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Commit 891ef8dd authored by David Lebrun's avatar David Lebrun Committed by David S. Miller
Browse files

ipv6: sr: implement additional seg6local actions 



This patch implements the following seg6local actions.

- SEG6_LOCAL_ACTION_END_T: regular SRH processing and forward to the
  next-hop looked up in the specified routing table.

- SEG6_LOCAL_ACTION_END_DX2: decapsulate an L2 frame and forward it to
  the specified network interface.

- SEG6_LOCAL_ACTION_END_DX4: decapsulate an IPv4 packet and forward it,
  possibly to the specified next-hop.

- SEG6_LOCAL_ACTION_END_DT6: decapsulate an IPv6 packet and forward it
  to the next-hop looked up in the specified routing table.

Signed-off-by: default avatarDavid Lebrun <david.lebrun@uclouvain.be>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent d7a669dd

net/ipv6/seg6_local.c

+147 −0
Original line number Diff line number Diff line
@@ -30,6 +30,7 @@ 
#ifdef CONFIG_IPV6_SEG6_HMAC

#include <net/seg6_hmac.h>

#endif

#include <linux/etherdevice.h>



struct seg6_local_lwt;
@@ -226,6 +227,82 @@ static int input_action_end_x(struct sk_buff *skb, struct seg6_local_lwt *slwt) 
	return -EINVAL;

}



static int input_action_end_t(struct sk_buff *skb, struct seg6_local_lwt *slwt)

{

	struct ipv6_sr_hdr *srh;



	srh = get_and_validate_srh(skb);

	if (!srh)

		goto drop;



	advance_nextseg(srh, &ipv6_hdr(skb)->daddr);



	lookup_nexthop(skb, NULL, slwt->table);



	return dst_input(skb);



drop:

	kfree_skb(skb);

	return -EINVAL;

}



/* decapsulate and forward inner L2 frame on specified interface */

static int input_action_end_dx2(struct sk_buff *skb,

				struct seg6_local_lwt *slwt)

{

	struct net *net = dev_net(skb->dev);

	struct net_device *odev;

	struct ethhdr *eth;



	if (!decap_and_validate(skb, NEXTHDR_NONE))

		goto drop;



	if (!pskb_may_pull(skb, ETH_HLEN))

		goto drop;



	skb_reset_mac_header(skb);

	eth = (struct ethhdr *)skb->data;



	/* To determine the frame's protocol, we assume it is 802.3. This avoids

	 * a call to eth_type_trans(), which is not really relevant for our

	 * use case.

	 */

	if (!eth_proto_is_802_3(eth->h_proto))

		goto drop;



	odev = dev_get_by_index_rcu(net, slwt->oif);

	if (!odev)

		goto drop;



	/* As we accept Ethernet frames, make sure the egress device is of

	 * the correct type.

	 */

	if (odev->type != ARPHRD_ETHER)

		goto drop;



	if (!(odev->flags & IFF_UP) || !netif_carrier_ok(odev))

		goto drop;



	skb_orphan(skb);



	if (skb_warn_if_lro(skb))

		goto drop;



	skb_forward_csum(skb);



	if (skb->len - ETH_HLEN > odev->mtu)

		goto drop;



	skb->dev = odev;

	skb->protocol = eth->h_proto;



	return dev_queue_xmit(skb);



drop:

	kfree_skb(skb);

	return -EINVAL;

}



/* decapsulate and forward to specified nexthop */

static int input_action_end_dx6(struct sk_buff *skb,

				struct seg6_local_lwt *slwt)
@@ -260,6 +337,56 @@ static int input_action_end_dx6(struct sk_buff *skb, 
	return -EINVAL;

}



static int input_action_end_dx4(struct sk_buff *skb,

				struct seg6_local_lwt *slwt)

{

	struct iphdr *iph;

	__be32 nhaddr;

	int err;



	if (!decap_and_validate(skb, IPPROTO_IPIP))

		goto drop;



	if (!pskb_may_pull(skb, sizeof(struct iphdr)))

		goto drop;



	skb->protocol = htons(ETH_P_IP);



	iph = ip_hdr(skb);



	nhaddr = slwt->nh4.s_addr ?: iph->daddr;



	skb_dst_drop(skb);



	err = ip_route_input(skb, nhaddr, iph->saddr, 0, skb->dev);

	if (err)

		goto drop;



	return dst_input(skb);



drop:

	kfree_skb(skb);

	return -EINVAL;

}



static int input_action_end_dt6(struct sk_buff *skb,

				struct seg6_local_lwt *slwt)

{

	if (!decap_and_validate(skb, IPPROTO_IPV6))

		goto drop;



	if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))

		goto drop;



	lookup_nexthop(skb, NULL, slwt->table);



	return dst_input(skb);



drop:

	kfree_skb(skb);

	return -EINVAL;

}



/* push an SRH on top of the current one */

static int input_action_end_b6(struct sk_buff *skb, struct seg6_local_lwt *slwt)

{
@@ -329,11 +456,31 @@ static struct seg6_action_desc seg6_action_table[] = { 
		.attrs		= (1 << SEG6_LOCAL_NH6),

		.input		= input_action_end_x,

	},

	{

		.action		= SEG6_LOCAL_ACTION_END_T,

		.attrs		= (1 << SEG6_LOCAL_TABLE),

		.input		= input_action_end_t,

	},

	{

		.action		= SEG6_LOCAL_ACTION_END_DX2,

		.attrs		= (1 << SEG6_LOCAL_OIF),

		.input		= input_action_end_dx2,

	},

	{

		.action		= SEG6_LOCAL_ACTION_END_DX6,

		.attrs		= (1 << SEG6_LOCAL_NH6),

		.input		= input_action_end_dx6,

	},

	{

		.action		= SEG6_LOCAL_ACTION_END_DX4,

		.attrs		= (1 << SEG6_LOCAL_NH4),

		.input		= input_action_end_dx4,

	},

	{

		.action		= SEG6_LOCAL_ACTION_END_DT6,

		.attrs		= (1 << SEG6_LOCAL_TABLE),

		.input		= input_action_end_dt6,

	},

	{

		.action		= SEG6_LOCAL_ACTION_END_B6,

		.attrs		= (1 << SEG6_LOCAL_SRH),