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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* SRv6 definitions
* Copyright (C) 2020 Hiroki Shirokura, LINE Corporation
*/
#ifndef _FRR_SRV6_H
#define _FRR_SRV6_H
#include <zebra.h>
#include "prefix.h"
#include "json.h"
#include <arpa/inet.h>
#include <netinet/in.h>
#define SRV6_MAX_SIDS 16
#define SRV6_MAX_SEGS 8
#define SRV6_LOCNAME_SIZE 256
#define SRH_BASE_HEADER_LENGTH 8
#define SRH_SEGMENT_LENGTH 16
#ifdef __cplusplus
extern "C" {
#endif
#define sid2str(sid, str, size) \
inet_ntop(AF_INET6, sid, str, size)
/* SRv6 flavors manipulation macros */
#define CHECK_SRV6_FLV_OP(OPS,OP) ((OPS) & (1 << OP))
#define SET_SRV6_FLV_OP(OPS,OP) (OPS) |= (1 << OP)
#define UNSET_SRV6_FLV_OP(OPS,OP) (OPS) &= ~(1 << OP)
#define RESET_SRV6_FLV_OP(OPS) (OPS) = 0
/* SRv6 Flavors default values */
#define ZEBRA_DEFAULT_SEG6_LOCAL_FLV_LCBLOCK_LEN 32
#define ZEBRA_DEFAULT_SEG6_LOCAL_FLV_LCNODE_FN_LEN 16
enum seg6_mode_t {
INLINE,
ENCAP,
L2ENCAP,
};
enum seg6local_action_t {
ZEBRA_SEG6_LOCAL_ACTION_UNSPEC = 0,
ZEBRA_SEG6_LOCAL_ACTION_END = 1,
ZEBRA_SEG6_LOCAL_ACTION_END_X = 2,
ZEBRA_SEG6_LOCAL_ACTION_END_T = 3,
ZEBRA_SEG6_LOCAL_ACTION_END_DX2 = 4,
ZEBRA_SEG6_LOCAL_ACTION_END_DX6 = 5,
ZEBRA_SEG6_LOCAL_ACTION_END_DX4 = 6,
ZEBRA_SEG6_LOCAL_ACTION_END_DT6 = 7,
ZEBRA_SEG6_LOCAL_ACTION_END_DT4 = 8,
ZEBRA_SEG6_LOCAL_ACTION_END_B6 = 9,
ZEBRA_SEG6_LOCAL_ACTION_END_B6_ENCAP = 10,
ZEBRA_SEG6_LOCAL_ACTION_END_BM = 11,
ZEBRA_SEG6_LOCAL_ACTION_END_S = 12,
ZEBRA_SEG6_LOCAL_ACTION_END_AS = 13,
ZEBRA_SEG6_LOCAL_ACTION_END_AM = 14,
ZEBRA_SEG6_LOCAL_ACTION_END_BPF = 15,
ZEBRA_SEG6_LOCAL_ACTION_END_DT46 = 16,
};
/* Flavor operations for SRv6 End* Behaviors */
enum seg6local_flavor_op {
ZEBRA_SEG6_LOCAL_FLV_OP_UNSPEC = 0,
/* PSP Flavor as per RFC 8986 section #4.16.1 */
ZEBRA_SEG6_LOCAL_FLV_OP_PSP = 1,
/* USP Flavor as per RFC 8986 section #4.16.2 */
ZEBRA_SEG6_LOCAL_FLV_OP_USP = 2,
/* USD Flavor as per RFC 8986 section #4.16.3 */
ZEBRA_SEG6_LOCAL_FLV_OP_USD = 3,
/* NEXT-C-SID Flavor as per draft-ietf-spring-srv6-srh-compression-03
section 4.1 */
ZEBRA_SEG6_LOCAL_FLV_OP_NEXT_CSID = 4,
};
#define SRV6_SEG_STRLEN 1024
struct seg6_segs {
size_t num_segs;
struct in6_addr segs[256];
};
struct seg6local_flavors_info {
/* Flavor operations */
uint32_t flv_ops;
/* Locator-Block length, expressed in bits */
uint8_t lcblock_len;
/* Locator-Node Function length, expressed in bits */
uint8_t lcnode_func_len;
};
struct seg6_seg_stack {
uint8_t num_segs;
struct in6_addr seg[0]; /* 1 or more segs */
};
struct seg6local_context {
struct in_addr nh4;
struct in6_addr nh6;
uint32_t table;
struct seg6local_flavors_info flv;
};
struct srv6_locator {
char name[SRV6_LOCNAME_SIZE];
struct prefix_ipv6 prefix;
/*
* Bit length of SRv6 locator described in
* draft-ietf-bess-srv6-services-05#section-3.2.1
*/
uint8_t block_bits_length;
uint8_t node_bits_length;
uint8_t function_bits_length;
uint8_t argument_bits_length;
int algonum;
uint64_t current;
bool status_up;
struct list *chunks;
uint8_t flags;
#define SRV6_LOCATOR_USID (1 << 0) /* The SRv6 Locator is a uSID Locator */
QOBJ_FIELDS;
};
DECLARE_QOBJ_TYPE(srv6_locator);
