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.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 return net->ipv6.seg6_data; 53 } 54 55 extern int seg6_init(void); 56 extern void seg6_exit(void); 57 extern int seg6_iptunnel_init(void); 58 extern void seg6_iptunnel_exit(void); 59 extern int seg6_local_init(void); 60 extern void seg6_local_exit(void); 61 62 extern bool seg6_validate_srh(struct ipv6_sr_hdr *srh, int len); 63 extern int seg6_do_srh_encap(struct sk_buff *skb, struct ipv6_sr_hdr *osrh, 64 int proto); 65 extern int seg6_do_srh_inline(struct sk_buff *skb, struct ipv6_sr_hdr *osrh); 66 67 #endif 68