// SPDX-License-Identifier: GPL-2.0-or-later /* * Prefix related functions. * Copyright (C) 1997, 98, 99 Kunihiro Ishiguro */ #include #include "command.h" #include "prefix.h" #include "ipaddr.h" #include "vty.h" #include "sockunion.h" #include "memory.h" #include "log.h" #include "jhash.h" #include "lib_errors.h" #include "printfrr.h" #include "vxlan.h" DEFINE_MTYPE_STATIC(LIB, PREFIX, "Prefix"); DEFINE_MTYPE_STATIC(LIB, PREFIX_FLOWSPEC, "Prefix Flowspec"); /* Maskbit. */ static const uint8_t maskbit[] = {0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; /* Number of bits in prefix type. */ #ifndef PNBBY #define PNBBY 8 #endif /* PNBBY */ #define MASKBIT(offset) ((0xff << (PNBBY - (offset))) & 0xff) int is_zero_mac(const struct ethaddr *mac) { int i = 0; for (i = 0; i < ETH_ALEN; i++) { if (mac->octet[i]) return 0; } return 1; } bool is_bcast_mac(const struct ethaddr *mac) { int i = 0; for (i = 0; i < ETH_ALEN; i++) if (mac->octet[i] != 0xFF) return false; return true; } bool is_mcast_mac(const struct ethaddr *mac) { if ((mac->octet[0] & 0x01) == 0x01) return true; return false; } unsigned int prefix_bit(const uint8_t *prefix, const uint16_t bit_index) { unsigned int offset = bit_index / 8; unsigned int shift = 7 - (bit_index % 8); return (prefix[offset] >> shift) & 1; } int str2family(const char *string) { if (!strcmp("ipv4", string)) return AF_INET; else if (!strcmp("ipv6", string)) return AF_INET6; else if (!strcmp("ethernet", string)) return AF_ETHERNET; else if (!strcmp("evpn", string)) return AF_EVPN; return -1; } const char *family2str(int family) { switch (family) { case AF_INET: return "IPv4"; case AF_INET6: return "IPv6"; case AF_ETHERNET: return "Ethernet"; case AF_EVPN: return "Evpn"; } return "?"; } /* Address Family Identifier to Address Family converter. */ int afi2family(afi_t afi) { if (afi == AFI_IP) return AF_INET; else if (afi == AFI_IP6) return AF_INET6; else if (afi == AFI_L2VPN) return AF_ETHERNET; /* NOTE: EVPN code should NOT use this interface. */ return 0; } afi_t family2afi(int family) { if (family == AF_INET) return AFI_IP; else if (family == AF_INET6) return AFI_IP6; else if (family == AF_ETHERNET || family == AF_EVPN) return AFI_L2VPN; return 0; } const char *afi2str_lower(afi_t afi) { switch (afi) { case AFI_IP: return "ipv4"; case AFI_IP6: return "ipv6"; case AFI_L2VPN: return "l2vpn"; case AFI_MAX: case AFI_UNSPEC: return "bad-value"; } assert(!"Reached end of function we should never reach"); } const char *afi2str(afi_t afi) { switch (afi) { case AFI_IP: return "IPv4"; case AFI_IP6: return "IPv6"; case AFI_L2VPN: return "l2vpn"; case AFI_MAX: case AFI_UNSPEC: return "bad-value"; } assert(!"Reached end of function we should never reach"); } const char *safi2str(safi_t safi) { switch (safi) { case SAFI_UNICAST: return "unicast"; case SAFI_MULTICAST: return "multicast"; case SAFI_MPLS_VPN: return "vpn"; case SAFI_ENCAP: return "encap"; case SAFI_EVPN: return "evpn"; case SAFI_LABELED_UNICAST: return "labeled-unicast"; case SAFI_FLOWSPEC: return "flowspec"; case SAFI_UNSPEC: case SAFI_MAX: return "unknown"; } assert(!"Reached end of function we should never reach"); } /* If n includes p prefix then return 1 else return 0. */ int prefix_match(union prefixconstptr unet, union prefixconstptr upfx) { const struct prefix *n = unet.p; const struct prefix *p = upfx.p; int offset; int shift; const uint8_t *np, *pp; /* If n's prefix is longer than p's one return 0. */ if (n->prefixlen > p->prefixlen) return 0; if (n->family == AF_FLOWSPEC) { /* prefixlen is unused. look at fs prefix len */ if (n->u.prefix_flowspec.family != p->u.prefix_flowspec.family) return 0; if (n->u.prefix_flowspec.prefixlen > p->u.prefix_flowspec.prefixlen) return 0; /* Set both prefix's head pointer. */ np = (const uint8_t *)&n->u.prefix_flowspec.ptr; pp = (const uint8_t *)&p->u.prefix_flowspec.ptr; offset = n->u.prefix_flowspec.prefixlen; while (offset--) if (np[offset] != pp[offset]) return 0; return 1; } /* Set both prefix's head pointer. */ np = n->u.val; pp = p->u.val; offset = n->prefixlen / PNBBY; shift = n->prefixlen % PNBBY; if (shift) if (maskbit[shift] & (np[offset] ^ pp[offset])) return 0; while (offset--) if (np[offset] != pp[offset]) return 0; return 1; } /* * n is a type5 evpn prefix. This function tries to see if there is an * ip-prefix within n which matches prefix p * If n includes p prefix then return 1 else return 0. */ int evpn_type5_prefix_match(const struct prefix *n, const struct prefix *p) { int offset; int