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: David Lebrun <david.lebrun@uclouvain.be> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Lebrun
David S. Miller
parent
d7a669dd2f
commit
891ef8dd2a
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@ -30,6 +30,7 @@
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#ifdef CONFIG_IPV6_SEG6_HMAC
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#include <net/seg6_hmac.h>
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#endif
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#include <linux/etherdevice.h>
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struct seg6_local_lwt;
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@ -226,6 +227,82 @@ drop:
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return -EINVAL;
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}
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static int input_action_end_t(struct sk_buff *skb, struct seg6_local_lwt *slwt)
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{
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struct ipv6_sr_hdr *srh;
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srh = get_and_validate_srh(skb);
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if (!srh)
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goto drop;
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advance_nextseg(srh, &ipv6_hdr(skb)->daddr);
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lookup_nexthop(skb, NULL, slwt->table);
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return dst_input(skb);
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drop:
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kfree_skb(skb);
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return -EINVAL;
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}
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/* decapsulate and forward inner L2 frame on specified interface */
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static int input_action_end_dx2(struct sk_buff *skb,
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struct seg6_local_lwt *slwt)
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{
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struct net *net = dev_net(skb->dev);
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struct net_device *odev;
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struct ethhdr *eth;
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if (!decap_and_validate(skb, NEXTHDR_NONE))
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goto drop;
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if (!pskb_may_pull(skb, ETH_HLEN))
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goto drop;
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skb_reset_mac_header(skb);
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eth = (struct ethhdr *)skb->data;
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/* To determine the frame's protocol, we assume it is 802.3. This avoids
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* a call to eth_type_trans(), which is not really relevant for our
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* use case.
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*/
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if (!eth_proto_is_802_3(eth->h_proto))
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goto drop;
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odev = dev_get_by_index_rcu(net, slwt->oif);
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if (!odev)
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goto drop;
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/* As we accept Ethernet frames, make sure the egress device is of
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* the correct type.
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*/
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if (odev->type != ARPHRD_ETHER)
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goto drop;
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if (!(odev->flags & IFF_UP) || !netif_carrier_ok(odev))
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goto drop;
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skb_orphan(skb);
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if (skb_warn_if_lro(skb))
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goto drop;
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skb_forward_csum(skb);
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if (skb->len - ETH_HLEN > odev->mtu)
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goto drop;
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skb->dev = odev;
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skb->protocol = eth->h_proto;
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return dev_queue_xmit(skb);
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drop:
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kfree_skb(skb);
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return -EINVAL;
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}
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/* decapsulate and forward to specified nexthop */
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static int input_action_end_dx6(struct sk_buff *skb,
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struct seg6_local_lwt *slwt)
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@ -260,6 +337,56 @@ drop:
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return -EINVAL;
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}
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static int input_action_end_dx4(struct sk_buff *skb,
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struct seg6_local_lwt *slwt)
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{
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struct iphdr *iph;
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__be32 nhaddr;
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int err;
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if (!decap_and_validate(skb, IPPROTO_IPIP))
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goto drop;
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if (!pskb_may_pull(skb, sizeof(struct iphdr)))
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goto drop;
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skb->protocol = htons(ETH_P_IP);
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iph = ip_hdr(skb);
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nhaddr = slwt->nh4.s_addr ?: iph->daddr;
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skb_dst_drop(skb);
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err = ip_route_input(skb, nhaddr, iph->saddr, 0, skb->dev);
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if (err)
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goto drop;
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return dst_input(skb);
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drop:
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kfree_skb(skb);
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return -EINVAL;
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}
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static int input_action_end_dt6(struct sk_buff *skb,
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struct seg6_local_lwt *slwt)
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{
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if (!decap_and_validate(skb, IPPROTO_IPV6))
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goto drop;
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if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
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goto drop;
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lookup_nexthop(skb, NULL, slwt->table);
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return dst_input(skb);
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drop:
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kfree_skb(skb);
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return -EINVAL;
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}
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/* push an SRH on top of the current one */
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static int input_action_end_b6(struct sk_buff *skb, struct seg6_local_lwt *slwt)
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{
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@ -329,11 +456,31 @@ static struct seg6_action_desc seg6_action_table[] = {
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.attrs = (1 << SEG6_LOCAL_NH6),
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.input = input_action_end_x,
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},
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{
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.action = SEG6_LOCAL_ACTION_END_T,
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.attrs = (1 << SEG6_LOCAL_TABLE),
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.input = input_action_end_t,
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},
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{
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.action = SEG6_LOCAL_ACTION_END_DX2,
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.attrs = (1 << SEG6_LOCAL_OIF),
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.input = input_action_end_dx2,
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},
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{
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.action = SEG6_LOCAL_ACTION_END_DX6,
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.attrs = (1 << SEG6_LOCAL_NH6),
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.input = input_action_end_dx6,
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},
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{
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.action = SEG6_LOCAL_ACTION_END_DX4,
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.attrs = (1 << SEG6_LOCAL_NH4),
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.input = input_action_end_dx4,
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},
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{
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.action = SEG6_LOCAL_ACTION_END_DT6,
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.attrs = (1 << SEG6_LOCAL_TABLE),
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.input = input_action_end_dt6,
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},
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{
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.action = SEG6_LOCAL_ACTION_END_B6,
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.attrs = (1 << SEG6_LOCAL_SRH),
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