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authorMatus Fabian <matfabia@cisco.com>2017-06-06 04:53:28 -0700
committerOle Trøan <otroan@employees.org>2017-06-08 11:39:53 +0000
commit06596c54dc51e35222737b01c617cc675505a260 (patch)
tree0ee02baf650e9ab217ee4c3c64913dfac6ce68ff /src/plugins/snat/nat64_in2out.c
parent2fcc49d9c6a66c49148d5790f6af38ab2f3b4be6 (diff)
NAT64: Add NAT64 support for snat plugin (VPP-699)
Basic NAT64 feature (no hairpinning, no multi-thread). Change-Id: I392fccbce93e70c117f4a9a7ec7cf08d6c537f2d Signed-off-by: Matus Fabian <matfabia@cisco.com>
Diffstat (limited to 'src/plugins/snat/nat64_in2out.c')
-rw-r--r--src/plugins/snat/nat64_in2out.c375
1 files changed, 375 insertions, 0 deletions
diff --git a/src/plugins/snat/nat64_in2out.c b/src/plugins/snat/nat64_in2out.c
new file mode 100644
index 00000000000..d9d94a975d1
--- /dev/null
+++ b/src/plugins/snat/nat64_in2out.c
@@ -0,0 +1,375 @@
+/*
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/**
+ * @file
+ * @brief NAT64 IPv6 to IPv4 translation (inside to outside network)
+ */
+
+#include <snat/nat64.h>
+#include <vnet/ip/ip6_to_ip4.h>
+#include <vnet/fib/fib_table.h>
+
+typedef struct
+{
+ u32 sw_if_index;
+ u32 next_index;
+} nat64_in2out_trace_t;
+
+static u8 *
+format_nat64_in2out_trace (u8 * s, va_list * args)
+{
+ CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
+ CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
+ nat64_in2out_trace_t *t = va_arg (*args, nat64_in2out_trace_t *);
+
+ s =
+ format (s, "NAT64-in2out: sw_if_index %d, next index %d", t->sw_if_index,
+ t->next_index);
+
+ return s;
+}
+
+vlib_node_registration_t nat64_in2out_node;
+
+#define foreach_nat64_in2out_error \
+_(UNSUPPORTED_PROTOCOL, "unsupported protocol") \
+_(IN2OUT_PACKETS, "good in2out packets processed") \
+_(NO_TRANSLATION, "no translation") \
+_(UNKNOWN, "unknown")
+
+typedef enum
+{
+#define _(sym,str) NAT64_IN2OUT_ERROR_##sym,
+ foreach_nat64_in2out_error
+#undef _
+ NAT64_IN2OUT_N_ERROR,
+} nat64_in2out_error_t;
+
+static char *nat64_in2out_error_strings[] = {
+#define _(sym,string) string,
+ foreach_nat64_in2out_error
+#undef _
+};
+
+typedef enum
+{
+ NAT64_IN2OUT_NEXT_LOOKUP,
+ NAT64_IN2OUT_NEXT_DROP,
+ NAT64_IN2OUT_N_NEXT,
+} nat64_in2out_next_t;
+
+typedef struct nat64_in2out_set_ctx_t_
+{
+ vlib_buffer_t *b;
+ vlib_main_t *vm;
+} nat64_in2out_set_ctx_t;
+
+static int
+nat64_in2out_tcp_udp_set_cb (ip6_header_t * ip6, ip4_header_t * ip4,
+ void *arg)
+{
+ nat64_main_t *nm = &nat64_main;
+ nat64_in2out_set_ctx_t *ctx = arg;
+ nat64_db_bib_entry_t *bibe;
+ nat64_db_st_entry_t *ste;
+ ip46_address_t saddr, daddr;
+ u32 sw_if_index, fib_index;
+ udp_header_t *udp = ip6_next_header (ip6);
+ snat_protocol_t proto = ip_proto_to_snat_proto (ip6->protocol);
+ u16 sport = udp->src_port;
+ u16 dport = udp->dst_port;
+
+ sw_if_index = vnet_buffer (ctx->b)->sw_if_index[VLIB_RX];
+ fib_index =
+ fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP6, sw_if_index);
+
+ saddr.as_u64[0] = ip6->src_address.as_u64[0];
+ saddr.as_u64[1] = ip6->src_address.as_u64[1];
+ daddr.as_u64[0] = ip6->dst_address.as_u64[0];
+ daddr.as_u64[1] = ip6->dst_address.as_u64[1];
+
+ ste =
+ nat64_db_st_entry_find (&nm->db, &saddr, &daddr, sport, dport, proto,
+ fib_index, 1);
+
+ if (ste)
+ {
+ bibe = nat64_db_bib_entry_by_index (&nm->db, proto, ste->bibe_index);
+ if (!bibe)
+ return -1;
+ }
+ else
+ {
+ bibe =
+ nat64_db_bib_entry_find (&nm->db, &saddr, sport, proto, fib_index, 1);
+
+ if (!bibe)
+ {
+ u16 out_port;
+ ip4_address_t out_addr;
+ if (nat64_alloc_out_addr_and_port
+ (fib_index, proto, &out_addr, &out_port))
+ return -1;
+
+ bibe =
+ nat64_db_bib_entry_create (&nm->db, &ip6->src_address, &out_addr,
+ sport, clib_host_to_net_u16 (out_port),
+ fib_index, proto, 0);
+ if (!bibe)
+ return -1;
+ }
+
+ ste =
+ nat64_db_st_entry_create (&nm->db, bibe, &ip6->dst_address,
+ &daddr.ip4, dport);
+ if (!ste)
+ return -1;
+ }
+
+ nat64_session_reset_timeout (ste, ctx->vm);
+
+ ip4->src_address.as_u32 = bibe->out_addr.as_u32;
+ udp->src_port = bibe->out_port;
+
+ ip4->dst_address.as_u32 = daddr.ip4.as_u32;
+
+ return 0;
+}
+
+static int
+nat64_in2out_icmp_set_cb (ip6_header_t * ip6, ip4_header_t * ip4, void *arg)
+{
+ nat64_main_t *nm = &nat64_main;
+ nat64_in2out_set_ctx_t *ctx = arg;
+ nat64_db_bib_entry_t *bibe;
+ nat64_db_st_entry_t *ste;
+ ip46_address_t saddr, daddr;
+ u32 sw_if_index, fib_index;
+ icmp46_header_t *icmp = ip6_next_header (ip6);
+
+ sw_if_index = vnet_buffer (ctx->b)->sw_if_index[VLIB_RX];
+ fib_index =
+ fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP6, sw_if_index);
+
+ saddr.as_u64[0] = ip6->src_address.as_u64[0];
+ saddr.as_u64[1] = ip6->src_address.as_u64[1];
+ daddr.as_u64[0] = ip6->dst_address.as_u64[0];
+ daddr.as_u64[1] = ip6->dst_address.as_u64[1];
+
+ if (icmp->type == ICMP4_echo_request || icmp->type == ICMP4_echo_reply)
+ {
+ u16 in_id = ((u16 *) (icmp))[2];
+ ste =
+ nat64_db_st_entry_find (&nm->db, &saddr, &daddr, in_id, 0,
+ SNAT_PROTOCOL_ICMP, fib_index, 1);
+
+ if (ste)
+ {
+ bibe =
+ nat64_db_bib_entry_by_index (&nm->db, SNAT_PROTOCOL_ICMP,
+ ste->bibe_index);
+ if (!bibe)
+ return -1;
+ }
+ else
+ {
+ bibe =
+ nat64_db_bib_entry_find (&nm->db, &saddr, in_id,
+ SNAT_PROTOCOL_ICMP, fib_index, 1);
+
+ if (!bibe)
+ {
+ u16 out_id;
+ ip4_address_t out_addr;
+ if (nat64_alloc_out_addr_and_port
+ (fib_index, SNAT_PROTOCOL_ICMP, &out_addr, &out_id))
+ return -1;
+
+ bibe =
+ nat64_db_bib_entry_create (&nm->db, &ip6->src_address,
+ &out_addr, in_id,
+ clib_host_to_net_u16 (out_id),
+ fib_index, SNAT_PROTOCOL_ICMP, 0);
+ if (!bibe)
+ return -1;
+ }
+ ste =
+ nat64_db_st_entry_create (&nm->db, bibe, &ip6->dst_address,
+ &daddr.ip4, 0);
+ if (!ste)
+ return -1;
+ }
+
+ nat64_session_reset_timeout (ste, ctx->vm);
+
+ ip4->src_address.as_u32 = bibe->out_addr.as_u32;
+ ((u16 *) (icmp))[2] = bibe->out_port;
+
+ ip4->dst_address.as_u32 = daddr.ip4.as_u32;
+ }
+ else
+ {
+ //TODO: ICMP error
+ clib_warning ("not ICMP echo request/reply, %u", icmp->type);
+ return -1;
+ }
+
+ return 0;
+}
+
+static int
+nat64_in2out_inner_icmp_set_cb (ip6_header_t * ip6, ip4_header_t * ip4,
+ void *ctx)
+{
+ //TODO:
+ return -1;
+}
+
+static uword
+nat64_in2out_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ u32 n_left_from, *from, *to_next;
