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-rw-r--r--src/plugins/nat/nat44_hairpinning.c934
1 files changed, 934 insertions, 0 deletions
diff --git a/src/plugins/nat/nat44_hairpinning.c b/src/plugins/nat/nat44_hairpinning.c
new file mode 100644
index 00000000000..9d49dc2300e
--- /dev/null
+++ b/src/plugins/nat/nat44_hairpinning.c
@@ -0,0 +1,934 @@
+/*
+ * Copyright (c) 2018 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 hairpinning
+ */
+
+#include <vlib/vlib.h>
+#include <vnet/vnet.h>
+#include <vnet/fib/ip4_fib.h>
+#include <nat/nat.h>
+#include <nat/nat_inlines.h>
+#include <nat/nat_reass.h>
+
+typedef enum
+{
+ SNAT_HAIRPIN_SRC_NEXT_DROP,
+ SNAT_HAIRPIN_SRC_NEXT_SNAT_IN2OUT,
+ SNAT_HAIRPIN_SRC_NEXT_SNAT_IN2OUT_WH,
+ SNAT_HAIRPIN_SRC_NEXT_INTERFACE_OUTPUT,
+ SNAT_HAIRPIN_SRC_N_NEXT,
+} snat_hairpin_src_next_t;
+
+typedef enum
+{
+ NAT_HAIRPIN_NEXT_LOOKUP,
+ NAT_HAIRPIN_NEXT_DROP,
+ NAT_HAIRPIN_N_NEXT,
+} nat_hairpin_next_t;
+
+#define foreach_nat44_hairpin_error \
+_(PROCESSED, "NAT44 hairpinning packets processed")
+
+typedef enum
+{
+#define _(sym,str) NAT44_HAIRPIN_ERROR_##sym,
+ foreach_nat44_hairpin_error
+#undef _
+ NAT44_HAIRPIN_N_ERROR,
+} nat44_hairpin_error_t;
+
+static char *nat44_hairpin_error_strings[] = {
+#define _(sym,string) string,
+ foreach_nat44_hairpin_error
+#undef _
+};
+
+vlib_node_registration_t snat_hairpin_dst_node;
+vlib_node_registration_t snat_hairpin_src_node;
+vlib_node_registration_t nat44_hairpinning_node;
+vlib_node_registration_t nat44_ed_hairpin_dst_node;
+vlib_node_registration_t nat44_ed_hairpin_src_node;
+vlib_node_registration_t nat44_ed_hairpinning_node;
+
+extern vnet_feature_arc_registration_t vnet_feat_arc_ip4_local;
+
+static_always_inline int
+is_hairpinning (snat_main_t * sm, ip4_address_t * dst_addr)
+{
+ snat_address_t *ap;
+ clib_bihash_kv_8_8_t kv, value;
+ snat_session_key_t m_key;
+
+ /* *INDENT-OFF* */
+ vec_foreach (ap, sm->addresses)
+ {
+ if (ap->addr.as_u32 == dst_addr->as_u32)
+ return 1;
+ }
+ /* *INDENT-ON* */
+
+ m_key.addr.as_u32 = dst_addr->as_u32;
+ m_key.fib_index = 0;
+ m_key.port = 0;
+ m_key.protocol = 0;
+ kv.key = m_key.as_u64;
+ if (!clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value))
+ return 1;
+
+ return 0;
+}
+
+int
+snat_hairpinning (snat_main_t * sm,
+ vlib_buffer_t * b0,
+ ip4_header_t * ip0,
+ udp_header_t * udp0,
+ tcp_header_t * tcp0, u32 proto0, int is_ed)
+{
+ snat_session_key_t key0, sm0;
+ snat_session_t *s0;
+ clib_bihash_kv_8_8_t kv0, value0;
+ ip_csum_t sum0;
+ u32 new_dst_addr0 = 0, old_dst_addr0, ti = 0, si;
+ u16 new_dst_port0, old_dst_port0;
+ int rv;
+
+ key0.addr = ip0->dst_address;
+ key0.port = udp0->dst_port;
+ key0.protocol = proto0;
+ key0.fib_index = sm->outside_fib_index;
+ kv0.key = key0.as_u64;
+
+ /* Check if destination is static mappings */
+ if (!snat_static_mapping_match (sm, key0, &sm0, 1, 0, 0, 0, 0))
+ {
+ new_dst_addr0 = sm0.addr.as_u32;
+ new_dst_port0 = sm0.port;
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = sm0.fib_index;
+ }
+ /* or active session */
+ else
+ {
+ if (sm->num_workers > 1)
+ ti =
+ (clib_net_to_host_u16 (udp0->dst_port) -
+ 1024) / sm->port_per_thread;
+ else
+ ti = sm->num_workers;
+
+ if (is_ed)
+ {
+ clib_bihash_kv_16_8_t ed_kv, ed_value;
+ make_ed_kv (&ed_kv, &ip0->dst_address, &ip0->src_address,
+ ip0->protocol, sm->outside_fib_index, udp0->dst_port,
+ udp0->src_port);
+ rv = clib_bihash_search_16_8 (&sm->per_thread_data[ti].out2in_ed,
+ &ed_kv, &ed_value);
+ si = ed_value.value;
+ }
+ else
+ {
+ rv = clib_bihash_search_8_8 (&sm->per_thread_data[ti].out2in, &kv0,
+ &value0);
+ si = value0.value;
+ }
+ if (rv)
+ return 0;
+
+ s0 = pool_elt_at_index (sm->per_thread_data[ti].sessions, si);
+ new_dst_addr0 = s0->in2out.addr.as_u32;
+ new_dst_port0 = s0->in2out.port;
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->in2out.fib_index;
+ }
+
+ /* Destination is behind the same NAT, use internal address and port */
+ if (new_dst_addr0)
+ {
+ old_dst_addr0 = ip0->dst_address.as_u32;
+ ip0->dst_address.as_u32 = new_dst_addr0;
+ sum0 = ip0->checksum;
+ sum0 = ip_csum_update (sum0, old_dst_addr0, new_dst_addr0,
+ ip4_header_t, dst_address);
+ ip0->checksum = ip_csum_fold (sum0);
+
+ old_dst_port0 = tcp0->dst;
+ if (PREDICT_TRUE (new_dst_port0 != old_dst_port0))
+ {
+ if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
+ {
+ tcp0->dst = new_dst_port0;
+ sum0 = tcp0->checksum;
+ sum0 = ip_csum_update (sum0, old_dst_addr0, new_dst_addr0,
+ ip4_header_t, dst_address);
+ sum0 = ip_csum_update (sum0, old_dst_port0, new_dst_port0,
+ ip4_header_t /* cheat */ , length);
+ tcp0->checksum = ip_csum_fold (sum0);
+ }
+ else
+ {
+ udp0->dst_port = new_dst_port0;
+ udp0->checksum = 0;
+ }
+ }
+ else
+ {
+ if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
+ {
+ sum0 = tcp0->checksum;
+ sum0 = ip_csum_update (sum0, old_dst_addr0, new_dst_addr0,
+ ip4_header_t, dst_address);
+ tcp0->checksum = ip_csum_fold (sum0);
+ }
+ }
+ return 1;
+ }
+ return 0;
+}
+
+u32
+snat_icmp_hairpinning (snat_main_t * sm,
+ vlib_buffer_t * b0,
+ ip4_header_t * ip0, icmp46_header_t * icmp0, int is_ed)
+{
+ snat_session_key_t key0;
+ clib_bihash_kv_8_8_t kv0, value0;
+ u32 old_dst_addr0, new_dst_addr0;
+ u32 old_addr0, new_addr0;
+ u16 old_port0, new_port0;
+ u16 old_checksum0, new_checksum0;
+ u32 si, ti = 0;
+ ip_csum_t sum0;
+ snat_session_t *s0;
+ snat_static_mapping_t *m0;
+
+ if (icmp_is_error_message (icmp0))
+ {
+ ip4_header_t *inner_ip0 = 0;
+ tcp_udp_header_t *l4_header = 0;
+
+ inner_ip0 = (ip4_header_t *) ((icmp_echo_header_t *) (icmp0 + 1) + 1);
+ l4_header = ip4_next_header (inner_ip0);
+ u32 protocol = ip_proto_to_snat_proto (inner_ip0->protocol);
+
+ if (protocol != SNAT_PROTOCOL_TCP && protocol != SNAT_PROTOCOL_UDP)
+ return 1;
+
+ if (is_ed)
+ {
+ clib_bihash_kv_16_8_t ed_kv, ed_value;
+ make_ed_kv (&ed_kv, &ip0->dst_address, &ip0->src_address,
+ inner_ip0->protocol, sm->outside_fib_index,
+ l4_header->src_port, l4_header->dst_port);
+ if (clib_bihash_search_16_8 (&sm->per_thread_data[ti].out2in_ed,
+ &ed_kv, &ed_value))
+ return 1;
+ si = ed_value.value;
+ }
+ else
+ {
+ key0.addr = ip0->dst_address;
+ key0.port = l4_header->src_port;
+ key0.protocol = protocol;
+ key0.fib_index = sm->outside_fib_index;
+ kv0.key = key0.as_u64;
+ if (clib_bihash_search_8_8 (&sm->per_thread_data[ti].out2in, &kv0,
+ &value0))
+ return 1;
+ si = value0.value;
+ }
+ s0 = pool_elt_at_index (sm->per_thread_data[ti].sessions, si);
+ new_dst_addr0 = s0->in2out.addr.as_u32;
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->in2out.fib_index;
+
+ /* update inner source IP address */
+ old_addr0 = inner_ip0->src_address.as_u32;
+ inner_ip0->src_address.as_u32 = new_dst_addr0;
+ 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);
+ 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,
+ src_address);
+ 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);
+
+ /* update inner source port */
+ old_port0 = l4_header->src_port;
+ l4_header->src_port = s0->in2out.port;
+ new_port0 = l4_header->src_port;
+ sum0 = icmp0->checksum;
+ sum0 = ip_csum_update (sum0, old_port0, new_port0, tcp_udp_header_t,
+ src_port);
+ icmp0->checksum = ip_csum_fold (sum0);
+ }
+ else
+ {
+ if (!is_ed)
+ {
+ icmp_echo_header_t *echo0 = (icmp_echo_header_t *) (icmp0 + 1);
+ u16 icmp_id0 = echo0->identifier;
+ key0.addr = ip0->dst_address;
+ key0.port = icmp_id0;
+ key0.protocol = SNAT_PROTOCOL_ICMP;
+ key0.fib_index = sm->outside_fib_index;
+ kv0.key = key0.as_u64;
+ if (sm->num_workers > 1)
+ ti =
+ (clib_net_to_host_u16 (icmp_id0) - 1024) / sm->port_per_thread;
+ else
+ ti = sm->num_workers;
+ int rv =
+ clib_bihash_search_8_8 (&sm->per_thread_data[ti].out2in, &kv0,
+ &value0);
+ if (!rv)
+ {
+ si = value0.value;
+ s0 = pool_elt_at_index (sm->per_thread_data[ti].sessions, si);
+ new_dst_addr0 = s0->in2out.addr.as_u32;
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->in2out.fib_index;
+ echo0->identifier = s0->in2out.port;
+ sum0 = icmp0->checksum;
+ sum0 = ip_csum_update (sum0, icmp_id0, s0->in2out.port,
+ icmp_echo_header_t, identifier);
+ icmp0->checksum = ip_csum_fold (sum0);
+ goto change_addr;
+ }
+ ti = 0;
+ }
+
+ key0.addr = ip0->dst_address;
+ key0.port = 0;
+ key0.protocol = 0;
+ key0.fib_index = sm->outside_fib_index;
+ kv0.key = key0.as_u64;
+
+ if (clib_bihash_search_8_8
+ (&sm->static_mapping_by_external, &kv0, &value0))
+ return 1;
+
+ m0 = pool_elt_at_index (sm->static_mappings, value0.value);
+
+ new_dst_addr0 = m0->local_addr.as_u32;
