/* 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/if_ether.h>
#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
#define DEBUG 0

static int tcp(void *data, uint64_t tp_off, void *data_end)
{
	struct tcphdr *tcp = data + tp_off;

	if (tcp + 1 > data_end)
		return 0;
	if (tcp->dest == htons(80) || tcp->source == htons(80))
		return TC_ACT_SHOT;
	return 0;
}

static int udp(void *data, uint64_t tp_off, void *data_end)
{
	struct udphdr *udp = data + tp_off;

	if (udp + 1 > data_end)
		return 0;
	if (udp->dest == htons(DEFAULT_PKTGEN_UDP_PORT) ||
	    udp->source == htons(DEFAULT_PKTGEN_UDP_PORT)) {
		if (DEBUG) {
			char fmt[] = "udp port 9 indeed\n";

			bpf_trace_printk(fmt, sizeof(fmt));
		}
		return TC_ACT_SHOT;
	}
	return 0;
}

static int parse_ipv4(void *data, uint64_t nh_off, void *data_end)
{
	struct iphdr *iph;
	uint64_t ihl_len;

	iph = data + nh_off;
	if (iph + 1 > data_end)
		return 0;

	if (ip_is_fragment(iph))
		return 0;
	ihl_len = iph->ihl * 4;

	if (iph->protocol == IPPROTO_IPIP) {
		iph = data + nh_off + ihl_len;
		if (iph + 1 > data_end)
			return 0;
		ihl_len += iph->ihl * 4;
	}

	if (iph->protocol == IPPROTO_TCP)
		return tcp(data, nh_off + ihl_len, data_end);
	else if (iph->protocol == IPPROTO_UDP)
		return udp(data, nh_off + ihl_len, data_end);
	return 0;
}

static int parse_ipv6(void *data, uint64_t nh_off, void *data_end)
{
	struct ipv6hdr *ip6h;
	struct iphdr *iph;
	uint64_t ihl_len = sizeof(struct ipv6hdr);
	uint64_t nexthdr;

	ip6h = data + nh_off;
	if (ip6h + 1 > data_end)
		return 0;

	nexthdr = ip6h->nexthdr;

	if (nexthdr == IPPROTO_IPIP) {
		iph = data + nh_off + ihl_len;
		if (iph + 1 > data_end)
			return 0;
		ihl_len += iph->ihl * 4;
		nexthdr = iph->protocol;
	} else if (nexthdr == IPPROTO_IPV6) {
		ip6h = data + nh_off + ihl_len;
		if (ip6h + 1 > data_end)
			return 0;
		ihl_len += sizeof(struct ipv6hdr);
		nexthdr = ip6h->nexthdr;
	}

	if (nexthdr == IPPROTO_TCP)
		return tcp(data, nh_off + ihl_len, data_end);
	else if (nexthdr == IPPROTO_UDP)
		return udp(data, nh_off + ihl_len, data_end);
	return 0;
}

struct vlan_hdr {
	uint16_t h_vlan_TCI;
	uint16_t h_vlan_encapsulated_proto;
};

SEC("varlen")
int handle_ingress(struct __sk_buff *skb)
{
	void *data = (void *)(long)skb->data;
	struct ethhdr *eth = data;
	void *data_end = (void *)(long)skb->data_end;
	uint64_t h_proto, nh_off;

	nh_off = sizeof(*eth);
	if (data + nh_off > data_end)
		return 0;

	h_proto = eth->h_proto;

	if (h_proto == ETH_P_8021Q || h_proto == ETH_P_8021AD) {
		struct vlan_hdr *vhdr;

		vhdr = data + nh_off;
		nh_off += sizeof(struct vlan_hdr);
		if (data + nh_off > data_end)
			return 0;
		h_proto = vhdr->h_vlan_encapsulated_proto;
	}
	if (h_proto == ETH_P_8021Q || h_proto == ETH_P_8021AD) {
		struct vlan_hdr *vhdr;

		vhdr = data + nh_off;
		nh_off += sizeof(struct vlan_hdr);
		if (data + nh_off > data_end)
			return 0;
		h_proto = vhdr->h_vlan_encapsulated_proto;
	}
	if (h_proto == htons(ETH_P_IP))
		return parse_ipv4(data, nh_off, data_end);
	else if (h_proto == htons(ETH_P_IPV6))
		return parse_ipv6(data, nh_off, data_end);
	return 0;
}
char _license[] SEC("license") = "GPL";
lue='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>Jisheng Zhang &lt;jszhang@marvell.com&gt;</td><td class='right'>2016-11-10 17:21:29 +0800</td></tr>
<tr><th>committer</th><td>Mark Brown &lt;broonie@kernel.org&gt;</td><td class='right'>2016-11-11 15:38:08 +0000</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/dns_resolver?id=09f2ba0b0b7c44ecea49cf69a708203b76ba5535'>09f2ba0b0b7c44ecea49cf69a708203b76ba5535</a> (<a href='/cgit.cgi/linux/net-next.git/patch/net/dns_resolver?id=09f2ba0b0b7c44ecea49cf69a708203b76ba5535'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=09f2ba0b0b7c44ecea49cf69a708203b76ba5535'>042df33ac99f77d8b86ac427431e267c33561c35</a> /<a href='/cgit.cgi/linux/net-next.git/tree/net/dns_resolver?id=09f2ba0b0b7c44ecea49cf69a708203b76ba5535'>net/dns_resolver</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/dns_resolver?id=1001354ca34179f3db924eb66672442a173147dc'>1001354ca34179f3db924eb66672442a173147dc</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/dns_resolver?id=09f2ba0b0b7c44ecea49cf69a708203b76ba5535&amp;id2=1001354ca34179f3db924eb66672442a173147dc'>diff</a>)</td></tr></table>
<div class='commit-subject'>regulator: gpio: properly check return value of of_get_named_gpio</div><div class='commit-msg'>The function of_get_named_gpio() could return -ENOENT, -EPROBE_DEFER
-EINVAL and so on. Currently, for the optional property "enable-gpio",
we only check -EPROBE_DEFER, this is not enough since there may be
misconfigured "enable-gpio" in the DTB, of_get_named_gpio() will return
-EINVAL in this case, we should return immediately here. And for the
optional property "gpios", we didn't check the return value, the driver
will continue to the point where gpio_request_array() is called, it
doesn't make sense to continue if we got -EPROBE_DEFER or -EINVAL here.

This patch tries to address these two issues by properly checking the
return value of of_get_named_gpio.

Signed-off-by: Jisheng Zhang &lt;jszhang@marvell.com&gt;
Signed-off-by: Mark Brown &lt;broonie@kernel.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=09f2ba0b0b7c44ecea49cf69a708203b76ba5535'>Diffstat</a> (limited to 'net/dns_resolver')</div><table summary='diffstat' class='diffstat'>