diff options
Diffstat (limited to 'src/plugins/nat/nat66/nat66_in2out.c')
| -rw-r--r-- | src/plugins/nat/nat66/nat66_in2out.c | 262 |
1 files changed, 262 insertions, 0 deletions
diff --git a/src/plugins/nat/nat66/nat66_in2out.c b/src/plugins/nat/nat66/nat66_in2out.c new file mode 100644 index 00000000000..5a027e2cd50 --- /dev/null +++ b/src/plugins/nat/nat66/nat66_in2out.c @@ -0,0 +1,262 @@ +/* + * 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 NAT66 inside to outside network translation + */ + +#include <nat/nat66/nat66.h> +#include <vnet/ip/ip6_to_ip4.h> +#include <vnet/fib/fib_table.h> + +typedef struct +{ + u32 sw_if_index; + u32 next_index; +} nat66_in2out_trace_t; + +static u8 * +format_nat66_in2out_trace (u8 * s, va_list * args) +{ + CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); + CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); + nat66_in2out_trace_t *t = va_arg (*args, nat66_in2out_trace_t *); + + s = + format (s, "NAT66-in2out: sw_if_index %d, next index %d", t->sw_if_index, + t->next_index); + + return s; +} + +#define foreach_nat66_in2out_error \ +_(IN2OUT_PACKETS, "good in2out packets processed") \ +_(NO_TRANSLATION, "no translation") \ +_(UNKNOWN, "unknown") + +typedef enum +{ +#define _(sym,str) NAT66_IN2OUT_ERROR_##sym, + foreach_nat66_in2out_error +#undef _ + NAT66_IN2OUT_N_ERROR, +} nat66_in2out_error_t; + +static char *nat66_in2out_error_strings[] = { +#define _(sym,string) string, + foreach_nat66_in2out_error +#undef _ +}; + +typedef enum +{ + NAT66_IN2OUT_NEXT_IP6_LOOKUP, + NAT66_IN2OUT_NEXT_DROP, + NAT66_IN2OUT_N_NEXT, +} nat66_in2out_next_t; + +static inline u8 +nat66_not_translate (u32 rx_fib_index, ip6_address_t ip6_addr) +{ + nat66_main_t *nm = &nat66_main; + u32 sw_if_index; + nat66_interface_t *i; + fib_node_index_t fei = FIB_NODE_INDEX_INVALID; + fib_prefix_t pfx = { + .fp_proto = FIB_PROTOCOL_IP6, + .fp_len = 128, + .fp_addr = { + .ip6 = ip6_addr, + }, + }; + + fei = fib_table_lookup (rx_fib_index, &pfx); + if (FIB_NODE_INDEX_INVALID == fei) + return 1; + sw_if_index = fib_entry_get_resolving_interface (fei); + + if (sw_if_index == ~0) + { + fei = fib_table_lookup (nm->outside_fib_index, &pfx); + if (FIB_NODE_INDEX_INVALID == fei) + return 1; + sw_if_index = fib_entry_get_resolving_interface (fei); + } + + /* *INDENT-OFF* */ + pool_foreach (i, nm->interfaces, + ({ + /* NAT packet aimed at outside interface */ + if (nat66_interface_is_outside (i) && sw_if_index == i->sw_if_index) + return 0; + })); + /* *INDENT-ON* */ + + return 1; +} + +VLIB_NODE_FN (nat66_in2out_node) (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + u32 n_left_from, *from, *to_next; + nat66_in2out_next_t next_index; + u32 pkts_processed = 0; + u32 thread_index = vm->thread_index; + nat66_main_t *nm = &nat66_main; + + 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 = NAT66_IN2OUT_NEXT_IP6_LOOKUP; + ip6_header_t *ip60; + u16 l4_offset0, frag_offset0; + u8 l4_protocol0; + nat66_static_mapping_t *sm0; + u32 sw_if_index0, fib_index0; + udp_header_t *udp0; + tcp_header_t *tcp0; + icmp46_header_t *icmp0; + u16 *checksum0 = 0; + ip_csum_t csum0; + + /* 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); + ip60 = vlib_buffer_get_current (b0); + + if (PREDICT_FALSE + (ip6_parse + (vm, b0, ip60, b0->current_length, &l4_protocol0, &l4_offset0, + &frag_offset0))) + { + next0 = NAT66_IN2OUT_NEXT_DROP; + b0->error = node->errors[NAT66_IN2OUT_ERROR_UNKNOWN]; + goto trace0; + } + + sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; + fib_index0 = + fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP6, + sw_if_index0); + + if (nat66_not_translate (fib_index0, ip60->dst_address)) + goto trace0; + + sm0 = nat66_static_mapping_get (&ip60->src_address, fib_index0, 1); + if (PREDICT_FALSE (!sm0)) + { + goto trace0; + } + + if (l4_protocol0 == IP_PROTOCOL_UDP) + { + udp0 = (udp_header_t *) u8_ptr_add (ip60, l4_offset0); + checksum0 = &udp0->checksum; + } + else if (l4_protocol0 == IP_PROTOCOL_TCP) + { + tcp0 = (tcp_header_t *) u8_ptr_add (ip60, l4_offset0); + checksum0 = &tcp0->checksum; + } + else if (l4_protocol0 == IP_PROTOCOL_ICMP6) + { + icmp0 = (icmp46_header_t *) u8_ptr_add (ip60, l4_offset0); + checksum0 = &icmp0->checksum; + } + else + goto skip_csum0; + + csum0 = ip_csum_sub_even (*checksum0, ip60->src_address.as_u64[0]); + csum0 = ip_csum_sub_even (csum0, ip60->src_address.as_u64[1]); + csum0 = ip_csum_add_even (csum0, sm0->e_addr.as_u64[0]); + csum0 = ip_csum_add_even (csum0, sm0->e_addr.as_u64[1]); + *checksum0 = ip_csum_fold (csum0); + + skip_csum0: + ip60->src_address.as_u64[0] = sm0->e_addr.as_u64[0]; + ip60->src_address.as_u64[1] = sm0->e_addr.as_u64[1]; + + vlib_increment_combined_counter (&nm->session_counters, + thread_index, sm0 - nm->sm, 1, + vlib_buffer_length_in_chain (vm, + b0)); + + trace0: + if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) + && (b0->flags & VLIB_BUFFER_IS_TRACED))) + { + nat66_in2out_trace_t *t = + vlib_add_trace (vm, node, b0, sizeof (*t)); + t->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX]; + t->next_index = next0; + } + + pkts_processed += next0 != NAT66_IN2OUT_NEXT_DROP; + + /* verify speculative enqueue, maybe switch current next frame */ + vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, + n_left_to_next, bi0, next0); + } + vlib_put_next_frame (vm, node, next_index, n_left_to_next); + } + + vlib_node_increment_counter (vm, nm->in2out_node_index, + NAT66_IN2OUT_ERROR_IN2OUT_PACKETS, + pkts_processed); + return frame->n_vectors; +} + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (nat66_in2out_node) = { + .name = "nat66-in2out", + .vector_size = sizeof (u32), + .format_trace = format_nat66_in2out_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + .n_errors = ARRAY_LEN (nat66_in2out_error_strings), + .error_strings = nat66_in2out_error_strings, + .n_next_nodes = NAT66_IN2OUT_N_NEXT, + /* edit / add dispositions here */ + .next_nodes = { + [NAT66_IN2OUT_NEXT_DROP] = "error-drop", + [NAT66_IN2OUT_NEXT_IP6_LOOKUP] = "ip6-lookup", + }, +}; +/* *INDENT-ON* */ + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |