1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * VMware vSockets Driver
4  *
5  * Copyright (C) 2007-2012 VMware, Inc. All rights reserved.
6  */
7 
8 #include <linux/types.h>
9 #include <linux/socket.h>
10 #include <linux/stddef.h>
11 #include <net/sock.h>
12 #include <net/vsock_addr.h>
13 
vsock_addr_init(struct sockaddr_vm * addr,u32 cid,u32 port)14 void vsock_addr_init(struct sockaddr_vm *addr, u32 cid, u32 port)
15 {
16 	memset(addr, 0, sizeof(*addr));
17 	addr->svm_family = AF_VSOCK;
18 	addr->svm_cid = cid;
19 	addr->svm_port = port;
20 }
21 EXPORT_SYMBOL_GPL(vsock_addr_init);
22 
vsock_addr_validate(const struct sockaddr_vm * addr)23 int vsock_addr_validate(const struct sockaddr_vm *addr)
24 {
25 	__u8 svm_valid_flags = VMADDR_FLAG_TO_HOST;
26 
27 	if (!addr)
28 		return -EFAULT;
29 
30 	if (addr->svm_family != AF_VSOCK)
31 		return -EAFNOSUPPORT;
32 
33 	if (addr->svm_flags & ~svm_valid_flags)
34 		return -EINVAL;
35 
36 	return 0;
37 }
38 EXPORT_SYMBOL_GPL(vsock_addr_validate);
39 
vsock_addr_bound(const struct sockaddr_vm * addr)40 bool vsock_addr_bound(const struct sockaddr_vm *addr)
41 {
42 	return addr->svm_port != VMADDR_PORT_ANY;
43 }
44 EXPORT_SYMBOL_GPL(vsock_addr_bound);
45 
vsock_addr_unbind(struct sockaddr_vm * addr)46 void vsock_addr_unbind(struct sockaddr_vm *addr)
47 {
48 	vsock_addr_init(addr, VMADDR_CID_ANY, VMADDR_PORT_ANY);
49 }
50 EXPORT_SYMBOL_GPL(vsock_addr_unbind);
51 
vsock_addr_equals_addr(const struct sockaddr_vm * addr,const struct sockaddr_vm * other)52 bool vsock_addr_equals_addr(const struct sockaddr_vm *addr,
53 			    const struct sockaddr_vm *other)
54 {
55 	return addr->svm_cid == other->svm_cid &&
56 		addr->svm_port == other->svm_port;
57 }
58 EXPORT_SYMBOL_GPL(vsock_addr_equals_addr);
59 
vsock_addr_cast(const struct sockaddr * addr,size_t len,struct sockaddr_vm ** out_addr)60 int vsock_addr_cast(const struct sockaddr *addr,
61 		    size_t len, struct sockaddr_vm **out_addr)
62 {
63 	if (len < sizeof(**out_addr))
64 		return -EFAULT;
65 
66 	*out_addr = (struct sockaddr_vm *)addr;
67 	return vsock_addr_validate(*out_addr);
68 }
69 EXPORT_SYMBOL_GPL(vsock_addr_cast);
70