Adding upstream version 8.4.4.upstream/8.4.4upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 686 insertions, 0 deletions

diff --git a/lib/prefix.h b/lib/prefix.h
new file mode 100644
index 0000000..b904311
--- /dev/null
+++ b/lib/prefix.h
@@ -0,0 +1,686 @@
+/*
+ * Prefix structure.
+ * Copyright (C) 1998 Kunihiro Ishiguro
+ *
+ * This file is part of GNU Zebra.
+ *
+ * GNU Zebra is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * GNU Zebra is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; see the file COPYING; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef _ZEBRA_PREFIX_H
+#define _ZEBRA_PREFIX_H
+
+#ifdef GNU_LINUX
+#include <net/ethernet.h>
+#else
+#include <netinet/if_ether.h>
+#endif
+#include "sockunion.h"
+#include "ipaddr.h"
+#include "compiler.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef ETH_ALEN
+#define ETH_ALEN 6
+#endif
+
+/* EVPN route types. */
+typedef enum {
+	BGP_EVPN_AD_ROUTE = 1,    /* Ethernet Auto-Discovery (A-D) route */
+	BGP_EVPN_MAC_IP_ROUTE,    /* MAC/IP Advertisement route */
+	BGP_EVPN_IMET_ROUTE,      /* Inclusive Multicast Ethernet Tag route */
+	BGP_EVPN_ES_ROUTE,        /* Ethernet Segment route */
+	BGP_EVPN_IP_PREFIX_ROUTE, /* IP Prefix route */
+} bgp_evpn_route_type;
+
+/* value of first byte of ESI */
+#define ESI_TYPE_ARBITRARY 0  /* */
+#define ESI_TYPE_LACP      1  /* <> */
+#define ESI_TYPE_BRIDGE    2  /* <Root bridge Mac-6B>:<Root Br Priority-2B>:00 */
+#define ESI_TYPE_MAC       3  /* <Syst Mac Add-6B>:<Local Discriminator Value-3B> */
+#define ESI_TYPE_ROUTER    4  /* <RouterId-4B>:<Local Discriminator Value-4B> */
+#define ESI_TYPE_AS        5  /* <AS-4B>:<Local Discriminator Value-4B> */
+
+#define MAX_ESI {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}
+
+
+#define EVPN_ETH_TAG_BYTES 4
+#define ESI_BYTES 10
+#define ESI_STR_LEN (3 * ESI_BYTES)
+#define EVPN_DF_ALG_STR_LEN 24
+
+/* Maximum number of VTEPs per-ES -
+ * XXX - temporary limit for allocating strings etc.
+ */
+#define ES_VTEP_MAX_CNT 10
+#define ES_VTEP_LIST_STR_SZ (ES_VTEP_MAX_CNT * 16)
+
+#define ETHER_ADDR_STRLEN (3*ETH_ALEN)
+/*
+ * there isn't a portable ethernet address type. We define our
+ * own to simplify internal handling
+ */
+struct ethaddr {
+	uint8_t octet[ETH_ALEN];
+} __attribute__((packed));
+
+
+/* length is the number of valuable bits of prefix structure
+* 18 bytes is current length in structure, if address is ipv4
+* 30 bytes is in case of ipv6
+*/
+#define PREFIX_LEN_ROUTE_TYPE_5_IPV4 (18*8)
+#define PREFIX_LEN_ROUTE_TYPE_5_IPV6 (30*8)
+
+typedef struct esi_t_ {
+	uint8_t val[ESI_BYTES];
+} esi_t;
+
+struct evpn_ead_addr {
+	esi_t esi;
+	uint32_t eth_tag;
+	struct ipaddr ip;
+	uint16_t frag_id;
+};
+
+struct evpn_macip_addr {
+	uint32_t eth_tag;
+	uint8_t ip_prefix_length;
+	struct ethaddr mac;
+	struct ipaddr ip;
+};
+
+struct evpn_imet_addr {
+	uint32_t eth_tag;
+	uint8_t ip_prefix_length;
+	struct ipaddr ip;
+};
+
+struct evpn_es_addr {
+	esi_t esi;
+	uint8_t ip_prefix_length;
+	struct ipaddr ip;
+};
+
+struct evpn_prefix_addr {
+	uint32_t eth_tag;
+	uint8_t ip_prefix_length;
+	struct ipaddr ip;
+};
+
+/* EVPN address (RFC 7432) */
+struct evpn_addr {
+	uint8_t route_type;
+	union {
+		struct evpn_ead_addr _ead_addr;
+		struct evpn_macip_addr _macip_addr;
+		struct evpn_imet_addr _imet_addr;
+		struct evpn_es_addr _es_addr;
+		struct evpn_prefix_addr _prefix_addr;
+	} u;
+#define ead_addr u._ead_addr
+#define macip_addr u._macip_addr
+#define imet_addr u._imet_addr
+#define es_addr u._es_addr
+#define prefix_addr u._prefix_addr
+};
+
+/*
+ * A struct prefix contains an address family, a prefix length, and an
+ * address.  This can represent either a 'network prefix' as defined
+ * by CIDR, where the 'host bits' of the prefix are 0
+ * (e.g. AF_INET:10.0.0.0/8), or an address and netmask
+ * (e.g. AF_INET:10.0.0.9/8), such as might be configured on an
+ * interface.
+ */
+
+/* different OSes use different names */
+#if defined(AF_PACKET)
+#define AF_ETHERNET AF_PACKET
+#else
+#if defined(AF_LINK)
+#define AF_ETHERNET AF_LINK
+#endif
+#endif
+
+/* The 'family' in the prefix structure is internal to FRR and need not
+ * map to standard OS AF_ definitions except where needed for interacting
+ * with the kernel. However, AF_ definitions are currently in use and
+ * prevalent across the code. Define a new FRR-specific AF for EVPN to
+ * distinguish between 'ethernet' (MAC-only) and 'evpn' prefixes and
+ * ensure it does not conflict with any OS AF_ definition.
+ */
+#if !defined(AF_EVPN)
+#define AF_EVPN (AF_MAX + 1)
+#endif
+
+#if !defined(AF_FLOWSPEC)
+#define AF_FLOWSPEC (AF_MAX + 2)
+#endif
+
+struct flowspec_prefix {
+	uint8_t family;
+	uint16_t prefixlen; /* length in bytes */
+	uintptr_t ptr;
+};
+
+/* FRR generic prefix structure. */
+struct prefix {
+	uint8_t family;
+	uint16_t prefixlen;
+	union {
+		uint8_t prefix;
+		struct in_addr prefix4;
+		struct in6_addr prefix6;
+		struct {
+			struct in_addr id;
+			struct in_addr adv_router;
+		} lp;
+		struct ethaddr prefix_eth; /* AF_ETHERNET */
+		uint8_t val[16];
+		uint32_t val32[4];
+		uintptr_t ptr;
+		struct evpn_addr prefix_evpn; /* AF_EVPN */
+		struct flowspec_prefix prefix_flowspec; /* AF_FLOWSPEC */
+	} u __attribute__((aligned(8)));
+};
+
+/* IPv4 prefix structure. */
+struct prefix_ipv4 {
+	uint8_t family;
+	uint16_t prefixlen;
+	struct in_addr prefix __attribute__((aligned(8)));
+};
+
+/* IPv6 prefix structure. */
+struct prefix_ipv6 {
+	uint8_t family;
+	uint16_t prefixlen;
+	struct in6_addr prefix __attribute__((aligned(8)));
+};
+
+struct prefix_ls {
+	uint8_t family;
+	uint16_t prefixlen;
+	struct in_addr id __attribute__((aligned(8)));
+	struct in_addr adv_router;
+};
+
+/* Prefix for routing distinguisher. */
+struct prefix_rd {
+	uint8_t family;
+	uint16_t prefixlen;
+	uint8_t val[8] __attribute__((aligned(8)));
+};
+
+/* Prefix for ethernet. */
+struct prefix_eth {
+	uint8_t family;
+	uint16_t prefixlen;
+	struct ethaddr eth_addr __attribute__((aligned(8))); /* AF_ETHERNET */
+};
+
+/* EVPN prefix structure. */
+struct prefix_evpn {
+	uint8_t family;
+	uint16_t prefixlen;
+	struct evpn_addr prefix __attribute__((aligned(8)));
+};
+
+static inline int is_evpn_prefix_ipaddr_none(const struct prefix_evpn *evp)
