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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 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, Sargun Dhillon , Bobby Eshleman , berrange@redhat.com, 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. Signed-off-by: Bobby Eshleman --- Changes in v10: - Splitting patches complicates the series with meaningless placeholder val= ues 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 | 45 +++++++++++++++++------ include/linux/virtio_vsock.h | 8 +++-- net/vmw_vsock/virtio_transport.c | 10 ++++-- net/vmw_vsock/virtio_transport_common.c | 63 ++++++++++++++++++++++++-----= ---- net/vmw_vsock/vsock_loopback.c | 8 +++-- 5 files changed, 102 insertions(+), 32 deletions(-) diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c index c8319cd1c232..2846076d484f 100644 --- a/drivers/vhost/vsock.c +++ b/drivers/vhost/vsock.c @@ -46,6 +46,11 @@ 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; + + /* The ns mode at the time vhost_vsock was created */ + enum vsock_net_mode net_mode; =20 /* Link to global vhost_vsock_hash, writes use vhost_vsock_mutex */ struct hlist_node hash; @@ -72,7 +77,8 @@ static bool vhost_transport_supports_local_mode(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, + enum vsock_net_mode mode) { struct vhost_vsock *vsock; =20 @@ -83,9 +89,10 @@ 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, mode, vsock->net, + vsock->net_mode)) return vsock; - } =20 return NULL; @@ -274,7 +281,8 @@ 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, + enum vsock_net_mode net_mode) { struct virtio_vsock_hdr *hdr =3D virtio_vsock_hdr(skb); struct vhost_vsock *vsock; @@ -283,7 +291,7 @@ 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, net_mode); if (!vsock) { rcu_read_unlock(); kfree_skb(skb); @@ -310,7 +318,8 @@ 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)), vsk->net_mode); if (!vsock) goto out; =20 @@ -470,11 +479,12 @@ 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 rcu_read_lock(); - vsock =3D vhost_vsock_get(remote_cid); + vsock =3D vhost_vsock_get(remote_cid, net, vsk->net_mode); =20 if (vsock) seqpacket_allow =3D vsock->seqpacket_allow; @@ -545,7 +555,8 @@ 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, vsock->net_mode); else kfree_skb(skb); =20 @@ -662,6 +673,7 @@ 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 @@ -677,6 +689,17 @@ static int vhost_vsock_dev_open(struct inode *inode, s= truct file *file) goto out; } =20 + net =3D current->nsproxy->net_ns; + vsock->net =3D get_net_track(net, &vsock->ns_tracker, GFP_KERNEL); + + /* Store the mode of the namespace at the time of creation. If this + * namespace later changes from "global" to "local", we want this vsock + * to continue operating normally and not suddenly break. For that + * reason, we save the mode here and later use it when performing + * socket lookups with vsock_net_check_mode() (see vhost_vsock_get()). + */ + vsock->net_mode =3D vsock_net_mode(net); + vsock->guest_cid =3D 0; /* no CID assigned yet */ vsock->seqpacket_allow =3D false; =20 @@ -716,7 +739,8 @@ 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), + vsk->net_mode)) return; =20 /* If the close timeout is pending, let it expire. This avoids races @@ -761,6 +785,7 @@ 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; @@ -787,7 +812,7 @@ 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, vsock->net_mode); 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 0c67543a45c8..5ed6136a4ed4 100644 --- a/include/linux/virtio_vsock.h +++ b/include/linux/virtio_vsock.h @@ -173,6 +173,8 @@ struct virtio_vsock_pkt_info { u32 remote_cid, remote_port; struct vsock_sock *vsk; struct msghdr *msg; + struct net *net; + enum vsock_net_mode net_mode; u32 pkt_len; u16 type; u16 op; @@ -185,7 +187,8 @@ 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, + enum vsock_net_mode net_mode); =20 /* Used in MSG_ZEROCOPY mode. Checks, that provided data * (number of buffers) could be transmitted with zerocopy @@ -280,7 +283,8 @@ 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, + enum vsock_net_mode net_mode); 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 e585cb66c6f5..bc266bdb7faa 100644 --- a/net/vmw_vsock/virtio_transport.c +++ b/net/vmw_vsock/virtio_transport.c @@ -243,7 +243,8 @@ 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, + enum vsock_net_mode net_mode) { struct virtio_vsock_hdr *hdr; struct virtio_vsock *vsock; @@ -675,7 +676,12 @@ 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, VSOCK_NET_MODE_GLOBAL); } } 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 dcc8a1d5851e..168e7517a3f0 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, info->net_mode); if (ret < 0) break; =20 @@ -527,6 +527,8 @@ 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)), + .net_mode =3D vsk->net_mode, }; =20 return virtio_transport_send_pkt_info(vsk, &info); @@ -1067,6 +1069,8 @@ 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)), + .net_mode =3D vsk->net_mode, }; =20 return virtio_transport_send_pkt_info(vsk, &info); @@ -1082,6 +1086,8 @@ 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)), + .net_mode =3D vsk->net_mode, }; =20 return virtio_transport_send_pkt_info(vsk, &info); @@ -1108,6 +1114,8 @@ 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)), + .net_mode =3D vsk->net_mode, }; =20 return virtio_transport_send_pkt_info(vsk, &info); @@ -1145,6 +1153,8 @@ 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)), + .net_mode =3D vsk->net_mode, }; =20 /* Send RST only if the original pkt is not a RST pkt */ @@ -1156,15 +1166,27 @@ 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 and net_mode refer to the namespace of whoever sent the invalid mes= sage. + * For loopback, this is the namespace of the socket. For vhost, this is t= he + * 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, + enum vsock_net_mode net_mode) { struct virtio_vsock_hdr *hdr =3D virtio_vsock_hdr(skb); struct virtio_vsock_pkt_info info =3D { .op =3D VIRTIO_VSOCK_OP_RST, .type =3D le16_to_cpu(hdr->type), .reply =3D true, + + /* net or net_mode are not defined here because we pass + * net and net_mode directly to t->send_pkt(), instead of + * relying on virtio_transport_send_pkt_info() to pass them to + * t->send_pkt(). They are not needed by + * virtio_transport_alloc_skb(). + */ }; struct sk_buff *reply; =20 @@ -1183,7 +1205,7 @@ 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, net_mode); } =20 /* This function should be called with sk_lock held and SOCK_DONE set */ @@ -1465,6 +1487,8 @@ 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)), + .net_mode =3D vsk->net_mode, }; =20 return virtio_transport_send_pkt_info(vsk, &info); @@ -1507,12 +1531,14 @@ 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), + vsk->net_mode); 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), + vsk->net_mode); return -ENOMEM; } =20 @@ -1520,13 +1546,15 @@ 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), + vsk->net_mode); 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), + vsk->net_mode); return -ENOMEM; } =20 @@ -1548,7 +1576,8 @@ 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), + vsk->net_mode); sock_put(child); return ret; } @@ -1576,7 +1605,8 @@ 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, + enum vsock_net_mode net_mode) { struct virtio_vsock_hdr *hdr =3D virtio_vsock_hdr(skb); struct sockaddr_vm src, dst; @@ -1599,24 +1629,25 @@ 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, net_mode); 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, net_mode); if (!sk) { - sk =3D vsock_find_bound_socket(&dst); + sk =3D vsock_find_bound_socket_net(&dst, net, net_mode); if (!sk) { - (void)virtio_transport_reset_no_sock(t, skb); + (void)virtio_transport_reset_no_sock(t, skb, net, + net_mode); 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, net_mode); sock_put(sk); goto free_pkt; } @@ -1635,7 +1666,7 @@ 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, net_mode); release_sock(sk); sock_put(sk); goto free_pkt; @@ -1667,7 +1698,7 @@ 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, net_mode); kfree_skb(skb); break; } diff --git a/net/vmw_vsock/vsock_loopback.c b/net/vmw_vsock/vsock_loopback.c index 1e25c1a6b43f..a730fa74d2d9 100644 --- a/net/vmw_vsock/vsock_loopback.c +++ b/net/vmw_vsock/vsock_loopback.c @@ -31,7 +31,8 @@ static bool vsock_loopback_supports_local_mode(void) return true; } =20 -static int vsock_loopback_send_pkt(struct sk_buff *skb) +static int vsock_loopback_send_pkt(struct sk_buff *skb, struct net *net, + enum vsock_net_mode net_mode) { struct vsock_loopback *vsock =3D &the_vsock_loopback; int len =3D skb->len; @@ -138,7 +139,10 @@ static void vsock_loopback_work(struct work_struct *wo= rk) */ 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), + vsock_sk(skb->sk)->net_mode); } } =20 --=20 2.47.3