#include <linux/kernel.h>
#include <linux/workqueue.h>
+#include <net/netns/vsock.h>
#include <net/sock.h>
#include <uapi/linux/vm_sockets.h>
size_t len, int flags);
int (*dgram_enqueue)(struct vsock_sock *, struct sockaddr_vm *,
struct msghdr *, size_t len);
- bool (*dgram_allow)(u32 cid, u32 port);
+ bool (*dgram_allow)(struct vsock_sock *vsk, u32 cid, u32 port);
/* STREAM. */
/* TODO: stream_bind() */
s64 (*stream_has_space)(struct vsock_sock *);
u64 (*stream_rcvhiwat)(struct vsock_sock *);
bool (*stream_is_active)(struct vsock_sock *);
- bool (*stream_allow)(u32 cid, u32 port);
+ bool (*stream_allow)(struct vsock_sock *vsk, u32 cid, u32 port);
/* SEQ_PACKET. */
ssize_t (*seqpacket_dequeue)(struct vsock_sock *vsk, struct msghdr *msg,
int flags);
int (*seqpacket_enqueue)(struct vsock_sock *vsk, struct msghdr *msg,
size_t len);
- bool (*seqpacket_allow)(u32 remote_cid);
+ bool (*seqpacket_allow)(struct vsock_sock *vsk, u32 remote_cid);
u32 (*seqpacket_has_data)(struct vsock_sock *vsk);
/* Notification. */
struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr);
struct sock *vsock_find_connected_socket(struct sockaddr_vm *src,
struct sockaddr_vm *dst);
+struct sock *vsock_find_bound_socket_net(struct sockaddr_vm *addr,
+ struct net *net);
+struct sock *vsock_find_connected_socket_net(struct sockaddr_vm *src,
+ struct sockaddr_vm *dst,
+ struct net *net);
void vsock_remove_sock(struct vsock_sock *vsk);
void vsock_for_each_connected_socket(struct vsock_transport *transport,
void (*fn)(struct sock *sk));
{
return t->msgzerocopy_allow && t->msgzerocopy_allow();
}
+
+static inline enum vsock_net_mode vsock_net_mode(struct net *net)
+{
+ if (!net)
+ return VSOCK_NET_MODE_GLOBAL;
+
+ return READ_ONCE(net->vsock.mode);
+}
+
+static inline bool vsock_net_mode_global(struct vsock_sock *vsk)
+{
+ return vsock_net_mode(sock_net(sk_vsock(vsk))) == VSOCK_NET_MODE_GLOBAL;
+}
+
+static inline void vsock_net_set_child_mode(struct net *net,
+ enum vsock_net_mode mode)
+{
+ WRITE_ONCE(net->vsock.child_ns_mode, mode);
+}
+
+static inline enum vsock_net_mode vsock_net_child_mode(struct net *net)
+{
+ return READ_ONCE(net->vsock.child_ns_mode);
+}
+
+/* Return true if two namespaces pass the mode rules. Otherwise, return false.
+ *
+ * A NULL namespace is treated as VSOCK_NET_MODE_GLOBAL.
+ *
+ * Read more about modes in the comment header of net/vmw_vsock/af_vsock.c.
+ */
+static inline bool vsock_net_check_mode(struct net *ns0, struct net *ns1)
+{
+ enum vsock_net_mode mode0, mode1;
+
+ /* Any vsocks within the same network namespace are always reachable,
+ * regardless of the mode.
+ */
+ if (net_eq(ns0, ns1))
+ return true;
+
+ mode0 = vsock_net_mode(ns0);
+ mode1 = vsock_net_mode(ns1);
+
+ /* Different namespaces are only reachable if they are both
+ * global mode.
+ */
+ return mode0 == VSOCK_NET_MODE_GLOBAL && mode0 == mode1;
+}
#endif /* __AF_VSOCK_H__ */
* TCP_ESTABLISHED - connected
* TCP_CLOSING - disconnecting
* TCP_LISTEN - listening
+ *
+ * - Namespaces in vsock support two different modes: "local" and "global".
