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authorMatus Fabian <matfabia@cisco.com>2017-06-21 06:15:18 -0700
committerOle Trøan <otroan@employees.org>2017-06-21 16:27:41 +0000
commit428dc9110bee7eedf8aac6f12a89181e8e5343f5 (patch)
treea24e6acb6db074054286f18dd11ac96df96c2832 /src/plugins/snat/nat64.c
parent793fe2179c2403af330409f7e7d34bb0f7910b99 (diff)
NAT64: custom prefix
Change-Id: If397b49861468eed29b964fa64b186f80eb0eceb Signed-off-by: Matus Fabian <matfabia@cisco.com>
Diffstat (limited to 'src/plugins/snat/nat64.c')
-rw-r--r--src/plugins/snat/nat64.c210
1 files changed, 210 insertions, 0 deletions
diff --git a/src/plugins/snat/nat64.c b/src/plugins/snat/nat64.c
index d6e052f106d..d7772a74d36 100644
--- a/src/plugins/snat/nat64.c
+++ b/src/plugins/snat/nat64.c
@@ -38,6 +38,13 @@ VNET_FEATURE_INIT (nat64_out2in, static) = {
.runs_before = VNET_FEATURES ("ip4-lookup"),
};
+static u8 well_known_prefix[] = {
+ 0x00, 0x64, 0xff, 0x9b,
+ 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00
+};
+
/* *INDENT-ON* */
clib_error_t *
@@ -600,6 +607,209 @@ nat64_tcp_session_set_state (nat64_db_st_entry_t * ste, tcp_header_t * tcp,
}
}
+int
+nat64_add_del_prefix (ip6_address_t * prefix, u8 plen, u32 vrf_id, u8 is_add)
+{
+ nat64_main_t *nm = &nat64_main;
+ nat64_prefix_t *p = 0;
+ int i;
+
+ /* Verify prefix length */
+ if (plen != 32 && plen != 40 && plen != 48 && plen != 56 && plen != 64
+ && plen != 96)
+ return VNET_API_ERROR_INVALID_VALUE;
+
+ /* Check if tenant already have prefix */
+ for (i = 0; i < vec_len (nm->pref64); i++)
+ {
+ if (nm->pref64[i].vrf_id == vrf_id)
+ {
+ p = nm->pref64 + i;
+ break;
+ }
+ }
+
+ if (is_add)
+ {
+ if (!p)
+ {
+ vec_add2 (nm->pref64, p, 1);
+ p->fib_index =
+ fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, vrf_id);
+ p->vrf_id = vrf_id;
+ }
+
+ p->prefix.as_u64[0] = prefix->as_u64[0];
+ p->prefix.as_u64[1] = prefix->as_u64[1];
+ p->plen = plen;
+ }
+ else
+ {
+ if (!p)
+ return VNET_API_ERROR_NO_SUCH_ENTRY;
+
+ vec_del1 (nm->pref64, i);
+ }
+
+ return 0;
+}
+
+void
+nat64_prefix_walk (nat64_prefix_walk_fn_t fn, void *ctx)
+{
+ nat64_main_t *nm = &nat64_main;
+ nat64_prefix_t *p = 0;
+
+ /* *INDENT-OFF* */
+ vec_foreach (p, nm->pref64)
+ {
+ if (fn (p, ctx))
+ break;
+ };
+ /* *INDENT-ON* */
+}
+
+void
+nat64_compose_ip6 (ip6_address_t * ip6, ip4_address_t * ip4, u32 fib_index)
+{
+ nat64_main_t *nm = &nat64_main;
+ nat64_prefix_t *p, *gp = 0, *prefix = 0;
+
+ /* *INDENT-OFF* */
+ vec_foreach (p, nm->pref64)
+ {
+ if (p->fib_index == fib_index)
+ {
+ prefix = p;
+ break;
+ }
+
+ if (p->fib_index == 0)
+ gp = p;
+ };
+ /* *INDENT-ON* */
+
+ if (!prefix)
+ prefix = gp;
+
+ if (prefix)
+ {
+ memset (ip6, 0, 16);
+ memcpy (ip6, &p->prefix, p->plen);
+ switch (p->plen)
+ {
+ case 32:
+ ip6->as_u32[1] = ip4->as_u32;
+ break;
+ case 40:
+ ip6->as_u8[5] = ip4->as_u8[0];
+ ip6->as_u8[6] = ip4->as_u8[1];
+ ip6->as_u8[7] = ip4->as_u8[2];
+ ip6->as_u8[9] = ip4->as_u8[3];
+ break;
+ case 48:
+ ip6->as_u8[6] = ip4->as_u8[0];
+ ip6->as_u8[7] = ip4->as_u8[1];
+ ip6->as_u8[9] = ip4->as_u8[2];
+ ip6->as_u8[10] = ip4->as_u8[3];
+ break;
+ case 56:
+ ip6->as_u8[7] = ip4->as_u8[0];
+ ip6->as_u8[9] = ip4->as_u8[1];
+ ip6->as_u8[10] = ip4->as_u8[2];
+ ip6->as_u8[11] = ip4->as_u8[3];
+ break;
+ case 64:
+ ip6->as_u8[9] = ip4->as_u8[0];
+ ip6->as_u8[10] = ip4->as_u8[1];
+ ip6->as_u8[11] = ip4->as_u8[2];
+ ip6->as_u8[12] = ip4->as_u8[3];
+ break;
+ case 96:
+ ip6->as_u32[3] = ip4->as_u32;
+ break;
+ default:
+ clib_warning ("invalid prefix length");
+ break;
+ }
+ }
+ else
+ {
+ memcpy (ip6, well_known_prefix, 16);
+ ip6->as_u32[3] = ip4->as_u32;
+ }
+}
+
+void
+nat64_extract_ip4 (ip6_address_t * ip6, ip4_address_t * ip4, u32 fib_index)
+{
+ nat64_main_t *nm = &nat64_main;
+ nat64_prefix_t *p, *gp = 0;
+ u8 plen = 0;
+
+ /* *INDENT-OFF* */
+ vec_foreach (p, nm->pref64)
+ {
+ if (p->fib_index == fib_index)
+ {
+ plen = p->plen;
+ break;
+ }
+
+ if (p->vrf_id == 0)
+ gp = p;
+ };
+ /* *INDENT-ON* */
+
+ if (!plen)
+ {
+ if (gp)
+ plen = gp->plen;
+ else
+ plen = 96;
+ }
+
+ switch (plen)
+ {
+ case 32:
+ ip4->as_u32 = ip6->as_u32[1];
+ break;
+ case 40:
+ ip4->as_u8[0] = ip6->as_u8[5];
+ ip4->as_u8[1] = ip6->as_u8[6];
+ ip4->as_u8[2] = ip6->as_u8[7];
+ ip4->as_u8[3] = ip6->as_u8[9];
+ break;
+ case 48:
+ ip4->as_u8[0] = ip6->as_u8[6];
+ ip4->as_u8[1] = ip6->as_u8[7];
+ ip4->as_u8[2] = ip6->as_u8[9];
+ ip4->as_u8[3] = ip6->as_u8[10];
+ break;
+ case 56:
+ ip4->as_u8[0] = ip6->as_u8[7];
+ ip4->as_u8[1] = ip6->as_u8[9];
+ ip4->as_u8[2] = ip6->as_u8[10];
+ ip4->as_u8[3] = ip6->as_u8[11];
+ break;
+ case 64:
+ ip4->as_u8[0] = ip6->as_u8[9];
+ ip4->as_u8[1] = ip6->as_u8[10];
+ ip4->as_u8[2] = ip6->as_u8[11];
+ ip4->as_u8[3] = ip6->as_u8[12];
+ break;
+ case 96:
+ ip4->as_u32 = ip6->as_u32[3];
+ break;
+ default:
+ clib_warning ("invalid prefix length");
+ break;
+ }
+
+ clib_warning ("%U %U plen %u", format_ip6_address, ip6, format_ip4_address,
+ ip4, plen);
+}
+
/**
* @brief The 'nat64-expire-walk' process's main loop.
*