767 lines
16 KiB
C
767 lines
16 KiB
C
/*
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* SR-IPv6 implementation
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*
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* Author:
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* David Lebrun <david.lebrun@uclouvain.be>
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*
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/types.h>
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#include <linux/skbuff.h>
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#include <linux/net.h>
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#include <linux/module.h>
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#include <net/ip.h>
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#include <net/lwtunnel.h>
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#include <net/netevent.h>
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#include <net/netns/generic.h>
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#include <net/ip6_fib.h>
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#include <net/route.h>
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#include <net/seg6.h>
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#include <linux/seg6.h>
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#include <linux/seg6_local.h>
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#include <net/addrconf.h>
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#include <net/ip6_route.h>
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#include <net/dst_cache.h>
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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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struct seg6_local_lwt;
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struct seg6_action_desc {
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int action;
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unsigned long attrs;
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int (*input)(struct sk_buff *skb, struct seg6_local_lwt *slwt);
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int static_headroom;
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};
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struct seg6_local_lwt {
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int action;
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struct ipv6_sr_hdr *srh;
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int table;
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struct in_addr nh4;
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struct in6_addr nh6;
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int iif;
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int oif;
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int headroom;
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struct seg6_action_desc *desc;
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};
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static struct seg6_local_lwt *seg6_local_lwtunnel(struct lwtunnel_state *lwt)
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{
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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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{
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struct seg6_action_desc *desc;
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int i, count;
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count = sizeof(seg6_action_table) / sizeof(struct seg6_action_desc);
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for (i = 0; i < count; i++) {
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desc = &seg6_action_table[i];
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if (desc->action == action)
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return desc;
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}
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return NULL;
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}
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static int seg6_local_input(struct sk_buff *skb)
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{
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struct dst_entry *orig_dst = skb_dst(skb);
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struct seg6_action_desc *desc;
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struct seg6_local_lwt *slwt;
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slwt = seg6_local_lwtunnel(orig_dst->lwtstate);
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desc = slwt->desc;
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return desc->input(skb, slwt);
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}
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static const struct nla_policy seg6_local_policy[SEG6_LOCAL_MAX + 1] = {
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[SEG6_LOCAL_ACTION] = { .type = NLA_U32 },
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[SEG6_LOCAL_SRH] = { .type = NLA_BINARY },
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[SEG6_LOCAL_TABLE] = { .type = NLA_U32 },
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[SEG6_LOCAL_NH4] = { .type = NLA_BINARY,
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.len = sizeof(struct in_addr) },
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[SEG6_LOCAL_NH6] = { .type = NLA_BINARY,
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.len = sizeof(struct in6_addr) },
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[SEG6_LOCAL_IIF] = { .type = NLA_U32 },
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[SEG6_LOCAL_OIF] = { .type = NLA_U32 },
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};
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static int parse_nla_srh(struct nlattr **attrs, struct seg6_local_lwt *slwt)
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{
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struct ipv6_sr_hdr *srh;
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int len;
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srh = nla_data(attrs[SEG6_LOCAL_SRH]);
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len = nla_len(attrs[SEG6_LOCAL_SRH]);
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/* SRH must contain at least one segment */
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if (len < sizeof(*srh) + sizeof(struct in6_addr))
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return -EINVAL;
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if (!seg6_validate_srh(srh, len))
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return -EINVAL;
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slwt->srh = kmalloc(len, GFP_KERNEL);
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if (!slwt->srh)
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return -ENOMEM;
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memcpy(slwt->srh, srh, len);
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slwt->headroom += len;
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return 0;
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}
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static int put_nla_srh(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 nlattr *nla;
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int len;
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srh = slwt->srh;
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len = (srh->hdrlen + 1) << 3;
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nla = nla_reserve(skb, SEG6_LOCAL_SRH, len);
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if (!nla)
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return -EMSGSIZE;
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memcpy(nla_data(nla), srh, len);
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return 0;
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}
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static int cmp_nla_srh(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
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{
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int len = (a->srh->hdrlen + 1) << 3;
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if (len != ((b->srh->hdrlen + 1) << 3))
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return 1;
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return memcmp(a->srh, b->srh, len);
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}
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static int parse_nla_table(struct nlattr **attrs, struct seg6_local_lwt *slwt)
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{
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slwt->table = nla_get_u32(attrs[SEG6_LOCAL_TABLE]);
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return 0;
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}
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static int put_nla_table(struct sk_buff *skb, struct seg6_local_lwt *slwt)
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{
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if (nla_put_u32(skb, SEG6_LOCAL_TABLE, slwt->table))
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return -EMSGSIZE;
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return 0;
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}
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static int cmp_nla_table(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
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{
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if (a->table != b->table)
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return 1;
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return 0;
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}
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static int parse_nla_nh4(struct nlattr **attrs, struct seg6_local_lwt *slwt)
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{
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memcpy(&slwt->nh4, nla_data(attrs[SEG6_LOCAL_NH4]),
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sizeof(struct in_addr));
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return 0;
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}
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static int put_nla_nh4(struct sk_buff *skb, struct seg6_local_lwt *slwt)
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{
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struct nlattr *nla;
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nla = nla_reserve(skb, SEG6_LOCAL_NH4, sizeof(struct in_addr));
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if (!nla)
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return -EMSGSIZE;
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memcpy(nla_data(nla), &slwt->nh4, sizeof(struct in_addr));
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return 0;
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}
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static int cmp_nla_nh4(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
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{
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return memcmp(&a->nh4, &b->nh4, sizeof(struct in_addr));
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}
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static int parse_nla_nh6(struct nlattr **attrs, struct seg6_local_lwt *slwt)
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{
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memcpy(&slwt->nh6, nla_data(attrs[SEG6_LOCAL_NH6]),
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sizeof(struct in6_addr));
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return 0;
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}
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static int put_nla_nh6(struct sk_buff *skb, struct seg6_local_lwt *slwt)
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{
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struct nlattr *nla;
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nla = nla_reserve(skb, SEG6_LOCAL_NH6, sizeof(struct in6_addr));
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if (!nla)
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return -EMSGSIZE;
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memcpy(nla_data(nla), &slwt->nh6, sizeof(struct in6_addr));
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return 0;
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}
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static int cmp_nla_nh6(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
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{
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return memcmp(&a->nh6, &b->nh6, sizeof(struct in6_addr));
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}
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static int parse_nla_iif(struct nlattr **attrs, struct seg6_local_lwt *slwt)
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{
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slwt->iif = nla_get_u32(attrs[SEG6_LOCAL_IIF]);
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return 0;
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}
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static int put_nla_iif(struct sk_buff *skb, struct seg6_local_lwt *slwt)
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{
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if (nla_put_u32(skb, SEG6_LOCAL_IIF, slwt->iif))
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return -EMSGSIZE;
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return 0;
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}
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static int cmp_nla_iif(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
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{
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if (a->iif != b->iif)
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return 1;
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return 0;
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}
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static int parse_nla_oif(struct nlattr **attrs, struct seg6_local_lwt *slwt)
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|
{
|
|
slwt->oif = nla_get_u32(attrs[SEG6_LOCAL_OIF]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int put_nla_oif(struct sk_buff *skb, struct seg6_local_lwt *slwt)
|
|
{
|
|
if (nla_put_u32(skb, SEG6_LOCAL_OIF, slwt->oif))
|
|
return -EMSGSIZE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cmp_nla_oif(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
|
|
{
|
|
if (a->oif != b->oif)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct seg6_action_param {
|
|
int (*parse)(struct nlattr **attrs, struct seg6_local_lwt *slwt);
|
|
int (*put)(struct sk_buff *skb, struct seg6_local_lwt *slwt);
|
|
int (*cmp)(struct seg6_local_lwt *a, struct seg6_local_lwt *b);
|
|
};
|
|
|
|
static struct seg6_action_param seg6_action_params[SEG6_LOCAL_MAX + 1] = {
|
|
[SEG6_LOCAL_SRH] = { .parse = parse_nla_srh,
|
|
.put = put_nla_srh,
|
|
.cmp = cmp_nla_srh },
|
|
|
|
[SEG6_LOCAL_TABLE] = { .parse = parse_nla_table,
|
|
.put = put_nla_table,
|
|
.cmp = cmp_nla_table },
|
|
|
|
[SEG6_LOCAL_NH4] = { .parse = parse_nla_nh4,
|
|
.put = put_nla_nh4,
|
|
.cmp = cmp_nla_nh4 },
|
|
|
|
[SEG6_LOCAL_NH6] = { .parse = parse_nla_nh6,
|
|
.put = put_nla_nh6,
|
|
.cmp = cmp_nla_nh6 },
|
|
|
|
[SEG6_LOCAL_IIF] = { .parse = parse_nla_iif,
|
|
.put = put_nla_iif,
|
|
.cmp = cmp_nla_iif },
|
|
|
|
[SEG6_LOCAL_OIF] = { .parse = parse_nla_oif,
|
|
.put = put_nla_oif,
|
|
.cmp = cmp_nla_oif },
|
|
};
|
|
|
|
static int parse_nla_action(struct nlattr **attrs, struct seg6_local_lwt *slwt)
|
|
{
|
|
struct seg6_action_param *param;
|
|
struct seg6_action_desc *desc;
|
|
int i, err;
|
|
|
|
desc = __get_action_desc(slwt->action);
|
|
if (!desc)
|
|
return -EINVAL;
|
|
|
|
if (!desc->input)
|
|
return -EOPNOTSUPP;
|
|
|
|
slwt->desc = desc;
|
|
slwt->headroom += desc->static_headroom;
|
|
|
|
for (i = 0; i < SEG6_LOCAL_MAX + 1; i++) {
|
|
if (desc->attrs & (1 << i)) {
|
|
if (!attrs[i])
|
|
return -EINVAL;
|
|
|
|
param = &seg6_action_params[i];
|
|
|
|
err = param->parse(attrs, slwt);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int seg6_local_build_state(struct nlattr *nla, unsigned int family,
|
|
const void *cfg, struct lwtunnel_state **ts,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct nlattr *tb[SEG6_LOCAL_MAX + 1];
|
|
struct lwtunnel_state *newts;
|
|
struct seg6_local_lwt *slwt;
|
|
int err;
|
|
|
|
err = nla_parse_nested(tb, SEG6_LOCAL_MAX, nla, seg6_local_policy,
|
|
extack);
|
|
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (!tb[SEG6_LOCAL_ACTION])
|
|
return -EINVAL;
|
|
|
|
newts = lwtunnel_state_alloc(sizeof(*slwt));
|
|
if (!newts)
|
|
return -ENOMEM;
|
|
|
|
slwt = seg6_local_lwtunnel(newts);
|
|
slwt->action = nla_get_u32(tb[SEG6_LOCAL_ACTION]);
|
|
|
|
err = parse_nla_action(tb, slwt);
|
|
if (err < 0)
|
|
goto out_free;
|
|
|
|
newts->type = LWTUNNEL_ENCAP_SEG6_LOCAL;
|
|
newts->flags = LWTUNNEL_STATE_INPUT_REDIRECT;
|
|
newts->headroom = slwt->headroom;
|
|
|
|
*ts = newts;
|
|
|
|
return 0;
|
|
|
|
out_free:
|
|
kfree(slwt->srh);
|
|
kfree(newts);
|
|
return err;
|
|
}
|
|
|
|
static void seg6_local_destroy_state(struct lwtunnel_state *lwt)
|
|
{
|
|
struct seg6_local_lwt *slwt = seg6_local_lwtunnel(lwt);
|
|
|
|
kfree(slwt->srh);
|
|
}
|
|
|
|
static int seg6_local_fill_encap(struct sk_buff *skb,
|
|
struct lwtunnel_state *lwt)
|
|
{
|
|
struct seg6_local_lwt *slwt = seg6_local_lwtunnel(lwt);
|
|
struct seg6_action_param *param;
|
|
int i, err;
|
|
|
|
if (nla_put_u32(skb, SEG6_LOCAL_ACTION, slwt->action))
|
|
return -EMSGSIZE;
|
|
|
|
for (i = 0; i < SEG6_LOCAL_MAX + 1; i++) {
|
|
if (slwt->desc->attrs & (1 << i)) {
|
|
param = &seg6_action_params[i];
|
|
err = param->put(skb, slwt);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int seg6_local_get_encap_size(struct lwtunnel_state *lwt)
|
|
{
|
|
struct seg6_local_lwt *slwt = seg6_local_lwtunnel(lwt);
|
|
unsigned long attrs;
|
|
int nlsize;
|
|
|
|
nlsize = nla_total_size(4); /* action */
|
|
|
|
attrs = slwt->desc->attrs;
|
|
|
|
if (attrs & (1 << SEG6_LOCAL_SRH))
|
|
nlsize += nla_total_size((slwt->srh->hdrlen + 1) << 3);
|
|
|
|
if (attrs & (1 << SEG6_LOCAL_TABLE))
|
|
nlsize += nla_total_size(4);
|
|
|
|
if (attrs & (1 << SEG6_LOCAL_NH4))
|
|
nlsize += nla_total_size(4);
|
|
|
|
if (attrs & (1 << SEG6_LOCAL_NH6))
|
|
nlsize += nla_total_size(16);
|
|
|
|
if (attrs & (1 << SEG6_LOCAL_IIF))
|
|
nlsize += nla_total_size(4);
|
|
|
|
if (attrs & (1 << SEG6_LOCAL_OIF))
|
|
nlsize += nla_total_size(4);
|
|
|
|
return nlsize;
|
|
}
|
|
|
|
static int seg6_local_cmp_encap(struct lwtunnel_state *a,
|
|
struct lwtunnel_state *b)
|
|
{
|
|
struct seg6_local_lwt *slwt_a, *slwt_b;
|
|
struct seg6_action_param *param;
|
|
int i;
|
|
|
|
slwt_a = seg6_local_lwtunnel(a);
|
|
slwt_b = seg6_local_lwtunnel(b);
|
|
|
|
if (slwt_a->action != slwt_b->action)
|
|
return 1;
|
|
|
|
if (slwt_a->desc->attrs != slwt_b->desc->attrs)
|
|
return 1;
|
|
|
|
for (i = 0; i < SEG6_LOCAL_MAX + 1; i++) {
|
|
if (slwt_a->desc->attrs & (1 << i)) {
|
|
param = &seg6_action_params[i];
|
|
if (param->cmp(slwt_a, slwt_b))
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct lwtunnel_encap_ops seg6_local_ops = {
|
|
.build_state = seg6_local_build_state,
|
|
.destroy_state = seg6_local_destroy_state,
|
|
.input = seg6_local_input,
|
|
.fill_encap = seg6_local_fill_encap,
|
|
.get_encap_size = seg6_local_get_encap_size,
|
|
.cmp_encap = seg6_local_cmp_encap,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
int __init seg6_local_init(void)
|
|
{
|
|
return lwtunnel_encap_add_ops(&seg6_local_ops,
|
|
LWTUNNEL_ENCAP_SEG6_LOCAL);
|
|
}
|
|
|
|
void seg6_local_exit(void)
|
|
{
|
|
lwtunnel_encap_del_ops(&seg6_local_ops, LWTUNNEL_ENCAP_SEG6_LOCAL);
|
|
}
|