1// SPDX-License-Identifier: GPL-2.0
 2
 3#include <linux/ceph/decode.h>
 4
 5static int
 6ceph_decode_entity_addr_versioned(void **p, void *end,
 7				  struct ceph_entity_addr *addr)
 8{
 9	int ret;
10	u8 struct_v;
11	u32 struct_len, addr_len;
12	void *struct_end;
13
14	ret = ceph_start_decoding(p, end, 1, "entity_addr_t", &struct_v,
15				  &struct_len);
16	if (ret)
17		goto bad;
18
19	ret = -EINVAL;
20	struct_end = *p + struct_len;
21
22	ceph_decode_copy_safe(p, end, &addr->type, sizeof(addr->type), bad);
23
24	ceph_decode_copy_safe(p, end, &addr->nonce, sizeof(addr->nonce), bad);
25
26	ceph_decode_32_safe(p, end, addr_len, bad);
27	if (addr_len > sizeof(addr->in_addr))
28		goto bad;
29
30	memset(&addr->in_addr, 0, sizeof(addr->in_addr));
31	if (addr_len) {
32		ceph_decode_copy_safe(p, end, &addr->in_addr, addr_len, bad);
33
34		addr->in_addr.ss_family =
35			le16_to_cpu((__force __le16)addr->in_addr.ss_family);
36	}
37
38	/* Advance past anything the client doesn't yet understand */
39	*p = struct_end;
40	ret = 0;
41bad:
42	return ret;
43}
44
45static int
46ceph_decode_entity_addr_legacy(void **p, void *end,
47			       struct ceph_entity_addr *addr)
48{
49	int ret = -EINVAL;
50
51	/* Skip rest of type field */
52	ceph_decode_skip_n(p, end, 3, bad);
53
54	/*
55	 * Clients that don't support ADDR2 always send TYPE_NONE, change it
56	 * to TYPE_LEGACY for forward compatibility.
57	 */
58	addr->type = CEPH_ENTITY_ADDR_TYPE_LEGACY;
59	ceph_decode_copy_safe(p, end, &addr->nonce, sizeof(addr->nonce), bad);
60	memset(&addr->in_addr, 0, sizeof(addr->in_addr));
61	ceph_decode_copy_safe(p, end, &addr->in_addr,
62			      sizeof(addr->in_addr), bad);
63	addr->in_addr.ss_family =
64			be16_to_cpu((__force __be16)addr->in_addr.ss_family);
65	ret = 0;
66bad:
67	return ret;
68}
69
70int
71ceph_decode_entity_addr(void **p, void *end, struct ceph_entity_addr *addr)
72{
73	u8 marker;
74
75	ceph_decode_8_safe(p, end, marker, bad);
76	if (marker == 1)
77		return ceph_decode_entity_addr_versioned(p, end, addr);
78	else if (marker == 0)
79		return ceph_decode_entity_addr_legacy(p, end, addr);
80bad:
81	return -EINVAL;
82}
83EXPORT_SYMBOL(ceph_decode_entity_addr);
84