linux-imx

/*

 *  IEEE 802.1D Generic Attribute Registration Protocol (GARP)

 *

 *  Copyright (c) 2008 Patrick McHardy <kaber@trash.net>

 *

 *  This program is free software; you can redistribute it and/or

 *  modify it under the terms of the GNU General Public License

 *  version 2 as published by the Free Software Foundation.

 */

#include <linux/kernel.h>

#include <linux/timer.h>

#include <linux/skbuff.h>

#include <linux/netdevice.h>

#include <linux/etherdevice.h>

#include <linux/rtnetlink.h>

#include <linux/llc.h>

#include <linux/slab.h>

#include <linux/module.h>

#include <net/llc.h>

#include <net/llc_pdu.h>

#include <net/garp.h>

#include <asm/unaligned.h>

​

static unsigned int garp_join_time __read_mostly = 200;

module_param(garp_join_time, uint, 0644);

MODULE_PARM_DESC(garp_join_time, "Join time in ms (default 200ms)");

MODULE_LICENSE("GPL");

​

static const struct garp_state_trans {

    u8  state;

    u8  action;

} garp_applicant_state_table[GARP_APPLICANT_MAX + 1][GARP_EVENT_MAX + 1] = {

    [GARP_APPLICANT_VA] = {

        [GARP_EVENT_TRANSMIT_PDU]   = { .state = GARP_APPLICANT_AA,

                            .action = GARP_ACTION_S_JOIN_IN },

        [GARP_EVENT_R_JOIN_IN]      = { .state = GARP_APPLICANT_AA },

        [GARP_EVENT_R_JOIN_EMPTY]   = { .state = GARP_APPLICANT_VA },

        [GARP_EVENT_R_EMPTY]        = { .state = GARP_APPLICANT_VA },

        [GARP_EVENT_R_LEAVE_IN]     = { .state = GARP_APPLICANT_VA },

        [GARP_EVENT_R_LEAVE_EMPTY]  = { .state = GARP_APPLICANT_VP },

        [GARP_EVENT_REQ_JOIN]       = { .state = GARP_APPLICANT_INVALID },

        [GARP_EVENT_REQ_LEAVE]      = { .state = GARP_APPLICANT_LA },

    },

    [GARP_APPLICANT_AA] = {

        [GARP_EVENT_TRANSMIT_PDU]   = { .state = GARP_APPLICANT_QA,

                            .action = GARP_ACTION_S_JOIN_IN },

        [GARP_EVENT_R_JOIN_IN]      = { .state = GARP_APPLICANT_QA },

        [GARP_EVENT_R_JOIN_EMPTY]   = { .state = GARP_APPLICANT_VA },

        [GARP_EVENT_R_EMPTY]        = { .state = GARP_APPLICANT_VA },

        [GARP_EVENT_R_LEAVE_IN]     = { .state = GARP_APPLICANT_VA },

        [GARP_EVENT_R_LEAVE_EMPTY]  = { .state = GARP_APPLICANT_VP },

        [GARP_EVENT_REQ_JOIN]       = { .state = GARP_APPLICANT_INVALID },

        [GARP_EVENT_REQ_LEAVE]      = { .state = GARP_APPLICANT_LA },

    },

    [GARP_APPLICANT_QA] = {

        [GARP_EVENT_TRANSMIT_PDU]   = { .state = GARP_APPLICANT_INVALID },

        [GARP_EVENT_R_JOIN_IN]      = { .state = GARP_APPLICANT_QA },

        [GARP_EVENT_R_JOIN_EMPTY]   = { .state = GARP_APPLICANT_VA },

        [GARP_EVENT_R_EMPTY]        = { .state = GARP_APPLICANT_VA },

        [GARP_EVENT_R_LEAVE_IN]     = { .state = GARP_APPLICANT_VP },

        [GARP_EVENT_R_LEAVE_EMPTY]  = { .state = GARP_APPLICANT_VP },

        [GARP_EVENT_REQ_JOIN]       = { .state = GARP_APPLICANT_INVALID },

        [GARP_EVENT_REQ_LEAVE]      = { .state = GARP_APPLICANT_LA },

    },

    [GARP_APPLICANT_LA] = {

        [GARP_EVENT_TRANSMIT_PDU]   = { .state = GARP_APPLICANT_VO,

                            .action = GARP_ACTION_S_LEAVE_EMPTY },

        [GARP_EVENT_R_JOIN_IN]      = { .state = GARP_APPLICANT_LA },

        [GARP_EVENT_R_JOIN_EMPTY]   = { .state = GARP_APPLICANT_VO },

        [GARP_EVENT_R_EMPTY]        = { .state = GARP_APPLICANT_LA },

        [GARP_EVENT_R_LEAVE_IN]     = { .state = GARP_APPLICANT_LA },

        [GARP_EVENT_R_LEAVE_EMPTY]  = { .state = GARP_APPLICANT_VO },

        [GARP_EVENT_REQ_JOIN]       = { .state = GARP_APPLICANT_VA },

        [GARP_EVENT_REQ_LEAVE]      = { .state = GARP_APPLICANT_INVALID },

    },

    [GARP_APPLICANT_VP] = {

        [GARP_EVENT_TRANSMIT_PDU]   = { .state = GARP_APPLICANT_AA,

                            .action = GARP_ACTION_S_JOIN_IN },

        [GARP_EVENT_R_JOIN_IN]      = { .state = GARP_APPLICANT_AP },

        [GARP_EVENT_R_JOIN_EMPTY]   = { .state = GARP_APPLICANT_VP },

        [GARP_EVENT_R_EMPTY]        = { .state = GARP_APPLICANT_VP },

        [GARP_EVENT_R_LEAVE_IN]     = { .state = GARP_APPLICANT_VP },

        [GARP_EVENT_R_LEAVE_EMPTY]  = { .state = GARP_APPLICANT_VP },

        [GARP_EVENT_REQ_JOIN]       = { .state = GARP_APPLICANT_INVALID },

        [GARP_EVENT_REQ_LEAVE]      = { .state = GARP_APPLICANT_VO },

    },

    [GARP_APPLICANT_AP] = {

        [GARP_EVENT_TRANSMIT_PDU]   = { .state = GARP_APPLICANT_QA,

                            .action = GARP_ACTION_S_JOIN_IN },

        [GARP_EVENT_R_JOIN_IN]      = { .state = GARP_APPLICANT_QP },

        [GARP_EVENT_R_JOIN_EMPTY]   = { .state = GARP_APPLICANT_VP },

        [GARP_EVENT_R_EMPTY]        = { .state = GARP_APPLICANT_VP },