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08a975926f
bird/lib/net.c
Ondrej Zajicek 161aef353a Lib: Ensure that all net_addr structures have the same alignment 
Also weaken the explicit alignment of net_addr to be u32, as VPN
is already u32-aligned.
2024-12-16 18:56:30 +01:00

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#include "nest/bird.h"
#include "lib/ip.h"
#include "lib/net.h"
#include "lib/flowspec.h"
const char * const net_label[] = {
[NET_IP4] = "ipv4",
[NET_IP6] = "ipv6",
[NET_VPN4] = "vpn4",
[NET_VPN6] = "vpn6",
[NET_ROA4] = "roa4",
[NET_ROA6] = "roa6",
[NET_FLOW4] = "flow4",
[NET_FLOW6] = "flow6",
[NET_IP6_SADR]= "ipv6-sadr",
[NET_MPLS] = "mpls",
[NET_ASPA] = "aspa",
};
const u16 net_addr_length[] = {
[NET_IP4] = sizeof(net_addr_ip4),
[NET_IP6] = sizeof(net_addr_ip6),
[NET_VPN4] = sizeof(net_addr_vpn4),
[NET_VPN6] = sizeof(net_addr_vpn6),
[NET_ROA4] = sizeof(net_addr_roa4),
[NET_ROA6] = sizeof(net_addr_roa6),
[NET_FLOW4] = 0,
[NET_FLOW6] = 0,
[NET_IP6_SADR]= sizeof(net_addr_ip6_sadr),
[NET_MPLS] = sizeof(net_addr_mpls),
[NET_ASPA] = sizeof(net_addr_aspa),
};
const u8 net_max_prefix_length[] = {
[NET_IP4] = IP4_MAX_PREFIX_LENGTH,
[NET_IP6] = IP6_MAX_PREFIX_LENGTH,
[NET_VPN4] = IP4_MAX_PREFIX_LENGTH,
[NET_VPN6] = IP6_MAX_PREFIX_LENGTH,
[NET_ROA4] = IP4_MAX_PREFIX_LENGTH,
[NET_ROA6] = IP6_MAX_PREFIX_LENGTH,
[NET_FLOW4] = IP4_MAX_PREFIX_LENGTH,
[NET_FLOW6] = IP6_MAX_PREFIX_LENGTH,
[NET_IP6_SADR]= IP6_MAX_PREFIX_LENGTH,
[NET_MPLS] = 0,
[NET_ASPA] = 0,
};
const u16 net_max_text_length[] = {
[NET_IP4] = 18, /* "255.255.255.255/32" */
[NET_IP6] = 43, /* "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff/128" */
[NET_VPN4] = 40, /* "4294967296:4294967296 255.255.255.255/32" */
[NET_VPN6] = 65, /* "4294967296:4294967296 ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff/128" */
[NET_ROA4] = 34, /* "255.255.255.255/32-32 AS4294967295" */
[NET_ROA6] = 60, /* "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff/128-128 AS4294967295" */
[NET_FLOW4] = 0, /* "flow4 { ... }" */
[NET_FLOW6] = 0, /* "flow6 { ... }" */
[NET_IP6_SADR]= 92, /* "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff/128 from ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff/128" */
[NET_MPLS] = 7, /* "1048575" */
[NET_ASPA] = 10, /* "4294967295" */
};
/* There should be no implicit padding in net_addr structures */
STATIC_ASSERT(sizeof(net_addr) == 24);
STATIC_ASSERT(sizeof(net_addr_ip4) == 8);
STATIC_ASSERT(sizeof(net_addr_ip6) == 20);
STATIC_ASSERT(sizeof(net_addr_vpn4) == 16);
STATIC_ASSERT(sizeof(net_addr_vpn6) == 32);
STATIC_ASSERT(sizeof(net_addr_roa4) == 16);
