1 #ifndef CEPH_MSGR_H
2 #define CEPH_MSGR_H
3
4 /*
5 * Data types for message passing layer used by Ceph.
6 */
7
8 #define CEPH_MON_PORT 6789 /* default monitor port */
9
10 /*
11 * client-side processes will try to bind to ports in this
12 * range, simply for the benefit of tools like nmap or wireshark
13 * that would like to identify the protocol.
14 */
15 #define CEPH_PORT_FIRST 6789
16 #define CEPH_PORT_START 6800 /* non-monitors start here */
17 #define CEPH_PORT_LAST 6900
18
19 /*
20 * tcp connection banner. include a protocol version. and adjust
21 * whenever the wire protocol changes. try to keep this string length
22 * constant.
23 */
24 #define CEPH_BANNER "ceph v027"
25 #define CEPH_BANNER_MAX_LEN 30
26
27
28 /*
29 * Rollover-safe type and comparator for 32-bit sequence numbers.
30 * Comparator returns -1, 0, or 1.
31 */
32 typedef __u32 ceph_seq_t;
33
ceph_seq_cmp(__u32 a,__u32 b)34 static inline __s32 ceph_seq_cmp(__u32 a, __u32 b)
35 {
36 return (__s32)a - (__s32)b;
37 }
38
39
40 /*
41 * entity_name -- logical name for a process participating in the
42 * network, e.g. 'mds0' or 'osd3'.
43 */
44 struct ceph_entity_name {
45 __u8 type; /* CEPH_ENTITY_TYPE_* */
46 __le64 num;
47 } __attribute__ ((packed));
48
49 #define CEPH_ENTITY_TYPE_MON 0x01
50 #define CEPH_ENTITY_TYPE_MDS 0x02
51 #define CEPH_ENTITY_TYPE_OSD 0x04
52 #define CEPH_ENTITY_TYPE_CLIENT 0x08
53 #define CEPH_ENTITY_TYPE_AUTH 0x20
54
55 #define CEPH_ENTITY_TYPE_ANY 0xFF
56
57 extern const char *ceph_entity_type_name(int type);
58
59 /*
60 * entity_addr -- network address
61 */
62 struct ceph_entity_addr {
63 __le32 type;
64 __le32 nonce; /* unique id for process (e.g. pid) */
65 struct sockaddr_storage in_addr;
66 } __attribute__ ((packed));
67
68 struct ceph_entity_inst {
69 struct ceph_entity_name name;
70 struct ceph_entity_addr addr;
71 } __attribute__ ((packed));
72
73
74 /* used by message exchange protocol */
75 #define CEPH_MSGR_TAG_READY 1 /* server->client: ready for messages */
76 #define CEPH_MSGR_TAG_RESETSESSION 2 /* server->client: reset, try again */
77 #define CEPH_MSGR_TAG_WAIT 3 /* server->client: wait for racing
78 incoming connection */
79 #define CEPH_MSGR_TAG_RETRY_SESSION 4 /* server->client + cseq: try again
80 with higher cseq */
81 #define CEPH_MSGR_TAG_RETRY_GLOBAL 5 /* server->client + gseq: try again
82 with higher gseq */
83 #define CEPH_MSGR_TAG_CLOSE 6 /* closing pipe */
84 #define CEPH_MSGR_TAG_MSG 7 /* message */
85 #define CEPH_MSGR_TAG_ACK 8 /* message ack */
86 #define CEPH_MSGR_TAG_KEEPALIVE 9 /* just a keepalive byte! */
87 #define CEPH_MSGR_TAG_BADPROTOVER 10 /* bad protocol version */
88 #define CEPH_MSGR_TAG_BADAUTHORIZER 11 /* bad authorizer */
89 #define CEPH_MSGR_TAG_FEATURES 12 /* insufficient features */
90
91
92 /*
93 * connection negotiation
94 */
95 struct ceph_msg_connect {
96 __le64 features; /* supported feature bits */
97 __le32 host_type; /* CEPH_ENTITY_TYPE_* */
98 __le32 global_seq; /* count connections initiated by this host */
99 __le32 connect_seq; /* count connections initiated in this session */
100 __le32 protocol_version;
101 __le32 authorizer_protocol;
102 __le32 authorizer_len;
103 __u8 flags; /* CEPH_MSG_CONNECT_* */
104 } __attribute__ ((packed));
105
106 struct ceph_msg_connect_reply {
107 __u8 tag;
108 __le64 features; /* feature bits for this session */
109 __le32 global_seq;
110 __le32 connect_seq;
111 __le32 protocol_version;
112 __le32 authorizer_len;
113 __u8 flags;
114 } __attribute__ ((packed));
115
116 #define CEPH_MSG_CONNECT_LOSSY 1 /* messages i send may be safely dropped */
117
118
119 /*
120 * message header
121 */
122 struct ceph_msg_header_old {
123 __le64 seq; /* message seq# for this session */
124 __le64 tid; /* transaction id */
125 __le16 type; /* message type */
126 __le16 priority; /* priority. higher value == higher priority */
127 __le16 version; /* version of message encoding */
128
129 __le32 front_len; /* bytes in main payload */
130 __le32 middle_len;/* bytes in middle payload */
131 __le32 data_len; /* bytes of data payload */
132 __le16 data_off; /* sender: include full offset;
133 receiver: mask against ~PAGE_MASK */
134
135 struct ceph_entity_inst src, orig_src;
136 __le32 reserved;
137 __le32 crc; /* header crc32c */
138 } __attribute__ ((packed));
139
140 struct ceph_msg_header {
141 __le64 seq; /* message seq# for this session */
142 __le64 tid; /* transaction id */
143 __le16 type; /* message type */
144 __le16 priority; /* priority. higher value == higher priority */
145 __le16 version; /* version of message encoding */
146
147 __le32 front_len; /* bytes in main payload */
148 __le32 middle_len;/* bytes in middle payload */
149 __le32 data_len; /* bytes of data payload */
150 __le16 data_off; /* sender: include full offset;
151 receiver: mask against ~PAGE_MASK */
152
153 struct ceph_entity_name src;
154 __le32 reserved;
155 __le32 crc; /* header crc32c */
156 } __attribute__ ((packed));
157
158 #define CEPH_MSG_PRIO_LOW 64
159 #define CEPH_MSG_PRIO_DEFAULT 127
160 #define CEPH_MSG_PRIO_HIGH 196
161 #define CEPH_MSG_PRIO_HIGHEST 255
162
163 /*
164 * follows data payload
165 */
166 struct ceph_msg_footer {
167 __le32 front_crc, middle_crc, data_crc;
168 __u8 flags;
169 } __attribute__ ((packed));
170
171 #define CEPH_MSG_FOOTER_COMPLETE (1<<0) /* msg wasn't aborted */
172 #define CEPH_MSG_FOOTER_NOCRC (1<<1) /* no data crc */
173
174
175 #endif
176