summaryrefslogtreecommitdiffstats
path: root/kernel/include/linux/ceph/msgr.h
blob: 1c1887206ffa928264acbc1cf63aa3b36717b3b9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
#ifndef CEPH_MSGR_H
#define CEPH_MSGR_H

/*
 * Data types for message passing layer used by Ceph.
 */

#define CEPH_MON_PORT    6789  /* default monitor port */

/*
 * client-side processes will try to bind to ports in this
 * range, simply for the benefit of tools like nmap or wireshark
 * that would like to identify the protocol.
 */
#define CEPH_PORT_FIRST  6789
#define CEPH_PORT_START  6800  /* non-monitors start here */
#define CEPH_PORT_LAST   6900

/*
 * tcp connection banner.  include a protocol version. and adjust
 * whenever the wire protocol changes.  try to keep this string length
 * constant.
 */
#define CEPH_BANNER "ceph v027"
#define CEPH_BANNER_MAX_LEN 30


/*
 * Rollover-safe type and comparator for 32-bit sequence numbers.
 * Comparator returns -1, 0, or 1.
 */
typedef __u32 ceph_seq_t;

static inline __s32 ceph_seq_cmp(__u32 a, __u32 b)
{
       return (__s32)a - (__s32)b;
}


/*
 * entity_name -- logical name for a process participating in the
 * network, e.g. 'mds0' or 'osd3'.
 */
struct ceph_entity_name {
	__u8 type;      /* CEPH_ENTITY_TYPE_* */
	__le64 num;
} __attribute__ ((packed));

#define CEPH_ENTITY_TYPE_MON    0x01
#define CEPH_ENTITY_TYPE_MDS    0x02
#define CEPH_ENTITY_TYPE_OSD    0x04
#define CEPH_ENTITY_TYPE_CLIENT 0x08
#define CEPH_ENTITY_TYPE_AUTH   0x20

#define CEPH_ENTITY_TYPE_ANY    0xFF

extern const char *ceph_entity_type_name(int type);

/*
 * entity_addr -- network address
 */
struct ceph_entity_addr {
	__le32 type;
	__le32 nonce;  /* unique id for process (e.g. pid) */
	struct sockaddr_storage in_addr;
} __attribute__ ((packed));

struct ceph_entity_inst {
	struct ceph_entity_name name;
	struct ceph_entity_addr addr;
} __attribute__ ((packed));


/* used by message exchange protocol */
#define CEPH_MSGR_TAG_READY         1  /* server->client: ready for messages */
#define CEPH_MSGR_TAG_RESETSESSION  2  /* server->client: reset, try again */
#define CEPH_MSGR_TAG_WAIT          3  /* server->client: wait for racing
					  incoming connection */
#define CEPH_MSGR_TAG_RETRY_SESSION 4  /* server->client + cseq: try again
					  with higher cseq */
#define CEPH_MSGR_TAG_RETRY_GLOBAL  5  /* server->client + gseq: try again
					  with higher gseq */
#define CEPH_MSGR_TAG_CLOSE         6  /* closing pipe */
#define CEPH_MSGR_TAG_MSG           7  /* message */
#define CEPH_MSGR_TAG_ACK           8  /* message ack */
#define CEPH_MSGR_TAG_KEEPALIVE     9  /* just a keepalive byte! */
#define CEPH_MSGR_TAG_BADPROTOVER  10  /* bad protocol version */
#define CEPH_MSGR_TAG_BADAUTHORIZER 11 /* bad authorizer */
#define CEPH_MSGR_TAG_FEATURES      12 /* insufficient features */
#define CEPH_MSGR_TAG_SEQ           13 /* 64-bit int follows with seen seq number */


/*
 * connection negotiation
 */
struct ceph_msg_connect {
	__le64 features;     /* supported feature bits */
	__le32 host_type;    /* CEPH_ENTITY_TYPE_* */
	__le32 global_seq;   /* count connections initiated by this host */
	__le32 connect_seq;  /* count connections initiated in this session */
	__le32 protocol_version;
	__le32 authorizer_protocol;
	__le32 authorizer_len;
	__u8  flags;         /* CEPH_MSG_CONNECT_* */
} __attribute__ ((packed));

struct ceph_msg_connect_reply {
	__u8 tag;
	__le64 features;     /* feature bits for this session */
	__le32 global_seq;
	__le32 connect_seq;
	__le32 protocol_version;
	__le32 authorizer_len;
	__u8 flags;
} __attribute__ ((packed));

#define CEPH_MSG_CONNECT_LOSSY  1  /* messages i send may be safely dropped */


/*
 * message header
 */
struct ceph_msg_header_old {
	__le64 seq;       /* message seq# for this session */
	__le64 tid;       /* transaction id */
	__le16 type;      /* message type */
	__le16 priority;  /* priority.  higher value == higher priority */
	__le16 version;   /* version of message encoding */

	__le32 front_len; /* bytes in main payload */
	__le32 middle_len;/* bytes in middle payload */
	__le32 data_len;  /* bytes of data payload */
	__le16 data_off;  /* sender: include full offset;
			     receiver: mask against ~PAGE_MASK */

	struct ceph_entity_inst src, orig_src;
	__le32 reserved;
	__le32 crc;       /* header crc32c */
} __attribute__ ((packed));

struct ceph_msg_header {
	__le64 seq;       /* message seq# for this session */
	__le64 tid;       /* transaction id */
	__le16 type;      /* message type */
	__le16 priority;  /* priority.  higher value == higher priority */
	__le16 version;   /* version of message encoding */

	__le32 front_len; /* bytes in main payload */
	__le32 middle_len;/* bytes in middle payload */
	__le32 data_len;  /* bytes of data payload */
	__le16 data_off;  /* sender: include full offset;
			     receiver: mask against ~PAGE_MASK */

	struct ceph_entity_name src;
	__le16 compat_version;
	__le16 reserved;
	__le32 crc;       /* header crc32c */
} __attribute__ ((packed));

#define CEPH_MSG_PRIO_LOW     64
#define CEPH_MSG_PRIO_DEFAULT 127
#define CEPH_MSG_PRIO_HIGH    196
#define CEPH_MSG_PRIO_HIGHEST 255

/*
 * follows data payload
 */
struct ceph_msg_footer_old {
	__le32 front_crc, middle_crc, data_crc;
	__u8 flags;
} __attribute__ ((packed));

struct ceph_msg_footer {
	__le32 front_crc, middle_crc, data_crc;
	// sig holds the 64 bits of the digital signature for the message PLR
	__le64  sig;
	__u8 flags;
} __attribute__ ((packed));

#define CEPH_MSG_FOOTER_COMPLETE  (1<<0)   /* msg wasn't aborted */
#define CEPH_MSG_FOOTER_NOCRC     (1<<1)   /* no data crc */
#define CEPH_MSG_FOOTER_SIGNED	  (1<<2)   /* msg was signed */


#endif