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 _UAPI_LINUX_SEG6_IPTUNNEL_H 15 #define _UAPI_LINUX_SEG6_IPTUNNEL_H 16 17 #include <linux/seg6.h> /* For struct ipv6_sr_hdr. */ 18 19 enum { 20 SEG6_IPTUNNEL_UNSPEC, 21 SEG6_IPTUNNEL_SRH, 22 __SEG6_IPTUNNEL_MAX, 23 }; 24 #define SEG6_IPTUNNEL_MAX (__SEG6_IPTUNNEL_MAX - 1) 25 26 struct seg6_iptunnel_encap { 27 int mode; 28 struct ipv6_sr_hdr srh[0]; 29 }; 30 31 #define SEG6_IPTUN_ENCAP_SIZE(x) ((sizeof(*x)) + (((x)->srh->hdrlen + 1) << 3)) 32 33 enum { 34 SEG6_IPTUN_MODE_INLINE, 35 SEG6_IPTUN_MODE_ENCAP, 36 SEG6_IPTUN_MODE_L2ENCAP, 37 }; 38 39 #ifdef __KERNEL__ 40 41 static inline size_t seg6_lwt_headroom(struct seg6_iptunnel_encap *tuninfo) 42 { 43 int head = 0; 44 45 switch (tuninfo->mode) { 46 case SEG6_IPTUN_MODE_INLINE: 47 break; 48 case SEG6_IPTUN_MODE_ENCAP: 49 head = sizeof(struct ipv6hdr); 50 break; 51 case SEG6_IPTUN_MODE_L2ENCAP: 52 return 0; 53 } 54 55 return ((tuninfo->srh->hdrlen + 1) << 3) + head; 56 } 57 58 #endif 59 60 #endif 61