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Commit 3fdbd1ce authored by Ansis Atteka's avatar Ansis Atteka Committed by Jesse Gross
Browse files

openvswitch: add ipv6 'set' action 



This patch adds ipv6 set action functionality. It allows to change
traffic class, flow label, hop-limit, ipv6 source and destination
address fields.

Signed-off-by: default avatarAnsis Atteka <aatteka@nicira.com>
Signed-off-by: default avatarJesse Gross <jesse@nicira.com>
parent 9195bb8e

net/openvswitch/actions.c

+93 −0
Original line number Diff line number Diff line
@@ -28,6 +28,7 @@ 
#include <linux/if_arp.h>

#include <linux/if_vlan.h>

#include <net/ip.h>

#include <net/ipv6.h>

#include <net/checksum.h>

#include <net/dsfield.h>
@@ -162,6 +163,53 @@ static void set_ip_addr(struct sk_buff *skb, struct iphdr *nh, 
	*addr = new_addr;

}



static void update_ipv6_checksum(struct sk_buff *skb, u8 l4_proto,

				 __be32 addr[4], const __be32 new_addr[4])

{

	int transport_len = skb->len - skb_transport_offset(skb);



	if (l4_proto == IPPROTO_TCP) {

		if (likely(transport_len >= sizeof(struct tcphdr)))

			inet_proto_csum_replace16(&tcp_hdr(skb)->check, skb,

						  addr, new_addr, 1);

	} else if (l4_proto == IPPROTO_UDP) {

		if (likely(transport_len >= sizeof(struct udphdr))) {

			struct udphdr *uh = udp_hdr(skb);



			if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) {

				inet_proto_csum_replace16(&uh->check, skb,

							  addr, new_addr, 1);

				if (!uh->check)

					uh->check = CSUM_MANGLED_0;

			}

		}

	}

}



static void set_ipv6_addr(struct sk_buff *skb, u8 l4_proto,

			  __be32 addr[4], const __be32 new_addr[4],

			  bool recalculate_csum)

{

	if (recalculate_csum)

		update_ipv6_checksum(skb, l4_proto, addr, new_addr);



	skb->rxhash = 0;

	memcpy(addr, new_addr, sizeof(__be32[4]));

}



static void set_ipv6_tc(struct ipv6hdr *nh, u8 tc)

{

	nh->priority = tc >> 4;

	nh->flow_lbl[0] = (nh->flow_lbl[0] & 0x0F) | ((tc & 0x0F) << 4);

}



static void set_ipv6_fl(struct ipv6hdr *nh, u32 fl)

{

	nh->flow_lbl[0] = (nh->flow_lbl[0] & 0xF0) | (fl & 0x000F0000) >> 16;

	nh->flow_lbl[1] = (fl & 0x0000FF00) >> 8;

	nh->flow_lbl[2] = fl & 0x000000FF;

}



static void set_ip_ttl(struct sk_buff *skb, struct iphdr *nh, u8 new_ttl)

{

	csum_replace2(&nh->check, htons(nh->ttl << 8), htons(new_ttl << 8));
@@ -195,6 +243,47 @@ static int set_ipv4(struct sk_buff *skb, const struct ovs_key_ipv4 *ipv4_key) 
	return 0;

}



static int set_ipv6(struct sk_buff *skb, const struct ovs_key_ipv6 *ipv6_key)

{

	struct ipv6hdr *nh;

	int err;

	__be32 *saddr;

	__be32 *daddr;



	err = make_writable(skb, skb_network_offset(skb) +

			    sizeof(struct ipv6hdr));

	if (unlikely(err))

		return err;



	nh = ipv6_hdr(skb);

	saddr = (__be32 *)&nh->saddr;

	daddr = (__be32 *)&nh->daddr;



	if (memcmp(ipv6_key->ipv6_src, saddr, sizeof(ipv6_key->ipv6_src)))

		set_ipv6_addr(skb, ipv6_key->ipv6_proto, saddr,

			      ipv6_key->ipv6_src, true);



	if (memcmp(ipv6_key->ipv6_dst, daddr, sizeof(ipv6_key->ipv6_dst))) {

		unsigned int offset = 0;

		int flags = IP6_FH_F_SKIP_RH;

		bool recalc_csum = true;



		if (ipv6_ext_hdr(nh->nexthdr))

			recalc_csum = ipv6_find_hdr(skb, &offset,

						    NEXTHDR_ROUTING, NULL,

						    &flags) != NEXTHDR_ROUTING;



		set_ipv6_addr(skb, ipv6_key->ipv6_proto, daddr,

			      ipv6_key->ipv6_dst, recalc_csum);

	}



	set_ipv6_tc(nh, ipv6_key->ipv6_tclass);

	set_ipv6_fl(nh, ntohl(ipv6_key->ipv6_label));

	nh->hop_limit = ipv6_key->ipv6_hlimit;



	return 0;

}



/* Must follow make_writable() since that can move the skb data. */

static void set_tp_port(struct sk_buff *skb, __be16 *port,

			 __be16 new_port, __sum16 *check)
@@ -347,6 +436,10 @@ static int execute_set_action(struct sk_buff *skb, 
		err = set_ipv4(skb, nla_data(nested_attr));

		break;



	case OVS_KEY_ATTR_IPV6:

		err = set_ipv6(skb, nla_data(nested_attr));

		break;



	case OVS_KEY_ATTR_TCP:

		err = set_tcp(skb, nla_data(nested_attr));

		break;

net/openvswitch/datapath.c

+20 −0
Original line number Diff line number Diff line
@@ -479,6 +479,7 @@ static int validate_set(const struct nlattr *a, 


	switch (key_type) {

	const struct ovs_key_ipv4 *ipv4_key;

	const struct ovs_key_ipv6 *ipv6_key;



	case OVS_KEY_ATTR_PRIORITY:

	case OVS_KEY_ATTR_ETHERNET:
@@ -500,6 +501,25 @@ static int validate_set(const struct nlattr *a, 


		break;



	case OVS_KEY_ATTR_IPV6:

		if (flow_key->eth.type != htons(ETH_P_IPV6))

			return -EINVAL;



		if (!flow_key->ip.proto)

			return -EINVAL;



		ipv6_key = nla_data(ovs_key);

		if (ipv6_key->ipv6_proto != flow_key->ip.proto)

			return -EINVAL;



		if (ipv6_key->ipv6_frag != flow_key->ip.frag)

			return -EINVAL;



		if (ntohl(ipv6_key->ipv6_label) & 0xFFF00000)

			return -EINVAL;



		break;



	case OVS_KEY_ATTR_TCP:

		if (flow_key->ip.proto != IPPROTO_TCP)

			return -EINVAL;