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-rw-r--r--lib/net.c308
1 files changed, 308 insertions, 0 deletions
diff --git a/lib/net.c b/lib/net.c
new file mode 100644
index 00000000..9335b78f
--- /dev/null
+++ b/lib/net.c
@@ -0,0 +1,308 @@
+
+#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_MPLS] = "mpls",
+};
+
+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_MPLS] = sizeof(net_addr_mpls),
+};
+
+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_MPLS] = 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_MPLS] = 7, /* "1048575" */
+};
+
+
+int
+rd_format(const u64 rd, char *buf, int buflen)
+{
+ 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 bsnprintf(buf, buflen, "%I4/%d", n->ip4.prefix, n->ip4.pxlen);
+ 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_MPLS:
+ return bsnprintf(buf, buflen, "%u", n->mpls.label);
+ }
+
+ 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:
+ return ipa_from_ip6(ip6_mkmask(net6_pxlen(a)));
+
+ case NET_MPLS:
+ 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_MPLS:
+ return net_compare_mpls((const net_addr_mpls *) a, (const net_addr_mpls *) 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_MPLS: return NET_HASH(n, mpls);
+ 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_MPLS: return NET_VALIDATE(n, mpls);
+ 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_MPLS:
+ 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_MPLS:
+ 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_MPLS:
+ 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);
+}
+
+#define CHECK_NET(T,S) \
+ ({ if (sizeof(T) != S) die("sizeof %s is %d/%d", #T, (int) sizeof(T), S); })
+
+void
+net_init(void)
+{
+ CHECK_NET(net_addr, 24);
+ CHECK_NET(net_addr_ip4, 8);
+ CHECK_NET(net_addr_ip6, 20);
+ CHECK_NET(net_addr_vpn4, 16);
+ CHECK_NET(net_addr_vpn6, 32);
+ CHECK_NET(net_addr_roa4, 16);
+ CHECK_NET(net_addr_roa6, 28);
+ CHECK_NET(net_addr_flow4, 8);
+ CHECK_NET(net_addr_flow6, 20);
+ CHECK_NET(net_addr_mpls, 8);
+}
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