+ nat64_in2out_next_t next_index;
+ u32 pkts_processed = 0;
+
+ from = vlib_frame_vector_args (frame);
+ n_left_from = frame->n_vectors;
+ next_index = node->cached_next_index;
+
+ while (n_left_from > 0)
+ {
+ u32 n_left_to_next;
+
+ vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+
+ while (n_left_from > 0 && n_left_to_next > 0)
+ {
+ u32 bi0;
+ vlib_buffer_t *b0;
+ u32 next0;
+ ip6_header_t *ip60;
+ u16 l4_offset0, frag_offset0;
+ u8 l4_protocol0;
+ u32 proto0;
+ nat64_in2out_set_ctx_t ctx0;
+
+ /* speculatively enqueue b0 to the current next frame */
+ bi0 = from[0];
+ to_next[0] = bi0;
+ from += 1;
+ to_next += 1;
+ n_left_from -= 1;
+ n_left_to_next -= 1;
+
+ b0 = vlib_get_buffer (vm, bi0);
+ ip60 = vlib_buffer_get_current (b0);
+
+ ctx0.b = b0;
+ ctx0.vm = vm;
+
+ next0 = NAT64_IN2OUT_NEXT_LOOKUP;
+
+ if (PREDICT_FALSE
+ (ip6_parse
+ (ip60, b0->current_length, &l4_protocol0, &l4_offset0,
+ &frag_offset0)))
+ {
+ next0 = NAT64_IN2OUT_NEXT_DROP;
+ b0->error = node->errors[NAT64_IN2OUT_ERROR_UNKNOWN];
+ goto trace0;
+ }
+
+ proto0 = ip_proto_to_snat_proto (l4_protocol0);
+ if (PREDICT_FALSE ((proto0 == ~0) || (frag_offset0 != 0)))
+ {
+ next0 = NAT64_IN2OUT_NEXT_DROP;
+ b0->error =
+ node->errors[NAT64_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL];
+ goto trace0;
+ }
+
+ if (proto0 == SNAT_PROTOCOL_ICMP)
+ {
+ if (icmp6_to_icmp
+ (b0, nat64_in2out_icmp_set_cb, &ctx0,
+ nat64_in2out_inner_icmp_set_cb, &ctx0))
+ {
+ next0 = NAT64_IN2OUT_NEXT_DROP;
+ b0->error = node->errors[NAT64_IN2OUT_ERROR_NO_TRANSLATION];
+ goto trace0;
+ }
+ }
+ else
+ {
+ if (ip6_to_ip4_tcp_udp
+ (b0, nat64_in2out_tcp_udp_set_cb, &ctx0, 0))
+ {
+ next0 = NAT64_IN2OUT_NEXT_DROP;
+ b0->error = node->errors[NAT64_IN2OUT_ERROR_NO_TRANSLATION];
+ goto trace0;
+ }
+ }
+
+ trace0:
+ if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
+ && (b0->flags & VLIB_BUFFER_IS_TRACED)))
+ {
+ nat64_in2out_trace_t *t =
+ vlib_add_trace (vm, node, b0, sizeof (*t));
+ t->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
+ t->next_index = next0;
+ }
+
+ pkts_processed += next0 != NAT64_IN2OUT_NEXT_DROP;
+
+ /* verify speculative enqueue, maybe switch current next frame */
+ vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
+ n_left_to_next, bi0, next0);
+ }
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ }
+ vlib_node_increment_counter (vm, nat64_in2out_node.index,
+ NAT64_IN2OUT_ERROR_IN2OUT_PACKETS,
+ pkts_processed);
+ return frame->n_vectors;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (nat64_in2out_node) = {
+ .function = nat64_in2out_node_fn,.name = "nat64-in2out",
+ .vector_size = sizeof (u32),
+ .format_trace = format_nat64_in2out_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+ .n_errors = ARRAY_LEN (nat64_in2out_error_strings),
+ .error_strings = nat64_in2out_error_strings,
+ .n_next_nodes = 2,
+ /* edit / add dispositions here */
+ .next_nodes = {
+ [NAT64_IN2OUT_NEXT_DROP] = "error-drop",
+ [NAT64_IN2OUT_NEXT_LOOKUP] = "ip4-lookup",
+ },
+};
+/* *INDENT-ON* */
+
+VLIB_NODE_FUNCTION_MULTIARCH (nat64_in2out_node, nat64_in2out_node_fn);
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */