diff options
Diffstat (limited to 'src/vnet/ipsec/ipsec_input.c')
| -rw-r--r-- | src/vnet/ipsec/ipsec_input.c | 430 |
1 files changed, 430 insertions, 0 deletions
diff --git a/src/vnet/ipsec/ipsec_input.c b/src/vnet/ipsec/ipsec_input.c new file mode 100644 index 00000000..f27058bb --- /dev/null +++ b/src/vnet/ipsec/ipsec_input.c @@ -0,0 +1,430 @@ +/* + * decap.c : IPSec tunnel decapsulation + * + * 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/feature/feature.h> + +#include <vnet/ipsec/ipsec.h> +#include <vnet/ipsec/esp.h> + +#define foreach_ipsec_input_error \ + _(RX_PKTS, "IPSEC pkts received") \ + _(DECRYPTION_FAILED, "IPSEC decryption failed") + +typedef enum +{ +#define _(sym,str) IPSEC_INPUT_ERROR_##sym, + foreach_ipsec_input_error +#undef _ + IPSEC_INPUT_N_ERROR, +} ipsec_input_error_t; + +static char *ipsec_input_error_strings[] = { +#define _(sym,string) string, + foreach_ipsec_input_error +#undef _ +}; + +typedef struct +{ + u32 sa_id; + u32 spi; + u32 seq; +} ipsec_input_trace_t; + +/* packet trace format function */ +static u8 * +format_ipsec_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_input_trace_t *t = va_arg (*args, ipsec_input_trace_t *); + + if (t->spi == 0 && t->seq == 0) + { + s = format (s, "esp: no esp packet"); + return s; + } + + if (t->sa_id != 0) + { + s = format (s, "esp: sa_id %u spi %u seq %u", t->sa_id, t->spi, t->seq); + } + else + { + s = format (s, "esp: no sa spi %u seq %u", t->spi, t->seq); + } + return s; +} + +always_inline ipsec_policy_t * +ipsec_input_protect_policy_match (ipsec_spd_t * spd, u32 sa, u32 da, u32 spi) +{ + ipsec_main_t *im = &ipsec_main; + ipsec_policy_t *p; + ipsec_sa_t *s; + u32 *i; + + vec_foreach (i, spd->ipv4_inbound_protect_policy_indices) + { + p = pool_elt_at_index (spd->policies, *i); + s = pool_elt_at_index (im->sad, p->sa_index); + + if (spi != s->spi) + continue; + + if (s->is_tunnel) + { + if (da != clib_net_to_host_u32 (s->tunnel_dst_addr.ip4.as_u32)) + continue; + + if (sa != clib_net_to_host_u32 (s->tunnel_src_addr.ip4.as_u32)) + continue; + + return p; + } + + if (da < clib_net_to_host_u32 (p->laddr.start.ip4.as_u32)) + continue; + + if (da > clib_net_to_host_u32 (p->laddr.stop.ip4.as_u32)) + continue; + + if (sa < clib_net_to_host_u32 (p->raddr.start.ip4.as_u32)) + continue; + + if (sa > clib_net_to_host_u32 (p->raddr.stop.ip4.as_u32)) + continue; + + return p; + } + return 0; +} + +always_inline uword +ip6_addr_match_range (ip6_address_t * a, ip6_address_t * la, + ip6_address_t * ua) +{ + if ((memcmp (a->as_u64, la->as_u64, 2 * sizeof (u64)) >= 0) && + (memcmp (a->as_u64, ua->as_u64, 2 * sizeof (u64)) <= 0)) + return 1; + return 0; +} + +always_inline ipsec_policy_t * +ipsec_input_ip6_protect_policy_match (ipsec_spd_t * spd, + ip6_address_t * sa, + ip6_address_t * da, u32 spi) +{ + ipsec_main_t *im = &ipsec_main; + ipsec_policy_t *p; + ipsec_sa_t *s; + u32 *i; + + vec_foreach (i, spd->ipv6_inbound_protect_policy_indices) + { + p = pool_elt_at_index (spd->policies, *i); + s = pool_elt_at_index (im->sad, p->sa_index); + + if (spi != s->spi) + continue; + + if (s->is_tunnel) + { + if (!ip6_address_is_equal (sa, &s->tunnel_src_addr.ip6)) + continue; + + if (!ip6_address_is_equal (da, &s->tunnel_dst_addr.ip6)) + continue; + + return p; + } + + if (!ip6_addr_match_range (sa, &p->raddr.start.ip6, &p->raddr.stop.ip6)) + continue; + + if (!ip6_addr_match_range (da, &p->laddr.start.ip6, &p->laddr.stop.ip6)) + continue; + + return p; + } + return 0; +} + +static vlib_node_registration_t ipsec_input_ip4_node; + +static uword +ipsec_input_ip4_node_fn (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * from_frame) +{ + u32 n_left_from, *from, next_index, *to_next; + ipsec_main_t *im = &ipsec_main; + + from = vlib_frame_vector_args (from_frame); + n_left_from = 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, next0; + vlib_buffer_t *b0; + ip4_header_t *ip0; + esp_header_t *esp0; + ip4_ipsec_config_t *c0; + ipsec_spd_t *spd0; + ipsec_policy_t *p0 = 0; + + bi0 = to_next[0] = from[0]; + from += 1; + n_left_from -= 1; + to_next += 1; + n_left_to_next -= 1; + + b0 = vlib_get_buffer (vm, bi0); + c0 = + vnet_feature_next_with_data (vnet_buffer (b0)->sw_if_index + [VLIB_RX], &next0, b0, + sizeof (c0[0])); + + spd0 = pool_elt_at_index (im->spds, c0->spd_index); + + ip0 = vlib_buffer_get_current (b0); + esp0 = (esp_header_t *) ((u8 *) ip0 + ip4_header_bytes (ip0)); + + if (PREDICT_TRUE (ip0->protocol == IP_PROTOCOL_IPSEC_ESP)) + { +#if 0 + clib_warning + ("packet received from %U to %U spi %u size %u spd_id %u", + format_ip4_address, ip0->src_address.as_u8, + format_ip4_address, ip0->dst_address.as_u8, + clib_net_to_host_u32 (esp0->spi), + clib_net_to_host_u16 (ip0->length), spd0->id); +#endif + + p0 = ipsec_input_protect_policy_match (spd0, + clib_net_to_host_u32 + (ip0->src_address. + as_u32), + clib_net_to_host_u32 + (ip0->dst_address. + as_u32), + clib_net_to_host_u32 + (esp0->spi)); + + if (PREDICT_TRUE (p0 != 0)) + { + p0->counter.packets++; + p0->counter.bytes += clib_net_to_host_u16 (ip0->length); + vnet_buffer (b0)->ipsec.sad_index = p0->sa_index; + vnet_buffer (b0)->ipsec.flags = 0; + next0 = im->esp_decrypt_next_index; + vlib_buffer_advance (b0, ip4_header_bytes (ip0)); + goto trace0; + } + } + + /* FIXME bypass and discard */ + + trace0: + if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) + { + ipsec_input_trace_t *tr = + vlib_add_trace (vm, node, b0, sizeof (*tr)); + if (ip0->protocol == IP_PROTOCOL_IPSEC_ESP) + { + if (p0) + tr->sa_id = p0->sa_id; + tr->spi = clib_host_to_net_u32 (esp0->spi); + tr->seq = clib_host_to_net_u32 (esp0->seq); + } + } + + 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, ipsec_input_ip4_node.index, + IPSEC_INPUT_ERROR_RX_PKTS, + from_frame->n_vectors); + + return from_frame->n_vectors; +} + + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (ipsec_input_ip4_node,static) = { + .function = ipsec_input_ip4_node_fn, + .name = "ipsec-input-ip4", + .vector_size = sizeof (u32), + .format_trace = format_ipsec_input_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + + .n_errors = ARRAY_LEN(ipsec_input_error_strings), + .error_strings = ipsec_input_error_strings, + + .n_next_nodes = IPSEC_INPUT_N_NEXT, + .next_nodes = { +#define _(s,n) [IPSEC_INPUT_NEXT_##s] = n, + foreach_ipsec_input_next +#undef _ + }, +}; +/* *INDENT-ON* */ + +VLIB_NODE_FUNCTION_MULTIARCH (ipsec_input_ip4_node, ipsec_input_ip4_node_fn) + static vlib_node_registration_t ipsec_input_ip6_node; + + static uword + ipsec_input_ip6_node_fn (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * from_frame) +{ + u32 n_left_from, *from, next_index, *to_next; + ipsec_main_t *im = &ipsec_main; + + from = vlib_frame_vector_args (from_frame); + n_left_from = 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, next0; + vlib_buffer_t *b0; + ip6_header_t *ip0; + esp_header_t *esp0; + ip4_ipsec_config_t *c0; + ipsec_spd_t *spd0; + ipsec_policy_t *p0 = 0; + u32 header_size = sizeof (ip0[0]); + + bi0 = to_next[0] = from[0]; + from += 1; + n_left_from -= 1; + to_next += 1; + n_left_to_next -= 1; + + b0 = vlib_get_buffer (vm, bi0); + c0 = + vnet_feature_next_with_data (vnet_buffer (b0)->sw_if_index + [VLIB_RX], &next0, b0, + sizeof (c0[0])); + + spd0 = pool_elt_at_index (im->spds, c0->spd_index); + + ip0 = vlib_buffer_get_current (b0); + esp0 = (esp_header_t *) ((u8 *) ip0 + header_size); + + if (PREDICT_TRUE (ip0->protocol == IP_PROTOCOL_IPSEC_ESP)) + { +#if 0 + clib_warning + ("packet received from %U to %U spi %u size %u spd_id %u", + format_ip6_address, &ip0->src_address, format_ip6_address, + &ip0->dst_address, clib_net_to_host_u32 (esp0->spi), + clib_net_to_host_u16 (ip0->payload_length) + header_size, + spd0->id); +#endif + p0 = ipsec_input_ip6_protect_policy_match (spd0, + &ip0->src_address, + &ip0->dst_address, + clib_net_to_host_u32 + (esp0->spi)); + + if (PREDICT_TRUE (p0 != 0)) + { + p0->counter.packets++; + p0->counter.bytes += + clib_net_to_host_u16 (ip0->payload_length); + p0->counter.bytes += header_size; + vnet_buffer (b0)->ipsec.sad_index = p0->sa_index; + vnet_buffer (b0)->ipsec.flags = 0; + next0 = im->esp_decrypt_next_index; + vlib_buffer_advance (b0, header_size); + goto trace0; + } + } + + trace0: + if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) + { + ipsec_input_trace_t *tr = + vlib_add_trace (vm, node, b0, sizeof (*tr)); + if (ip0->protocol == IP_PROTOCOL_IPSEC_ESP) + { + if (p0) + tr->sa_id = p0->sa_id; + tr->spi = clib_host_to_net_u32 (esp0->spi); + tr->seq = clib_host_to_net_u32 (esp0->seq); + } + } + + 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, ipsec_input_ip6_node.index, + IPSEC_INPUT_ERROR_RX_PKTS, + from_frame->n_vectors); + + return from_frame->n_vectors; +} + + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (ipsec_input_ip6_node,static) = { + .function = ipsec_input_ip6_node_fn, + .name = "ipsec-input-ip6", + .vector_size = sizeof (u32), + .format_trace = format_ipsec_input_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + + .n_errors = ARRAY_LEN(ipsec_input_error_strings), + .error_strings = ipsec_input_error_strings, + + .sibling_of = "ipsec-input-ip4", +}; +/* *INDENT-ON* */ + +VLIB_NODE_FUNCTION_MULTIARCH (ipsec_input_ip6_node, ipsec_input_ip6_node_fn) +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |