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-rw-r--r--plugins/snat-plugin/snat/out2in.c601
1 files changed, 601 insertions, 0 deletions
diff --git a/plugins/snat-plugin/snat/out2in.c b/plugins/snat-plugin/snat/out2in.c
new file mode 100644
index 00000000000..0fa96c97f83
--- /dev/null
+++ b/plugins/snat-plugin/snat/out2in.c
@@ -0,0 +1,601 @@
+/*
+ * 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.
+ */
+
+#include <vlib/vlib.h>
+#include <vnet/vnet.h>
+#include <vnet/pg/pg.h>
+
+#include <vnet/ip/ip.h>
+#include <vnet/ethernet/ethernet.h>
+#include <snat/snat.h>
+
+#include <vppinfra/hash.h>
+#include <vppinfra/error.h>
+#include <vppinfra/elog.h>
+
+vlib_node_registration_t snat_out2in_node;
+
+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, "SNAT_OUT2IN: sw_if_index %d, next index %d, session index %d",
+ t->sw_if_index, t->next_index, t->session_index);
+ return s;
+}
+
+vlib_node_registration_t snat_out2in_node;
+
+#define foreach_snat_out2in_error \
+_(UNSUPPORTED_PROTOCOL, "Unsupported protocol") \
+_(OUT2IN_PACKETS, "Good out2in packets processed") \
+_(BAD_ICMP_TYPE, "icmp type not echo-reply") \
+_(NO_TRANSLATION, "No translation")
+
+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_N_NEXT,
+} snat_out2in_next_t;
+
+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)
+{
+ snat_session_key_t key0;
+ icmp_echo_header_t *echo0;
+ clib_bihash_kv_8_8_t kv0, value0;
+ snat_session_t * s0;
+ u32 new_addr0, old_addr0;
+ u16 old_id0, new_id0;
+ ip_csum_t sum0;
+ snat_runtime_t * rt = (snat_runtime_t *)node->runtime_data;
+
+ echo0 = (icmp_echo_header_t *)(icmp0+1);
+
+ key0.addr = ip0->dst_address;
+ key0.port = echo0->identifier;
+ key0.protocol = SNAT_PROTOCOL_ICMP;
+ key0.fib_index = rx_fib_index0;
+
+ kv0.key = key0.as_u64;
+
+ if (clib_bihash_search_8_8 (&sm->out2in, &kv0, &value0))
+ {
+ ip4_address_t * first_int_addr;
+
+ if (PREDICT_FALSE(rt->cached_sw_if_index != sw_if_index0))
+ {
+ first_int_addr =
+ ip4_interface_first_address (sm->ip4_main, sw_if_index0,
+ 0 /* just want the address */);
+ rt->cached_sw_if_index = sw_if_index0;
+ rt->cached_ip4_address = first_int_addr->as_u32;
+ }
+
+ /* Don't NAT packet aimed at the intfc address */
+ if (PREDICT_FALSE(ip0->dst_address.as_u32 ==
+ rt->cached_ip4_address))
+ return next0;
+
+ b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
+ return SNAT_OUT2IN_NEXT_DROP;
+ }
+ else
+ s0 = pool_elt_at_index (sm->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);
+
+ old_id0 = echo0->identifier;
+ new_id0 = s0->in2out.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);
+
+ /* Accounting, per-user LRU list maintenance */
+ s0->last_heard = now;
+ s0->total_pkts++;
+ s0->total_bytes += vlib_buffer_length_in_chain (sm->vlib_main, b0);
+ clib_dlist_remove (sm->list_pool, s0->per_user_index);
+ clib_dlist_addtail (sm->list_pool, s0->per_user_list_head_index,
+ s0->per_user_index);
+
+ return next0;
+}
+
+static uword
+snat_out2in_node_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ u32 n_left_from, * from, * to_next;
+ snat_out2in_next_t next_index;
+ u32 pkts_processed = 0;
+ snat_main_t * sm = &snat_main;
+ ip_lookup_main_t * lm = sm->ip4_lookup_main;
+ ip_config_main_t * cm = &lm->rx_config_mains[VNET_UNICAST];
