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Diffstat (limited to 'src/plugins/nat/nat44-ei/nat44_ei_out2in.c')
-rw-r--r--src/plugins/nat/nat44-ei/nat44_ei_out2in.c1580
1 files changed, 1580 insertions, 0 deletions
diff --git a/src/plugins/nat/nat44-ei/nat44_ei_out2in.c b/src/plugins/nat/nat44-ei/nat44_ei_out2in.c
new file mode 100644
index 00000000000..8220f0dc9d8
--- /dev/null
+++ b/src/plugins/nat/nat44-ei/nat44_ei_out2in.c
@@ -0,0 +1,1580 @@
+/*
+ * Copyright (c) 2016 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 NAT44 endpoint-dependent outside to inside network translation
+ */
+
+#include <vlib/vlib.h>
+#include <vnet/vnet.h>
+
+#include <vnet/ip/ip.h>
+#include <vnet/udp/udp_local.h>
+#include <vnet/ethernet/ethernet.h>
+#include <vnet/fib/ip4_fib.h>
+#include <nat/nat.h>
+#include <nat/lib/ipfix_logging.h>
+#include <nat/nat_inlines.h>
+#include <nat/lib/nat_syslog.h>
+#include <nat/nat44-ei/nat44_ei_inlines.h>
+
+#include <vppinfra/hash.h>
+#include <vppinfra/error.h>
+#include <vppinfra/elog.h>
+
+typedef struct
+{
+ u32 sw_if_index;
+ u32 next_index;
+ u32 session_index;
+} snat_out2in_trace_t;
+
+/* packet trace format function */
+static u8 *
+format_snat_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 *);
+ snat_out2in_trace_t *t = va_arg (*args, snat_out2in_trace_t *);
+
+ s =
+ format (s,
+ "NAT44_OUT2IN: sw_if_index %d, next index %d, session index %d",
+ t->sw_if_index, t->next_index, t->session_index);
+ return s;
+}
+
+static u8 *
+format_snat_out2in_fast_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 *);
+ snat_out2in_trace_t *t = va_arg (*args, snat_out2in_trace_t *);
+
+ s = format (s, "NAT44_OUT2IN_FAST: sw_if_index %d, next index %d",
+ t->sw_if_index, t->next_index);
+ return s;
+}
+
+#define foreach_snat_out2in_error \
+_(UNSUPPORTED_PROTOCOL, "unsupported protocol") \
+_(OUT_OF_PORTS, "out of ports") \
+_(BAD_ICMP_TYPE, "unsupported ICMP type") \
+_(NO_TRANSLATION, "no translation") \
+_(MAX_SESSIONS_EXCEEDED, "maximum sessions exceeded") \
+_(CANNOT_CREATE_USER, "cannot create NAT user")
+
+typedef enum
+{
+#define _(sym,str) SNAT_OUT2IN_ERROR_##sym,
+ foreach_snat_out2in_error
+#undef _
+ SNAT_OUT2IN_N_ERROR,
+} snat_out2in_error_t;
+
+static char *snat_out2in_error_strings[] = {
+#define _(sym,string) string,
+ foreach_snat_out2in_error
+#undef _
+};
+
+typedef enum
+{
+ SNAT_OUT2IN_NEXT_DROP,
+ SNAT_OUT2IN_NEXT_LOOKUP,
+ SNAT_OUT2IN_NEXT_ICMP_ERROR,
+ SNAT_OUT2IN_N_NEXT,
+} snat_out2in_next_t;
+
+#ifndef CLIB_MARCH_VARIANT
+int
+nat44_o2i_is_idle_session_cb (clib_bihash_kv_8_8_t * kv, void *arg)
+{
+ snat_main_t *sm = &snat_main;
+ nat44_is_idle_session_ctx_t *ctx = arg;
+ snat_session_t *s;
+ u64 sess_timeout_time;
+ snat_main_per_thread_data_t *tsm = vec_elt_at_index (sm->per_thread_data,
+ ctx->thread_index);
+ clib_bihash_kv_8_8_t s_kv;
+
+ s = pool_elt_at_index (tsm->sessions, kv->value);
+ sess_timeout_time = s->last_heard + (f64) nat44_session_get_timeout (sm, s);
+ if (ctx->now >= sess_timeout_time)
+ {
+ init_nat_i2o_k (&s_kv, s);
+ if (clib_bihash_add_del_8_8 (&tsm->in2out, &s_kv, 0))
+ nat_elog_warn ("out2in key del failed");
+
+ nat_ipfix_logging_nat44_ses_delete (ctx->thread_index,
+ s->in2out.addr.as_u32,
+ s->out2in.addr.as_u32,
+ s->nat_proto,
+ s->in2out.port,
+ s->out2in.port,
+ s->in2out.fib_index);
+
+ nat_syslog_nat44_apmdel (s->user_index, s->in2out.fib_index,
+ &s->in2out.addr, s->in2out.port,
+ &s->out2in.addr, s->out2in.port, s->nat_proto);
+
+ nat_ha_sdel (&s->out2in.addr, s->out2in.port, &s->ext_host_addr,
+ s->ext_host_port, s->nat_proto, s->out2in.fib_index,
+ ctx->thread_index);
+
+ if (!snat_is_session_static (s))
+ snat_free_outside_address_and_port (sm->addresses, ctx->thread_index,
+ &s->out2in.addr, s->out2in.port,
+ s->nat_proto);
+
+ nat44_delete_session (sm, s, ctx->thread_index);
+ return 1;
+ }
+
+ return 0;
+}
+#endif
+
+/**
+ * @brief Create session for static mapping.
+ *
+ * Create NAT session initiated by host from external network with static
+ * mapping.
+ *
+ * @param sm NAT main.
+ * @param b0 Vlib buffer.
+ * @param in2out In2out NAT44 session key.
+ * @param out2in Out2in NAT44 session key.
+ * @param node Vlib node.
+ *
+ * @returns SNAT session if successfully created otherwise 0.
+ */
+static inline snat_session_t *
+create_session_for_static_mapping (snat_main_t * sm,
+ vlib_buffer_t * b0,
+ ip4_address_t i2o_addr,
+ u16 i2o_port,
+ u32 i2o_fib_index,
+ ip4_address_t o2i_addr,
+ u16 o2i_port,
+ u32 o2i_fib_index,
+ nat_protocol_t proto,
+ vlib_node_runtime_t * node,
+ u32 thread_index, f64 now)
+{
+ snat_user_t *u;
+ snat_session_t *s;
+ clib_bihash_kv_8_8_t kv0;
+ ip4_header_t *ip0;
+ udp_header_t *udp0;
+ nat44_is_idle_session_ctx_t ctx0;
+
+ if (PREDICT_FALSE (nat44_ei_maximum_sessions_exceeded (sm, thread_index)))
+ {
+ b0->error = node->errors[SNAT_OUT2IN_ERROR_MAX_SESSIONS_EXCEEDED];
+ nat_elog_notice ("maximum sessions exceeded");
+ return 0;
+ }
+
+ ip0 = vlib_buffer_get_current (b0);
+ udp0 = ip4_next_header (ip0);
+
+ u = nat_user_get_or_create (sm, &i2o_addr, i2o_fib_index, thread_index);
+ if (!u)
+ {
+ b0->error = node->errors[SNAT_OUT2IN_ERROR_CANNOT_CREATE_USER];
+ return 0;
+ }
+
+ s = nat_session_alloc_or_recycle (sm, u, thread_index, now);
+ if (!s)
+ {
+ nat44_delete_user_with_no_session (sm, u, thread_index);
+ nat_elog_warn ("create NAT session failed");
+ return 0;
+ }
+
+ s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
+ s->ext_host_addr.as_u32 = ip0->src_address.as_u32;
+ s->ext_host_port = udp0->src_port;
+ user_session_increment (sm, u, 1 /* static */ );
+ s->in2out.addr = i2o_addr;
+ s->in2out.port = i2o_port;
+ s->in2out.fib_index = i2o_fib_index;
+ s->out2in.addr = o2i_addr;
+ s->out2in.port = o2i_port;
+ s->out2in.fib_index = o2i_fib_index;
+ s->nat_proto = proto;
+
+ /* Add to translation hashes */
+ ctx0.now = now;
+ ctx0.thread_index = thread_index;
+ init_nat_i2o_kv (&kv0, s, s - sm->per_thread_data[thread_index].sessions);
+ if (clib_bihash_add_or_overwrite_stale_8_8
+ (&sm->per_thread_data[thread_index].in2out, &kv0,
+ nat44_i2o_is_idle_session_cb, &ctx0))
+ nat_elog_notice ("in2out key add failed");
+
+ init_nat_o2i_kv (&kv0, s, s - sm->per_thread_data[thread_index].sessions);
+ if (clib_bihash_add_or_overwrite_stale_8_8
+ (&sm->per_thread_data[thread_index].out2in, &kv0,
+ nat44_o2i_is_idle_session_cb, &ctx0))
+ nat_elog_notice ("out2in key add failed");
+
+ /* log NAT event */
+ nat_ipfix_logging_nat44_ses_create (thread_index,
+ s->in2out.addr.as_u32,
+ s->out2in.addr.as_u32,
+ s->nat_proto,
+ s->in2out.port,
+ s->out2in.port, s->in2out.fib_index);
+
+ nat_syslog_nat44_apmadd (s->user_index, s->in2out.fib_index,
+ &s->in2out.addr, s->in2out.port, &s->out2in.addr,
+ s->out2in.port, s->nat_proto);
+
+ nat_ha_sadd (&s->in2out.addr, s->in2out.port, &s->out2in.addr,
+ s->out2in.port, &s->ext_host_addr, s->ext_host_port,
+ &s->ext_host_nat_addr, s->ext_host_nat_port,
+ s->nat_proto, s->in2out.fib_index, s->flags, thread_index, 0);
+
+ return s;
+}
+
+#ifndef CLIB_MARCH_VARIANT
+static_always_inline snat_out2in_error_t
+icmp_get_key (vlib_buffer_t * b, ip4_header_t * ip0,
+ ip4_address_t * addr, u16 * port, nat_protocol_t * nat_proto)
+{
+ icmp46_header_t *icmp0;
+ icmp_echo_header_t *echo0, *inner_echo0 = 0;
+ ip4_header_t *inner_ip0;
+ void *l4_header = 0;
+ icmp46_header_t *inner_icmp0;
+
+ icmp0 = (icmp46_header_t *) ip4_next_header (ip0);
+ echo0 = (icmp_echo_header_t *) (icmp0 + 1);
+
+ if (!icmp_type_is_error_message
+ (vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags))
+ {
+ *nat_proto = NAT_PROTOCOL_ICMP;
+ *addr = ip0->dst_address;
+ *port = vnet_buffer (b)->ip.reass.l4_src_port;
+ }
+ else
+ {
+ inner_ip0 = (ip4_header_t *) (echo0 + 1);
+ l4_header = ip4_next_header (inner_ip0);
+ *nat_proto = ip_proto_to_nat_proto (inner_ip0->protocol);
+ *addr = inner_ip0->src_address;
+ switch (*nat_proto)
+ {
+ case NAT_PROTOCOL_ICMP:
+ inner_icmp0 = (icmp46_header_t *) l4_header;
+ inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1);
+ *port = inner_echo0->identifier;
+ break;
+ case NAT_PROTOCOL_UDP:
+ case NAT_PROTOCOL_TCP:
+ *port = ((tcp_udp_header_t *) l4_header)->src_port;
+ break;
+ default:
+ return SNAT_OUT2IN_ERROR_UNSUPPORTED_PROTOCOL;
+ }
+ }
+ return -1; /* success */
+}
+
+/**
+ * Get address and port values to be used for ICMP packet translation
+ * and create session if needed
+ *
+ * @param[in,out] sm NAT main
+ * @param[in,out] node NAT node runtime
+ * @param[in] thread_index thread index
+ * @param[in,out] b0 buffer containing packet to be translated
+ * @param[in,out] ip0 ip header
+ * @param[out] p_proto protocol used for matching
+ * @param[out] p_value address and port after NAT translation
+ * @param[out] p_dont_translate if packet should not be translated
+ * @param d optional parameter
+ * @param e optional parameter
+ */
+u32
+icmp_match_out2in_slow (snat_main_t * sm, vlib_node_runtime_t * node,
+ u32 thread_index, vlib_buffer_t * b0,
+ ip4_header_t * ip0, ip4_address_t * addr,
+ u16 * port, u32 * fib_index,
+ nat_protocol_t * proto, void *d, void *e,
+ u8 * dont_translate)
+{
+ snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
+ u32 sw_if_index0;
+ snat_session_t *s0 = 0;
+ clib_bihash_kv_8_8_t kv0, value0;
+ u8 is_addr_only;
+ u32 next0 = ~0;
+ int err;
+ u8 identity_nat;
+ vlib_main_t *vm = vlib_get_main ();
+ *dont_translate = 0;
+
+ sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
+ *fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
+
+ *proto = 0;
+
+ err = icmp_get_key (b0, ip0, addr, port, proto);
+ if (err != -1)
+ {
+ b0->error = node->errors[SNAT_OUT2IN_ERROR_UNSUPPORTED_PROTOCOL];
+ next0 = SNAT_OUT2IN_NEXT_DROP;
+ goto out;
+ }
+
+ ip4_address_t mapping_addr;
+ u16 mapping_port;
+ u32 mapping_fib_index;
+
+ init_nat_k (&kv0, *addr, *port, *fib_index, *proto);
+ if (clib_bihash_search_8_8 (&tsm->out2in, &kv0, &value0))
+ {
+ /* Try to match static mapping by external address and port,
+ destination address and port in packet */
+ if (snat_static_mapping_match
+ (sm, *addr, *port, *fib_index, *proto,
+ &mapping_addr, &mapping_port, &mapping_fib_index, 1, &is_addr_only,
+ 0, 0, 0, &identity_nat, 0))
+ {
+ if (!sm->forwarding_enabled)
+ {
+ /* Don't NAT packet aimed at the intfc address */
+ if (PREDICT_FALSE (is_interface_addr (sm, node, sw_if_index0,
+ ip0->dst_address.as_u32)))
+ {
+ *dont_translate = 1;
+ goto out;
+ }
+ b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
+ next0 = SNAT_OUT2IN_NEXT_DROP;
+ goto out;
+ }
+ else
+ {
+ *dont_translate = 1;
+ goto out;
+ }
+ }
+
+ if (PREDICT_FALSE
+ (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags !=
+ ICMP4_echo_reply
+ && (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags !=
+ ICMP4_echo_request || !is_addr_only)))
+ {
+ b0->error = node->errors[SNAT_OUT2IN_ERROR_BAD_ICMP_TYPE];
+ next0 = SNAT_OUT2IN_NEXT_DROP;
+ goto out;
+ }
+
+ if (PREDICT_FALSE (identity_nat))
+ {
+ *dont_translate = 1;
+ goto out;
+ }
+ /* Create session initiated by host from external network */
+ s0 =
+ create_session_for_static_mapping (sm, b0, mapping_addr, mapping_port,
+ mapping_fib_index, *addr, *port,
+ *fib_index, *proto, node,
+ thread_index, vlib_time_now (vm));
+
+ if (!s0)
+ {
+ next0 = SNAT_OUT2IN_NEXT_DROP;
+ goto out;
+ }
+ }
+ else
+ {
+ if (PREDICT_FALSE
+ (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags !=
+ ICMP4_echo_reply
+ && vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags !=
+ ICMP4_echo_request
+ && !icmp_type_is_error_message (vnet_buffer (b0)->ip.
