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[linux-2.6/next.git] / include / linux / tipc_config.h

/*
 * include/linux/tipc_config.h: Include file for TIPC configuration interface
 *
 * Copyright (c) 2003-2006, Ericsson AB
 * Copyright (c) 2005-2007, 2010-2011, Wind River Systems
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the names of the copyright holders nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _LINUX_TIPC_CONFIG_H_
#define _LINUX_TIPC_CONFIG_H_

#include <linux/types.h>
#include <linux/string.h>
#include <asm/byteorder.h>

/*
 * Configuration
 *
 * All configuration management messaging involves sending a request message
 * to the TIPC configuration service on a node, which sends a reply message
 * back.  (In the future multi-message replies may be supported.)
 *
 * Both request and reply messages consist of a transport header and payload.
 * The transport header contains info about the desired operation;
 * the payload consists of zero or more type/length/value (TLV) items
 * which specify parameters or results for the operation.
 *
 * For many operations, the request and reply messages have a fixed number
 * of TLVs (usually zero or one); however, some reply messages may return
 * a variable number of TLVs.  A failed request is denoted by the presence
 * of an "error string" TLV in the reply message instead of the TLV(s) the
 * reply should contain if the request succeeds.
 */

/*
 * Public commands:
 * May be issued by any process.
 * Accepted by own node, or by remote node only if remote management enabled.
 */

#define  TIPC_CMD_NOOP              0x0000    /* tx none, rx none */
#define  TIPC_CMD_GET_NODES         0x0001    /* tx net_addr, rx node_info(s) */
#define  TIPC_CMD_GET_MEDIA_NAMES   0x0002    /* tx none, rx media_name(s) */
#define  TIPC_CMD_GET_BEARER_NAMES  0x0003    /* tx none, rx bearer_name(s) */
#define  TIPC_CMD_GET_LINKS         0x0004    /* tx net_addr, rx link_info(s) */
#define  TIPC_CMD_SHOW_NAME_TABLE   0x0005    /* tx name_tbl_query, rx ultra_string */
#define  TIPC_CMD_SHOW_PORTS        0x0006    /* tx none, rx ultra_string */
#define  TIPC_CMD_SHOW_LINK_STATS   0x000B    /* tx link_name, rx ultra_string */
#define  TIPC_CMD_SHOW_STATS        0x000F    /* tx unsigned, rx ultra_string */

/*
 * Protected commands:
 * May only be issued by "network administration capable" process.
 * Accepted by own node, or by remote node only if remote management enabled
 * and this node is zone manager.
 */

#define  TIPC_CMD_GET_REMOTE_MNG    0x4003    /* tx none, rx unsigned */
#define  TIPC_CMD_GET_MAX_PORTS     0x4004    /* tx none, rx unsigned */
#define  TIPC_CMD_GET_MAX_PUBL      0x4005    /* tx none, rx unsigned */
#define  TIPC_CMD_GET_MAX_SUBSCR    0x4006    /* tx none, rx unsigned */
#define  TIPC_CMD_GET_MAX_ZONES     0x4007    /* obsoleted */
#define  TIPC_CMD_GET_MAX_CLUSTERS  0x4008    /* obsoleted */
#define  TIPC_CMD_GET_MAX_NODES     0x4009    /* obsoleted */
#define  TIPC_CMD_GET_MAX_SLAVES    0x400A    /* obsoleted */
#define  TIPC_CMD_GET_NETID         0x400B    /* tx none, rx unsigned */

#define  TIPC_CMD_ENABLE_BEARER     0x4101    /* tx bearer_config, rx none */
#define  TIPC_CMD_DISABLE_BEARER    0x4102    /* tx bearer_name, rx none */
#define  TIPC_CMD_SET_LINK_TOL      0x4107    /* tx link_config, rx none */
#define  TIPC_CMD_SET_LINK_PRI      0x4108    /* tx link_config, rx none */
#define  TIPC_CMD_SET_LINK_WINDOW   0x4109    /* tx link_config, rx none */
#define  TIPC_CMD_SET_LOG_SIZE      0x410A    /* tx unsigned, rx none */
#define  TIPC_CMD_DUMP_LOG          0x410B    /* tx none, rx ultra_string */
#define  TIPC_CMD_RESET_LINK_STATS  0x410C    /* tx link_name, rx none */

/*
 * Private commands:
 * May only be issued by "network administration capable" process.
 * Accepted by own node only; cannot be used on a remote node.
 */

#define  TIPC_CMD_SET_NODE_ADDR     0x8001    /* tx net_addr, rx none */
#define  TIPC_CMD_SET_REMOTE_MNG    0x8003    /* tx unsigned, rx none */
#define  TIPC_CMD_SET_MAX_PORTS     0x8004    /* tx unsigned, rx none */
#define  TIPC_CMD_SET_MAX_PUBL      0x8005    /* tx unsigned, rx none */
#define  TIPC_CMD_SET_MAX_SUBSCR    0x8006    /* tx unsigned, rx none */
#define  TIPC_CMD_SET_MAX_ZONES     0x8007    /* obsoleted */
#define  TIPC_CMD_SET_MAX_CLUSTERS  0x8008    /* obsoleted */
#define  TIPC_CMD_SET_MAX_NODES     0x8009    /* obsoleted */
#define  TIPC_CMD_SET_MAX_SLAVES    0x800A    /* obsoleted */
#define  TIPC_CMD_SET_NETID         0x800B    /* tx unsigned, rx none */

/*
 * Reserved commands:
 * May not be issued by any process.
 * Used internally by TIPC.
 */

#define  TIPC_CMD_NOT_NET_ADMIN     0xC001    /* tx none, rx none */

/*
 * TLV types defined for TIPC
 */

#define TIPC_TLV_NONE           0       /* no TLV present */
#define TIPC_TLV_VOID           1       /* empty TLV (0 data bytes)*/
#define TIPC_TLV_UNSIGNED       2       /* 32-bit integer */
#define TIPC_TLV_STRING         3       /* char[128] (max) */
#define TIPC_TLV_LARGE_STRING   4       /* char[2048] (max) */
#define TIPC_TLV_ULTRA_STRING   5       /* char[32768] (max) */

#define TIPC_TLV_ERROR_STRING   16      /* char[128] containing "error code" */
#define TIPC_TLV_NET_ADDR       17      /* 32-bit integer denoting <Z.C.N> */
#define TIPC_TLV_MEDIA_NAME     18      /* char[TIPC_MAX_MEDIA_NAME] */
#define TIPC_TLV_BEARER_NAME    19      /* char[TIPC_MAX_BEARER_NAME] */
#define TIPC_TLV_LINK_NAME      20      /* char[TIPC_MAX_LINK_NAME] */
#define TIPC_TLV_NODE_INFO      21      /* struct tipc_node_info */
#define TIPC_TLV_LINK_INFO      22      /* struct tipc_link_info */
#define TIPC_TLV_BEARER_CONFIG  23      /* struct tipc_bearer_config */
#define TIPC_TLV_LINK_CONFIG    24      /* struct tipc_link_config */
#define TIPC_TLV_NAME_TBL_QUERY 25      /* struct tipc_name_table_query */
#define TIPC_TLV_PORT_REF       26      /* 32-bit port reference */

/*
 * Maximum sizes of TIPC bearer-related names (including terminating NUL)
 */

#define TIPC_MAX_MEDIA_NAME     16      /* format = media */
#define TIPC_MAX_IF_NAME        16      /* format = interface */
#define TIPC_MAX_BEARER_NAME    32      /* format = media:interface */
#define TIPC_MAX_LINK_NAME      60      /* format = Z.C.N:interface-Z.C.N:interface */

/*
 * Link priority limits (min, default, max, media default)
 */

#define TIPC_MIN_LINK_PRI       0
#define TIPC_DEF_LINK_PRI       10
#define TIPC_MAX_LINK_PRI       31
#define TIPC_MEDIA_LINK_PRI     (TIPC_MAX_LINK_PRI + 1)

/*
 * Link tolerance limits (min, default, max), in ms
 */

#define TIPC_MIN_LINK_TOL 50
#define TIPC_DEF_LINK_TOL 1500
#define TIPC_MAX_LINK_TOL 30000

#if (TIPC_MIN_LINK_TOL < 16)
#error "TIPC_MIN_LINK_TOL is too small (abort limit may be NaN)"
#endif

/*
 * Link window limits (min, default, max), in packets
 */

#define TIPC_MIN_LINK_WIN 16
#define TIPC_DEF_LINK_WIN 50
#define TIPC_MAX_LINK_WIN 150


struct tipc_node_info {
        __be32 addr;                    /* network address of node */
        __be32 up;                      /* 0=down, 1= up */
};

struct tipc_link_info {
        __be32 dest;                    /* network address of peer node */
        __be32 up;                      /* 0=down, 1=up */
        char str[TIPC_MAX_LINK_NAME];   /* link name */
};

struct tipc_bearer_config {
        __be32 priority;                /* Range [1,31]. Override per link  */
        __be32 disc_domain;             /* <Z.C.N> describing desired nodes */
        char name[TIPC_MAX_BEARER_NAME];
};

struct tipc_link_config {
        __be32 value;
        char name[TIPC_MAX_LINK_NAME];
};

#define TIPC_NTQ_ALLTYPES 0x80000000

struct tipc_name_table_query {
        __be32 depth;   /* 1:type, 2:+name info, 3:+port info, 4+:+debug info */
        __be32 type;    /* {t,l,u} info ignored if high bit of "depth" is set */
        __be32 lowbound; /* (i.e. displays all entries of name table) */
        __be32 upbound;
};

/*
 * The error string TLV is a null-terminated string describing the cause
 * of the request failure.  To simplify error processing (and to save space)
 * the first character of the string can be a special error code character
 * (lying by the range 0x80 to 0xFF) which represents a pre-defined reason.
 */

#define TIPC_CFG_TLV_ERROR      "\x80"  /* request contains incorrect TLV(s) */
#define TIPC_CFG_NOT_NET_ADMIN  "\x81"  /* must be network administrator */
#define TIPC_CFG_NOT_ZONE_MSTR  "\x82"  /* must be zone master */
#define TIPC_CFG_NO_REMOTE      "\x83"  /* remote management not enabled */
#define TIPC_CFG_NOT_SUPPORTED  "\x84"  /* request is not supported by TIPC */
#define TIPC_CFG_INVALID_VALUE  "\x85"  /* request has invalid argument value */

/*
 * A TLV consists of a descriptor, followed by the TLV value.
 * TLV descriptor fields are stored in network byte order;
 * TLV values must also be stored in network byte order (where applicable).
 * TLV descriptors must be aligned to addresses which are multiple of 4,
 * so up to 3 bytes of padding may exist at the end of the TLV value area.
 * There must not be any padding between the TLV descriptor and its value.
 */

struct tlv_desc {
        __be16 tlv_len;         /* TLV length (descriptor + value) */
        __be16 tlv_type;                /* TLV identifier */
};

#define TLV_ALIGNTO 4

#define TLV_ALIGN(datalen) (((datalen)+(TLV_ALIGNTO-1)) & ~(TLV_ALIGNTO-1))
#define TLV_LENGTH(datalen) (sizeof(struct tlv_desc) + (datalen))
#define TLV_SPACE(datalen) (TLV_ALIGN(TLV_LENGTH(datalen)))
#define TLV_DATA(tlv) ((void *)((char *)(tlv) + TLV_LENGTH(0)))

static inline int TLV_OK(const void *tlv, __u16 space)
{
        /*
         * Would also like to check that "tlv" is a multiple of 4,
         * but don't know how to do this in a portable way.
         * - Tried doing (!(tlv & (TLV_ALIGNTO-1))), but GCC compiler
         *   won't allow binary "&" with a pointer.
         * - Tried casting "tlv" to integer type, but causes warning about size
         *   mismatch when pointer is bigger than chosen type (int, long, ...).
         */

        return (space >= TLV_SPACE(0)) &&
                (ntohs(((struct tlv_desc *)tlv)->tlv_len) <= space);
}

static inline int TLV_CHECK(const void *tlv, __u16 space, __u16 exp_type)
{
        return TLV_OK(tlv, space) &&
                (ntohs(((struct tlv_desc *)tlv)->tlv_type) == exp_type);
}

static inline int TLV_SET(void *tlv, __u16 type, void *data, __u16 len)
{
        struct tlv_desc *tlv_ptr;
        int tlv_len;

        tlv_len = TLV_LENGTH(len);
        tlv_ptr = (struct tlv_desc *)tlv;
        tlv_ptr->tlv_type = htons(type);
        tlv_ptr->tlv_len  = htons(tlv_len);
        if (len && data)
                memcpy(TLV_DATA(tlv_ptr), data, tlv_len);
        return TLV_SPACE(len);
}