shift; int prefixlen; const uint8_t *np, *pp; struct prefix_evpn *evp; if (n->family != AF_EVPN) return 0; evp = (struct prefix_evpn *)n; pp = p->u.val; if ((evp->prefix.route_type != 5) || (p->family == AF_INET6 && !is_evpn_prefix_ipaddr_v6(evp)) || (p->family == AF_INET && !is_evpn_prefix_ipaddr_v4(evp)) || (is_evpn_prefix_ipaddr_none(evp))) return 0; prefixlen = evp->prefix.prefix_addr.ip_prefix_length; np = evp->prefix.prefix_addr.ip.ip.addrbytes; /* If n's prefix is longer than p's one return 0. */ if (prefixlen > p->prefixlen) return 0; offset = prefixlen / PNBBY; shift = prefixlen % PNBBY; if (shift) if (maskbit[shift] & (np[offset] ^ pp[offset])) return 0; while (offset--) if (np[offset] != pp[offset]) return 0; return 1; } /* If n includes p then return 1 else return 0. Prefix mask is not considered */ int prefix_match_network_statement(union prefixconstptr unet, union prefixconstptr upfx) { const struct prefix *n = unet.p; const struct prefix *p = upfx.p; int offset; int shift; const uint8_t *np, *pp; /* Set both prefix's head pointer. */ np = n->u.val; pp = p->u.val; offset = n->prefixlen / PNBBY; shift = n->prefixlen % PNBBY; if (shift) if (maskbit[shift] & (np[offset] ^ pp[offset])) return 0; while (offset--) if (np[offset] != pp[offset]) return 0; return 1; } #ifdef __clang_analyzer__ #undef prefix_copy /* cf. prefix.h */ #endif void prefix_copy(union prefixptr udest, union prefixconstptr usrc) { struct prefix *dest = udest.p; const struct prefix *src = usrc.p; dest->family = src->family; dest->prefixlen = src->prefixlen; if (src->family == AF_INET) dest->u.prefix4 = src->u.prefix4; else if (src->family == AF_INET6) dest->u.prefix6 = src->u.prefix6; else if (src->family == AF_ETHERNET) { memcpy(&dest->u.prefix_eth, &src->u.prefix_eth, sizeof(struct ethaddr)); } else if (src->family == AF_EVPN) { memcpy(&dest->u.prefix_evpn, &src->u.prefix_evpn, sizeof(struct evpn_addr)); } else if (src->family == AF_UNSPEC) { dest->u.lp.id = src->u.lp.id; dest->u.lp.adv_router = src->u.lp.adv_router; } else if (src->family == AF_FLOWSPEC) { void *temp; int len; len = src->u.prefix_flowspec.prefixlen; dest->u.prefix_flowspec.prefixlen = src->u.prefix_flowspec.prefixlen; dest->u.prefix_flowspec.family = src->u.prefix_flowspec.family; dest->family = src->family; temp = XCALLOC(MTYPE_PREFIX_FLOWSPEC, len); dest->u.prefix_flowspec.ptr = (uintptr_t)temp; memcpy((void *)dest->u.prefix_flowspec.ptr, (void *)src->u.prefix_flowspec.ptr, len); } else { flog_err(EC_LIB_DEVELOPMENT, "prefix_copy(): Unknown address family %d", src->family); assert(0); } } bool evpn_addr_same(const struct evpn_addr *e1, const struct evpn_addr *e2) { if (e1->route_type != e2->route_type) return false; if (e1->route_type == BGP_EVPN_AD_ROUTE) return (!memcmp(&e1->ead_addr.esi.val, &e2->ead_addr.esi.val, ESI_BYTES) && e1->ead_addr.eth_tag == e2->ead_addr.eth_tag && !ipaddr_cmp(&e1->ead_addr.ip, &e2->ead_addr.ip)); if (e1->route_type == BGP_EVPN_MAC_IP_ROUTE) return (e1->macip_addr.eth_tag == e2->macip_addr.eth_tag && e1->macip_addr.ip_prefix_length == e2->macip_addr.ip_prefix_length && !memcmp(&e1->macip_addr.mac, &e2->macip_addr.mac, ETH_ALEN) && !ipaddr_cmp(&e1->macip_addr.ip, &e2->macip_addr.ip)); if (e1->route_type == BGP_EVPN_IMET_ROUTE) return (e1->imet_addr.eth_tag == e2->imet_addr.eth_tag && e1->imet_addr.ip_prefix_length == e2->imet_addr.ip_prefix_length && !ipaddr_cmp(&e1->imet_addr.ip, &e2->imet_addr.ip)); if (e1->route_type == BGP_EVPN_ES_ROUTE) return (!memcmp(&e1->es_addr.esi.val, &e2->es_addr.esi.val, ESI_BYTES) && e1->es_addr.ip_prefix_length == e2->es_addr.ip_prefix_length && !ipaddr_cmp(&e1->es_addr.ip, &e2->es_addr.ip)); if (e1->route_type == BGP_EVPN_IP_PREFIX_ROUTE) return (e1->prefix_addr.eth_tag == e2->prefix_addr.eth_tag && e1->prefix_addr.ip_prefix_length == e2->prefix_addr.ip_prefix_length && !ipaddr_cmp(&e1->prefix_addr.ip, &e2->prefix_addr.ip)); return true; } /* * Return 1 if the address/netmask contained in the prefix structure * is the same, and else return 0. For this routine, 'same' requires * that not only the prefix length and the network part be the same, * but also the host part. Thus, 10.0.0.1/8 and 10.0.0.2/8 are not * the same. Note that this routine has the same return value sense * as '==' (which is different from prefix_cmp). */ int prefix_same(union prefixconstptr up1, union prefixconstptr up2) { const struct prefix *p1 = up1.p; const struct prefix *p2 = up2.p; if ((p1 && !p2) || (!p1 && p2)) return 0; if (!p1 && !p2) return 1; if (p1->family == p2->family && p1->prefixlen == p2->prefixlen) { if (p1->family == AF_INET) if (IPV4_ADDR_SAME(&p1->u.prefix4, &p2->u.prefix4)) return 1; if (p1->family == AF_INET6) if (IPV6_ADDR_SAME(&p1->u.prefix6.s6_addr, &p2->u.prefix6.s6_addr)) return 1; if (p1->family == AF_ETHERNET) if (!memcmp(&p1->u.prefix_eth, &p2->u.prefix_eth, sizeof(struct ethaddr))) return 1; if (p1->family == AF_EVPN) if (evpn_addr_same(&p1->u.prefix_evpn, &p2->u.prefix_evpn)) return 1; if (p1->family == AF_FLOWSPEC) { if (p1->u.prefix_flowspec.family != p2->u.prefix_flowspec.family) return 0; if (p1->u.prefix_flowspec.prefixlen != p2->u.prefix_flowspec.prefixlen) return 0; if (!memcmp(&p1->u.prefix_flowspec.ptr, &p2->u.prefix_flowspec.ptr, p2->u.prefix_flowspec.prefixlen)) return 1; } } return 0; } /* * Return -1/0/1 comparing the prefixes in a way that gives a full/linear * order. * * Network prefixes are considered the same if the prefix lengths are equal * and the network parts are the same. Host bits (which are considered masked * by the prefix length) are not significant. Thus, 10.0.0.1/8 and * 10.0.0.2/8 are considered equivalent by this routine. Note that * this routine has the same return sense as strcmp (which is different * from prefix_same). */ int prefix_cmp(union prefixconstptr up1, union prefixconstptr up2) { const struct prefix *p1 = up1.p; const struct prefix *p2 = up2.p; int offset; int shift; int i; /* Set both prefix's head pointer. */ const uint8_t *pp1; const uint8_t *pp2; if (p1->family != p2->family) return numcmp(p1->family, p2->family); if (p1->family == AF_FLOWSPEC) { pp1 = (const uint8_t *)p1->u.prefix_flowspec.ptr; pp2 = (const uint8_t *)p2->u.prefix_flowspec.ptr; if (p1->u.prefix_flowspec.family != p2->u.prefix_flowspec.family) return 1; if (p1->u.prefix_flowspec.prefixlen != p2->u.prefix_flowspec.prefixlen) return numcmp(p1->u.prefix_flowspec.prefixlen, p2->u.prefix_flowspec.prefixlen); offset = p1->u.prefix_flowspec.prefixlen; while (offset--) if (pp1[offset] != pp2[offset]) return numcmp(pp1[offset], pp2[offset]); return 0; } pp1 = p1->u.val; pp2 = p2->u.val; if (p1->prefixlen != p2->prefixlen) return numcmp(p1->prefixlen, p2->prefixlen); offset = p1->prefixlen / PNBBY; shift = p1->prefixlen % PNBBY; i = memcmp(pp1, pp2, offset); if (i) return i; /* * At this point offset was the same, if we have shift * that means we still have data to compare, if shift is * 0 then we are at the end of the data structure * and should just return, as that we will be accessing * memory beyond the end of the party zone */ if (shift) return numcmp(pp1[offset] & maskbit[shift], pp2[offset] & maskbit[shift]); return 0; } /* * Count the number of common bits in 2 prefixes. The prefix length is * ignored for this function; the whole prefix is compared. If the prefix * address families don't match, return -1; otherwise the return value is * in range 0 ... maximum prefix length for the address family. */ int prefix_common_bits(union prefixconstptr ua, union prefixconstptr ub) { const struct prefix *p1 = ua.p; const struct prefix *p2 = ub.p; int pos, bit; int length = 0; uint8_t xor ; /* Set both prefix's head pointer. */ const uint8_t *pp1 = p1->u.val; const uint8_t *pp2 = p2->u.val; if (p1->family == AF_INET) length = IPV4_MAX_BYTELEN; if (p1->family == AF_INET6) length = IPV6_MAX_BYTELEN; if (p1->family == AF_ETHERNET) length = ETH_ALEN; if (p1->family == AF_EVPN) length = 8 * sizeof(struct evpn_addr); if (p1->family != p2->family || !length) return -1; for (pos = 0; pos < length; pos++) if (pp1[pos] != pp2[pos]) break; if (pos == length) return pos * 8; xor = pp1[pos] ^ pp2[pos]; for (bit = 0; bit < 8; bit++) if (xor&(1 << (7 - bit))) break; return pos * 8 + bit; } /* Return prefix family type string. */ const char *prefix_family_str(union prefixconstptr pu) { const struct prefix *p = pu.p; if (p->family == AF_INET) return "inet"; if (p->family == AF_INET6) return "inet6"; if (p->family == AF_ETHERNET) return "ether"; if (p->family == AF_EVPN) return "evpn"; return "unspec"; } /* Allocate new prefix_ipv4 structure. */ struct prefix_ipv4 *prefix_ipv4_new(void) { struct prefix_ipv4 *p; /* Call prefix_new to allocate a full-size struct prefix to avoid problems where the struct prefix_ipv4 is cast to struct prefix and unallocated bytes were being referenced (e.g. in structure assignments). */ p = (struct prefix_ipv4 *)prefix_new(); p->family = AF_INET; return p; } /* Free prefix_ipv4 structure. */ void prefix_ipv4_free(struct prefix_ipv4 **p) { prefix_free((struct prefix **)p); } /* If given string is valid return 1 else return 0 */ int str2prefix_ipv4(const char *str, struct prefix_ipv4 *p) { int ret; int plen; char *pnt; char *cp; /* Find slash inside string. */ pnt = strchr(str, '/'); /* String doesn't contail slash. */ if (pnt == NULL) { /* Convert string to prefix. */ ret = inet_pton(AF_INET, str, &p->prefix); if (ret == 0) return 0; /* If address doesn't contain slash we assume it host address. */ p->family = AF_INET; p->prefixlen = IPV4_MAX_BITLEN; return ret; } else { cp = XMALLOC(MTYPE_TMP, (pnt - str) + 1); memcpy(cp, str, pnt - str); *(cp + (pnt - str)) = '\0'; ret = inet_pton(AF_INET, cp, &p->prefix); XFREE(MTYPE_TMP, cp); if (ret == 0) return 0; /* Get prefix length. */ plen = (uint8_t)atoi(++pnt); if (plen > IPV4_MAX_BITLEN) return 0; p->family = AF_INET; p->prefixlen = plen; } return ret; } /* When string format is invalid return 0. */ int str2prefix_eth(const char *str, struct prefix_eth *p) { int ret = 0; int plen = 48; char *pnt; char *cp = NULL; const char *str_addr = str; unsigned int a[6]; int i; bool slash = false; if (!strcmp(str, "any")) { memset(p, 0, sizeof(*p)); p->family = AF_ETHERNET; return 1; } /* Find slash inside string. */ pnt = strchr(str, '/'); if (pnt) { /* Get prefix length. */ plen = (uint8_t)atoi(++pnt); if (plen > 48) { ret = 0; goto done; } cp = XMALLOC(MTYPE_TMP, (pnt - str) + 1); memcpy(cp, str, pnt - str); *(cp + (pnt - str)) = '\0'; str_addr = cp; slash = true; } /* Convert string to prefix. */ if (sscanf(str_addr, "%2x:%2x:%2x:%2x:%2x:%2x", a + 0, a + 1, a + 2, a + 3, a + 4, a + 5) != 6) { ret = 0; goto done; } for (i = 0; i < 6; ++i) { p->eth_addr.octet[i] = a[i] & 0xff; } p->prefixlen = plen; p->family = AF_ETHERNET; /* * special case to allow old configurations to work * Since all zero's is implicitly meant to allow * a comparison to zero, let's assume */ if (!slash && is_zero_mac(&(p->eth_addr))) p->prefixlen = 0; ret = 1; done: XFREE(MTYPE_TMP, cp); return ret; } /* Convert masklen into IP address's netmask (network byte order). */ void masklen2ip(const int masklen, struct in_addr *netmask) { assert(masklen >= 0 && masklen <= IPV4_MAX_BITLEN); /* left shift is only defined for less than the size of the type. * we unconditionally use long long in case the target platform * has defined behaviour for << 32 (or has a 64-bit left shift) */ if (sizeof(unsigned long long) > 4) netmask->s_addr = htonl(0xffffffffULL << (32 - masklen)); else netmask->s_addr = htonl(masklen ? 0xffffffffU << (32 - masklen) : 0); } /* Convert IP address's netmask into integer. We assume netmask is * sequential one. Argument netmask should be network byte order. */ uint8_t ip_masklen(struct in_addr netmask) { uint32_t tmp = ~ntohl(netmask.s_addr); /* * clz: count leading zeroes. sadly, the behaviour of this builtin is * undefined for a 0 argument, even though most CPUs give 32 */ return tmp ? __builtin_clz(tmp) : 32; } /* Apply mask to IPv4 prefix (network byte order). */ void apply_mask_ipv4(struct prefix_ipv4 *p) { struct in_addr mask; masklen2ip(p->prefixlen, &mask); p->prefix.s_addr &= mask.s_addr; } /* If prefix is 0.0.0.0/0 then return 1 else return 0. */ int prefix_ipv4_any(const struct prefix_ipv4 *p) { return (p->prefix.s_addr == INADDR_ANY && p->prefixlen == 0); } /* Allocate a new ip version 6 route */ struct prefix_ipv6 *prefix_ipv6_new(void) { struct prefix_ipv6 *p; /* Allocate a full-size struct prefix to avoid problems with structure size mismatches. */ p = (struct prefix_ipv6 *)prefix_new(); p->family = AF_INET6; return p; } /* Free prefix for IPv6. */ void prefix_ipv6_free(struct prefix_ipv6 **p) { prefix_free((struct prefix **)p); } /* If given string is valid return 1 else return 0 */ int str2prefix_ipv6(const char *str, struct prefix_ipv6 *p) { char *pnt; char *cp; int ret; pnt = strchr(str, '/'); /* If string doesn't contain `/' treat it as host route. */ if (pnt == NULL) { ret = inet_pton(AF_INET6, str, &p->prefix); if (ret == 0) return 0; p->prefixlen = IPV6_MAX_BITLEN; } else { int plen; cp = XMALLOC(MTYPE_TMP, (pnt - str) + 1); memcpy(cp, str, pnt - str); *(cp + (pnt - str)) = '\0'; ret = inet_pton(AF_INET6, cp, &p->prefix); XFREE(MTYPE_TMP, cp); if (ret == 0) return 0; plen = (uint8_t)atoi(++pnt); if (plen > IPV6_MAX_BITLEN) return 0; p->prefixlen = plen; } p->family = AF_INET6; return ret; } /* Convert struct in6_addr netmask into integer. * FIXME return uint8_t as ip_maskleni() does. */ int ip6_masklen(struct in6_addr netmask) { if (netmask.s6_addr32[0] != 