#include <linux/module.h>
#include <linux/errno.h>
#include <linux/socket.h>
#include <linux/skbuff.h>
#include <linux/ip.h>
#include <linux/udp.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <net/fou.h>
#include <net/ip.h>
#include <net/ip6_tunnel.h>
#include <net/ip6_checksum.h>
#include <net/protocol.h>
#include <net/udp.h>
#include <net/udp_tunnel.h>

static void fou6_build_udp(struct sk_buff *skb, struct ip_tunnel_encap *e,
			   struct flowi6 *fl6, u8 *protocol, __be16 sport)
{
	struct udphdr *uh;

	skb_push(skb, sizeof(struct udphdr));
	skb_reset_transport_header(skb);

	uh = udp_hdr(skb);

	uh->dest = e->dport;
	uh->source = sport;
	uh->len = htons(skb->len);
	udp6_set_csum(!(e->flags & TUNNEL_ENCAP_FLAG_CSUM6), skb,
		      &fl6->saddr, &fl6->daddr, skb->len);

	*protocol = IPPROTO_UDP;
}

int fou6_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e,
		      u8 *protocol, struct flowi6 *fl6)
{
	__be16 sport;
	int err;
	int type = e->flags & TUNNEL_ENCAP_FLAG_CSUM6 ?
		SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;

	err = __fou_build_header(skb, e, protocol, &sport, type);
	if (err)
		return err;

	fou6_build_udp(skb, e, fl6, protocol, sport);

	return 0;
}
EXPORT_SYMBOL(fou6_build_header);

int gue6_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e,
		      u8 *protocol, struct flowi6 *fl6)
{
	__be16 sport;
	int err;
	int type = e->flags & TUNNEL_ENCAP_FLAG_CSUM6 ?
		SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;

	err = __gue_build_header(skb, e, protocol, &sport, type);
	if (err)
		return err;

	fou6_build_udp(skb, e, fl6, protocol, sport);

	return 0;
}
EXPORT_SYMBOL(gue6_build_header);

#if IS_ENABLED(CONFIG_IPV6_FOU_TUNNEL)

static const struct ip6_tnl_encap_ops fou_ip6tun_ops = {
	.encap_hlen = fou_encap_hlen,
	.build_header = fou6_build_header,
};

static const struct ip6_tnl_encap_ops gue_ip6tun_ops = {
	.encap_hlen = gue_encap_hlen,
	.build_header = gue6_build_header,
};

static int ip6_tnl_encap_add_fou_ops(void)
{
	int ret;

	ret = ip6_tnl_encap_add_ops(&fou_ip6tun_ops, TUNNEL_ENCAP_FOU);
	if (ret < 0) {
		pr_err("can't add fou6 ops\n");
		return ret;
	}

	ret = ip6_tnl_encap_add_ops(&gue_ip6tun_ops, TUNNEL_ENCAP_GUE);
	if (ret < 0) {
		pr_err("can't add gue6 ops\n");
		ip6_tnl_encap_del_ops(&fou_ip6tun_ops, TUNNEL_ENCAP_FOU);
		return ret;
	}

	return 0;
}

static void ip6_tnl_encap_del_fou_ops(void)
{
	ip6_tnl_encap_del_ops(&fou_ip6tun_ops, TUNNEL_ENCAP_FOU);
	ip6_tnl_encap_del_ops(&gue_ip6tun_ops, TUNNEL_ENCAP_GUE);
}

#else

static int ip6_tnl_encap_add_fou_ops(void)
{
	return 0;
}

static void ip6_tnl_encap_del_fou_ops(void)
{
}

#endif

static int __init fou6_init(void)
{
	int ret;

	ret = ip6_tnl_encap_add_fou_ops();

	return ret;
}

static void __exit fou6_fini(void)
{
	ip6_tnl_encap_del_fou_ops();
}

module_init(fou6_init);
module_exit(fou6_fini);
MODULE_AUTHOR("Tom Herbert <therbert@google.com>");
MODULE_LICENSE("GPL");
53c45c14c4b&amp;showmsg=1'>net</a>/<a href='/cgit.cgi/linux/net-next.git/log/net/bridge?id=8ef9594764617e3fd4500205b080b53c45c14c4b&amp;showmsg=1'>bridge</a>/<a href='/cgit.cgi/linux/net-next.git/log/net/bridge/br_input.c?id=8ef9594764617e3fd4500205b080b53c45c14c4b&amp;showmsg=1'>br_input.c</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/net/bridge/br_input.c?id=8ef9594764617e3fd4500205b080b53c45c14c4b'>Collapse</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>
<tr class='logheader'><td><span title='2017-02-07 14:16:05 -0500'>2017-02-07</span></td><td class='logsubject'><a href='/cgit.cgi/linux/net-next.git/commit/net/bridge/br_input.c?id=ca6d4480f87db9d9470d3d7bbe445953fa105e57'>bridge: avoid unnecessary read of jiffies</a></td><td>stephen hemminger</td><td>1</td><td><span class='deletions'>-2</span>/<span class='insertions'>+4</span></td></tr>
<tr class='nohover-highlight'><td/><td colspan='5' class='logmsg'>
Jiffies is volatile so read it once.

Signed-off-by: Stephen Hemminger &lt;sthemmin@microsoft.com&gt;
Acked-by: Nikolay Aleksandrov &lt;nikolay@cumulusnetworks.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;


</td></tr>
<tr class='logheader'><td><span title='2017-02-06 22:53:13 -0500'>2017-02-06</span></td><td class='logsubject'><a href='/cgit.cgi/linux/net-next.git/commit/net/bridge/br_input.c?id=83a718d6294964fd1b227fa5f1ad001bc1fe7656'>bridge: fdb: write to used and updated at most once per jiffy</a></td><td>Nikolay Aleksandrov</td><td>1</td><td><span class='deletions'>-1</span>/<span class='insertions'>+2</span></td></tr>
<tr class='nohover-highlight'><td/><td colspan='5' class='logmsg'>
Writing once per jiffy is enough to limit the bridge's false sharing.
After this change the bridge doesn't show up in the local load HitM stats.

Suggested-by: David S. Miller &lt;davem@davemloft.net&gt;
Signed-off-by: Nikolay Aleksandrov &lt;nikolay@cumulusnetworks.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;


</td></tr>
<tr class='logheader'><td><span title='2017-02-03 15:21:22 -0500'>2017-02-03</span></td><td class='logsubject'><a href='/cgit.cgi/linux/net-next.git/commit/net/bridge/br_input.c?id=11538d039ac6efcf4f1a6c536e1b87cd3668a9fd'>bridge: vlan dst_metadata hooks in ingress and egress paths</a></td><td>Roopa Prabhu</td><td>1</td><td><span class='deletions'>-1</span>/<span class='insertions'>+7</span></td></tr>
<tr class='nohover-highlight'><td/><td colspan='5' class='logmsg'>
- ingress hook:
    - if port is a tunnel port, use tunnel info in
      attached dst_metadata to map it to a local vlan
- egress hook:
    - if port is a tunnel port, use tunnel info attached to
      vlan to set dst_metadata on the skb

CC: Nikolay Aleksandrov &lt;nikolay@cumulusnetworks.com&gt;
Signed-off-by: Roopa Prabhu &lt;roopa@cumulusnetworks.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;


</td></tr>