow(struct vsock_sock *vsk, u32 remote_cid) { + struct net *net =3D sock_net(sk_vsock(vsk)); struct vhost_vsock *vsock; bool seqpacket_allow =3D false; =20 - if (vsock_net_mode(sock_net(sk_vsock(vsk))) !=3D VSOCK_NET_MODE_GLOBAL) - return false; - rcu_read_lock(); - vsock =3D vhost_vsock_get(remote_cid); + vsock =3D vhost_vsock_get(remote_cid, net); =20 if (vsock) seqpacket_allow =3D vsock->seqpacket_allow; @@ -544,7 +551,8 @@ static void vhost_vsock_handle_tx_kick(struct vhost_wor= k *work) if (le64_to_cpu(hdr->src_cid) =3D=3D vsock->guest_cid && le64_to_cpu(hdr->dst_cid) =3D=3D vhost_transport_get_local_cid()) - virtio_transport_recv_pkt(&vhost_transport, skb); + virtio_transport_recv_pkt(&vhost_transport, skb, + vsock->net); else kfree_skb(skb); =20 @@ -661,6 +669,7 @@ static int vhost_vsock_dev_open(struct inode *inode, st= ruct file *file) { struct vhost_virtqueue **vqs; struct vhost_vsock *vsock; + struct net *net; int ret; =20 /* This struct is large and allocation could fail, fall back to vmalloc @@ -676,6 +685,9 @@ static int vhost_vsock_dev_open(struct inode *inode, st= ruct file *file) goto out; } =20 + net =3D current->nsproxy->net_ns; + vsock->net =3D get_net_track(net, &vsock->ns_tracker, GFP_KERNEL); + vsock->guest_cid =3D 0; /* no CID assigned yet */ vsock->seqpacket_allow =3D false; =20 @@ -715,7 +727,7 @@ static void vhost_vsock_reset_orphans(struct sock *sk) */ =20 /* If the peer is still valid, no need to reset connection */ - if (vhost_vsock_get(vsk->remote_addr.svm_cid)) + if (vhost_vsock_get(vsk->remote_addr.svm_cid, sock_net(sk))) return; =20 /* If the close timeout is pending, let it expire. This avoids races @@ -760,6 +772,7 @@ static int vhost_vsock_dev_release(struct inode *inode,= struct file *file) virtio_vsock_skb_queue_purge(&vsock->send_pkt_queue); =20 vhost_dev_cleanup(&vsock->dev); + put_net_track(vsock->net, &vsock->ns_tracker); kfree(vsock->dev.vqs); vhost_vsock_free(vsock); return 0; @@ -786,7 +799,7 @@ static int vhost_vsock_set_cid(struct vhost_vsock *vsoc= k, u64 guest_cid) =20 /* Refuse if CID is already in use */ mutex_lock(&vhost_vsock_mutex); - other =3D vhost_vsock_get(guest_cid); + other =3D vhost_vsock_get(guest_cid, vsock->net); if (other && other !=3D vsock) { mutex_unlock(&vhost_vsock_mutex); return -EADDRINUSE; diff --git a/include/linux/virtio_vsock.h b/include/linux/virtio_vsock.h index 1845e8d4f78d..f91704731057 100644 --- a/include/linux/virtio_vsock.h +++ b/include/linux/virtio_vsock.h @@ -173,6 +173,7 @@ struct virtio_vsock_pkt_info { u32 remote_cid, remote_port; struct vsock_sock *vsk; struct msghdr *msg; + struct net *net; u32 pkt_len; u16 type; u16 op; @@ -185,7 +186,7 @@ struct virtio_transport { struct vsock_transport transport; =20 /* Takes ownership of the packet */ - int (*send_pkt)(struct sk_buff *skb); + int (*send_pkt)(struct sk_buff *skb, struct net *net); =20 /* Used in MSG_ZEROCOPY mode. Checks, that provided data * (number of buffers) could be transmitted with zerocopy @@ -280,7 +281,7 @@ virtio_transport_dgram_enqueue(struct vsock_sock *vsk, void virtio_transport_destruct(struct vsock_sock *vsk); =20 void virtio_transport_recv_pkt(struct virtio_transport *t, - struct sk_buff *skb); + struct sk_buff *skb, struct net *net); void virtio_transport_inc_tx_pkt(struct virtio_vsock_sock *vvs, struct sk_= buff *skb); u32 virtio_transport_get_credit(struct virtio_vsock_sock *vvs, u32 wanted); void virtio_transport_put_credit(struct virtio_vsock_sock *vvs, u32 credit= ); diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transp= ort.c index 37eeefddb48c..22ff5a503070 100644 --- a/net/vmw_vsock/virtio_transport.c +++ b/net/vmw_vsock/virtio_transport.c @@ -231,7 +231,7 @@ static int virtio_transport_send_skb_fast_path(struct v= irtio_vsock *vsock, struc } =20 static int -virtio_transport_send_pkt(struct sk_buff *skb) +virtio_transport_send_pkt(struct sk_buff *skb, struct net *net) { struct virtio_vsock_hdr *hdr; struct virtio_vsock *vsock; @@ -536,6 +536,11 @@ static bool virtio_transport_msgzerocopy_allow(void) return true; } =20 +bool virtio_transport_stream_allow(struct vsock_sock *vsk, u32 cid, u32 po= rt) +{ + return vsock_net_mode(sock_net(sk_vsock(vsk))) =3D=3D VSOCK_NET_MODE_GLOB= AL; +} + static bool virtio_transport_seqpacket_allow(struct vsock_sock *vsk, u32 remote_cid); =20 @@ -665,7 +670,11 @@ static void virtio_transport_rx_work(struct work_struc= t *work) virtio_vsock_skb_put(skb, payload_len); =20 virtio_transport_deliver_tap_pkt(skb); - virtio_transport_recv_pkt(&virtio_transport, skb); + + /* Force virtio-transport into global mode since it + * does not yet support local-mode namespacing. + */ + virtio_transport_recv_pkt(&virtio_transport, skb, NULL); } } while (!virtqueue_enable_cb(vq)); =20 diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio= _transport_common.c index 718be9f33274..c126aa235091 100644 --- a/net/vmw_vsock/virtio_transport_common.c +++ b/net/vmw_vsock/virtio_transport_common.c @@ -413,7 +413,7 @@ static int virtio_transport_send_pkt_info(struct vsock_= sock *vsk, =20 virtio_transport_inc_tx_pkt(vvs, skb); =20 - ret =3D t_ops->send_pkt(skb); + ret =3D t_ops->send_pkt(skb, info->net); if (ret < 0) break; =20 @@ -527,6 +527,7 @@ static int virtio_transport_send_credit_update(struct v= sock_sock *vsk) struct virtio_vsock_pkt_info info =3D { .op =3D VIRTIO_VSOCK_OP_CREDIT_UPDATE, .vsk =3D vsk, + .net =3D sock_net(sk_vsock(vsk)), }; =20 return virtio_transport_send_pkt_info(vsk, &info); @@ -1043,12 +1044,6 @@ bool virtio_transport_stream_is_active(struct vsock_= sock *vsk) } EXPORT_SYMBOL_GPL(virtio_transport_stream_is_active); =20 -bool virtio_transport_stream_allow(struct vsock_sock *vsk, u32 cid, u32 po= rt) -{ - return vsock_net_mode(sock_net(sk_vsock(vsk))) =3D=3D VSOCK_NET_MODE_GLOB= AL; -} -EXPORT_SYMBOL_GPL(virtio_transport_stream_allow); - int virtio_transport_dgram_bind(struct vsock_sock *vsk, struct sockaddr_vm *addr) { @@ -1067,6 +1062,7 @@ int virtio_transport_connect(struct vsock_sock *vsk) struct virtio_vsock_pkt_info info =3D { .op =3D VIRTIO_VSOCK_OP_REQUEST, .vsk =3D vsk, + .net =3D sock_net(sk_vsock(vsk)), }; =20 return virtio_transport_send_pkt_info(vsk, &info); @@ -1082,6 +1078,7 @@ int virtio_transport_shutdown(struct vsock_sock *vsk,= int mode) (mode & SEND_SHUTDOWN ? VIRTIO_VSOCK_SHUTDOWN_SEND : 0), .vsk =3D vsk, + .net =3D sock_net(sk_vsock(vsk)), }; =20 return virtio_transport_send_pkt_info(vsk, &info); @@ -1108,6 +1105,7 @@ virtio_transport_stream_enqueue(struct vsock_sock *vs= k, .msg =3D msg, .pkt_len =3D len, .vsk =3D