639 lines
18 KiB
C
639 lines
18 KiB
C
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/*
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* IEEE 802.1D Generic Attribute Registration Protocol (GARP)
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*
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* Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/timer.h>
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#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/rtnetlink.h>
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#include <linux/llc.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <net/llc.h>
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#include <net/llc_pdu.h>
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#include <net/garp.h>
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#include <asm/unaligned.h>
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static unsigned int garp_join_time __read_mostly = 200;
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module_param(garp_join_time, uint, 0644);
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MODULE_PARM_DESC(garp_join_time, "Join time in ms (default 200ms)");
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MODULE_LICENSE("GPL");
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static const struct garp_state_trans {
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u8 state;
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u8 action;
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} garp_applicant_state_table[GARP_APPLICANT_MAX + 1][GARP_EVENT_MAX + 1] = {
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[GARP_APPLICANT_VA] = {
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[GARP_EVENT_TRANSMIT_PDU] = { .state = GARP_APPLICANT_AA,
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.action = GARP_ACTION_S_JOIN_IN },
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[GARP_EVENT_R_JOIN_IN] = { .state = GARP_APPLICANT_AA },
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[GARP_EVENT_R_JOIN_EMPTY] = { .state = GARP_APPLICANT_VA },
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[GARP_EVENT_R_EMPTY] = { .state = GARP_APPLICANT_VA },
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[GARP_EVENT_R_LEAVE_IN] = { .state = GARP_APPLICANT_VA },
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[GARP_EVENT_R_LEAVE_EMPTY] = { .state = GARP_APPLICANT_VP },
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[GARP_EVENT_REQ_JOIN] = { .state = GARP_APPLICANT_INVALID },
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[GARP_EVENT_REQ_LEAVE] = { .state = GARP_APPLICANT_LA },
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},
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[GARP_APPLICANT_AA] = {
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[GARP_EVENT_TRANSMIT_PDU] = { .state = GARP_APPLICANT_QA,
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.action = GARP_ACTION_S_JOIN_IN },
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[GARP_EVENT_R_JOIN_IN] = { .state = GARP_APPLICANT_QA },
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[GARP_EVENT_R_JOIN_EMPTY] = { .state = GARP_APPLICANT_VA },
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[GARP_EVENT_R_EMPTY] = { .state = GARP_APPLICANT_VA },
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[GARP_EVENT_R_LEAVE_IN] = { .state = GARP_APPLICANT_VA },
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[GARP_EVENT_R_LEAVE_EMPTY] = { .state = GARP_APPLICANT_VP },
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[GARP_EVENT_REQ_JOIN] = { .state = GARP_APPLICANT_INVALID },
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[GARP_EVENT_REQ_LEAVE] = { .state = GARP_APPLICANT_LA },
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},
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[GARP_APPLICANT_QA] = {
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[GARP_EVENT_TRANSMIT_PDU] = { .state = GARP_APPLICANT_INVALID },
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[GARP_EVENT_R_JOIN_IN] = { .state = GARP_APPLICANT_QA },
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[GARP_EVENT_R_JOIN_EMPTY] = { .state = GARP_APPLICANT_VA },
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[GARP_EVENT_R_EMPTY] = { .state = GARP_APPLICANT_VA },
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[GARP_EVENT_R_LEAVE_IN] = { .state = GARP_APPLICANT_VP },
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[GARP_EVENT_R_LEAVE_EMPTY] = { .state = GARP_APPLICANT_VP },
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[GARP_EVENT_REQ_JOIN] = { .state = GARP_APPLICANT_INVALID },
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[GARP_EVENT_REQ_LEAVE] = { .state = GARP_APPLICANT_LA },
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},
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[GARP_APPLICANT_LA] = {
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[GARP_EVENT_TRANSMIT_PDU] = { .state = GARP_APPLICANT_VO,
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.action = GARP_ACTION_S_LEAVE_EMPTY },
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[GARP_EVENT_R_JOIN_IN] = { .state = GARP_APPLICANT_LA },
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[GARP_EVENT_R_JOIN_EMPTY] = { .state = GARP_APPLICANT_VO },
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[GARP_EVENT_R_EMPTY] = { .state = GARP_APPLICANT_LA },
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[GARP_EVENT_R_LEAVE_IN] = { .state = GARP_APPLICANT_LA },
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[GARP_EVENT_R_LEAVE_EMPTY] = { .state = GARP_APPLICANT_VO },
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[GARP_EVENT_REQ_JOIN] = { .state = GARP_APPLICANT_VA },
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[GARP_EVENT_REQ_LEAVE] = { .state = GARP_APPLICANT_INVALID },
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},
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[GARP_APPLICANT_VP] = {
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[GARP_EVENT_TRANSMIT_PDU] = { .state = GARP_APPLICANT_AA,
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.action = GARP_ACTION_S_JOIN_IN },
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[GARP_EVENT_R_JOIN_IN] = { .state = GARP_APPLICANT_AP },
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[GARP_EVENT_R_JOIN_EMPTY] = { .state = GARP_APPLICANT_VP },
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[GARP_EVENT_R_EMPTY] = { .state = GARP_APPLICANT_VP },
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[GARP_EVENT_R_LEAVE_IN] = { .state = GARP_APPLICANT_VP },
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[GARP_EVENT_R_LEAVE_EMPTY] = { .state = GARP_APPLICANT_VP },
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[GARP_EVENT_REQ_JOIN] = { .state = GARP_APPLICANT_INVALID },
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[GARP_EVENT_REQ_LEAVE] = { .state = GARP_APPLICANT_VO },
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},
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[GARP_APPLICANT_AP] = {
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[GARP_EVENT_TRANSMIT_PDU] = { .state = GARP_APPLICANT_QA,
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.action = GARP_ACTION_S_JOIN_IN },
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[GARP_EVENT_R_JOIN_IN] = { .state = GARP_APPLICANT_QP },
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[GARP_EVENT_R_JOIN_EMPTY] = { .state = GARP_APPLICANT_VP },
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[GARP_EVENT_R_EMPTY] = { .state = GARP_APPLICANT_VP },
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[GARP_EVENT_R_LEAVE_IN] = { .state = GARP_APPLICANT_VP },
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[GARP_EVENT_R_LEAVE_EMPTY] = { .state = GARP_APPLICANT_VP },
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[GARP_EVENT_REQ_JOIN] = { .state = GARP_APPLICANT_INVALID },
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[GARP_EVENT_REQ_LEAVE] = { .state = GARP_APPLICANT_AO },
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},
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[GARP_APPLICANT_QP] = {
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[GARP_EVENT_TRANSMIT_PDU] = { .state = GARP_APPLICANT_INVALID },
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[GARP_EVENT_R_JOIN_IN] = { .state = GARP_APPLICANT_QP },
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[GARP_EVENT_R_JOIN_EMPTY] = { .state = GARP_APPLICANT_VP },
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[GARP_EVENT_R_EMPTY] = { .state = GARP_APPLICANT_VP },
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[GARP_EVENT_R_LEAVE_IN] = { .state = GARP_APPLICANT_VP },
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[GARP_EVENT_R_LEAVE_EMPTY] = { .state = GARP_APPLICANT_VP },
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[GARP_EVENT_REQ_JOIN] = { .state = GARP_APPLICANT_INVALID },
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[GARP_EVENT_REQ_LEAVE] = { .state = GARP_APPLICANT_QO },
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},
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[GARP_APPLICANT_VO] = {
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[GARP_EVENT_TRANSMIT_PDU] = { .state = GARP_APPLICANT_INVALID },
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[GARP_EVENT_R_JOIN_IN] = { .state = GARP_APPLICANT_AO },
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[GARP_EVENT_R_JOIN_EMPTY] = { .state = GARP_APPLICANT_VO },
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[GARP_EVENT_R_EMPTY] = { .state = GARP_APPLICANT_VO },
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[GARP_EVENT_R_LEAVE_IN] = { .state = GARP_APPLICANT_VO },
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[GARP_EVENT_R_LEAVE_EMPTY] = { .state = GARP_APPLICANT_VO },
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[GARP_EVENT_REQ_JOIN] = { .state = GARP_APPLICANT_VP },
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[GARP_EVENT_REQ_LEAVE] = { .state = GARP_APPLICANT_INVALID },
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},
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[GARP_APPLICANT_AO] = {
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[GARP_EVENT_TRANSMIT_PDU] = { .state = GARP_APPLICANT_INVALID },
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[GARP_EVENT_R_JOIN_IN] = { .state = GARP_APPLICANT_QO },
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[GARP_EVENT_R_JOIN_EMPTY] = { .state = GARP_APPLICANT_VO },
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[GARP_EVENT_R_EMPTY] = { .state = GARP_APPLICANT_VO },
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[GARP_EVENT_R_LEAVE_IN] = { .state = GARP_APPLICANT_VO },
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[GARP_EVENT_R_LEAVE_EMPTY] = { .state = GARP_APPLICANT_VO },
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[GARP_EVENT_REQ_JOIN] = { .state = GARP_APPLICANT_AP },
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[GARP_EVENT_REQ_LEAVE] = { .state = GARP_APPLICANT_INVALID },
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},
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[GARP_APPLICANT_QO] = {
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[GARP_EVENT_TRANSMIT_PDU] = { .state = GARP_APPLICANT_INVALID },
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[GARP_EVENT_R_JOIN_IN] = { .state = GARP_APPLICANT_QO },
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[GARP_EVENT_R_JOIN_EMPTY] = { .state = GARP_APPLICANT_VO },
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[GARP_EVENT_R_EMPTY] = { .state = GARP_APPLICANT_VO },
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[GARP_EVENT_R_LEAVE_IN] = { .state = GARP_APPLICANT_VO },
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[GARP_EVENT_R_LEAVE_EMPTY] = { .state = GARP_APPLICANT_VO },
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[GARP_EVENT_REQ_JOIN] = { .state = GARP_APPLICANT_QP },
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[GARP_EVENT_REQ_LEAVE] = { .state = GARP_APPLICANT_INVALID },
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},
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};
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static int garp_attr_cmp(const struct garp_attr *attr,
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const void *data, u8 len, u8 type)
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{
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if (attr->type != type)
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return attr->type - type;
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if (attr->dlen != len)
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return attr->dlen - len;
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return memcmp(attr->data, data, len);
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}
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static struct garp_attr *garp_attr_lookup(const struct garp_applicant *app,
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const void *data, u8 len, u8 type)
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{
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struct rb_node *parent = app->gid.rb_node;
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struct garp_attr *attr;
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int d;
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while (parent) {
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attr = rb_entry(parent, struct garp_attr, node);
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d = garp_attr_cmp(attr, data, len, type);
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if (d > 0)
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parent = parent->rb_left;
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else if (d < 0)
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parent = parent->rb_right;
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else
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return attr;
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}
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return NULL;
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}
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static struct garp_attr *garp_attr_create(struct garp_applicant *app,
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const void *data, u8 len, u8 type)
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{
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struct rb_node *parent = NULL, **p = &app->gid.rb_node;
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struct garp_attr *attr;
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int d;
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while (*p) {
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parent = *p;
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attr = rb_entry(parent, struct garp_attr, node);
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d = garp_attr_cmp(attr, data, len, type);
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if (d > 0)
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p = &parent->rb_left;
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else if (d < 0)
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p = &parent->rb_right;
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else {
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/* The attribute already exists; re-use it. */
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return attr;
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}
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}
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attr = kmalloc(sizeof(*attr) + len, GFP_ATOMIC);
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if (!attr)
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return attr;
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attr->state = GARP_APPLICANT_VO;
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attr->type = type;
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attr->dlen = len;
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memcpy(attr->data, data, len);
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rb_link_node(&attr->node, parent, p);
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rb_insert_color(&attr->node, &app->gid);
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return attr;
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}
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static void garp_attr_destroy(struct garp_applicant *app, struct garp_attr *attr)
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{
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rb_erase(&attr->node, &app->gid);
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kfree(attr);
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}
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static int garp_pdu_init(struct garp_applicant *app)
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{
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struct sk_buff *skb;
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struct garp_pdu_hdr *gp;
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#define LLC_RESERVE sizeof(struct llc_pdu_un)
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skb = alloc_skb(app->dev->mtu + LL_RESERVED_SPACE(app->dev),
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GFP_ATOMIC);
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if (!skb)
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return -ENOMEM;
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skb->dev = app->dev;
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skb->protocol = htons(ETH_P_802_2);
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skb_reserve(skb, LL_RESERVED_SPACE(app->dev) + LLC_RESERVE);
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gp = (struct garp_pdu_hdr *)__skb_put(skb, sizeof(*gp));
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put_unaligned(htons(GARP_PROTOCOL_ID), &gp->protocol);
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app->pdu = skb;
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return 0;
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}
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static int garp_pdu_append_end_mark(struct garp_applicant *app)
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{
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if (skb_tailroom(app->pdu) < sizeof(u8))
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return -1;
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*(u8 *)__skb_put(app->pdu, sizeof(u8)) = GARP_END_MARK;
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return 0;
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}
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static void garp_pdu_queue(struct garp_applicant *app)
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{
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if (!app->pdu)
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return;
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garp_pdu_append_end_mark(app);
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garp_pdu_append_end_mark(app);
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llc_pdu_header_init(app->pdu, LLC_PDU_TYPE_U, LLC_SAP_BSPAN,
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LLC_SAP_BSPAN, LLC_PDU_CMD);
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llc_pdu_init_as_ui_cmd(app->pdu);
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llc_mac_hdr_init(app->pdu, app->dev->dev_addr,
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app->app->proto.group_address);
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skb_queue_tail(&app->queue, app->pdu);
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app->pdu = NULL;
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}
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static void garp_queue_xmit(struct garp_applicant *app)
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{
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struct sk_buff *skb;
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while ((skb = skb_dequeue(&app->queue)))
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dev_queue_xmit(skb);
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}
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static int garp_pdu_append_msg(struct garp_applicant *app, u8 attrtype)
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{
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struct garp_msg_hdr *gm;
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if (skb_tailroom(app->pdu) < sizeof(*gm))
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return -1;
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gm = (struct garp_msg_hdr *)__skb_put(app->pdu, sizeof(*gm));
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gm->attrtype = attrtype;
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garp_cb(app->pdu)->cur_type = attrtype;
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return 0;
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}
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static int garp_pdu_append_attr(struct garp_applicant *app,
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const struct garp_attr *attr,
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enum garp_attr_event event)
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{
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struct garp_attr_hdr *ga;
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unsigned int len;
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int err;
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again:
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if (!app->pdu) {
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err = garp_pdu_init(app);
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if (err < 0)
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return err;
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}
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if (garp_cb(app->pdu)->cur_type != attr->type) {
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if (garp_cb(app->pdu)->cur_type &&
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garp_pdu_append_end_mark(app) < 0)
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goto queue;
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if (garp_pdu_append_msg(app, attr->type) < 0)
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goto queue;
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}
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||
|
|
|
||
|
|
len = sizeof(*ga) + attr->dlen;
|
||
|
|
if (skb_tailroom(app->pdu) < len)
|
||
|
|
goto queue;
|
||
|
|
ga = (struct garp_attr_hdr *)__skb_put(app->pdu, len);
|
||
|
|
ga->len = len;
|
||
|
|
ga->event = event;
|
||
|
|
memcpy(ga->data, attr->data, attr->dlen);
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
queue:
|
||
|
|
garp_pdu_queue(app);
|
||
|
|
goto again;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void garp_attr_event(struct garp_applicant *app,
|
||
|
|
struct garp_attr *attr, enum garp_event event)
|
||
|
|
{
|
||
|
|
enum garp_applicant_state state;
|
||
|
|
|
||
|
|
state = garp_applicant_state_table[attr->state][event].state;
|
||
|
|
if (state == GARP_APPLICANT_INVALID)
|
||
|
|
return;
|
||
|
|
|
||
|
|
switch (garp_applicant_state_table[attr->state][event].action) {
|
||
|
|
case GARP_ACTION_NONE:
|
||
|
|
break;
|
||
|
|
case GARP_ACTION_S_JOIN_IN:
|
||
|
|
/* When appending the attribute fails, don't update state in
|
||
|
|
* order to retry on next TRANSMIT_PDU event. */
|
||
|
|
if (garp_pdu_append_attr(app, attr, GARP_JOIN_IN) < 0)
|
||
|
|
return;
|
||
|
|
break;
|
||
|
|
case GARP_ACTION_S_LEAVE_EMPTY:
|
||
|
|
garp_pdu_append_attr(app, attr, GARP_LEAVE_EMPTY);
|
||
|
|
/* As a pure applicant, sending a leave message implies that
|
||
|
|
* the attribute was unregistered and can be destroyed. */
|
||
|
|
garp_attr_destroy(app, attr);
|
||
|
|
return;
|
||
|
|
default:
|
||
|
|
WARN_ON(1);
|
||
|
|
}
|
||
|
|
|
||
|
|
attr->state = state;
|
||
|
|
}
|
||
|
|
|
||
|
|
int garp_request_join(const struct net_device *dev,
|
||
|
|
const struct garp_application *appl,
|
||
|
|
const void *data, u8 len, u8 type)
|
||
|
|
{
|
||
|
|
struct garp_port *port = rtnl_dereference(dev->garp_port);
|
||
|
|
struct garp_applicant *app = rtnl_dereference(port->applicants[appl->type]);
|
||
|
|
struct garp_attr *attr;
|
||
|
|
|
||
|
|
spin_lock_bh(&app->lock);
|
||
|
|
attr = garp_attr_create(app, data, len, type);
|
||
|
|
if (!attr) {
|
||
|
|
spin_unlock_bh(&app->lock);
|
||
|
|
return -ENOMEM;
|
||
|
|
}
|
||
|
|
garp_attr_event(app, attr, GARP_EVENT_REQ_JOIN);
|
||
|
|
spin_unlock_bh(&app->lock);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(garp_request_join);
|
||
|
|
|
||
|
|
void garp_request_leave(const struct net_device *dev,
|
||
|
|
const struct garp_application *appl,
|
||
|
|
const void *data, u8 len, u8 type)
|
||
|
|
{
|
||
|
|
struct garp_port *port = rtnl_dereference(dev->garp_port);
|
||
|
|
struct garp_applicant *app = rtnl_dereference(port->applicants[appl->type]);
|
||
|
|
struct garp_attr *attr;
|
||
|
|
|
||
|
|
spin_lock_bh(&app->lock);
|
||
|
|
attr = garp_attr_lookup(app, data, len, type);
|
||
|
|
if (!attr) {
|
||
|
|
spin_unlock_bh(&app->lock);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
garp_attr_event(app, attr, GARP_EVENT_REQ_LEAVE);
|
||
|
|
spin_unlock_bh(&app->lock);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(garp_request_leave);
|
||
|
|
|
||
|
|
static void garp_gid_event(struct garp_applicant *app, enum garp_event event)
|
||
|
|
{
|
||
|
|
struct rb_node *node, *next;
|
||
|
|
struct garp_attr *attr;
|
||
|
|
|
||
|
|
for (node = rb_first(&app->gid);
|
||
|
|
next = node ? rb_next(node) : NULL, node != NULL;
|
||
|
|
node = next) {
|
||
|
|
attr = rb_entry(node, struct garp_attr, node);
|
||
|
|
garp_attr_event(app, attr, event);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static void garp_join_timer_arm(struct garp_applicant *app)
|
||
|
|
{
|
||
|
|
unsigned long delay;
|
||
|
|
|
||
|
|
delay = (u64)msecs_to_jiffies(garp_join_time) * prandom_u32() >> 32;
|
||
|
|
mod_timer(&app->join_timer, jiffies + delay);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void garp_join_timer(unsigned long data)
|
||
|
|
{
|
||
|
|
struct garp_applicant *app = (struct garp_applicant *)data;
|
||
|
|
|
||
|
|
spin_lock(&app->lock);
|
||
|
|
garp_gid_event(app, GARP_EVENT_TRANSMIT_PDU);
|
||
|
|
garp_pdu_queue(app);
|
||
|
|
spin_unlock(&app->lock);
|
||
|
|
|
||
|
|
garp_queue_xmit(app);
|
||
|
|
garp_join_timer_arm(app);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int garp_pdu_parse_end_mark(struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
if (!pskb_may_pull(skb, sizeof(u8)))
|
||
|
|
return -1;
|
||
|
|
if (*skb->data == GARP_END_MARK) {
|
||
|
|
skb_pull(skb, sizeof(u8));
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int garp_pdu_parse_attr(struct garp_applicant *app, struct sk_buff *skb,
|
||
|
|
u8 attrtype)
|
||
|
|
{
|
||
|
|
const struct garp_attr_hdr *ga;
|
||
|
|
struct garp_attr *attr;
|
||
|
|
enum garp_event event;
|
||
|
|
unsigned int dlen;
|
||
|
|
|
||
|
|
if (!pskb_may_pull(skb, sizeof(*ga)))
|
||
|
|
return -1;
|
||
|
|
ga = (struct garp_attr_hdr *)skb->data;
|
||
|
|
if (ga->len < sizeof(*ga))
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
if (!pskb_may_pull(skb, ga->len))
|
||
|
|
return -1;
|
||
|
|
skb_pull(skb, ga->len);
|
||
|
|
dlen = sizeof(*ga) - ga->len;
|
||
|
|
|
||
|
|
if (attrtype > app->app->maxattr)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
switch (ga->event) {
|
||
|
|
case GARP_LEAVE_ALL:
|
||
|
|
if (dlen != 0)
|
||
|
|
return -1;
|
||
|
|
garp_gid_event(app, GARP_EVENT_R_LEAVE_EMPTY);
|
||
|
|
return 0;
|
||
|
|
case GARP_JOIN_EMPTY:
|
||
|
|
event = GARP_EVENT_R_JOIN_EMPTY;
|
||
|
|
break;
|
||
|
|
case GARP_JOIN_IN:
|
||
|
|
event = GARP_EVENT_R_JOIN_IN;
|
||
|
|
break;
|
||
|
|
case GARP_LEAVE_EMPTY:
|
||
|
|
event = GARP_EVENT_R_LEAVE_EMPTY;
|
||
|
|
break;
|
||
|
|
case GARP_EMPTY:
|
||
|
|
event = GARP_EVENT_R_EMPTY;
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (dlen == 0)
|
||
|
|
return -1;
|
||
|
|
attr = garp_attr_lookup(app, ga->data, dlen, attrtype);
|
||
|
|
if (attr == NULL)
|
||
|
|
return 0;
|
||
|
|
garp_attr_event(app, attr, event);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int garp_pdu_parse_msg(struct garp_applicant *app, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
const struct garp_msg_hdr *gm;
|
||
|
|
|
||
|
|
if (!pskb_may_pull(skb, sizeof(*gm)))
|
||
|
|
return -1;
|
||
|
|
gm = (struct garp_msg_hdr *)skb->data;
|
||
|
|
if (gm->attrtype == 0)
|
||
|
|
return -1;
|
||
|
|
skb_pull(skb, sizeof(*gm));
|
||
|
|
|
||
|
|
while (skb->len > 0) {
|
||
|
|
if (garp_pdu_parse_attr(app, skb, gm->attrtype) < 0)
|
||
|
|
return -1;
|
||
|
|
if (garp_pdu_parse_end_mark(skb) < 0)
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void garp_pdu_rcv(const struct stp_proto *proto, struct sk_buff *skb,
|
||
|
|
struct net_device *dev)
|
||
|
|
{
|
||
|
|
struct garp_application *appl = proto->data;
|
||
|
|
struct garp_port *port;
|
||
|
|
struct garp_applicant *app;
|
||
|
|
const struct garp_pdu_hdr *gp;
|
||
|
|
|
||
|
|
port = rcu_dereference(dev->garp_port);
|
||
|
|
if (!port)
|
||
|
|
goto err;
|
||
|
|
app = rcu_dereference(port->applicants[appl->type]);
|
||
|
|
if (!app)
|
||
|
|
goto err;
|
||
|
|
|
||
|
|
if (!pskb_may_pull(skb, sizeof(*gp)))
|
||
|
|
goto err;
|
||
|
|
gp = (struct garp_pdu_hdr *)skb->data;
|
||
|
|
if (get_unaligned(&gp->protocol) != htons(GARP_PROTOCOL_ID))
|
||
|
|
goto err;
|
||
|
|
skb_pull(skb, sizeof(*gp));
|
||
|
|
|
||
|
|
spin_lock(&app->lock);
|
||
|
|
while (skb->len > 0) {
|
||
|
|
if (garp_pdu_parse_msg(app, skb) < 0)
|
||
|
|
break;
|
||
|
|
if (garp_pdu_parse_end_mark(skb) < 0)
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
spin_unlock(&app->lock);
|
||
|
|
err:
|
||
|
|
kfree_skb(skb);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int garp_init_port(struct net_device *dev)
|
||
|
|
{
|
||
|
|
struct garp_port *port;
|
||
|
|
|
||
|
|
port = kzalloc(sizeof(*port), GFP_KERNEL);
|
||
|
|
if (!port)
|
||
|
|
return -ENOMEM;
|
||
|
|
rcu_assign_pointer(dev->garp_port, port);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void garp_release_port(struct net_device *dev)
|
||
|
|
{
|
||
|
|
struct garp_port *port = rtnl_dereference(dev->garp_port);
|
||
|
|
unsigned int i;
|
||
|
|
|
||
|
|
for (i = 0; i <= GARP_APPLICATION_MAX; i++) {
|
||
|
|
if (rtnl_dereference(port->applicants[i]))
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
RCU_INIT_POINTER(dev->garp_port, NULL);
|
||
|
|
kfree_rcu(port, rcu);
|
||
|
|
}
|
||
|
|
|
||
|
|
int garp_init_applicant(struct net_device *dev, struct garp_application *appl)
|
||
|
|
{
|
||
|
|
struct garp_applicant *app;
|
||
|
|
int err;
|
||
|
|
|
||
|
|
ASSERT_RTNL();
|
||
|
|
|
||
|
|
if (!rtnl_dereference(dev->garp_port)) {
|
||
|
|
err = garp_init_port(dev);
|
||
|
|
if (err < 0)
|
||
|
|
goto err1;
|
||
|
|
}
|
||
|
|
|
||
|
|
err = -ENOMEM;
|
||
|
|
app = kzalloc(sizeof(*app), GFP_KERNEL);
|
||
|
|
if (!app)
|
||
|
|
goto err2;
|
||
|
|
|
||
|
|
err = dev_mc_add(dev, appl->proto.group_address);
|
||
|
|
if (err < 0)
|
||
|
|
goto err3;
|
||
|
|
|
||
|
|
app->dev = dev;
|
||
|
|
app->app = appl;
|
||
|
|
app->gid = RB_ROOT;
|
||
|
|
spin_lock_init(&app->lock);
|
||
|
|
skb_queue_head_init(&app->queue);
|
||
|
|
rcu_assign_pointer(dev->garp_port->applicants[appl->type], app);
|
||
|
|
setup_timer(&app->join_timer, garp_join_timer, (unsigned long)app);
|
||
|
|
garp_join_timer_arm(app);
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
err3:
|
||
|
|
kfree(app);
|
||
|
|
err2:
|
||
|
|
garp_release_port(dev);
|
||
|
|
err1:
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(garp_init_applicant);
|
||
|
|
|
||
|
|
void garp_uninit_applicant(struct net_device *dev, struct garp_application *appl)
|
||
|
|
{
|
||
|
|
struct garp_port *port = rtnl_dereference(dev->garp_port);
|
||
|
|
struct garp_applicant *app = rtnl_dereference(port->applicants[appl->type]);
|
||
|
|
|
||
|
|
ASSERT_RTNL();
|
||
|
|
|
||
|
|
RCU_INIT_POINTER(port->applicants[appl->type], NULL);
|
||
|
|
|
||
|
|
/* Delete timer and generate a final TRANSMIT_PDU event to flush out
|
||
|
|
* all pending messages before the applicant is gone. */
|
||
|
|
del_timer_sync(&app->join_timer);
|
||
|
|
|
||
|
|
spin_lock_bh(&app->lock);
|
||
|
|
garp_gid_event(app, GARP_EVENT_TRANSMIT_PDU);
|
||
|
|
garp_pdu_queue(app);
|
||
|
|
spin_unlock_bh(&app->lock);
|
||
|
|
|
||
|
|
garp_queue_xmit(app);
|
||
|
|
|
||
|
|
dev_mc_del(dev, appl->proto.group_address);
|
||
|
|
kfree_rcu(app, rcu);
|
||
|
|
garp_release_port(dev);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(garp_uninit_applicant);
|
||
|
|
|
||
|
|
int garp_register_application(struct garp_application *appl)
|
||
|
|
{
|
||
|
|
appl->proto.rcv = garp_pdu_rcv;
|
||
|
|
appl->proto.data = appl;
|
||
|
|
return stp_proto_register(&appl->proto);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(garp_register_application);
|
||
|
|
|
||
|
|
void garp_unregister_application(struct garp_application *appl)
|
||
|
|
{
|
||
|
|
stp_proto_unregister(&appl->proto);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(garp_unregister_application);
|