| /* |
| * ipsec_if_in.c : IPSec interface input node |
| * |
| * Copyright (c) 2015 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 <vnet/vnet.h> |
| #include <vnet/api_errno.h> |
| #include <vnet/ip/ip.h> |
| |
| #include <vnet/ipsec/ipsec.h> |
| #include <vnet/ipsec/esp.h> |
| #include <vnet/ipsec/ipsec_io.h> |
| #include <vnet/ipsec/ipsec_punt.h> |
| |
| /* Statistics (not really errors) */ |
| #define foreach_ipsec_if_input_error \ |
| _(RX, "good packets received") \ |
| _(DISABLED, "ipsec packets received on disabled interface") \ |
| _(NO_TUNNEL, "no matching tunnel") \ |
| _(SPI_0, "SPI 0") |
| |
| static char *ipsec_if_input_error_strings[] = { |
| #define _(sym,string) string, |
| foreach_ipsec_if_input_error |
| #undef _ |
| }; |
| |
| typedef enum |
| { |
| #define _(sym,str) IPSEC_IF_INPUT_ERROR_##sym, |
| foreach_ipsec_if_input_error |
| #undef _ |
| IPSEC_IF_INPUT_N_ERROR, |
| } ipsec_if_input_error_t; |
| |
| |
| typedef struct |
| { |
| u32 spi; |
| u32 seq; |
| } ipsec_if_input_trace_t; |
| |
| static u8 * |
| format_ipsec_if_input_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 *); |
| ipsec_if_input_trace_t *t = va_arg (*args, ipsec_if_input_trace_t *); |
| |
| s = format (s, "IPSec: spi %u (0x%08x) seq %u", t->spi, t->spi, t->seq); |
| return s; |
| } |
| |
| always_inline u16 |
| ipsec_ip4_if_no_tunnel (vlib_node_runtime_t * node, |
| vlib_buffer_t * b, |
| const esp_header_t * esp, |
| const ip4_header_t * ip4, u16 offset) |
| { |
| if (PREDICT_FALSE (0 == esp->spi)) |
| { |
| b->error = node->errors[IPSEC_IF_INPUT_ERROR_SPI_0]; |
| b->punt_reason = |
| ipsec_punt_reason[(ip4->protocol == IP_PROTOCOL_UDP ? |
| IPSEC_PUNT_IP4_SPI_UDP_0 : |
| IPSEC_PUNT_IP4_NO_SUCH_TUNNEL)]; |
| } |
| else |
| { |
| b->error = node->errors[IPSEC_IF_INPUT_ERROR_NO_TUNNEL]; |
| b->punt_reason = ipsec_punt_reason[IPSEC_PUNT_IP4_NO_SUCH_TUNNEL]; |
| } |
| vlib_buffer_advance (b, -offset); |
| return IPSEC_INPUT_NEXT_PUNT; |
| } |
| |
| always_inline u16 |
| ipsec_ip6_if_no_tunnel (vlib_node_runtime_t * node, |
| vlib_buffer_t * b, |
| const esp_header_t * esp, u16 offset) |
| { |
| b->error = node->errors[IPSEC_IF_INPUT_ERROR_NO_TUNNEL]; |
| b->punt_reason = ipsec_punt_reason[IPSEC_PUNT_IP6_NO_SUCH_TUNNEL]; |
| |
| vlib_buffer_advance (b, -offset); |
| return (IPSEC_INPUT_NEXT_PUNT); |
| } |
| |
| always_inline uword |
| ipsec_if_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node, |
| vlib_frame_t * from_frame, int is_ip6) |
| { |
| ipsec_main_t *im = &ipsec_main; |
| vnet_main_t *vnm = im->vnet_main; |
| vnet_interface_main_t *vim = &vnm->interface_main; |
| |
| int is_trace = node->flags & VLIB_NODE_FLAG_TRACE; |
| u32 thread_index = vm->thread_index; |
| |
| u32 n_left_from, *from; |
| u16 nexts[VLIB_FRAME_SIZE], *next; |
| vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b; |
| |
| from = vlib_frame_vector_args (from_frame); |
| n_left_from = from_frame->n_vectors; |
| |
| vlib_get_buffers (vm, from, bufs, n_left_from); |
| b = bufs; |
| next = nexts; |
| |
| clib_memset_u16 (nexts, im->esp4_decrypt_next_index, n_left_from); |
| |
| u64 n_bytes = 0, n_packets = 0; |
| u32 n_disabled = 0, n_no_tunnel = 0; |
| |
| u32 last_sw_if_index = ~0; |
| u32 last_tunnel_id = ~0; |
| ipsec4_tunnel_key_t last_key4; |
| ipsec6_tunnel_key_t last_key6; |
| |
| vlib_combined_counter_main_t *rx_counter; |
| vlib_combined_counter_main_t *drop_counter; |
| |
| if (is_ip6) |
| clib_memset (&last_key6, 0xff, sizeof (last_key6)); |
| else |
| last_key4.as_u64 = ~0; |
| |
| rx_counter = vim->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX; |
| drop_counter = vim->combined_sw_if_counters + VNET_INTERFACE_COUNTER_DROP; |
| |
| while (n_left_from >= 2) |
| { |
| u32 sw_if_index0, sw_if_index1; |
| ip4_header_t *ip40, *ip41; |
| ip6_header_t *ip60, *ip61; |
| esp_header_t *esp0, *esp1; |
| u32 len0, len1; |
| u16 buf_adv0, buf_adv1; |
| u16 buf_rewind0, buf_rewind1; |
| u32 tid0, tid1; |
| ipsec_tunnel_if_t *t0, *t1; |
| ipsec4_tunnel_key_t key40, key41; |
| ipsec6_tunnel_key_t key60, key61; |
| |
| if (n_left_from >= 4) |
| { |
| CLIB_PREFETCH (b[2], CLIB_CACHE_LINE_BYTES, STORE); |
| CLIB_PREFETCH (b[2]->data, CLIB_CACHE_LINE_BYTES, LOAD); |
| CLIB_PREFETCH (b[3], CLIB_CACHE_LINE_BYTES, STORE); |
| CLIB_PREFETCH (b[3]->data, CLIB_CACHE_LINE_BYTES, LOAD); |
| } |
| |
| ip40 = |
| (ip4_header_t *) (b[0]->data + vnet_buffer (b[0])->l3_hdr_offset); |
| ip41 = |
| (ip4_header_t *) (b[1]->data + vnet_buffer (b[1])->l3_hdr_offset); |
| |
| if (is_ip6) |
| { |
| ip60 = (ip6_header_t *) ip40; |
| ip61 = (ip6_header_t *) ip41; |
| esp0 = (esp_header_t *) ((u8 *) ip60 + sizeof (ip6_header_t)); |
| esp1 = (esp_header_t *) ((u8 *) ip61 + sizeof (ip6_header_t)); |
| buf_adv0 = sizeof (ip6_header_t); |
| buf_adv1 = sizeof (ip6_header_t); |
| } |
| else |
| { |
| /* NAT UDP port 4500 case, don't advance any more */ |
| if (ip40->protocol == IP_PROTOCOL_UDP) |
| { |
| esp0 = |
| (esp_header_t *) ((u8 *) ip40 + ip4_header_bytes (ip40) + |
| sizeof (udp_header_t)); |
| buf_adv0 = 0; |
| buf_rewind0 = ip4_header_bytes (ip40) + sizeof (udp_header_t); |
| } |
| else |
| { |
| esp0 = (esp_header_t *) ((u8 *) ip40 + ip4_header_bytes (ip40)); |
| buf_rewind0 = buf_adv0 = ip4_header_bytes (ip40); |
| } |
| /* NAT UDP port 4500 case, don't advance any more */ |
| if (ip41->protocol == IP_PROTOCOL_UDP) |
| { |
| esp1 = |
| (esp_header_t *) ((u8 *) ip41 + ip4_header_bytes (ip41) + |
| sizeof (udp_header_t)); |
| buf_adv1 = 0; |
| buf_rewind1 = ip4_header_bytes (ip41) + sizeof (udp_header_t); |
| } |
| else |
| { |
| esp1 = (esp_header_t *) ((u8 *) ip41 + ip4_header_bytes (ip41)); |
| buf_rewind1 = buf_adv1 = ip4_header_bytes (ip41); |
| } |
| } |
| |
| vlib_buffer_advance (b[0], buf_adv0); |
| vlib_buffer_advance (b[1], buf_adv1); |
| |
| len0 = vlib_buffer_length_in_chain (vm, b[0]); |
| len1 = vlib_buffer_length_in_chain (vm, b[1]); |
| |
| if (is_ip6) |
| { |
| key60.remote_ip = ip60->src_address; |
| key60.spi = esp0->spi; |
| |
| if (memcmp (&key60, &last_key6, sizeof (last_key6)) == 0) |
| { |
| tid0 = last_tunnel_id; |
| } |
| else |
| { |
| uword *p = |
| hash_get_mem (im->ipsec6_if_pool_index_by_key, &key60); |
| if (p) |
| { |
| tid0 = p[0]; |
| last_tunnel_id = tid0; |
| clib_memcpy_fast (&last_key6, &key60, sizeof (key60)); |
| } |
| else |
| { |
| next[0] = |
| ipsec_ip6_if_no_tunnel (node, b[0], esp0, buf_adv0); |
| n_no_tunnel++; |
| goto pkt1; |
| } |
| } |
| } |
| else /* !is_ip6 */ |
| { |
| key40.remote_ip = ip40->src_address.as_u32; |
| key40.spi = esp0->spi; |
| |
| if (key40.as_u64 == last_key4.as_u64) |
| { |
| tid0 = last_tunnel_id; |
| } |
| else |
| { |
| uword *p = |
| hash_get (im->ipsec4_if_pool_index_by_key, key40.as_u64); |
| if (p) |
| { |
| tid0 = p[0]; |
| last_tunnel_id = tid0; |
| last_key4.as_u64 = key40.as_u64; |
| } |
| else |
| { |
| next[0] = |
| ipsec_ip4_if_no_tunnel (node, b[0], esp0, ip40, |
| buf_rewind0); |
| n_no_tunnel++; |
| goto pkt1; |
| } |
| } |
| } |
| |
| t0 = pool_elt_at_index (im->tunnel_interfaces, tid0); |
| vnet_buffer (b[0])->ipsec.sad_index = t0->input_sa_index; |
| |
| if (PREDICT_TRUE (t0->hw_if_index != ~0)) |
| { |
| sw_if_index0 = t0->sw_if_index; |
| vnet_buffer (b[0])->sw_if_index[VLIB_RX] = sw_if_index0; |
| |
| if (PREDICT_FALSE (!(t0->flags & VNET_HW_INTERFACE_FLAG_LINK_UP))) |
| { |
| vlib_increment_combined_counter |
| (drop_counter, thread_index, sw_if_index0, 1, len0); |
| n_disabled++; |
| b[0]->error = node->errors[IPSEC_IF_INPUT_ERROR_DISABLED]; |
| next[0] = IPSEC_INPUT_NEXT_DROP; |
| goto pkt1; |
| } |
| |
| if (PREDICT_TRUE (sw_if_index0 == last_sw_if_index)) |
| { |
| n_packets++; |
| n_bytes += len0; |
| } |
| else |
| { |
| if (n_packets) |
| { |
| vlib_increment_combined_counter |
| (rx_counter, thread_index, last_sw_if_index, |
| n_packets, n_bytes); |
| } |
| |
| last_sw_if_index = sw_if_index0; |
| n_packets = 1; |
| n_bytes = len0; |
| } |
| } |
| |
| pkt1: |
| if (is_ip6) |
| { |
| key61.remote_ip = ip61->src_address; |
| key61.spi = esp1->spi; |
| |
| if (memcmp (&key61, &last_key6, sizeof (last_key6)) == 0) |
| { |
| tid1 = last_tunnel_id; |
| } |
| else |
| { |
| uword *p = |
| hash_get_mem (im->ipsec6_if_pool_index_by_key, &key61); |
| if (p) |
| { |
| tid1 = p[0]; |
| last_tunnel_id = tid1; |
| clib_memcpy_fast (&last_key6, &key61, sizeof (key61)); |
| } |
| else |
| { |
| next[1] = |
| ipsec_ip6_if_no_tunnel (node, b[1], esp1, buf_adv1); |
| n_no_tunnel++; |
| goto trace1; |
| } |
| } |
| } |
| else /* !is_ip6 */ |
| { |
| key41.remote_ip = ip41->src_address.as_u32; |
| key41.spi = esp1->spi; |
| |
| if (key41.as_u64 == last_key4.as_u64) |
| { |
| tid1 = last_tunnel_id; |
| } |
| else |
| { |
| uword *p = |
| hash_get (im->ipsec4_if_pool_index_by_key, key41.as_u64); |
| if (p) |
| { |
| tid1 = p[0]; |
| last_tunnel_id = tid1; |
| last_key4.as_u64 = key41.as_u64; |
| } |
| else |
| { |
| next[1] = |
| ipsec_ip4_if_no_tunnel (node, b[1], esp1, ip41, |
| buf_rewind1); |
| n_no_tunnel++; |
| goto trace1; |
| } |
| } |
| } |
| |
| t1 = pool_elt_at_index (im->tunnel_interfaces, tid1); |
| vnet_buffer (b[1])->ipsec.sad_index = t1->input_sa_index; |
| |
| if (PREDICT_TRUE (t1->hw_if_index != ~0)) |
| { |
| sw_if_index1 = t1->sw_if_index; |
| vnet_buffer (b[1])->sw_if_index[VLIB_RX] = sw_if_index1; |
| |
| if (PREDICT_FALSE (!(t1->flags & VNET_HW_INTERFACE_FLAG_LINK_UP))) |
| { |
| vlib_increment_combined_counter |
| (drop_counter, thread_index, sw_if_index1, 1, len1); |
| n_disabled++; |
| b[1]->error = node->errors[IPSEC_IF_INPUT_ERROR_DISABLED]; |
| next[1] = IPSEC_INPUT_NEXT_DROP; |
| goto trace1; |
| } |
| |
| if (PREDICT_TRUE (sw_if_index1 == last_sw_if_index)) |
| { |
| n_packets++; |
| n_bytes += len1; |
| } |
| else |
| { |
| if (n_packets) |
| { |
| vlib_increment_combined_counter |
| (rx_counter, thread_index, last_sw_if_index, |
| n_packets, n_bytes); |
| } |
| |
| last_sw_if_index = sw_if_index1; |
| n_packets = 1; |
| n_bytes = len1; |
| } |
| } |
| |
| trace1: |
| if (PREDICT_FALSE (is_trace)) |
| { |
| if (b[0]->flags & VLIB_BUFFER_IS_TRACED) |
| { |
| ipsec_if_input_trace_t *tr = |
| vlib_add_trace (vm, node, b[0], sizeof (*tr)); |
| tr->spi = clib_host_to_net_u32 (esp0->spi); |
| tr->seq = clib_host_to_net_u32 (esp0->seq); |
| } |
| if (b[1]->flags & VLIB_BUFFER_IS_TRACED) |
| { |
| ipsec_if_input_trace_t *tr = |
| vlib_add_trace (vm, node, b[1], sizeof (*tr)); |
| tr->spi = clib_host_to_net_u32 (esp1->spi); |
| tr->seq = clib_host_to_net_u32 (esp1->seq); |
| } |
| } |
| |
| /* next */ |
| b += 2; |
| next += 2; |
| n_left_from -= 2; |
| } |
| while (n_left_from > 0) |
| { |
| u32 sw_if_index0; |
| ip4_header_t *ip40; |
| ip6_header_t *ip60; |
| esp_header_t *esp0; |
| u32 len0; |
| u16 buf_adv0, buf_rewind0; |
| u32 tid0; |
| ipsec_tunnel_if_t *t0; |
| ipsec4_tunnel_key_t key40; |
| ipsec6_tunnel_key_t key60; |
| |
| ip40 = |
| (ip4_header_t *) (b[0]->data + vnet_buffer (b[0])->l3_hdr_offset); |
| |
| if (is_ip6) |
| { |
| ip60 = (ip6_header_t *) ip40; |
| esp0 = (esp_header_t *) ((u8 *) ip60 + sizeof (ip6_header_t)); |
| buf_adv0 = sizeof (ip6_header_t); |
| } |
| else |
| { |
| /* NAT UDP port 4500 case, don't advance any more */ |
| if (ip40->protocol == IP_PROTOCOL_UDP) |
| { |
| esp0 = |
| (esp_header_t *) ((u8 *) ip40 + ip4_header_bytes (ip40) + |
| sizeof (udp_header_t)); |
| buf_adv0 = 0; |
| buf_rewind0 = ip4_header_bytes (ip40) + sizeof (udp_header_t); |
| } |
| else |
| { |
| esp0 = (esp_header_t *) ((u8 *) ip40 + ip4_header_bytes (ip40)); |
| buf_rewind0 = buf_adv0 = ip4_header_bytes (ip40); |
| } |
| } |
| |
| /* stats for the tunnel include all the data after the IP header |
| just like a norml IP-IP tunnel */ |
| vlib_buffer_advance (b[0], buf_adv0); |
| len0 = vlib_buffer_length_in_chain (vm, b[0]); |
| |
| if (is_ip6) |
| { |
| key60.remote_ip = ip60->src_address; |
| key60.spi = esp0->spi; |
| |
| if (memcmp (&key60, &last_key6, sizeof (last_key6)) == 0) |
| { |
| tid0 = last_tunnel_id; |
| } |
| else |
| { |
| uword *p = |
| hash_get_mem (im->ipsec6_if_pool_index_by_key, &key60); |
| if (p) |
| { |
| tid0 = p[0]; |
| last_tunnel_id = tid0; |
| clib_memcpy_fast (&last_key6, &key60, sizeof (key60)); |
| } |
| else |
| { |
| next[0] = |
| ipsec_ip6_if_no_tunnel (node, b[0], esp0, buf_adv0); |
| n_no_tunnel++; |
| goto trace00; |
| } |
| } |
| } |
| else /* !is_ip6 */ |
| { |
| key40.remote_ip = ip40->src_address.as_u32; |
| key40.spi = esp0->spi; |
| |
| if (key40.as_u64 == last_key4.as_u64) |
| { |
| tid0 = last_tunnel_id; |
| } |
| else |
| { |
| uword *p = |
| hash_get (im->ipsec4_if_pool_index_by_key, key40.as_u64); |
| if (p) |
| { |
| tid0 = p[0]; |
| last_tunnel_id = tid0; |
| last_key4.as_u64 = key40.as_u64; |
| } |
| else |
| { |
| next[0] = |
| ipsec_ip4_if_no_tunnel (node, b[0], esp0, ip40, |
| buf_rewind0); |
| n_no_tunnel++; |
| goto trace00; |
| } |
| } |
| } |
| |
| t0 = pool_elt_at_index (im->tunnel_interfaces, tid0); |
| vnet_buffer (b[0])->ipsec.sad_index = t0->input_sa_index; |
| |
| if (PREDICT_TRUE (t0->hw_if_index != ~0)) |
| { |
| sw_if_index0 = t0->sw_if_index; |
| vnet_buffer (b[0])->sw_if_index[VLIB_RX] = sw_if_index0; |
| |
| if (PREDICT_FALSE (!(t0->flags & VNET_HW_INTERFACE_FLAG_LINK_UP))) |
| { |
| vlib_increment_combined_counter |
| (drop_counter, thread_index, sw_if_index0, 1, len0); |
| n_disabled++; |
| b[0]->error = node->errors[IPSEC_IF_INPUT_ERROR_DISABLED]; |
| next[0] = IPSEC_INPUT_NEXT_DROP; |
| goto trace00; |
| } |
| |
| if (PREDICT_TRUE (sw_if_index0 == last_sw_if_index)) |
| { |
| n_packets++; |
| n_bytes += len0; |
| } |
| else |
| { |
| if (n_packets) |
| { |
| vlib_increment_combined_counter |
| (rx_counter, thread_index, last_sw_if_index, |
| n_packets, n_bytes); |
| } |
| |
| last_sw_if_index = sw_if_index0; |
| n_packets = 1; |
| n_bytes = len0; |
| } |
| } |
| |
| trace00: |
| if (PREDICT_FALSE (is_trace)) |
| { |
| if (b[0]->flags & VLIB_BUFFER_IS_TRACED) |
| { |
| ipsec_if_input_trace_t *tr = |
| vlib_add_trace (vm, node, b[0], sizeof (*tr)); |
| tr->spi = clib_host_to_net_u32 (esp0->spi); |
| tr->seq = clib_host_to_net_u32 (esp0->seq); |
| } |
| } |
| |
| /* next */ |
| b += 1; |
| next += 1; |
| n_left_from -= 1; |
| } |
| |
| if (n_packets) |
| { |
| vlib_increment_combined_counter (rx_counter, |
| thread_index, |
| last_sw_if_index, n_packets, n_bytes); |
| } |
| |
| vlib_node_increment_counter (vm, node->node_index, |
| IPSEC_IF_INPUT_ERROR_RX, |
| from_frame->n_vectors - (n_disabled + |
| n_no_tunnel)); |
| |
| vlib_buffer_enqueue_to_next (vm, node, from, nexts, from_frame->n_vectors); |
| |
| return from_frame->n_vectors; |
| } |
| |
| VLIB_NODE_FN (ipsec4_if_input_node) (vlib_main_t * vm, |
| vlib_node_runtime_t * node, |
| vlib_frame_t * from_frame) |
| { |
| return ipsec_if_input_inline (vm, node, from_frame, 0 /* is_ip6 */ ); |
| } |
| |
| /* *INDENT-OFF* */ |
| VLIB_REGISTER_NODE (ipsec4_if_input_node) = { |
| .name = "ipsec4-if-input", |
| .vector_size = sizeof (u32), |
| .format_trace = format_ipsec_if_input_trace, |
| .type = VLIB_NODE_TYPE_INTERNAL, |
| .n_errors = ARRAY_LEN(ipsec_if_input_error_strings), |
| .error_strings = ipsec_if_input_error_strings, |
| .sibling_of = "ipsec4-input-feature", |
| }; |
| /* *INDENT-ON* */ |
| |
| VLIB_NODE_FN (ipsec6_if_input_node) (vlib_main_t * vm, |
| vlib_node_runtime_t * node, |
| vlib_frame_t * from_frame) |
| { |
| return ipsec_if_input_inline (vm, node, from_frame, 1 /* is_ip6 */ ); |
| } |
| |
| /* *INDENT-OFF* */ |
| VLIB_REGISTER_NODE (ipsec6_if_input_node) = { |
| .name = "ipsec6-if-input", |
| .vector_size = sizeof (u32), |
| .format_trace = format_ipsec_if_input_trace, |
| .type = VLIB_NODE_TYPE_INTERNAL, |
| .n_errors = ARRAY_LEN(ipsec_if_input_error_strings), |
| .error_strings = ipsec_if_input_error_strings, |
| .sibling_of = "ipsec6-input-feature", |
| }; |
| /* *INDENT-ON* */ |
| |
| /* |
| * fd.io coding-style-patch-verification: ON |
| * |
| * Local Variables: |
| * eval: (c-set-style "gnu") |
| * End: |
| */ |