vsk, + .net =3D sock_net(sk_vsock(vsk)), }; =20 return virtio_transport_send_pkt_info(vsk, &info); @@ -1145,6 +1143,7 @@ static int virtio_transport_reset(struct vsock_sock *= vsk, .op =3D VIRTIO_VSOCK_OP_RST, .reply =3D !!skb, .vsk =3D vsk, + .net =3D sock_net(sk_vsock(vsk)), }; =20 /* Send RST only if the original pkt is not a RST pkt */ @@ -1156,9 +1155,13 @@ static int virtio_transport_reset(struct vsock_sock = *vsk, =20 /* Normally packets are associated with a socket. There may be no socket = if an * attempt was made to connect to a socket that does not exist. + * + * net refers to the namespace of whoever sent the invalid message. For + * loopback, this is the namespace of the socket. For vhost, this is the + * namespace of the VM (i.e., vhost_vsock). */ static int virtio_transport_reset_no_sock(const struct virtio_transport *t, - struct sk_buff *skb) + struct sk_buff *skb, struct net *net) { struct virtio_vsock_hdr *hdr =3D virtio_vsock_hdr(skb); struct virtio_vsock_pkt_info info =3D { @@ -1171,6 +1174,12 @@ static int virtio_transport_reset_no_sock(const stru= ct virtio_transport *t, * sock_net(sk) until the reply skb is freed. */ .vsk =3D vsock_sk(skb->sk), + + /* net is not defined here because we pass it directly to + * t->send_pkt(), instead of relying on + * virtio_transport_send_pkt_info() to pass it. It is not needed + * by virtio_transport_alloc_skb(). + */ }; struct sk_buff *reply; =20 @@ -1189,7 +1198,7 @@ static int virtio_transport_reset_no_sock(const struc= t virtio_transport *t, if (!reply) return -ENOMEM; =20 - return t->send_pkt(reply); + return t->send_pkt(reply, net); } =20 /* This function should be called with sk_lock held and SOCK_DONE set */ @@ -1471,6 +1480,7 @@ virtio_transport_send_response(struct vsock_sock *vsk, .remote_port =3D le32_to_cpu(hdr->src_port), .reply =3D true, .vsk =3D vsk, + .net =3D sock_net(sk_vsock(vsk)), }; =20 return virtio_transport_send_pkt_info(vsk, &info); @@ -1513,12 +1523,12 @@ virtio_transport_recv_listen(struct sock *sk, struc= t sk_buff *skb, int ret; =20 if (le16_to_cpu(hdr->op) !=3D VIRTIO_VSOCK_OP_REQUEST) { - virtio_transport_reset_no_sock(t, skb); + virtio_transport_reset_no_sock(t, skb, sock_net(sk)); return -EINVAL; } =20 if (sk_acceptq_is_full(sk)) { - virtio_transport_reset_no_sock(t, skb); + virtio_transport_reset_no_sock(t, skb, sock_net(sk)); return -ENOMEM; } =20 @@ -1526,13 +1536,13 @@ virtio_transport_recv_listen(struct sock *sk, struc= t sk_buff *skb, * Subsequent enqueues would lead to a memory leak. */ if (sk->sk_shutdown =3D=3D SHUTDOWN_MASK) { - virtio_transport_reset_no_sock(t, skb); + virtio_transport_reset_no_sock(t, skb, sock_net(sk)); return -ESHUTDOWN; } =20 child =3D vsock_create_connected(sk); if (!child) { - virtio_transport_reset_no_sock(t, skb); + virtio_transport_reset_no_sock(t, skb, sock_net(sk)); return -ENOMEM; } =20 @@ -1554,7 +1564,7 @@ virtio_transport_recv_listen(struct sock *sk, struct = sk_buff *skb, */ if (ret || vchild->transport !