ipv6: sr: implement several seg6local actions
This patch implements the following seg6local actions. - SEG6_LOCAL_ACTION_END: regular SRH processing. The DA of the packet is updated to the next segment and forwarded accordingly. - SEG6_LOCAL_ACTION_END_X: same as above, except that the packet is forwarded to the specified IPv6 next-hop. - SEG6_LOCAL_ACTION_END_DX6: decapsulate the packet and forward to inner IPv6 packet to the specified IPv6 next-hop. - SEG6_LOCAL_ACTION_END_B6: insert the specified SRH directly after the IPv6 header of the packet. - SEG6_LOCAL_ACTION_END_B6_ENCAP: encapsulate the packet within an outer IPv6 header, containing the specified SRH. 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
2d9cc60aee
commit
140f04c33b
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@ -58,11 +58,282 @@ static struct seg6_local_lwt *seg6_local_lwtunnel(struct lwtunnel_state *lwt)
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return (struct seg6_local_lwt *)lwt->data;
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}
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static struct ipv6_sr_hdr *get_srh(struct sk_buff *skb)
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{
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struct ipv6_sr_hdr *srh;
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struct ipv6hdr *hdr;
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int len;
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hdr = ipv6_hdr(skb);
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if (hdr->nexthdr != IPPROTO_ROUTING)
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return NULL;
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srh = (struct ipv6_sr_hdr *)(hdr + 1);
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len = (srh->hdrlen + 1) << 3;
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if (!pskb_may_pull(skb, sizeof(*hdr) + len))
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return NULL;
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if (!seg6_validate_srh(srh, len))
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return NULL;
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return srh;
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}
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static struct ipv6_sr_hdr *get_and_validate_srh(struct sk_buff *skb)
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{
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struct ipv6_sr_hdr *srh;
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srh = get_srh(skb);
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if (!srh)
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return NULL;
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if (srh->segments_left == 0)
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return NULL;
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#ifdef CONFIG_IPV6_SEG6_HMAC
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if (!seg6_hmac_validate_skb(skb))
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return NULL;
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#endif
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return srh;
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}
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/* regular endpoint function */
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static int input_action_end(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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struct in6_addr *addr;
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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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srh->segments_left--;
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addr = srh->segments + srh->segments_left;
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ipv6_hdr(skb)->daddr = *addr;
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skb_dst_drop(skb);
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ip6_route_input(skb);
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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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/* regular endpoint, and forward to specified nexthop */
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static int input_action_end_x(struct sk_buff *skb, 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 ipv6_sr_hdr *srh;
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struct dst_entry *dst;
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struct in6_addr *addr;
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struct ipv6hdr *hdr;
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struct flowi6 fl6;
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int flags;
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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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srh->segments_left--;
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addr = srh->segments + srh->segments_left;
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hdr = ipv6_hdr(skb);
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hdr->daddr = *addr;
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skb_dst_drop(skb);
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fl6.flowi6_iif = skb->dev->ifindex;
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fl6.daddr = slwt->nh6;
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fl6.saddr = hdr->saddr;
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fl6.flowlabel = ip6_flowinfo(hdr);
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fl6.flowi6_mark = skb->mark;
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fl6.flowi6_proto = hdr->nexthdr;
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flags = RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_IFACE |
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RT6_LOOKUP_F_REACHABLE;
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dst = ip6_route_input_lookup(net, skb->dev, &fl6, flags);
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if (dst->dev->flags & IFF_LOOPBACK)
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goto drop;
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skb_dst_set(skb, dst);
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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 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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{
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struct net *net = dev_net(skb->dev);
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struct ipv6hdr *inner_hdr;
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struct ipv6_sr_hdr *srh;
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struct dst_entry *dst;
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unsigned int off = 0;
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struct flowi6 fl6;
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bool use_nh;
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int flags;
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/* this function accepts IPv6 encapsulated packets, with either
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* an SRH with SL=0, or no SRH.
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*/
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srh = get_srh(skb);
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if (srh && srh->segments_left > 0)
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goto drop;
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#ifdef CONFIG_IPV6_SEG6_HMAC
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if (srh && !seg6_hmac_validate_skb(skb))
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goto drop;
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#endif
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if (ipv6_find_hdr(skb, &off, IPPROTO_IPV6, NULL, NULL) < 0)
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goto drop;
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if (!pskb_pull(skb, off))
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goto drop;
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skb_postpull_rcsum(skb, skb_network_header(skb), off);
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skb_reset_network_header(skb);
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skb_reset_transport_header(skb);
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skb->encapsulation = 0;
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inner_hdr = ipv6_hdr(skb);
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/* The inner packet is not associated to any local interface,
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* so we do not call netif_rx().
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*
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* If slwt->nh6 is set to ::, then lookup the nexthop for the
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* inner packet's DA. Otherwise, use the specified nexthop.
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*/
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use_nh = !ipv6_addr_any(&slwt->nh6);
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skb_dst_drop(skb);
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fl6.flowi6_iif = skb->dev->ifindex;
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fl6.daddr = use_nh ? slwt->nh6 : inner_hdr->daddr;
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fl6.saddr = inner_hdr->saddr;
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fl6.flowlabel = ip6_flowinfo(inner_hdr);
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fl6.flowi6_mark = skb->mark;
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fl6.flowi6_proto = inner_hdr->nexthdr;
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flags = RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_REACHABLE;
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if (use_nh)
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flags |= RT6_LOOKUP_F_IFACE;
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dst = ip6_route_input_lookup(net, skb->dev, &fl6, flags);
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if (dst->dev->flags & IFF_LOOPBACK)
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goto drop;
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skb_dst_set(skb, dst);
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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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struct ipv6_sr_hdr *srh;
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int err = -EINVAL;
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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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err = seg6_do_srh_inline(skb, slwt->srh);
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if (err)
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goto drop;
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ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
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skb_set_transport_header(skb, sizeof(struct ipv6hdr));
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skb_dst_drop(skb);
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ip6_route_input(skb);
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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 err;
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}
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/* encapsulate within an outer IPv6 header and a specified SRH */
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static int input_action_end_b6_encap(struct sk_buff *skb,
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struct seg6_local_lwt *slwt)
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{
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struct ipv6_sr_hdr *srh;
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struct in6_addr *addr;
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int err = -EINVAL;
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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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srh->segments_left--;
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addr = srh->segments + srh->segments_left;
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ipv6_hdr(skb)->daddr = *addr;
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skb_reset_inner_headers(skb);
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skb->encapsulation = 1;
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err = seg6_do_srh_encap(skb, slwt->srh);
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if (err)
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goto drop;
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ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
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skb_set_transport_header(skb, sizeof(struct ipv6hdr));
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skb_dst_drop(skb);
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ip6_route_input(skb);
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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 err;
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}
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static struct seg6_action_desc seg6_action_table[] = {
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{
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.action = SEG6_LOCAL_ACTION_END,
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.attrs = 0,
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.input = input_action_end,
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},
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{
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.action = SEG6_LOCAL_ACTION_END_X,
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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_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_B6,
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.attrs = (1 << SEG6_LOCAL_SRH),
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.input = input_action_end_b6,
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},
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{
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.action = SEG6_LOCAL_ACTION_END_B6_ENCAP,
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.attrs = (1 << SEG6_LOCAL_SRH),
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.input = input_action_end_b6_encap,
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.static_headroom = sizeof(struct ipv6hdr),
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}
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};
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static struct seg6_action_desc *__get_action_desc(int action)
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