| /* SPDX-License-Identifier: MIT |
| * |
| * Details of the "wire" protocol between Xen Store Daemon and client |
| * library or guest kernel. |
| * |
| * Copyright (C) 2005 Rusty Russell IBM Corporation |
| */ |
| |
| #ifndef _XS_WIRE_H |
| #define _XS_WIRE_H |
| |
| enum xsd_sockmsg_type { |
| XS_CONTROL, |
| #define XS_DEBUG XS_CONTROL |
| XS_DIRECTORY, |
| XS_READ, |
| XS_GET_PERMS, |
| XS_WATCH, |
| XS_UNWATCH, |
| XS_TRANSACTION_START, |
| XS_TRANSACTION_END, |
| XS_INTRODUCE, |
| XS_RELEASE, |
| XS_GET_DOMAIN_PATH, |
| XS_WRITE, |
| XS_MKDIR, |
| XS_RM, |
| XS_SET_PERMS, |
| XS_WATCH_EVENT, |
| XS_ERROR, |
| XS_IS_DOMAIN_INTRODUCED, |
| XS_RESUME, |
| XS_SET_TARGET, |
| /* XS_RESTRICT has been removed */ |
| XS_RESET_WATCHES = XS_SET_TARGET + 2, |
| XS_DIRECTORY_PART, |
| |
| XS_TYPE_COUNT, /* Number of valid types. */ |
| |
| XS_INVALID = 0xffff /* Guaranteed to remain an invalid type */ |
| }; |
| |
| #define XS_WRITE_NONE "NONE" |
| #define XS_WRITE_CREATE "CREATE" |
| #define XS_WRITE_CREATE_EXCL "CREATE|EXCL" |
| |
| /* We hand errors as strings, for portability. */ |
| struct xsd_errors { |
| int errnum; |
| const char *errstring; |
| }; |
| |
| #ifdef EINVAL |
| #define XSD_ERROR(x) { x, #x } |
| /* LINTED: static unused */ |
| static struct xsd_errors xsd_errors[] |
| #if defined(__GNUC__) |
| __attribute__((unused)) |
| #endif |
| = { |
| XSD_ERROR(EINVAL), |
| XSD_ERROR(EACCES), |
| XSD_ERROR(EEXIST), |
| XSD_ERROR(EISDIR), |
| XSD_ERROR(ENOENT), |
| XSD_ERROR(ENOMEM), |
| XSD_ERROR(ENOSPC), |
| XSD_ERROR(EIO), |
| XSD_ERROR(ENOTEMPTY), |
| XSD_ERROR(ENOSYS), |
| XSD_ERROR(EROFS), |
| XSD_ERROR(EBUSY), |
| XSD_ERROR(EAGAIN), |
| XSD_ERROR(EISCONN), |
| XSD_ERROR(E2BIG) |
| }; |
| #endif |
| |
| struct xsd_sockmsg { |
| u32 type; /* XS_??? */ |
| u32 req_id;/* Request identifier, echoed in daemon's response. */ |
| u32 tx_id; /* Transaction id (0 if not related to a transaction). */ |
| u32 len; /* Length of data following this. */ |
| |
| /* Generally followed by nul-terminated string(s). */ |
| }; |
| |
| enum xs_watch_type { |
| XS_WATCH_PATH = 0, |
| XS_WATCH_TOKEN |
| }; |
| |
| /* |
| * `incontents 150 xenstore_struct XenStore wire protocol. |
| * |
| * Inter-domain shared memory communications. |
| */ |
| #define XENSTORE_RING_SIZE 1024 |
| typedef u32 XENSTORE_RING_IDX; |
| #define MASK_XENSTORE_IDX(idx) ((idx) & (XENSTORE_RING_SIZE - 1)) |
| struct xenstore_domain_interface { |
| char req[XENSTORE_RING_SIZE]; /* Requests to xenstore daemon. */ |
| char rsp[XENSTORE_RING_SIZE]; /* Replies and async watch events. */ |
| XENSTORE_RING_IDX req_cons, req_prod; |
| XENSTORE_RING_IDX rsp_cons, rsp_prod; |
| u32 server_features; /* Bitmap of features supported by the server */ |
| u32 connection; |
| }; |
| |
| /* Violating this is very bad. See docs/misc/xenstore.txt. */ |
| #define XENSTORE_PAYLOAD_MAX 4096 |
| |
| /* Violating these just gets you an error back */ |
| #define XENSTORE_ABS_PATH_MAX 3072 |
| #define XENSTORE_REL_PATH_MAX 2048 |
| |
| /* The ability to reconnect a ring */ |
| #define XENSTORE_SERVER_FEATURE_RECONNECTION 1 |
| |
| /* Valid values for the connection field */ |
| #define XENSTORE_CONNECTED 0 /* the steady-state */ |
| #define XENSTORE_RECONNECT 1 /* guest has initiated a reconnect */ |
| |
| #endif /* _XS_WIRE_H */ |
| |
| /* |
| * Local variables: |
| * mode: C |
| * c-file-style: "BSD" |
| * c-basic-offset: 4 |
| * tab-width: 8 |
| * indent-tabs-mode: nil |
| * End: |
| */ |