ipv6: sr: add support for SRH encapsulation and injection with lwtunnels
This patch creates a new type of interfaceless lightweight tunnel (SEG6), enabling the encapsulation and injection of SRH within locally emitted packets and forwarded packets. >From a configuration viewpoint, a seg6 tunnel would be configured as follows: ip -6 ro ad fc00::1/128 encap seg6 mode encap segs fc42::1,fc42::2,fc42::3 dev eth0 Any packet whose destination address is fc00::1 would thus be encapsulated within an outer IPv6 header containing the SRH with three segments, and would actually be routed to the first segment of the list. If `mode inline' was specified instead of `mode encap', then the SRH would be directly inserted after the IPv6 header without outer encapsulation. The inline mode is only available if CONFIG_IPV6_SEG6_INLINE is enabled. This feature was made configurable because direct header insertion may break several mechanisms such as PMTUD or IPSec AH. 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
Родитель
915d7e5e59
Коммит
6c8702c60b
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@ -0,0 +1,6 @@
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#ifndef _LINUX_SEG6_IPTUNNEL_H
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#define _LINUX_SEG6_IPTUNNEL_H
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#include <uapi/linux/seg6_iptunnel.h>
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#endif
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@ -16,6 +16,8 @@
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#include <linux/net.h>
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#include <linux/ipv6.h>
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#include <net/lwtunnel.h>
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#include <linux/seg6.h>
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static inline void update_csum_diff4(struct sk_buff *skb, __be32 from,
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__be32 to)
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@ -48,5 +50,9 @@ static inline struct seg6_pernet_data *seg6_pernet(struct net *net)
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extern int seg6_init(void);
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extern void seg6_exit(void);
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extern int seg6_iptunnel_init(void);
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extern void seg6_iptunnel_exit(void);
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extern bool seg6_validate_srh(struct ipv6_sr_hdr *srh, int len);
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#endif
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@ -9,6 +9,7 @@ enum lwtunnel_encap_types {
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LWTUNNEL_ENCAP_IP,
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LWTUNNEL_ENCAP_ILA,
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LWTUNNEL_ENCAP_IP6,
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LWTUNNEL_ENCAP_SEG6,
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__LWTUNNEL_ENCAP_MAX,
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};
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@ -0,0 +1,44 @@
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/*
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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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#ifndef _UAPI_LINUX_SEG6_IPTUNNEL_H
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#define _UAPI_LINUX_SEG6_IPTUNNEL_H
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enum {
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SEG6_IPTUNNEL_UNSPEC,
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SEG6_IPTUNNEL_SRH,
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__SEG6_IPTUNNEL_MAX,
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};
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#define SEG6_IPTUNNEL_MAX (__SEG6_IPTUNNEL_MAX - 1)
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struct seg6_iptunnel_encap {
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int mode;
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struct ipv6_sr_hdr srh[0];
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};
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#define SEG6_IPTUN_ENCAP_SIZE(x) ((sizeof(*x)) + (((x)->srh->hdrlen + 1) << 3))
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enum {
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SEG6_IPTUN_MODE_INLINE,
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SEG6_IPTUN_MODE_ENCAP,
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};
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static inline size_t seg6_lwt_headroom(struct seg6_iptunnel_encap *tuninfo)
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{
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int encap = (tuninfo->mode == SEG6_IPTUN_MODE_ENCAP);
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return ((tuninfo->srh->hdrlen + 1) << 3) +
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(encap * sizeof(struct ipv6hdr));
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}
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#endif
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@ -39,6 +39,8 @@ static const char *lwtunnel_encap_str(enum lwtunnel_encap_types encap_type)
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return "MPLS";
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case LWTUNNEL_ENCAP_ILA:
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return "ILA";
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case LWTUNNEL_ENCAP_SEG6:
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return "SEG6";
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case LWTUNNEL_ENCAP_IP6:
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case LWTUNNEL_ENCAP_IP:
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case LWTUNNEL_ENCAP_NONE:
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@ -289,4 +289,16 @@ config IPV6_PIMSM_V2
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Support for IPv6 PIM multicast routing protocol PIM-SMv2.
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If unsure, say N.