+ reass.icmp_type_or_tcp_flags)))
+ {
+ b0->error = node->errors[SNAT_OUT2IN_ERROR_BAD_ICMP_TYPE];
+ next0 = SNAT_OUT2IN_NEXT_DROP;
+ goto out;
+ }
+
+ s0 = pool_elt_at_index (tsm->sessions, value0.value);
+ }
+
+out:
+ if (s0)
+ {
+ *addr = s0->in2out.addr;
+ *port = s0->in2out.port;
+ *fib_index = s0->in2out.fib_index;
+ }
+ if (d)
+ *(snat_session_t **) d = s0;
+ return next0;
+}
+#endif
+
+#ifndef CLIB_MARCH_VARIANT
+/**
+ * Get address and port values to be used for ICMP packet translation
+ *
+ * @param[in] sm NAT main
+ * @param[in,out] node NAT node runtime
+ * @param[in] thread_index thread index
+ * @param[in,out] b0 buffer containing packet to be translated
+ * @param[in,out] ip0 ip header
+ * @param[out] p_proto protocol used for matching
+ * @param[out] p_value address and port after NAT translation
+ * @param[out] p_dont_translate if packet should not be translated
+ * @param d optional parameter
+ * @param e optional parameter
+ */
+u32
+icmp_match_out2in_fast (snat_main_t * sm, vlib_node_runtime_t * node,
+ u32 thread_index, vlib_buffer_t * b0,
+ ip4_header_t * ip0, ip4_address_t * mapping_addr,
+ u16 * mapping_port, u32 * mapping_fib_index,
+ nat_protocol_t * proto, void *d, void *e,
+ u8 * dont_translate)
+{
+ u32 sw_if_index0;
+ u32 rx_fib_index0;
+ u8 is_addr_only;
+ u32 next0 = ~0;
+ int err;
+ ip4_address_t addr;
+ u16 port;
+ *dont_translate = 0;
+
+ sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
+ rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
+
+ err = icmp_get_key (b0, ip0, &addr, &port, proto);
+ if (err != -1)
+ {
+ b0->error = node->errors[err];
+ next0 = SNAT_OUT2IN_NEXT_DROP;
+ goto out;
+ }
+ if (snat_static_mapping_match
+ (sm, addr, port, rx_fib_index0, *proto, mapping_addr, mapping_port,
+ mapping_fib_index, 1, &is_addr_only, 0, 0, 0, 0, 0))
+ {
+ /* Don't NAT packet aimed at the intfc address */
+ if (is_interface_addr (sm, node, sw_if_index0, ip0->dst_address.as_u32))
+ {
+ *dont_translate = 1;
+ goto out;
+ }
+ b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
+ next0 = SNAT_OUT2IN_NEXT_DROP;
+ goto out;
+ }
+
+ if (PREDICT_FALSE
+ (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags != ICMP4_echo_reply
+ && (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags !=
+ ICMP4_echo_request || !is_addr_only)
+ && !icmp_type_is_error_message (vnet_buffer (b0)->ip.
+ reass.icmp_type_or_tcp_flags)))
+ {
+ b0->error = node->errors[SNAT_OUT2IN_ERROR_BAD_ICMP_TYPE];
+ next0 = SNAT_OUT2IN_NEXT_DROP;
+ goto out;
+ }
+
+out:
+ return next0;
+}
+#endif
+
+#ifndef CLIB_MARCH_VARIANT
+u32
+icmp_out2in (snat_main_t * sm,
+ vlib_buffer_t * b0,
+ ip4_header_t * ip0,
+ icmp46_header_t * icmp0,
+ u32 sw_if_index0,
+ u32 rx_fib_index0,
+ vlib_node_runtime_t * node,
+ u32 next0, u32 thread_index, void *d, void *e)
+{
+ icmp_echo_header_t *echo0, *inner_echo0 = 0;
+ ip4_header_t *inner_ip0 = 0;
+ void *l4_header = 0;
+ icmp46_header_t *inner_icmp0;
+ u8 dont_translate;
+ u32 new_addr0, old_addr0;
+ u16 old_id0, new_id0;
+ ip_csum_t sum0;
+ u16 checksum0;
+ u32 next0_tmp;
+ vlib_main_t *vm = vlib_get_main ();
+ ip4_address_t addr;
+ u16 port;
+ u32 fib_index;
+ nat_protocol_t proto;
+
+ echo0 = (icmp_echo_header_t *) (icmp0 + 1);
+
+ next0_tmp = sm->icmp_match_out2in_cb (sm, node, thread_index, b0, ip0,
+ &addr, &port, &fib_index, &proto,
+ d, e, &dont_translate);
+ if (next0_tmp != ~0)
+ next0 = next0_tmp;
+ if (next0 == SNAT_OUT2IN_NEXT_DROP || dont_translate)
+ goto out;
+
+ if (PREDICT_TRUE (!ip4_is_fragment (ip0)))
+ {
+ sum0 =
+ ip_incremental_checksum_buffer (vm, b0,
+ (u8 *) icmp0 -
+ (u8 *) vlib_buffer_get_current (b0),
+ ntohs (ip0->length) -
+ ip4_header_bytes (ip0), 0);
+ checksum0 = ~ip_csum_fold (sum0);
+ if (checksum0 != 0 && checksum0 != 0xffff)
+ {
+ next0 = SNAT_OUT2IN_NEXT_DROP;
+ goto out;
+ }
+ }
+
+ old_addr0 = ip0->dst_address.as_u32;
+ new_addr0 = ip0->dst_address.as_u32 = addr.as_u32;
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = fib_index;
+
+ sum0 = ip0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
+ dst_address /* changed member */ );
+ ip0->checksum = ip_csum_fold (sum0);
+
+
+ if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
+ {
+ if (icmp0->checksum == 0)
+ icmp0->checksum = 0xffff;
+
+ if (!icmp_type_is_error_message (icmp0->type))
+ {
+ new_id0 = port;
+ if (PREDICT_FALSE (new_id0 != echo0->identifier))
+ {
+ old_id0 = echo0->identifier;
+ new_id0 = port;
+ echo0->identifier = new_id0;
+
+ sum0 = icmp0->checksum;
+ sum0 =
+ ip_csum_update (sum0, old_id0, new_id0, icmp_echo_header_t,
+ identifier /* changed member */ );
+ icmp0->checksum = ip_csum_fold (sum0);
+ }
+ }
+ else
+ {
+ inner_ip0 = (ip4_header_t *) (echo0 + 1);
+ l4_header = ip4_next_header (inner_ip0);
+
+ if (!ip4_header_checksum_is_valid (inner_ip0))
+ {
+ next0 = SNAT_OUT2IN_NEXT_DROP;
+ goto out;
+ }
+
+ old_addr0 = inner_ip0->src_address.as_u32;
+ inner_ip0->src_address = addr;
+ new_addr0 = inner_ip0->src_address.as_u32;
+
+ sum0 = icmp0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
+ src_address /* changed member */ );
