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authorFilip Varga <fivarga@cisco.com>2020-07-21 10:27:39 +0200
committerOle Trøan <otroan@employees.org>2020-08-13 10:06:33 +0000
commit603e75465899385a95350f3c96499050f7f960a5 (patch)
treef7a7130769ea795c1c3460db3aea99a49a309b13 /src/plugins/nat/det44/det44_in2out.c
parentde118da58e80aec43f4b816a1ea957634a8bc07c (diff)
nat: move deterministic nat to det44 sub feature
Type: refactor Change-Id: I0bb203102a0e13dd7448e2125925ab356bbd7937 Signed-off-by: Filip Varga <fivarga@cisco.com>
Diffstat (limited to 'src/plugins/nat/det44/det44_in2out.c')
-rw-r--r--src/plugins/nat/det44/det44_in2out.c1067
1 files changed, 1067 insertions, 0 deletions
diff --git a/src/plugins/nat/det44/det44_in2out.c b/src/plugins/nat/det44/det44_in2out.c
new file mode 100644
index 00000000000..3ed1cc77ff6
--- /dev/null
+++ b/src/plugins/nat/det44/det44_in2out.c
@@ -0,0 +1,1067 @@
+/*
+ * Copyright (c) 2020 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 Deterministic NAT (CGN) inside to outside translation
+ */
+
+#include <vlib/vlib.h>
+#include <vnet/vnet.h>
+#include <vnet/ip/ip.h>
+#include <vnet/fib/ip4_fib.h>
+#include <vppinfra/error.h>
+#include <vppinfra/elog.h>
+
+#include <nat/det44/det44.h>
+#include <nat/det44/det44_inlines.h>
+
+#include <nat/lib/lib.h>
+#include <nat/lib/inlines.h>
+#include <nat/lib/nat_inlines.h>
+
+typedef enum
+{
+ DET44_IN2OUT_NEXT_LOOKUP,
+ DET44_IN2OUT_NEXT_DROP,
+ DET44_IN2OUT_NEXT_ICMP_ERROR,
+ DET44_IN2OUT_N_NEXT,
+} det44_in2out_next_t;
+
+typedef struct
+{
+ u32 sw_if_index;
+ u32 next_index;
+ u32 session_index;
+} det44_in2out_trace_t;
+
+#define foreach_det44_in2out_error \
+_(UNSUPPORTED_PROTOCOL, "Unsupported protocol") \
+_(NO_TRANSLATION, "No translation") \
+_(BAD_ICMP_TYPE, "unsupported ICMP type") \
+_(OUT_OF_PORTS, "Out of ports") \
+_(IN2OUT_PACKETS, "Good in2out packets processed")
+
+typedef enum
+{
+#define _(sym,str) DET44_IN2OUT_ERROR_##sym,
+ foreach_det44_in2out_error
+#undef _
+ DET44_IN2OUT_N_ERROR,
+} det44_in2out_error_t;
+
+static char *det44_in2out_error_strings[] = {
+#define _(sym,string) string,
+ foreach_det44_in2out_error
+#undef _
+};
+
+static u8 *
+format_det44_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 *);
+ det44_in2out_trace_t *t = va_arg (*args, det44_in2out_trace_t *);
+
+ s = format (s, "DET44_IN2OUT: sw_if_index %d, next index %d, session %d",
+ t->sw_if_index, t->next_index, t->session_index);
+
+ return s;
+}
+
+#ifndef CLIB_MARCH_VARIANT
+/**
+ * Get address and port values to be used for ICMP packet translation
+ * and create session if needed
+ *
+ * @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_in2out_det (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)
+{
+ det44_main_t *dm = &det44_main;
+ vlib_main_t *vm = vlib_get_main ();
+ icmp46_header_t *icmp0;
+ u32 sw_if_index0;
+ u32 rx_fib_index0;
+ nat_protocol_t protocol;
+ snat_det_out_key_t key0;
+ u32 next0 = ~0;
+ icmp_echo_header_t *echo0, *inner_echo0 = 0;
+ ip4_header_t *inner_ip0;
+ void *l4_header = 0;
+ icmp46_header_t *inner_icmp0;
+ snat_det_map_t *mp0 = 0;
+ ip4_address_t new_addr0;
