diff options
Diffstat (limited to 'src/vnet/ipsec/ipsec_output.c')
| -rw-r--r-- | src/vnet/ipsec/ipsec_output.c | 478 |
1 files changed, 478 insertions, 0 deletions
diff --git a/src/vnet/ipsec/ipsec_output.c b/src/vnet/ipsec/ipsec_output.c new file mode 100644 index 00000000000..97977899132 --- /dev/null +++ b/src/vnet/ipsec/ipsec_output.c @@ -0,0 +1,478 @@ +/* + * ipsec_output.c : IPSec output 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> + +#if DPDK_CRYPTO==1 +#define ESP_NODE "dpdk-esp-encrypt" +#else +#define ESP_NODE "esp-encrypt" +#endif + +#if IPSEC > 0 + +#define foreach_ipsec_output_next \ +_(DROP, "error-drop") \ +_(ESP_ENCRYPT, ESP_NODE) + +#define _(v, s) IPSEC_OUTPUT_NEXT_##v, +typedef enum +{ + foreach_ipsec_output_next +#undef _ + IPSEC_OUTPUT_N_NEXT, +} ipsec_output_next_t; + + +#define foreach_ipsec_output_error \ + _(RX_PKTS, "IPSec pkts received") \ + _(POLICY_DISCARD, "IPSec policy discard") \ + _(POLICY_NO_MATCH, "IPSec policy (no match)") \ + _(POLICY_PROTECT, "IPSec policy protect") \ + _(POLICY_BYPASS, "IPSec policy bypass") \ + _(ENCAPS_FAILED, "IPSec encapsulation failed") + + +typedef enum +{ +#define _(sym,str) IPSEC_OUTPUT_ERROR_##sym, + foreach_ipsec_output_error +#undef _ + IPSEC_DECAP_N_ERROR, +} ipsec_output_error_t; + +static char *ipsec_output_error_strings[] = { +#define _(sym,string) string, + foreach_ipsec_output_error +#undef _ +}; + +static vlib_node_registration_t ipsec_output_ip4_node; +static vlib_node_registration_t ipsec_output_ip6_node; + +typedef struct +{ + u32 spd_id; +} ipsec_output_trace_t; + +/* packet trace format function */ +static u8 * +format_ipsec_output_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_output_trace_t *t = va_arg (*args, ipsec_output_trace_t *); + + if (t->spd_id != ~0) + { + s = format (s, "spd %u ", t->spd_id); + } + else + { + s = format (s, "no spd"); + } + return s; +} + +always_inline ipsec_policy_t * +ipsec_output_policy_match (ipsec_spd_t * spd, u8 pr, u32 la, u32 ra, u16 lp, + u16 rp) +{ + ipsec_policy_t *p; + u32 *i; + + if (!spd) + return 0; + + vec_foreach (i, spd->ipv4_outbound_policies) + { + p = pool_elt_at_index (spd->policies, *i); + if (PREDICT_FALSE (p->protocol && (p->protocol != pr))) + continue; + + if (la < clib_net_to_host_u32 (p->laddr.start.ip4.as_u32)) + continue; + + if (la > clib_net_to_host_u32 (p->laddr.stop.ip4.as_u32)) + continue; + + if (ra < clib_net_to_host_u32 (p->raddr.start.ip4.as_u32)) + continue; + + if (ra > clib_net_to_host_u32 (p->raddr.stop.ip4.as_u32)) + continue; + + if (PREDICT_FALSE ((pr != IP_PROTOCOL_TCP) && (pr != IP_PROTOCOL_UDP))) + return p; + + if (lp < p->lport.start) + continue; + + if (lp > p->lport.stop) + continue; + + if (rp < p->rport.start) + continue; + + if (rp > p->rport.stop) + 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_output_ip6_policy_match (ipsec_spd_t * spd, + ip6_address_t * la, + ip6_address_t * ra, u16 lp, u16 rp, u8 pr) +{ + ipsec_policy_t *p; + u32 *i; + + if (!spd) + return 0; + + vec_foreach (i, spd->ipv6_outbound_policies) + { + p = pool_elt_at_index (spd->policies, *i); + if (PREDICT_FALSE (p->protocol && (p->protocol != pr))) + continue; + + if (!ip6_addr_match_range (ra, &p->raddr.start.ip6, &p->raddr.stop.ip6)) + continue; + + if (!ip6_addr_match_range (la, &p->laddr.start.ip6, &p->laddr.stop.ip6)) + continue; + + if (PREDICT_FALSE ((pr != IP_PROTOCOL_TCP) && (pr != IP_PROTOCOL_UDP))) + return p; + + if (lp < p->lport.start) + continue; + + if (lp > p->lport.stop) + continue; + + if (rp < p->rport.start) + continue; + + if (rp > p->rport.stop) + continue; + + return p; + } + + return 0; +} + +static inline uword +ipsec_output_inline (vlib_main_t * vm, vlib_node_runtime_t * node, + vlib_frame_t * from_frame, int is_ipv6) +{ + ipsec_main_t *im = &ipsec_main; + + u32 *from, *to_next = 0; + u32 n_left_from, sw_if_index0, last_sw_if_index = (u32) ~ 0; + u32 next_node_index = (u32) ~ 0, last_next_node_index = (u32) ~ 0; + vlib_frame_t *f = 0; + u32 spd_index0 = ~0; + ipsec_spd_t *spd0 = 0; + u64 nc_protect = 0, nc_bypass = 0, nc_discard = 0, nc_nomatch = 0; + + from = vlib_frame_vector_args (from_frame); + n_left_from = from_frame->n_vectors; + + while (n_left_from > 0) + { + u32 bi0; + vlib_buffer_t *b0; + ipsec_policy_t *p0; + ip4_header_t *ip0; + ip6_header_t *ip6_0 = 0; + udp_header_t *udp0; + u32 iph_offset = 0; + + bi0 = from[0]; + b0 = vlib_get_buffer (vm, bi0); + sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_TX]; + iph_offset = vnet_buffer (b0)->ip.save_rewrite_length; + ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) + + iph_offset); + + /* lookup for SPD only if sw_if_index is changed */ + if (PREDICT_FALSE (last_sw_if_index != sw_if_index0)) + { + uword *p = hash_get (im->spd_index_by_sw_if_index, sw_if_index0); + ASSERT (p); + spd_index0 = p[0]; + spd0 = pool_elt_at_index (im->spds, spd_index0); + last_sw_if_index = sw_if_index0; + } + + if (is_ipv6) + { + ip6_0 = (ip6_header_t *) ((u8 *) vlib_buffer_get_current (b0) + + iph_offset); + + udp0 = ip6_next_header (ip6_0); +#if 0 + clib_warning + ("packet received from %U port %u to %U port %u spd_id %u", + format_ip6_address, &ip6_0->src_address, + clib_net_to_host_u16 (udp0->src_port), format_ip6_address, + &ip6_0->dst_address, clib_net_to_host_u16 (udp0->dst_port), + spd0->id); +#endif + + p0 = ipsec_output_ip6_policy_match (spd0, + &ip6_0->src_address, + &ip6_0->dst_address, + clib_net_to_host_u16 + (udp0->src_port), + clib_net_to_host_u16 + (udp0->dst_port), + ip6_0->protocol); + } + else + { + udp0 = (udp_header_t *) ((u8 *) ip0 + ip4_header_bytes (ip0)); + +#if 0 + clib_warning ("packet received from %U to %U port %u", + format_ip4_address, ip0->src_address.as_u8, + format_ip4_address, ip0->dst_address.as_u8, + clib_net_to_host_u16 (udp0->dst_port)); + clib_warning ("sw_if_index0 %u spd_index0 %u spd_id %u", + sw_if_index0, spd_index0, spd0->id); +#endif + + p0 = ipsec_output_policy_match (spd0, ip0->protocol, + clib_net_to_host_u32 + (ip0->src_address.as_u32), + clib_net_to_host_u32 + (ip0->dst_address.as_u32), + clib_net_to_host_u16 + (udp0->src_port), + clib_net_to_host_u16 + (udp0->dst_port)); + } + + if (PREDICT_TRUE (p0 != NULL)) + { + if (p0->policy == IPSEC_POLICY_ACTION_PROTECT) + { + nc_protect++; + next_node_index = im->esp_encrypt_node_index; + vnet_buffer (b0)->ipsec.sad_index = p0->sa_index; + vlib_buffer_advance (b0, iph_offset); + p0->counter.packets++; + if (is_ipv6) + { + p0->counter.bytes += + clib_net_to_host_u16 (ip6_0->payload_length); + p0->counter.bytes += sizeof (ip6_header_t); + } + else + { + p0->counter.bytes += clib_net_to_host_u16 (ip0->length); + } + } + else if (p0->policy == IPSEC_POLICY_ACTION_BYPASS) + { + nc_bypass++; + next_node_index = get_next_output_feature_node_index (b0, node); + p0->counter.packets++; + if (is_ipv6) + { + p0->counter.bytes += + clib_net_to_host_u16 (ip6_0->payload_length); + p0->counter.bytes += sizeof (ip6_header_t); + } + else + { + p0->counter.bytes += clib_net_to_host_u16 (ip0->length); + } + } + else + { + nc_discard++; + p0->counter.packets++; + if (is_ipv6) + { + p0->counter.bytes += + clib_net_to_host_u16 (ip6_0->payload_length); + p0->counter.bytes += sizeof (ip6_header_t); + } + else + { + p0->counter.bytes += clib_net_to_host_u16 (ip0->length); + } + next_node_index = im->error_drop_node_index; + } + } + else + { + nc_nomatch++; + next_node_index = im->error_drop_node_index; + } + + from += 1; + n_left_from -= 1; + + if (PREDICT_FALSE ((last_next_node_index != next_node_index) || f == 0)) + { + /* if this is not 1st frame */ + if (f) + vlib_put_frame_to_node (vm, last_next_node_index, f); + + last_next_node_index = next_node_index; + + f = vlib_get_frame_to_node (vm, next_node_index); + to_next = vlib_frame_vector_args (f); + } + + to_next[0] = bi0; + to_next += 1; + f->n_vectors++; + + if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) + { + ipsec_output_trace_t *tr = + vlib_add_trace (vm, node, b0, sizeof (*tr)); + if (spd0) + tr->spd_id = spd0->id; + } + } + + vlib_put_frame_to_node (vm, next_node_index, f); + vlib_node_increment_counter (vm, node->node_index, + IPSEC_OUTPUT_ERROR_POLICY_PROTECT, nc_protect); + vlib_node_increment_counter (vm, node->node_index, + IPSEC_OUTPUT_ERROR_POLICY_BYPASS, nc_bypass); + vlib_node_increment_counter (vm, node->node_index, + IPSEC_OUTPUT_ERROR_POLICY_DISCARD, nc_discard); + vlib_node_increment_counter (vm, node->node_index, + IPSEC_OUTPUT_ERROR_POLICY_NO_MATCH, + nc_nomatch); + return from_frame->n_vectors; +} + +static uword +ipsec_output_ip4_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + return ipsec_output_inline (vm, node, frame, 0); +} + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (ipsec_output_ip4_node,static) = { + .function = ipsec_output_ip4_node_fn, + .name = "ipsec-output-ip4", + .vector_size = sizeof (u32), + .format_trace = format_ipsec_output_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + + .n_errors = ARRAY_LEN(ipsec_output_error_strings), + .error_strings = ipsec_output_error_strings, + + .n_next_nodes = IPSEC_OUTPUT_N_NEXT, + .next_nodes = { +#define _(s,n) [IPSEC_OUTPUT_NEXT_##s] = n, + foreach_ipsec_output_next +#undef _ + }, +}; +/* *INDENT-ON* */ + +VLIB_NODE_FUNCTION_MULTIARCH (ipsec_output_ip4_node, ipsec_output_ip4_node_fn) + static uword + ipsec_output_ip6_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + return ipsec_output_inline (vm, node, frame, 1); +} + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (ipsec_output_ip6_node,static) = { + .function = ipsec_output_ip6_node_fn, + .name = "ipsec-output-ip6", + .vector_size = sizeof (u32), + .format_trace = format_ipsec_output_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + + .n_errors = ARRAY_LEN(ipsec_output_error_strings), + .error_strings = ipsec_output_error_strings, + + .n_next_nodes = IPSEC_OUTPUT_N_NEXT, + .next_nodes = { +#define _(s,n) [IPSEC_OUTPUT_NEXT_##s] = n, + foreach_ipsec_output_next +#undef _ + }, +}; +/* *INDENT-ON* */ + +VLIB_NODE_FUNCTION_MULTIARCH (ipsec_output_ip6_node, ipsec_output_ip6_node_fn) +#else /* IPSEC > 1 */ + +/* Dummy ipsec output node, in case when IPSec is disabled */ + +static uword +ipsec_output_node_fn (vlib_main_t * vm, + vlib_node_runtime_t * node, vlib_frame_t * frame) +{ + clib_warning ("IPSec disabled"); + return 0; +} + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (ipsec_output_node) = { + .vector_size = sizeof (u32), + .function = ipsec_output_node_fn, + .name = "ipsec-output-ip4", +}; + +VLIB_REGISTER_NODE (ipsec_output_node) = { + .vector_size = sizeof (u32), + .function = ipsec_output_node_fn, + .name = "ipsec-output-ip6", +}; +/* *INDENT-ON* */ +#endif + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |