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|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Prefix related functions.
* Copyright (C) 1997, 98, 99 Kunihiro Ishiguro
*/
#include <zebra.h>
#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.addr;
/* 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);
}
}
/*
* 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 (!memcmp(&p1->u.prefix_evpn, &p2->u.prefix_evpn,
sizeof(struct evpn_addr)))
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("<src?>", sg->src, src_str, sizeof(src_str));
prefix_mcast_inet4_dump("<grp?>", 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;
}
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