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config IPV6_SEG6_INLINE
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bool "IPv6: direct Segment Routing Header insertion "
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depends on IPV6
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---help---
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Support for direct insertion of the Segment Routing Header,
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also known as inline mode. Be aware that direct insertion of
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extension headers (as opposed to encapsulation) may break
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multiple mechanisms such as PMTUD or IPSec AH. Use this feature
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only if you know exactly what you are doing.
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If unsure, say N.
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endif # IPV6
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@ -9,7 +9,7 @@ ipv6-objs := af_inet6.o anycast.o ip6_output.o ip6_input.o addrconf.o \
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route.o ip6_fib.o ipv6_sockglue.o ndisc.o udp.o udplite.o \
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raw.o icmp.o mcast.o reassembly.o tcp_ipv6.o ping.o \
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exthdrs.o datagram.o ip6_flowlabel.o inet6_connection_sock.o \
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udp_offload.o seg6.o
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udp_offload.o seg6.o seg6_iptunnel.o
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ipv6-offload := ip6_offload.o tcpv6_offload.o exthdrs_offload.o
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@ -26,6 +26,43 @@
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#include <linux/seg6.h>
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#include <linux/seg6_genl.h>
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bool seg6_validate_srh(struct ipv6_sr_hdr *srh, int len)
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{
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int trailing;
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unsigned int tlv_offset;
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if (srh->type != IPV6_SRCRT_TYPE_4)
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return false;
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if (((srh->hdrlen + 1) << 3) != len)
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return false;
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if (srh->segments_left != srh->first_segment)
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return false;
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tlv_offset = sizeof(*srh) + ((srh->first_segment + 1) << 4);
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trailing = len - tlv_offset;
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if (trailing < 0)
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return false;
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while (trailing) {
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struct sr6_tlv *tlv;
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unsigned int tlv_len;
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tlv = (struct sr6_tlv *)((unsigned char *)srh + tlv_offset);
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tlv_len = sizeof(*tlv) + tlv->len;
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trailing -= tlv_len;
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if (trailing < 0)
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return false;
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tlv_offset += tlv_len;
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}
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return true;
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}
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static struct genl_family seg6_genl_family;
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static const struct nla_policy seg6_genl_policy[SEG6_ATTR_MAX + 1] = {
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@ -198,10 +235,16 @@ int __init seg6_init(void)
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if (err)
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goto out_unregister_genl;
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err = seg6_iptunnel_init();
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if (err)
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goto out_unregister_pernet;
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pr_info("Segment Routing with IPv6\n");
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out:
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return err;
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out_unregister_pernet:
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unregister_pernet_subsys(&ip6_segments_ops);
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out_unregister_genl:
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genl_unregister_family(&seg6_genl_family);
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goto out;
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@ -209,6 +252,7 @@ out_unregister_genl:
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void seg6_exit(void)
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{
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seg6_iptunnel_exit();
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unregister_pernet_subsys(&ip6_segments_ops);
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genl_unregister_family(&seg6_genl_family);
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}
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@ -0,0 +1,410 @@
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/*
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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_iptunnel.h>
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#include <net/addrconf.h>
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#include <net/ip6_route.h>
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#ifdef CONFIG_DST_CACHE
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#include <net/dst_cache.h>
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#endif
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struct seg6_lwt {
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#ifdef CONFIG_DST_CACHE
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struct dst_cache cache;
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#endif
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struct seg6_iptunnel_encap tuninfo[0];
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};
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static inline struct seg6_lwt *seg6_lwt_lwtunnel(struct lwtunnel_state *lwt)
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{
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return (struct seg6_lwt *)lwt->data;
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}
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static inline struct seg6_iptunnel_encap *
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seg6_encap_lwtunnel(struct lwtunnel_state *lwt)
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{
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return seg6_lwt_lwtunnel(lwt)->tuninfo;
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}
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static const struct nla_policy seg6_iptunnel_policy[SEG6_IPTUNNEL_MAX + 1] = {
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[SEG6_IPTUNNEL_SRH] = { .type = NLA_BINARY },
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};
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int nla_put_srh(struct sk_buff *skb, int attrtype,
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struct seg6_iptunnel_encap *tuninfo)
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{
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struct seg6_iptunnel_encap *data;
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struct nlattr *nla;
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int len;
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len = SEG6_IPTUN_ENCAP_SIZE(tuninfo);
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nla = nla_reserve(skb, attrtype, len);
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if (!nla)
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return -EMSGSIZE;
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data = nla_data(nla);
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memcpy(data, tuninfo, len);
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return 0;
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}
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static void set_tun_src(struct net *net, struct net_device *dev,
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struct in6_addr *daddr, struct in6_addr *saddr)
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{
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struct seg6_pernet_data *sdata = seg6_pernet(net);
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struct in6_addr *tun_src;
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rcu_read_lock();
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tun_src = rcu_dereference(sdata->tun_src);
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if (!ipv6_addr_any(tun_src)) {
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memcpy(saddr, tun_src, sizeof(struct in6_addr));
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} else {
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ipv6_dev_get_saddr(net, dev, daddr, IPV6_PREFER_SRC_PUBLIC,
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saddr);
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}
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rcu_read_unlock();
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}
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/* encapsulate an IPv6 packet within an outer IPv6 header with a given SRH */
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static int seg6_do_srh_encap(struct sk_buff *skb, struct ipv6_sr_hdr *osrh)
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{
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struct net *net = dev_net(skb_dst(skb)->dev);
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struct ipv6hdr *hdr, *inner_hdr;
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struct ipv6_sr_hdr *isrh;
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int hdrlen, tot_len, err;
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hdrlen = (osrh->hdrlen + 1) << 3;
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tot_len = hdrlen + sizeof(*hdr);
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err = pskb_expand_head(skb, tot_len, 0, GFP_ATOMIC);
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if (unlikely(err))
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return err;
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inner_hdr = ipv6_hdr(skb);
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skb_push(skb, tot_len);
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skb_reset_network_header(skb);
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skb_mac_header_rebuild(skb);
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hdr = ipv6_hdr(skb);
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/* inherit tc, flowlabel and hlim
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* hlim will be decremented in ip6_forward() afterwards and
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* decapsulation will overwrite inner hlim with outer hlim
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*/
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ip6_flow_hdr(hdr, ip6_tclass(ip6_flowinfo(inner_hdr)),
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ip6_flowlabel(inner_hdr));
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hdr->hop_limit = inner_hdr->hop_limit;
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hdr->nexthdr = NEXTHDR_ROUTING;
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isrh = (void *)hdr + sizeof(*hdr);
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memcpy(isrh, osrh, hdrlen);
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isrh->nexthdr = NEXTHDR_IPV6;
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hdr->daddr = isrh->segments[isrh->first_segment];
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set_tun_src(net, skb->dev, &hdr->daddr, &hdr->saddr);
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skb_postpush_rcsum(skb, hdr, tot_len);
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return 0;
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}
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/* insert an SRH within an IPv6 packet, just after the IPv6 header */
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#ifdef CONFIG_IPV6_SEG6_INLINE
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static int seg6_do_srh_inline(struct sk_buff *skb, struct ipv6_sr_hdr *osrh)
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{
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struct ipv6hdr *hdr, *oldhdr;
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struct ipv6_sr_hdr *isrh;
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int hdrlen, err;
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hdrlen = (osrh->hdrlen + 1) << 3;
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err = pskb_expand_head(skb, hdrlen, 0, GFP_ATOMIC);
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if (unlikely(err))
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return err;
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oldhdr = ipv6_hdr(skb);
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skb_pull(skb, sizeof(struct ipv6hdr));
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skb_postpull_rcsum(skb, skb_network_header(skb),
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sizeof(struct ipv6hdr));
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skb_push(skb, sizeof(struct ipv6hdr) + hdrlen);
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skb_reset_network_header(skb);
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skb_mac_header_rebuild(skb);
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hdr = ipv6_hdr(skb);
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memmove(hdr, oldhdr, sizeof(*hdr));
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isrh = (void *)hdr + sizeof(*hdr);
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memcpy(isrh, osrh, hdrlen);
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isrh->nexthdr = hdr->nexthdr;
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hdr->nexthdr = NEXTHDR_ROUTING;
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isrh->segments[0] = hdr->daddr;
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hdr->daddr = isrh->segments[isrh->first_segment];
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skb_postpush_rcsum(skb, hdr, sizeof(struct ipv6hdr) + hdrlen);
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return 0;
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}
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#endif
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static int seg6_do_srh(struct sk_buff *skb)
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{
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struct dst_entry *dst = skb_dst(skb);
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struct seg6_iptunnel_encap *tinfo;
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int err = 0;
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tinfo = seg6_encap_lwtunnel(dst->lwtstate);
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if (likely(!skb->encapsulation)) {
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skb_reset_inner_headers(skb);
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skb->encapsulation = 1;
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}
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|
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switch (tinfo->mode) {
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#ifdef CONFIG_IPV6_SEG6_INLINE
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case SEG6_IPTUN_MODE_INLINE:
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err = seg6_do_srh_inline(skb, tinfo->srh);
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skb_reset_inner_headers(skb);
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break;
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#endif
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case SEG6_IPTUN_MODE_ENCAP:
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err = seg6_do_srh_encap(skb, tinfo->srh);
|
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break;
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}
|
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|
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if (err)
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return err;
|
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|
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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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|
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skb_set_inner_protocol(skb, skb->protocol);
|
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|
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return 0;
|
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}
|
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|
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int seg6_input(struct sk_buff *skb)
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{
|
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int err;
|
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|
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err = seg6_do_srh(skb);
|
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if (unlikely(err)) {
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kfree_skb(skb);
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return err;
|
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}
|
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|
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skb_dst_drop(skb);
|
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ip6_route_input(skb);
|
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|
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return dst_input(skb);
|
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}
|
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|
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int seg6_output(struct net *net, struct sock *sk, 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 dst_entry *dst = NULL;
|
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struct seg6_lwt *slwt;
|
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int err = -EINVAL;
|
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|
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err = seg6_do_srh(skb);
|
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if (unlikely(err))
|
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goto drop;
|
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|
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slwt = seg6_lwt_lwtunnel(orig_dst->lwtstate);
|
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|
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#ifdef CONFIG_DST_CACHE
|
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dst = dst_cache_get(&slwt->cache);
|
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#endif
|
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|
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if (unlikely(!dst)) {
|
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struct ipv6hdr *hdr = ipv6_hdr(skb);
|
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struct flowi6 fl6;
|
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|
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fl6.daddr = hdr->daddr;
|
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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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|
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dst = ip6_route_output(net, NULL, &fl6);
|
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if (dst->error) {
|
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err = dst->error;
|
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dst_release(dst);
|
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goto drop;
|
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}
|
||||
|
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#ifdef CONFIG_DST_CACHE
|
||||
dst_cache_set_ip6(&slwt->cache, dst, &fl6.saddr);
|
||||
#endif
|
||||
}
|
||||
|
||||
skb_dst_drop(skb);
|
||||
skb_dst_set(skb, dst);
|
||||
|
||||
return dst_output(net, sk, skb);
|
||||
drop:
|
||||
kfree_skb(skb);
|
||||
return err;
|
||||
}
|
||||
|
||||
static int seg6_build_state(struct net_device *dev, struct nlattr *nla,
|
||||
unsigned int family, const void *cfg,
|
||||
struct lwtunnel_state **ts)
|
||||
{
|
||||
struct nlattr *tb[SEG6_IPTUNNEL_MAX + 1];
|
||||
struct seg6_iptunnel_encap *tuninfo;
|
||||
struct lwtunnel_state *newts;
|
||||
int tuninfo_len, min_size;
|
||||
struct seg6_lwt *slwt;
|
||||
int err;
|
||||
|
||||
err = nla_parse_nested(tb, SEG6_IPTUNNEL_MAX, nla,
|
||||
seg6_iptunnel_policy);
|
||||
|
||||
if (err < 0)
|
||||
return err;
|
||||
|
||||
if (!tb[SEG6_IPTUNNEL_SRH])
|
||||
return -EINVAL;
|
||||
|
||||
tuninfo = nla_data(tb[SEG6_IPTUNNEL_SRH]);
|
||||
tuninfo_len = nla_len(tb[SEG6_IPTUNNEL_SRH]);
|
||||
|
||||
/* tuninfo must contain at least the iptunnel encap structure,
|
||||
* the SRH and one segment
|
||||
*/
|
||||
min_size = sizeof(*tuninfo) + sizeof(struct ipv6_sr_hdr) +
|
||||
sizeof(struct in6_addr);
|
||||
if (tuninfo_len < min_size)
|
||||
return -EINVAL;
|
||||
|
||||
switch (tuninfo->mode) {
|
||||
#ifdef CONFIG_IPV6_SEG6_INLINE
|
||||
case SEG6_IPTUN_MODE_INLINE:
|
||||
break;
|
||||
#endif
|
||||
case SEG6_IPTUN_MODE_ENCAP:
|
||||
break;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
/* verify that SRH is consistent */
|
||||
if (!seg6_validate_srh(tuninfo->srh, tuninfo_len - sizeof(*tuninfo)))
|
||||
return -EINVAL;
|
||||
|
||||
newts = lwtunnel_state_alloc(tuninfo_len + sizeof(*slwt));
|
||||
if (!newts)
|
||||
return -ENOMEM;
|
||||
|
||||
slwt = seg6_lwt_lwtunnel(newts);
|
||||
|
||||
#ifdef CONFIG_DST_CACHE
|
||||
err = dst_cache_init(&slwt->cache, GFP_KERNEL);
|
||||
if (err) {
|
||||
kfree(newts);
|
||||
return err;
|
||||
}
|
||||
#endif
|
||||
|
||||
memcpy(&slwt->tuninfo, tuninfo, tuninfo_len);
|
||||
|
||||
newts->type = LWTUNNEL_ENCAP_SEG6;
|
||||
newts->flags |= LWTUNNEL_STATE_OUTPUT_REDIRECT |
|
||||
LWTUNNEL_STATE_INPUT_REDIRECT;
|
||||
newts->headroom = seg6_lwt_headroom(tuninfo);
|
||||
|
||||
*ts = newts;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_DST_CACHE
|
||||
static void seg6_destroy_state(struct lwtunnel_state *lwt)
|
||||
{
|
||||
dst_cache_destroy(&seg6_lwt_lwtunnel(lwt)->cache);
|
||||
}
|
||||
#endif
|
||||
|
||||
static int seg6_fill_encap_info(struct sk_buff *skb,
|
||||
struct lwtunnel_state *lwtstate)
|
||||
{
|
||||
struct seg6_iptunnel_encap *tuninfo = seg6_encap_lwtunnel(lwtstate);
|
||||
|
||||
if (nla_put_srh(skb, SEG6_IPTUNNEL_SRH, tuninfo))
|
||||
return -EMSGSIZE;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int seg6_encap_nlsize(struct lwtunnel_state *lwtstate)
|
||||
{
|
||||
struct seg6_iptunnel_encap *tuninfo = seg6_encap_lwtunnel(lwtstate);
|
||||
|
||||
return nla_total_size(SEG6_IPTUN_ENCAP_SIZE(tuninfo));
|
||||
}
|
||||
|
||||
static int seg6_encap_cmp(struct lwtunnel_state *a, struct lwtunnel_state *b)
|
||||
{
|
||||
struct seg6_iptunnel_encap *a_hdr = seg6_encap_lwtunnel(a);
|
||||
struct seg6_iptunnel_encap *b_hdr = seg6_encap_lwtunnel(b);
|
||||
int len = SEG6_IPTUN_ENCAP_SIZE(a_hdr);
|
||||
|
||||
if (len != SEG6_IPTUN_ENCAP_SIZE(b_hdr))
|
||||
return 1;
|
||||
|
||||
return memcmp(a_hdr, b_hdr, len);
|
||||
}
|
||||
|
||||
static const struct lwtunnel_encap_ops seg6_iptun_ops = {
|
||||
.build_state = seg6_build_state,
|
||||
#ifdef CONFIG_DST_CACHE
|
||||
.destroy_state = seg6_destroy_state,
|
||||
#endif
|
||||
.output = seg6_output,
|
||||
.input = seg6_input,
|
||||
.fill_encap = seg6_fill_encap_info,
|
||||
.get_encap_size = seg6_encap_nlsize,
|
||||
.cmp_encap = seg6_encap_cmp,
|
||||
};
|
||||
|
||||
int __init seg6_iptunnel_init(void)
|
||||
{
|
||||
return lwtunnel_encap_add_ops(&seg6_iptun_ops, LWTUNNEL_ENCAP_SEG6);
|
||||
}
|
||||
|
||||
void seg6_iptunnel_exit(void)
|
||||
{
|
||||
lwtunnel_encap_del_ops(&seg6_iptun_ops, LWTUNNEL_ENCAP_SEG6);
|
||||
}
|
||||
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