+{
+	if (evp->prefix.route_type == BGP_EVPN_AD_ROUTE)
+		return IS_IPADDR_NONE(&(evp)->prefix.ead_addr.ip);
+	if (evp->prefix.route_type == BGP_EVPN_MAC_IP_ROUTE)
+		return IS_IPADDR_NONE(&(evp)->prefix.macip_addr.ip);
+	if (evp->prefix.route_type == BGP_EVPN_IMET_ROUTE)
+		return IS_IPADDR_NONE(&(evp)->prefix.imet_addr.ip);
+	if (evp->prefix.route_type == BGP_EVPN_ES_ROUTE)
+		return IS_IPADDR_NONE(&(evp)->prefix.es_addr.ip);
+	if (evp->prefix.route_type == BGP_EVPN_IP_PREFIX_ROUTE)
+		return IS_IPADDR_NONE(&(evp)->prefix.prefix_addr.ip);
+	return 0;
+}
+
+static inline int is_evpn_prefix_ipaddr_v4(const struct prefix_evpn *evp)
+{
+	if (evp->prefix.route_type == BGP_EVPN_AD_ROUTE)
+		return IS_IPADDR_V4(&(evp)->prefix.ead_addr.ip);
+	if (evp->prefix.route_type == BGP_EVPN_MAC_IP_ROUTE)
+		return IS_IPADDR_V4(&(evp)->prefix.macip_addr.ip);
+	if (evp->prefix.route_type == BGP_EVPN_IMET_ROUTE)
+		return IS_IPADDR_V4(&(evp)->prefix.imet_addr.ip);
+	if (evp->prefix.route_type == BGP_EVPN_ES_ROUTE)
+		return IS_IPADDR_V4(&(evp)->prefix.es_addr.ip);
+	if (evp->prefix.route_type == BGP_EVPN_IP_PREFIX_ROUTE)
+		return IS_IPADDR_V4(&(evp)->prefix.prefix_addr.ip);
+	return 0;
+}
+
+static inline int is_evpn_prefix_ipaddr_v6(const struct prefix_evpn *evp)
+{
+	if (evp->prefix.route_type == BGP_EVPN_AD_ROUTE)
+		return IS_IPADDR_V6(&(evp)->prefix.ead_addr.ip);
+	if (evp->prefix.route_type == BGP_EVPN_MAC_IP_ROUTE)
+		return IS_IPADDR_V6(&(evp)->prefix.macip_addr.ip);
+	if (evp->prefix.route_type == BGP_EVPN_IMET_ROUTE)
+		return IS_IPADDR_V6(&(evp)->prefix.imet_addr.ip);
+	if (evp->prefix.route_type == BGP_EVPN_ES_ROUTE)
+		return IS_IPADDR_V6(&(evp)->prefix.es_addr.ip);
+	if (evp->prefix.route_type == BGP_EVPN_IP_PREFIX_ROUTE)
+		return IS_IPADDR_V6(&(evp)->prefix.prefix_addr.ip);
+	return 0;
+}
+
+/* Prefix for a Flowspec entry */
+struct prefix_fs {
+	uint8_t family;
+	uint16_t prefixlen; /* unused */
+	struct flowspec_prefix  prefix __attribute__((aligned(8)));
+};
+
+struct prefix_sg {
+	uint8_t family;
+	uint16_t prefixlen;
+	struct in_addr src __attribute__((aligned(8)));
+	struct in_addr grp;
+};
+
+/* helper to get type safety/avoid casts on calls
+ * (w/o this, functions accepting all prefix types need casts on the caller
+ * side, which strips type safety since the cast will accept any pointer
+ * type.)
+ */
+#ifndef __cplusplus
+#define prefixtype(uname, typename, fieldname) \
+	typename *fieldname;
+#define TRANSPARENT_UNION __attribute__((transparent_union))
+#else
+#define prefixtype(uname, typename, fieldname) \
+	typename *fieldname; \
+	uname(typename *x) { this->fieldname = x; }
+#define TRANSPARENT_UNION
+#endif
+
+union prefixptr {
+	prefixtype(prefixptr, struct prefix,      p)
+	prefixtype(prefixptr, struct prefix_ipv4, p4)
+	prefixtype(prefixptr, struct prefix_ipv6, p6)
+	prefixtype(prefixptr, struct prefix_evpn, evp)
+	prefixtype(prefixptr, struct prefix_fs,   fs)
+	prefixtype(prefixptr, struct prefix_rd,   rd)
+} TRANSPARENT_UNION;
+
+union prefixconstptr {
+	prefixtype(prefixconstptr, const struct prefix,      p)
+	prefixtype(prefixconstptr, const struct prefix_ipv4, p4)
+	prefixtype(prefixconstptr, const struct prefix_ipv6, p6)
+	prefixtype(prefixconstptr, const struct prefix_evpn, evp)
+	prefixtype(prefixconstptr, const struct prefix_fs,   fs)
+	prefixtype(prefixconstptr, const struct prefix_rd,   rd)
+} TRANSPARENT_UNION;
+
+#ifndef INET_ADDRSTRLEN
+#define INET_ADDRSTRLEN 16
+#endif /* INET_ADDRSTRLEN */
+
+#ifndef INET6_ADDRSTRLEN
+/* dead:beef:dead:beef:dead:beef:dead:beef + \0 */
+#define INET6_ADDRSTRLEN 46
+#endif /* INET6_ADDRSTRLEN */
+
+#ifndef INET6_BUFSIZ
+#define INET6_BUFSIZ 53
+#endif /* INET6_BUFSIZ */
+
+/* Maximum string length of the result of prefix2str */
+#define PREFIX_STRLEN 80
+
+/*
+ * Longest possible length of a (S,G) string is 34 bytes
+ * 123.123.123.123 = 15 * 2
+ * (,) = 3
+ * NULL Character at end = 1
+ * (123.123.123.123,123.123.123.123)
+ */
+#define PREFIX_SG_STR_LEN 34
+
+/* Max bit/byte length of IPv4 address. */
+#define IPV4_MAX_BYTELEN    4
+#define IPV4_MAX_BITLEN    32
+#define IPV4_ADDR_CMP(D,S)   memcmp ((D), (S), IPV4_MAX_BYTELEN)
+
+static inline bool ipv4_addr_same(const struct in_addr *a,
+				  const struct in_addr *b)
+{
+	return (a->s_addr == b->s_addr);
+}
+#define IPV4_ADDR_SAME(A,B)  ipv4_addr_same((A), (B))
+
+static inline void ipv4_addr_copy(struct in_addr *dst,
+				  const struct in_addr *src)
+{
+	dst->s_addr = src->s_addr;
+}
+#define IPV4_ADDR_COPY(D,S)  ipv4_addr_copy((D), (S))
+
+#define IPV4_NET0(a) ((((uint32_t)(a)) & 0xff000000) == 0x00000000)
+#define IPV4_NET127(a) ((((uint32_t)(a)) & 0xff000000) == 0x7f000000)
+#define IPV4_LINKLOCAL(a) ((((uint32_t)(a)) & 0xffff0000) == 0xa9fe0000)
+#define IPV4_CLASS_D(a) ((((uint32_t)(a)) & 0xf0000000) == 0xe0000000)
+#define IPV4_CLASS_E(a) ((((uint32_t)(a)) & 0xf0000000) == 0xf0000000)
+#define IPV4_CLASS_DE(a) ((((uint32_t)(a)) & 0xe0000000) == 0xe0000000)
+#define IPV4_MC_LINKLOCAL(a) ((((uint32_t)(a)) & 0xffffff00) == 0xe0000000)
+
+/* Max bit/byte length of IPv6 address. */
+#define IPV6_MAX_BYTELEN    16
+#define IPV6_MAX_BITLEN    128
+#define IPV6_ADDR_CMP(D,S)   memcmp ((D), (S), IPV6_MAX_BYTELEN)
+#define IPV6_ADDR_SAME(D,S)  (memcmp ((D), (S), IPV6_MAX_BYTELEN) == 0)
+#define IPV6_ADDR_COPY(D,S)  memcpy ((D), (S), IPV6_MAX_BYTELEN)
+
+/* Count prefix size from mask length */
+#define PSIZE(a) (((a) + 7) / (8))
+
+#define BSIZE(a) ((a) * (8))
+
+/* Prefix's family member. */
+#define PREFIX_FAMILY(p)  ((p)->family)
+
+/* glibc defines s6_addr32 to __in6_u.__u6_addr32 if __USE_{MISC || GNU} */
+#ifndef s6_addr32
+#define s6_addr32 __u6_addr.__u6_addr32
+#endif /*s6_addr32*/
+
+/* Prototypes. */
+extern int str2family(const char *);
+extern int afi2family(afi_t);
+extern afi_t family2afi(int);
+extern const char *family2str(int family);
+extern const char *safi2str(safi_t safi);
+extern const char *afi2str(afi_t afi);
+
+static inline afi_t prefix_afi(union prefixconstptr pu)
+{
+	return family2afi(pu.p->family);
+}
+
+/*
+ * Check bit of the prefix.
+ *
+ * prefix
+ *    byte buffer
+ *
+ * bit_index
+ *    which bit to fetch from byte buffer, 0 indexed.
+ */
+extern unsigned int prefix_bit(const uint8_t *prefix, const uint16_t bit_index);
+
+extern struct prefix *prefix_new(void);
+extern void prefix_free(struct prefix **p);
+/*
+ * Function to handle prefix_free being used as a del function.
+ */
+extern void prefix_free_lists(void *arg);
+extern const char *prefix_family_str(union prefixconstptr pu);
+extern int prefix_blen(union prefixconstptr pu);
+extern int str2prefix(const char *, struct prefix *);
+
+#define PREFIX2STR_BUFFER  PREFIX_STRLEN
+
+extern void prefix_mcast_inet4_dump(const char *onfail, struct in_addr addr,
+				char *buf, int buf_size);
+extern const char *prefix_sg2str(const struct prefix_sg *sg, char *str);
+extern const char *prefix2str(union prefixconstptr, char *, int);
+extern int evpn_type5_prefix_match(const struct prefix *evpn_pfx,
+				   const struct prefix *match_pfx);
+extern int prefix_match(union prefixconstptr unet, union prefixconstptr upfx);
+extern int prefix_match_network_statement(union prefixconstptr unet,
+					  union prefixconstptr upfx);
+extern int prefix_same(union prefixconstptr ua, union prefixconstptr ub);
+extern int prefix_cmp(union prefixconstptr ua, union prefixconstptr ub);
+extern int prefix_common_bits(union prefixconstptr ua, union prefixconstptr ub);
+extern void prefix_copy(union prefixptr udst, union prefixconstptr usrc);
+extern void apply_mask(union prefixptr pu);
+
+#ifdef __clang_analyzer__
+/* clang-SA doesn't understand transparent unions, making it think that the
+ * target of prefix_copy is uninitialized.  So just memset the target.
+ * cf. https://bugs.llvm.org/show_bug.cgi?id=42811
+ */
+#define prefix_copy(a, b) ({ memset(a, 0, sizeof(*a)); prefix_copy(a, b); })
+#endif
+
+extern struct prefix *sockunion2hostprefix(const union sockunion *,
+					   struct prefix *p);
+extern void prefix2sockunion(const struct prefix *, union sockunion *);
+
+extern int str2prefix_eth(const char *, struct prefix_eth *);
+
+extern struct prefix_ipv4 *prefix_ipv4_new(void);
+extern void prefix_ipv4_free(struct prefix_ipv4 **p);
+extern int str2prefix_ipv4(const char *, struct prefix_ipv4 *);
+extern void apply_mask_ipv4(struct prefix_ipv4 *);
+
+extern int prefix_ipv4_any(const struct prefix_ipv4 *);
+extern void apply_classful_mask_ipv4(struct prefix_ipv4 *);
+
+extern uint8_t ip_masklen(struct in_addr);
+extern void masklen2ip(const int, struct in_addr *);
+/* given the address of a host on a network and the network mask length,
+ * calculate the broadcast address for that network;
+ * special treatment for /31 according to RFC3021 section 3.3 */
+extern in_addr_t ipv4_broadcast_addr(in_addr_t hostaddr, int masklen);
+
+extern int netmask_str2prefix_str(const char *, const char *, char *, size_t);
+
+extern struct prefix_ipv6 *prefix_ipv6_new(void);
+extern void prefix_ipv6_free(struct prefix_ipv6 **p);
+extern int str2prefix_ipv6(const char *, struct prefix_ipv6 *);
+extern void apply_mask_ipv6(struct prefix_ipv6 *);
+
+extern int ip6_masklen(struct in6_addr);
+extern void masklen2ip6(const int, struct in6_addr *);
+
+extern int is_zero_mac(const struct ethaddr *mac);
+extern bool is_mcast_mac(const struct ethaddr *mac);
+extern bool is_bcast_mac(const struct ethaddr *mac);
+extern int prefix_str2mac(const char *str, struct ethaddr *mac);
+extern char *prefix_mac2str(const struct ethaddr *mac, char *buf, int size);
+
+extern unsigned prefix_hash_key(const void *pp);
+
+extern int str_to_esi(const char *str, esi_t *esi);
+extern char *esi_to_str(const esi_t *esi, char *buf, int size);
+extern char *evpn_es_df_alg2str(uint8_t df_alg, char *buf, int buf_len);
+extern void prefix_evpn_hexdump(const struct prefix_evpn *p);
+extern bool ipv4_unicast_valid(const struct in_addr *addr);
+
+static inline int ipv6_martian(const struct in6_addr *addr)
+{
+	struct in6_addr localhost_addr;
+
+	inet_pton(AF_INET6, "::1", &localhost_addr);
+
+	if (IPV6_ADDR_SAME(&localhost_addr, addr))
+		return 1;
+
+	return 0;
+}
+
+extern int macstr2prefix_evpn(const char *str, struct prefix_evpn *p);
+
+/* NOTE: This routine expects the address argument in network byte order. */
+static inline bool ipv4_martian(const struct in_addr *addr)
+{
+	in_addr_t ip = ntohl(addr->s_addr);
+
+	if (IPV4_NET0(ip) || IPV4_NET127(ip) || !ipv4_unicast_valid(addr)) {
+		return true;
+	}
+	return false;
+}
+
+static inline bool is_default_prefix4(const struct prefix_ipv4 *p)
+{
+	return p && p->family == AF_INET && p->prefixlen == 0
+	       && p->prefix.s_addr == INADDR_ANY;
+}
+
+static inline bool is_default_prefix6(const struct prefix_ipv6 *p)
+{
+	return p && p->family == AF_INET6 && p->prefixlen == 0
+	       && memcmp(&p->prefix, &in6addr_any, sizeof(struct in6_addr))
+			  == 0;
+}
+
+static inline bool is_default_prefix(const struct prefix *p)
+{
+	if (p == NULL)
+		return false;
+
+	switch (p->family) {
+	case AF_INET:
+		return is_default_prefix4((const struct prefix_ipv4 *)p);
+	case AF_INET6:
+		return is_default_prefix6((const struct prefix_ipv6 *)p);
+	}
+
+	return false;
+}
+
+static inline int is_host_route(const struct prefix *p)
+{
+	if (p->family == AF_INET)
+		return (p->prefixlen == IPV4_MAX_BITLEN);
+	else if (p->family == AF_INET6)
+		return (p->prefixlen == IPV6_MAX_BITLEN);
+	return 0;
+}
+
+static inline int is_default_host_route(const struct prefix *p)
+{
+	if (p->family == AF_INET) {
+		return (p->u.prefix4.s_addr == INADDR_ANY &&
+			p->prefixlen == IPV4_MAX_BITLEN);
+	} else if (p->family == AF_INET6) {
+		return ((!memcmp(&p->u.prefix6, &in6addr_any,
+				 sizeof(struct in6_addr))) &&
+			p->prefixlen == IPV6_MAX_BITLEN);
+	}
+	return 0;
+}
+
+static inline bool is_ipv6_global_unicast(const struct in6_addr *p)
+{
+	if (IN6_IS_ADDR_UNSPECIFIED(p) || IN6_IS_ADDR_LOOPBACK(p) ||
+	    IN6_IS_ADDR_LINKLOCAL(p) || IN6_IS_ADDR_MULTICAST(p))
+		return false;
+
+	return true;
+}
+
+/* IPv6 scope values, usable for IPv4 too (cf. below) */
+/* clang-format off */
+enum {
+	/* 0: reserved */
+	MCAST_SCOPE_IFACE  = 0x1,
+	MCAST_SCOPE_LINK   = 0x2,
+	MCAST_SCOPE_REALM  = 0x3,
+	MCAST_SCOPE_ADMIN  = 0x4,
+	MCAST_SCOPE_SITE   = 0x5,
+	/* 6-7: unassigned */
+	MCAST_SCOPE_ORG    = 0x8,
+	/* 9-d: unassigned */
+	MCAST_SCOPE_GLOBAL = 0xe,
+	/* f: reserved */
+};
+/* clang-format on */
+
+static inline uint8_t ipv6_mcast_scope(const struct in6_addr *addr)
+{
+	return addr->s6_addr[1] & 0xf;
+}
+
+static inline bool ipv6_mcast_nofwd(const struct in6_addr *addr)
+{
+	return (addr->s6_addr[1] & 0xf) <= MCAST_SCOPE_LINK;
+}
+
+static inline bool ipv6_mcast_ssm(const struct in6_addr *addr)
+{
+	uint32_t bits = ntohl(addr->s6_addr32[0]);
+
+	/* ff3x:0000::/32 */
+	return (bits & 0xfff0ffff) == 0xff300000;
+}
+
+static inline uint8_t ipv4_mcast_scope(const struct in_addr *addr)
+{
+	uint32_t bits = ntohl(addr->s_addr);
+
+	/* 224.0.0.0/24 - link scope */
+	if ((bits & 0xffffff00) == 0xe0000000)
+		return MCAST_SCOPE_LINK;
+	/* 239.0.0.0/8 - org scope */
+	if ((bits & 0xff000000) == 0xef000000)
+		return MCAST_SCOPE_ORG;
+
+	return MCAST_SCOPE_GLOBAL;
+}
+
+static inline bool ipv4_mcast_nofwd(const struct in_addr *addr)
+{
+	uint32_t bits = ntohl(addr->s_addr);
+
+	/* 224.0.0.0/24 */
+	return (bits & 0xffffff00) == 0xe0000000;
+}
+
+static inline bool ipv4_mcast_ssm(const struct in_addr *addr)
+{
+	uint32_t bits = ntohl(addr->s_addr);
+
+	/* 232.0.0.0/8 */
+	return (bits & 0xff000000) == 0xe8000000;
+}
+
+#ifdef _FRR_ATTRIBUTE_PRINTFRR
+#pragma FRR printfrr_ext "%pEA"  (struct ethaddr *)
+
+#pragma FRR printfrr_ext "%pI4"  (struct in_addr *)
+#pragma FRR printfrr_ext "%pI4"  (in_addr_t *)
+
+#pragma FRR printfrr_ext "%pI6"  (struct in6_addr *)
+
+#pragma FRR printfrr_ext "%pFX"  (struct prefix *)
+#pragma FRR printfrr_ext "%pFX"  (struct prefix_ipv4 *)
+#pragma FRR printfrr_ext "%pFX"  (struct prefix_ipv6 *)
+#pragma FRR printfrr_ext "%pFX"  (struct prefix_eth *)
+#pragma FRR printfrr_ext "%pFX"  (struct prefix_evpn *)
+#pragma FRR printfrr_ext "%pFX"  (struct prefix_fs *)
+#pragma FRR printfrr_ext "%pRD"  (struct prefix_rd *)
+
+#pragma FRR printfrr_ext "%pPSG4" (struct prefix_sg *)
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _ZEBRA_PREFIX_H */