+ icmp0->checksum = ip_csum_fold (sum0);
+
+ switch (proto)
+ {
+ case NAT_PROTOCOL_ICMP:
+ inner_icmp0 = (icmp46_header_t *) l4_header;
+ inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1);
+
+ old_id0 = inner_echo0->identifier;
+ new_id0 = port;
+ inner_echo0->identifier = new_id0;
+
+ sum0 = icmp0->checksum;
+ sum0 =
+ ip_csum_update (sum0, old_id0, new_id0, icmp_echo_header_t,
+ identifier);
+ icmp0->checksum = ip_csum_fold (sum0);
+ break;
+ case NAT_PROTOCOL_UDP:
+ case NAT_PROTOCOL_TCP:
+ old_id0 = ((tcp_udp_header_t *) l4_header)->src_port;
+ new_id0 = port;
+ ((tcp_udp_header_t *) l4_header)->src_port = new_id0;
+
+ sum0 = icmp0->checksum;
+ sum0 = ip_csum_update (sum0, old_id0, new_id0, tcp_udp_header_t,
+ src_port);
+ icmp0->checksum = ip_csum_fold (sum0);
+ break;
+ default:
+ ASSERT (0);
+ }
+ }
+ }
+
+out:
+ return next0;
+}
+#endif
+
+static inline u32
+icmp_out2in_slow_path (snat_main_t * sm,
+ vlib_buffer_t * b0,
+ ip4_header_t * ip0,
+ icmp46_header_t * icmp0,
+ u32 sw_if_index0,
+ u32 rx_fib_index0,
+ vlib_node_runtime_t * node,
+ u32 next0, f64 now,
+ u32 thread_index, snat_session_t ** p_s0)
+{
+ vlib_main_t *vm = vlib_get_main ();
+
+ next0 = icmp_out2in (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
+ next0, thread_index, p_s0, 0);
+ snat_session_t *s0 = *p_s0;
+ if (PREDICT_TRUE (next0 != SNAT_OUT2IN_NEXT_DROP && s0))
+ {
+ /* Accounting */
+ nat44_ei_session_update_counters (
+ s0, now, vlib_buffer_length_in_chain (vm, b0), thread_index);
+ /* Per-user LRU list maintenance */
+ nat44_session_update_lru (sm, s0, thread_index);
+ }
+ return next0;
+}
+
+static int
+nat_out2in_sm_unknown_proto (snat_main_t * sm,
+ vlib_buffer_t * b,
+ ip4_header_t * ip, u32 rx_fib_index)
+{
+ clib_bihash_kv_8_8_t kv, value;
+ snat_static_mapping_t *m;
+ u32 old_addr, new_addr;
+ ip_csum_t sum;
+
+ init_nat_k (&kv, ip->dst_address, 0, 0, 0);
+ if (clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value))
+ return 1;
+
+ m = pool_elt_at_index (sm->static_mappings, value.value);
+
+ old_addr = ip->dst_address.as_u32;
+ new_addr = ip->dst_address.as_u32 = m->local_addr.as_u32;
+ sum = ip->checksum;
+ sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, dst_address);
+ ip->checksum = ip_csum_fold (sum);
+
+ vnet_buffer (b)->sw_if_index[VLIB_TX] = m->fib_index;
+ return 0;
+}
+
+VLIB_NODE_FN (snat_out2in_node) (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ u32 n_left_from, *from;
+ snat_main_t *sm = &snat_main;
+ f64 now = vlib_time_now (vm);
+ u32 thread_index = vm->thread_index;
+ snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
+
+ from = vlib_frame_vector_args (frame);
+ n_left_from = frame->n_vectors;
+
+ vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
+ u16 nexts[VLIB_FRAME_SIZE], *next = nexts;
+ vlib_get_buffers (vm, from, b, n_left_from);
+
+ while (n_left_from >= 2)
+ {
+ vlib_buffer_t *b0, *b1;
+ u32 next0 = SNAT_OUT2IN_NEXT_LOOKUP;
+ u32 next1 = SNAT_OUT2IN_NEXT_LOOKUP;
+ u32 sw_if_index0, sw_if_index1;
+ ip4_header_t *ip0, *ip1;
+ ip_csum_t sum0, sum1;
+ u32 new_addr0, old_addr0;
+ u16 new_port0, old_port0;
+ u32 new_addr1, old_addr1;
+ u16 new_port1, old_port1;
+ udp_header_t *udp0, *udp1;
+ tcp_header_t *tcp0, *tcp1;
+ icmp46_header_t *icmp0, *icmp1;
+ u32 rx_fib_index0, rx_fib_index1;
+ u32 proto0, proto1;
+ snat_session_t *s0 = 0, *s1 = 0;
+ clib_bihash_kv_8_8_t kv0, kv1, value0, value1;
+ u8 identity_nat0, identity_nat1;
+ ip4_address_t sm_addr0, sm_addr1;
+ u16 sm_port0, sm_port1;
+ u32 sm_fib_index0, sm_fib_index1;
+
+ b0 = *b;
+ b++;
+ b1 = *b;
+ b++;
+
+ /* Prefetch next iteration. */
+ if (PREDICT_TRUE (n_left_from >= 4))
+ {
+ vlib_buffer_t *p2, *p3;
+
+ p2 = *b;
+ p3 = *(b + 1);
+
+ vlib_prefetch_buffer_header (p2, LOAD);
+ vlib_prefetch_buffer_header (p3, LOAD);
+
+ CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, LOAD);
+ CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, LOAD);
+ }
+
+ vnet_buffer (b0)->snat.flags = 0;
+ vnet_buffer (b1)->snat.flags = 0;
+
+ ip0 = vlib_buffer_get_current (b0);
+ udp0 = ip4_next_header (ip0);
+ tcp0 = (tcp_header_t *) udp0;
+ icmp0 = (icmp46_header_t *) udp0;
+
+ sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
+ rx_fib_index0 = vec_elt (sm->ip4_main->fib_index_by_sw_if_index,
+ sw_if_index0);
+
+ if (PREDICT_FALSE (ip0->ttl == 1))
+ {
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
+ icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
+ ICMP4_time_exceeded_ttl_exceeded_in_transit,
+ 0);
+ next0 = SNAT_OUT2IN_NEXT_ICMP_ERROR;
+ goto trace0;
+ }
+
+ proto0 = ip_proto_to_nat_proto (ip0->protocol);
+
+ if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_OTHER))
+ {
+ if (nat_out2in_sm_unknown_proto (sm, b0, ip0, rx_fib_index0))
+ {
+ if (!sm->forwarding_enabled)
+ {
+ b0->error =
+ node->errors[SNAT_OUT2IN_ERROR_UNSUPPORTED_PROTOCOL];
+ next0 = SNAT_OUT2IN_NEXT_DROP;
+ }
+ }
+ vlib_increment_simple_counter (&sm->counters.slowpath.out2in.other,
+ thread_index, sw_if_index0, 1);
+
+ goto trace0;
+ }
+
+ if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP))
+ {
+ next0 = icmp_out2in_slow_path
+ (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
+ next0, now, thread_index, &s0);
+ vlib_increment_simple_counter (&sm->counters.slowpath.out2in.icmp,
+ thread_index, sw_if_index0, 1);
+ goto trace0;
+ }
+
+ init_nat_k (&kv0, ip0->dst_address,
+ vnet_buffer (b0)->ip.reass.l4_dst_port, rx_fib_index0,
+ proto0);
+ if (clib_bihash_search_8_8
+ (&sm->per_thread_data[thread_index].out2in, &kv0, &value0))
+ {
+ /* Try to match static mapping by external address and port,
+ destination address and port in packet */
+ if (snat_static_mapping_match
+ (sm, ip0->dst_address,
+ vnet_buffer (b0)->ip.reass.l4_dst_port, rx_fib_index0,
+ proto0, &sm_addr0, &sm_port0, &sm_fib_index0, 1, 0, 0, 0,
+ 0, &identity_nat0, 0))
+ {
+ /*
+ * Send DHCP packets to the ipv4 stack, or we won't
+ * be able to use dhcp client on the outside interface
+ */
+ if (PREDICT_FALSE
+ (proto0 == NAT_PROTOCOL_UDP
+ && (vnet_buffer (b0)->ip.reass.l4_dst_port ==
+ clib_host_to_net_u16 (UDP_DST_PORT_dhcp_to_client))))
+ {
+ vnet_feature_next (&next0, b0);
+ goto trace0;
+ }
+
+ if (!sm->forwarding_enabled)
+ {
+ b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
+ next0 = SNAT_OUT2IN_NEXT_DROP;
+ }
+ goto trace0;
+ }
+
+ if (PREDICT_FALSE (identity_nat0))
+ goto trace0;
+
+ /* Create session initiated by host from external network */
+ s0 = create_session_for_static_mapping (sm, b0,
+ sm_addr0, sm_port0,
+ sm_fib_index0,
+ ip0->dst_address,
+ vnet_buffer (b0)->ip.
+ reass.l4_dst_port,
+ rx_fib_index0, proto0, node,
+ thread_index, now);
+ if (!s0)
+ {
+ next0 = SNAT_OUT2IN_NEXT_DROP;
+ goto trace0;
+ }
+ }
+ else
+ s0 = pool_elt_at_index (tsm->sessions, value0.value);
+
+ old_addr0 = ip0->dst_address.as_u32;
+ ip0->dst_address = s0->in2out.addr;
+ new_addr0 = ip0->dst_address.as_u32;
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->in2out.fib_index;
+
+ sum0 = ip0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
+ ip4_header_t, dst_address /* changed member */ );
+ ip0->checksum = ip_csum_fold (sum0);
+
+ if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP))
+ {
+ if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
+ {
+ old_port0 = vnet_buffer (b0)->ip.reass.l4_dst_port;
+ new_port0 = udp0->dst_port = s0->in2out.port;
+ sum0 = tcp0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
+ ip4_header_t,
+ dst_address /* changed member */ );
+
+ sum0 = ip_csum_update (sum0, old_port0, new_port0,
+ ip4_header_t /* cheat */ ,
+ length /* changed member */ );
+ tcp0->checksum = ip_csum_fold (sum0);
+ }
+ vlib_increment_simple_counter (&sm->counters.slowpath.out2in.tcp,
+ thread_index, sw_if_index0, 1);
+ }
+ else
+ {
+ if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
+ {
+ old_port0 = vnet_buffer (b0)->ip.reass.l4_dst_port;
+ new_port0 = udp0->dst_port = s0->in2out.port;
+ if (PREDICT_FALSE (udp0->checksum))
+ {
+ sum0 = udp0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, dst_address /* changed member */
+ );
+ sum0 =
+ ip_csum_update (sum0, old_port0, new_port0,
+ ip4_header_t /* cheat */ ,
+ length /* changed member */ );
+ udp0->checksum = ip_csum_fold (sum0);
+ }
+ }
+ vlib_increment_simple_counter (&sm->counters.slowpath.out2in.udp,
+ thread_index, sw_if_index0, 1);
+ }
+
+ /* Accounting */
+ nat44_ei_session_update_counters (
+ s0, now, vlib_buffer_length_in_chain (vm, b0), thread_index);
+ /* Per-user LRU list maintenance */
+ nat44_session_update_lru (sm, s0, thread_index);
+ trace0:
+
+ if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
+ && (b0->flags & VLIB_BUFFER_IS_TRACED)))
+ {
+ snat_out2in_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t));
+ t->sw_if_index = sw_if_index0;
+ t->next_index = next0;
+ t->session_index = ~0;
+ if (s0)
+ t->session_index =
+ s0 - sm->per_thread_data[thread_index].sessions;
+ }
+
+ if (next0 == SNAT_OUT2IN_NEXT_DROP)
+ {
+ vlib_increment_simple_counter (&sm->counters.slowpath.out2in.drops,
+ thread_index, sw_if_index0, 1);
+ }
+
+
+ ip1 = vlib_buffer_get_current (b1);
+ udp1 = ip4_next_header (ip1);
+ tcp1 = (tcp_header_t *) udp1;
+ icmp1 = (icmp46_header_t *) udp1;
+
+ sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
+ rx_fib_index1 = vec_elt (sm->ip4_main->fib_index_by_sw_if_index,
+ sw_if_index1);
+
+ if (PREDICT_FALSE (ip1->ttl == 1))
+ {
+ vnet_buffer (b1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
+ icmp4_error_set_vnet_buffer (b1, ICMP4_time_exceeded,
+ ICMP4_time_exceeded_ttl_exceeded_in_transit,
+ 0);
+ next1 = SNAT_OUT2IN_NEXT_ICMP_ERROR;
+ goto trace1;
+ }
+
+ proto1 = ip_proto_to_nat_proto (ip1->protocol);
+
+ if (PREDICT_FALSE (proto1 == NAT_PROTOCOL_OTHER))
+ {
+ if (nat_out2in_sm_unknown_proto (sm, b1, ip1, rx_fib_index1))
+ {
+ if (!sm->forwarding_enabled)
+ {
+ b1->error =
+ node->errors[SNAT_OUT2IN_ERROR_UNSUPPORTED_PROTOCOL];
+ next1 = SNAT_OUT2IN_NEXT_DROP;
+ }
+ }
+ vlib_increment_simple_counter (&sm->counters.slowpath.out2in.other,
+ thread_index, sw_if_index1, 1);
+ goto trace1;
+ }
+
+ if (PREDICT_FALSE (proto1 == NAT_PROTOCOL_ICMP))
+ {
+ next1 = icmp_out2in_slow_path
+ (sm, b1, ip1, icmp1, sw_if_index1, rx_fib_index1, node,
+ next1, now, thread_index, &s1);
+ vlib_increment_simple_counter (&sm->counters.slowpath.out2in.icmp,
+ thread_index, sw_if_index1, 1);
+ goto trace1;
+ }
+
+ init_nat_k (&kv1, ip1->dst_address,
+ vnet_buffer (b1)->ip.reass.l4_dst_port, rx_fib_index1,
+ proto1);
+
+ if (clib_bihash_search_8_8
+ (&sm->per_thread_data[thread_index].out2in, &kv1, &value1))
+ {
+ /* Try to match static mapping by external address and port,
+ destination address and port in packet */
+ if (snat_static_mapping_match
+ (sm, ip1->dst_address,
+ vnet_buffer (b1)->ip.reass.l4_dst_port, proto1,
+ rx_fib_index1, &sm_addr1, &sm_port1, &sm_fib_index1, 1, 0,
+ 0, 0, 0, &identity_nat1, 0))
+ {
+ /*
+ * Send DHCP packets to the ipv4 stack, or we won't
+ * be able to use dhcp client on the outside interface
+ */
+ if (PREDICT_FALSE
+ (proto1 == NAT_PROTOCOL_UDP
+ && (vnet_buffer (b1)->ip.reass.l4_dst_port ==
+ clib_host_to_net_u16 (UDP_DST_PORT_dhcp_to_client))))
+ {
+ vnet_feature_next (&next1, b1);
+ goto trace1;
+ }
+
+ if (!sm->forwarding_enabled)
+ {
+ b1->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
+ next1 = SNAT_OUT2IN_NEXT_DROP;
+ }
+ goto trace1;
+ }
+
+ if (PREDICT_FALSE (identity_nat1))
+ goto trace1;
+
+ /* Create session initiated by host from external network */
+ s1 =
+ create_session_for_static_mapping (sm, b1, sm_addr1, sm_port1,
+ sm_fib_index1,
+ ip1->dst_address,
+ vnet_buffer (b1)->ip.
+ reass.l4_dst_port,
+ rx_fib_index1, proto1, node,
+ thread_index, now);
+ if (!s1)
+ {
+ next1 = SNAT_OUT2IN_NEXT_DROP;
+ goto trace1;
+ }
+ }
+ else
+ s1 =
+ pool_elt_at_index (sm->per_thread_data[thread_index].sessions,
+ value1.value);
+
+ old_addr1 = ip1->dst_address.as_u32;
+ ip1->dst_address = s1->in2out.addr;
+ new_addr1 = ip1->dst_address.as_u32;
+ vnet_buffer (b1)->sw_if_index[VLIB_TX] = s1->in2out.fib_index;
+
+ sum1 = ip1->checksum;
+ sum1 = ip_csum_update (sum1, old_addr1, new_addr1,
+ ip4_header_t, dst_address /* changed member */ );
+ ip1->checksum = ip_csum_fold (sum1);
+
+ if (PREDICT_TRUE (proto1 == NAT_PROTOCOL_TCP))
+ {
+ if (!vnet_buffer (b1)->ip.reass.is_non_first_fragment)
+ {
+ old_port1 = vnet_buffer (b1)->ip.reass.l4_dst_port;
+ new_port1 = udp1->dst_port = s1->in2out.port;
+
+ sum1 = tcp1->checksum;
+ sum1 = ip_csum_update (sum1, old_addr1, new_addr1,
+ ip4_header_t,
+ dst_address /* changed member */ );
+
+ sum1 = ip_csum_update (sum1, old_port1, new_port1,
+ ip4_header_t /* cheat */ ,
+ length /* changed member */ );
+ tcp1->checksum = ip_csum_fold (sum1);
+ }
+ vlib_increment_simple_counter (&sm->counters.slowpath.out2in.tcp,
+ thread_index, sw_if_index1, 1);
+ }
+ else
+ {
+ if (!vnet_buffer (b1)->ip.reass.is_non_first_fragment)
+ {
+ old_port1 = vnet_buffer (b1)->ip.reass.l4_dst_port;
+ new_port1 = udp1->dst_port = s1->in2out.port;
+ if (PREDICT_FALSE (udp1->checksum))
+ {
+
+ sum1 = udp1->checksum;
+ sum1 =
+ ip_csum_update (sum1, old_addr1, new_addr1,
+ ip4_header_t,
+ dst_address /* changed member */ );
+ sum1 =
+ ip_csum_update (sum1, old_port1, new_port1,
+ ip4_header_t /* cheat */ ,
+ length /* changed member */ );
+ udp1->checksum = ip_csum_fold (sum1);
+ }
+ }
+ vlib_increment_simple_counter (&sm->counters.slowpath.out2in.udp,
+ thread_index, sw_if_index1, 1);
+ }
+
+ /* Accounting */
+ nat44_ei_session_update_counters (
+ s1, now, vlib_buffer_length_in_chain (vm, b1), thread_index);
+ /* Per-user LRU list maintenance */
+ nat44_session_update_lru (sm, s1, thread_index);
+ trace1:
+
+ if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
+ && (b1->flags & VLIB_BUFFER_IS_TRACED)))
+ {
+ snat_out2in_trace_t *t = vlib_add_trace (vm, node, b1, sizeof (*t));
+ t->sw_if_index = sw_if_index1;
+ t->next_index = next1;
+ t->session_index = ~0;
+ if (s1)
+ t->session_index =
+ s1 - sm->per_thread_data[thread_index].sessions;
+ }
+
+ if (next1 == SNAT_OUT2IN_NEXT_DROP)
+ {
+ vlib_increment_simple_counter (&sm->counters.slowpath.out2in.drops,
+ thread_index, sw_if_index1, 1);
+ }
+
+ n_left_from -= 2;
+ next[0] = next0;
+ next[1] = next1;
+ next += 2;
+ }
+
+ while (n_left_from > 0)
+ {
+ vlib_buffer_t *b0;
+ u32 next0 = SNAT_OUT2IN_NEXT_LOOKUP;
+ u32 sw_if_index0;
+ ip4_header_t *ip0;
+ ip_csum_t sum0;
+ u32 new_addr0, old_addr0;
+ u16 new_port0, old_port0;
+ udp_header_t *udp0;
+ tcp_header_t *tcp0;
+ icmp46_header_t *icmp0;
+ u32 rx_fib_index0;
+ u32 proto0;
+ snat_session_t *s0 = 0;
+ clib_bihash_kv_8_8_t kv0, value0;
+ u8 identity_nat0;
+ ip4_address_t sm_addr0;
+ u16 sm_port0;
+ u32 sm_fib_index0;
+
+ b0 = *b;
+ ++b;
+
+ vnet_buffer (b0)->snat.flags = 0;
+
+ ip0 = vlib_buffer_get_current (b0);
+ udp0 = ip4_next_header (ip0);
+ tcp0 = (tcp_header_t *) udp0;
+ icmp0 = (icmp46_header_t *) udp0;
+
+ sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
+ rx_fib_index0 = vec_elt (sm->ip4_main->fib_index_by_sw_if_index,
+ sw_if_index0);
+
+ proto0 = ip_proto_to_nat_proto (ip0->protocol);
+
+ if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_OTHER))
+ {
+ if (nat_out2in_sm_unknown_proto (sm, b0, ip0, rx_fib_index0))
+ {
+ if (!sm->forwarding_enabled)
+ {
+ b0->error =
+ node->errors[SNAT_OUT2IN_ERROR_UNSUPPORTED_PROTOCOL];
+ next0 = SNAT_OUT2IN_NEXT_DROP;
+ }
+ }
+ vlib_increment_simple_counter (&sm->counters.slowpath.out2in.other,
+ thread_index, sw_if_index0, 1);
+ goto trace00;
+ }
+
+ if (PREDICT_FALSE (ip0->ttl == 1))
+ {
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
+ icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
+ ICMP4_time_exceeded_ttl_exceeded_in_transit,
+ 0);
+ next0 = SNAT_OUT2IN_NEXT_ICMP_ERROR;
+ goto trace00;
+ }
+
+ if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP))
+ {
+ next0 = icmp_out2in_slow_path
+ (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
+ next0, now, thread_index, &s0);
+ vlib_increment_simple_counter (&sm->counters.slowpath.out2in.icmp,
+ thread_index, sw_if_index0, 1);
+ goto trace00;
+ }
+
+ init_nat_k (&kv0, ip0->dst_address,
+ vnet_buffer (b0)->ip.reass.l4_dst_port, rx_fib_index0,
+ proto0);
+
+ if (clib_bihash_search_8_8
+ (&sm->per_thread_data[thread_index].out2in, &kv0, &value0))
+ {
+ /* Try to match static mapping by external address and port,
+ destination address and port in packet */
+ if (snat_static_mapping_match
+ (sm, ip0->dst_address,
+ vnet_buffer (b0)->ip.reass.l4_dst_port, rx_fib_index0,
+ proto0, &sm_addr0, &sm_port0, &sm_fib_index0, 1, 0, 0, 0,
+ 0, &identity_nat0, 0))
+ {
+ /*
+ * Send DHCP packets to the ipv4 stack, or we won't
+ * be able to use dhcp client on the outside interface
+ */
+ if (PREDICT_FALSE
+ (proto0 == NAT_PROTOCOL_UDP
+ && (vnet_buffer (b0)->ip.reass.l4_dst_port ==
+ clib_host_to_net_u16 (UDP_DST_PORT_dhcp_to_client))))
+ {
+ vnet_feature_next (&next0, b0);
+ goto trace00;
+ }
+
+ if (!sm->forwarding_enabled)
+ {
+ b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
+ next0 = SNAT_OUT2IN_NEXT_DROP;
+ }
+ goto trace00;
+ }
+
+ if (PREDICT_FALSE (identity_nat0))
+ goto trace00;
+
+ /* Create session initiated by host from external network */
+ s0 = create_session_for_static_mapping (sm, b0,
+ sm_addr0, sm_port0,
+ sm_fib_index0,
+ ip0->dst_address,
+ vnet_buffer (b0)->ip.
+ reass.l4_dst_port,
+ rx_fib_index0, proto0, node,
+ thread_index, now);
+ if (!s0)
+ {
+ next0 = SNAT_OUT2IN_NEXT_DROP;
+ goto trace00;
+ }
+ }
+ else
+ s0 =
+ pool_elt_at_index (sm->per_thread_data[thread_index].sessions,
+ value0.value);
+
+ old_addr0 = ip0->dst_address.as_u32;
+ ip0->dst_address = s0->in2out.addr;
+ new_addr0 = ip0->dst_address.as_u32;
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->in2out.fib_index;
+
+ sum0 = ip0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
+ ip4_header_t, dst_address /* changed member */ );
+ ip0->checksum = ip_csum_fold (sum0);
+
+ if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP))
+ {
+ if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
+ {
+ old_port0 = vnet_buffer (b0)->ip.reass.l4_dst_port;
+ new_port0 = udp0->dst_port = s0->in2out.port;
+
+ sum0 = tcp0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
+ ip4_header_t,
+ dst_address /* changed member */ );
+
+ sum0 = ip_csum_update (sum0, old_port0, new_port0,
+ ip4_header_t /* cheat */ ,
+ length /* changed member */ );
+ tcp0->checksum = ip_csum_fold (sum0);
+ }
+ vlib_increment_simple_counter (&sm->counters.slowpath.out2in.tcp,
+ thread_index, sw_if_index0, 1);
+ }
+ else
+ {
+ if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment)
+ {
+ old_port0 = vnet_buffer (b0)->ip.reass.l4_dst_port;
+ new_port0 = udp0->dst_port = s0->in2out.port;
+ if (PREDICT_FALSE (udp0->checksum))
+ {
+ sum0 = udp0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, dst_address /* changed member */
+ );
+ sum0 =
+ ip_csum_update (sum0, old_port0, new_port0,
+ ip4_header_t /* cheat */ ,
+ length /* changed member */ );
+ udp0->checksum = ip_csum_fold (sum0);
+ }
+ }
+ vlib_increment_simple_counter (&sm->counters.slowpath.out2in.udp,
+ thread_index, sw_if_index0, 1);
+ }
+
+ /* Accounting */
+ nat44_ei_session_update_counters (
+ s0, now, vlib_buffer_length_in_chain (vm, b0), thread_index);
+ /* Per-user LRU list maintenance */
+ nat44_session_update_lru (sm, s0, thread_index);
+ trace00:
+
+ if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
+ && (b0->flags & VLIB_BUFFER_IS_TRACED)))
+ {
+ snat_out2in_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t));
+ t->sw_if_index = sw_if_index0;
+ t->next_index = next0;
+ t->session_index = ~0;
+ if (s0)
+ t->session_index =
+ s0 - sm->per_thread_data[thread_index].sessions;
+ }
+
+ if (next0 == SNAT_OUT2IN_NEXT_DROP)
+ {
+ vlib_increment_simple_counter (&sm->counters.slowpath.out2in.drops,
+ thread_index, sw_if_index0, 1);
+ }
+
+ n_left_from--;
+ next[0] = next0;
+ next++;
+ }
+
+ vlib_buffer_enqueue_to_next (vm, node, from, (u16 *) nexts,
+ frame->n_vectors);
+
+ return frame->n_vectors;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (snat_out2in_node) = {
+ .name = "nat44-out2in",
+ .vector_size = sizeof (u32),
+ .format_trace = format_snat_out2in_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+
+ .n_errors = ARRAY_LEN(snat_out2in_error_strings),
+ .error_strings = snat_out2in_error_strings,
+
+ .runtime_data_bytes = sizeof (snat_runtime_t),
+
+ .n_next_nodes = SNAT_OUT2IN_N_NEXT,
+
+ /* edit / add dispositions here */
+ .next_nodes = {
+ [SNAT_OUT2IN_NEXT_DROP] = "error-drop",
+ [SNAT_OUT2IN_NEXT_LOOKUP] = "ip4-lookup",
+ [SNAT_OUT2IN_NEXT_ICMP_ERROR] = "ip4-icmp-error",
+ },
+};
+/* *INDENT-ON* */
+
+VLIB_NODE_FN (snat_out2in_fast_node) (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ u32 n_left_from, *from;
+ snat_main_t *sm = &snat_main;
+
+ from = vlib_frame_vector_args (frame);
+ n_left_from = frame->n_vectors;
+
+ vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
+ u16 nexts[VLIB_FRAME_SIZE], *next = nexts;
+ vlib_get_buffers (vm, from, b, n_left_from);
+ while (n_left_from > 0)
+ {
+ vlib_buffer_t *b0;
+ u32 next0 = SNAT_OUT2IN_NEXT_DROP;
+ u32 sw_if_index0;
+ ip4_header_t *ip0;
+ ip_csum_t sum0;
+ u32 new_addr0, old_addr0;
+ u16 new_port0, old_port0;
+ udp_header_t *udp0;
+ tcp_header_t *tcp0;
+ icmp46_header_t *icmp0;
+ u32 proto0;
+ u32 rx_fib_index0;
+ ip4_address_t sm_addr0;
+ u16 sm_port0;
+ u32 sm_fib_index0;
+
+ b0 = *b;
+ b++;
+
+ ip0 = vlib_buffer_get_current (b0);
+ udp0 = ip4_next_header (ip0);
+ tcp0 = (tcp_header_t *) udp0;
+ icmp0 = (icmp46_header_t *) udp0;
+
+ sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
+ rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
+
+ vnet_feature_next (&next0, b0);
+
+ if (PREDICT_FALSE (ip0->ttl == 1))
+ {
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
+ icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded,
+ ICMP4_time_exceeded_ttl_exceeded_in_transit,
+ 0);
+ next0 = SNAT_OUT2IN_NEXT_ICMP_ERROR;
+ goto trace00;
+ }
+
+ proto0 = ip_proto_to_nat_proto (ip0->protocol);
+
+ if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_OTHER))
+ goto trace00;
+
+ if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP))
+ {
+ next0 = icmp_out2in (sm, b0, ip0, icmp0, sw_if_index0,
+ rx_fib_index0, node, next0, ~0, 0, 0);
+ goto trace00;
+ }
+
+ if (snat_static_mapping_match
+ (sm, ip0->dst_address, udp0->dst_port, rx_fib_index0, proto0,
+ &sm_addr0, &sm_port0, &sm_fib_index0, 1, 0, 0, 0, 0, 0, 0))
+ {
+ b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
+ goto trace00;
+ }
+
+ new_addr0 = sm_addr0.as_u32;
+ new_port0 = sm_port0;
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = sm_fib_index0;
+ old_addr0 = ip0->dst_address.as_u32;
+ ip0->dst_address.as_u32 = new_addr0;
+
+ sum0 = ip0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
+ ip4_header_t, dst_address /* changed member */ );
+ ip0->checksum = ip_csum_fold (sum0);
+
+ if (PREDICT_FALSE (new_port0 != udp0->dst_port))
+ {
+ old_port0 = udp0->dst_port;
+ udp0->dst_port = new_port0;
+
+ if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP))
+ {
+ sum0 = tcp0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
+ ip4_header_t,
+ dst_address /* changed member */ );
+ sum0 = ip_csum_update (sum0, old_port0, new_port0,
+ ip4_header_t /* cheat */ ,
+ length /* changed member */ );
+ tcp0->checksum = ip_csum_fold (sum0);
+ }
+ else if (udp0->checksum)
+ {
+ sum0 = udp0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
+ ip4_header_t,
+ dst_address /* changed member */ );
+ sum0 = ip_csum_update (sum0, old_port0, new_port0,
+ ip4_header_t /* cheat */ ,
+ length /* changed member */ );
+ udp0->checksum = ip_csum_fold (sum0);
+ }
+ }
+ else
+ {
+ if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP))
+ {
+ sum0 = tcp0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
+ ip4_header_t,
+ dst_address /* changed member */ );
+ tcp0->checksum = ip_csum_fold (sum0);
+ }
+ else if (udp0->checksum)
+ {
+ sum0 = udp0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
+ ip4_header_t,
+ dst_address /* changed member */ );
+ udp0->checksum = ip_csum_fold (sum0);
+ }
+ }
+
+ trace00:
+
+ if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
+ && (b0->flags & VLIB_BUFFER_IS_TRACED)))
+ {
+ snat_out2in_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t));
+ t->sw_if_index = sw_if_index0;
+ t->next_index = next0;
+ }
+
+ if (next0 == SNAT_OUT2IN_NEXT_DROP)
+ {
+ vlib_increment_simple_counter (&sm->counters.fastpath.out2in.drops,
+ vm->thread_index, sw_if_index0, 1);
+ }
+
+ n_left_from--;
+ next[0] = next0;
+ next++;
+ }
+
+ vlib_buffer_enqueue_to_next (vm, node, from, (u16 *) nexts,
+ frame->n_vectors);
+
+ return frame->n_vectors;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (snat_out2in_fast_node) = {
+ .name = "nat44-out2in-fast",
+ .vector_size = sizeof (u32),
+ .format_trace = format_snat_out2in_fast_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+
+ .n_errors = ARRAY_LEN(snat_out2in_error_strings),
+ .error_strings = snat_out2in_error_strings,
+
+ .runtime_data_bytes = sizeof (snat_runtime_t),
+
+ .n_next_nodes = SNAT_OUT2IN_N_NEXT,
+
+ /* edit / add dispositions here */
+ .next_nodes = {
+ [SNAT_OUT2IN_NEXT_LOOKUP] = "ip4-lookup",
+ [SNAT_OUT2IN_NEXT_DROP] = "error-drop",
+ [SNAT_OUT2IN_NEXT_ICMP_ERROR] = "ip4-icmp-error",
+ },
+};
+/* *INDENT-ON* */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */