/*
 * Copyright (c) 2011 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.
 *
 * Based on Rusty Russell's IPv4 ICMP NAT code. Development of IPv6
 * NAT funded by Astaro.
 */

#include <linux/types.h>
#include <linux/init.h>
#include <linux/icmpv6.h>

#include <linux/netfilter.h>
#include <net/netfilter/nf_nat.h>
#include <net/netfilter/nf_nat_core.h>
#include <net/netfilter/nf_nat_l3proto.h>
#include <net/netfilter/nf_nat_l4proto.h>

static bool
icmpv6_in_range(const struct nf_conntrack_tuple *tuple,
		enum nf_nat_manip_type maniptype,
		const union nf_conntrack_man_proto *min,
		const union nf_conntrack_man_proto *max)
{
	return ntohs(tuple->src.u.icmp.id) >= ntohs(min->icmp.id) &&
	       ntohs(tuple->src.u.icmp.id) <= ntohs(max->icmp.id);
}

static void
icmpv6_unique_tuple(const struct nf_nat_l3proto *l3proto,
		    struct nf_conntrack_tuple *tuple,
		    const struct nf_nat_range *range,
		    enum nf_nat_manip_type maniptype,
		    const struct nf_conn *ct)
{
	static u16 id;
	unsigned int range_size;
	unsigned int i;

	range_size = ntohs(range->max_proto.icmp.id) -
		     ntohs(range->min_proto.icmp.id) + 1;

	if (!(range->flags & NF_NAT_RANGE_PROTO_SPECIFIED))
		range_size = 0xffff;

	for (i = 0; ; ++id) {
		tuple->src.u.icmp.id = htons(ntohs(range->min_proto.icmp.id) +
					     (id % range_size));
		if (++i == range_size || !nf_nat_used_tuple(tuple, ct))
			return;
	}
}

static bool
icmpv6_manip_pkt(struct sk_buff *skb,
		 const struct nf_nat_l3proto *l3proto,
		 unsigned int iphdroff, unsigned int hdroff,
		 const struct nf_conntrack_tuple *tuple,
		 enum nf_nat_manip_type maniptype)
{
	struct icmp6hdr *hdr;

	if (!skb_make_writable(skb, hdroff + sizeof(*hdr)))
		return false;

	hdr = (struct icmp6hdr *)(skb->data + hdroff);
	l3proto->csum_update(skb, iphdroff, &hdr->icmp6_cksum,
			     tuple, maniptype);
	if (hdr->icmp6_type == ICMPV6_ECHO_REQUEST ||
	    hdr->icmp6_type == ICMPV6_ECHO_REPLY) {
		inet_proto_csum_replace2(&hdr->icmp6_cksum, skb,
					 hdr->icmp6_identifier,
					 tuple->src.u.icmp.id, false);
		hdr->icmp6_identifier = tuple->src.u.icmp.id;
	}
	return true;
}

const struct nf_nat_l4proto nf_nat_l4proto_icmpv6 = {
	.l4proto		= IPPROTO_ICMPV6,
	.manip_pkt		= icmpv6_manip_pkt,
	.in_range		= icmpv6_in_range,
	.unique_tuple		= icmpv6_unique_tuple,
#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
	.nlattr_to_range	= nf_nat_l4proto_nlattr_to_range,
#endif
};
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?h=nds-private-remove&amp;id=dd86e373e09fb16b83e8adf5c48c421a4ca76468'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net?h=nds-private-remove&amp;id=dd86e373e09fb16b83e8adf5c48c421a4ca76468'>net</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/ncsi?h=nds-private-remove&amp;id=dd86e373e09fb16b83e8adf5c48c421a4ca76468'>ncsi</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/ncsi/Kconfig?h=nds-private-remove&amp;id=dd86e373e09fb16b83e8adf5c48c421a4ca76468'>Kconfig</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='h' value='nds-private-remove'/><input type='hidden' name='id' value='dd86e373e09fb16b83e8adf5c48c421a4ca76468'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Thomas Gleixner &lt;tglx@linutronix.de&gt;</td><td class='right'>2017-01-31 23:58:38 +0100</td></tr>
<tr><th>committer</th><td>Ingo Molnar &lt;mingo@kernel.org&gt;</td><td class='right'>2017-02-01 08:37:27 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/ncsi/Kconfig?h=nds-private-remove&amp;id=dd86e373e09fb16b83e8adf5c48c421a4ca76468'>dd86e373e09fb16b83e8adf5c48c421a4ca76468</a> (<a href='/cgit.cgi/linux/net-next.git/patch/net/ncsi/Kconfig?id=dd86e373e09fb16b83e8adf5c48c421a4ca76468'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?h=nds-private-remove&amp;id=dd86e373e09fb16b83e8adf5c48c421a4ca76468'>55703c2ea8584e303e342090614e0aab3509ab21</a> /<a href='/cgit.cgi/linux/net-next.git/tree/net/ncsi/Kconfig?h=nds-private-remove&amp;id=dd86e373e09fb16b83e8adf5c48c421a4ca76468'>net/ncsi/Kconfig</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/ncsi/Kconfig?h=nds-private-remove&amp;id=0b3589be9b98994ce3d5aeca52445d1f5627c4ba'>0b3589be9b98994ce3d5aeca52445d1f5627c4ba</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/ncsi/Kconfig?h=nds-private-remove&amp;id=dd86e373e09fb16b83e8adf5c48c421a4ca76468&amp;id2=0b3589be9b98994ce3d5aeca52445d1f5627c4ba'>diff</a>)</td></tr></table>
<div class='commit-subject'>perf/x86/intel/rapl: Make package handling more robust</div><div class='commit-msg'>The package management code in RAPL relies on package mapping being
available before a CPU is started. This changed with:

  9d85eb9119f4 ("x86/smpboot: Make logical package management more robust")

because the ACPI/BIOS information turned out to be unreliable, but that
left RAPL in broken state. This was not noticed because on a regular boot
all CPUs are online before RAPL is initialized.

A possible fix would be to reintroduce the mess which allocates a package
data structure in CPU prepare and when it turns out to already exist in
starting throw it away later in the CPU online callback. But that's a
horrible hack and not required at all because RAPL becomes functional for
perf only in the CPU online callback. That's correct because user space is
not yet informed about the CPU being onlined, so nothing caan rely on RAPL
being available on that particular CPU.

Move the allocation to the CPU online callback and simplify the hotplug
handling. At this point the package mapping is established and correct.

This also adds a missing check for available package data in the
event_init() function.

Reported-by: Yasuaki Ishimatsu &lt;yasu.isimatu@gmail.com&gt;
Signed-off-by: Thomas Gleixner &lt;tglx@linutronix.de&gt;
Cc: Alexander Shishkin &lt;alexander.shishkin@linux.intel.com&gt;
Cc: Arnaldo Carvalho de Melo &lt;acme@redhat.com&gt;
Cc: Jiri Olsa &lt;jolsa@redhat.com&gt;
Cc: Linus Torvalds &lt;torvalds@linux-foundation.org&gt;
Cc: Peter Zijlstra &lt;peterz@infradead.org&gt;
Cc: Sebastian Siewior &lt;bigeasy@linutronix.de&gt;
Cc: Stephane Eranian &lt;eranian@google.com&gt;
Cc: Vince Weaver &lt;vincent.weaver@maine.edu&gt;
Fixes: 9d85eb9119f4 ("x86/smpboot: Make logical package management more robust")
Link: http://lkml.kernel.org/r/20170131230141.212593966@linutronix.de
Signed-off-by: Ingo Molnar &lt;mingo@kernel.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=dd86e373e09fb16b83e8adf5c48c421a4ca76468'>Diffstat</a> (limited to 'net/ncsi/Kconfig')</div><table summary='diffstat' class='diffstat'>