+ if (vnet_buffer (b0)->sw_if_index[VLIB_TX] == ~0)
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = m0->fib_index;
+ }
+change_addr:
+ /* Destination is behind the same NAT, use internal address and port */
+ if (new_dst_addr0)
+ {
+ old_dst_addr0 = ip0->dst_address.as_u32;
+ ip0->dst_address.as_u32 = new_dst_addr0;
+ sum0 = ip0->checksum;
+ sum0 = ip_csum_update (sum0, old_dst_addr0, new_dst_addr0,
+ ip4_header_t, dst_address);
+ ip0->checksum = ip_csum_fold (sum0);
+ }
+ return 0;
+}
+
+void
+nat_hairpinning_sm_unknown_proto (snat_main_t * sm,
+ vlib_buffer_t * b, ip4_header_t * ip)
+{
+ clib_bihash_kv_8_8_t kv, value;
+ snat_static_mapping_t *m;
+ u32 old_addr, new_addr;
+ ip_csum_t sum;
+
+ make_sm_kv (&kv, &ip->dst_address, 0, 0, 0);
+ if (clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value))
+ return;
+
+ 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);
+
+ if (vnet_buffer (b)->sw_if_index[VLIB_TX] == ~0)
+ vnet_buffer (b)->sw_if_index[VLIB_TX] = m->fib_index;
+}
+
+void
+nat44_ed_hairpinning_unknown_proto (snat_main_t * sm,
+ vlib_buffer_t * b, ip4_header_t * ip)
+{
+ u32 old_addr, new_addr = 0, ti = 0;
+ clib_bihash_kv_8_8_t kv, value;
+ clib_bihash_kv_16_8_t s_kv, s_value;
+ snat_static_mapping_t *m;
+ ip_csum_t sum;
+ snat_session_t *s;
+ snat_main_per_thread_data_t *tsm;
+
+ if (sm->num_workers > 1)
+ ti = sm->worker_out2in_cb (ip, sm->outside_fib_index);
+ else
+ ti = sm->num_workers;
+ tsm = &sm->per_thread_data[ti];
+
+ old_addr = ip->dst_address.as_u32;
+ make_ed_kv (&s_kv, &ip->dst_address, &ip->src_address, ip->protocol,
+ sm->outside_fib_index, 0, 0);
+ if (clib_bihash_search_16_8 (&tsm->out2in_ed, &s_kv, &s_value))
+ {
+ make_sm_kv (&kv, &ip->dst_address, 0, 0, 0);
+ if (clib_bihash_search_8_8
+ (&sm->static_mapping_by_external, &kv, &value))
+ return;
+
+ m = pool_elt_at_index (sm->static_mappings, value.value);
+ if (vnet_buffer (b)->sw_if_index[VLIB_TX] == ~0)
+ vnet_buffer (b)->sw_if_index[VLIB_TX] = m->fib_index;
+ new_addr = ip->dst_address.as_u32 = m->local_addr.as_u32;
+ }
+ else
+ {
+ s = pool_elt_at_index (sm->per_thread_data[ti].sessions, s_value.value);
+ if (vnet_buffer (b)->sw_if_index[VLIB_TX] == ~0)
+ vnet_buffer (b)->sw_if_index[VLIB_TX] = s->in2out.fib_index;
+ new_addr = ip->dst_address.as_u32 = s->in2out.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);
+}
+
+void
+nat44_reass_hairpinning (snat_main_t * sm,
+ vlib_buffer_t * b0,
+ ip4_header_t * ip0,
+ u16 sport, u16 dport, u32 proto0, int is_ed)
+{
+ snat_session_key_t key0, sm0;
+ snat_session_t *s0;
+ clib_bihash_kv_8_8_t kv0, value0;
+ ip_csum_t sum0;
+ u32 new_dst_addr0 = 0, old_dst_addr0, ti = 0, si;
+ u16 new_dst_port0, old_dst_port0;
+ udp_header_t *udp0;
+ tcp_header_t *tcp0;
+ int rv;
+
+ key0.addr = ip0->dst_address;
+ key0.port = dport;
+ key0.protocol = proto0;
+ key0.fib_index = sm->outside_fib_index;
+ kv0.key = key0.as_u64;
+
+ udp0 = ip4_next_header (ip0);
+
+ /* Check if destination is static mappings */
+ if (!snat_static_mapping_match (sm, key0, &sm0, 1, 0, 0, 0, 0))
+ {
+ new_dst_addr0 = sm0.addr.as_u32;
+ new_dst_port0 = sm0.port;
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = sm0.fib_index;
+ }
+ /* or active sessions */
+ else
+ {
+ if (sm->num_workers > 1)
+ ti =
+ (clib_net_to_host_u16 (udp0->dst_port) -
+ 1024) / sm->port_per_thread;
+ else
+ ti = sm->num_workers;
+
+ if (is_ed)
+ {
+ clib_bihash_kv_16_8_t ed_kv, ed_value;
+ make_ed_kv (&ed_kv, &ip0->dst_address, &ip0->src_address,
+ ip0->protocol, sm->outside_fib_index, udp0->dst_port,
+ udp0->src_port);
+ rv = clib_bihash_search_16_8 (&sm->per_thread_data[ti].out2in_ed,
+ &ed_kv, &ed_value);
+ si = ed_value.value;
+ }
+ else
+ {
+ rv = clib_bihash_search_8_8 (&sm->per_thread_data[ti].out2in, &kv0,
+ &value0);
+ si = value0.value;
+ }
+ if (!rv)
+ {
+ s0 = pool_elt_at_index (sm->per_thread_data[ti].sessions, si);
+ new_dst_addr0 = s0->in2out.addr.as_u32;
+ new_dst_port0 = s0->in2out.port;
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->in2out.fib_index;
+ }
+ }
+
+ /* Destination is behind the same NAT, use internal address and port */
+ if (new_dst_addr0)
+ {
+ old_dst_addr0 = ip0->dst_address.as_u32;
+ ip0->dst_address.as_u32 = new_dst_addr0;
+ sum0 = ip0->checksum;
+ sum0 = ip_csum_update (sum0, old_dst_addr0, new_dst_addr0,
+ ip4_header_t, dst_address);
+ ip0->checksum = ip_csum_fold (sum0);
+
+ old_dst_port0 = dport;
+ if (PREDICT_TRUE (new_dst_port0 != old_dst_port0 &&
+ ip4_is_first_fragment (ip0)))
+ {
+ if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
+ {
+ tcp0 = ip4_next_header (ip0);
+ tcp0->dst = new_dst_port0;
+ sum0 = tcp0->checksum;
+ sum0 = ip_csum_update (sum0, old_dst_addr0, new_dst_addr0,
+ ip4_header_t, dst_address);
+ sum0 = ip_csum_update (sum0, old_dst_port0, new_dst_port0,
+ ip4_header_t /* cheat */ , length);
+ tcp0->checksum = ip_csum_fold (sum0);
+ }
+ else
+ {
+ udp0->dst_port = new_dst_port0;
+ udp0->checksum = 0;
+ }
+ }
+ else
+ {
+ if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
+ {
+ tcp0 = ip4_next_header (ip0);
+ sum0 = tcp0->checksum;
+ sum0 = ip_csum_update (sum0, old_dst_addr0, new_dst_addr0,
+ ip4_header_t, dst_address);
+ tcp0->checksum = ip_csum_fold (sum0);
+ }
+ }
+ }
+}
+
+static inline uword
+nat44_hairpinning_fn_inline (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame, int is_ed)
+{
+ u32 n_left_from, *from, *to_next, stats_node_index;
+ nat_hairpin_next_t next_index;
+ u32 pkts_processed = 0;
+ snat_main_t *sm = &snat_main;
+ vnet_feature_main_t *fm = &feature_main;
+ u8 arc_index = vnet_feat_arc_ip4_local.feature_arc_index;
+ vnet_feature_config_main_t *cm = &fm->feature_config_mains[arc_index];
+
+ stats_node_index = is_ed ? nat44_ed_hairpinning_node.index :
+ nat44_hairpinning_node.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 > 0 && n_left_to_next > 0)
+ {
+ u32 bi0;
+ vlib_buffer_t *b0;
+ u32 next0;
+ ip4_header_t *ip0;
+ u32 proto0;
+ udp_header_t *udp0;
+ tcp_header_t *tcp0;
+
+ /* 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;
+
+ proto0 = ip_proto_to_snat_proto (ip0->protocol);
+
+ vnet_get_config_data (&cm->config_main, &b0->current_config_index,
+ &next0, 0);
+
+ if (snat_hairpinning (sm, b0, ip0, udp0, tcp0, proto0, is_ed))
+ next0 = NAT_HAIRPIN_NEXT_LOOKUP;
+
+ pkts_processed += next0 != NAT_HAIRPIN_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, stats_node_index,
+ NAT44_HAIRPIN_ERROR_PROCESSED, pkts_processed);
+ return frame->n_vectors;
+}
+
+static uword
+nat44_hairpinning_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+ return nat44_hairpinning_fn_inline (vm, node, frame, 0);
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (nat44_hairpinning_node) = {
+ .function = nat44_hairpinning_fn,
+ .name = "nat44-hairpinning",
+ .vector_size = sizeof (u32),
+ .type = VLIB_NODE_TYPE_INTERNAL,
+ .n_errors = ARRAY_LEN(nat44_hairpin_error_strings),
+ .error_strings = nat44_hairpin_error_strings,
+ .n_next_nodes = NAT_HAIRPIN_N_NEXT,
+ .next_nodes = {
+ [NAT_HAIRPIN_NEXT_DROP] = "error-drop",
+ [NAT_HAIRPIN_NEXT_LOOKUP] = "ip4-lookup",
+ },
+};
+/* *INDENT-ON* */
+
+VLIB_NODE_FUNCTION_MULTIARCH (nat44_hairpinning_node, nat44_hairpinning_fn);
+
+static uword
+nat44_ed_hairpinning_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+ return nat44_hairpinning_fn_inline (vm, node, frame, 1);
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (nat44_ed_hairpinning_node) = {
+ .function = nat44_ed_hairpinning_fn,
+ .name = "nat44-ed-hairpinning",
+ .vector_size = sizeof (u32),
+ .type = VLIB_NODE_TYPE_INTERNAL,
+ .n_errors = ARRAY_LEN(nat44_hairpin_error_strings),
+ .error_strings = nat44_hairpin_error_strings,
+ .n_next_nodes = NAT_HAIRPIN_N_NEXT,
+ .next_nodes = {
+ [NAT_HAIRPIN_NEXT_DROP] = "error-drop",
+ [NAT_HAIRPIN_NEXT_LOOKUP] = "ip4-lookup",
+ },
+};
+/* *INDENT-ON* */
+
+VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_hairpinning_node,
+ nat44_ed_hairpinning_fn);
+
+static inline uword
+snat_hairpin_dst_fn_inline (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame, int is_ed)
+{
+ u32 n_left_from, *from, *to_next, stats_node_index;
+ nat_hairpin_next_t next_index;
+ u32 pkts_processed = 0;
+ snat_main_t *sm = &snat_main;
+
+ stats_node_index = is_ed ? nat44_ed_hairpin_dst_node.index :
+ snat_hairpin_dst_node.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 > 0 && n_left_to_next > 0)
+ {
+ u32 bi0;
+ vlib_buffer_t *b0;
+ u32 next0;
+ ip4_header_t *ip0;
+ u32 proto0;
+
+ /* 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 = NAT_HAIRPIN_NEXT_LOOKUP;
