diff options
author | ShivaShankarK <shivaashankar1204@gmail.com> | 2020-04-14 14:01:03 +0530 |
---|---|---|
committer | Neale Ranns <nranns@cisco.com> | 2020-04-24 07:37:20 +0000 |
commit | 0546483ce0b16acb82807aab290ff203e961b23a (patch) | |
tree | 6895dee993862e91da0ef0e7ee550b053756bf79 /src/vnet | |
parent | b5c0d35f9445d4d99f2c5c7bd3175e68721a8ee5 (diff) |
ipsec: add input node bypass/discard functionality
add bypass/discard functionality to ipsec4-input-feature node
Type: feature
Signed-off-by: ShivaShankarK <shivaashankar1204@gmail.com>
Change-Id: I152a5dfee0296109cccabe349a330dbbe395cc6c
Diffstat (limited to 'src/vnet')
-rw-r--r-- | src/vnet/ipsec/ipsec_input.c | 419 | ||||
-rw-r--r-- | src/vnet/ipsec/ipsec_spd.h | 4 | ||||
-rw-r--r-- | src/vnet/ipsec/ipsec_spd_policy.c | 4 |
3 files changed, 263 insertions, 164 deletions
diff --git a/src/vnet/ipsec/ipsec_input.c b/src/vnet/ipsec/ipsec_input.c index 61b10fb9db6..aa7627d9b4b 100644 --- a/src/vnet/ipsec/ipsec_input.c +++ b/src/vnet/ipsec/ipsec_input.c @@ -25,9 +25,12 @@ #include <vnet/ipsec/ah.h> #include <vnet/ipsec/ipsec_io.h> -#define foreach_ipsec_input_error \ -_(RX_PKTS, "IPSEC pkts received") \ -_(RX_MATCH_PKTS, "IPSEC pkts matched") +#define foreach_ipsec_input_error \ +_(RX_PKTS, "IPSec pkts received") \ +_(RX_POLICY_MATCH, "IPSec policy match") \ +_(RX_POLICY_NO_MATCH, "IPSec policy not matched") \ +_(RX_POLICY_BYPASS, "IPSec policy bypass") \ +_(RX_POLICY_DISCARD, "IPSec policy discard") typedef enum { @@ -69,6 +72,35 @@ format_ipsec_input_trace (u8 * s, va_list * args) } always_inline ipsec_policy_t * +ipsec_input_policy_match (ipsec_spd_t * spd, u32 sa, u32 da, + ipsec_spd_policy_type_t policy_type) +{ + ipsec_main_t *im = &ipsec_main; + ipsec_policy_t *p; + u32 *i; + + vec_foreach (i, spd->policies[policy_type]) + { + p = pool_elt_at_index (im->policies, *i); + + 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 ipsec_policy_t * ipsec_input_protect_policy_match (ipsec_spd_t * spd, u32 sa, u32 da, u32 spi) { ipsec_main_t *im = &ipsec_main; @@ -166,200 +198,261 @@ extern vlib_node_registration_t ipsec4_input_node; VLIB_NODE_FN (ipsec4_input_node) (vlib_main_t * vm, vlib_node_runtime_t * node, - vlib_frame_t * from_frame) + vlib_frame_t * frame) { - u32 n_left_from, *from, next_index, *to_next, thread_index; + u32 n_left_from, *from, thread_index; ipsec_main_t *im = &ipsec_main; - u32 ipsec_unprocessed = 0; - u32 ipsec_matched = 0; - - from = vlib_frame_vector_args (from_frame); - n_left_from = from_frame->n_vectors; + u64 ipsec_unprocessed = 0, ipsec_matched = 0; + u64 ipsec_dropped = 0, ipsec_bypassed = 0; + vlib_buffer_t *bufs[VLIB_FRAME_SIZE]; + vlib_buffer_t **b = bufs; + u16 nexts[VLIB_FRAME_SIZE], *next; + + from = vlib_frame_vector_args (frame); + n_left_from = frame->n_vectors; + next = nexts; + vlib_get_buffers (vm, from, bufs, n_left_from); thread_index = vm->thread_index; - 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 next32, pi0; + ip4_header_t *ip0; + esp_header_t *esp0 = NULL; + ah_header_t *ah0; + ip4_ipsec_config_t *c0; + ipsec_spd_t *spd0; + ipsec_policy_t *p0 = NULL; + u8 has_space0; + + if (n_left_from > 2) { - u32 bi0, next0, pi0; - vlib_buffer_t *b0; - ip4_header_t *ip0; - esp_header_t *esp0; - ah_header_t *ah0; - ip4_ipsec_config_t *c0; - ipsec_spd_t *spd0; - ipsec_policy_t *p0 = 0; - u8 has_space0; + vlib_prefetch_buffer_data (b[1], LOAD); + } - bi0 = to_next[0] = from[0]; - from += 1; - n_left_from -= 1; - to_next += 1; - n_left_to_next -= 1; + b[0]->flags |= VNET_BUFFER_F_IS_IP4; + b[0]->flags &= ~VNET_BUFFER_F_IS_IP6; + c0 = vnet_feature_next_with_data (&next32, b[0], sizeof (c0[0])); + next[0] = (u16) next32; - b0 = vlib_get_buffer (vm, bi0); - b0->flags |= VNET_BUFFER_F_IS_IP4; - b0->flags &= ~VNET_BUFFER_F_IS_IP6; - c0 = vnet_feature_next_with_data (&next0, b0, sizeof (c0[0])); + spd0 = pool_elt_at_index (im->spds, c0->spd_index); - spd0 = pool_elt_at_index (im->spds, c0->spd_index); + ip0 = vlib_buffer_get_current (b[0]); - ip0 = vlib_buffer_get_current (b0); + if (PREDICT_TRUE + (ip0->protocol == IP_PROTOCOL_IPSEC_ESP + || ip0->protocol == IP_PROTOCOL_UDP)) + { - if (PREDICT_TRUE - (ip0->protocol == IP_PROTOCOL_IPSEC_ESP - || ip0->protocol == IP_PROTOCOL_UDP)) + esp0 = (esp_header_t *) ((u8 *) ip0 + ip4_header_bytes (ip0)); + if (PREDICT_FALSE (ip0->protocol == IP_PROTOCOL_UDP)) { -#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 + /* FIXME Skip, if not a UDP encapsulated packet */ + esp0 = (esp_header_t *) ((u8 *) esp0 + sizeof (udp_header_t)); + } - esp0 = (esp_header_t *) ((u8 *) ip0 + ip4_header_bytes (ip0)); - if (PREDICT_FALSE (ip0->protocol == IP_PROTOCOL_UDP)) - { - esp0 = - (esp_header_t *) ((u8 *) esp0 + sizeof (udp_header_t)); - } + 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)); - 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)); - - has_space0 = - vlib_buffer_has_space (b0, - (clib_address_t) (esp0 + 1) - - (clib_address_t) ip0); - - if (PREDICT_TRUE ((p0 != NULL) & (has_space0))) - { - ipsec_matched += 1; + has_space0 = + vlib_buffer_has_space (b[0], + (clib_address_t) (esp0 + 1) - + (clib_address_t) ip0); - pi0 = p0 - im->policies; - vlib_increment_combined_counter - (&ipsec_spd_policy_counters, - thread_index, pi0, 1, - clib_net_to_host_u16 (ip0->length)); + if (PREDICT_TRUE ((p0 != NULL) & (has_space0))) + { + ipsec_matched += 1; - vnet_buffer (b0)->ipsec.sad_index = p0->sa_index; - next0 = im->esp4_decrypt_next_index; - vlib_buffer_advance (b0, ((u8 *) esp0 - (u8 *) ip0)); - goto trace0; - } - else - { - p0 = 0; - pi0 = ~0; - }; + pi0 = p0 - im->policies; + vlib_increment_combined_counter + (&ipsec_spd_policy_counters, + thread_index, pi0, 1, clib_net_to_host_u16 (ip0->length)); - /* FIXME bypass and discard */ - trace0: - if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE) && - PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) - { - ipsec_input_trace_t *tr = - vlib_add_trace (vm, node, b0, sizeof (*tr)); - - tr->proto = ip0->protocol; - tr->sa_id = p0 ? p0->sa_id : ~0; - tr->spi = - has_space0 ? clib_net_to_host_u32 (esp0->spi) : ~0; - tr->seq = - has_space0 ? clib_net_to_host_u32 (esp0->seq) : ~0; - tr->spd = spd0->id; - tr->policy_index = pi0; - } + vnet_buffer (b[0])->ipsec.sad_index = p0->sa_index; + next[0] = im->esp4_decrypt_next_index; + vlib_buffer_advance (b[0], ((u8 *) esp0 - (u8 *) ip0)); + goto trace0; } - else if (ip0->protocol == IP_PROTOCOL_IPSEC_AH) + else { - ah0 = (ah_header_t *) ((u8 *) ip0 + ip4_header_bytes (ip0)); - 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 - (ah0->spi)); - - has_space0 = - vlib_buffer_has_space (b0, - (clib_address_t) (ah0 + 1) - - (clib_address_t) ip0); - - if (PREDICT_TRUE ((p0 != NULL) & (has_space0))) - { - ipsec_matched += 1; + p0 = 0; + pi0 = ~0; + }; + + p0 = ipsec_input_policy_match (spd0, + clib_net_to_host_u32 + (ip0->src_address.as_u32), + clib_net_to_host_u32 + (ip0->dst_address.as_u32), + IPSEC_SPD_POLICY_IP4_INBOUND_BYPASS); + if (PREDICT_TRUE ((p0 != NULL))) + { + ipsec_bypassed += 1; + pi0 = p0 - im->policies; + goto trace0; + } + else + { + p0 = 0; + pi0 = ~0; + }; + + p0 = ipsec_input_policy_match (spd0, + clib_net_to_host_u32 + (ip0->src_address.as_u32), + clib_net_to_host_u32 + (ip0->dst_address.as_u32), + IPSEC_SPD_POLICY_IP4_INBOUND_DISCARD); + if (PREDICT_TRUE ((p0 != NULL))) + { + ipsec_dropped += 1; + pi0 = p0 - im->policies; + next[0] = IPSEC_INPUT_NEXT_DROP; + goto trace0; + } + else + { + p0 = 0; + pi0 = ~0; + }; + trace0: + if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE) && + PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED)) + { + ipsec_input_trace_t *tr = + vlib_add_trace (vm, node, b[0], sizeof (*tr)); - pi0 = p0 - im->policies; - vlib_increment_combined_counter - (&ipsec_spd_policy_counters, - thread_index, pi0, 1, - clib_net_to_host_u16 (ip0->length)); + tr->proto = ip0->protocol; + tr->sa_id = p0 ? p0->sa_id : ~0; + tr->spi = has_space0 ? clib_net_to_host_u32 (esp0->spi) : ~0; + tr->seq = has_space0 ? clib_net_to_host_u32 (esp0->seq) : ~0; + tr->spd = spd0->id; + tr->policy_index = pi0; + } + } + else if (ip0->protocol == IP_PROTOCOL_IPSEC_AH) + { + ah0 = (ah_header_t *) ((u8 *) ip0 + ip4_header_bytes (ip0)); + 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 + (ah0->spi)); + + has_space0 = + vlib_buffer_has_space (b[0], + (clib_address_t) (ah0 + 1) - + (clib_address_t) ip0); + + if (PREDICT_TRUE ((p0 != NULL) & (has_space0))) + { + ipsec_matched += 1; - vnet_buffer (b0)->ipsec.sad_index = p0->sa_index; - next0 = im->ah4_decrypt_next_index; - goto trace1; - } - else - { - p0 = 0; - pi0 = ~0; - } - /* FIXME bypass and discard */ - trace1: - if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE) && - PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) - { - ipsec_input_trace_t *tr = - vlib_add_trace (vm, node, b0, sizeof (*tr)); - - tr->proto = ip0->protocol; - tr->sa_id = p0 ? p0->sa_id : ~0; - tr->spi = has_space0 ? clib_net_to_host_u32 (ah0->spi) : ~0; - tr->seq = - has_space0 ? clib_net_to_host_u32 (ah0->seq_no) : ~0; - tr->spd = spd0->id; - tr->policy_index = pi0; - } + pi0 = p0 - im->policies; + vlib_increment_combined_counter + (&ipsec_spd_policy_counters, + thread_index, pi0, 1, clib_net_to_host_u16 (ip0->length)); + + vnet_buffer (b[0])->ipsec.sad_index = p0->sa_index; + next[0] = im->ah4_decrypt_next_index; + goto trace1; } else { - ipsec_unprocessed += 1; + p0 = 0; + pi0 = ~0; + } + + p0 = ipsec_input_policy_match (spd0, + clib_net_to_host_u32 + (ip0->src_address.as_u32), + clib_net_to_host_u32 + (ip0->dst_address.as_u32), + IPSEC_SPD_POLICY_IP4_INBOUND_BYPASS); + if (PREDICT_TRUE ((p0 != NULL))) + { + ipsec_bypassed += 1; + pi0 = p0 - im->policies; + goto trace1; + } + else + { + p0 = 0; + pi0 = ~0; + }; + + p0 = ipsec_input_policy_match (spd0, + clib_net_to_host_u32 + (ip0->src_address.as_u32), + clib_net_to_host_u32 + (ip0->dst_address.as_u32), + IPSEC_SPD_POLICY_IP4_INBOUND_DISCARD); + if (PREDICT_TRUE ((p0 != NULL))) + { + ipsec_dropped += 1; + pi0 = p0 - im->policies; + next[0] = IPSEC_INPUT_NEXT_DROP; + goto trace1; } + else + { + p0 = 0; + pi0 = ~0; + }; + trace1: + if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE) && + PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED)) + { + ipsec_input_trace_t *tr = + vlib_add_trace (vm, node, b[0], sizeof (*tr)); - vlib_validate_buffer_enqueue_x1 (vm, node, next_index, - to_next, n_left_to_next, bi0, - next0); + tr->proto = ip0->protocol; + tr->sa_id = p0 ? p0->sa_id : ~0; + tr->spi = has_space0 ? clib_net_to_host_u32 (ah0->spi) : ~0; + tr->seq = has_space0 ? clib_net_to_host_u32 (ah0->seq_no) : ~0; + tr->spd = spd0->id; + tr->policy_index = pi0; + } } - vlib_put_next_frame (vm, node, next_index, n_left_to_next); + else + { + ipsec_unprocessed += 1; + } + n_left_from -= 1; + b += 1; + next += 1; } + vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors); + vlib_node_increment_counter (vm, ipsec4_input_node.index, - IPSEC_INPUT_ERROR_RX_PKTS, - from_frame->n_vectors - ipsec_unprocessed); + IPSEC_INPUT_ERROR_RX_PKTS, frame->n_vectors); vlib_node_increment_counter (vm, ipsec4_input_node.index, - IPSEC_INPUT_ERROR_RX_MATCH_PKTS, + IPSEC_INPUT_ERROR_RX_POLICY_MATCH, ipsec_matched); - return from_frame->n_vectors; + + vlib_node_increment_counter (vm, ipsec4_input_node.index, + IPSEC_INPUT_ERROR_RX_POLICY_NO_MATCH, + ipsec_unprocessed); + + vlib_node_increment_counter (vm, ipsec4_input_node.index, + IPSEC_INPUT_ERROR_RX_POLICY_DISCARD, + ipsec_dropped); + + vlib_node_increment_counter (vm, ipsec4_input_node.index, + IPSEC_INPUT_ERROR_RX_POLICY_BYPASS, + ipsec_bypassed); + + return frame->n_vectors; } @@ -528,7 +621,7 @@ VLIB_NODE_FN (ipsec6_input_node) (vlib_main_t * vm, from_frame->n_vectors - ipsec_unprocessed); vlib_node_increment_counter (vm, ipsec6_input_node.index, - IPSEC_INPUT_ERROR_RX_MATCH_PKTS, + IPSEC_INPUT_ERROR_RX_POLICY_MATCH, ipsec_matched); return from_frame->n_vectors; diff --git a/src/vnet/ipsec/ipsec_spd.h b/src/vnet/ipsec/ipsec_spd.h index 1e6c2c3bc90..3637c27287d 100644 --- a/src/vnet/ipsec/ipsec_spd.h +++ b/src/vnet/ipsec/ipsec_spd.h @@ -23,7 +23,9 @@ _(IP4_INBOUND_PROTECT, "ip4-inbound-protect") \ _(IP6_INBOUND_PROTECT, "ip6-inbound-protect") \ _(IP4_INBOUND_BYPASS, "ip4-inbound-bypass") \ - _(IP6_INBOUND_BYPASS, "ip6-inbound-bypass") + _(IP6_INBOUND_BYPASS, "ip6-inbound-bypass") \ + _(IP4_INBOUND_DISCARD, "ip4-inbound-discard") \ + _(IP6_INBOUND_DISCARD, "ip6-inbound-discard") typedef enum ipsec_spd_policy_t_ { diff --git a/src/vnet/ipsec/ipsec_spd_policy.c b/src/vnet/ipsec/ipsec_spd_policy.c index 6424210b4e3..05cfdf0a671 100644 --- a/src/vnet/ipsec/ipsec_spd_policy.c +++ b/src/vnet/ipsec/ipsec_spd_policy.c @@ -123,6 +123,10 @@ ipsec_policy_mk_type (bool is_outbound, IPSEC_SPD_POLICY_IP4_INBOUND_BYPASS); return (0); case IPSEC_POLICY_ACTION_DISCARD: + *type = (is_ipv6 ? + IPSEC_SPD_POLICY_IP6_INBOUND_DISCARD : + IPSEC_SPD_POLICY_IP4_INBOUND_DISCARD); + return (0); case IPSEC_POLICY_ACTION_RESOLVE: break; } |