=3D &t->transport) { release_sock(child); - virtio_transport_reset_no_sock(t, skb); + virtio_transport_reset_no_sock(t, skb, sock_net(sk)); sock_put(child); return ret; } @@ -1582,7 +1592,7 @@ static bool virtio_transport_valid_type(u16 type) * lock. */ void virtio_transport_recv_pkt(struct virtio_transport *t, - struct sk_buff *skb) + struct sk_buff *skb, struct net *net) { struct virtio_vsock_hdr *hdr =3D virtio_vsock_hdr(skb); struct sockaddr_vm src, dst; @@ -1605,24 +1615,24 @@ void virtio_transport_recv_pkt(struct virtio_transp= ort *t, le32_to_cpu(hdr->fwd_cnt)); =20 if (!virtio_transport_valid_type(le16_to_cpu(hdr->type))) { - (void)virtio_transport_reset_no_sock(t, skb); + (void)virtio_transport_reset_no_sock(t, skb, net); goto free_pkt; } =20 /* The socket must be in connected or bound table * otherwise send reset back */ - sk =3D vsock_find_connected_socket(&src, &dst); + sk =3D vsock_find_connected_socket_net(&src, &dst, net); if (!sk) { - sk =3D vsock_find_bound_socket(&dst); + sk =3D vsock_find_bound_socket_net(&dst, net); if (!sk) { - (void)virtio_transport_reset_no_sock(t, skb); + (void)virtio_transport_reset_no_sock(t, skb, net); goto free_pkt; } } =20 if (virtio_transport_get_type(sk) !=3D le16_to_cpu(hdr->type)) { - (void)virtio_transport_reset_no_sock(t, skb); + (void)virtio_transport_reset_no_sock(t, skb, net); sock_put(sk); goto free_pkt; } @@ -1641,7 +1651,7 @@ void virtio_transport_recv_pkt(struct virtio_transpor= t *t, */ if (sock_flag(sk, SOCK_DONE) || (sk->sk_state !=3D TCP_LISTEN && vsk->transport !=3D &t->transport)) { - (void)virtio_transport_reset_no_sock(t, skb); + (void)virtio_transport_reset_no_sock(t, skb, net); release_sock(sk); sock_put(sk); goto free_pkt; @@ -1673,7 +1683,7 @@ void virtio_transport_recv_pkt(struct virtio_transpor= t *t, kfree_skb(skb); break; default: - (void)virtio_transport_reset_no_sock(t, skb); + (void)virtio_transport_reset_no_sock(t, skb, net); kfree_skb(skb); break; } diff --git a/net/vmw_vsock/vsock_loopback.c b/net/vmw_vsock/vsock_loopback.c index 378a96dcb666..dbd4d81e0acb 100644 --- a/net/vmw_vsock/vsock_loopback.c +++ b/net/vmw_vsock/vsock_loopback.c @@ -26,7 +26,7 @@ static u32 vsock_loopback_get_local_cid(void) return VMADDR_CID_LOCAL; } =20 -static int vsock_loopback_send_pkt(struct sk_buff *skb) +static int vsock_loopback_send_pkt(struct sk_buff *skb, struct net *net) { struct vsock_loopback *vsock =3D &the_vsock_loopback; int len =3D skb->len; @@ -48,6 +48,13 @@ static int vsock_loopback_cancel_pkt(struct vsock_sock *= vsk) =20 static bool vsock_loopback_seqpacket_allow(struct vsock_sock *vsk, u32 remote_cid); + +static bool vsock_loopback_stream_allow(struct vsock_sock *vsk, u32 cid, + u32 port) +{ + return true; +} + static bool vsock_loopback_msgzerocopy_allow(void) { return true; @@ -77,7 +84,7 @@ static struct virtio_transport loopback_transport =3D { .stream_has_space =3D virtio_transport_stream_has_space, .stream_rcvhiwat =3D virtio_transport_stream_rcvhiwat, .stream_is_active =3D virtio_transport_stream_is_active, - .stream_allow =3D virtio_transport_stream_allow, + .stream_allow =3D vsock_loopback_stream_allow, =20 .seqpacket_dequeue =3D virtio_transport_seqpacket_dequeue, .seqpacket_enqueue =3D virtio_transport_seqpacket_enqueue, @@ -132,7 +139,8 @@ static void vsock_loopback_work(struct work_struct *wor= k) */ virtio_transport_consume_skb_sent(skb, false); virtio_transport_deliver_tap_pkt(skb); - virtio_transport_recv_pkt(&loopback_transport, skb); + virtio_transport_recv_pkt(&loopback_transport, skb, + sock_net(skb->sk)); } } =20 --=20 2.47.3