include/net/seg6.h

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