235 lines
7.2 KiB
C
235 lines
7.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef CEPH_MSGR_H
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#define CEPH_MSGR_H
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/*
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* Data types for message passing layer used by Ceph.
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*/
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#define CEPH_MON_PORT 6789 /* default monitor port */
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/*
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* tcp connection banner. include a protocol version. and adjust
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* whenever the wire protocol changes. try to keep this string length
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* constant.
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*/
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#define CEPH_BANNER "ceph v027"
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#define CEPH_BANNER_LEN 9
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#define CEPH_BANNER_MAX_LEN 30
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/*
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* messenger V2 connection banner prefix.
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* The full banner string should have the form: "ceph v2\n<le16>"
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* the 2 bytes are the length of the remaining banner.
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*/
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#define CEPH_BANNER_V2 "ceph v2\n"
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#define CEPH_BANNER_V2_LEN 8
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#define CEPH_BANNER_V2_PREFIX_LEN (CEPH_BANNER_V2_LEN + sizeof(__le16))
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/*
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* messenger V2 features
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*/
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#define CEPH_MSGR2_INCARNATION_1 (0ull)
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#define DEFINE_MSGR2_FEATURE(bit, incarnation, name) \
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static const uint64_t __maybe_unused CEPH_MSGR2_FEATURE_##name = (1ULL << bit); \
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static const uint64_t __maybe_unused CEPH_MSGR2_FEATUREMASK_##name = \
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(1ULL << bit | CEPH_MSGR2_INCARNATION_##incarnation);
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#define HAVE_MSGR2_FEATURE(x, name) \
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(((x) & (CEPH_MSGR2_FEATUREMASK_##name)) == (CEPH_MSGR2_FEATUREMASK_##name))
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DEFINE_MSGR2_FEATURE( 0, 1, REVISION_1) // msgr2.1
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#define CEPH_MSGR2_SUPPORTED_FEATURES (CEPH_MSGR2_FEATURE_REVISION_1)
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#define CEPH_MSGR2_REQUIRED_FEATURES (CEPH_MSGR2_FEATURE_REVISION_1)
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/*
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* Rollover-safe type and comparator for 32-bit sequence numbers.
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* Comparator returns -1, 0, or 1.
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*/
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typedef __u32 ceph_seq_t;
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static inline __s32 ceph_seq_cmp(__u32 a, __u32 b)
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{
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return (__s32)a - (__s32)b;
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}
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/*
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* entity_name -- logical name for a process participating in the
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* network, e.g. 'mds0' or 'osd3'.
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*/
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struct ceph_entity_name {
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__u8 type; /* CEPH_ENTITY_TYPE_* */
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__le64 num;
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} __attribute__ ((packed));
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#define CEPH_ENTITY_TYPE_MON 0x01
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#define CEPH_ENTITY_TYPE_MDS 0x02
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#define CEPH_ENTITY_TYPE_OSD 0x04
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#define CEPH_ENTITY_TYPE_CLIENT 0x08
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#define CEPH_ENTITY_TYPE_AUTH 0x20
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#define CEPH_ENTITY_TYPE_ANY 0xFF
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extern const char *ceph_entity_type_name(int type);
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/*
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* entity_addr -- network address
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*/
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struct ceph_entity_addr {
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__le32 type; /* CEPH_ENTITY_ADDR_TYPE_* */
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__le32 nonce; /* unique id for process (e.g. pid) */
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struct sockaddr_storage in_addr;
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} __attribute__ ((packed));
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static inline bool ceph_addr_equal_no_type(const struct ceph_entity_addr *lhs,
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const struct ceph_entity_addr *rhs)
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{
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return !memcmp(&lhs->in_addr, &rhs->in_addr, sizeof(lhs->in_addr)) &&
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lhs->nonce == rhs->nonce;
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}
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struct ceph_entity_inst {
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struct ceph_entity_name name;
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struct ceph_entity_addr addr;
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} __attribute__ ((packed));
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/* used by message exchange protocol */
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#define CEPH_MSGR_TAG_READY 1 /* server->client: ready for messages */
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#define CEPH_MSGR_TAG_RESETSESSION 2 /* server->client: reset, try again */
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#define CEPH_MSGR_TAG_WAIT 3 /* server->client: wait for racing
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incoming connection */
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#define CEPH_MSGR_TAG_RETRY_SESSION 4 /* server->client + cseq: try again
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with higher cseq */
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#define CEPH_MSGR_TAG_RETRY_GLOBAL 5 /* server->client + gseq: try again
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with higher gseq */
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#define CEPH_MSGR_TAG_CLOSE 6 /* closing pipe */
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#define CEPH_MSGR_TAG_MSG 7 /* message */
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#define CEPH_MSGR_TAG_ACK 8 /* message ack */
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#define CEPH_MSGR_TAG_KEEPALIVE 9 /* just a keepalive byte! */
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#define CEPH_MSGR_TAG_BADPROTOVER 10 /* bad protocol version */
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#define CEPH_MSGR_TAG_BADAUTHORIZER 11 /* bad authorizer */
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#define CEPH_MSGR_TAG_FEATURES 12 /* insufficient features */
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#define CEPH_MSGR_TAG_SEQ 13 /* 64-bit int follows with seen seq number */
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#define CEPH_MSGR_TAG_KEEPALIVE2 14 /* keepalive2 byte + ceph_timespec */
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#define CEPH_MSGR_TAG_KEEPALIVE2_ACK 15 /* keepalive2 reply */
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#define CEPH_MSGR_TAG_CHALLENGE_AUTHORIZER 16 /* cephx v2 doing server challenge */
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/*
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* connection negotiation
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*/
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struct ceph_msg_connect {
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__le64 features; /* supported feature bits */
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__le32 host_type; /* CEPH_ENTITY_TYPE_* */
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__le32 global_seq; /* count connections initiated by this host */
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__le32 connect_seq; /* count connections initiated in this session */
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__le32 protocol_version;
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__le32 authorizer_protocol;
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__le32 authorizer_len;
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__u8 flags; /* CEPH_MSG_CONNECT_* */
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} __attribute__ ((packed));
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struct ceph_msg_connect_reply {
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__u8 tag;
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__le64 features; /* feature bits for this session */
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__le32 global_seq;
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__le32 connect_seq;
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__le32 protocol_version;
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__le32 authorizer_len;
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__u8 flags;
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} __attribute__ ((packed));
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#define CEPH_MSG_CONNECT_LOSSY 1 /* messages i send may be safely dropped */
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/*
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* message header
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*/
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struct ceph_msg_header_old {
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__le64 seq; /* message seq# for this session */
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__le64 tid; /* transaction id */
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__le16 type; /* message type */
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__le16 priority; /* priority. higher value == higher priority */
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__le16 version; /* version of message encoding */
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__le32 front_len; /* bytes in main payload */
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__le32 middle_len;/* bytes in middle payload */
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__le32 data_len; /* bytes of data payload */
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__le16 data_off; /* sender: include full offset;
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receiver: mask against ~PAGE_MASK */
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struct ceph_entity_inst src, orig_src;
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__le32 reserved;
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__le32 crc; /* header crc32c */
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} __attribute__ ((packed));
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struct ceph_msg_header {
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__le64 seq; /* message seq# for this session */
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__le64 tid; /* transaction id */
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__le16 type; /* message type */
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__le16 priority; /* priority. higher value == higher priority */
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__le16 version; /* version of message encoding */
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__le32 front_len; /* bytes in main payload */
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__le32 middle_len;/* bytes in middle payload */
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__le32 data_len; /* bytes of data payload */
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__le16 data_off; /* sender: include full offset;
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receiver: mask against ~PAGE_MASK */
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struct ceph_entity_name src;
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__le16 compat_version;
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__le16 reserved;
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__le32 crc; /* header crc32c */
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} __attribute__ ((packed));
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struct ceph_msg_header2 {
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__le64 seq; /* message seq# for this session */
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__le64 tid; /* transaction id */
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__le16 type; /* message type */
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__le16 priority; /* priority. higher value == higher priority */
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__le16 version; /* version of message encoding */
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__le32 data_pre_padding_len;
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__le16 data_off; /* sender: include full offset;
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receiver: mask against ~PAGE_MASK */
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__le64 ack_seq;
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__u8 flags;
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/* oldest code we think can decode this. unknown if zero. */
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__le16 compat_version;
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__le16 reserved;
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} __attribute__ ((packed));
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#define CEPH_MSG_PRIO_LOW 64
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#define CEPH_MSG_PRIO_DEFAULT 127
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#define CEPH_MSG_PRIO_HIGH 196
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#define CEPH_MSG_PRIO_HIGHEST 255
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/*
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* follows data payload
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*/
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struct ceph_msg_footer_old {
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__le32 front_crc, middle_crc, data_crc;
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__u8 flags;
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} __attribute__ ((packed));
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struct ceph_msg_footer {
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__le32 front_crc, middle_crc, data_crc;
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// sig holds the 64 bits of the digital signature for the message PLR
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__le64 sig;
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__u8 flags;
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} __attribute__ ((packed));
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#define CEPH_MSG_FOOTER_COMPLETE (1<<0) /* msg wasn't aborted */
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#define CEPH_MSG_FOOTER_NOCRC (1<<1) /* no data crc */
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#define CEPH_MSG_FOOTER_SIGNED (1<<2) /* msg was signed */
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#endif
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