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Diffstat (limited to 'src/plugins/nat/nat64_out2in.c')
-rw-r--r--src/plugins/nat/nat64_out2in.c494
1 files changed, 494 insertions, 0 deletions
diff --git a/src/plugins/nat/nat64_out2in.c b/src/plugins/nat/nat64_out2in.c
new file mode 100644
index 00000000000..61e88a7f304
--- /dev/null
+++ b/src/plugins/nat/nat64_out2in.c
@@ -0,0 +1,494 @@
+/*
+ * 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 IPv4 to IPv6 translation (otside to inside network)
+ */
+
+#include <nat/nat64.h>
+#include <vnet/ip/ip4_to_ip6.h>
+#include <vnet/fib/ip4_fib.h>
+
+typedef struct
+{
+ u32 sw_if_index;
+ u32 next_index;
+} nat64_out2in_trace_t;
+
+static u8 *
+format_nat64_out2in_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_out2in_trace_t *t = va_arg (*args, nat64_out2in_trace_t *);
+
+ s =
+ format (s, "NAT64-out2in: sw_if_index %d, next index %d", t->sw_if_index,
+ t->next_index);
+
+ return s;
+}
+
+vlib_node_registration_t nat64_out2in_node;
+
+#define foreach_nat64_out2in_error \
+_(UNSUPPORTED_PROTOCOL, "Unsupported protocol") \
+_(OUT2IN_PACKETS, "Good out2in packets processed") \
+_(NO_TRANSLATION, "No translation") \
+_(UNKNOWN, "unknown")
+
+typedef enum
+{
+#define _(sym,str) NAT64_OUT2IN_ERROR_##sym,
+ foreach_nat64_out2in_error
+#undef _
+ NAT64_OUT2IN_N_ERROR,
+} nat64_out2in_error_t;
+
+static char *nat64_out2in_error_strings[] = {
+#define _(sym,string) string,
+ foreach_nat64_out2in_error
+#undef _
+};
+
+typedef enum
+{
+ NAT64_OUT2IN_NEXT_LOOKUP,
+ NAT64_OUT2IN_NEXT_DROP,
+ NAT64_OUT2IN_N_NEXT,
+} nat64_out2in_next_t;
+
+typedef struct nat64_out2in_set_ctx_t_
+{
+ vlib_buffer_t *b;
+ vlib_main_t *vm;
+} nat64_out2in_set_ctx_t;
+
+static int
+nat64_out2in_tcp_udp_set_cb (ip4_header_t * ip4, ip6_header_t * ip6,
+ void *arg)
+{
+ nat64_main_t *nm = &nat64_main;
+ nat64_out2in_set_ctx_t *ctx = arg;
+ nat64_db_bib_entry_t *bibe;
+ nat64_db_st_entry_t *ste;
+ ip46_address_t saddr, daddr;
+ ip6_address_t ip6_saddr;
+ udp_header_t *udp = ip4_next_header (ip4);
+ tcp_header_t *tcp = ip4_next_header (ip4);
+ u8 proto = ip4->protocol;
+ u16 dport = udp->dst_port;
+ u16 sport = udp->src_port;
+ u32 sw_if_index, fib_index;
+ u16 *checksum;
+ ip_csum_t csum;
+
+ sw_if_index = vnet_buffer (ctx->b)->sw_if_index[VLIB_RX];
+ fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index);
+
+ memset (&saddr, 0, sizeof (saddr));
+ saddr.ip4.as_u32 = ip4->src_address.as_u32;
+ memset (&daddr, 0, sizeof (daddr));
+ daddr.ip4.as_u32 = ip4->dst_address.as_u32;
+
+ ste =
+ nat64_db_st_entry_find (&nm->db, &daddr, &saddr, dport, sport, proto,
+ fib_index, 0);
+ 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, &daddr, dport, proto, fib_index, 0);
+
+ if (!bibe)
+ return -1;
+
+ nat64_compose_ip6 (&ip6_saddr, &ip4->src_address, bibe->fib_index);
+ ste =
+ nat64_db_st_entry_create (&nm->db, bibe, &ip6_saddr, &saddr.ip4,
+ sport);
+ }
+
+ nat64_session_reset_timeout (ste, ctx->vm);
+
+ ip6->src_address.as_u64[0] = ste->in_r_addr.as_u64[0];
+ ip6->src_address.as_u64[1] = ste->in_r_addr.as_u64[1];
+
+ ip6->dst_address.as_u64[0] = bibe->in_addr.as_u64[0];
+ ip6->dst_address.as_u64[1] = bibe->in_addr.as_u64[1];
+ udp->dst_port = bibe->in_port;
+
+ if (proto == IP_PROTOCOL_UDP)
+ checksum = &udp->checksum;
+ else
+ checksum = &tcp->checksum;
+ csum = ip_csum_sub_even (*checksum, dport);
+ csum = ip_csum_add_even (csum, udp->dst_port);
+ *checksum = ip_csum_fold (csum);
+
+ vnet_buffer (ctx->b)->sw_if_index[VLIB_TX] = bibe->fib_index;
+
+ return 0;
+}
+
+static int
+nat64_out2in_icmp_set_cb (ip4_header_t * ip4, ip6_header_t * ip6, void *arg)
+{
+ nat64_main_t *nm = &nat64_main;
+ nat64_out2in_set_ctx_t *ctx = arg;
+ nat64_db_bib_entry_t *bibe;
+ nat64_db_st_entry_t *ste;
+ ip46_address_t saddr, daddr;
+ ip6_address_t ip6_saddr;
+ u32 sw_if_index, fib_index;
+ icmp46_header_t *icmp = ip4_next_header (ip4);
+
+ sw_if_index = vnet_buffer (ctx->b)->sw_if_index[VLIB_RX];
+ fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index);
+
+ memset (&saddr, 0, sizeof (saddr));
+ saddr.ip4.as_u32 = ip4->src_address.as_u32;
+ memset (&daddr, 0, sizeof (daddr));
+ daddr.ip4.as_u32 = ip4->dst_address.as_u32;
+
+ if (icmp->type == ICMP6_echo_request || icmp->type == ICMP6_echo_reply)
+ {
+ u16 out_id = ((u16 *) (icmp))[2];
+ ste =
+ nat64_db_st_entry_find (&nm->db, &daddr, &saddr, out_id, 0,
+ IP_PROTOCOL_ICMP, fib_index, 0);
+
+ if (ste)
+ {
+ bibe =
+ nat64_db_bib_entry_by_index (&nm->db, IP_PROTOCOL_ICMP,
+ ste->bibe_index);
+ if (!bibe)
+ return -1;
+ }
+ else
+ {
+ bibe =
+ nat64_db_bib_entry_find (&nm->db, &daddr, out_id,
+ IP_PROTOCOL_ICMP, fib_index, 0);
+ if (!bibe)
+ return -1;
+
+ nat64_compose_ip6 (&ip6_saddr, &ip4->src_address, bibe->fib_index);
+ ste =
+ nat64_db_st_entry_create (&nm->db, bibe, &ip6_saddr, &saddr.ip4,
+ 0);
+ }
+
+ nat64_session_reset_timeout (ste, ctx->vm);
+
+ ip6->src_address.as_u64[0] = ste->in_r_addr.as_u64[0];
+ ip6->src_address.as_u64[1] = ste->in_r_addr.as_u64[1];
+
+ ip6->dst_address.as_u64[0] = bibe->in_addr.as_u64[0];
+ ip6->dst_address.as_u64[1] = bibe->in_addr.as_u64[1];
+ ((u16 *) (icmp))[2] = bibe->in_port;
+
+ vnet_buffer (ctx->b)->sw_if_index[VLIB_TX] = bibe->fib_index;
+ }
+ else
+ {
+ ip6_header_t *inner_ip6 = (ip6_header_t *) u8_ptr_add (icmp, 8);
+
+ nat64_compose_ip6 (&ip6->src_address, &ip4->src_address,
+ vnet_buffer (ctx->b)->sw_if_index[VLIB_TX]);
+ ip6->dst_address.as_u64[0] = inner_ip6->src_address.as_u64[0];
+ ip6->dst_address.as_u64[1] = inner_ip6->src_address.as_u64[1];
+ }
+
+ return 0;
+}
+
+static int
+nat64_out2in_inner_icmp_set_cb (ip4_header_t * ip4, ip6_header_t * ip6,
+ void *arg)
+{
+ nat64_main_t *nm = &nat64_main;
+ nat64_out2in_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;
+ u8 proto = ip4->protocol;
+
+ 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);
+
+ memset (&saddr, 0, sizeof (saddr));
+ saddr.ip4.as_u32 = ip4->src_address.as_u32;
+ memset (&daddr, 0, sizeof (daddr));
+ daddr.ip4.as_u32 = ip4->dst_address.as_u32;
+
+ if (proto == IP_PROTOCOL_ICMP6)
+ {
+ icmp46_header_t *icmp = ip4_next_header (ip4);
+ u16 out_id = ((u16 *) (icmp))[2];
+ proto = IP_PROTOCOL_ICMP;
+
+ if (!
+ (icmp->type == ICMP6_echo_request
+ || icmp->type == ICMP6_echo_reply))
+ return -1;
+
+ ste =
+ nat64_db_st_entry_find (&nm->db, &saddr, &daddr, out_id, 0, proto,
+ fib_index, 0);
+ if (!ste)
+ return -1;
+
+ bibe = nat64_db_bib_entry_by_index (&nm->db, proto, ste->bibe_index);
+ if (!bibe)
+ return -1;
+
+ ip6->dst_address.as_u64[0] = ste->in_r_addr.as_u64[0];
+ ip6->dst_address.as_u64[1] = ste->in_r_addr.as_u64[1];
+ ip6->src_address.as_u64[0] = bibe->in_addr.as_u64[0];
+ ip6->src_address.as_u64[1] = bibe->in_addr.as_u64[1];
+ ((u16 *) (icmp))[2] = bibe->in_port;
+
+ vnet_buffer (ctx->b)->sw_if_index[VLIB_TX] = bibe->fib_index;
+ }
+ else
+ {
+ udp_header_t *udp = ip4_next_header (ip4);
+ tcp_header_t *tcp = ip4_next_header (ip4);
+ u16 dport = udp->dst_port;
+ u16 sport = udp->src_port;
+ u16 *checksum;
+ ip_csum_t csum;
+
+ ste =
+ nat64_db_st_entry_find (&nm->db, &saddr, &daddr, sport, dport, proto,
+ fib_index, 0);
+ if (!ste)
+ return -1;
+
+ bibe = nat64_db_bib_entry_by_index (&nm->db, proto, ste->bibe_index);
+ if (!bibe)
+ return -1;
+
+ nat64_compose_ip6 (&ip6->dst_address, &daddr.ip4, bibe->fib_index);
+ ip6->src_address.as_u64[0] = bibe->in_addr.as_u64[0];
+ ip6->src_address.as_u64[1] = bibe->in_addr.as_u64[1];
+ udp->src_port = bibe->in_port;
+
+ if (proto == IP_PROTOCOL_UDP)
+ checksum = &udp->checksum;
+ else
+ checksum = &tcp->checksum;
+ if (*checksum)
+ {
+ csum = ip_csum_sub_even (*checksum, sport);
+ csum = ip_csum_add_even (csum, udp->src_port);
+ *checksum = ip_csum_fold (csum);
+ }
+
+ vnet_buffer (ctx->b)->sw_if_index[VLIB_TX] = bibe->fib_index;
+ }
+
+ return 0;
+}
+
+static int
+nat64_out2in_unk_proto_set_cb (ip4_header_t * ip4, ip6_header_t * ip6,
+ void *arg)
+{
+ nat64_main_t *nm = &nat64_main;
+ nat64_out2in_set_ctx_t *ctx = arg;
+ nat64_db_bib_entry_t *bibe;
+ nat64_db_st_entry_t *ste;
+ ip46_address_t saddr, daddr;
+ ip6_address_t ip6_saddr;
+ u32 sw_if_index, fib_index;
+ u8 proto = ip4->protocol;
+
+ sw_if_index = vnet_buffer (ctx->b)->sw_if_index[VLIB_RX];
+ fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index);
+
+ memset (&saddr, 0, sizeof (saddr));
+ saddr.ip4.as_u32 = ip4->src_address.as_u32;
+ memset (&daddr, 0, sizeof (daddr));
+ daddr.ip4.as_u32 = ip4->dst_address.as_u32;
+
+ ste =
+ nat64_db_st_entry_find (&nm->db, &daddr, &saddr, 0, 0, proto, fib_index,
+ 0);
+ 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, &daddr, 0, proto, fib_index, 0);
+
+ if (!bibe)
+ return -1;
+
+ nat64_compose_ip6 (&ip6_saddr, &ip4->src_address, bibe->fib_index);
+ ste =
+ nat64_db_st_entry_create (&nm->db, bibe, &ip6_saddr, &saddr.ip4, 0);
+ }
+
+ nat64_session_reset_timeout (ste, ctx->vm);
+
+ ip6->src_address.as_u64[0] = ste->in_r_addr.as_u64[0];
+ ip6->src_address.as_u64[1] = ste->in_r_addr.as_u64[1];
+
+ ip6->dst_address.as_u64[0] = bibe->in_addr.as_u64[0];
+ ip6->dst_address.as_u64[1] = bibe->in_addr.as_u64[1];
+
+ vnet_buffer (ctx->b)->sw_if_index[VLIB_TX] = bibe->fib_index;
+
+ return 0;
+}
+
+static uword
+nat64_out2in_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ u32 n_left_from, *from, *to_next;
+ nat64_out2in_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;
+ ip4_header_t *ip40;
+ u32 proto0;
+ nat64_out2in_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);
+ ip40 = vlib_buffer_get_current (b0);
+
+ ctx0.b = b0;
+ ctx0.vm = vm;
+
+ next0 = NAT64_OUT2IN_NEXT_LOOKUP;
+
+ proto0 = ip_proto_to_snat_proto (ip40->protocol);
+
+ if (proto0 == SNAT_PROTOCOL_ICMP)
+ {
+ if (icmp_to_icmp6
+ (b0, nat64_out2in_icmp_set_cb, &ctx0,
+ nat64_out2in_inner_icmp_set_cb, &ctx0))
+ {
+ next0 = NAT64_OUT2IN_NEXT_DROP;
+ b0->error = node->errors[NAT64_OUT2IN_ERROR_NO_TRANSLATION];
+ goto trace0;
+ }
+ }
+ else if (proto0 == SNAT_PROTOCOL_TCP || proto0 == SNAT_PROTOCOL_UDP)
+ {
+ if (ip4_to_ip6_tcp_udp (b0, nat64_out2in_tcp_udp_set_cb, &ctx0))
+ {
+ next0 = NAT64_OUT2IN_NEXT_DROP;
+ b0->error = node->errors[NAT64_OUT2IN_ERROR_NO_TRANSLATION];
+ goto trace0;
+ }
+ }
+ else
+ {
+ if (ip4_to_ip6 (b0, nat64_out2in_unk_proto_set_cb, &ctx0))
+ {
+ next0 = NAT64_OUT2IN_NEXT_DROP;
+ b0->error = node->errors[NAT64_OUT2IN_ERROR_NO_TRANSLATION];
+ goto trace0;
+ }
+ }
+
+ trace0:
+ if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
+ && (b0->flags & VLIB_BUFFER_IS_TRACED)))
+ {
+ nat64_out2in_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_OUT2IN_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_out2in_node.index,
+ NAT64_OUT2IN_ERROR_OUT2IN_PACKETS,
+ pkts_processed);
+ return frame->n_vectors;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (nat64_out2in_node) = {
+ .function = nat64_out2in_node_fn,
+ .name = "nat64-out2in",
+ .vector_size = sizeof (u32),
+ .format_trace = format_nat64_out2in_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+ .n_errors = ARRAY_LEN (nat64_out2in_error_strings),
+ .error_strings = nat64_out2in_error_strings,.n_next_nodes = 2,
+ /* edit / add dispositions here */
+ .next_nodes = {
+ [NAT64_OUT2IN_NEXT_DROP] = "error-drop",
+ [NAT64_OUT2IN_NEXT_LOOKUP] = "ip6-lookup",
+ },
+};
+/* *INDENT-ON* */
+
+VLIB_NODE_FUNCTION_MULTIARCH (nat64_out2in_node, nat64_out2in_node_fn);
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */