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-rw-r--r--lib/srv6.h266
1 files changed, 266 insertions, 0 deletions
diff --git a/lib/srv6.h b/lib/srv6.h
new file mode 100644
index 0000000..fb34f86
--- /dev/null
+++ b/lib/srv6.h
@@ -0,0 +1,266 @@
+// 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
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-30 07:21:12 +0000