1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef CEPH_MSGR_H
3#define CEPH_MSGR_H
4
5/*
6 * Data types for message passing layer used by Ceph.
7 */
8
9#define CEPH_MON_PORT 6789 /* default monitor port */
10
11/*
12 * tcp connection banner. include a protocol version. and adjust
13 * whenever the wire protocol changes. try to keep this string length
14 * constant.
15 */
16#define CEPH_BANNER "ceph v027"
17#define CEPH_BANNER_LEN 9
18#define CEPH_BANNER_MAX_LEN 30
19
20
21/*
22 * messenger V2 connection banner prefix.
23 * The full banner string should have the form: "ceph v2\n<le16>"
24 * the 2 bytes are the length of the remaining banner.
25 */
26#define CEPH_BANNER_V2 "ceph v2\n"
27#define CEPH_BANNER_V2_LEN 8
28#define CEPH_BANNER_V2_PREFIX_LEN (CEPH_BANNER_V2_LEN + sizeof(__le16))
29
30/*
31 * messenger V2 features
32 */
33#define CEPH_MSGR2_INCARNATION_1 (0ull)
34
35#define DEFINE_MSGR2_FEATURE(bit, incarnation, name) \
36 static const uint64_t __maybe_unused CEPH_MSGR2_FEATURE_##name = (1ULL << bit); \
37 static const uint64_t __maybe_unused CEPH_MSGR2_FEATUREMASK_##name = \
38 (1ULL << bit | CEPH_MSGR2_INCARNATION_##incarnation);
39
40#define HAVE_MSGR2_FEATURE(x, name) \
41 (((x) & (CEPH_MSGR2_FEATUREMASK_##name)) == (CEPH_MSGR2_FEATUREMASK_##name))
42
43DEFINE_MSGR2_FEATURE( 0, 1, REVISION_1) // msgr2.1
44
45#define CEPH_MSGR2_SUPPORTED_FEATURES (CEPH_MSGR2_FEATURE_REVISION_1)
46
47#define CEPH_MSGR2_REQUIRED_FEATURES (CEPH_MSGR2_FEATURE_REVISION_1)
48
49
50/*
51 * Rollover-safe type and comparator for 32-bit sequence numbers.
52 * Comparator returns -1, 0, or 1.
53 */
54typedef __u32 ceph_seq_t;
55
56static inline __s32 ceph_seq_cmp(__u32 a, __u32 b)
57{
58 return (__s32)a - (__s32)b;
59}
60
61
62/*
63 * entity_name -- logical name for a process participating in the
64 * network, e.g. 'mds0' or 'osd3'.
65 */
66struct ceph_entity_name {
67 __u8 type; /* CEPH_ENTITY_TYPE_* */
68 __le64 num;
69} __attribute__ ((packed));
70
71#define CEPH_ENTITY_TYPE_MON 0x01
72#define CEPH_ENTITY_TYPE_MDS 0x02
73#define CEPH_ENTITY_TYPE_OSD 0x04
74#define CEPH_ENTITY_TYPE_CLIENT 0x08
75#define CEPH_ENTITY_TYPE_AUTH 0x20
76
77#define CEPH_ENTITY_TYPE_ANY 0xFF
78
79extern const char *ceph_entity_type_name(int type);
80
81/*
82 * entity_addr -- network address
83 */
84struct ceph_entity_addr {
85 __le32 type; /* CEPH_ENTITY_ADDR_TYPE_* */
86 __le32 nonce; /* unique id for process (e.g. pid) */
87 struct sockaddr_storage in_addr;
88} __attribute__ ((packed));
89
90static inline bool ceph_addr_equal_no_type(const struct ceph_entity_addr *lhs,
91 const struct ceph_entity_addr *rhs)
92{
93 return !memcmp(p: &lhs->in_addr, q: &rhs->in_addr, size: sizeof(lhs->in_addr)) &&
94 lhs->nonce == rhs->nonce;
95}
96
97struct ceph_entity_inst {
98 struct ceph_entity_name name;
99 struct ceph_entity_addr addr;
100} __attribute__ ((packed));
101
102
103/* used by message exchange protocol */
104#define CEPH_MSGR_TAG_READY 1 /* server->client: ready for messages */
105#define CEPH_MSGR_TAG_RESETSESSION 2 /* server->client: reset, try again */
106#define CEPH_MSGR_TAG_WAIT 3 /* server->client: wait for racing
107 incoming connection */
108#define CEPH_MSGR_TAG_RETRY_SESSION 4 /* server->client + cseq: try again
109 with higher cseq */
110#define CEPH_MSGR_TAG_RETRY_GLOBAL 5 /* server->client + gseq: try again
111 with higher gseq */
112#define CEPH_MSGR_TAG_CLOSE 6 /* closing pipe */
113#define CEPH_MSGR_TAG_MSG 7 /* message */
114#define CEPH_MSGR_TAG_ACK 8 /* message ack */
115#define CEPH_MSGR_TAG_KEEPALIVE 9 /* just a keepalive byte! */
116#define CEPH_MSGR_TAG_BADPROTOVER 10 /* bad protocol version */
117#define CEPH_MSGR_TAG_BADAUTHORIZER 11 /* bad authorizer */
118#define CEPH_MSGR_TAG_FEATURES 12 /* insufficient features */
119#define CEPH_MSGR_TAG_SEQ 13 /* 64-bit int follows with seen seq number */
120#define CEPH_MSGR_TAG_KEEPALIVE2 14 /* keepalive2 byte + ceph_timespec */
121#define CEPH_MSGR_TAG_KEEPALIVE2_ACK 15 /* keepalive2 reply */
122#define CEPH_MSGR_TAG_CHALLENGE_AUTHORIZER 16 /* cephx v2 doing server challenge */
123
124/*
125 * connection negotiation
126 */
127struct ceph_msg_connect {
128 __le64 features; /* supported feature bits */
129 __le32 host_type; /* CEPH_ENTITY_TYPE_* */
130 __le32 global_seq; /* count connections initiated by this host */
131 __le32 connect_seq; /* count connections initiated in this session */
132 __le32 protocol_version;
133 __le32 authorizer_protocol;
134 __le32 authorizer_len;
135 __u8 flags; /* CEPH_MSG_CONNECT_* */
136} __attribute__ ((packed));
137
138struct ceph_msg_connect_reply {
139 __u8 tag;
140 __le64 features; /* feature bits for this session */
141 __le32 global_seq;
142 __le32 connect_seq;
143 __le32 protocol_version;
144 __le32 authorizer_len;
145 __u8 flags;
146} __attribute__ ((packed));
147
148#define CEPH_MSG_CONNECT_LOSSY 1 /* messages i send may be safely dropped */
149
150
151/*
152 * message header
153 */
154struct ceph_msg_header_old {
155 __le64 seq; /* message seq# for this session */
156 __le64 tid; /* transaction id */
157 __le16 type; /* message type */
158 __le16 priority; /* priority. higher value == higher priority */
159 __le16 version; /* version of message encoding */
160
161 __le32 front_len; /* bytes in main payload */
162 __le32 middle_len;/* bytes in middle payload */
163 __le32 data_len; /* bytes of data payload */
164 __le16 data_off; /* sender: include full offset;
165 receiver: mask against ~PAGE_MASK */
166
167 struct ceph_entity_inst src, orig_src;
168 __le32 reserved;
169 __le32 crc; /* header crc32c */
170} __attribute__ ((packed));
171
172struct ceph_msg_header {
173 __le64 seq; /* message seq# for this session */
174 __le64 tid; /* transaction id */
175 __le16 type; /* message type */
176 __le16 priority; /* priority. higher value == higher priority */
177 __le16 version; /* version of message encoding */
178
179 __le32 front_len; /* bytes in main payload */
180 __le32 middle_len;/* bytes in middle payload */
181 __le32 data_len; /* bytes of data payload */
182 __le16 data_off; /* sender: include full offset;
183 receiver: mask against ~PAGE_MASK */
184
185 struct ceph_entity_name src;
186 __le16 compat_version;
187 __le16 reserved;
188 __le32 crc; /* header crc32c */
189} __attribute__ ((packed));
190
191struct ceph_msg_header2 {
192 __le64 seq; /* message seq# for this session */
193 __le64 tid; /* transaction id */
194 __le16 type; /* message type */
195 __le16 priority; /* priority. higher value == higher priority */
196 __le16 version; /* version of message encoding */
197
198 __le32 data_pre_padding_len;
199 __le16 data_off; /* sender: include full offset;
200 receiver: mask against ~PAGE_MASK */
201
202 __le64 ack_seq;
203 __u8 flags;
204 /* oldest code we think can decode this. unknown if zero. */
205 __le16 compat_version;
206 __le16 reserved;
207} __attribute__ ((packed));
208
209#define CEPH_MSG_PRIO_LOW 64
210#define CEPH_MSG_PRIO_DEFAULT 127
211#define CEPH_MSG_PRIO_HIGH 196
212#define CEPH_MSG_PRIO_HIGHEST 255
213
214/*
215 * follows data payload
216 */
217struct ceph_msg_footer_old {
218 __le32 front_crc, middle_crc, data_crc;
219 __u8 flags;
220} __attribute__ ((packed));
221
222struct ceph_msg_footer {
223 __le32 front_crc, middle_crc, data_crc;
224 // sig holds the 64 bits of the digital signature for the message PLR
225 __le64 sig;
226 __u8 flags;
227} __attribute__ ((packed));
228
229#define CEPH_MSG_FOOTER_COMPLETE (1<<0) /* msg wasn't aborted */
230#define CEPH_MSG_FOOTER_NOCRC (1<<1) /* no data crc */
231#define CEPH_MSG_FOOTER_SIGNED (1<<2) /* msg was signed */
232
233
234#endif
235

source code of linux/include/linux/ceph/msgr.h

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