struct srv6_locator_chunk {
char locator_name[SRV6_LOCNAME_SIZE];
struct prefix_ipv6 prefix;
/*
* Bit length of SRv6 locator described in
* draft-ietf-bess-srv6-services-05#section-3.2.1
*/
uint8_t block_bits_length;
uint8_t node_bits_length;
uint8_t function_bits_length;
uint8_t argument_bits_length;
/*
* For Zclient communication values
*/
uint8_t keep;
uint8_t proto;
uint16_t instance;
uint32_t session_id;
uint8_t flags;
};
/*
* SRv6 Endpoint Behavior codepoints, as defined by IANA in
* https://www.iana.org/assignments/segment-routing/segment-routing.xhtml
*/
enum srv6_endpoint_behavior_codepoint {
SRV6_ENDPOINT_BEHAVIOR_RESERVED = 0x0000,
SRV6_ENDPOINT_BEHAVIOR_END = 0x0001,
SRV6_ENDPOINT_BEHAVIOR_END_X = 0x0005,
SRV6_ENDPOINT_BEHAVIOR_END_DT6 = 0x0012,
SRV6_ENDPOINT_BEHAVIOR_END_DT4 = 0x0013,
SRV6_ENDPOINT_BEHAVIOR_END_DT46 = 0x0014,
SRV6_ENDPOINT_BEHAVIOR_END_NEXT_CSID = 0x002B,
SRV6_ENDPOINT_BEHAVIOR_END_X_NEXT_CSID = 0x002C,
SRV6_ENDPOINT_BEHAVIOR_END_DT6_USID = 0x003E,
SRV6_ENDPOINT_BEHAVIOR_END_DT4_USID = 0x003F,
SRV6_ENDPOINT_BEHAVIOR_END_DT46_USID = 0x0040,
SRV6_ENDPOINT_BEHAVIOR_OPAQUE = 0xFFFF,
};
struct nexthop_srv6 {
/* SRv6 localsid info for Endpoint-behaviour */
enum seg6local_action_t seg6local_action;
struct seg6local_context seg6local_ctx;
/* SRv6 Headend-behaviour */
struct seg6_seg_stack *seg6_segs;
};
static inline const char *seg6_mode2str(enum seg6_mode_t mode)
{
switch (mode) {
case INLINE:
return "INLINE";
case ENCAP:
return "ENCAP";
case L2ENCAP:
return "L2ENCAP";
default:
return "unknown";
}
}
static inline bool sid_same(
const struct in6_addr *a,
const struct in6_addr *b)
{
if (!a && !b)
return true;
else if (!(a && b))
return false;
else
return memcmp(a, b, sizeof(struct in6_addr)) == 0;
}
static inline bool sid_diff(
const struct in6_addr *a,
const struct in6_addr *b)
{
return !sid_same(a, b);
}
static inline bool sid_zero(const struct seg6_seg_stack *a)
{
struct in6_addr zero = {};
assert(a);
return sid_same(&a->seg[0], &zero);
}
static inline bool sid_zero_ipv6(const struct in6_addr *a)
{
struct in6_addr zero = {};
return sid_same(&a[0], &zero);
}
static inline void *sid_copy(struct in6_addr *dst,
const struct in6_addr *src)
{
return memcpy(dst, src, sizeof(struct in6_addr));
}
const char *
seg6local_action2str(uint32_t action);
const char *seg6local_context2str(char *str, size_t size,
const struct seg6local_context *ctx,
uint32_t action);
int snprintf_seg6_segs(char *str,
size_t size, const struct seg6_segs *segs);
extern struct srv6_locator *srv6_locator_alloc(const char *name);
extern struct srv6_locator_chunk *srv6_locator_chunk_alloc(void);
extern void srv6_locator_free(struct srv6_locator *locator);
extern void srv6_locator_chunk_free(struct srv6_locator_chunk **chunk);
json_object *srv6_locator_chunk_json(const struct srv6_locator_chunk *chunk);
json_object *srv6_locator_json(const struct srv6_locator *loc);
json_object *srv6_locator_detailed_json(const struct srv6_locator *loc);
json_object *
srv6_locator_chunk_detailed_json(const struct srv6_locator_chunk *chunk);
#ifdef __cplusplus
}
#endif
#endif
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