+ u16 lo_port0, i0;
+ snat_det_session_t *ses0 = 0;
+ ip4_address_t in_addr;
+ u16 in_port;
+ *dont_translate = 0;
+
+ icmp0 = (icmp46_header_t *) ip4_next_header (ip0);
+ echo0 = (icmp_echo_header_t *) (icmp0 + 1);
+ 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);
+
+ if (!icmp_type_is_error_message
+ (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags))
+ {
+ protocol = NAT_PROTOCOL_ICMP;
+ in_addr = ip0->src_address;
+ in_port = vnet_buffer (b0)->ip.reass.l4_src_port;
+ }
+ else
+ {
+ /* if error message, then it's not fragmented and we can access it */
+ inner_ip0 = (ip4_header_t *) (echo0 + 1);
+ l4_header = ip4_next_header (inner_ip0);
+ protocol = ip_proto_to_nat_proto (inner_ip0->protocol);
+ in_addr = inner_ip0->dst_address;
+ switch (protocol)
+ {
+ case NAT_PROTOCOL_ICMP:
+ inner_icmp0 = (icmp46_header_t *) l4_header;
+ inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1);
+ in_port = inner_echo0->identifier;
+ break;
+ case NAT_PROTOCOL_UDP:
+ case NAT_PROTOCOL_TCP:
+ in_port = ((tcp_udp_header_t *) l4_header)->dst_port;
+ break;
+ default:
+ b0->error = node->errors[DET44_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL];
+ next0 = DET44_IN2OUT_NEXT_DROP;
+ goto out;
+ }
+ }
+
+ mp0 = snat_det_map_by_user (&in_addr);
+ if (PREDICT_FALSE (!mp0))
+ {
+ if (PREDICT_FALSE (det44_translate (node, sw_if_index0, ip0,
+ IP_PROTOCOL_ICMP, rx_fib_index0)))
+ {
+ *dont_translate = 1;
+ goto out;
+ }
+ next0 = DET44_IN2OUT_NEXT_DROP;
+ b0->error = node->errors[DET44_IN2OUT_ERROR_NO_TRANSLATION];
+ goto out;
+ }
+
+ snat_det_forward (mp0, &in_addr, &new_addr0, &lo_port0);
+
+ key0.ext_host_addr = ip0->dst_address;
+ key0.ext_host_port = 0;
+
+ ses0 = snat_det_find_ses_by_in (mp0, &in_addr, in_port, key0);
+ if (PREDICT_FALSE (!ses0))
+ {
+ if (PREDICT_FALSE (det44_translate (node, sw_if_index0, ip0,
+ IP_PROTOCOL_ICMP, rx_fib_index0)))
+ {
+ *dont_translate = 1;
+ goto out;
+ }
+ if (icmp0->type != ICMP4_echo_request)
+ {
+ b0->error = node->errors[DET44_IN2OUT_ERROR_BAD_ICMP_TYPE];
+ next0 = DET44_IN2OUT_NEXT_DROP;
+ goto out;
+ }
+ for (i0 = 0; i0 < mp0->ports_per_host; i0++)
+ {
+ key0.out_port = clib_host_to_net_u16 (lo_port0 +
+ ((i0 +
+ clib_net_to_host_u16
+ (echo0->identifier)) %
+ mp0->ports_per_host));
+
+ if (snat_det_get_ses_by_out (mp0, &in_addr, key0.as_u64))
+ continue;
+
+ ses0 =
+ snat_det_ses_create (thread_index, mp0,
+ &in_addr, echo0->identifier, &key0);
+ break;
+ }
+ if (PREDICT_FALSE (!ses0))
+ {
+ next0 = DET44_IN2OUT_NEXT_DROP;
+ b0->error = node->errors[DET44_IN2OUT_ERROR_OUT_OF_PORTS];
+ goto out;
+ }
+ }
+
+ if (PREDICT_FALSE
+ (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[DET44_IN2OUT_ERROR_BAD_ICMP_TYPE];
+ next0 = DET44_IN2OUT_NEXT_DROP;
+ goto out;
+ }
+
+ u32 now = (u32) vlib_time_now (vm);
+
+ ses0->state = DET44_SESSION_ICMP_ACTIVE;
+ ses0->expire = now + dm->timeouts.icmp;
+
+out:
+ *proto = protocol;
+ if (ses0)
+ {
+ *addr = new_addr0;
+ *fib_index = dm->outside_fib_index;
+ *port = ses0->out.out_port;
+ }
+ if (d)
+ *(snat_det_session_t **) d = ses0;
+ if (e)
+ *(snat_det_map_t **) e = mp0;
