1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun
3*4882a593Smuzhiyun #include <linux/ceph/decode.h>
4*4882a593Smuzhiyun
5*4882a593Smuzhiyun static int
ceph_decode_entity_addr_versioned(void ** p,void * end,struct ceph_entity_addr * addr)6*4882a593Smuzhiyun ceph_decode_entity_addr_versioned(void **p, void *end,
7*4882a593Smuzhiyun struct ceph_entity_addr *addr)
8*4882a593Smuzhiyun {
9*4882a593Smuzhiyun int ret;
10*4882a593Smuzhiyun u8 struct_v;
11*4882a593Smuzhiyun u32 struct_len, addr_len;
12*4882a593Smuzhiyun void *struct_end;
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun ret = ceph_start_decoding(p, end, 1, "entity_addr_t", &struct_v,
15*4882a593Smuzhiyun &struct_len);
16*4882a593Smuzhiyun if (ret)
17*4882a593Smuzhiyun goto bad;
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun ret = -EINVAL;
20*4882a593Smuzhiyun struct_end = *p + struct_len;
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun ceph_decode_copy_safe(p, end, &addr->type, sizeof(addr->type), bad);
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun ceph_decode_copy_safe(p, end, &addr->nonce, sizeof(addr->nonce), bad);
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun ceph_decode_32_safe(p, end, addr_len, bad);
27*4882a593Smuzhiyun if (addr_len > sizeof(addr->in_addr))
28*4882a593Smuzhiyun goto bad;
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun memset(&addr->in_addr, 0, sizeof(addr->in_addr));
31*4882a593Smuzhiyun if (addr_len) {
32*4882a593Smuzhiyun ceph_decode_copy_safe(p, end, &addr->in_addr, addr_len, bad);
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun addr->in_addr.ss_family =
35*4882a593Smuzhiyun le16_to_cpu((__force __le16)addr->in_addr.ss_family);
36*4882a593Smuzhiyun }
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun /* Advance past anything the client doesn't yet understand */
39*4882a593Smuzhiyun *p = struct_end;
40*4882a593Smuzhiyun ret = 0;
41*4882a593Smuzhiyun bad:
42*4882a593Smuzhiyun return ret;
43*4882a593Smuzhiyun }
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun static int
ceph_decode_entity_addr_legacy(void ** p,void * end,struct ceph_entity_addr * addr)46*4882a593Smuzhiyun ceph_decode_entity_addr_legacy(void **p, void *end,
47*4882a593Smuzhiyun struct ceph_entity_addr *addr)
48*4882a593Smuzhiyun {
49*4882a593Smuzhiyun int ret = -EINVAL;
50*4882a593Smuzhiyun
51*4882a593Smuzhiyun /* Skip rest of type field */
52*4882a593Smuzhiyun ceph_decode_skip_n(p, end, 3, bad);
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun /*
55*4882a593Smuzhiyun * Clients that don't support ADDR2 always send TYPE_NONE, change it
56*4882a593Smuzhiyun * to TYPE_LEGACY for forward compatibility.
57*4882a593Smuzhiyun */
58*4882a593Smuzhiyun addr->type = CEPH_ENTITY_ADDR_TYPE_LEGACY;
59*4882a593Smuzhiyun ceph_decode_copy_safe(p, end, &addr->nonce, sizeof(addr->nonce), bad);
60*4882a593Smuzhiyun memset(&addr->in_addr, 0, sizeof(addr->in_addr));
61*4882a593Smuzhiyun ceph_decode_copy_safe(p, end, &addr->in_addr,
62*4882a593Smuzhiyun sizeof(addr->in_addr), bad);
63*4882a593Smuzhiyun addr->in_addr.ss_family =
64*4882a593Smuzhiyun be16_to_cpu((__force __be16)addr->in_addr.ss_family);
65*4882a593Smuzhiyun ret = 0;
66*4882a593Smuzhiyun bad:
67*4882a593Smuzhiyun return ret;
68*4882a593Smuzhiyun }
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun int
ceph_decode_entity_addr(void ** p,void * end,struct ceph_entity_addr * addr)71*4882a593Smuzhiyun ceph_decode_entity_addr(void **p, void *end, struct ceph_entity_addr *addr)
72*4882a593Smuzhiyun {
73*4882a593Smuzhiyun u8 marker;
74*4882a593Smuzhiyun
75*4882a593Smuzhiyun ceph_decode_8_safe(p, end, marker, bad);
76*4882a593Smuzhiyun if (marker == 1)
77*4882a593Smuzhiyun return ceph_decode_entity_addr_versioned(p, end, addr);
78*4882a593Smuzhiyun else if (marker == 0)
79*4882a593Smuzhiyun return ceph_decode_entity_addr_legacy(p, end, addr);
80*4882a593Smuzhiyun bad:
81*4882a593Smuzhiyun return -EINVAL;
82*4882a593Smuzhiyun }
83*4882a593Smuzhiyun EXPORT_SYMBOL(ceph_decode_entity_addr);
84*4882a593Smuzhiyun
85