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 <net/lwtunnel.h>
  20 #include <linux/seg6.h>
  21 #include <linux/rhashtable-types.h>
  22
  23 static inline void update_csum_diff4(struct sk_buff *skb, __be32 from,
  24                                      __be32 to)
  25 {
  26         __be32 diff[] = { ~from, to };
  27
  28         skb->csum = ~csum_partial((char *)diff, sizeof(diff), ~skb->csum);
  29 }
  30
  31 static inline void update_csum_diff16(struct sk_buff *skb, __be32 *from,
  32                                       __be32 *to)
  33 {
  34         __be32 diff[] = {
  35                 ~from[0], ~from[1], ~from[2], ~from[3],
  36                 to[0], to[1], to[2], to[3],
  37         };
  38
  39         skb->csum = ~csum_partial((char *)diff, sizeof(diff), ~skb->csum);
  40 }
  41
  42 struct seg6_pernet_data {
  43         struct mutex lock;
  44         struct in6_addr __rcu *tun_src;
  45 #ifdef CONFIG_IPV6_SEG6_HMAC
  46         struct rhashtable hmac_infos;
  47 #endif
  48 };
  49
  50 static inline struct seg6_pernet_data *seg6_pernet(struct net *net)
  51 {
  52 #if IS_ENABLED(CONFIG_IPV6)
  53         return net->ipv6.seg6_data;
  54 #else
  55         return NULL;
  56 #endif
  57 }
  58
  59 extern int seg6_init(void);
  60 extern void seg6_exit(void);
  61 extern int seg6_iptunnel_init(void);
  62 extern void seg6_iptunnel_exit(void);
  63 extern int seg6_local_init(void);
  64 extern void seg6_local_exit(void);
  65
  66 extern bool seg6_validate_srh(struct ipv6_sr_hdr *srh, int len);
  67 extern int seg6_do_srh_encap(struct sk_buff *skb, struct ipv6_sr_hdr *osrh,
  68                              int proto);
  69 extern int seg6_do_srh_inline(struct sk_buff *skb, struct ipv6_sr_hdr *osrh);
  70 extern int seg6_lookup_nexthop(struct sk_buff *skb, struct in6_addr *nhaddr,
  71                                u32 tbl_id);
  72 #endif