+ f64 now = vlib_time_now (vm);
+
+ 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 = SNAT_OUT2IN_NEXT_DROP;
+ u32 next1 = SNAT_OUT2IN_NEXT_DROP;
+ 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;
+ snat_session_key_t key0, key1;
+ 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;
+
+ /* 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, STORE);
+ CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
+ }
+
+ /* 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);
+
+ 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);
+
+ vnet_get_config_data (&cm->config_main,
+ &b0->current_config_index,
+ &next0,
+ 0 /* sizeof config data */);
+ proto0 = ~0;
+ proto0 = (ip0->protocol == IP_PROTOCOL_UDP)
+ ? SNAT_PROTOCOL_UDP : proto0;
+ proto0 = (ip0->protocol == IP_PROTOCOL_TCP)
+ ? SNAT_PROTOCOL_TCP : proto0;
+ proto0 = (ip0->protocol == IP_PROTOCOL_ICMP)
+ ? SNAT_PROTOCOL_ICMP : proto0;
+
+ if (PREDICT_FALSE (proto0 == ~0))
+ goto trace0;
+
+ if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
+ {
+ next0 = icmp_out2in_slow_path
+ (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
+ next0, now);
+ goto trace0;
+ }
+
+ key0.addr = ip0->dst_address;
+ key0.port = udp0->dst_port;
+ key0.protocol = proto0;
+ key0.fib_index = rx_fib_index0;
+
+ kv0.key = key0.as_u64;
+
+ if (clib_bihash_search_8_8 (&sm->out2in, &kv0, &value0))
+ goto trace0;
+ else
+ s0 = pool_elt_at_index (sm->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->out2in.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 == SNAT_PROTOCOL_TCP))
+ {
+ old_port0 = tcp0->ports.dst;
+ tcp0->ports.dst = s0->in2out.port;
+ new_port0 = tcp0->ports.dst;
+
+ 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
+ {
+ old_port0 = udp0->dst_port;
+ udp0->dst_port = s0->in2out.port;
+ udp0->checksum = 0;
+ }
+
+ /* Accounting, per-user LRU list maintenance */
+ s0->last_heard = now;
+ s0->total_pkts++;
+ s0->total_bytes += vlib_buffer_length_in_chain (vm, b0);
+ clib_dlist_remove (sm->list_pool, s0->per_user_index);
+ clib_dlist_addtail (sm->list_pool, s0->per_user_list_head_index,
+ s0->per_user_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->sessions;
+ }
+
+ pkts_processed += next0 != SNAT_OUT2IN_NEXT_DROP;
+
+
+ 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);
+
+ vnet_get_config_data (&cm->config_main,
+ &b1->current_config_index,
+ &next1,
+ 0 /* sizeof config data */);
+ proto1 = ~0;
+ proto1 = (ip1->protocol == IP_PROTOCOL_UDP)
+ ? SNAT_PROTOCOL_UDP : proto1;
+ proto1 = (ip1->protocol == IP_PROTOCOL_TCP)
+ ? SNAT_PROTOCOL_TCP : proto1;
+ proto1 = (ip1->protocol == IP_PROTOCOL_ICMP)
+ ? SNAT_PROTOCOL_ICMP : proto1;
+
+ if (PREDICT_FALSE (proto1 == ~0))
+ goto trace1;
+
+ if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP))
+ {
+ next1 = icmp_out2in_slow_path
+ (sm, b1, ip1, icmp1, sw_if_index1, rx_fib_index1, node,
+ next1, now);
+ goto trace1;
+ }
+
+ key1.addr = ip1->dst_address;
+ key1.port = udp1->dst_port;
+ key1.protocol = proto1;
+ key1.fib_index = rx_fib_index1;
+
+ kv1.key = key1.as_u64;
+
+ if (clib_bihash_search_8_8 (&sm->out2in, &kv1, &value1))
+ goto trace1;
+ else