+ ip0 = vlib_buffer_get_current (b0);
+
+ proto0 = ip_proto_to_snat_proto (ip0->protocol);
+
+ vnet_buffer (b0)->snat.flags = 0;
+ if (PREDICT_FALSE (is_hairpinning (sm, &ip0->dst_address)))
+ {
+ if (proto0 == SNAT_PROTOCOL_TCP || proto0 == SNAT_PROTOCOL_UDP)
+ {
+ udp_header_t *udp0 = ip4_next_header (ip0);
+ tcp_header_t *tcp0 = (tcp_header_t *) udp0;
+
+ snat_hairpinning (sm, b0, ip0, udp0, tcp0, proto0, is_ed);
+ }
+ else if (proto0 == SNAT_PROTOCOL_ICMP)
+ {
+ icmp46_header_t *icmp0 = ip4_next_header (ip0);
+
+ snat_icmp_hairpinning (sm, b0, ip0, icmp0, is_ed);
+ }
+ else
+ {
+ if (is_ed)
+ nat44_ed_hairpinning_unknown_proto (sm, b0, ip0);
+ else
+ nat_hairpinning_sm_unknown_proto (sm, b0, ip0);
+ }
+
+ vnet_buffer (b0)->snat.flags = SNAT_FLAG_HAIRPINNING;
+ }
+
+ pkts_processed += next0 != NAT_HAIRPIN_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, stats_node_index,
+ NAT44_HAIRPIN_ERROR_PROCESSED, pkts_processed);
+ return frame->n_vectors;
+}
+
+static uword
+snat_hairpin_dst_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+ return snat_hairpin_dst_fn_inline (vm, node, frame, 0);
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (snat_hairpin_dst_node) = {
+ .function = snat_hairpin_dst_fn,
+ .name = "nat44-hairpin-dst",
+ .vector_size = sizeof (u32),
+ .type = VLIB_NODE_TYPE_INTERNAL,
+ .n_errors = ARRAY_LEN(nat44_hairpin_error_strings),
+ .error_strings = nat44_hairpin_error_strings,
+ .n_next_nodes = NAT_HAIRPIN_N_NEXT,
+ .next_nodes = {
+ [NAT_HAIRPIN_NEXT_DROP] = "error-drop",
+ [NAT_HAIRPIN_NEXT_LOOKUP] = "ip4-lookup",
+ },
+};
+/* *INDENT-ON* */
+
+VLIB_NODE_FUNCTION_MULTIARCH (snat_hairpin_dst_node, snat_hairpin_dst_fn);
+
+static uword
+nat44_ed_hairpin_dst_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+ return snat_hairpin_dst_fn_inline (vm, node, frame, 1);
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (nat44_ed_hairpin_dst_node) = {
+ .function = nat44_ed_hairpin_dst_fn,
+ .name = "nat44-ed-hairpin-dst",
+ .vector_size = sizeof (u32),
+ .type = VLIB_NODE_TYPE_INTERNAL,
+ .n_errors = ARRAY_LEN(nat44_hairpin_error_strings),
+ .error_strings = nat44_hairpin_error_strings,
+ .n_next_nodes = NAT_HAIRPIN_N_NEXT,
+ .next_nodes = {
+ [NAT_HAIRPIN_NEXT_DROP] = "error-drop",
+ [NAT_HAIRPIN_NEXT_LOOKUP] = "ip4-lookup",
+ },
+};
+/* *INDENT-ON* */
+
+VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_hairpin_dst_node,
+ nat44_ed_hairpin_dst_fn);
+
+static inline uword
+snat_hairpin_src_fn_inline (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame, int is_ed)
+{
+ u32 n_left_from, *from, *to_next, stats_node_index;
+ snat_hairpin_src_next_t next_index;
+ u32 pkts_processed = 0;
+ snat_main_t *sm = &snat_main;
+
+ stats_node_index = is_ed ? nat44_ed_hairpin_src_node.index :
+ snat_hairpin_src_node.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 > 0 && n_left_to_next > 0)
+ {
+ u32 bi0;
+ vlib_buffer_t *b0;
+ u32 next0;
+ snat_interface_t *i;
+ u32 sw_if_index0;
+
+ /* 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);
+ sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
+ next0 = SNAT_HAIRPIN_SRC_NEXT_INTERFACE_OUTPUT;
+
+ /* *INDENT-OFF* */
+ pool_foreach (i, sm->output_feature_interfaces,
+ ({
+ /* Only packets from NAT inside interface */
+ if ((nat_interface_is_inside(i)) && (sw_if_index0 == i->sw_if_index))
+ {
+ if (PREDICT_FALSE ((vnet_buffer (b0)->snat.flags) &
+ SNAT_FLAG_HAIRPINNING))
+ {
+ if (PREDICT_TRUE (sm->num_workers > 1))
+ next0 = SNAT_HAIRPIN_SRC_NEXT_SNAT_IN2OUT_WH;
+ else
+ next0 = SNAT_HAIRPIN_SRC_NEXT_SNAT_IN2OUT;
+ }
+ break;
+ }
+ }));
+ /* *INDENT-ON* */
+
+ pkts_processed += next0 != SNAT_HAIRPIN_SRC_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, stats_node_index,
+ NAT44_HAIRPIN_ERROR_PROCESSED, pkts_processed);
+ return frame->n_vectors;
+}
+
+static uword
+snat_hairpin_src_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+ return snat_hairpin_src_fn_inline (vm, node, frame, 0);
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (snat_hairpin_src_node) = {
+ .function = snat_hairpin_src_fn,
+ .name = "nat44-hairpin-src",
+ .vector_size = sizeof (u32),
+ .type = VLIB_NODE_TYPE_INTERNAL,
+ .n_errors = ARRAY_LEN(nat44_hairpin_error_strings),
+ .error_strings = nat44_hairpin_error_strings,
+ .n_next_nodes = SNAT_HAIRPIN_SRC_N_NEXT,
+ .next_nodes = {
+ [SNAT_HAIRPIN_SRC_NEXT_DROP] = "error-drop",
+ [SNAT_HAIRPIN_SRC_NEXT_SNAT_IN2OUT] = "nat44-in2out-output",
+ [SNAT_HAIRPIN_SRC_NEXT_INTERFACE_OUTPUT] = "interface-output",
+ [SNAT_HAIRPIN_SRC_NEXT_SNAT_IN2OUT_WH] = "nat44-in2out-output-worker-handoff",
+ },
+};
+/* *INDENT-ON* */
+
+VLIB_NODE_FUNCTION_MULTIARCH (snat_hairpin_src_node, snat_hairpin_src_fn);
+
+static uword
+nat44_ed_hairpin_src_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+ return snat_hairpin_src_fn_inline (vm, node, frame, 1);
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (nat44_ed_hairpin_src_node) = {
+ .function = nat44_ed_hairpin_src_fn,
+ .name = "nat44-ed-hairpin-src",
+ .vector_size = sizeof (u32),
+ .type = VLIB_NODE_TYPE_INTERNAL,
+ .n_errors = ARRAY_LEN(nat44_hairpin_error_strings),
+ .error_strings = nat44_hairpin_error_strings,
+ .n_next_nodes = SNAT_HAIRPIN_SRC_N_NEXT,
+ .next_nodes = {
+ [SNAT_HAIRPIN_SRC_NEXT_DROP] = "error-drop",
+ [SNAT_HAIRPIN_SRC_NEXT_SNAT_IN2OUT] = "nat44-ed-in2out-output",
+ [SNAT_HAIRPIN_SRC_NEXT_INTERFACE_OUTPUT] = "interface-output",
+ [SNAT_HAIRPIN_SRC_NEXT_SNAT_IN2OUT_WH] = "nat44-in2out-output-worker-handoff",
+ },
+};
+/* *INDENT-ON* */
+
+VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_hairpin_src_node,
+ nat44_ed_hairpin_src_fn);
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */