include/linux/ceph/msgr.h

   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  * client-side processes will try to bind to ports in this
  13  * range, simply for the benefit of tools like nmap or wireshark
  14  * that would like to identify the protocol.
  15  */
  16 #define CEPH_PORT_FIRST  6789
  17 #define CEPH_PORT_START  6800  /* non-monitors start here */
  18 #define CEPH_PORT_LAST   6900
  19
  20 /*
  21  * tcp connection banner.  include a protocol version. and adjust
  22  * whenever the wire protocol changes.  try to keep this string length
  23  * constant.
  24  */
  25 #define CEPH_BANNER "ceph v027"
  26 #define CEPH_BANNER_MAX_LEN 30
  27
  28
  29 /*
  30  * Rollover-safe type and comparator for 32-bit sequence numbers.
  31  * Comparator returns -1, 0, or 1.
  32  */
  33 typedef __u32 ceph_seq_t;
  34
  35 static inline __s32 ceph_seq_cmp(__u32 a, __u32 b)
  36 {
  37        return (__s32)a - (__s32)b;
  38 }
  39
  40
  41 /*
  42  * entity_name -- logical name for a process participating in the
  43  * network, e.g. 'mds0' or 'osd3'.
  44  */
  45 struct ceph_entity_name {
  46         __u8 type;      /* CEPH_ENTITY_TYPE_* */
  47         __le64 num;
  48 } __attribute__ ((packed));
  49
  50 #define CEPH_ENTITY_TYPE_MON    0x01
  51 #define CEPH_ENTITY_TYPE_MDS    0x02
  52 #define CEPH_ENTITY_TYPE_OSD    0x04
  53 #define CEPH_ENTITY_TYPE_CLIENT 0x08
  54 #define CEPH_ENTITY_TYPE_AUTH   0x20
  55
  56 #define CEPH_ENTITY_TYPE_ANY    0xFF
  57
  58 extern const char *ceph_entity_type_name(int type);
  59
  60 /*
  61  * entity_addr -- network address
  62  */
  63 struct ceph_entity_addr {
  64         __le32 type;
  65         __le32 nonce;  /* unique id for process (e.g. pid) */
  66         struct sockaddr_storage in_addr;
  67 } __attribute__ ((packed));
  68
  69 struct ceph_entity_inst {
  70         struct ceph_entity_name name;
  71         struct ceph_entity_addr addr;
  72 } __attribute__ ((packed));
  73
  74
  75 /* used by message exchange protocol */
  76 #define CEPH_MSGR_TAG_READY         1  /* server->client: ready for messages */
  77 #define CEPH_MSGR_TAG_RESETSESSION  2  /* server->client: reset, try again */
  78 #define CEPH_MSGR_TAG_WAIT          3  /* server->client: wait for racing
  79                                           incoming connection */
  80 #define CEPH_MSGR_TAG_RETRY_SESSION 4  /* server->client + cseq: try again
  81                                           with higher cseq */
  82 #define CEPH_MSGR_TAG_RETRY_GLOBAL  5  /* server->client + gseq: try again
  83                                           with higher gseq */
  84 #define CEPH_MSGR_TAG_CLOSE         6  /* closing pipe */
  85 #define CEPH_MSGR_TAG_MSG           7  /* message */
  86 #define CEPH_MSGR_TAG_ACK           8  /* message ack */
  87 #define CEPH_MSGR_TAG_KEEPALIVE     9  /* just a keepalive byte! */
  88 #define CEPH_MSGR_TAG_BADPROTOVER   10 /* bad protocol version */
  89 #define CEPH_MSGR_TAG_BADAUTHORIZER 11 /* bad authorizer */
  90 #define CEPH_MSGR_TAG_FEATURES      12 /* insufficient features */
  91 #define CEPH_MSGR_TAG_SEQ           13 /* 64-bit int follows with seen seq number */
  92 #define CEPH_MSGR_TAG_KEEPALIVE2    14 /* keepalive2 byte + ceph_timespec */
  93 #define CEPH_MSGR_TAG_KEEPALIVE2_ACK 15 /* keepalive2 reply */
  94
  95
  96 /*
  97  * connection negotiation
  98  */
  99 struct ceph_msg_connect {
 100         __le64 features;     /* supported feature bits */
 101         __le32 host_type;    /* CEPH_ENTITY_TYPE_* */
 102         __le32 global_seq;   /* count connections initiated by this host */
 103         __le32 connect_seq;  /* count connections initiated in this session */
 104         __le32 protocol_version;
 105         __le32 authorizer_protocol;
 106         __le32 authorizer_len;
 107         __u8  flags;         /* CEPH_MSG_CONNECT_* */
 108 } __attribute__ ((packed));
 109
 110 struct ceph_msg_connect_reply {
 111         __u8 tag;
 112         __le64 features;     /* feature bits for this session */
 113         __le32 global_seq;
 114         __le32 connect_seq;
 115         __le32 protocol_version;
 116         __le32 authorizer_len;
 117         __u8 flags;
 118 } __attribute__ ((packed));
 119
 120 #define CEPH_MSG_CONNECT_LOSSY  1  /* messages i send may be safely dropped */
 121
 122
 123 /*
 124  * message header
 125  */
 126 struct ceph_msg_header_old {
 127         __le64 seq;       /* message seq# for this session */
 128         __le64 tid;       /* transaction id */
 129         __le16 type;      /* message type */
 130         __le16 priority;  /* priority.  higher value == higher priority */
 131         __le16 version;   /* version of message encoding */
 132
 133         __le32 front_len; /* bytes in main payload */
 134         __le32 middle_len;/* bytes in middle payload */
 135         __le32 data_len;  /* bytes of data payload */
 136         __le16 data_off;  /* sender: include full offset;
 137                              receiver: mask against ~PAGE_MASK */
 138
 139         struct ceph_entity_inst src, orig_src;
 140         __le32 reserved;
 141         __le32 crc;       /* header crc32c */
 142 } __attribute__ ((packed));
 143
 144 struct ceph_msg_header {
 145         __le64 seq;       /* message seq# for this session */
 146         __le64 tid;       /* transaction id */
 147         __le16 type;      /* message type */
 148         __le16 priority;  /* priority.  higher value == higher priority */
 149         __le16 version;   /* version of message encoding */
 150
 151         __le32 front_len; /* bytes in main payload */
 152         __le32 middle_len;/* bytes in middle payload */
 153         __le32 data_len;  /* bytes of data payload */
 154         __le16 data_off;  /* sender: include full offset;
 155                              receiver: mask against ~PAGE_MASK */
 156
 157         struct ceph_entity_name src;
 158         __le16 compat_version;
 159         __le16 reserved;
 160         __le32 crc;       /* header crc32c */
 161 } __attribute__ ((packed));
 162
 163 #define CEPH_MSG_PRIO_LOW     64
 164 #define CEPH_MSG_PRIO_DEFAULT 127
 165 #define CEPH_MSG_PRIO_HIGH    196
 166 #define CEPH_MSG_PRIO_HIGHEST 255
 167
 168 /*
 169  * follows data payload
 170  */
 171 struct ceph_msg_footer_old {
 172         __le32 front_crc, middle_crc, data_crc;
 173         __u8 flags;
 174 } __attribute__ ((packed));
 175
 176 struct ceph_msg_footer {
 177         __le32 front_crc, middle_crc, data_crc;
 178         // sig holds the 64 bits of the digital signature for the message PLR
 179         __le64  sig;
 180         __u8 flags;
 181 } __attribute__ ((packed));
 182
 183 #define CEPH_MSG_FOOTER_COMPLETE  (1<<0)   /* msg wasn't aborted */
 184 #define CEPH_MSG_FOOTER_NOCRC     (1<<1)   /* no data crc */
 185 #define CEPH_MSG_FOOTER_SIGNED    (1<<2)   /* msg was signed */
 186
 187
 188 #endif