/*
 * A TLV list descriptor simplifies processing of messages
 * containing multiple TLVs.
 */

struct tlv_list_desc {
        struct tlv_desc *tlv_ptr;       /* ptr to current TLV */
        __u32 tlv_space;                /* # bytes from curr TLV to list end */
};

static inline void TLV_LIST_INIT(struct tlv_list_desc *list,
                                 void *data, __u32 space)
{
        list->tlv_ptr = (struct tlv_desc *)data;
        list->tlv_space = space;
}

static inline int TLV_LIST_EMPTY(struct tlv_list_desc *list)
{
        return (list->tlv_space == 0);
}

static inline int TLV_LIST_CHECK(struct tlv_list_desc *list, __u16 exp_type)
{
        return TLV_CHECK(list->tlv_ptr, list->tlv_space, exp_type);
}

static inline void *TLV_LIST_DATA(struct tlv_list_desc *list)
{
        return TLV_DATA(list->tlv_ptr);
}

static inline void TLV_LIST_STEP(struct tlv_list_desc *list)
{
        __u16 tlv_space = TLV_ALIGN(ntohs(list->tlv_ptr->tlv_len));

        list->tlv_ptr = (struct tlv_desc *)((char *)list->tlv_ptr + tlv_space);
        list->tlv_space -= tlv_space;
}

/*
 * Configuration messages exchanged via NETLINK_GENERIC use the following
 * family id, name, version and command.
 */
#define TIPC_GENL_NAME          "TIPC"
#define TIPC_GENL_VERSION       0x1
#define TIPC_GENL_CMD           0x1

/*
 * TIPC specific header used in NETLINK_GENERIC requests.
 */
struct tipc_genlmsghdr {
        __u32 dest;             /* Destination address */
        __u16 cmd;              /* Command */
        __u16 reserved;         /* Unused */
};

#define TIPC_GENL_HDRLEN        NLMSG_ALIGN(sizeof(struct tipc_genlmsghdr))

/*
 * Configuration messages exchanged via TIPC sockets use the TIPC configuration
 * message header, which is defined below.  This structure is analogous
 * to the Netlink message header, but fields are stored in network byte order
 * and no padding is permitted between the header and the message data
 * that follows.
 */

struct tipc_cfg_msg_hdr {
        __be32 tcm_len;         /* Message length (including header) */
        __be16 tcm_type;        /* Command type */
        __be16 tcm_flags;       /* Additional flags */
        char  tcm_reserved[8];  /* Unused */
};

#define TCM_F_REQUEST   0x1     /* Flag: Request message */
#define TCM_F_MORE      0x2     /* Flag: Message to be continued */

#define TCM_ALIGN(datalen)  (((datalen)+3) & ~3)
#define TCM_LENGTH(datalen) (sizeof(struct tipc_cfg_msg_hdr) + datalen)
#define TCM_SPACE(datalen)  (TCM_ALIGN(TCM_LENGTH(datalen)))
#define TCM_DATA(tcm_hdr)   ((void *)((char *)(tcm_hdr) + TCM_LENGTH(0)))

static inline int TCM_SET(void *msg, __u16 cmd, __u16 flags,
                          void *data, __u16 data_len)
{
        struct tipc_cfg_msg_hdr *tcm_hdr;
        int msg_len;

        msg_len = TCM_LENGTH(data_len);
        tcm_hdr = (struct tipc_cfg_msg_hdr *)msg;
        tcm_hdr->tcm_len   = htonl(msg_len);
        tcm_hdr->tcm_type  = htons(cmd);
        tcm_hdr->tcm_flags = htons(flags);
        if (data_len && data)
                memcpy(TCM_DATA(msg), data, data_len);
        return TCM_SPACE(data_len);
}

#endif