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 72