STATIC_ASSERT(sizeof(net_addr_roa6) == 28);
STATIC_ASSERT(sizeof(net_addr_flow4) == 8);
STATIC_ASSERT(sizeof(net_addr_flow6) == 20);
STATIC_ASSERT(sizeof(net_addr_ip6_sadr) == 40);
STATIC_ASSERT(sizeof(net_addr_mpls) == 8);
STATIC_ASSERT(sizeof(net_addr_aspa) == 8);
/* Ensure that all net_addr structures have the same alignment */
STATIC_ASSERT(alignof(net_addr_ip4) == alignof(net_addr));
STATIC_ASSERT(alignof(net_addr_ip6) == alignof(net_addr));
STATIC_ASSERT(alignof(net_addr_vpn4) == alignof(net_addr));
STATIC_ASSERT(alignof(net_addr_vpn6) == alignof(net_addr));
STATIC_ASSERT(alignof(net_addr_roa4) == alignof(net_addr));
STATIC_ASSERT(alignof(net_addr_roa6) == alignof(net_addr));
STATIC_ASSERT(alignof(net_addr_flow4) == alignof(net_addr));
STATIC_ASSERT(alignof(net_addr_flow6) == alignof(net_addr));
STATIC_ASSERT(alignof(net_addr_flow4) == alignof(net_addr));
STATIC_ASSERT(alignof(net_addr_flow6) == alignof(net_addr));
STATIC_ASSERT(alignof(net_addr_ip6_sadr) == alignof(net_addr));
STATIC_ASSERT(alignof(net_addr_mpls) == alignof(net_addr));
STATIC_ASSERT(alignof(net_addr_aspa) == alignof(net_addr));
int
rd_format(const vpn_rd rd_, char *buf, int buflen)
{
u64 rd = rd_to_u64(rd_);
switch (rd >> 48)
{
case 0: return bsnprintf(buf, buflen, "%u:%u", (u32) (rd >> 32), (u32) rd);
case 1: return bsnprintf(buf, buflen, "%I4:%u", ip4_from_u32(rd >> 16), (u32) (rd & 0xffff));
case 2: if (((u32) (rd >> 16)) >> 16)
return bsnprintf(buf, buflen, "%u:%u", (u32) (rd >> 16), (u32) (rd & 0xffff));
else
return bsnprintf(buf, buflen, "2:%u:%u", (u32) (rd >> 16), (u32) (rd & 0xffff));
default: return bsnprintf(buf, buflen, "X:%08x:%08x", (u32) (rd >> 32), (u32) rd);
}
}
int
net_format(const net_addr *N, char *buf, int buflen)
{
net_addr_union *n = (void *) N;
buf[0] = 0;
switch (n->n.type)
{
case NET_IP4:
return (buflen < IP4_PX_BUFFER_SIZE) ? -1 : ip4_px_ntop(n->ip4.prefix, n->ip4.pxlen, buf) - buf;
case NET_IP6:
return bsnprintf(buf, buflen, "%I6/%d", n->ip6.prefix, n->ip6.pxlen);
case NET_VPN4:
{
int c = rd_format(n->vpn4.rd, buf, buflen);
ADVANCE(buf, buflen, c);
return bsnprintf(buf, buflen, " %I4/%d", n->vpn4.prefix, n->vpn4.pxlen);
}
case NET_VPN6:
{
/* XXX: RD format is specified for VPN4; not found any for VPN6, reusing the same as for VPN4 */
int c = rd_format(n->vpn6.rd, buf, buflen);
ADVANCE(buf, buflen, c);
return bsnprintf(buf, buflen, " %I6/%d", n->vpn6.prefix, n->vpn6.pxlen);
}
case NET_ROA4:
return bsnprintf(buf, buflen, "%I4/%u-%u AS%u", n->roa4.prefix, n->roa4.pxlen, n->roa4.max_pxlen, n->roa4.asn);
case NET_ROA6:
