It allows matching packets based on Segment Routing Header (SRH) information. The implementation considers revision 7 of the SRH draft. https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-07 Currently supported match options include: (1) Next Header (2) Hdr Ext Len (3) Segments Left (4) Last Entry (5) Tag value of SRH
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| 1 | /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ | ||
| 2 | #ifndef _IP6T_SRH_H | ||
| 3 | #define _IP6T_SRH_H | ||
| 4 | |||
| 5 | #include <linux/types.h> | ||
| 6 | #include <linux/netfilter.h> | ||
| 7 | |||
| 8 | /* Values for "mt_flags" field in struct ip6t_srh */ | ||
| 9 | #define IP6T_SRH_NEXTHDR 0x0001 | ||
| 10 | #define IP6T_SRH_LEN_EQ 0x0002 | ||
| 11 | #define IP6T_SRH_LEN_GT 0x0004 | ||
| 12 | #define IP6T_SRH_LEN_LT 0x0008 | ||
| 13 | #define IP6T_SRH_SEGS_EQ 0x0010 | ||
| 14 | #define IP6T_SRH_SEGS_GT 0x0020 | ||
| 15 | #define IP6T_SRH_SEGS_LT 0x0040 | ||
| 16 | #define IP6T_SRH_LAST_EQ 0x0080 | ||
| 17 | #define IP6T_SRH_LAST_GT 0x0100 | ||
| 18 | #define IP6T_SRH_LAST_LT 0x0200 | ||
| 19 | #define IP6T_SRH_TAG 0x0400 | ||
| 20 | #define IP6T_SRH_MASK 0x07FF | ||
| 21 | |||
| 22 | /* Values for "mt_invflags" field in struct ip6t_srh */ | ||
| 23 | #define IP6T_SRH_INV_NEXTHDR 0x0001 | ||
| 24 | #define IP6T_SRH_INV_LEN_EQ 0x0002 | ||
| 25 | #define IP6T_SRH_INV_LEN_GT 0x0004 | ||
| 26 | #define IP6T_SRH_INV_LEN_LT 0x0008 | ||
| 27 | #define IP6T_SRH_INV_SEGS_EQ 0x0010 | ||
| 28 | #define IP6T_SRH_INV_SEGS_GT 0x0020 | ||
| 29 | #define IP6T_SRH_INV_SEGS_LT 0x0040 | ||
| 30 | #define IP6T_SRH_INV_LAST_EQ 0x0080 | ||
| 31 | #define IP6T_SRH_INV_LAST_GT 0x0100 | ||
| 32 | #define IP6T_SRH_INV_LAST_LT 0x0200 | ||
| 33 | #define IP6T_SRH_INV_TAG 0x0400 | ||
| 34 | #define IP6T_SRH_INV_MASK 0x07FF | ||
| 35 | |||
| 36 | /** | ||
| 37 | * struct ip6t_srh - SRH match options | ||
| 38 | * @ next_hdr: Next header field of SRH | ||
| 39 | * @ hdr_len: Extension header length field of SRH | ||
| 40 | * @ segs_left: Segments left field of SRH | ||
| 41 | * @ last_entry: Last entry field of SRH | ||
| 42 | * @ tag: Tag field of SRH | ||
| 43 | * @ mt_flags: match options | ||
| 44 | * @ mt_invflags: Invert the sense of match options | ||
| 45 | */ | ||
| 46 | |||
| 47 | struct ip6t_srh { | ||
| 48 | __u8 next_hdr; | ||
| 49 | __u8 hdr_len; | ||
| 50 | __u8 segs_left; | ||
| 51 | __u8 last_entry; | ||
| 52 | __u16 tag; | ||
| 53 | __u16 mt_flags; | ||
| 54 | __u16 mt_invflags; | ||
| 55 | }; | ||
| 56 | |||
| 57 | #endif /*_IP6T_SRH_H*/ | ||