/* 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 <uapi/linux/if_ether.h>
#include <uapi/linux/in6.h>
#include <uapi/linux/ipv6.h>
#include <uapi/linux/pkt_cls.h>
#include <uapi/linux/bpf.h>
#include "bpf_helpers.h"

/* 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;
};

#define PIN_GLOBAL_NS		2
struct bpf_elf_map {
	__u32 type;
	__u32 size_key;
	__u32 size_value;
	__u32 max_elem;
	__u32 flags;
	__u32 id;
	__u32 pinning;
};

struct bpf_elf_map SEC("maps") test_cgrp2_array_pin = {
	.type		= BPF_MAP_TYPE_CGROUP_ARRAY,
	.size_key	= sizeof(uint32_t),
	.size_value	= sizeof(uint32_t),
	.pinning	= PIN_GLOBAL_NS,
	.max_elem	= 1,
};

SEC("filter")
int handle_egress(struct __sk_buff *skb)
{
	void *data = (void *)(long)skb->data;
	struct eth_hdr *eth = data;
	struct ipv6hdr *ip6h = data + sizeof(*eth);
	void *data_end = (void *)(long)skb->data_end;
	char dont_care_msg[] = "dont care %04x %d\n";
	char pass_msg[] = "pass\n";
	char reject_msg[] = "reject\n";

	/* single length check */
	if (data + sizeof(*eth) + sizeof(*ip6h) > data_end)
		return TC_ACT_OK;

	if (eth->h_proto != htons(ETH_P_IPV6) ||
	    ip6h->nexthdr != IPPROTO_ICMPV6) {
		bpf_trace_printk(dont_care_msg, sizeof(dont_care_msg),
				 eth->h_proto, ip6h->nexthdr);
		return TC_ACT_OK;
	} else if (bpf_skb_under_cgroup(skb, &test_cgrp2_array_pin, 0) != 1) {
		bpf_trace_printk(pass_msg, sizeof(pass_msg));
		return TC_ACT_OK;
	} else {
		bpf_trace_printk(reject_msg, sizeof(reject_msg));
		return TC_ACT_SHOT;
	}
}

char _license[] SEC("license") = "GPL";
='/cgit.cgi/linux/net-next.git/commit/include?id=84b6079134420f4635f23c2088a3892057b23bb0'>commit</a><a href='/cgit.cgi/linux/net-next.git/diff/include?id=84b6079134420f4635f23c2088a3892057b23bb0'>diff</a></td><td class='form'><form class='right' method='get' action='/cgit.cgi/linux/net-next.git/log/include'>
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=84b6079134420f4635f23c2088a3892057b23bb0'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include?id=84b6079134420f4635f23c2088a3892057b23bb0'>include</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='84b6079134420f4635f23c2088a3892057b23bb0'/><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'>2016-12-14 10:31:25 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2016-12-14 10:31:25 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include?id=84b6079134420f4635f23c2088a3892057b23bb0'>84b6079134420f4635f23c2088a3892057b23bb0</a> (<a href='/cgit.cgi/linux/net-next.git/patch/include?id=84b6079134420f4635f23c2088a3892057b23bb0'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=84b6079134420f4635f23c2088a3892057b23bb0'>ab1cfa2f48abc9b3edc763ac1bc5e243e853981f</a> /<a href='/cgit.cgi/linux/net-next.git/tree/include?id=84b6079134420f4635f23c2088a3892057b23bb0'>include</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include?id=5084fdf081739b7455c7aeecda6d7b83ec59c85f'>5084fdf081739b7455c7aeecda6d7b83ec59c85f</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include?id=84b6079134420f4635f23c2088a3892057b23bb0&amp;id2=5084fdf081739b7455c7aeecda6d7b83ec59c85f'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include?id=e16769d4bca67218531505ad1a8365d227fedcf9'>e16769d4bca67218531505ad1a8365d227fedcf9</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include?id=84b6079134420f4635f23c2088a3892057b23bb0&amp;id2=e16769d4bca67218531505ad1a8365d227fedcf9'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge tag 'configfs-for-4.10' of git://git.infradead.org/users/hch/configfs</div><div class='commit-msg'>Pull configfs update from Christoph Hellwig:
 "Just one simple change from Andrzej to drop the pointless return value
  from the -&gt;drop_link method"

* tag 'configfs-for-4.10' of git://git.infradead.org/users/hch/configfs:
  fs: configfs: don't return anything from drop_link
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=84b6079134420f4635f23c2088a3892057b23bb0'>Diffstat</a> (limited to 'include')</div><table summary='diffstat' class='diffstat'>