diff options
Diffstat (limited to 'src/plugins/nat/out2in_ed.c')
| -rw-r--r-- | src/plugins/nat/out2in_ed.c | 1868 |
1 files changed, 1868 insertions, 0 deletions
diff --git a/src/plugins/nat/out2in_ed.c b/src/plugins/nat/out2in_ed.c new file mode 100644 index 00000000000..4236285df8d --- /dev/null +++ b/src/plugins/nat/out2in_ed.c @@ -0,0 +1,1868 @@ +/* + * 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 endpoint-dependent outside to inside network translation + */ + +#include <vlib/vlib.h> +#include <vnet/vnet.h> +#include <vnet/pg/pg.h> +#include <vnet/ip/ip.h> +#include <vnet/ethernet/ethernet.h> +#include <vnet/fib/ip4_fib.h> +#include <vnet/udp/udp.h> +#include <vppinfra/error.h> +#include <nat/nat.h> +#include <nat/nat_ipfix_logging.h> +#include <nat/nat_reass.h> +#include <nat/nat_inlines.h> + +#define foreach_nat_out2in_ed_error \ +_(UNSUPPORTED_PROTOCOL, "Unsupported protocol") \ +_(OUT2IN_PACKETS, "Good out2in packets processed") \ +_(OUT_OF_PORTS, "Out of ports") \ +_(BAD_ICMP_TYPE, "unsupported ICMP type") \ +_(NO_TRANSLATION, "No translation") \ +_(MAX_SESSIONS_EXCEEDED, "Maximum sessions exceeded") \ +_(DROP_FRAGMENT, "Drop fragment") \ +_(MAX_REASS, "Maximum reassemblies exceeded") \ +_(MAX_FRAG, "Maximum fragments per reassembly exceeded") + +typedef enum +{ +#define _(sym,str) NAT_OUT2IN_ED_ERROR_##sym, + foreach_nat_out2in_ed_error +#undef _ + NAT_OUT2IN_ED_N_ERROR, +} nat_out2in_ed_error_t; + +static char *nat_out2in_ed_error_strings[] = { +#define _(sym,string) string, + foreach_nat_out2in_ed_error +#undef _ +}; + +typedef enum +{ + NAT44_ED_OUT2IN_NEXT_DROP, + NAT44_ED_OUT2IN_NEXT_LOOKUP, + NAT44_ED_OUT2IN_NEXT_ICMP_ERROR, + NAT44_ED_OUT2IN_NEXT_IN2OUT, + NAT44_ED_OUT2IN_NEXT_SLOW_PATH, + NAT44_ED_OUT2IN_NEXT_REASS, + NAT44_ED_OUT2IN_N_NEXT, +} nat44_ed_out2in_next_t; + +typedef struct +{ + u32 sw_if_index; + u32 next_index; + u32 session_index; + u32 is_slow_path; +} nat44_ed_out2in_trace_t; + +vlib_node_registration_t nat44_ed_out2in_node; +vlib_node_registration_t nat44_ed_out2in_slowpath_node; +vlib_node_registration_t nat44_ed_out2in_reass_node; + +static u8 * +format_nat44_ed_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 *); + nat44_ed_out2in_trace_t *t = va_arg (*args, nat44_ed_out2in_trace_t *); + char *tag; + + tag = + t->is_slow_path ? "NAT44_OUT2IN_ED_SLOW_PATH" : + "NAT44_OUT2IN_ED_FAST_PATH"; + + s = format (s, "%s: sw_if_index %d, next index %d, session %d", tag, + t->sw_if_index, t->next_index, t->session_index); + + return s; +} + +static inline u32 +icmp_out2in_ed_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) +{ + 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 != NAT44_ED_OUT2IN_NEXT_DROP && s0)) + { + /* Accounting */ + nat44_session_update_counters (s0, now, + vlib_buffer_length_in_chain + (sm->vlib_main, b0)); + } + return next0; +} + +int +nat44_o2i_ed_is_idle_session_cb (clib_bihash_kv_16_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; + nat_ed_ses_key_t ed_key; + clib_bihash_kv_16_8_t ed_kv; + int i; + snat_address_t *a; + snat_session_key_t key; + snat_main_per_thread_data_t *tsm = vec_elt_at_index (sm->per_thread_data, + ctx->thread_index); + + 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) + { + ed_key.l_addr = s->in2out.addr; + ed_key.r_addr = s->ext_host_addr; + ed_key.fib_index = s->out2in.fib_index; + if (snat_is_unk_proto_session (s)) + { + ed_key.proto = s->in2out.port; + ed_key.r_port = 0; + ed_key.l_port = 0; + } + else + { + ed_key.proto = snat_proto_to_ip_proto (s->in2out.protocol); + ed_key.l_port = s->in2out.port; + ed_key.r_port = s->ext_host_port; + } + if (is_twice_nat_session (s)) + { + ed_key.r_addr = s->ext_host_nat_addr; + ed_key.r_port = s->ext_host_nat_port; + } + ed_kv.key[0] = ed_key.as_u64[0]; + ed_kv.key[1] = ed_key.as_u64[1]; + if (clib_bihash_add_del_16_8 (&tsm->in2out_ed, &ed_kv, 0)) + nat_log_warn ("in2out_ed key del failed"); + + if (snat_is_unk_proto_session (s)) + goto delete; + + snat_ipfix_logging_nat44_ses_delete (s->in2out.addr.as_u32, + s->out2in.addr.as_u32, + s->in2out.protocol, + s->in2out.port, + s->out2in.port, + s->in2out.fib_index); + + if (is_twice_nat_session (s)) + { + for (i = 0; i < vec_len (sm->twice_nat_addresses); i++) + { + key.protocol = s->in2out.protocol; + key.port = s->ext_host_nat_port; + a = sm->twice_nat_addresses + i; + if (a->addr.as_u32 == s->ext_host_nat_addr.as_u32) + { + snat_free_outside_address_and_port (sm->twice_nat_addresses, + ctx->thread_index, + &key); + break; + } + } + } + + if (snat_is_session_static (s)) + goto delete; + + snat_free_outside_address_and_port (sm->addresses, ctx->thread_index, + &s->out2in); + delete: + nat44_delete_session (sm, s, ctx->thread_index); + return 1; + } + + return 0; +} + +static snat_session_t * +create_session_for_static_mapping_ed (snat_main_t * sm, + vlib_buffer_t * b, + snat_session_key_t l_key, + snat_session_key_t e_key, + vlib_node_runtime_t * node, + u32 thread_index, + twice_nat_type_t twice_nat, + lb_nat_type_t lb_nat, f64 now) +{ + snat_session_t *s; + snat_user_t *u; + ip4_header_t *ip; + udp_header_t *udp; + snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index]; + clib_bihash_kv_16_8_t kv; + snat_session_key_t eh_key; + nat44_is_idle_session_ctx_t ctx; + + if (PREDICT_FALSE (maximum_sessions_exceeded (sm, thread_index))) + { + b->error = node->errors[NAT_OUT2IN_ED_ERROR_MAX_SESSIONS_EXCEEDED]; + nat_log_notice ("maximum sessions exceeded"); + return 0; + } + + u = nat_user_get_or_create (sm, &l_key.addr, l_key.fib_index, thread_index); + if (!u) + { + nat_log_warn ("create NAT user failed"); + return 0; + } + + s = nat_ed_session_alloc (sm, u, thread_index); + if (!s) + { + nat44_delete_user_with_no_session (sm, u, thread_index); + nat_log_warn ("create NAT session failed"); + return 0; + } + + ip = vlib_buffer_get_current (b); + udp = ip4_next_header (ip); + + s->ext_host_addr.as_u32 = ip->src_address.as_u32; + s->ext_host_port = e_key.protocol == SNAT_PROTOCOL_ICMP ? 0 : udp->src_port; + s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING; + if (lb_nat) + s->flags |= SNAT_SESSION_FLAG_LOAD_BALANCING; + if (lb_nat == AFFINITY_LB_NAT) + s->flags |= SNAT_SESSION_FLAG_AFFINITY; + s->flags |= SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT; + s->out2in = e_key; + s->in2out = l_key; + s->in2out.protocol = s->out2in.protocol; + user_session_increment (sm, u, 1); + + /* Add to lookup tables */ + make_ed_kv (&kv, &e_key.addr, &s->ext_host_addr, ip->protocol, + e_key.fib_index, e_key.port, s->ext_host_port); + kv.value = s - tsm->sessions; + ctx.now = now; + ctx.thread_index = thread_index; + if (clib_bihash_add_or_overwrite_stale_16_8 (&tsm->out2in_ed, &kv, + nat44_o2i_ed_is_idle_session_cb, + &ctx)) + nat_log_notice ("out2in-ed key add failed"); + + if (twice_nat == TWICE_NAT || (twice_nat == TWICE_NAT_SELF && + ip->src_address.as_u32 == l_key.addr.as_u32)) + { + eh_key.protocol = e_key.protocol; + if (snat_alloc_outside_address_and_port (sm->twice_nat_addresses, 0, + thread_index, &eh_key, + sm->port_per_thread, + tsm->snat_thread_index)) + { + b->error = node->errors[NAT_OUT2IN_ED_ERROR_OUT_OF_PORTS]; + nat44_delete_session (sm, s, thread_index); + if (clib_bihash_add_del_16_8 (&tsm->out2in_ed, &kv, 0)) + nat_log_notice ("out2in-ed key del failed"); + return 0; + } + s->ext_host_nat_addr.as_u32 = eh_key.addr.as_u32; + s->ext_host_nat_port = eh_key.port; + s->flags |= SNAT_SESSION_FLAG_TWICE_NAT; + make_ed_kv (&kv, &l_key.addr, &s->ext_host_nat_addr, ip->protocol, + l_key.fib_index, l_key.port, s->ext_host_nat_port); + } + else + { + make_ed_kv (&kv, &l_key.addr, &s->ext_host_addr, ip->protocol, + l_key.fib_index, l_key.port, s->ext_host_port); + } + kv.value = s - tsm->sessions; + if (clib_bihash_add_or_overwrite_stale_16_8 (&tsm->in2out_ed, &kv, + nat44_i2o_ed_is_idle_session_cb, + &ctx)) + nat_log_notice ("in2out-ed key add failed"); + + return s; +} + +static_always_inline int +icmp_get_ed_key (ip4_header_t * ip0, nat_ed_ses_key_t * p_key0) +{ + icmp46_header_t *icmp0; + nat_ed_ses_key_t key0; + 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_is_error_message (icmp0)) + { + key0.proto = IP_PROTOCOL_ICMP; + key0.l_addr = ip0->dst_address; + key0.r_addr = ip0->src_address; + key0.l_port = echo0->identifier; + key0.r_port = 0; + } + else + { + inner_ip0 = (ip4_header_t *) (echo0 + 1); + l4_header = ip4_next_header (inner_ip0); + key0.proto = inner_ip0->protocol; + key0.l_addr = inner_ip0->src_address; + key0.r_addr = inner_ip0->dst_address; + switch (ip_proto_to_snat_proto (inner_ip0->protocol)) + { + case SNAT_PROTOCOL_ICMP: + inner_icmp0 = (icmp46_header_t *) l4_header; + inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1); + key0.l_port = inner_echo0->identifier; + key0.r_port = 0; + break; + case SNAT_PROTOCOL_UDP: + case SNAT_PROTOCOL_TCP: + key0.l_port = ((tcp_udp_header_t *) l4_header)->src_port; + key0.r_port = ((tcp_udp_header_t *) l4_header)->dst_port; + break; + default: + return -1; + } + } + *p_key0 = key0; + return 0; +} + +static int +next_src_nat (snat_main_t * sm, ip4_header_t * ip, u8 proto, u16 src_port, + u16 dst_port, u32 thread_index, u32 rx_fib_index) +{ + clib_bihash_kv_16_8_t kv, value; + snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index]; + + make_ed_kv (&kv, &ip->src_address, &ip->dst_address, proto, + rx_fib_index, src_port, dst_port); + if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value)) + return 1; + + return 0; +} + +static void +create_bypass_for_fwd (snat_main_t * sm, ip4_header_t * ip, u32 rx_fib_index, + u32 thread_index) +{ + nat_ed_ses_key_t key; + clib_bihash_kv_16_8_t kv, value; + udp_header_t *udp; + snat_user_t *u; + snat_session_t *s = 0; + snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index]; + f64 now = vlib_time_now (sm->vlib_main); + + if (ip->protocol == IP_PROTOCOL_ICMP) + { + if (icmp_get_ed_key (ip, &key)) + return; + } + else if (ip->protocol == IP_PROTOCOL_UDP || ip->protocol == IP_PROTOCOL_TCP) + { + udp = ip4_next_header (ip); + key.r_addr = ip->src_address; + key.l_addr = ip->dst_address; + key.proto = ip->protocol; + key.l_port = udp->dst_port; + key.r_port = udp->src_port; + } + else + { + key.r_addr = ip->src_address; + key.l_addr = ip->dst_address; + key.proto = ip->protocol; + key.l_port = key.r_port = 0; + } + key.fib_index = 0; + kv.key[0] = key.as_u64[0]; + kv.key[1] = key.as_u64[1]; + + if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value)) + { + s = pool_elt_at_index (tsm->sessions, value.value); + } + else + { + if (PREDICT_FALSE (maximum_sessions_exceeded (sm, thread_index))) + return; + + u = nat_user_get_or_create (sm, &ip->dst_address, sm->inside_fib_index, + thread_index); + if (!u) + { + nat_log_warn ("create NAT user failed"); + return; + } + + s = nat_ed_session_alloc (sm, u, thread_index); + if (!s) + { + nat44_delete_user_with_no_session (sm, u, thread_index); + nat_log_warn ("create NAT session failed"); + return; + } + + s->ext_host_addr = key.r_addr; + s->ext_host_port = key.r_port; + s->flags |= SNAT_SESSION_FLAG_FWD_BYPASS; + s->out2in.addr = key.l_addr; + s->out2in.port = key.l_port; + s->out2in.protocol = ip_proto_to_snat_proto (key.proto); + s->out2in.fib_index = 0; + s->in2out = s->out2in; + user_session_increment (sm, u, 0); + + kv.value = s - tsm->sessions; + if (clib_bihash_add_del_16_8 (&tsm->in2out_ed, &kv, 1)) + nat_log_notice ("in2out_ed key add failed"); + } + + if (ip->protocol == IP_PROTOCOL_TCP) + { + tcp_header_t *tcp = ip4_next_header (ip); + if (nat44_set_tcp_session_state_o2i (sm, s, tcp, thread_index)) + return; + } + + /* Accounting */ + nat44_session_update_counters (s, now, 0); +} + +u32 +icmp_match_out2in_ed (snat_main_t * sm, vlib_node_runtime_t * node, + u32 thread_index, vlib_buffer_t * b, ip4_header_t * ip, + u8 * p_proto, snat_session_key_t * p_value, + u8 * p_dont_translate, void *d, void *e) +{ + u32 next = ~0, sw_if_index, rx_fib_index; + icmp46_header_t *icmp; + nat_ed_ses_key_t key; + clib_bihash_kv_16_8_t kv, value; + snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index]; + snat_session_t *s = 0; + u8 dont_translate = 0, is_addr_only; + snat_session_key_t e_key, l_key; + + icmp = (icmp46_header_t *) ip4_next_header (ip); + sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX]; + rx_fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index); + + if (icmp_get_ed_key (ip, &key)) + { + b->error = node->errors[NAT_OUT2IN_ED_ERROR_UNSUPPORTED_PROTOCOL]; + next = NAT44_ED_OUT2IN_NEXT_DROP; + goto out; + } + key.fib_index = rx_fib_index; + kv.key[0] = key.as_u64[0]; + kv.key[1] = key.as_u64[1]; + + if (clib_bihash_search_16_8 (&tsm->out2in_ed, &kv, &value)) + { + /* Try to match static mapping */ + e_key.addr = ip->dst_address; + e_key.port = key.l_port; + e_key.protocol = ip_proto_to_snat_proto (key.proto); + e_key.fib_index = rx_fib_index; + if (snat_static_mapping_match + (sm, e_key, &l_key, 1, &is_addr_only, 0, 0, 0)) + { + if (!sm->forwarding_enabled) + { + /* Don't NAT packet aimed at the intfc address */ + if (PREDICT_FALSE (is_interface_addr (sm, node, sw_if_index, + ip->dst_address.as_u32))) + { + dont_translate = 1; + goto out; + } + b->error = node->errors[NAT_OUT2IN_ED_ERROR_NO_TRANSLATION]; + next = NAT44_ED_OUT2IN_NEXT_DROP; + goto out; + } + else + { + dont_translate = 1; + if (next_src_nat (sm, ip, key.proto, key.l_port, key.r_port, + thread_index, rx_fib_index)) + { + next = NAT44_ED_OUT2IN_NEXT_IN2OUT; + goto out; + } + create_bypass_for_fwd (sm, ip, rx_fib_index, thread_index); + goto out; + } + } + + if (PREDICT_FALSE (icmp->type != ICMP4_echo_reply && + (icmp->type != ICMP4_echo_request || !is_addr_only))) + { + b->error = node->errors[NAT_OUT2IN_ED_ERROR_BAD_ICMP_TYPE]; + next = NAT44_ED_OUT2IN_NEXT_DROP; + goto out; + } + + /* Create session initiated by host from external network */ + s = create_session_for_static_mapping_ed (sm, b, l_key, e_key, node, + thread_index, 0, 0, + vlib_time_now + (sm->vlib_main)); + + if (!s) + { + next = NAT44_ED_OUT2IN_NEXT_DROP; + goto out; + } + } + else + { + if (PREDICT_FALSE (icmp->type != ICMP4_echo_reply && + icmp->type != ICMP4_echo_request && + !icmp_is_error_message (icmp))) + { + b->error = node->errors[NAT_OUT2IN_ED_ERROR_BAD_ICMP_TYPE]; + next = NAT44_ED_OUT2IN_NEXT_DROP; + goto out; + } + + s = pool_elt_at_index (tsm->sessions, value.value); + } + + *p_proto = ip_proto_to_snat_proto (key.proto); +out: + if (s) + *p_value = s->in2out; + *p_dont_translate = dont_translate; + if (d) + *(snat_session_t **) d = s; + return next; +} + +static snat_session_t * +nat44_ed_out2in_unknown_proto (snat_main_t * sm, + vlib_buffer_t * b, + ip4_header_t * ip, + u32 rx_fib_index, + u32 thread_index, + f64 now, + vlib_main_t * vm, vlib_node_runtime_t * node) +{ + clib_bihash_kv_8_8_t kv, value; + clib_bihash_kv_16_8_t s_kv, s_value; + snat_static_mapping_t *m; + u32 old_addr, new_addr; + ip_csum_t sum; + snat_session_t *s; + snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index]; + snat_user_t *u; + + old_addr = ip->dst_address.as_u32; + + make_ed_kv (&s_kv, &ip->dst_address, &ip->src_address, ip->protocol, + rx_fib_index, 0, 0); + + if (!clib_bihash_search_16_8 (&tsm->out2in_ed, &s_kv, &s_value)) + { + s = pool_elt_at_index (tsm->sessions, s_value.value); + new_addr = ip->dst_address.as_u32 = s->in2out.addr.as_u32; + } + else + { + if (PREDICT_FALSE (maximum_sessions_exceeded (sm, thread_index))) + { + b->error = node->errors[NAT_OUT2IN_ED_ERROR_MAX_SESSIONS_EXCEEDED]; + nat_log_notice ("maximum sessions exceeded"); + return 0; + } + + make_sm_kv (&kv, &ip->dst_address, 0, 0, 0); + if (clib_bihash_search_8_8 + (&sm->static_mapping_by_external, &kv, &value)) + { + b->error = node->errors[NAT_OUT2IN_ED_ERROR_NO_TRANSLATION]; + return 0; + } + + m = pool_elt_at_index (sm->static_mappings, value.value); + + new_addr = ip->dst_address.as_u32 = m->local_addr.as_u32; + + u = nat_user_get_or_create (sm, &m->local_addr, m->fib_index, + thread_index); + if (!u) + { + nat_log_warn ("create NAT user failed"); + return 0; + } + + /* Create a new session */ + s = nat_ed_session_alloc (sm, u, thread_index); + if (!s) + { + nat44_delete_user_with_no_session (sm, u, thread_index); + nat_log_warn ("create NAT session failed"); + return 0; + } + + s->ext_host_addr.as_u32 = ip->src_address.as_u32; + s->flags |= SNAT_SESSION_FLAG_UNKNOWN_PROTO; + s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING; + s->flags |= SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT; + s->out2in.addr.as_u32 = old_addr; + s->out2in.fib_index = rx_fib_index; + s->in2out.addr.as_u32 = new_addr; + s->in2out.fib_index = m->fib_index; + s->in2out.port = s->out2in.port = ip->protocol; + user_session_increment (sm, u, 1); + + /* Add to lookup tables */ + s_kv.value = s - tsm->sessions; + if (clib_bihash_add_del_16_8 (&tsm->out2in_ed, &s_kv, 1)) + nat_log_notice ("out2in key add failed"); + + make_ed_kv (&s_kv, &ip->dst_address, &ip->src_address, ip->protocol, + m->fib_index, 0, 0); + s_kv.value = s - tsm->sessions; + if (clib_bihash_add_del_16_8 (&tsm->in2out_ed, &s_kv, 1)) + nat_log_notice ("in2out key add failed"); + } + + /* Update IP checksum */ + 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] = s->in2out.fib_index; + + /* Accounting */ + nat44_session_update_counters (s, now, vlib_buffer_length_in_chain (vm, b)); + + return s; +} + +static inline uword +nat44_ed_out2in_node_fn_inline (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame, int is_slow_path) +{ + u32 n_left_from, *from, *to_next, pkts_processed = 0, stats_node_index; + nat44_ed_out2in_next_t next_index; + 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]; + + stats_node_index = is_slow_path ? nat44_ed_out2in_slowpath_node.index : + nat44_ed_out2in_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 >= 4 && n_left_to_next >= 2) + { + u32 bi0, bi1; + vlib_buffer_t *b0, *b1; + u32 next0, sw_if_index0, rx_fib_index0, proto0, old_addr0, + new_addr0; + u32 next1, sw_if_index1, rx_fib_index1, proto1, old_addr1, + new_addr1; + u16 old_port0, new_port0, old_port1, new_port1; + ip4_header_t *ip0, *ip1; + udp_header_t *udp0, *udp1; + tcp_header_t *tcp0, *tcp1; + icmp46_header_t *icmp0, *icmp1; + snat_session_t *s0 = 0, *s1 = 0; + clib_bihash_kv_16_8_t kv0, value0, kv1, value1; + ip_csum_t sum0, sum1; + snat_session_key_t e_key0, l_key0, e_key1, l_key1; + lb_nat_type_t lb_nat0, lb_nat1; + twice_nat_type_t twice_nat0, twice_nat1; + + /* 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); + + next0 = NAT44_ED_OUT2IN_NEXT_LOOKUP; + vnet_buffer (b0)->snat.flags = 0; + ip0 = vlib_buffer_get_current (b0); + + sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; + rx_fib_index0 = + fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4, + 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 = NAT44_ED_OUT2IN_NEXT_ICMP_ERROR; + goto trace00; + } + + udp0 = ip4_next_header (ip0); + tcp0 = (tcp_header_t *) udp0; + icmp0 = (icmp46_header_t *) udp0; + proto0 = ip_proto_to_snat_proto (ip0->protocol); + + if (is_slow_path) + { + if (PREDICT_FALSE (proto0 == ~0)) + { + s0 = + nat44_ed_out2in_unknown_proto (sm, b0, ip0, rx_fib_index0, + thread_index, now, vm, + node); + if (!sm->forwarding_enabled) + { + if (!s0) + next0 = NAT44_ED_OUT2IN_NEXT_DROP; + goto trace00; + } + } + + if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP)) + { + next0 = icmp_out2in_ed_slow_path + (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node, + next0, now, thread_index, &s0); + goto trace00; + } + } + else + { + if (PREDICT_FALSE (proto0 == ~0)) + { + next0 = NAT44_ED_OUT2IN_NEXT_SLOW_PATH; + goto trace00; + } + + if (ip4_is_fragment (ip0)) + { + next0 = NAT44_ED_OUT2IN_NEXT_REASS; + goto trace00; + } + + if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP)) + { + next0 = NAT44_ED_OUT2IN_NEXT_SLOW_PATH; + goto trace00; + } + } + + make_ed_kv (&kv0, &ip0->dst_address, &ip0->src_address, + ip0->protocol, rx_fib_index0, udp0->dst_port, + udp0->src_port); + + if (clib_bihash_search_16_8 (&tsm->out2in_ed, &kv0, &value0)) + { + if (is_slow_path) + { + /* Try to match static mapping by external address and port, + destination address and port in packet */ + e_key0.addr = ip0->dst_address; + e_key0.port = udp0->dst_port; + e_key0.protocol = proto0; + e_key0.fib_index = rx_fib_index0; + if (snat_static_mapping_match (sm, e_key0, &l_key0, 1, 0, + &twice_nat0, &lb_nat0, + &ip0->src_address)) + { + /* + * 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 == SNAT_PROTOCOL_UDP + && (udp0->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[NAT_OUT2IN_ED_ERROR_NO_TRANSLATION]; + next0 = NAT44_ED_OUT2IN_NEXT_DROP; + } + else + { + if (next_src_nat (sm, ip0, ip0->protocol, + udp0->src_port, udp0->dst_port, + thread_index, rx_fib_index0)) + { + next0 = NAT44_ED_OUT2IN_NEXT_IN2OUT; + goto trace00; + } + create_bypass_for_fwd (sm, ip0, rx_fib_index0, + thread_index); + } + goto trace00; + } + + /* Create session initiated by host from external network */ + s0 = create_session_for_static_mapping_ed (sm, b0, l_key0, + e_key0, node, + thread_index, + twice_nat0, + lb_nat0, now); + + if (!s0) + { + next0 = NAT44_ED_OUT2IN_NEXT_DROP; + goto trace00; + } + } + else + { + next0 = NAT44_ED_OUT2IN_NEXT_SLOW_PATH; + goto trace00; + } + } + else + { + s0 = pool_elt_at_index (tsm->sessions, value0.value); + } + + old_addr0 = ip0->dst_address.as_u32; + new_addr0 = ip0->dst_address.as_u32 = s0->in2out.addr.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); + if (PREDICT_FALSE (is_twice_nat_session (s0))) + sum0 = ip_csum_update (sum0, ip0->src_address.as_u32, + s0->ext_host_nat_addr.as_u32, ip4_header_t, + src_address); + ip0->checksum = ip_csum_fold (sum0); + + if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP)) + { + old_port0 = tcp0->dst_port; + new_port0 = tcp0->dst_port = s0->in2out.port; + + sum0 = tcp0->checksum; + sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, + dst_address); + sum0 = ip_csum_update (sum0, old_port0, new_port0, ip4_header_t, + length); + if (is_twice_nat_session (s0)) + { + sum0 = ip_csum_update (sum0, ip0->src_address.as_u32, + s0->ext_host_nat_addr.as_u32, + ip4_header_t, dst_address); + sum0 = ip_csum_update (sum0, tcp0->src_port, + s0->ext_host_nat_port, ip4_header_t, + length); + tcp0->src_port = s0->ext_host_nat_port; + ip0->src_address.as_u32 = s0->ext_host_nat_addr.as_u32; + } + tcp0->checksum = ip_csum_fold (sum0); + if (nat44_set_tcp_session_state_o2i + (sm, s0, tcp0, thread_index)) + goto trace00; + } + else + { + udp0->dst_port = s0->in2out.port; + if (is_twice_nat_session (s0)) + { + udp0->src_port = s0->ext_host_nat_port; + ip0->src_address.as_u32 = s0->ext_host_nat_addr.as_u32; + } + udp0->checksum = 0; + } + + /* Accounting */ + nat44_session_update_counters (s0, now, + vlib_buffer_length_in_chain (vm, + b0)); + + trace00: + if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) + && (b0->flags & VLIB_BUFFER_IS_TRACED))) + { + nat44_ed_out2in_trace_t *t = + vlib_add_trace (vm, node, b0, sizeof (*t)); + t->is_slow_path = is_slow_path; + t->sw_if_index = sw_if_index0; + t->next_index = next0; + t->session_index = ~0; + if (s0) + t->session_index = s0 - tsm->sessions; + } + + pkts_processed += next0 != NAT44_ED_OUT2IN_NEXT_DROP; + + next1 = NAT44_ED_OUT2IN_NEXT_LOOKUP; + vnet_buffer (b1)->snat.flags = 0; + ip1 = vlib_buffer_get_current (b1); + + sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX]; + rx_fib_index1 = + fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4, + 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 = NAT44_ED_OUT2IN_NEXT_ICMP_ERROR; + goto trace01; + } + + udp1 = ip4_next_header (ip1); + tcp1 = (tcp_header_t *) udp1; + icmp1 = (icmp46_header_t *) udp1; + proto1 = ip_proto_to_snat_proto (ip1->protocol); + + if (is_slow_path) + { + if (PREDICT_FALSE (proto1 == ~0)) + { + s1 = + nat44_ed_out2in_unknown_proto (sm, b1, ip1, rx_fib_index1, + thread_index, now, vm, + node); + if (!sm->forwarding_enabled) + { + if (!s1) + next1 = NAT44_ED_OUT2IN_NEXT_DROP; + goto trace01; + } + } + + if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP)) + { + next1 = icmp_out2in_ed_slow_path + (sm, b1, ip1, icmp1, sw_if_index1, rx_fib_index1, node, + next1, now, thread_index, &s1); + goto trace01; + } + } + else + { + if (PREDICT_FALSE (proto1 == ~0)) + { + next1 = NAT44_ED_OUT2IN_NEXT_SLOW_PATH; + goto trace01; + } + + if (ip4_is_fragment (ip1)) + { + next1 = NAT44_ED_OUT2IN_NEXT_REASS; + goto trace01; + } + + if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP)) + { + next1 = NAT44_ED_OUT2IN_NEXT_SLOW_PATH; + goto trace01; + } + } + + make_ed_kv (&kv1, &ip1->dst_address, &ip1->src_address, + ip1->protocol, rx_fib_index1, udp1->dst_port, + udp1->src_port); + + if (clib_bihash_search_16_8 (&tsm->out2in_ed, &kv1, &value1)) + { + if (is_slow_path) + { + /* Try to match static mapping by external address and port, + destination address and port in packet */ + e_key1.addr = ip1->dst_address; + e_key1.port = udp1->dst_port; + e_key1.protocol = proto1; + e_key1.fib_index = rx_fib_index1; + if (snat_static_mapping_match (sm, e_key1, &l_key1, 1, 0, + &twice_nat1, &lb_nat1, + &ip1->src_address)) + { + /* + * 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 == SNAT_PROTOCOL_UDP + && (udp1->dst_port == + clib_host_to_net_u16 + (UDP_DST_PORT_dhcp_to_client)))) + { + vnet_feature_next (&next1, b1); + goto trace01; + } + + if (!sm->forwarding_enabled) + { + b1->error = + node->errors[NAT_OUT2IN_ED_ERROR_NO_TRANSLATION]; + next1 = NAT44_ED_OUT2IN_NEXT_DROP; + } + else + { + if (next_src_nat (sm, ip1, ip1->protocol, + udp1->src_port, udp1->dst_port, + thread_index, rx_fib_index1)) + { + next1 = NAT44_ED_OUT2IN_NEXT_IN2OUT; + goto trace01; + } + create_bypass_for_fwd (sm, ip1, rx_fib_index1, + thread_index); + } + goto trace01; + } + + /* Create session initiated by host from external network */ + s1 = create_session_for_static_mapping_ed (sm, b1, l_key1, + e_key1, node, + thread_index, + twice_nat1, + lb_nat1, now); + + if (!s1) + { + next1 = NAT44_ED_OUT2IN_NEXT_DROP; + goto trace01; + } + } + else + { + next1 = NAT44_ED_OUT2IN_NEXT_SLOW_PATH; + goto trace01; + } + } + else + { + s1 = pool_elt_at_index (tsm->sessions, value1.value); + } + + old_addr1 = ip1->dst_address.as_u32; + new_addr1 = ip1->dst_address.as_u32 = s1->in2out.addr.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); + if (PREDICT_FALSE (is_twice_nat_session (s1))) + sum1 = ip_csum_update (sum1, ip1->src_address.as_u32, + s1->ext_host_nat_addr.as_u32, ip4_header_t, + src_address); + ip1->checksum = ip_csum_fold (sum1); + + if (PREDICT_TRUE (proto1 == SNAT_PROTOCOL_TCP)) + { + old_port1 = tcp1->dst_port; + new_port1 = tcp1->dst_port = s1->in2out.port; + + sum1 = tcp1->checksum; + sum1 = ip_csum_update (sum1, old_addr1, new_addr1, ip4_header_t, + dst_address); + sum1 = ip_csum_update (sum1, old_port1, new_port1, ip4_header_t, + length); + if (is_twice_nat_session (s1)) + { + sum1 = ip_csum_update (sum1, ip1->src_address.as_u32, + s1->ext_host_nat_addr.as_u32, + ip4_header_t, dst_address); + sum1 = ip_csum_update (sum1, tcp1->src_port, + s1->ext_host_nat_port, ip4_header_t, + length); + tcp1->src_port = s1->ext_host_nat_port; + ip1->src_address.as_u32 = s1->ext_host_nat_addr.as_u32; + } + tcp1->checksum = ip_csum_fold (sum1); + if (nat44_set_tcp_session_state_o2i + (sm, s1, tcp1, thread_index)) + goto trace01; + } + else + { + udp1->dst_port = s1->in2out.port; + if (is_twice_nat_session (s1)) + { + udp1->src_port = s1->ext_host_nat_port; + ip1->src_address.as_u32 = s1->ext_host_nat_addr.as_u32; + } + udp1->checksum = 0; + } + + /* Accounting */ + nat44_session_update_counters (s1, now, + vlib_buffer_length_in_chain (vm, + b1)); + + trace01: + if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) + && (b1->flags & VLIB_BUFFER_IS_TRACED))) + { + nat44_ed_out2in_trace_t *t = + vlib_add_trace (vm, node, b1, sizeof (*t)); + t->is_slow_path = is_slow_path; + t->sw_if_index = sw_if_index1; + t->next_index = next1; + t->session_index = ~0; + if (s1) + t->session_index = s1 - tsm->sessions; + } + + pkts_processed += next1 != NAT44_ED_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, sw_if_index0, rx_fib_index0, proto0, old_addr0, + new_addr0; + u16 old_port0, new_port0; + ip4_header_t *ip0; + udp_header_t *udp0; + tcp_header_t *tcp0; + icmp46_header_t *icmp0; + snat_session_t *s0 = 0; + clib_bihash_kv_16_8_t kv0, value0; + ip_csum_t sum0; + snat_session_key_t e_key0, l_key0; + lb_nat_type_t lb_nat0; + twice_nat_type_t twice_nat0; + + /* 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 = NAT44_ED_OUT2IN_NEXT_LOOKUP; + vnet_buffer (b0)->snat.flags = 0; + ip0 = vlib_buffer_get_current (b0); + + sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; + rx_fib_index0 = + fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4, + 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 = NAT44_ED_OUT2IN_NEXT_ICMP_ERROR; + goto trace0; + } + + udp0 = ip4_next_header (ip0); + tcp0 = (tcp_header_t *) udp0; + icmp0 = (icmp46_header_t *) udp0; + proto0 = ip_proto_to_snat_proto (ip0->protocol); + + if (is_slow_path) + { + if (PREDICT_FALSE (proto0 == ~0)) + { + s0 = + nat44_ed_out2in_unknown_proto (sm, b0, ip0, rx_fib_index0, + thread_index, now, vm, + node); + if (!sm->forwarding_enabled) + { + if (!s0) + next0 = NAT44_ED_OUT2IN_NEXT_DROP; + goto trace0; + } + } + + if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP)) + { + next0 = icmp_out2in_ed_slow_path + (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node, + next0, now, thread_index, &s0); + goto trace0; + } + } + else + { + if (PREDICT_FALSE (proto0 == ~0)) + { + next0 = NAT44_ED_OUT2IN_NEXT_SLOW_PATH; + goto trace0; + } + + if (ip4_is_fragment (ip0)) + { + next0 = NAT44_ED_OUT2IN_NEXT_REASS; + goto trace0; + } + + if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP)) + { + next0 = NAT44_ED_OUT2IN_NEXT_SLOW_PATH; + goto trace0; + } + } + + make_ed_kv (&kv0, &ip0->dst_address, &ip0->src_address, + ip0->protocol, rx_fib_index0, udp0->dst_port, + udp0->src_port); + + if (clib_bihash_search_16_8 (&tsm->out2in_ed, &kv0, &value0)) + { + if (is_slow_path) + { + /* Try to match static mapping by external address and port, + destination address and port in packet */ + e_key0.addr = ip0->dst_address; + e_key0.port = udp0->dst_port; + e_key0.protocol = proto0; + e_key0.fib_index = rx_fib_index0; + if (snat_static_mapping_match (sm, e_key0, &l_key0, 1, 0, + &twice_nat0, &lb_nat0, + &ip0->src_address)) + { + /* + * 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 == SNAT_PROTOCOL_UDP + && (udp0->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[NAT_OUT2IN_ED_ERROR_NO_TRANSLATION]; + next0 = NAT44_ED_OUT2IN_NEXT_DROP; + } + else + { + if (next_src_nat (sm, ip0, ip0->protocol, + udp0->src_port, udp0->dst_port, + thread_index, rx_fib_index0)) + { + next0 = NAT44_ED_OUT2IN_NEXT_IN2OUT; + goto trace0; + } + create_bypass_for_fwd (sm, ip0, rx_fib_index0, + thread_index); + } + goto trace0; + } + + /* Create session initiated by host from external network */ + s0 = create_session_for_static_mapping_ed (sm, b0, l_key0, + e_key0, node, + thread_index, + twice_nat0, + lb_nat0, now); + + if (!s0) + { + next0 = NAT44_ED_OUT2IN_NEXT_DROP; + goto trace0; + } + } + else + { + next0 = NAT44_ED_OUT2IN_NEXT_SLOW_PATH; + goto trace0; + } + } + else + { + s0 = pool_elt_at_index (tsm->sessions, value0.value); + } + + old_addr0 = ip0->dst_address.as_u32; + new_addr0 = ip0->dst_address.as_u32 = s0->in2out.addr.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); + if (PREDICT_FALSE (is_twice_nat_session (s0))) + sum0 = ip_csum_update (sum0, ip0->src_address.as_u32, + s0->ext_host_nat_addr.as_u32, ip4_header_t, + src_address); + ip0->checksum = ip_csum_fold (sum0); + + if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP)) + { + old_port0 = tcp0->dst_port; + new_port0 = tcp0->dst_port = s0->in2out.port; + + sum0 = tcp0->checksum; + sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, + dst_address); + sum0 = ip_csum_update (sum0, old_port0, new_port0, ip4_header_t, + length); + if (is_twice_nat_session (s0)) + { + sum0 = ip_csum_update (sum0, ip0->src_address.as_u32, + s0->ext_host_nat_addr.as_u32, + ip4_header_t, dst_address); + sum0 = ip_csum_update (sum0, tcp0->src_port, + s0->ext_host_nat_port, ip4_header_t, + length); + tcp0->src_port = s0->ext_host_nat_port; + ip0->src_address.as_u32 = s0->ext_host_nat_addr.as_u32; + } + tcp0->checksum = ip_csum_fold (sum0); + if (nat44_set_tcp_session_state_o2i + (sm, s0, tcp0, thread_index)) + goto trace0; + } + else + { + udp0->dst_port = s0->in2out.port; + if (is_twice_nat_session (s0)) + { + udp0->src_port = s0->ext_host_nat_port; + ip0->src_address.as_u32 = s0->ext_host_nat_addr.as_u32; + } + udp0->checksum = 0; + } + + /* Accounting */ + nat44_session_update_counters (s0, now, + vlib_buffer_length_in_chain (vm, + b0)); + + trace0: + if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) + && (b0->flags & VLIB_BUFFER_IS_TRACED))) + { + nat44_ed_out2in_trace_t *t = + vlib_add_trace (vm, node, b0, sizeof (*t)); + t->is_slow_path = is_slow_path; + t->sw_if_index = sw_if_index0; + t->next_index = next0; + t->session_index = ~0; + if (s0) + t->session_index = s0 - tsm->sessions; + } + + pkts_processed += next0 != NAT44_ED_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, stats_node_index, + NAT_OUT2IN_ED_ERROR_OUT2IN_PACKETS, + pkts_processed); + return frame->n_vectors; +} + +static uword +nat44_ed_out2in_fast_path_fn (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + return nat44_ed_out2in_node_fn_inline (vm, node, frame, 0); +} + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (nat44_ed_out2in_node) = { + .function = nat44_ed_out2in_fast_path_fn, + .name = "nat44-ed-out2in", + .vector_size = sizeof (u32), + .format_trace = format_nat44_ed_out2in_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + .n_errors = ARRAY_LEN(nat_out2in_ed_error_strings), + .error_strings = nat_out2in_ed_error_strings, + .runtime_data_bytes = sizeof (snat_runtime_t), + .n_next_nodes = NAT44_ED_OUT2IN_N_NEXT, + .next_nodes = { + [NAT44_ED_OUT2IN_NEXT_DROP] = "error-drop", + [NAT44_ED_OUT2IN_NEXT_LOOKUP] = "ip4-lookup", + [NAT44_ED_OUT2IN_NEXT_SLOW_PATH] = "nat44-ed-out2in-slowpath", + [NAT44_ED_OUT2IN_NEXT_ICMP_ERROR] = "ip4-icmp-error", + [NAT44_ED_OUT2IN_NEXT_IN2OUT] = "nat44-ed-in2out", + [NAT44_ED_OUT2IN_NEXT_REASS] = "nat44-ed-out2in-reass", + }, +}; +/* *INDENT-ON* */ + +VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_out2in_node, + nat44_ed_out2in_fast_path_fn); + +static uword +nat44_ed_out2in_slow_path_fn (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + return nat44_ed_out2in_node_fn_inline (vm, node, frame, 1); +} + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (nat44_ed_out2in_slowpath_node) = { + .function = nat44_ed_out2in_slow_path_fn, + .name = "nat44-ed-out2in-slowpath", + .vector_size = sizeof (u32), + .format_trace = format_nat44_ed_out2in_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + .n_errors = ARRAY_LEN(nat_out2in_ed_error_strings), + .error_strings = nat_out2in_ed_error_strings, + .runtime_data_bytes = sizeof (snat_runtime_t), + .n_next_nodes = NAT44_ED_OUT2IN_N_NEXT, + .next_nodes = { + [NAT44_ED_OUT2IN_NEXT_DROP] = "error-drop", + [NAT44_ED_OUT2IN_NEXT_LOOKUP] = "ip4-lookup", + [NAT44_ED_OUT2IN_NEXT_SLOW_PATH] = "nat44-ed-out2in-slowpath", + [NAT44_ED_OUT2IN_NEXT_ICMP_ERROR] = "ip4-icmp-error", + [NAT44_ED_OUT2IN_NEXT_IN2OUT] = "nat44-ed-in2out", + [NAT44_ED_OUT2IN_NEXT_REASS] = "nat44-ed-out2in-reass", + }, +}; +/* *INDENT-ON* */ + +VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_out2in_slowpath_node, + nat44_ed_out2in_slow_path_fn); + +static uword +nat44_ed_out2in_reass_node_fn (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + u32 n_left_from, *from, *to_next; + nat44_ed_out2in_next_t next_index; + u32 pkts_processed = 0; + snat_main_t *sm = &snat_main; + f64 now = vlib_time_now (vm); + u32 thread_index = vm->thread_index; + snat_main_per_thread_data_t *per_thread_data = + &sm->per_thread_data[thread_index]; + u32 *fragments_to_drop = 0; + u32 *fragments_to_loopback = 0; + + from = vlib_frame_vector_args (frame); + n_left_from = frame->n_vectors; + next_index = node->cached_next_index; + + while (n_left_from > 0) + { + u32 n_left_to_next; + + vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); + + while (n_left_from > 0 && n_left_to_next > 0) + { + u32 bi0, sw_if_index0, proto0, rx_fib_index0, new_addr0, old_addr0; + vlib_buffer_t *b0; + u32 next0; + u8 cached0 = 0; + ip4_header_t *ip0; + nat_reass_ip4_t *reass0; + udp_header_t *udp0; + tcp_header_t *tcp0; + icmp46_header_t *icmp0; + clib_bihash_kv_16_8_t kv0, value0; + snat_session_t *s0 = 0; + u16 old_port0, new_port0; + ip_csum_t sum0; + snat_session_key_t e_key0, l_key0; + lb_nat_type_t lb0; + twice_nat_type_t twice_nat0; + + /* 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 = NAT44_ED_OUT2IN_NEXT_LOOKUP; + + sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; + rx_fib_index0 = + fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4, + sw_if_index0); + + if (PREDICT_FALSE (nat_reass_is_drop_frag (0))) + { + next0 = NAT44_ED_OUT2IN_NEXT_DROP; + b0->error = node->errors[NAT_OUT2IN_ED_ERROR_DROP_FRAGMENT]; + goto trace0; + } + + ip0 = (ip4_header_t *) vlib_buffer_get_current (b0); + udp0 = ip4_next_header (ip0); + tcp0 = (tcp_header_t *) udp0; + icmp0 = (icmp46_header_t *) udp0; + proto0 = ip_proto_to_snat_proto (ip0->protocol); + + reass0 = nat_ip4_reass_find_or_create (ip0->src_address, + ip0->dst_address, + ip0->fragment_id, + ip0->protocol, + 1, &fragments_to_drop); + + if (PREDICT_FALSE (!reass0)) + { + next0 = NAT44_ED_OUT2IN_NEXT_DROP; + b0->error = node->errors[NAT_OUT2IN_ED_ERROR_MAX_REASS]; + nat_log_notice ("maximum reassemblies exceeded"); + goto trace0; + } + + if (PREDICT_FALSE (ip4_is_first_fragment (ip0))) + { + if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP)) + { + next0 = icmp_out2in_ed_slow_path + (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node, + next0, now, thread_index, &s0); + + if (PREDICT_TRUE (next0 != NAT44_ED_OUT2IN_NEXT_DROP)) + { + if (s0) + reass0->sess_index = s0 - per_thread_data->sessions; + else + reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE; + reass0->thread_index = thread_index; + nat_ip4_reass_get_frags (reass0, + &fragments_to_loopback); + } + + goto trace0; + } + + make_ed_kv (&kv0, &ip0->dst_address, &ip0->src_address, + ip0->protocol, rx_fib_index0, udp0->dst_port, + udp0->src_port); + + if (clib_bihash_search_16_8 + (&per_thread_data->out2in_ed, &kv0, &value0)) + { + /* Try to match static mapping by external address and port, + destination address and port in packet */ + e_key0.addr = ip0->dst_address; + e_key0.port = udp0->dst_port; + e_key0.protocol = proto0; + e_key0.fib_index = rx_fib_index0; + if (snat_static_mapping_match (sm, e_key0, &l_key0, 1, 0, + &twice_nat0, &lb0, 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 == SNAT_PROTOCOL_UDP + && (udp0->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[NAT_OUT2IN_ED_ERROR_NO_TRANSLATION]; + next0 = NAT44_ED_OUT2IN_NEXT_DROP; + } + else + { + if (next_src_nat (sm, ip0, ip0->protocol, + udp0->src_port, udp0->dst_port, + thread_index, rx_fib_index0)) + { + next0 = NAT44_ED_OUT2IN_NEXT_IN2OUT; + goto trace0; + } + create_bypass_for_fwd (sm, ip0, rx_fib_index0, + thread_index); + reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE; + nat_ip4_reass_get_frags (reass0, + &fragments_to_loopback); + } + goto trace0; + } + + /* Create session initiated by host from external network */ + s0 = create_session_for_static_mapping_ed (sm, b0, l_key0, + e_key0, node, + thread_index, + twice_nat0, lb0, + now); + if (!s0) + { + b0->error = + node->errors[NAT_OUT2IN_ED_ERROR_NO_TRANSLATION]; + next0 = NAT44_ED_OUT2IN_NEXT_DROP; + goto trace0; + } + reass0->sess_index = s0 - per_thread_data->sessions; + reass0->thread_index = thread_index; + } + else + { + s0 = pool_elt_at_index (per_thread_data->sessions, + value0.value); + reass0->sess_index = value0.value; + } + nat_ip4_reass_get_frags (reass0, &fragments_to_loopback); + } + else + { + if (reass0->flags & NAT_REASS_FLAG_ED_DONT_TRANSLATE) + goto trace0; + if (PREDICT_FALSE (reass0->sess_index == (u32) ~ 0)) + { + if (nat_ip4_reass_add_fragment + (reass0, bi0, &fragments_to_drop)) + { + b0->error = node->errors[NAT_OUT2IN_ED_ERROR_MAX_FRAG]; + nat_log_notice + ("maximum fragments per reassembly exceeded"); + next0 = NAT44_ED_OUT2IN_NEXT_DROP; + goto trace0; + } + cached0 = 1; + goto trace0; + } + s0 = pool_elt_at_index (per_thread_data->sessions, + reass0->sess_index); + } + + 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 */ ); + if (PREDICT_FALSE (is_twice_nat_session (s0))) + sum0 = ip_csum_update (sum0, ip0->src_address.as_u32, + s0->ext_host_nat_addr.as_u32, ip4_header_t, + src_address); + ip0->checksum = ip_csum_fold (sum0); + + if (PREDICT_FALSE (ip4_is_first_fragment (ip0))) + { + if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP)) + { + old_port0 = tcp0->dst_port; + tcp0->dst_port = s0->in2out.port; + new_port0 = tcp0->dst_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 */ ); + if (is_twice_nat_session (s0)) + { + sum0 = ip_csum_update (sum0, ip0->src_address.as_u32, + s0->ext_host_nat_addr.as_u32, + ip4_header_t, dst_address); + sum0 = ip_csum_update (sum0, tcp0->src_port, + s0->ext_host_nat_port, + ip4_header_t, length); + tcp0->src_port = s0->ext_host_nat_port; + ip0->src_address.as_u32 = s0->ext_host_nat_addr.as_u32; + } + tcp0->checksum = ip_csum_fold (sum0); + } + else + { + old_port0 = udp0->dst_port; + udp0->dst_port = s0->in2out.port; + if (is_twice_nat_session (s0)) + { + udp0->src_port = s0->ext_host_nat_port; + ip0->src_address.as_u32 = s0->ext_host_nat_addr.as_u32; + } + udp0->checksum = 0; + } + } + + /* Accounting */ + nat44_session_update_counters (s0, now, + vlib_buffer_length_in_chain (vm, + b0)); + + trace0: + if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) + && (b0->flags & VLIB_BUFFER_IS_TRACED))) + { + nat44_reass_trace_t *t = + vlib_add_trace (vm, node, b0, sizeof (*t)); + t->cached = cached0; + t->sw_if_index = sw_if_index0; + t->next_index = next0; + } + + if (cached0) + { + n_left_to_next++; + to_next--; + } + else + { + pkts_processed += next0 != NAT44_ED_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); + } + + if (n_left_from == 0 && vec_len (fragments_to_loopback)) + { + from = vlib_frame_vector_args (frame); + u32 len = vec_len (fragments_to_loopback); + if (len <= VLIB_FRAME_SIZE) + { + clib_memcpy (from, fragments_to_loopback, + sizeof (u32) * len); + n_left_from = len; + vec_reset_length (fragments_to_loopback); + } + else + { + clib_memcpy (from, + fragments_to_loopback + (len - + VLIB_FRAME_SIZE), + sizeof (u32) * VLIB_FRAME_SIZE); + n_left_from = VLIB_FRAME_SIZE; + _vec_len (fragments_to_loopback) = len - VLIB_FRAME_SIZE; + } + } + } + + vlib_put_next_frame (vm, node, next_index, n_left_to_next); + } + + vlib_node_increment_counter (vm, nat44_ed_out2in_reass_node.index, + NAT_OUT2IN_ED_ERROR_OUT2IN_PACKETS, + pkts_processed); + + nat_send_all_to_node (vm, fragments_to_drop, node, + &node->errors[NAT_OUT2IN_ED_ERROR_DROP_FRAGMENT], + NAT44_ED_OUT2IN_NEXT_DROP); + + vec_free (fragments_to_drop); + vec_free (fragments_to_loopback); + return frame->n_vectors; +} + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (nat44_ed_out2in_reass_node) = { + .function = nat44_ed_out2in_reass_node_fn, + .name = "nat44-ed-out2in-reass", + .vector_size = sizeof (u32), + .format_trace = format_nat44_reass_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + .n_errors = ARRAY_LEN(nat_out2in_ed_error_strings), + .error_strings = nat_out2in_ed_error_strings, + .n_next_nodes = NAT44_ED_OUT2IN_N_NEXT, + .next_nodes = { + [NAT44_ED_OUT2IN_NEXT_DROP] = "error-drop", + [NAT44_ED_OUT2IN_NEXT_LOOKUP] = "ip4-lookup", + [NAT44_ED_OUT2IN_NEXT_SLOW_PATH] = "nat44-ed-out2in-slowpath", + [NAT44_ED_OUT2IN_NEXT_ICMP_ERROR] = "ip4-icmp-error", + [NAT44_ED_OUT2IN_NEXT_IN2OUT] = "nat44-ed-in2out", + [NAT44_ED_OUT2IN_NEXT_REASS] = "nat44-ed-out2in-reass", + }, +}; +/* *INDENT-ON* */ + +VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_out2in_reass_node, + nat44_ed_out2in_reass_node_fn); + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |