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 17 static 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 25 static 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 36 struct 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 44 static 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 53 extern int seg6_init(void); 54 extern void seg6_exit(void); 55 extern int seg6_iptunnel_init(void); 56 extern void seg6_iptunnel_exit(void); 57 extern int seg6_local_init(void); 58 extern void seg6_local_exit(void); 59 60 extern bool seg6_validate_srh(struct ipv6_sr_hdr *srh, int len, bool reduced); 61 extern struct ipv6_sr_hdr *seg6_get_srh(struct sk_buff *skb, int flags); 62 extern void seg6_icmp_srh(struct sk_buff *skb, struct inet6_skb_parm *opt); 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 extern int seg6_lookup_nexthop(struct sk_buff *skb, struct in6_addr *nhaddr, 67 u32 tbl_id); 68 69 /* If the packet which invoked an ICMP error contains an SRH return 70 * the true destination address from within the SRH, otherwise use the 71 * destination address in the IP header. 72 */ 73 static inline const struct in6_addr *seg6_get_daddr(struct sk_buff *skb, 74 struct inet6_skb_parm *opt) 75 { 76 struct ipv6_sr_hdr *srh; 77 78 if (opt->flags & IP6SKB_SEG6) { 79 srh = (struct ipv6_sr_hdr *)(skb->data + opt->srhoff); 80 return &srh->segments[0]; 81 } 82 83 return NULL; 84 } 85 86 87 #endif 88