/*
 * netsniff-ng - the packet sniffing beast
 * Copyright 2009, 2010 Daniel Borkmann.
 * Copyright 2010 Emmanuel Roullit.
 * Subject to the GPL, version 2.
 */

#include <stdio.h>
#include <stdint.h>
#include <netinet/in.h>    /* for ntohs() */
#include <arpa/inet.h>     /* for inet_ntop() */

#include "proto.h"
#include "protos.h"
#include "csum.h"
#include "dissector_eth.h"
#include "ipv6.h"
#include "geoip.h"
#include "pkt_buff.h"

extern void ipv6(struct pkt_buff *pkt);
extern void ipv6_less(struct pkt_buff *pkt);

void ipv6(struct pkt_buff *pkt)
{
	uint8_t traffic_class;
	uint32_t flow_label;
	char src_ip[INET6_ADDRSTRLEN];
	char dst_ip[INET6_ADDRSTRLEN];
	struct ipv6hdr *ip = (struct ipv6hdr *) pkt_pull(pkt, sizeof(*ip));
	struct sockaddr_in6 sas, sad;
	const char *city, *region, *country;

	if (ip == NULL)
		return;

	traffic_class = (ip->priority << 4) | 
			((ip->flow_lbl[0] & 0xF0) >> 4);
	flow_label = ((ip->flow_lbl[0] & 0x0F) << 8) |
		     (ip->flow_lbl[1] << 4) | ip->flow_lbl[2];

	inet_ntop(AF_INET6, &ip->saddr, src_ip, sizeof(src_ip));
	inet_ntop(AF_INET6, &ip->daddr, dst_ip, sizeof(dst_ip));

	tprintf(" [ IPv6 ");
	tprintf("Addr (%s => %s), ", src_ip, dst_ip);
	tprintf("Version (%u), ", ip->version);
	tprintf("TrafficClass (%u), ", traffic_class);
	tprintf("FlowLabel (%u), ", flow_label);
	tprintf("Len (%u), ", ntohs(ip->payload_len));
	tprintf("NextHdr (%u), ", ip->nexthdr);
	tprintf("HopLimit (%u)", ip->hop_limit);
	tprintf(" ]\n");

	memset(&sas, 0, sizeof(sas));
	sas.sin6_family = PF_INET6;
	memcpy(&sas.sin6_addr, &ip->saddr, sizeof(ip->saddr));

	memset(&sad, 0, sizeof(sad));
	sad.sin6_family = PF_INET6;
	memcpy(&sad.sin6_addr, &ip->daddr, sizeof(ip->daddr));

	if (geoip_working()) {
		tprintf("\t[ Geo (");
		if ((country = geoip6_country_name(sas))) {
			tprintf("%s", country);
			if ((region = geoip6_region_name(sas)))
				tprintf(" / %s", region);
			if ((city = geoip6_city_name(sas)))
				tprintf(" / %s", city);
		} else {
			tprintf("local");
		}
		tprintf(" => ");
		if ((country = geoip6_country_name(sad))) {
			tprintf("%s", country);
			if ((region = geoip6_region_name(sad)))
				tprintf(" / %s", region);
			if ((city = geoip6_city_name(sad)))
				tprintf(" / %s", city);
		} else {
			tprintf("local");
		}
		tprintf(") ]\n");
	}

	pkt_set_proto(pkt, &eth_lay3, ip->nexthdr);
}

void ipv6_less(struct pkt_buff *pkt)
{
	char src_ip[INET6_ADDRSTRLEN];
	char dst_ip[INET6_ADDRSTRLEN];
	struct ipv6hdr *ip = (struct ipv6hdr *) pkt_pull(pkt, sizeof(*ip));

	if (ip == NULL)
		return;

	inet_ntop(AF_INET6, &ip->saddr, src_ip, sizeof(src_ip));
	inet_ntop(AF_INET6, &ip->daddr, dst_ip, sizeof(dst_ip));

	tprintf(" %s/%s Len %u", src_ip, dst_ip,
		ntohs(ip->payload_len));

	pkt_set_proto(pkt, &eth_lay3, ip->nexthdr);
}

struct protocol ipv6_ops = {
	.key = 0x86DD,
	.print_full = ipv6,
	.print_less = ipv6_less,
};
vate-remove'/><input type='hidden' name='id' value='6c5d5cfbe3c59429e6d6f66477a7609aacf69751'/><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>Xin Long &lt;lucien.xin@gmail.com&gt;</td><td class='right'>2016-12-20 19:14:34 +0800</td></tr>
<tr><th>committer</th><td>Pablo Neira Ayuso &lt;pablo@netfilter.org&gt;</td><td class='right'>2016-12-23 15:20:01 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?h=nds-private-remove&amp;id=6c5d5cfbe3c59429e6d6f66477a7609aacf69751'>6c5d5cfbe3c59429e6d6f66477a7609aacf69751</a> (<a href='/cgit.cgi/linux/net-next.git/patch/?id=6c5d5cfbe3c59429e6d6f66477a7609aacf69751'>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=6c5d5cfbe3c59429e6d6f66477a7609aacf69751'>19435ae7ae7d2fe3d802de8672a535597eca32ab</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?h=nds-private-remove&amp;id=053d20f5712529016eae10356e0dea9b360325bd'>053d20f5712529016eae10356e0dea9b360325bd</a> (<a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=6c5d5cfbe3c59429e6d6f66477a7609aacf69751&amp;id2=053d20f5712529016eae10356e0dea9b360325bd'>diff</a>)</td></tr></table>
<div class='commit-subject'>netfilter: ipt_CLUSTERIP: check duplicate config when initializing</div><div class='commit-msg'>Now when adding an ipt_CLUSTERIP rule, it only checks duplicate config in
clusterip_config_find_get(). But after that, there may be still another
thread to insert a config with the same ip, then it leaves proc_create_data
to do duplicate check.

It's more reasonable to check duplicate config by ipt_CLUSTERIP itself,
instead of checking it by proc fs duplicate file check. Before, when proc
fs allowed duplicate name files in a directory, It could even crash kernel
because of use-after-free.

This patch is to check duplicate config under the protection of clusterip
net lock when initializing a new config and correct the return err.

Note that it also moves proc file node creation after adding new config, as
proc_create_data may sleep, it couldn't be called under the clusterip_net
lock. clusterip_config_find_get returns NULL if c-&gt;pde is null to make sure
it can't be used until the proc file node creation is done.

Suggested-by: Marcelo Ricardo Leitner &lt;marcelo.leitner@gmail.com&gt;
Signed-off-by: Xin Long &lt;lucien.xin@gmail.com&gt;
Signed-off-by: Pablo Neira Ayuso &lt;pablo@netfilter.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=6c5d5cfbe3c59429e6d6f66477a7609aacf69751'>Diffstat</a></div><table summary='diffstat' class='diffstat'>