+ s1 = pool_elt_at_index (sm->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->out2in.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 == SNAT_PROTOCOL_TCP))
+ {
+ old_port1 = tcp1->ports.dst;
+ tcp1->ports.dst = s1->in2out.port;
+ new_port1 = tcp1->ports.dst;
+
+ 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);
+ }
+ else
+ {
+ old_port1 = udp1->dst_port;
+ udp1->dst_port = s1->in2out.port;
+ udp1->checksum = 0;
+ }
+
+ /* Accounting, per-user LRU list maintenance */
+ s1->last_heard = now;
+ s1->total_pkts++;
+ s1->total_bytes += vlib_buffer_length_in_chain (vm, b1);
+ clib_dlist_remove (sm->list_pool, s1->per_user_index);
+ clib_dlist_addtail (sm->list_pool, s1->per_user_list_head_index,
+ s1->per_user_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->sessions;
+ }
+
+ pkts_processed += next0 != SNAT_OUT2IN_NEXT_DROP;
+ pkts_processed += next1 != SNAT_OUT2IN_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 = 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;
+ snat_session_key_t key0;
+ u32 rx_fib_index0;
+ u32 proto0;
+ snat_session_t * s0 = 0;
+ clib_bihash_kv_8_8_t kv0, value0;
+
+ /* 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);
+
+ 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);
+
+ vnet_get_config_data (&cm->config_main,
+ &b0->current_config_index,
+ &next0,
+ 0 /* sizeof config data */);
+ proto0 = ~0;
+ proto0 = (ip0->protocol == IP_PROTOCOL_UDP)
+ ? SNAT_PROTOCOL_UDP : proto0;
+ proto0 = (ip0->protocol == IP_PROTOCOL_TCP)
+ ? SNAT_PROTOCOL_TCP : proto0;
+ proto0 = (ip0->protocol == IP_PROTOCOL_ICMP)
+ ? SNAT_PROTOCOL_ICMP : proto0;
+
+ if (PREDICT_FALSE (proto0 == ~0))
+ goto trace00;
+
+ if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
+ {
+ next0 = icmp_out2in_slow_path
+ (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
+ next0, now);
+ goto trace00;
+ }
+
+ key0.addr = ip0->dst_address;
+ key0.port = udp0->dst_port;
+ key0.protocol = proto0;
+ key0.fib_index = rx_fib_index0;
+
+ kv0.key = key0.as_u64;
+
+ if (clib_bihash_search_8_8 (&sm->out2in, &kv0, &value0))
+ goto trace00;
+ else
+ s0 = pool_elt_at_index (sm->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->out2in.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 == SNAT_PROTOCOL_TCP))
+ {
+ old_port0 = tcp0->ports.dst;
+ tcp0->ports.dst = s0->in2out.port;
+ new_port0 = tcp0->ports.dst;
+
+ 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
+ {
+ old_port0 = udp0->dst_port;
+ udp0->dst_port = s0->in2out.port;
+ udp0->checksum = 0;
+ }
+
+ /* Accounting, per-user LRU list maintenance */
+ s0->last_heard = now;
+ s0->total_pkts++;
+ s0->total_bytes += vlib_buffer_length_in_chain (vm, b0);
+ clib_dlist_remove (sm->list_pool, s0->per_user_index);
+ clib_dlist_addtail (sm->list_pool, s0->per_user_list_head_index,
+ s0->per_user_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->sessions;
+ }
+
+ pkts_processed += next0 != SNAT_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, snat_out2in_node.index,
+ SNAT_OUT2IN_ERROR_OUT2IN_PACKETS,
+ pkts_processed);
+ return frame->n_vectors;
+}
+
+VLIB_REGISTER_NODE (snat_out2in_node) = {
+ .function = snat_out2in_node_fn,
+ .name = "snat-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",
+ },
+};
+VLIB_NODE_FUNCTION_MULTIARCH (snat_out2in_node, snat_out2in_node_fn);