+ * Each mode defines how the namespace interacts with CIDs.
+ * Each namespace exposes two sysctl files:
+ *
+ * - /proc/sys/net/vsock/ns_mode (read-only) reports the current namespace's
+ * mode, which is set at namespace creation and immutable thereafter.
+ * - /proc/sys/net/vsock/child_ns_mode (writable) controls what mode future
+ * child namespaces will inherit when created. The default is "global".
+ *
+ * Changing child_ns_mode only affects newly created namespaces, not the
+ * current namespace or existing children. At namespace creation, ns_mode
+ * is inherited from the parent's child_ns_mode.
+ *
+ * The init_net mode is "global" and cannot be modified.
+ *
+ * The modes affect the allocation and accessibility of CIDs as follows:
+ *
+ * - global - access and allocation are all system-wide
+ * - all CID allocation from global namespaces draw from the same
+ * system-wide pool.
+ * - if one global namespace has already allocated some CID, another
+ * global namespace will not be able to allocate the same CID.
+ * - global mode AF_VSOCK sockets can reach any VM or socket in any global
+ * namespace, they are not contained to only their own namespace.
+ * - AF_VSOCK sockets in a global mode namespace cannot reach VMs or
+ * sockets in any local mode namespace.
+ * - local - access and allocation are contained within the namespace
+ * - CID allocation draws only from a private pool local only to the
+ * namespace, and does not affect the CIDs available for allocation in any
+ * other namespace (global or local).
+ * - VMs in a local namespace do not collide with CIDs in any other local
+ * namespace or any global namespace. For example, if a VM in a local mode
+ * namespace is given CID 10, then CID 10 is still available for
+ * allocation in any other namespace, but not in the same namespace.
+ * - AF_VSOCK sockets in a local mode namespace can connect only to VMs or
+ * other sockets within their own namespace.
+ * - sockets bound to VMADDR_CID_ANY in local namespaces will never resolve
+ * to any transport that is not compatible with local mode. There is no
+ * error that propagates to the user (as there is for connection attempts)
+ * because it is possible for some packet to reach this socket from
+ * a different transport that *does* support local mode. For
+ * example, virtio-vsock may not support local mode, but the socket
+ * may still accept a connection from vhost-vsock which does.
*/
#include <linux/compat.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/net.h>
+#include <linux/proc_fs.h>
#include <linux/poll.h>
#include <linux/random.h>
#include <linux/skbuff.h>
#include <linux/smp.h>
#include <linux/socket.h>
#include <linux/stddef.h>
+#include <linux/sysctl.h>
#include <linux/unistd.h>
#include <linux/wait.h>
#include <linux/workqueue.h>
#include <net/sock.h>
#include <net/af_vsock.h>
+#include <net/netns/vsock.h>
#include <uapi/linux/vm_sockets.h>
#include <uapi/asm-generic/ioctls.h>
+#define VSOCK_NET_MODE_STR_GLOBAL "global"
+#define VSOCK_NET_MODE_STR_LOCAL "local"
+
+/* 6 chars for "global", 1 for null-terminator, and 1 more for '\n'.
+ * The newline is added by proc_dostring() for read operations.
+ */
+#define VSOCK_NET_MODE_STR_MAX 8
+
static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr);
static void vsock_sk_destruct(struct sock *sk);
static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb);
sock_put(&vsk->sk);
}
-static struct sock *__vsock_find_bound_socket(struct sockaddr_vm *addr)
+static struct sock *__vsock_find_bound_socket_net(struct sockaddr_vm *addr,
+ struct net *net)
{
struct vsock_sock *vsk;
list_for_each_entry(vsk, vsock_bound_sockets(addr), bound_table) {
- if (vsock_addr_equals_addr(addr, &vsk->local_addr))
- return sk_vsock(vsk);
+ struct sock *sk = sk_vsock(vsk);
+
+ if (vsock_addr_equals_addr(addr, &vsk->local_addr) &&
+ vsock_net_check_mode(sock_net(sk), net))
+ return sk;
if (addr->svm_port == vsk->local_addr.svm_port &&
(vsk->local_addr.svm_cid == VMADDR_CID_ANY ||
- addr->svm_cid == VMADDR_CID_ANY))
- return sk_vsock(vsk);
+ addr->svm_cid == VMADDR_CID_ANY) &&
+ vsock_net_check_mode(sock_net(sk), net))
+ return sk;
}
return NULL;
}
-static struct sock *__vsock_find_connected_socket(struct sockaddr_vm *src,
- struct sockaddr_vm *dst)
+static struct sock *
+__vsock_find_connected_socket_net(struct sockaddr_vm *src,
+ struct sockaddr_vm *dst, struct net *net)
{
struct vsock_sock *vsk;
list_for_each_entry(vsk, vsock_connected_sockets(src, dst),
connected_table) {
+ struct sock *sk = sk_vsock(vsk);
+
if (vsock_addr_equals_addr(src, &vsk->remote_addr) &&
- dst->svm_port == vsk->local_addr.svm_port) {
- return sk_vsock(vsk);
+ dst->svm_port == vsk->local_addr.svm_port &&
+ vsock_net_check_mode(sock_net(sk), net)) {
+ return sk;
}
}
}
EXPORT_SYMBOL_GPL(vsock_remove_connected);
-struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr)
+/* Find a bound socket, filtering by namespace and namespace mode.
+ *
+ * Use this in transports that are namespace-aware and can provide the
+ * network namespace context.
+ */
+struct sock *vsock_find_bound_socket_net(struct sockaddr_vm *addr,
+ struct net *net)
{
struct sock *sk;
spin_lock_bh(&vsock_table_lock);
- sk = __vsock_find_bound_socket(addr);
+ sk = __vsock_find_bound_socket_net(addr, net);
if (sk)
sock_hold(sk);
return sk;
}
+EXPORT_SYMBOL_GPL(vsock_find_bound_socket_net);
+
+/* Find a bound socket without namespace filtering.
+ *
+ * Use this in transports that lack namespace context. All sockets are
+ * treated as if in global mode.
+ */
+struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr)
+{
+ return vsock_find_bound_socket_net(addr, NULL);
+}
EXPORT_SYMBOL_GPL(vsock_find_bound_socket);
-struct sock *vsock_find_connected_socket(struct sockaddr_vm *src,
- struct sockaddr_vm *dst)
+/* Find a connected socket, filtering by namespace and namespace mode.
+ *
+ * Use this in transports that are namespace-aware and can provide the
+ * network namespace context.
+ */
+struct sock *vsock_find_connected_socket_net(struct sockaddr_vm *src,
+ struct sockaddr_vm *dst,
+ struct net *net)
{
struct sock *sk;
spin_lock_bh(&vsock_table_lock);
- sk = __vsock_find_connected_socket(src, dst);
+ sk = __vsock_find_connected_socket_net(src, dst, net);
if (sk)
sock_hold(sk);
return sk;
}
+EXPORT_SYMBOL_GPL(vsock_find_connected_socket_net);
+
+/* Find a connected socket without namespace filtering.
+ *
+ * Use this in transports that lack namespace context. All sockets are
+ * treated as if in global mode.
+ */
+struct sock *vsock_find_connected_socket(struct sockaddr_vm *src,
+ struct sockaddr_vm *dst)
+{
+ return vsock_find_connected_socket_net(src, dst, NULL);
+}
EXPORT_SYMBOL_GPL(vsock_find_connected_socket);
void vsock_remove_sock(struct vsock_sock *vsk)
if (sk->sk_type == SOCK_SEQPACKET) {
if (!new_transport->seqpacket_allow ||
- !new_transport->seqpacket_allow(remote_cid)) {
+ !new_transport->seqpacket_allow(vsk, remote_cid)) {
module_put(new_transport->module);
return -ESOCKTNOSUPPORT;
}
static int __vsock_bind_connectible(struct vsock_sock *vsk,
struct sockaddr_vm *addr)
{
- static u32 port;
+ struct net *net = sock_net(sk_vsock(vsk));
struct sockaddr_vm new_addr;
- if (!port)
- port = get_random_u32_above(LAST_RESERVED_PORT);
+ if (!net->vsock.port)
+ net->vsock.port = get_random_u32_above(LAST_RESERVED_PORT);
vsock_addr_init(&new_addr, addr->svm_cid, addr->svm_port);
unsigned int i;
for (i = 0; i < MAX_PORT_RETRIES; i++) {
- if (port == VMADDR_PORT_ANY ||
- port <= LAST_RESERVED_PORT)
- port = LAST_RESERVED_PORT + 1;
+ if (net->vsock.port == VMADDR_PORT_ANY ||
+ net->vsock.port <= LAST_RESERVED_PORT)
+ net->vsock.port = LAST_RESERVED_PORT + 1;
- new_addr.svm_port = port++;
+ new_addr.svm_port = net->vsock.port++;
- if (!__vsock_find_bound_socket(&new_addr)) {
+ if (!__vsock_find_bound_socket_net(&new_addr, net)) {
found = true;
break;
}
return -EACCES;
}
- if (__vsock_find_bound_socket(&new_addr))
+ if (__vsock_find_bound_socket_net(&new_addr, net))
return -EADDRINUSE;
}
goto out;
}
- if (!transport->dgram_allow(remote_addr->svm_cid,
+ if (!transport->dgram_allow(vsk, remote_addr->svm_cid,
remote_addr->svm_port)) {
err = -EINVAL;
goto out;
if (err)
goto out;
- if (!vsk->transport->dgram_allow(remote_addr->svm_cid,
+ if (!vsk->transport->dgram_allow(vsk, remote_addr->svm_cid,
remote_addr->svm_port)) {
err = -EINVAL;
goto out;
* endpoints.
*/
if (!transport ||
- !transport->stream_allow(remote_addr->svm_cid,
+ !transport->stream_allow(vsk, remote_addr->svm_cid,
remote_addr->svm_port)) {
err = -ENETUNREACH;
goto out;
.fops = &vsock_device_ops,
};
+static int __vsock_net_mode_string(const struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos,
+ enum vsock_net_mode mode,
+ enum vsock_net_mode *new_mode)
+{
+ char data[VSOCK_NET_MODE_STR_MAX] = {0};
+ struct ctl_table tmp;
+ int ret;
+
+ if (!table->data || !table->maxlen || !*lenp) {
+ *lenp = 0;
+ return 0;
+ }
+
+ tmp = *table;
+ tmp.data = data;
+
+ if (!write) {
+ const char *p;
+
+ switch (mode) {
+ case VSOCK_NET_MODE_GLOBAL:
+ p = VSOCK_NET_MODE_STR_GLOBAL;
+ break;
+ case VSOCK_NET_MODE_LOCAL:
+ p = VSOCK_NET_MODE_STR_LOCAL;
+ break;
+ default:
+ WARN_ONCE(true, "netns has invalid vsock mode");
+ *lenp = 0;
+ return 0;
+ }
+
+ strscpy(data, p, sizeof(data));
+ tmp.maxlen = strlen(p);
+ }
+
+ ret = proc_dostring(&tmp, write, buffer, lenp, ppos);
+ if (ret || !write)
+ return ret;
+
+ if (*lenp >= sizeof(data))
+ return -EINVAL;
+
+ if (!strncmp(data, VSOCK_NET_MODE_STR_GLOBAL, sizeof(data)))
+ *new_mode = VSOCK_NET_MODE_GLOBAL;
+ else if (!strncmp(data, VSOCK_NET_MODE_STR_LOCAL, sizeof(data)))
+ *new_mode = VSOCK_NET_MODE_LOCAL;
+ else
+ return -EINVAL;
+
+ return 0;
+}
+
+static int vsock_net_mode_string(const struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ struct net *net;
+
+ if (write)
+ return -EPERM;
+
+ net = current->nsproxy->net_ns;
+
+ return __vsock_net_mode_string(table, write, buffer, lenp, ppos,
+ vsock_net_mode(net), NULL);
+}
+
+static int vsock_net_child_mode_string(const struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ enum vsock_net_mode new_mode;
+ struct net *net;
+ int ret;
+
+ net = current->nsproxy->net_ns;
+
+ ret = __vsock_net_mode_string(table, write, buffer, lenp, ppos,
+ vsock_net_child_mode(net), &new_mode);
+ if (ret)
+ return ret;
+
+ if (write)
+ vsock_net_set_child_mode(net, new_mode);
+
+ return 0;
+}
+
+static struct ctl_table vsock_table[] = {
+ {
+ .procname = "ns_mode",
+ .data = &init_net.vsock.mode,
+ .maxlen = VSOCK_NET_MODE_STR_MAX,
+ .mode = 0444,
+ .proc_handler = vsock_net_mode_string
+ },
+ {
+ .procname = "child_ns_mode",
+ .data = &init_net.vsock.child_ns_mode,
+ .maxlen = VSOCK_NET_MODE_STR_MAX,
+ .mode = 0644,
+ .proc_handler = vsock_net_child_mode_string
+ },
+};
+
+static int __net_init vsock_sysctl_register(struct net *net)
+{
+ struct ctl_table *table;
+
+ if (net_eq(net, &init_net)) {
+ table = vsock_table;
+ } else {
+ table = kmemdup(vsock_table, sizeof(vsock_table), GFP_KERNEL);
+ if (!table)
+ goto err_alloc;
+
+ table[0].data = &net->vsock.mode;
+ table[1].data = &net->vsock.child_ns_mode;
+ }
+
+ net->vsock.sysctl_hdr = register_net_sysctl_sz(net, "net/vsock", table,
+ ARRAY_SIZE(vsock_table));
+ if (!net->vsock.sysctl_hdr)
+ goto err_reg;
+
+ return 0;
+
+err_reg:
+ if (!net_eq(net, &init_net))
+ kfree(table);
+err_alloc:
+ return -ENOMEM;
+}
+
+static void vsock_sysctl_unregister(struct net *net)
+{
+ const struct ctl_table *table;
+
+ table = net->vsock.sysctl_hdr->ctl_table_arg;
+ unregister_net_sysctl_table(net->vsock.sysctl_hdr);
+ if (!net_eq(net, &init_net))
+ kfree(table);
+}
+
+static void vsock_net_init(struct net *net)
+{
+ if (net_eq(net, &init_net))
+ net->vsock.mode = VSOCK_NET_MODE_GLOBAL;
+ else
+ net->vsock.mode = vsock_net_child_mode(current->nsproxy->net_ns);
+
+ net->vsock.child_ns_mode = VSOCK_NET_MODE_GLOBAL;
+}
+
+static __net_init int vsock_sysctl_init_net(struct net *net)
+{
+ vsock_net_init(net);
+
+ if (vsock_sysctl_register(net))
+ return -ENOMEM;
+
+ return 0;
+}
+
+static __net_exit void vsock_sysctl_exit_net(struct net *net)
+{
+ vsock_sysctl_unregister(net);
+}
+
+static struct pernet_operations vsock_sysctl_ops = {
+ .init = vsock_sysctl_init_net,
+ .exit = vsock_sysctl_exit_net,
+};
+
static int __init vsock_init(void)
{
int err = 0;
goto err_unregister_proto;
}
+ if (register_pernet_subsys(&vsock_sysctl_ops)) {
+ err = -ENOMEM;
+ goto err_unregister_sock;
+ }
+
vsock_bpf_build_proto();
return 0;
+err_unregister_sock:
+ sock_unregister(AF_VSOCK);
err_unregister_proto:
proto_unregister(&vsock_proto);
err_deregister_misc:
misc_deregister(&vsock_device);
sock_unregister(AF_VSOCK);
proto_unregister(&vsock_proto);
+ unregister_pernet_subsys(&vsock_sysctl_ops);
}
const struct vsock_transport *vsock_core_get_transport(struct vsock_sock *vsk)
projects / thirdparty / kernel / linux.git / commitdiff
