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292a089d78
Due to several bugs caused by timers being re-armed after they are shutdown and just before they are freed, a new state of timers was added called "shutdown". After a timer is set to this state, then it can no longer be re-armed. The following script was run to find all the trivial locations where del_timer() or del_timer_sync() is called in the same function that the object holding the timer is freed. It also ignores any locations where the timer->function is modified between the del_timer*() and the free(), as that is not considered a "trivial" case. This was created by using a coccinelle script and the following commands: $ cat timer.cocci @@ expression ptr, slab; identifier timer, rfield; @@ ( - del_timer(&ptr->timer); + timer_shutdown(&ptr->timer); | - del_timer_sync(&ptr->timer); + timer_shutdown_sync(&ptr->timer); ) ... when strict when != ptr->timer ( kfree_rcu(ptr, rfield); | kmem_cache_free(slab, ptr); | kfree(ptr); ) $ spatch timer.cocci . > /tmp/t.patch $ patch -p1 < /tmp/t.patch Link: https://lore.kernel.org/lkml/20221123201306.823305113@linutronix.de/ Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org> Acked-by: Pavel Machek <pavel@ucw.cz> [ LED ] Acked-by: Kalle Valo <kvalo@kernel.org> [ wireless ] Acked-by: Paolo Abeni <pabeni@redhat.com> [ networking ] Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
944 lines
25 KiB
C
944 lines
25 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* IEEE 802.1Q Multiple Registration Protocol (MRP)
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*
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* Copyright (c) 2012 Massachusetts Institute of Technology
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*
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* Adapted from code in net/802/garp.c
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* Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
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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/slab.h>
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#include <linux/module.h>
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#include <net/mrp.h>
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#include <asm/unaligned.h>
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static unsigned int mrp_join_time __read_mostly = 200;
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module_param(mrp_join_time, uint, 0644);
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MODULE_PARM_DESC(mrp_join_time, "Join time in ms (default 200ms)");
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static unsigned int mrp_periodic_time __read_mostly = 1000;
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module_param(mrp_periodic_time, uint, 0644);
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MODULE_PARM_DESC(mrp_periodic_time, "Periodic time in ms (default 1s)");
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MODULE_LICENSE("GPL");
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static const u8
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mrp_applicant_state_table[MRP_APPLICANT_MAX + 1][MRP_EVENT_MAX + 1] = {
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[MRP_APPLICANT_VO] = {
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[MRP_EVENT_NEW] = MRP_APPLICANT_VN,
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[MRP_EVENT_JOIN] = MRP_APPLICANT_VP,
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[MRP_EVENT_LV] = MRP_APPLICANT_VO,
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[MRP_EVENT_TX] = MRP_APPLICANT_VO,
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[MRP_EVENT_R_NEW] = MRP_APPLICANT_VO,
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[MRP_EVENT_R_JOIN_IN] = MRP_APPLICANT_AO,
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[MRP_EVENT_R_IN] = MRP_APPLICANT_VO,
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[MRP_EVENT_R_JOIN_MT] = MRP_APPLICANT_VO,
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[MRP_EVENT_R_MT] = MRP_APPLICANT_VO,
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[MRP_EVENT_R_LV] = MRP_APPLICANT_VO,
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[MRP_EVENT_R_LA] = MRP_APPLICANT_VO,
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[MRP_EVENT_REDECLARE] = MRP_APPLICANT_VO,
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[MRP_EVENT_PERIODIC] = MRP_APPLICANT_VO,
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},
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[MRP_APPLICANT_VP] = {
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[MRP_EVENT_NEW] = MRP_APPLICANT_VN,
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[MRP_EVENT_JOIN] = MRP_APPLICANT_VP,
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[MRP_EVENT_LV] = MRP_APPLICANT_VO,
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[MRP_EVENT_TX] = MRP_APPLICANT_AA,
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[MRP_EVENT_R_NEW] = MRP_APPLICANT_VP,
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[MRP_EVENT_R_JOIN_IN] = MRP_APPLICANT_AP,
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[MRP_EVENT_R_IN] = MRP_APPLICANT_VP,
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[MRP_EVENT_R_JOIN_MT] = MRP_APPLICANT_VP,
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[MRP_EVENT_R_MT] = MRP_APPLICANT_VP,
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[MRP_EVENT_R_LV] = MRP_APPLICANT_VP,
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[MRP_EVENT_R_LA] = MRP_APPLICANT_VP,
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[MRP_EVENT_REDECLARE] = MRP_APPLICANT_VP,
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[MRP_EVENT_PERIODIC] = MRP_APPLICANT_VP,
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},
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[MRP_APPLICANT_VN] = {
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[MRP_EVENT_NEW] = MRP_APPLICANT_VN,
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[MRP_EVENT_JOIN] = MRP_APPLICANT_VN,
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[MRP_EVENT_LV] = MRP_APPLICANT_LA,
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[MRP_EVENT_TX] = MRP_APPLICANT_AN,
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[MRP_EVENT_R_NEW] = MRP_APPLICANT_VN,
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[MRP_EVENT_R_JOIN_IN] = MRP_APPLICANT_VN,
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[MRP_EVENT_R_IN] = MRP_APPLICANT_VN,
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[MRP_EVENT_R_JOIN_MT] = MRP_APPLICANT_VN,
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[MRP_EVENT_R_MT] = MRP_APPLICANT_VN,
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[MRP_EVENT_R_LV] = MRP_APPLICANT_VN,
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[MRP_EVENT_R_LA] = MRP_APPLICANT_VN,
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[MRP_EVENT_REDECLARE] = MRP_APPLICANT_VN,
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[MRP_EVENT_PERIODIC] = MRP_APPLICANT_VN,
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},
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[MRP_APPLICANT_AN] = {
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[MRP_EVENT_NEW] = MRP_APPLICANT_AN,
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[MRP_EVENT_JOIN] = MRP_APPLICANT_AN,
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[MRP_EVENT_LV] = MRP_APPLICANT_LA,
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[MRP_EVENT_TX] = MRP_APPLICANT_QA,
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[MRP_EVENT_R_NEW] = MRP_APPLICANT_AN,
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[MRP_EVENT_R_JOIN_IN] = MRP_APPLICANT_AN,
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[MRP_EVENT_R_IN] = MRP_APPLICANT_AN,
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[MRP_EVENT_R_JOIN_MT] = MRP_APPLICANT_AN,
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[MRP_EVENT_R_MT] = MRP_APPLICANT_AN,
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[MRP_EVENT_R_LV] = MRP_APPLICANT_VN,
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[MRP_EVENT_R_LA] = MRP_APPLICANT_VN,
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[MRP_EVENT_REDECLARE] = MRP_APPLICANT_VN,
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[MRP_EVENT_PERIODIC] = MRP_APPLICANT_AN,
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},
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[MRP_APPLICANT_AA] = {
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[MRP_EVENT_NEW] = MRP_APPLICANT_VN,
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[MRP_EVENT_JOIN] = MRP_APPLICANT_AA,
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[MRP_EVENT_LV] = MRP_APPLICANT_LA,
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[MRP_EVENT_TX] = MRP_APPLICANT_QA,
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[MRP_EVENT_R_NEW] = MRP_APPLICANT_AA,
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[MRP_EVENT_R_JOIN_IN] = MRP_APPLICANT_QA,
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[MRP_EVENT_R_IN] = MRP_APPLICANT_AA,
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[MRP_EVENT_R_JOIN_MT] = MRP_APPLICANT_AA,
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[MRP_EVENT_R_MT] = MRP_APPLICANT_AA,
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[MRP_EVENT_R_LV] = MRP_APPLICANT_VP,
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[MRP_EVENT_R_LA] = MRP_APPLICANT_VP,
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[MRP_EVENT_REDECLARE] = MRP_APPLICANT_VP,
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[MRP_EVENT_PERIODIC] = MRP_APPLICANT_AA,
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},
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[MRP_APPLICANT_QA] = {
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[MRP_EVENT_NEW] = MRP_APPLICANT_VN,
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[MRP_EVENT_JOIN] = MRP_APPLICANT_QA,
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[MRP_EVENT_LV] = MRP_APPLICANT_LA,
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[MRP_EVENT_TX] = MRP_APPLICANT_QA,
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[MRP_EVENT_R_NEW] = MRP_APPLICANT_QA,
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[MRP_EVENT_R_JOIN_IN] = MRP_APPLICANT_QA,
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[MRP_EVENT_R_IN] = MRP_APPLICANT_QA,
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[MRP_EVENT_R_JOIN_MT] = MRP_APPLICANT_AA,
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[MRP_EVENT_R_MT] = MRP_APPLICANT_AA,
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[MRP_EVENT_R_LV] = MRP_APPLICANT_VP,
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[MRP_EVENT_R_LA] = MRP_APPLICANT_VP,
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[MRP_EVENT_REDECLARE] = MRP_APPLICANT_VP,
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[MRP_EVENT_PERIODIC] = MRP_APPLICANT_AA,
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},
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[MRP_APPLICANT_LA] = {
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[MRP_EVENT_NEW] = MRP_APPLICANT_VN,
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[MRP_EVENT_JOIN] = MRP_APPLICANT_AA,
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[MRP_EVENT_LV] = MRP_APPLICANT_LA,
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[MRP_EVENT_TX] = MRP_APPLICANT_VO,
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[MRP_EVENT_R_NEW] = MRP_APPLICANT_LA,
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[MRP_EVENT_R_JOIN_IN] = MRP_APPLICANT_LA,
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[MRP_EVENT_R_IN] = MRP_APPLICANT_LA,
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[MRP_EVENT_R_JOIN_MT] = MRP_APPLICANT_LA,
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[MRP_EVENT_R_MT] = MRP_APPLICANT_LA,
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[MRP_EVENT_R_LV] = MRP_APPLICANT_LA,
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[MRP_EVENT_R_LA] = MRP_APPLICANT_LA,
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[MRP_EVENT_REDECLARE] = MRP_APPLICANT_LA,
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[MRP_EVENT_PERIODIC] = MRP_APPLICANT_LA,
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},
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[MRP_APPLICANT_AO] = {
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[MRP_EVENT_NEW] = MRP_APPLICANT_VN,
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[MRP_EVENT_JOIN] = MRP_APPLICANT_AP,
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[MRP_EVENT_LV] = MRP_APPLICANT_AO,
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[MRP_EVENT_TX] = MRP_APPLICANT_AO,
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[MRP_EVENT_R_NEW] = MRP_APPLICANT_AO,
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[MRP_EVENT_R_JOIN_IN] = MRP_APPLICANT_QO,
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[MRP_EVENT_R_IN] = MRP_APPLICANT_AO,
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[MRP_EVENT_R_JOIN_MT] = MRP_APPLICANT_AO,
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[MRP_EVENT_R_MT] = MRP_APPLICANT_AO,
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[MRP_EVENT_R_LV] = MRP_APPLICANT_VO,
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[MRP_EVENT_R_LA] = MRP_APPLICANT_VO,
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[MRP_EVENT_REDECLARE] = MRP_APPLICANT_VO,
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[MRP_EVENT_PERIODIC] = MRP_APPLICANT_AO,
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},
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[MRP_APPLICANT_QO] = {
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[MRP_EVENT_NEW] = MRP_APPLICANT_VN,
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[MRP_EVENT_JOIN] = MRP_APPLICANT_QP,
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[MRP_EVENT_LV] = MRP_APPLICANT_QO,
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[MRP_EVENT_TX] = MRP_APPLICANT_QO,
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[MRP_EVENT_R_NEW] = MRP_APPLICANT_QO,
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[MRP_EVENT_R_JOIN_IN] = MRP_APPLICANT_QO,
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[MRP_EVENT_R_IN] = MRP_APPLICANT_QO,
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[MRP_EVENT_R_JOIN_MT] = MRP_APPLICANT_AO,
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[MRP_EVENT_R_MT] = MRP_APPLICANT_AO,
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[MRP_EVENT_R_LV] = MRP_APPLICANT_VO,
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[MRP_EVENT_R_LA] = MRP_APPLICANT_VO,
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[MRP_EVENT_REDECLARE] = MRP_APPLICANT_VO,
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[MRP_EVENT_PERIODIC] = MRP_APPLICANT_QO,
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},
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[MRP_APPLICANT_AP] = {
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[MRP_EVENT_NEW] = MRP_APPLICANT_VN,
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[MRP_EVENT_JOIN] = MRP_APPLICANT_AP,
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[MRP_EVENT_LV] = MRP_APPLICANT_AO,
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[MRP_EVENT_TX] = MRP_APPLICANT_QA,
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[MRP_EVENT_R_NEW] = MRP_APPLICANT_AP,
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[MRP_EVENT_R_JOIN_IN] = MRP_APPLICANT_QP,
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[MRP_EVENT_R_IN] = MRP_APPLICANT_AP,
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[MRP_EVENT_R_JOIN_MT] = MRP_APPLICANT_AP,
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[MRP_EVENT_R_MT] = MRP_APPLICANT_AP,
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[MRP_EVENT_R_LV] = MRP_APPLICANT_VP,
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[MRP_EVENT_R_LA] = MRP_APPLICANT_VP,
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[MRP_EVENT_REDECLARE] = MRP_APPLICANT_VP,
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[MRP_EVENT_PERIODIC] = MRP_APPLICANT_AP,
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},
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[MRP_APPLICANT_QP] = {
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[MRP_EVENT_NEW] = MRP_APPLICANT_VN,
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[MRP_EVENT_JOIN] = MRP_APPLICANT_QP,
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[MRP_EVENT_LV] = MRP_APPLICANT_QO,
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[MRP_EVENT_TX] = MRP_APPLICANT_QP,
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[MRP_EVENT_R_NEW] = MRP_APPLICANT_QP,
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[MRP_EVENT_R_JOIN_IN] = MRP_APPLICANT_QP,
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[MRP_EVENT_R_IN] = MRP_APPLICANT_QP,
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[MRP_EVENT_R_JOIN_MT] = MRP_APPLICANT_AP,
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[MRP_EVENT_R_MT] = MRP_APPLICANT_AP,
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[MRP_EVENT_R_LV] = MRP_APPLICANT_VP,
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[MRP_EVENT_R_LA] = MRP_APPLICANT_VP,
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[MRP_EVENT_REDECLARE] = MRP_APPLICANT_VP,
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[MRP_EVENT_PERIODIC] = MRP_APPLICANT_AP,
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},
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};
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static const u8
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mrp_tx_action_table[MRP_APPLICANT_MAX + 1] = {
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[MRP_APPLICANT_VO] = MRP_TX_ACTION_S_IN_OPTIONAL,
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[MRP_APPLICANT_VP] = MRP_TX_ACTION_S_JOIN_IN,
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[MRP_APPLICANT_VN] = MRP_TX_ACTION_S_NEW,
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[MRP_APPLICANT_AN] = MRP_TX_ACTION_S_NEW,
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[MRP_APPLICANT_AA] = MRP_TX_ACTION_S_JOIN_IN,
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[MRP_APPLICANT_QA] = MRP_TX_ACTION_S_JOIN_IN_OPTIONAL,
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[MRP_APPLICANT_LA] = MRP_TX_ACTION_S_LV,
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[MRP_APPLICANT_AO] = MRP_TX_ACTION_S_IN_OPTIONAL,
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[MRP_APPLICANT_QO] = MRP_TX_ACTION_S_IN_OPTIONAL,
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[MRP_APPLICANT_AP] = MRP_TX_ACTION_S_JOIN_IN,
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[MRP_APPLICANT_QP] = MRP_TX_ACTION_S_IN_OPTIONAL,
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};
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static void mrp_attrvalue_inc(void *value, u8 len)
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{
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u8 *v = (u8 *)value;
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/* Add 1 to the last byte. If it becomes zero,
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* go to the previous byte and repeat.
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*/
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while (len > 0 && !++v[--len])
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;
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}
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static int mrp_attr_cmp(const struct mrp_attr *attr,
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const void *value, 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->len != len)
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return attr->len - len;
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return memcmp(attr->value, value, len);
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}
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static struct mrp_attr *mrp_attr_lookup(const struct mrp_applicant *app,
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const void *value, u8 len, u8 type)
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{
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struct rb_node *parent = app->mad.rb_node;
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struct mrp_attr *attr;
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int d;
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while (parent) {
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attr = rb_entry(parent, struct mrp_attr, node);
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d = mrp_attr_cmp(attr, value, 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 mrp_attr *mrp_attr_create(struct mrp_applicant *app,
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const void *value, u8 len, u8 type)
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{
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struct rb_node *parent = NULL, **p = &app->mad.rb_node;
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struct mrp_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 mrp_attr, node);
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d = mrp_attr_cmp(attr, value, 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 = MRP_APPLICANT_VO;
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attr->type = type;
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attr->len = len;
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memcpy(attr->value, value, len);
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rb_link_node(&attr->node, parent, p);
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rb_insert_color(&attr->node, &app->mad);
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return attr;
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}
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static void mrp_attr_destroy(struct mrp_applicant *app, struct mrp_attr *attr)
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{
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rb_erase(&attr->node, &app->mad);
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kfree(attr);
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}
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static void mrp_attr_destroy_all(struct mrp_applicant *app)
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{
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struct rb_node *node, *next;
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struct mrp_attr *attr;
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for (node = rb_first(&app->mad);
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next = node ? rb_next(node) : NULL, node != NULL;
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node = next) {
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attr = rb_entry(node, struct mrp_attr, node);
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mrp_attr_destroy(app, attr);
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}
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}
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static int mrp_pdu_init(struct mrp_applicant *app)
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{
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struct sk_buff *skb;
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struct mrp_pdu_hdr *ph;
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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 = app->app->pkttype.type;
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skb_reserve(skb, LL_RESERVED_SPACE(app->dev));
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skb_reset_network_header(skb);
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skb_reset_transport_header(skb);
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ph = __skb_put(skb, sizeof(*ph));
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ph->version = app->app->version;
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app->pdu = skb;
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return 0;
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}
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static int mrp_pdu_append_end_mark(struct mrp_applicant *app)
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{
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__be16 *endmark;
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if (skb_tailroom(app->pdu) < sizeof(*endmark))
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return -1;
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endmark = __skb_put(app->pdu, sizeof(*endmark));
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put_unaligned(MRP_END_MARK, endmark);
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return 0;
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}
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static void mrp_pdu_queue(struct mrp_applicant *app)
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{
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if (!app->pdu)
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return;
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if (mrp_cb(app->pdu)->mh)
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mrp_pdu_append_end_mark(app);
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mrp_pdu_append_end_mark(app);
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dev_hard_header(app->pdu, app->dev, ntohs(app->app->pkttype.type),
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app->app->group_address, app->dev->dev_addr,
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|
app->pdu->len);
|
|
|
|
skb_queue_tail(&app->queue, app->pdu);
|
|
app->pdu = NULL;
|
|
}
|
|
|
|
static void mrp_queue_xmit(struct mrp_applicant *app)
|
|
{
|
|
struct sk_buff *skb;
|
|
|
|
while ((skb = skb_dequeue(&app->queue)))
|
|
dev_queue_xmit(skb);
|
|
}
|
|
|
|
static int mrp_pdu_append_msg_hdr(struct mrp_applicant *app,
|
|
u8 attrtype, u8 attrlen)
|
|
{
|
|
struct mrp_msg_hdr *mh;
|
|
|
|
if (mrp_cb(app->pdu)->mh) {
|
|
if (mrp_pdu_append_end_mark(app) < 0)
|
|
return -1;
|
|
mrp_cb(app->pdu)->mh = NULL;
|
|
mrp_cb(app->pdu)->vah = NULL;
|
|
}
|
|
|
|
if (skb_tailroom(app->pdu) < sizeof(*mh))
|
|
return -1;
|
|
mh = __skb_put(app->pdu, sizeof(*mh));
|
|
mh->attrtype = attrtype;
|
|
mh->attrlen = attrlen;
|
|
mrp_cb(app->pdu)->mh = mh;
|
|
return 0;
|
|
}
|
|
|
|
static int mrp_pdu_append_vecattr_hdr(struct mrp_applicant *app,
|
|
const void *firstattrvalue, u8 attrlen)
|
|
{
|
|
struct mrp_vecattr_hdr *vah;
|
|
|
|
if (skb_tailroom(app->pdu) < sizeof(*vah) + attrlen)
|
|
return -1;
|
|
vah = __skb_put(app->pdu, sizeof(*vah) + attrlen);
|
|
put_unaligned(0, &vah->lenflags);
|
|
memcpy(vah->firstattrvalue, firstattrvalue, attrlen);
|
|
mrp_cb(app->pdu)->vah = vah;
|
|
memcpy(mrp_cb(app->pdu)->attrvalue, firstattrvalue, attrlen);
|
|
return 0;
|
|
}
|
|
|
|
static int mrp_pdu_append_vecattr_event(struct mrp_applicant *app,
|
|
const struct mrp_attr *attr,
|
|
enum mrp_vecattr_event vaevent)
|
|
{
|
|
u16 len, pos;
|
|
u8 *vaevents;
|
|
int err;
|
|
again:
|
|
if (!app->pdu) {
|
|
err = mrp_pdu_init(app);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
/* If there is no Message header in the PDU, or the Message header is
|
|
* for a different attribute type, add an EndMark (if necessary) and a
|
|
* new Message header to the PDU.
|
|
*/
|
|
if (!mrp_cb(app->pdu)->mh ||
|
|
mrp_cb(app->pdu)->mh->attrtype != attr->type ||
|
|
mrp_cb(app->pdu)->mh->attrlen != attr->len) {
|
|
if (mrp_pdu_append_msg_hdr(app, attr->type, attr->len) < 0)
|
|
goto queue;
|
|
}
|
|
|
|
/* If there is no VectorAttribute header for this Message in the PDU,
|
|
* or this attribute's value does not sequentially follow the previous
|
|
* attribute's value, add a new VectorAttribute header to the PDU.
|
|
*/
|
|
if (!mrp_cb(app->pdu)->vah ||
|
|
memcmp(mrp_cb(app->pdu)->attrvalue, attr->value, attr->len)) {
|
|
if (mrp_pdu_append_vecattr_hdr(app, attr->value, attr->len) < 0)
|
|
goto queue;
|
|
}
|
|
|
|
len = be16_to_cpu(get_unaligned(&mrp_cb(app->pdu)->vah->lenflags));
|
|
pos = len % 3;
|
|
|
|
/* Events are packed into Vectors in the PDU, three to a byte. Add a
|
|
* byte to the end of the Vector if necessary.
|
|
*/
|
|
if (!pos) {
|
|
if (skb_tailroom(app->pdu) < sizeof(u8))
|
|
goto queue;
|
|
vaevents = __skb_put(app->pdu, sizeof(u8));
|
|
} else {
|
|
vaevents = (u8 *)(skb_tail_pointer(app->pdu) - sizeof(u8));
|
|
}
|
|
|
|
switch (pos) {
|
|
case 0:
|
|
*vaevents = vaevent * (__MRP_VECATTR_EVENT_MAX *
|
|
__MRP_VECATTR_EVENT_MAX);
|
|
break;
|
|
case 1:
|
|
*vaevents += vaevent * __MRP_VECATTR_EVENT_MAX;
|
|
break;
|
|
case 2:
|
|
*vaevents += vaevent;
|
|
break;
|
|
default:
|
|
WARN_ON(1);
|
|
}
|
|
|
|
/* Increment the length of the VectorAttribute in the PDU, as well as
|
|
* the value of the next attribute that would continue its Vector.
|
|
*/
|
|
put_unaligned(cpu_to_be16(++len), &mrp_cb(app->pdu)->vah->lenflags);
|
|
mrp_attrvalue_inc(mrp_cb(app->pdu)->attrvalue, attr->len);
|
|
|
|
return 0;
|
|
|
|
queue:
|
|
mrp_pdu_queue(app);
|
|
goto again;
|
|
}
|
|
|
|
static void mrp_attr_event(struct mrp_applicant *app,
|
|
struct mrp_attr *attr, enum mrp_event event)
|
|
{
|
|
enum mrp_applicant_state state;
|
|
|
|
state = mrp_applicant_state_table[attr->state][event];
|
|
if (state == MRP_APPLICANT_INVALID) {
|
|
WARN_ON(1);
|
|
return;
|
|
}
|
|
|
|
if (event == MRP_EVENT_TX) {
|
|
/* When appending the attribute fails, don't update its state
|
|
* in order to retry at the next TX event.
|
|
*/
|
|
|
|
switch (mrp_tx_action_table[attr->state]) {
|
|
case MRP_TX_ACTION_NONE:
|
|
case MRP_TX_ACTION_S_JOIN_IN_OPTIONAL:
|
|
case MRP_TX_ACTION_S_IN_OPTIONAL:
|
|
break;
|
|
case MRP_TX_ACTION_S_NEW:
|
|
if (mrp_pdu_append_vecattr_event(
|
|
app, attr, MRP_VECATTR_EVENT_NEW) < 0)
|
|
return;
|
|
break;
|
|
case MRP_TX_ACTION_S_JOIN_IN:
|
|
if (mrp_pdu_append_vecattr_event(
|
|
app, attr, MRP_VECATTR_EVENT_JOIN_IN) < 0)
|
|
return;
|
|
break;
|
|
case MRP_TX_ACTION_S_LV:
|
|
if (mrp_pdu_append_vecattr_event(
|
|
app, attr, MRP_VECATTR_EVENT_LV) < 0)
|
|
return;
|
|
/* As a pure applicant, sending a leave message
|
|
* implies that the attribute was unregistered and
|
|
* can be destroyed.
|
|
*/
|
|
mrp_attr_destroy(app, attr);
|
|
return;
|
|
default:
|
|
WARN_ON(1);
|
|
}
|
|
}
|
|
|
|
attr->state = state;
|
|
}
|
|
|
|
int mrp_request_join(const struct net_device *dev,
|
|
const struct mrp_application *appl,
|
|
const void *value, u8 len, u8 type)
|
|
{
|
|
struct mrp_port *port = rtnl_dereference(dev->mrp_port);
|
|
struct mrp_applicant *app = rtnl_dereference(
|
|
port->applicants[appl->type]);
|
|
struct mrp_attr *attr;
|
|
|
|
if (sizeof(struct mrp_skb_cb) + len >
|
|
sizeof_field(struct sk_buff, cb))
|
|
return -ENOMEM;
|
|
|
|
spin_lock_bh(&app->lock);
|
|
attr = mrp_attr_create(app, value, len, type);
|
|
if (!attr) {
|
|
spin_unlock_bh(&app->lock);
|
|
return -ENOMEM;
|
|
}
|
|
mrp_attr_event(app, attr, MRP_EVENT_JOIN);
|
|
spin_unlock_bh(&app->lock);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mrp_request_join);
|
|
|
|
void mrp_request_leave(const struct net_device *dev,
|
|
const struct mrp_application *appl,
|
|
const void *value, u8 len, u8 type)
|
|
{
|
|
struct mrp_port *port = rtnl_dereference(dev->mrp_port);
|
|
struct mrp_applicant *app = rtnl_dereference(
|
|
port->applicants[appl->type]);
|
|
struct mrp_attr *attr;
|
|
|
|
if (sizeof(struct mrp_skb_cb) + len >
|
|
sizeof_field(struct sk_buff, cb))
|
|
return;
|
|
|
|
spin_lock_bh(&app->lock);
|
|
attr = mrp_attr_lookup(app, value, len, type);
|
|
if (!attr) {
|
|
spin_unlock_bh(&app->lock);
|
|
return;
|
|
}
|
|
mrp_attr_event(app, attr, MRP_EVENT_LV);
|
|
spin_unlock_bh(&app->lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(mrp_request_leave);
|
|
|
|
static void mrp_mad_event(struct mrp_applicant *app, enum mrp_event event)
|
|
{
|
|
struct rb_node *node, *next;
|
|
struct mrp_attr *attr;
|
|
|
|
for (node = rb_first(&app->mad);
|
|
next = node ? rb_next(node) : NULL, node != NULL;
|
|
node = next) {
|
|
attr = rb_entry(node, struct mrp_attr, node);
|
|
mrp_attr_event(app, attr, event);
|
|
}
|
|
}
|
|
|
|
static void mrp_join_timer_arm(struct mrp_applicant *app)
|
|
{
|
|
unsigned long delay;
|
|
|
|
delay = get_random_u32_below(msecs_to_jiffies(mrp_join_time));
|
|
mod_timer(&app->join_timer, jiffies + delay);
|
|
}
|
|
|
|
static void mrp_join_timer(struct timer_list *t)
|
|
{
|
|
struct mrp_applicant *app = from_timer(app, t, join_timer);
|
|
|
|
spin_lock(&app->lock);
|
|
mrp_mad_event(app, MRP_EVENT_TX);
|
|
mrp_pdu_queue(app);
|
|
spin_unlock(&app->lock);
|
|
|
|
mrp_queue_xmit(app);
|
|
spin_lock(&app->lock);
|
|
if (likely(app->active))
|
|
mrp_join_timer_arm(app);
|
|
spin_unlock(&app->lock);
|
|
}
|
|
|
|
static void mrp_periodic_timer_arm(struct mrp_applicant *app)
|
|
{
|
|
mod_timer(&app->periodic_timer,
|
|
jiffies + msecs_to_jiffies(mrp_periodic_time));
|
|
}
|
|
|
|
static void mrp_periodic_timer(struct timer_list *t)
|
|
{
|
|
struct mrp_applicant *app = from_timer(app, t, periodic_timer);
|
|
|
|
spin_lock(&app->lock);
|
|
if (likely(app->active)) {
|
|
mrp_mad_event(app, MRP_EVENT_PERIODIC);
|
|
mrp_pdu_queue(app);
|
|
mrp_periodic_timer_arm(app);
|
|
}
|
|
spin_unlock(&app->lock);
|
|
}
|
|
|
|
static int mrp_pdu_parse_end_mark(struct sk_buff *skb, int *offset)
|
|
{
|
|
__be16 endmark;
|
|
|
|
if (skb_copy_bits(skb, *offset, &endmark, sizeof(endmark)) < 0)
|
|
return -1;
|
|
if (endmark == MRP_END_MARK) {
|
|
*offset += sizeof(endmark);
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void mrp_pdu_parse_vecattr_event(struct mrp_applicant *app,
|
|
struct sk_buff *skb,
|
|
enum mrp_vecattr_event vaevent)
|
|
{
|
|
struct mrp_attr *attr;
|
|
enum mrp_event event;
|
|
|
|
attr = mrp_attr_lookup(app, mrp_cb(skb)->attrvalue,
|
|
mrp_cb(skb)->mh->attrlen,
|
|
mrp_cb(skb)->mh->attrtype);
|
|
if (attr == NULL)
|
|
return;
|
|
|
|
switch (vaevent) {
|
|
case MRP_VECATTR_EVENT_NEW:
|
|
event = MRP_EVENT_R_NEW;
|
|
break;
|
|
case MRP_VECATTR_EVENT_JOIN_IN:
|
|
event = MRP_EVENT_R_JOIN_IN;
|
|
break;
|
|
case MRP_VECATTR_EVENT_IN:
|
|
event = MRP_EVENT_R_IN;
|
|
break;
|
|
case MRP_VECATTR_EVENT_JOIN_MT:
|
|
event = MRP_EVENT_R_JOIN_MT;
|
|
break;
|
|
case MRP_VECATTR_EVENT_MT:
|
|
event = MRP_EVENT_R_MT;
|
|
break;
|
|
case MRP_VECATTR_EVENT_LV:
|
|
event = MRP_EVENT_R_LV;
|
|
break;
|
|
default:
|
|
return;
|
|
}
|
|
|
|
mrp_attr_event(app, attr, event);
|
|
}
|
|
|
|
static int mrp_pdu_parse_vecattr(struct mrp_applicant *app,
|
|
struct sk_buff *skb, int *offset)
|
|
{
|
|
struct mrp_vecattr_hdr _vah;
|
|
u16 valen;
|
|
u8 vaevents, vaevent;
|
|
|
|
mrp_cb(skb)->vah = skb_header_pointer(skb, *offset, sizeof(_vah),
|
|
&_vah);
|
|
if (!mrp_cb(skb)->vah)
|
|
return -1;
|
|
*offset += sizeof(_vah);
|
|
|
|
if (get_unaligned(&mrp_cb(skb)->vah->lenflags) &
|
|
MRP_VECATTR_HDR_FLAG_LA)
|
|
mrp_mad_event(app, MRP_EVENT_R_LA);
|
|
valen = be16_to_cpu(get_unaligned(&mrp_cb(skb)->vah->lenflags) &
|
|
MRP_VECATTR_HDR_LEN_MASK);
|
|
|
|
/* The VectorAttribute structure in a PDU carries event information
|
|
* about one or more attributes having consecutive values. Only the
|
|
* value for the first attribute is contained in the structure. So
|
|
* we make a copy of that value, and then increment it each time we
|
|
* advance to the next event in its Vector.
|
|
*/
|
|
if (sizeof(struct mrp_skb_cb) + mrp_cb(skb)->mh->attrlen >
|
|
sizeof_field(struct sk_buff, cb))
|
|
return -1;
|
|
if (skb_copy_bits(skb, *offset, mrp_cb(skb)->attrvalue,
|
|
mrp_cb(skb)->mh->attrlen) < 0)
|
|
return -1;
|
|
*offset += mrp_cb(skb)->mh->attrlen;
|
|
|
|
/* In a VectorAttribute, the Vector contains events which are packed
|
|
* three to a byte. We process one byte of the Vector at a time.
|
|
*/
|
|
while (valen > 0) {
|
|
if (skb_copy_bits(skb, *offset, &vaevents,
|
|
sizeof(vaevents)) < 0)
|
|
return -1;
|
|
*offset += sizeof(vaevents);
|
|
|
|
/* Extract and process the first event. */
|
|
vaevent = vaevents / (__MRP_VECATTR_EVENT_MAX *
|
|
__MRP_VECATTR_EVENT_MAX);
|
|
if (vaevent >= __MRP_VECATTR_EVENT_MAX) {
|
|
/* The byte is malformed; stop processing. */
|
|
return -1;
|
|
}
|
|
mrp_pdu_parse_vecattr_event(app, skb, vaevent);
|
|
|
|
/* If present, extract and process the second event. */
|
|
if (!--valen)
|
|
break;
|
|
mrp_attrvalue_inc(mrp_cb(skb)->attrvalue,
|
|
mrp_cb(skb)->mh->attrlen);
|
|
vaevents %= (__MRP_VECATTR_EVENT_MAX *
|
|
__MRP_VECATTR_EVENT_MAX);
|
|
vaevent = vaevents / __MRP_VECATTR_EVENT_MAX;
|
|
mrp_pdu_parse_vecattr_event(app, skb, vaevent);
|
|
|
|
/* If present, extract and process the third event. */
|
|
if (!--valen)
|
|
break;
|
|
mrp_attrvalue_inc(mrp_cb(skb)->attrvalue,
|
|
mrp_cb(skb)->mh->attrlen);
|
|
vaevents %= __MRP_VECATTR_EVENT_MAX;
|
|
vaevent = vaevents;
|
|
mrp_pdu_parse_vecattr_event(app, skb, vaevent);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int mrp_pdu_parse_msg(struct mrp_applicant *app, struct sk_buff *skb,
|
|
int *offset)
|
|
{
|
|
struct mrp_msg_hdr _mh;
|
|
|
|
mrp_cb(skb)->mh = skb_header_pointer(skb, *offset, sizeof(_mh), &_mh);
|
|
if (!mrp_cb(skb)->mh)
|
|
return -1;
|
|
*offset += sizeof(_mh);
|
|
|
|
if (mrp_cb(skb)->mh->attrtype == 0 ||
|
|
mrp_cb(skb)->mh->attrtype > app->app->maxattr ||
|
|
mrp_cb(skb)->mh->attrlen == 0)
|
|
return -1;
|
|
|
|
while (skb->len > *offset) {
|
|
if (mrp_pdu_parse_end_mark(skb, offset) < 0)
|
|
break;
|
|
if (mrp_pdu_parse_vecattr(app, skb, offset) < 0)
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int mrp_rcv(struct sk_buff *skb, struct net_device *dev,
|
|
struct packet_type *pt, struct net_device *orig_dev)
|
|
{
|
|
struct mrp_application *appl = container_of(pt, struct mrp_application,
|
|
pkttype);
|
|
struct mrp_port *port;
|
|
struct mrp_applicant *app;
|
|
struct mrp_pdu_hdr _ph;
|
|
const struct mrp_pdu_hdr *ph;
|
|
int offset = skb_network_offset(skb);
|
|
|
|
/* If the interface is in promiscuous mode, drop the packet if
|
|
* it was unicast to another host.
|
|
*/
|
|
if (unlikely(skb->pkt_type == PACKET_OTHERHOST))
|
|
goto out;
|
|
skb = skb_share_check(skb, GFP_ATOMIC);
|
|
if (unlikely(!skb))
|
|
goto out;
|
|
port = rcu_dereference(dev->mrp_port);
|
|
if (unlikely(!port))
|
|
goto out;
|
|
app = rcu_dereference(port->applicants[appl->type]);
|
|
if (unlikely(!app))
|
|
goto out;
|
|
|
|
ph = skb_header_pointer(skb, offset, sizeof(_ph), &_ph);
|
|
if (!ph)
|
|
goto out;
|
|
offset += sizeof(_ph);
|
|
|
|
if (ph->version != app->app->version)
|
|
goto out;
|
|
|
|
spin_lock(&app->lock);
|
|
while (skb->len > offset) {
|
|
if (mrp_pdu_parse_end_mark(skb, &offset) < 0)
|
|
break;
|
|
if (mrp_pdu_parse_msg(app, skb, &offset) < 0)
|
|
break;
|
|
}
|
|
spin_unlock(&app->lock);
|
|
out:
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
static int mrp_init_port(struct net_device *dev)
|
|
{
|
|
struct mrp_port *port;
|
|
|
|
port = kzalloc(sizeof(*port), GFP_KERNEL);
|
|
if (!port)
|
|
return -ENOMEM;
|
|
rcu_assign_pointer(dev->mrp_port, port);
|
|
return 0;
|
|
}
|
|
|
|
static void mrp_release_port(struct net_device *dev)
|
|
{
|
|
struct mrp_port *port = rtnl_dereference(dev->mrp_port);
|
|
unsigned int i;
|
|
|
|
for (i = 0; i <= MRP_APPLICATION_MAX; i++) {
|
|
if (rtnl_dereference(port->applicants[i]))
|
|
return;
|
|
}
|
|
RCU_INIT_POINTER(dev->mrp_port, NULL);
|
|
kfree_rcu(port, rcu);
|
|
}
|
|
|
|
int mrp_init_applicant(struct net_device *dev, struct mrp_application *appl)
|
|
{
|
|
struct mrp_applicant *app;
|
|
int err;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
if (!rtnl_dereference(dev->mrp_port)) {
|
|
err = mrp_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->group_address);
|
|
if (err < 0)
|
|
goto err3;
|
|
|
|
app->dev = dev;
|
|
app->app = appl;
|
|
app->mad = RB_ROOT;
|
|
app->active = true;
|
|
spin_lock_init(&app->lock);
|
|
skb_queue_head_init(&app->queue);
|
|
rcu_assign_pointer(dev->mrp_port->applicants[appl->type], app);
|
|
timer_setup(&app->join_timer, mrp_join_timer, 0);
|
|
mrp_join_timer_arm(app);
|
|
timer_setup(&app->periodic_timer, mrp_periodic_timer, 0);
|
|
mrp_periodic_timer_arm(app);
|
|
return 0;
|
|
|
|
err3:
|
|
kfree(app);
|
|
err2:
|
|
mrp_release_port(dev);
|
|
err1:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mrp_init_applicant);
|
|
|
|
void mrp_uninit_applicant(struct net_device *dev, struct mrp_application *appl)
|
|
{
|
|
struct mrp_port *port = rtnl_dereference(dev->mrp_port);
|
|
struct mrp_applicant *app = rtnl_dereference(
|
|
port->applicants[appl->type]);
|
|
|
|
ASSERT_RTNL();
|
|
|
|
RCU_INIT_POINTER(port->applicants[appl->type], NULL);
|
|
|
|
spin_lock_bh(&app->lock);
|
|
app->active = false;
|
|
spin_unlock_bh(&app->lock);
|
|
/* Delete timer and generate a final TX event to flush out
|
|
* all pending messages before the applicant is gone.
|
|
*/
|
|
timer_shutdown_sync(&app->join_timer);
|
|
timer_shutdown_sync(&app->periodic_timer);
|
|
|
|
spin_lock_bh(&app->lock);
|
|
mrp_mad_event(app, MRP_EVENT_TX);
|
|
mrp_attr_destroy_all(app);
|
|
mrp_pdu_queue(app);
|
|
spin_unlock_bh(&app->lock);
|
|
|
|
mrp_queue_xmit(app);
|
|
|
|
dev_mc_del(dev, appl->group_address);
|
|
kfree_rcu(app, rcu);
|
|
mrp_release_port(dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(mrp_uninit_applicant);
|
|
|
|
int mrp_register_application(struct mrp_application *appl)
|
|
{
|
|
appl->pkttype.func = mrp_rcv;
|
|
dev_add_pack(&appl->pkttype);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mrp_register_application);
|
|
|
|
void mrp_unregister_application(struct mrp_application *appl)
|
|
{
|
|
dev_remove_pack(&appl->pkttype);
|
|
}
|
|
EXPORT_SYMBOL_GPL(mrp_unregister_application);
|