0xffffffffU) return __builtin_clz(~ntohl(netmask.s6_addr32[0])); if (netmask.s6_addr32[1] != 0xffffffffU) return __builtin_clz(~ntohl(netmask.s6_addr32[1])) + 32; if (netmask.s6_addr32[2] != 0xffffffffU) return __builtin_clz(~ntohl(netmask.s6_addr32[2])) + 64; if (netmask.s6_addr32[3] != 0xffffffffU) return __builtin_clz(~ntohl(netmask.s6_addr32[3])) + 96; /* note __builtin_clz(0) is undefined */ return 128; } void masklen2ip6(const int masklen, struct in6_addr *netmask) { assert(masklen >= 0 && masklen <= IPV6_MAX_BITLEN); if (masklen == 0) { /* note << 32 is undefined */ memset(netmask, 0, sizeof(*netmask)); } else if (masklen <= 32) { netmask->s6_addr32[0] = htonl(0xffffffffU << (32 - masklen)); netmask->s6_addr32[1] = 0; netmask->s6_addr32[2] = 0; netmask->s6_addr32[3] = 0; } else if (masklen <= 64) { netmask->s6_addr32[0] = 0xffffffffU; netmask->s6_addr32[1] = htonl(0xffffffffU << (64 - masklen)); netmask->s6_addr32[2] = 0; netmask->s6_addr32[3] = 0; } else if (masklen <= 96) { netmask->s6_addr32[0] = 0xffffffffU; netmask->s6_addr32[1] = 0xffffffffU; netmask->s6_addr32[2] = htonl(0xffffffffU << (96 - masklen)); netmask->s6_addr32[3] = 0; } else { netmask->s6_addr32[0] = 0xffffffffU; netmask->s6_addr32[1] = 0xffffffffU; netmask->s6_addr32[2] = 0xffffffffU; netmask->s6_addr32[3] = htonl(0xffffffffU << (128 - masklen)); } } void apply_mask_ipv6(struct prefix_ipv6 *p) { uint8_t *pnt; int index; int offset; index = p->prefixlen / 8; if (index < 16) { pnt = (uint8_t *)&p->prefix; offset = p->prefixlen % 8; pnt[index] &= maskbit[offset]; index++; while (index < 16) pnt[index++] = 0; } } void apply_mask(union prefixptr pu) { struct prefix *p = pu.p; switch (p->family) { case AF_INET: apply_mask_ipv4(pu.p4); break; case AF_INET6: apply_mask_ipv6(pu.p6); break; default: break; } return; } /* Utility function of convert between struct prefix <=> union sockunion. */ struct prefix *sockunion2hostprefix(const union sockunion *su, struct prefix *prefix) { if (su->sa.sa_family == AF_INET) { struct prefix_ipv4 *p; p = prefix ? (struct prefix_ipv4 *)prefix : prefix_ipv4_new(); p->family = AF_INET; p->prefix = su->sin.sin_addr; p->prefixlen = IPV4_MAX_BITLEN; return (struct prefix *)p; } if (su->sa.sa_family == AF_INET6) { struct prefix_ipv6 *p; p = prefix ? (struct prefix_ipv6 *)prefix : prefix_ipv6_new(); p->family = AF_INET6; p->prefixlen = IPV6_MAX_BITLEN; memcpy(&p->prefix, &su->sin6.sin6_addr, sizeof(struct in6_addr)); return (struct prefix *)p; } return NULL; } void prefix2sockunion(const struct prefix *p, union sockunion *su) { memset(su, 0, sizeof(*su)); su->sa.sa_family = p->family; if (p->family == AF_INET) su->sin.sin_addr = p->u.prefix4; if (p->family == AF_INET6) memcpy(&su->sin6.sin6_addr, &p->u.prefix6, sizeof(struct in6_addr)); } int prefix_blen(union prefixconstptr pu) { const struct prefix *p = pu.p; switch (p->family) { case AF_INET: return IPV4_MAX_BYTELEN; case AF_INET6: return IPV6_MAX_BYTELEN; case AF_ETHERNET: return ETH_ALEN; } return 0; } /* Generic function for conversion string to struct prefix. */ int str2prefix(const char *str, struct prefix *p) { int ret; if (!str || !p) return 0; /* First we try to convert string to struct prefix_ipv4. */ ret = str2prefix_ipv4(str, (struct prefix_ipv4 *)p); if (ret) return ret; /* Next we try to convert string to struct prefix_ipv6. */ ret = str2prefix_ipv6(str, (struct prefix_ipv6 *)p); if (ret) return ret; /* Next we try to convert string to struct prefix_eth. */ ret = str2prefix_eth(str, (struct prefix_eth *)p); if (ret) return ret; return 0; } static const char *prefixevpn_ead2str(const struct prefix_evpn *p, char *str, int size) { uint8_t family; char buf[ESI_STR_LEN]; char buf1[INET6_ADDRSTRLEN]; family = IS_IPADDR_V4(&p->prefix.ead_addr.ip) ? AF_INET : AF_INET6; snprintf(str, size, "[%d]:[%u]:[%s]:[%d]:[%s]:[%u]", p->prefix.route_type, p->prefix.ead_addr.eth_tag, esi_to_str(&p->prefix.ead_addr.esi, buf, sizeof(buf)), (family == AF_INET) ? IPV4_MAX_BITLEN : IPV6_MAX_BITLEN, inet_ntop(family, &p->prefix.ead_addr.ip.ipaddr_v4, buf1, sizeof(buf1)), p->prefix.ead_addr.frag_id); return str; } static const char *prefixevpn_macip2str(const struct prefix_evpn *p, char *str, int size) { uint8_t family; char buf1[ETHER_ADDR_STRLEN]; char buf2[PREFIX2STR_BUFFER]; if (is_evpn_prefix_ipaddr_none(p)) snprintf(str, size, "[%d]:[%d]:[%d]:[%s]", p->prefix.route_type, p->prefix.macip_addr.eth_tag, 8 * ETH_ALEN, prefix_mac2str(&p->prefix.macip_addr.mac, buf1, sizeof(buf1))); else { family = is_evpn_prefix_ipaddr_v4(p) ? AF_INET : AF_INET6; snprintf(str, size, "[%d]:[%d]:[%d]:[%s]:[%d]:[%s]", p->prefix.route_type, p->prefix.macip_addr.eth_tag, 8 * ETH_ALEN, prefix_mac2str(&p->prefix.macip_addr.mac, buf1, sizeof(buf1)), family == AF_INET ? IPV4_MAX_BITLEN : IPV6_MAX_BITLEN, inet_ntop(family, &p->prefix.macip_addr.ip.ip.addr, buf2, PREFIX2STR_BUFFER)); } return str; } static const char *prefixevpn_imet2str(const struct prefix_evpn *p, char *str, int size) { uint8_t family; char buf[INET6_ADDRSTRLEN]; family = IS_IPADDR_V4(&p->prefix.imet_addr.ip) ? AF_INET : AF_INET6; snprintf(str, size, "[%d]:[%d]:[%d]:[%s]", p->prefix.route_type, p->prefix.imet_addr.eth_tag, (family == AF_INET) ? IPV4_MAX_BITLEN : IPV6_MAX_BITLEN, inet_ntop(family, &p->prefix.imet_addr.ip.ipaddr_v4, buf, sizeof(buf))); return str; } static const char *prefixevpn_es2str(const struct prefix_evpn *p, char *str, int size) { uint8_t family; char buf[ESI_STR_LEN]; char buf1[INET6_ADDRSTRLEN]; family = IS_IPADDR_V4(&p->prefix.es_addr.ip) ? AF_INET : AF_INET6; snprintf(str, size, "[%d]:[%s]:[%d]:[%s]", p->prefix.route_type, esi_to_str(&p->prefix.es_addr.esi, buf, sizeof(buf)), (family == AF_INET) ? IPV4_MAX_BITLEN : IPV6_MAX_BITLEN, inet_ntop(family, &p->prefix.es_addr.ip.ipaddr_v4, buf1, sizeof(buf1))); return str; } static const char *prefixevpn_prefix2str(const struct prefix_evpn *p, char *str, int size) { uint8_t family; char buf[INET6_ADDRSTRLEN]; family = IS_IPADDR_V4(&p->prefix.prefix_addr.ip) ? AF_INET : AF_INET6; snprintf(str, size, "[%d]:[%d]:[%d]:[%s]", p->prefix.route_type, p->prefix.prefix_addr.eth_tag, p->prefix.prefix_addr.ip_prefix_length, inet_ntop(family, &p->prefix.prefix_addr.ip.ipaddr_v4, buf, sizeof(buf))); return str; } static const char *prefixevpn2str(const struct prefix_evpn *p, char *str, int size) { switch (p->prefix.route_type) { case BGP_EVPN_AD_ROUTE: return prefixevpn_ead2str(p, str, size); case BGP_EVPN_MAC_IP_ROUTE: return prefixevpn_macip2str(p, str, size); case BGP_EVPN_IMET_ROUTE: return prefixevpn_imet2str(p, str, size); case BGP_EVPN_ES_ROUTE: return prefixevpn_es2str(p, str, size); case BGP_EVPN_IP_PREFIX_ROUTE: return prefixevpn_prefix2str(p, str, size); default: snprintf(str, size, "Unsupported EVPN prefix"); break; } return str; } const char *prefix2str(union prefixconstptr pu, char *str, int size) { const struct prefix *p = pu.p; char buf[PREFIX2STR_BUFFER]; int byte, tmp, a, b; bool z = false; size_t l; switch (p->family) { case AF_INET: case AF_INET6: inet_ntop(p->family, &p->u.prefix, buf, sizeof(buf)); l = strlen(buf); buf[l++] = '/'; byte = p->prefixlen; tmp = p->prefixlen - 100; if (tmp >= 0) { buf[l++] = '1'; z = true; byte = tmp; } b = byte % 10; a = byte / 10; if (a || z) buf[l++] = '0' + a; buf[l++] = '0' + b; buf[l] = '\0'; strlcpy(str, buf, size); break; case AF_ETHERNET: snprintf(str, size, "%s/%d", prefix_mac2str(&p->u.prefix_eth, buf, sizeof(buf)), p->prefixlen); break; case AF_EVPN: prefixevpn2str((const struct prefix_evpn *)p, str, size); break; case AF_FLOWSPEC: strlcpy(str, "FS prefix", size); break; default: strlcpy(str, "UNK prefix", size); break; } return str; } static ssize_t prefixhost2str(struct fbuf *fbuf, union prefixconstptr pu) { const struct prefix *p = pu.p; char buf[PREFIX2STR_BUFFER]; switch (p->family) { case AF_INET: case AF_INET6: inet_ntop(p->family, &p->u.prefix, buf, sizeof(buf)); return bputs(fbuf, buf); case AF_ETHERNET: prefix_mac2str(&p->u.prefix_eth, buf, sizeof(buf)); return bputs(fbuf, buf); default: return bprintfrr(fbuf, "{prefix.af=%dPF}", p->family); } } void prefix_mcast_inet4_dump(const char *onfail, struct in_addr addr, char *buf, int buf_size) { int save_errno = errno; if (addr.s_addr == INADDR_ANY) strlcpy(buf, "*", buf_size); else { if (!inet_ntop(AF_INET, &addr, buf, buf_size)) { if (onfail) snprintf(buf, buf_size, "%s", onfail); } } errno = save_errno; } const char *prefix_sg2str(const struct prefix_sg *sg, char *sg_str) { char src_str[INET_ADDRSTRLEN]; char grp_str[INET_ADDRSTRLEN]; prefix_mcast_inet4_dump("", sg->src, src_str, sizeof(src_str)); prefix_mcast_inet4_dump("", sg->grp, grp_str, sizeof(grp_str)); snprintf(sg_str, PREFIX_SG_STR_LEN, "(%s,%s)", src_str, grp_str); return sg_str; } struct prefix *prefix_new(void) { struct prefix *p; p = XCALLOC(MTYPE_PREFIX, sizeof(*p)); return p; } void prefix_free_lists(void *arg) { struct prefix *p = arg; prefix_free(&p); } /* Free prefix structure. */ void prefix_free(struct prefix **p) { XFREE(MTYPE_PREFIX, *p); } /* Utility function to convert ipv4 prefixes to Classful prefixes */ void apply_classful_mask_ipv4(struct prefix_ipv4 *p) { uint32_t destination; destination = ntohl(p->prefix.s_addr); if (p->prefixlen == IPV4_MAX_BITLEN) ; /* do nothing for host routes */ else if (IN_CLASSC(destination)) { p->prefixlen = 24; apply_mask_ipv4(p); } else if (IN_CLASSB(destination)) { p->prefixlen = 16; apply_mask_ipv4(p); } else { p->prefixlen = 8; apply_mask_ipv4(p); } } in_addr_t ipv4_broadcast_addr(in_addr_t hostaddr, int masklen) { struct in_addr mask; masklen2ip(masklen, &mask); return (masklen != IPV4_MAX_BITLEN - 1) ? /* normal case */ (hostaddr | ~mask.s_addr) : /* For prefix 31 return 255.255.255.255 (RFC3021) */ htonl(0xFFFFFFFF); } /* Utility function to convert ipv4 netmask to prefixes ex.) "1.1.0.0" "255.255.0.0" => "1.1.0.0/16" ex.) "1.0.0.0" NULL => "1.0.0.0/8" */ int netmask_str2prefix_str(const char *net_str, const char *mask_str, char *prefix_str, size_t prefix_str_len) { struct in_addr network; struct in_addr mask; uint8_t prefixlen; uint32_t destination; int ret; ret = inet_aton(net_str, &network); if (!ret) return 0; if (mask_str) { ret = inet_aton(mask_str, &mask); if (!ret) return 0; prefixlen = ip_masklen(mask); } else { destination = ntohl(network.s_addr); if (network.s_addr == INADDR_ANY) prefixlen = 0; else if (IN_CLASSC(destination)) prefixlen = 24; else if (IN_CLASSB(destination)) prefixlen = 16; else if (IN_CLASSA(destination)) prefixlen = 8; else return 0; } snprintf(prefix_str, prefix_str_len, "%s/%d", net_str, prefixlen); return 1; } /* converts to internal representation of mac address * returns 1 on success, 0 otherwise * format accepted: AA:BB:CC:DD:EE:FF * if mac parameter is null, then check only */ int prefix_str2mac(const char *str, struct ethaddr *mac) { unsigned int a[6]; int i; if (!str) return 0; if (sscanf(str, "%2x:%2x:%2x:%2x:%2x:%2x", a + 0, a + 1, a + 2, a + 3, a + 4, a + 5) != 6) { /* error in incoming str length */ return 0; } /* valid mac address */ if (!mac) return 1; for (i = 0; i < 6; ++i) mac->octet[i] = a[i] & 0xff; return 1; } char *prefix_mac2str(const struct ethaddr *mac, char *buf, int size) { char *ptr; if (!mac) return NULL; if (!buf) ptr = XMALLOC(MTYPE_TMP, ETHER_ADDR_STRLEN * sizeof(char)); else { assert(size >= ETHER_ADDR_STRLEN); ptr = buf; } snprintf(ptr, (ETHER_ADDR_STRLEN), "%02x:%02x:%02x:%02x:%02x:%02x", (uint8_t)mac->octet[0], (uint8_t)mac->octet[1], (uint8_t)mac->octet[2], (uint8_t)mac->octet[3], (uint8_t)mac->octet[4], (uint8_t)mac->octet[5]); return ptr; } unsigned prefix_hash_key(const void *pp) { struct prefix copy; if (((struct prefix *)pp)->family == AF_FLOWSPEC) { uint32_t len; void *temp; /* make sure *all* unused bits are zero, * particularly including alignment / * padding and unused prefix bytes. */ memset(©, 0, sizeof(copy)); prefix_copy(©, (struct prefix *)pp); len = jhash((void *)copy.u.prefix_flowspec.ptr, copy.u.prefix_flowspec.prefixlen, 0x55aa5a5a); temp = (void *)copy.u.prefix_flowspec.ptr; XFREE(MTYPE_PREFIX_FLOWSPEC, temp); copy.u.prefix_flowspec.ptr = (uintptr_t)NULL; return len; } /* make sure *all* unused bits are zero, particularly including * alignment / * padding and unused prefix bytes. */ memset(©, 0, sizeof(copy)); prefix_copy(©, (struct prefix *)pp); return jhash(©, offsetof(struct prefix, u.prefix) + PSIZE(copy.prefixlen), 0x55aa5a5a); } /* converts to internal representation of esi * returns 1 on success, 0 otherwise * format accepted: aa:aa:aa:aa:aa:aa:aa:aa:aa:aa * if esi parameter is null, then check only */ int str_to_esi(const char *str, esi_t *esi) { int i; unsigned int a[ESI_BYTES]; if (!str) return 0; if (sscanf(str, "%2x:%2x:%2x:%2x:%2x:%2x:%2x:%2x:%2x:%2x", a + 0, a + 1, a + 2, a + 3, a + 4, a + 5, a + 6, a + 7, a + 8, a + 9) != ESI_BYTES) { /* error in incoming str length */ return 0; } /* valid ESI */ if (!esi) return 1; for (i = 0; i < ESI_BYTES; ++i) esi->val[i] = a[i] & 0xff; return 1; } char *esi_to_str(const esi_t *esi, char *buf, int size) { char *ptr; if (!esi) return NULL; if (!buf) ptr = XMALLOC(MTYPE_TMP, ESI_STR_LEN * sizeof(char)); else { assert(size >= ESI_STR_LEN); ptr = buf; } snprintf(ptr, ESI_STR_LEN, "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x", esi->val[0], esi->val[1], esi->val[2], esi->val[3], esi->val[4], esi->val[5], esi->val[6], esi->val[7], esi->val[8], esi->val[9]); return ptr; } char *evpn_es_df_alg2str(uint8_t df_alg, char *buf, int buf_len) { switch (df_alg) { case EVPN_MH_DF_ALG_SERVICE_CARVING: snprintf(buf, buf_len, "service-carving"); break; case EVPN_MH_DF_ALG_HRW: snprintf(buf, buf_len, "HRW"); break; case EVPN_MH_DF_ALG_PREF: snprintf(buf, buf_len, "preference"); break; default: snprintf(buf, buf_len, "unknown %u", df_alg); break; } return buf; } bool ipv4_unicast_valid(const struct in_addr *addr) { in_addr_t ip = ntohl(addr->s_addr); if (IPV4_CLASS_D(ip)) return false; if (IPV4_NET0(ip) || IPV4_NET127(ip) || IPV4_CLASS_E(ip)) { if (cmd_allow_reserved_ranges_get()) return true; else return false; } return true; } static int ipaddr2prefix(const struct ipaddr *ip, uint16_t prefixlen, struct prefix *p) { switch (ip->ipa_type) { case (IPADDR_V4): p->family = AF_INET; p->u.prefix4 = ip->ipaddr_v4; p->prefixlen = prefixlen; break; case (IPADDR_V6): p->family = AF_INET6; p->u.prefix6 = ip->ipaddr_v6; p->prefixlen = prefixlen; break; case (IPADDR_NONE): p->family = AF_UNSPEC; break; } return 0; } /* * Convert type-2 and type-5 evpn route prefixes into the more * general ipv4/ipv6 prefix types so we can match prefix lists * and such. */ int evpn_prefix2prefix(const struct prefix *evpn, struct prefix *to) { const struct evpn_addr *addr; if (evpn->family != AF_EVPN) return -1; addr = &evpn->u.prefix_evpn; switch (addr->route_type) { case BGP_EVPN_MAC_IP_ROUTE: if (IS_IPADDR_V4(&addr->macip_addr.ip)) ipaddr2prefix(&addr->macip_addr.ip, IPV4_MAX_BITLEN, to); else if (IS_IPADDR_V6(&addr->macip_addr.ip)) ipaddr2prefix(&addr->macip_addr.ip, IPV6_MAX_BITLEN, to); else return -1; /* mac only? */ break; case BGP_EVPN_IP_PREFIX_ROUTE: ipaddr2prefix(&addr->prefix_addr.ip, addr->prefix_addr.ip_prefix_length, to); break; default: return -1; } return 0; } printfrr_ext_autoreg_p("EA", printfrr_ea); static ssize_t printfrr_ea(struct fbuf *buf, struct printfrr_eargs *ea, const void *ptr) { const struct ethaddr *mac = ptr; char cbuf[ETHER_ADDR_STRLEN]; if (!mac) return bputs(buf, "(null)"); /* need real length even if buffer is too short */ prefix_mac2str(mac, cbuf, sizeof(cbuf)); return bputs(buf, cbuf); } printfrr_ext_autoreg_p("IA", printfrr_ia); static ssize_t printfrr_ia(struct fbuf *buf, struct printfrr_eargs *ea, const void *ptr) { const struct ipaddr *ipa = ptr; char cbuf[INET6_ADDRSTRLEN]; bool use_star = false; if (ea->fmt[0] == 's') { use_star = true; ea->fmt++; } if (!ipa || !ipa->ipa_type) return bputs(buf, "(null)"); if (use_star) { struct in_addr zero4 = {}; struct in6_addr zero6 = {}; switch (ipa->ipa_type) { case IPADDR_V4: if (!memcmp(&ipa->ip.addr, &zero4, sizeof(zero4))) return bputch(buf, '*'); break; case IPADDR_V6: if (!memcmp(&ipa->ip.addr, &zero6, sizeof(zero6))) return bputch(buf, '*'); break; case IPADDR_NONE: break; } } ipaddr2str(ipa, cbuf, sizeof(cbuf)); return bputs(buf, cbuf); } printfrr_ext_autoreg_p("I4", printfrr_i4); static ssize_t printfrr_i4(struct fbuf *buf, struct printfrr_eargs *ea, const void *ptr) { char cbuf[INET_ADDRSTRLEN]; bool use_star = false; struct in_addr zero = {}; if (ea->fmt[0] == 's') { use_star = true; ea->fmt++; } if (!ptr) return bputs(buf, "(null)"); if (use_star && !memcmp(ptr, &zero, sizeof(zero))) return bputch(buf, '*'); inet_ntop(AF_INET, ptr, cbuf, sizeof(cbuf)); return bputs(buf, cbuf); } printfrr_ext_autoreg_p("I6", printfrr_i6); static ssize_t printfrr_i6(struct fbuf *buf, struct printfrr_eargs *ea, const void *ptr) { char cbuf[INET6_ADDRSTRLEN]; bool use_star = false; struct in6_addr zero = {}; if (ea->fmt[0] == 's') { use_star = true; ea->fmt++; } if (!ptr) return bputs(buf, "(null)"); if (use_star && !memcmp(ptr, &zero, sizeof(zero))) return bputch(buf, '*'); inet_ntop(AF_INET6, ptr, cbuf, sizeof(cbuf)); return bputs(buf, cbuf); } printfrr_ext_autoreg_p("FX", printfrr_pfx); static ssize_t printfrr_pfx(struct fbuf *buf, struct printfrr_eargs *ea, const void *ptr) { bool host_only = false; if (ea->fmt[0] == 'h') { ea->fmt++; host_only = true; } if (!ptr) return bputs(buf, "(null)"); if (host_only) return prefixhost2str(buf, (struct prefix *)ptr); else { char cbuf[PREFIX_STRLEN]; prefix2str(ptr, cbuf, sizeof(cbuf)); return bputs(buf, cbuf); } } printfrr_ext_autoreg_p("PSG4", printfrr_psg); static ssize_t printfrr_psg(struct fbuf *buf, struct printfrr_eargs *ea, const void *ptr) { const struct prefix_sg *sg = ptr; ssize_t ret = 0; if (!sg) return bputs(buf, "(null)"); if (sg->src.s_addr == INADDR_ANY) ret += bputs(buf, "(*,"); else ret += bprintfrr(buf, "(%pI4,", &sg->src); if (sg->grp.s_addr == INADDR_ANY) ret += bputs(buf, "*)"); else ret += bprintfrr(buf, "%pI4)", &sg->grp); return ret; }