return bsnprintf(buf, buflen, "%I6/%u-%u AS%u", n->roa6.prefix, n->roa6.pxlen, n->roa6.max_pxlen, n->roa6.asn);
case NET_FLOW4:
return flow4_net_format(buf, buflen, &n->flow4);
case NET_FLOW6:
return flow6_net_format(buf, buflen, &n->flow6);
case NET_IP6_SADR:
return bsnprintf(buf, buflen, "%I6/%d from %I6/%d", n->ip6_sadr.dst_prefix, n->ip6_sadr.dst_pxlen, n->ip6_sadr.src_prefix, n->ip6_sadr.src_pxlen);
case NET_MPLS:
return bsnprintf(buf, buflen, "%u", n->mpls.label);
case NET_ASPA:
return bsnprintf(buf, buflen, "%u", n->aspa.asn);
}
bug("unknown network type");
}
ip_addr
net_pxmask(const net_addr *a)
{
switch (a->type)
{
case NET_IP4:
case NET_VPN4:
case NET_ROA4:
case NET_FLOW4:
return ipa_from_ip4(ip4_mkmask(net4_pxlen(a)));
case NET_IP6:
case NET_VPN6:
case NET_ROA6:
case NET_FLOW6:
case NET_IP6_SADR:
return ipa_from_ip6(ip6_mkmask(net6_pxlen(a)));
case NET_MPLS:
case NET_ASPA:
default:
return IPA_NONE;
}
}
int
net_compare(const net_addr *a, const net_addr *b)
{
if (a->type != b->type)
return uint_cmp(a->type, b->type);
switch (a->type)
{
case NET_IP4:
return net_compare_ip4((const net_addr_ip4 *) a, (const net_addr_ip4 *) b);
case NET_IP6:
return net_compare_ip6((const net_addr_ip6 *) a, (const net_addr_ip6 *) b);
case NET_VPN4:
return net_compare_vpn4((const net_addr_vpn4 *) a, (const net_addr_vpn4 *) b);
case NET_VPN6:
return net_compare_vpn6((const net_addr_vpn6 *) a, (const net_addr_vpn6 *) b);
case NET_ROA4:
return net_compare_roa4((const net_addr_roa4 *) a, (const net_addr_roa4 *) b);
case NET_ROA6:
return net_compare_roa6((const net_addr_roa6 *) a, (const net_addr_roa6 *) b);
case NET_FLOW4:
return net_compare_flow4((const net_addr_flow4 *) a, (const net_addr_flow4 *) b);
case NET_FLOW6:
return net_compare_flow6((const net_addr_flow6 *) a, (const net_addr_flow6 *) b);
case NET_IP6_SADR:
return net_compare_ip6_sadr((const net_addr_ip6_sadr *) a, (const net_addr_ip6_sadr *) b);
case NET_MPLS:
return net_compare_mpls((const net_addr_mpls *) a, (const net_addr_mpls *) b);
case NET_ASPA:
return net_compare_aspa((const net_addr_aspa *) a, (const net_addr_aspa *) b);
}
return 0;
}
#define NET_HASH(a,t) net_hash_##t((const net_addr_##t *) a)
u32
net_hash(const net_addr *n)
{
switch (n->type)
{
case NET_IP4: return NET_HASH(n, ip4);
case NET_IP6: return NET_HASH(n, ip6);
case NET_VPN4: return NET_HASH(n, vpn4);
case NET_VPN6: return NET_HASH(n, vpn6);
case NET_ROA4: return NET_HASH(n, roa4);
case NET_ROA6: return NET_HASH(n, roa6);
case NET_FLOW4: return NET_HASH(n, flow4);
case NET_FLOW6: return NET_HASH(n, flow6);
case NET_IP6_SADR: return NET_HASH(n, ip6_sadr);
case NET_MPLS: return NET_HASH(n, mpls);
case NET_ASPA: return NET_HASH(n, aspa);
default: bug("invalid type");
}
}
#define NET_VALIDATE(a,t) net_validate_##t((const net_addr_##t *) a)
int
net_validate(const net_addr *n)
{
switch (n->type)
{
case NET_IP4: return NET_VALIDATE(n, ip4);
case NET_IP6: return NET_VALIDATE(n, ip6);
case NET_VPN4: return NET_VALIDATE(n, vpn4);
case NET_VPN6: return NET_VALIDATE(n, vpn6);
case NET_ROA4: return NET_VALIDATE(n, roa4);
case NET_ROA6: return NET_VALIDATE(n, roa6);
case NET_FLOW4: return NET_VALIDATE(n, flow4);
case NET_FLOW6: return NET_VALIDATE(n, flow6);
case NET_IP6_SADR: return NET_VALIDATE(n, ip6_sadr);
case NET_MPLS: return NET_VALIDATE(n, mpls);
case NET_ASPA: return NET_VALIDATE(n, aspa);
default: return 0;
}
}
void
net_normalize(net_addr *N)
{
net_addr_union *n = (void *) N;
switch (n->n.type)
{
case NET_IP4:
case NET_VPN4:
case NET_ROA4:
case NET_FLOW4:
return net_normalize_ip4(&n->ip4);
case NET_IP6:
case NET_VPN6:
case NET_ROA6:
case NET_FLOW6:
return net_normalize_ip6(&n->ip6);
case NET_IP6_SADR:
return net_normalize_ip6_sadr(&n->ip6_sadr);
case NET_MPLS:
case NET_ASPA:
return;
}
}
int
net_classify(const net_addr *N)
{
net_addr_union *n = (void *) N;
switch (n->n.type)
{
case NET_IP4:
case NET_VPN4:
case NET_ROA4:
case NET_FLOW4:
return ip4_zero(n->ip4.prefix) ? (IADDR_HOST | SCOPE_UNIVERSE) : ip4_classify(n->ip4.prefix);
case NET_IP6:
case NET_VPN6:
case NET_ROA6:
case NET_FLOW6:
return ip6_zero(n->ip6.prefix) ? (IADDR_HOST | SCOPE_UNIVERSE) : ip6_classify(&n->ip6.prefix);
case NET_IP6_SADR:
return ip6_zero(n->ip6_sadr.dst_prefix) ? (IADDR_HOST | SCOPE_UNIVERSE) : ip6_classify(&n->ip6_sadr.dst_prefix);
case NET_MPLS:
case NET_ASPA:
return IADDR_HOST | SCOPE_UNIVERSE;
}
return IADDR_INVALID;
}
int
ipa_in_netX(const ip_addr a, const net_addr *n)
{
switch (n->type)
{
case NET_IP4:
case NET_VPN4:
case NET_ROA4:
case NET_FLOW4:
if (!ipa_is_ip4(a)) return 0;
return ip4_zero(ip4_and(ip4_xor(ipa_to_ip4(a), net4_prefix(n)),
ip4_mkmask(net4_pxlen(n))));
case NET_IP6:
case NET_VPN6:
case NET_ROA6:
case NET_FLOW6:
if (ipa_is_ip4(a)) return 0;
return ip6_zero(ip6_and(ip6_xor(ipa_to_ip6(a), net6_prefix(n)),
ip6_mkmask(net6_pxlen(n))));
case NET_IP6_SADR:
if (ipa_is_ip4(a)) return 0;
return ip6_zero(ip6_and(ip6_xor(ipa_to_ip6(a), net6_prefix(n)),
ip6_mkmask(net6_pxlen(n))));
case NET_MPLS:
case NET_ASPA:
default:
return 0;
}
}
int
net_in_netX(const net_addr *a, const net_addr *n)
{
if (a->type != n->type)
return 0;
return (net_pxlen(n) <= net_pxlen(a)) && ipa_in_netX(net_prefix(a), n);
}
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