LXR linux/include/net/seg6.h

   1/* SPDX-License-Identifier: GPL-2.0-or-later */
   2/*
   3 *  SR-IPv6 implementation
   4 *
   5 *  Author:
   6 *  David Lebrun <david.lebrun@uclouvain.be>
   7 */
   8
   9#ifndef _NET_SEG6_H
  10#define _NET_SEG6_H
  11
  12#include <linux/net.h>
  13#include <linux/ipv6.h>
  14#include <linux/seg6.h>
  15#include <linux/rhashtable-types.h>
  16
  17static inline void update_csum_diff4(struct sk_buff *skb, __be32 from,
  18                                     __be32 to)
  19{
  20        __be32 diff[] = { ~from, to };
  21
  22        skb->csum = ~csum_partial((char *)diff, sizeof(diff), ~skb->csum);
  23}
  24
  25static inline void update_csum_diff16(struct sk_buff *skb, __be32 *from,
  26                                      __be32 *to)
  27{
  28        __be32 diff[] = {
  29                ~from[0], ~from[1], ~from[2], ~from[3],
  30                to[0], to[1], to[2], to[3],
  31        };
  32
  33        skb->csum = ~csum_partial((char *)diff, sizeof(diff), ~skb->csum);
  34}
  35
  36struct seg6_pernet_data {
  37        struct mutex lock;
  38        struct in6_addr __rcu *tun_src;
  39#ifdef CONFIG_IPV6_SEG6_HMAC
  40        struct rhashtable hmac_infos;
  41#endif
  42};
  43
  44static inline struct seg6_pernet_data *seg6_pernet(struct net *net)
  45{
  46#if IS_ENABLED(CONFIG_IPV6)
  47        return net->ipv6.seg6_data;
  48#else
  49        return NULL;
  50#endif
  51}
  52
  53extern int seg6_init(void);
  54extern void seg6_exit(void);
  55extern int seg6_iptunnel_init(void);
  56extern void seg6_iptunnel_exit(void);
  57extern int seg6_local_init(void);
  58extern void seg6_local_exit(void);
  59
  60extern bool seg6_validate_srh(struct ipv6_sr_hdr *srh, int len);
  61extern int seg6_do_srh_encap(struct sk_buff *skb, struct ipv6_sr_hdr *osrh,
  62                             int proto);
  63extern int seg6_do_srh_inline(struct sk_buff *skb, struct ipv6_sr_hdr *osrh);
  64extern int seg6_lookup_nexthop(struct sk_buff *skb, struct in6_addr *nhaddr,
  65                               u32 tbl_id);
  66#endif
  67