+ return next0;
+}
+#endif
+
+#ifndef CLIB_MARCH_VARIANT
+u32
+det44_icmp_in2out (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)
+{
+ vlib_main_t *vm = vlib_get_main ();
+ u16 old_id0, new_id0, port, checksum0, old_checksum0, new_checksum0;
+ u32 new_addr0, old_addr0, next0_tmp, fib_index;
+ icmp_echo_header_t *echo0, *inner_echo0;
+ icmp46_header_t *inner_icmp0;
+ ip4_header_t *inner_ip0;
+ ip4_address_t addr;
+ void *l4_header;
+ u8 dont_translate;
+ ip_csum_t sum0;
+ nat_protocol_t protocol;
+
+ echo0 = (icmp_echo_header_t *) (icmp0 + 1);
+ next0_tmp = icmp_match_in2out_det (node, thread_index, b0, ip0,
+ &addr, &port, &fib_index, &protocol,
+ d, e, &dont_translate);
+ if (next0_tmp != ~0)
+ next0 = next0_tmp;
+ if (next0 == DET44_IN2OUT_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 (PREDICT_FALSE (checksum0 != 0 && checksum0 != 0xffff))
+ {
+ next0 = DET44_IN2OUT_NEXT_DROP;
+ goto out;
+ }
+ }
+
+ old_addr0 = ip0->src_address.as_u32;
+ new_addr0 = ip0->src_address.as_u32 = addr.as_u32;
+
+ sum0 = ip0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
+ src_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);
+ 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 = DET44_IN2OUT_NEXT_DROP;
+ goto out;
+ }
+
+ /* update inner destination IP address */
+ old_addr0 = inner_ip0->dst_address.as_u32;
+ inner_ip0->dst_address = addr;
+ new_addr0 = inner_ip0->dst_address.as_u32;
+ sum0 = icmp0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
+ dst_address /* changed member */ );
+ icmp0->checksum = ip_csum_fold (sum0);
+
+ /* update inner IP header checksum */
+ old_checksum0 = inner_ip0->checksum;
+ sum0 = inner_ip0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t,
+ dst_address /* changed member */ );
+ inner_ip0->checksum = ip_csum_fold (sum0);
+ new_checksum0 = inner_ip0->checksum;
+ sum0 = icmp0->checksum;
+ sum0 =
+ ip_csum_update (sum0, old_checksum0, new_checksum0, ip4_header_t,
+ checksum);
+ icmp0->checksum = ip_csum_fold (sum0);
+
+ switch (protocol)
+ {
+ 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)->dst_port;
+ new_id0 = port;
+ ((tcp_udp_header_t *) l4_header)->dst_port = new_id0;
+
+ sum0 = icmp0->checksum;
+ sum0 = ip_csum_update (sum0, old_id0, new_id0, tcp_udp_header_t,
+ dst_port);
+ icmp0->checksum = ip_csum_fold (sum0);
+ break;
+ default:
+ ASSERT (0);
+ }
+ }
+ }
+
+ if (vnet_buffer (b0)->sw_if_index[VLIB_TX] == ~0)
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = fib_index;
+out:
+ return next0;
+}
+#endif
+
+VLIB_NODE_FN (det44_in2out_node) (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ u32 n_left_from, *from, *to_next;
+ det44_in2out_next_t next_index;
+ u32 pkts_processed = 0;
+ det44_main_t *dm = &det44_main;
+ u32 now = (u32) vlib_time_now (vm);
+ u32 thread_index = vm->thread_index;
+
+ 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 >= 4 && n_left_to_next >= 2)
+ {
+ u32 bi0, bi1;
+ vlib_buffer_t *b0, *b1;
+ u32 next0, next1;
+ u32 sw_if_index0, sw_if_index1;
+ ip4_header_t *ip0, *ip1;
+ ip_csum_t sum0, sum1;
+ ip4_address_t new_addr0, old_addr0, new_addr1, old_addr1;
+ u16 old_port0, new_port0, lo_port0, i0;
+ u16 old_port1, new_port1, lo_port1, i1;
+ udp_header_t *udp0, *udp1;
+ tcp_header_t *tcp0, *tcp1;
+ u32 proto0, proto1;
+ snat_det_out_key_t key0, key1;
+ snat_det_map_t *mp0, *mp1;
+ snat_det_session_t *ses0 = 0, *ses1 = 0;
+ u32 rx_fib_index0, rx_fib_index1;
+ icmp46_header_t *icmp0, *icmp1;
+
+ /* Prefetch next iteration. */
+ {
+ vlib_buffer_t *p2, *p3;
+
+ p2 = vlib_get_buffer (vm, from[2]);
+ p3 = vlib_get_buffer (vm, from[3]);
+
+ 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);
+ }
+
+ /* speculatively enqueue b0 and b1 to the current next frame */
+ to_next[0] = bi0 = from[0];
+ to_next[1] = bi1 = from[1];
+ from += 2;
+ to_next += 2;
+ n_left_from -= 2;
+ n_left_to_next -= 2;
+
+ b0 = vlib_get_buffer (vm, bi0);
+ b1 = vlib_get_buffer (vm, bi1);
+
+ next0 = DET44_IN2OUT_NEXT_LOOKUP;
+ next1 = DET44_IN2OUT_NEXT_LOOKUP;
+
+ ip0 = vlib_buffer_get_current (b0);
+ udp0 = ip4_next_header (ip0);
+ tcp0 = (tcp_header_t *) udp0;
+
+ sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
+
+ 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 = DET44_IN2OUT_NEXT_ICMP_ERROR;
+ goto trace0;
+ }
+
+ proto0 = ip_proto_to_nat_proto (ip0->protocol);
+
+ if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP))
+ {
+ rx_fib_index0 =
+ ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
+ icmp0 = (icmp46_header_t *) udp0;
+
+ // TODO:
+ next0 = det44_icmp_in2out (b0, ip0, icmp0, sw_if_index0,
+ rx_fib_index0, node, next0,
+ thread_index, &ses0, &mp0);
+ goto trace0;
+ }
+
+ mp0 = snat_det_map_by_user (&ip0->src_address);
+ if (PREDICT_FALSE (!mp0))
+ {
+ det44_log_info ("no match for internal host %U",
+ format_ip4_address, &ip0->src_address);
+ next0 = DET44_IN2OUT_NEXT_DROP;
+ b0->error = node->errors[DET44_IN2OUT_ERROR_NO_TRANSLATION];
+ goto trace0;
+ }
+
+ snat_det_forward (mp0, &ip0->src_address, &new_addr0, &lo_port0);
+
+ key0.ext_host_addr = ip0->dst_address;
+ key0.ext_host_port = tcp0->dst;
+
+ ses0 =
+ snat_det_find_ses_by_in (mp0, &ip0->src_address, tcp0->src, key0);
+ if (PREDICT_FALSE (!ses0))
+ {
+ for (i0 = 0; i0 < mp0->ports_per_host; i0++)
+ {
+ key0.out_port = clib_host_to_net_u16 (lo_port0 +
+ ((i0 +
+ clib_net_to_host_u16
+ (tcp0->src)) %
+ mp0->
+ ports_per_host));
+
+ if (snat_det_get_ses_by_out
+ (mp0, &ip0->src_address, key0.as_u64))
+ continue;
+
+ ses0 =
+ snat_det_ses_create (thread_index, mp0, &ip0->src_address,
+ tcp0->src, &key0);
+ break;
+ }
+ if (PREDICT_FALSE (!ses0))
+ {
+ /* too many sessions for user, send ICMP error packet */
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
+ icmp4_error_set_vnet_buffer (b0,
+ ICMP4_destination_unreachable,
+ ICMP4_destination_unreachable_destination_unreachable_host,
+ 0);
+ next0 = DET44_IN2OUT_NEXT_ICMP_ERROR;
+ goto trace0;
+ }
+ }
+
+ old_port0 = udp0->src_port;
+ udp0->src_port = new_port0 = ses0->out.out_port;
+
+ old_addr0.as_u32 = ip0->src_address.as_u32;
+ ip0->src_address.as_u32 = new_addr0.as_u32;
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = dm->outside_fib_index;
+
+ sum0 = ip0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32,
+ ip4_header_t,
