/* Copyright (c) 2016 Facebook
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 */
#define KBUILD_MODNAME "foo"
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/in.h>
#include <linux/tcp.h>
#include <linux/udp.h>
#include <uapi/linux/bpf.h>
#include <net/ip.h>
#include "bpf_helpers.h"

#define DEFAULT_PKTGEN_UDP_PORT 9

/* copy of 'struct ethhdr' without __packed */
struct eth_hdr {
	unsigned char   h_dest[ETH_ALEN];
	unsigned char   h_source[ETH_ALEN];
	unsigned short  h_proto;
};

SEC("simple")
int handle_ingress(struct __sk_buff *skb)
{
	void *data = (void *)(long)skb->data;
	struct eth_hdr *eth = data;
	struct iphdr *iph = data + sizeof(*eth);
	struct udphdr *udp = data + sizeof(*eth) + sizeof(*iph);
	void *data_end = (void *)(long)skb->data_end;

	/* single length check */
	if (data + sizeof(*eth) + sizeof(*iph) + sizeof(*udp) > data_end)
		return 0;

	if (eth->h_proto != htons(ETH_P_IP))
		return 0;
	if (iph->protocol != IPPROTO_UDP || iph->ihl != 5)
		return 0;
	if (ip_is_fragment(iph))
		return 0;
	if (udp->dest == htons(DEFAULT_PKTGEN_UDP_PORT))
		return TC_ACT_SHOT;
	return 0;
}
char _license[] SEC("license") = "GPL";
alue='packet-loop-back'>packet-loop-back</option>
<option value='packet-rx-pump-back'>packet-rx-pump-back</option>
</select> <input type='submit' value='switch'/></form></td></tr>
<tr><td class='sub'>net-next plumbings</td><td class='sub right'>Tobias Klauser</td></tr></table>
<table class='tabs'><tr><td>
<a href='/cgit.cgi/linux/net-next.git/?h=nds-private-remove'>summary</a><a href='/cgit.cgi/linux/net-next.git/refs/?h=nds-private-remove&amp;id=4759d386d55fef452d692bf101167914437e848e'>refs</a><a href='/cgit.cgi/linux/net-next.git/log/tools/virtio/ringtest?h=nds-private-remove'>log</a><a href='/cgit.cgi/linux/net-next.git/tree/tools/virtio/ringtest?h=nds-private-remove&amp;id=4759d386d55fef452d692bf101167914437e848e'>tree</a><a class='active' href='/cgit.cgi/linux/net-next.git/commit/tools/virtio/ringtest?h=nds-private-remove&amp;id=4759d386d55fef452d692bf101167914437e848e'>commit</a><a href='/cgit.cgi/linux/net-next.git/diff/tools/virtio/ringtest?h=nds-private-remove&amp;id=4759d386d55fef452d692bf101167914437e848e'>diff</a></td><td class='form'><form class='right' method='get' action='/cgit.cgi/linux/net-next.git/log/tools/virtio/ringtest'>
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?h=nds-private-remove&amp;id=4759d386d55fef452d692bf101167914437e848e'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools?h=nds-private-remove&amp;id=4759d386d55fef452d692bf101167914437e848e'>tools</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools/virtio?h=nds-private-remove&amp;id=4759d386d55fef452d692bf101167914437e848e'>virtio</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools/virtio/ringtest?h=nds-private-remove&amp;id=4759d386d55fef452d692bf101167914437e848e'>ringtest</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='4759d386d55fef452d692bf101167914437e848e'/><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>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-01 12:27:05 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-01 12:27:05 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/virtio/ringtest?h=nds-private-remove&amp;id=4759d386d55fef452d692bf101167914437e848e'>4759d386d55fef452d692bf101167914437e848e</a> (<a href='/cgit.cgi/linux/net-next.git/patch/tools/virtio/ringtest?id=4759d386d55fef452d692bf101167914437e848e'>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=4759d386d55fef452d692bf101167914437e848e'>e7109c192ec589fcea2a98f9702aa3c0e4009581</a> /<a href='/cgit.cgi/linux/net-next.git/tree/tools/virtio/ringtest?h=nds-private-remove&amp;id=4759d386d55fef452d692bf101167914437e848e'>tools/virtio/ringtest</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/virtio/ringtest?h=nds-private-remove&amp;id=238d1d0f79f619d75c2cc741d6770fb0986aef24'>238d1d0f79f619d75c2cc741d6770fb0986aef24</a> (<a href='/cgit.cgi/linux/net-next.git/diff/tools/virtio/ringtest?h=nds-private-remove&amp;id=4759d386d55fef452d692bf101167914437e848e&amp;id2=238d1d0f79f619d75c2cc741d6770fb0986aef24'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/virtio/ringtest?h=nds-private-remove&amp;id=1db175428ee374489448361213e9c3b749d14900'>1db175428ee374489448361213e9c3b749d14900</a> (<a href='/cgit.cgi/linux/net-next.git/diff/tools/virtio/ringtest?h=nds-private-remove&amp;id=4759d386d55fef452d692bf101167914437e848e&amp;id2=1db175428ee374489448361213e9c3b749d14900'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge branch 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm</div><div class='commit-msg'>Pull DAX updates from Dan Williams:
 "The completion of Jan's DAX work for 4.10.

  As I mentioned in the libnvdimm-for-4.10 pull request, these are some
  final fixes for the DAX dirty-cacheline-tracking invalidation work
  that was merged through the -mm, ext4, and xfs trees in -rc1. These
  patches were prepared prior to the merge window, but we waited for
  4.10-rc1 to have a stable merge base after all the prerequisites were
  merged.

  Quoting Jan on the overall changes in these patches:

     "So I'd like all these 6 patches to go for rc2. The first three
      patches fix invalidation of exceptional DAX entries (a bug which
      is there for a long time) - without these patches data loss can
      occur on power failure even though user called fsync(2). The other
      three patches change locking of DAX faults so that -&gt;iomap_begin()
      is called in a more relaxed locking context and we are safe to
      start a transaction there for ext4"

  These have received a build success notification from the kbuild
  robot, and pass the latest libnvdimm unit tests. There have not been
  any -next releases since -rc1, so they have not appeared there"

* 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
  ext4: Simplify DAX fault path
  dax: Call -&gt;iomap_begin without entry lock during dax fault
  dax: Finish fault completely when loading holes
  dax: Avoid page invalidation races and unnecessary radix tree traversals
  mm: Invalidate DAX radix tree entries only if appropriate
  ext2: Return BH_New buffers for zeroed blocks
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=4759d386d55fef452d692bf101167914437e848e'>Diffstat</a> (limited to 'tools/virtio/ringtest')</div><table summary='diffstat' class='diffstat'>