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Commit 473ab820 authored by Tom Herbert's avatar Tom Herbert Committed by David S. Miller
Browse files

ipip: Setup and TX path for ipip/UDP foo-over-udp encapsulation 



Add netlink handling for IP tunnel encapsulation parameters and
and adjustment of MTU for encapsulation.  ip_tunnel_encap is called
from ip_tunnel_xmit to actually perform FOU encapsulation.

Signed-off-by: default avatarTom Herbert <therbert@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 14909664

net/ipv4/ipip.c

+77 −1
Original line number Diff line number Diff line
@@ -301,7 +301,8 @@ static int ipip_tunnel_init(struct net_device *dev) 
	memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);

	memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);



	tunnel->hlen = 0;

	tunnel->tun_hlen = 0;

	tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;

	tunnel->parms.iph.protocol = IPPROTO_IPIP;

	return ip_tunnel_init(dev);

}
@@ -340,10 +341,53 @@ static void ipip_netlink_parms(struct nlattr *data[], 
		parms->iph.frag_off = htons(IP_DF);

}



/* This function returns true when ENCAP attributes are present in the nl msg */

static bool ipip_netlink_encap_parms(struct nlattr *data[],

				     struct ip_tunnel_encap *ipencap)

{

	bool ret = false;



	memset(ipencap, 0, sizeof(*ipencap));



	if (!data)

		return ret;



	if (data[IFLA_IPTUN_ENCAP_TYPE]) {

		ret = true;

		ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);

	}



	if (data[IFLA_IPTUN_ENCAP_FLAGS]) {

		ret = true;

		ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);

	}



	if (data[IFLA_IPTUN_ENCAP_SPORT]) {

		ret = true;

		ipencap->sport = nla_get_u16(data[IFLA_IPTUN_ENCAP_SPORT]);

	}



	if (data[IFLA_IPTUN_ENCAP_DPORT]) {

		ret = true;

		ipencap->dport = nla_get_u16(data[IFLA_IPTUN_ENCAP_DPORT]);

	}



	return ret;

}



static int ipip_newlink(struct net *src_net, struct net_device *dev,

			struct nlattr *tb[], struct nlattr *data[])

{

	struct ip_tunnel_parm p;

	struct ip_tunnel_encap ipencap;



	if (ipip_netlink_encap_parms(data, &ipencap)) {

		struct ip_tunnel *t = netdev_priv(dev);

		int err = ip_tunnel_encap_setup(t, &ipencap);



		if (err < 0)

			return err;

	}



	ipip_netlink_parms(data, &p);

	return ip_tunnel_newlink(dev, tb, &p);
@@ -353,6 +397,15 @@ static int ipip_changelink(struct net_device *dev, struct nlattr *tb[], 
			   struct nlattr *data[])

{

	struct ip_tunnel_parm p;

	struct ip_tunnel_encap ipencap;



	if (ipip_netlink_encap_parms(data, &ipencap)) {

		struct ip_tunnel *t = netdev_priv(dev);

		int err = ip_tunnel_encap_setup(t, &ipencap);



		if (err < 0)

			return err;

	}



	ipip_netlink_parms(data, &p);
@@ -378,6 +431,14 @@ static size_t ipip_get_size(const struct net_device *dev) 
		nla_total_size(1) +

		/* IFLA_IPTUN_PMTUDISC */

		nla_total_size(1) +

		/* IFLA_IPTUN_ENCAP_TYPE */

		nla_total_size(2) +

		/* IFLA_IPTUN_ENCAP_FLAGS */

		nla_total_size(2) +

		/* IFLA_IPTUN_ENCAP_SPORT */

		nla_total_size(2) +

		/* IFLA_IPTUN_ENCAP_DPORT */

		nla_total_size(2) +

		0;

}
@@ -394,6 +455,17 @@ static int ipip_fill_info(struct sk_buff *skb, const struct net_device *dev) 
	    nla_put_u8(skb, IFLA_IPTUN_PMTUDISC,

		       !!(parm->iph.frag_off & htons(IP_DF))))

		goto nla_put_failure;



	if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE,

			tunnel->encap.type) ||

	    nla_put_u16(skb, IFLA_IPTUN_ENCAP_SPORT,

			tunnel->encap.sport) ||

	    nla_put_u16(skb, IFLA_IPTUN_ENCAP_DPORT,

			tunnel->encap.dport) ||

	    nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS,

			tunnel->encap.dport))

		goto nla_put_failure;



	return 0;



nla_put_failure:
@@ -407,6 +479,10 @@ static const struct nla_policy ipip_policy[IFLA_IPTUN_MAX + 1] = { 
	[IFLA_IPTUN_TTL]		= { .type = NLA_U8 },

	[IFLA_IPTUN_TOS]		= { .type = NLA_U8 },

	[IFLA_IPTUN_PMTUDISC]		= { .type = NLA_U8 },

	[IFLA_IPTUN_ENCAP_TYPE]		= { .type = NLA_U16 },

	[IFLA_IPTUN_ENCAP_FLAGS]	= { .type = NLA_U16 },

	[IFLA_IPTUN_ENCAP_SPORT]	= { .type = NLA_U16 },

	[IFLA_IPTUN_ENCAP_DPORT]	= { .type = NLA_U16 },

};



static struct rtnl_link_ops ipip_link_ops __read_mostly = {