+ src_address /* changed member */ );
+ ip0->checksum = ip_csum_fold (sum0);
+
+ if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP))
+ {
+ if (tcp0->flags & TCP_FLAG_SYN)
+ ses0->state = DET44_SESSION_TCP_SYN_SENT;
+ else if (tcp0->flags & TCP_FLAG_ACK
+ && ses0->state == DET44_SESSION_TCP_SYN_SENT)
+ ses0->state = DET44_SESSION_TCP_ESTABLISHED;
+ else if (tcp0->flags & TCP_FLAG_FIN
+ && ses0->state == DET44_SESSION_TCP_ESTABLISHED)
+ ses0->state = DET44_SESSION_TCP_FIN_WAIT;
+ else if (tcp0->flags & TCP_FLAG_ACK
+ && ses0->state == DET44_SESSION_TCP_FIN_WAIT)
+ snat_det_ses_close (mp0, ses0);
+ else if (tcp0->flags & TCP_FLAG_FIN
+ && ses0->state == DET44_SESSION_TCP_CLOSE_WAIT)
+ ses0->state = DET44_SESSION_TCP_LAST_ACK;
+ else if (tcp0->flags == 0
+ && ses0->state == DET44_SESSION_UNKNOWN)
+ ses0->state = DET44_SESSION_TCP_ESTABLISHED;
+
+ sum0 = tcp0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32,
+ ip4_header_t,
+ dst_address /* changed member */ );
+ sum0 = ip_csum_update (sum0, old_port0, new_port0,
+ ip4_header_t /* cheat */ ,
+ length /* changed member */ );
+ mss_clamping (dm->mss_clamping, tcp0, &sum0);
+ tcp0->checksum = ip_csum_fold (sum0);
+ }
+ else
+ {
+ ses0->state = DET44_SESSION_UDP_ACTIVE;
+
+ if (PREDICT_FALSE (udp0->checksum))
+ {
+ sum0 = udp0->checksum;
+ sum0 =
+ ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32,
+ 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);
+ }
+ }
+
+ switch (ses0->state)
+ {
+ case DET44_SESSION_UDP_ACTIVE:
+ ses0->expire = now + dm->timeouts.udp;
+ break;
+ case DET44_SESSION_TCP_SYN_SENT:
+ case DET44_SESSION_TCP_FIN_WAIT:
+ case DET44_SESSION_TCP_CLOSE_WAIT:
+ case DET44_SESSION_TCP_LAST_ACK:
+ ses0->expire = now + dm->timeouts.tcp.transitory;
+ break;
+ case DET44_SESSION_TCP_ESTABLISHED:
+ ses0->expire = now + dm->timeouts.tcp.established;
+ break;
+ }
+
+ trace0:
+ if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
+ && (b0->flags & VLIB_BUFFER_IS_TRACED)))
+ {
+ det44_in2out_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 (ses0)
+ t->session_index = ses0 - mp0->sessions;
+ }
+
+ pkts_processed += next0 != DET44_IN2OUT_NEXT_DROP;
+
+ ip1 = vlib_buffer_get_current (b1);
+ udp1 = ip4_next_header (ip1);
+ tcp1 = (tcp_header_t *) udp1;
+
+ sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
+
+ 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 = DET44_IN2OUT_NEXT_ICMP_ERROR;
+ goto trace1;
+ }
+
+ proto1 = ip_proto_to_nat_proto (ip1->protocol);
+
+ if (PREDICT_FALSE (proto1 == NAT_PROTOCOL_ICMP))
+ {
+ rx_fib_index1 =
+ ip4_fib_table_get_index_for_sw_if_index (sw_if_index1);
+ icmp1 = (icmp46_header_t *) udp1;
+
+ next1 = det44_icmp_in2out (b1, ip1, icmp1, sw_if_index1,
+ rx_fib_index1, node, next1,
+ thread_index, &ses1, &mp1);
+ goto trace1;
+ }
+
+ mp1 = snat_det_map_by_user (&ip1->src_address);
+ if (PREDICT_FALSE (!mp1))
+ {
+ det44_log_info ("no match for internal host %U",
+ format_ip4_address, &ip0->src_address);
+ next1 = DET44_IN2OUT_NEXT_DROP;
+ b1->error = node->errors[DET44_IN2OUT_ERROR_NO_TRANSLATION];
+ goto trace1;
+ }
+
+ snat_det_forward (mp1, &ip1->src_address, &new_addr1, &lo_port1);
+
+ key1.ext_host_addr = ip1->dst_address;
+ key1.ext_host_port = tcp1->dst;
+
+ ses1 =
+ snat_det_find_ses_by_in (mp1, &ip1->src_address, tcp1->src, key1);
+ if (PREDICT_FALSE (!ses1))
+ {
+ for (i1 = 0; i1 < mp1->ports_per_host; i1++)
+ {
+ key1.out_port = clib_host_to_net_u16 (lo_port1 +
+ ((i1 +
+ clib_net_to_host_u16
+ (tcp1->src)) %
+ mp1->
+ ports_per_host));
+
+ if (snat_det_get_ses_by_out
+ (mp1, &ip1->src_address, key1.as_u64))
+ continue;
+
+ ses1 =
+ snat_det_ses_create (thread_index, mp1, &ip1->src_address,
+ tcp1->src, &key1);
+ break;
+ }
+ if (PREDICT_FALSE (!ses1))
+ {
+ /* too many sessions for user, send ICMP error packet */
+ vnet_buffer (b1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
+ icmp4_error_set_vnet_buffer (b1,
+ ICMP4_destination_unreachable,
+ ICMP4_destination_unreachable_destination_unreachable_host,
+ 0);
+ next1 = DET44_IN2OUT_NEXT_ICMP_ERROR;
+ goto trace1;
+ }
+ }
+
+ old_port1 = udp1->src_port;
+ udp1->src_port = new_port1 = ses1->out.out_port;
+
+ old_addr1.as_u32 = ip1->src_address.as_u32;
+ ip1->src_address.as_u32 = new_addr1.as_u32;
+ vnet_buffer (b1)->sw_if_index[VLIB_TX] = dm->outside_fib_index;
+
+ sum1 = ip1->checksum;
+ sum1 = ip_csum_update (sum1, old_addr1.as_u32, new_addr1.as_u32,
+ ip4_header_t,
+ src_address /* changed member */ );
+ ip1->checksum = ip_csum_fold (sum1);
+
+ if (PREDICT_TRUE (proto1 == NAT_PROTOCOL_TCP))
+ {
+ if (tcp1->flags & TCP_FLAG_SYN)
+ ses1->state = DET44_SESSION_TCP_SYN_SENT;
+ else if (tcp1->flags & TCP_FLAG_ACK
+ && ses1->state == DET44_SESSION_TCP_SYN_SENT)
+ ses1->state = DET44_SESSION_TCP_ESTABLISHED;
+ else if (tcp1->flags & TCP_FLAG_FIN
+ && ses1->state == DET44_SESSION_TCP_ESTABLISHED)
+ ses1->state = DET44_SESSION_TCP_FIN_WAIT;
+ else if (tcp1->flags & TCP_FLAG_ACK
+ && ses1->state == DET44_SESSION_TCP_FIN_WAIT)
+ snat_det_ses_close (mp1, ses1);
+ else if (tcp1->flags & TCP_FLAG_FIN
+ && ses1->state == DET44_SESSION_TCP_CLOSE_WAIT)
+ ses1->state = DET44_SESSION_TCP_LAST_ACK;
+ else if (tcp1->flags == 0
+ && ses1->state == DET44_SESSION_UNKNOWN)
+ ses1->state = DET44_SESSION_TCP_ESTABLISHED;
+
+ sum1 = tcp1->checksum;
+ sum1 = ip_csum_update (sum1, old_addr1.as_u32, new_addr1.as_u32,
+ ip4_header_t,
+ dst_address /* changed member */ );
+ sum1 = ip_csum_update (sum1, old_port1, new_port1,
+ ip4_header_t /* cheat */ ,
+ length /* changed member */ );
+ mss_clamping (dm->mss_clamping, tcp1, &sum1);
+ tcp1->checksum = ip_csum_fold (sum1);
+ }
+ else
+ {
+ ses1->state = DET44_SESSION_UDP_ACTIVE;
+
+ if (PREDICT_FALSE (udp1->checksum))
+ {
+ sum1 = udp1->checksum;
+ sum1 =
+ ip_csum_update (sum1, old_addr1.as_u32, new_addr1.as_u32,
+ 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);
+ }
+ }
+
+ switch (ses1->state)
+ {
+ case DET44_SESSION_UDP_ACTIVE:
+ ses1->expire = now + dm->timeouts.udp;
+ break;
+ case DET44_SESSION_TCP_SYN_SENT:
+ case DET44_SESSION_TCP_FIN_WAIT:
+ case DET44_SESSION_TCP_CLOSE_WAIT:
+ case DET44_SESSION_TCP_LAST_ACK:
+ ses1->expire = now + dm->timeouts.tcp.transitory;
+ break;
+ case DET44_SESSION_TCP_ESTABLISHED:
+ ses1->expire = now + dm->timeouts.tcp.established;
+ break;
+ }
+
+ trace1:
+ if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
+ && (b1->flags & VLIB_BUFFER_IS_TRACED)))
+ {
+ det44_in2out_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 (ses1)
+ t->session_index = ses1 - mp1->sessions;
+ }
+
+ pkts_processed += next1 != DET44_IN2OUT_NEXT_DROP;
+
+ /* verify speculative enqueues, maybe switch current next frame */
+ vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, bi1, next0, next1);
+ }
+
+ while (n_left_from > 0 && n_left_to_next > 0)
+ {
+ u32 bi0;
+ vlib_buffer_t *b0;
+ u32 next0;
+ u32 sw_if_index0;
+ ip4_header_t *ip0;
+ ip_csum_t sum0;
+ ip4_address_t new_addr0, old_addr0;
+ u16 old_port0, new_port0, lo_port0, i0;
+ udp_header_t *udp0;
+ tcp_header_t *tcp0;
+ u32 proto0;
+ snat_det_out_key_t key0;
+ snat_det_map_t *mp0;
+ snat_det_session_t *ses0 = 0;
+ u32 rx_fib_index0;
+ icmp46_header_t *icmp0;
+
+ /* 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);
+ next0 = DET44_IN2OUT_NEXT_LOOKUP;
+
+ ip0 = vlib_buffer_get_current (b0);
+ udp0 = ip4_next_header (ip0);
+ tcp0 = (tcp_header_t *) udp0;
+
+ sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
+
+ 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 = DET44_IN2OUT_NEXT_ICMP_ERROR;
+ goto trace00;
+ }
+
+ proto0 = ip_proto_to_nat_proto (ip0->protocol);
+
+ if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP))
+ {
+ rx_fib_index0 =
+ ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
+ icmp0 = (icmp46_header_t *) udp0;
+
+ next0 = det44_icmp_in2out (b0, ip0, icmp0, sw_if_index0,
+ rx_fib_index0, node, next0,
+ thread_index, &ses0, &mp0);
+ goto trace00;
+ }
+
+ mp0 = snat_det_map_by_user (&ip0->src_address);
+ if (PREDICT_FALSE (!mp0))
+ {
+ det44_log_info ("no match for internal host %U",
+ format_ip4_address, &ip0->src_address);
+ next0 = DET44_IN2OUT_NEXT_DROP;
+ b0->error = node->errors[DET44_IN2OUT_ERROR_NO_TRANSLATION];
+ goto trace00;
+ }
+
+ snat_det_forward (mp0, &ip0->src_address, &new_addr0, &lo_port0);
+
+ key0.ext_host_addr = ip0->dst_address;
+ key0.ext_host_port = tcp0->dst;
+
+ ses0 =
+ snat_det_find_ses_by_in (mp0, &ip0->src_address, tcp0->src, key0);
+ if (PREDICT_FALSE (!ses0))
+ {
+ for (i0 = 0; i0 < mp0->ports_per_host; i0++)
+ {
+ key0.out_port = clib_host_to_net_u16 (lo_port0 +
+ ((i0 +
+ clib_net_to_host_u16
+ (tcp0->src)) %
+ mp0->
+ ports_per_host));
+
+ if (snat_det_get_ses_by_out
+ (mp0, &ip0->src_address, key0.as_u64))
+ continue;
+
+ ses0 =
+ snat_det_ses_create (thread_index, mp0, &ip0->src_address,
+ tcp0->src, &key0);
+ break;
+ }
+ if (PREDICT_FALSE (!ses0))
+ {
+ /* too many sessions for user, send ICMP error packet */
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
+ icmp4_error_set_vnet_buffer (b0,
+ ICMP4_destination_unreachable,
+ ICMP4_destination_unreachable_destination_unreachable_host,
+ 0);
+ next0 = DET44_IN2OUT_NEXT_ICMP_ERROR;
+ goto trace00;
+ }
+ }
+
+ old_port0 = udp0->src_port;
+ udp0->src_port = new_port0 = ses0->out.out_port;
+
+ old_addr0.as_u32 = ip0->src_address.as_u32;
+ ip0->src_address.as_u32 = new_addr0.as_u32;
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = dm->outside_fib_index;
+
+ sum0 = ip0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32,
+ ip4_header_t,
+ src_address /* changed member */ );
+ ip0->checksum = ip_csum_fold (sum0);
+
+ if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP))
+ {
+ if (tcp0->flags & TCP_FLAG_SYN)
+ ses0->state = DET44_SESSION_TCP_SYN_SENT;
+ else if (tcp0->flags & TCP_FLAG_ACK
+ && ses0->state == DET44_SESSION_TCP_SYN_SENT)
+ ses0->state = DET44_SESSION_TCP_ESTABLISHED;
+ else if (tcp0->flags & TCP_FLAG_FIN
+ && ses0->state == DET44_SESSION_TCP_ESTABLISHED)
+ ses0->state = DET44_SESSION_TCP_FIN_WAIT;
+ else if (tcp0->flags & TCP_FLAG_ACK
+ && ses0->state == DET44_SESSION_TCP_FIN_WAIT)
+ snat_det_ses_close (mp0, ses0);
+ else if (tcp0->flags & TCP_FLAG_FIN
+ && ses0->state == DET44_SESSION_TCP_CLOSE_WAIT)
+ ses0->state = DET44_SESSION_TCP_LAST_ACK;
+ else if (tcp0->flags == 0
+ && ses0->state == DET44_SESSION_UNKNOWN)
+ ses0->state = DET44_SESSION_TCP_ESTABLISHED;
+
+ sum0 = tcp0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32,
+ ip4_header_t,
+ dst_address /* changed member */ );
+ sum0 = ip_csum_update (sum0, old_port0, new_port0,
+ ip4_header_t /* cheat */ ,
+ length /* changed member */ );
+ mss_clamping (dm->mss_clamping, tcp0, &sum0);
+ tcp0->checksum = ip_csum_fold (sum0);
+ }
+ else
+ {
+ ses0->state = DET44_SESSION_UDP_ACTIVE;
+
+ if (PREDICT_FALSE (udp0->checksum))
+ {
+ sum0 = udp0->checksum;
+ sum0 =
+ ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32,
+ 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);
+ }
+ }
+
+ switch (ses0->state)
+ {
+ case DET44_SESSION_UDP_ACTIVE:
+ ses0->expire = now + dm->timeouts.udp;
+ break;
+ case DET44_SESSION_TCP_SYN_SENT:
+ case DET44_SESSION_TCP_FIN_WAIT:
+ case DET44_SESSION_TCP_CLOSE_WAIT:
+ case DET44_SESSION_TCP_LAST_ACK:
+ ses0->expire = now + dm->timeouts.tcp.transitory;
+ break;
+ case DET44_SESSION_TCP_ESTABLISHED:
+ ses0->expire = now + dm->timeouts.tcp.established;
+ break;
+ }
+
+ trace00:
+ if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
+ && (b0->flags & VLIB_BUFFER_IS_TRACED)))
+ {
+ det44_in2out_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 (ses0)
+ t->session_index = ses0 - mp0->sessions;
+ }
+
+ pkts_processed += next0 != DET44_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, dm->in2out_node_index,
+ DET44_IN2OUT_ERROR_IN2OUT_PACKETS,
+ pkts_processed);
+ return frame->n_vectors;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (det44_in2out_node) = {
+ .name = "det44-in2out",
+ .vector_size = sizeof (u32),
+ .format_trace = format_det44_in2out_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+ .n_errors = ARRAY_LEN(det44_in2out_error_strings),
+ .error_strings = det44_in2out_error_strings,
+ .runtime_data_bytes = sizeof (det44_runtime_t),
+ .n_next_nodes = DET44_IN2OUT_N_NEXT,
+ /* edit / add dispositions here */
+ .next_nodes = {
+ [DET44_IN2OUT_NEXT_DROP] = "error-drop",
+ [DET44_IN2OUT_NEXT_LOOKUP] = "ip4-lookup",
+ [DET44_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
+ },
+};
+/* *INDENT-ON* */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */