/*
* 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_spd_fp_lookup.h>
#include <vnet/ipsec/ipsec.h>
#include <vnet/ipsec/esp.h>
#include <vnet/ipsec/ah.h>
#include <vnet/ipsec/ipsec_io.h>
#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
{
#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
{
ip_protocol_t proto;
u32 spd;
u32 policy_index;
u32 policy_type;
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 *);
s =
format (s, "%U: sa_id %u type: %u spd %u policy %d spi %u (0x%08x) seq %u",
format_ip_protocol, t->proto, t->sa_id, t->policy_type, t->spd,
t->policy_index, t->spi, t->spi, t->seq);
return s;
}
always_inline void
ipsec4_input_spd_add_flow_cache_entry (ipsec_main_t *im, u32 sa, u32 da,
ipsec_spd_policy_type_t policy_type,
u32 pol_id)
{
u64 hash;
u8 is_overwrite = 0, is_stale_overwrite = 0;
/* Store in network byte order to avoid conversion on lookup */
ipsec4_inbound_spd_tuple_t ip4_tuple = {
.ip4_src_addr = (ip4_address_t) clib_host_to_net_u32 (sa),
.ip4_dest_addr = (ip4_address_t) clib_host_to_net_u32 (da),
.policy_type = policy_type
};
ip4_tuple.kv_16_8.value =
(((u64) pol_id) << 32) | ((u64) im->input_epoch_count);
hash = ipsec4_hash_16_8 (&ip4_tuple.kv_16_8);
hash &= (im->ipsec4_in_spd_hash_num_buckets - 1);
ipsec_spinlock_lock (&im->ipsec4_in_spd_hash_tbl[hash].bucket_lock);
/* Check if we are overwriting an existing entry so we know
whether to increment the flow cache counter. Since flow
cache counter is reset on any policy add/remove, but
hash table values are not, we need to check if the entry
we are overwriting is stale or not. If it's a stale entry
overwrite, we still want to increment flow cache counter */
is_overwrite = (im->ipsec4_in_spd_hash_tbl[hash].value != 0);
/* Check if we are overwriting a stale entry by comparing
with current epoch count */
if (PREDICT_FALSE (is_overwrite))
is_stale_overwrite =
(im->input_epoch_count !=
((u32) (im->ipsec4_in_spd_hash_tbl[hash].value & 0xFFFFFFFF)));
clib_memcpy_fast (&im->ipsec4_in_spd_hash_tbl[hash], &ip4_tuple.kv_16_8,
sizeof (ip4_tuple.kv_16_8));
ipsec_spinlock_unlock (&im->ipsec4_in_spd_hash_tbl[hash].bucket_lock);
/* Increment the counter to track active flow cache entries
when entering a fresh entry or overwriting a stale one */
if (!is_overwrite || is_stale_overwrite)
clib_atomic_fetch_add_relax (&im->ipsec4_in_spd_flow_cache_entries, 1);
return;
}
always_inline ipsec_policy_t *
ipsec4_input_spd_find_flow_cache_entry (ipsec_main_t *im, u32 sa, u32 da,
ipsec_spd_policy_type_t policy_type)
{
ipsec_policy_t *p = NULL;
ipsec4_hash_kv_16_8_t kv_result;
u64 hash;
ipsec4_inbound_spd_tuple_t ip4_tuple = { .ip4_src_addr = (ip4_address_t) sa,
.ip4_dest_addr = (ip4_address_t) da,
.policy_type = policy_type };
hash = ipsec4_hash_16_8 (&ip4_tuple.kv_16_8);
hash &= (im->ipsec4_in_spd_hash_num_buckets - 1);
ipsec_spinlock_lock (&im->ipsec4_in_spd_hash_tbl[hash].bucket_lock);
kv_result = im->ipsec4_in_spd_hash_tbl[hash];
ipsec_spinlock_unlock (&im->ipsec4_in_spd_hash_tbl[hash].bucket_lock);
if (ipsec4_hash_key_compare_16_8 ((u64 *) &ip4_tuple.kv_16_8,
(u64 *) &kv_result))
{
if (im->input_epoch_count == ((u32) (kv_result.value & 0xFFFFFFFF)))
{
/* Get the policy based on the index */
p =
pool_elt_at_index (im->policies, ((u32) (kv_result.value >> 32)));
}
}
return p;
}
always_inline void
ipsec_fp_in_5tuple_from_ip4_range (ipsec_fp_5tuple_t *tuple, u32 sa, u32 da,
u32 spi, u8 action)
{
clib_memset (tuple->l3_zero_pad, 0, sizeof (tuple->l3_zero_pad));
tuple->laddr.as_u32 = da;
tuple->raddr.as_u32 = sa;
tuple->spi = spi;
tuple->action = action;
tuple->is_ipv6 = 0;
}
always_inline void
ipsec_fp_in_5tuple_from_ip6_range (ipsec_fp_5tuple_t *tuple, ip6_address_t *sa,
ip6_address_t *da, u32 spi, u8 action)
{
clib_memcpy (&tuple->ip6_laddr, da, sizeof (ip6_address_t));
clib_memcpy (&tuple->ip6_raddr, sa, sizeof (ip6_address_t));
tuple->spi = spi;
tuple->action = action;
tuple->is_ipv6 = 1;
}
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;
if (im->input_flow_cache_flag)
{
/* Add an Entry in Flow cache */
ipsec4_input_spd_add_flow_cache_entry (im, sa, da, policy_type, *i);
}
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 *
ipsec6_input_policy_match (ipsec_spd_t *spd, ip6_address_t *sa,
ip6_address_t *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 (!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;
}
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->policies[IPSEC_SPD_POLICY_IP4_INBOUND_PROTECT])
{
p = pool_elt_at_index (im->policies, *i);
s = ipsec_sa_get (p->sa_index);
if (spi != s->spi)
continue;
if (ipsec_sa_is_set_IS_TUNNEL (s))
{
if (da != clib_net_to_host_u32 (s->tunnel.t_dst.ip.ip4.as_u32))
continue;
if (sa != clib_net_to_host_u32 (s->tunnel.t_src.ip.ip4.as_u32))
continue;
goto return_policy;
}
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_policy:
if (im->input_flow_cache_flag)
{
/* Add an Entry in Flow cache */
ipsec4_input_spd_add_flow_cache_entry (
im, sa, da, IPSEC_SPD_POLICY_IP4_INBOUND_PROTECT, *i);
}
return p;
}
return 0;
}
always_inline void
ipsec_collect_ah_trace (vlib_buffer_t **b, vlib_node_runtime_t *node,
vlib_main_t *vm, ip4_header_t *ip0, ah_header_t *ah0,
u8 has_space0, ipsec_spd_t *spd0, ipsec_policy_t *p0,
u32 pi0)
{
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));
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;
}
}
always_inline void
ipsec_ah_packet_process (vlib_main_t *vm, ipsec_main_t *im, ip4_header_t *ip0,
ah_header_t *ah0, u32 thread_index, ipsec_spd_t *spd0,
vlib_buffer_t **b, vlib_node_runtime_t *node,
u64 *ipsec_bypassed, u64 *ipsec_dropped,
u64 *ipsec_matched, u64 *ipsec_unprocessed, u16 *next)
{
ipsec_policy_t *p0 = NULL;
u32 pi0 = ~0;
u8 has_space0;
/* if flow cache is enabled, first search through flow cache for a
* policy match and revert back to linear search on failure */
bool search_flow_cache = im->input_flow_cache_flag;
while (1)
{
if (search_flow_cache)
{
p0 = ipsec4_input_spd_find_flow_cache_entry (
im, ip0->src_address.as_u32, ip0->dst_address.as_u32,
IPSEC_SPD_POLICY_IP4_INBOUND_PROTECT);
}
else
{
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;
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;
ipsec_collect_ah_trace (b, node, vm, ip0, ah0, has_space0, spd0, p0,
pi0);
return;
}
else
{
p0 = 0;
pi0 = ~0;
}
if (search_flow_cache)
{
p0 = ipsec4_input_spd_find_flow_cache_entry (
im, ip0->src_address.as_u32, ip0->dst_address.as_u32,
IPSEC_SPD_POLICY_IP4_INBOUND_BYPASS);
}
else
{
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;
vlib_increment_combined_counter (&ipsec_spd_policy_counters,
thread_index, pi0, 1,
clib_net_to_host_u16 (ip0->length));
ipsec_collect_ah_trace (b, node, vm, ip0, ah0, has_space0, spd0, p0,
pi0);
return;
}
else
{
p0 = 0;
pi0 = ~0;
};
if (search_flow_cache)
{
p0 = ipsec4_input_spd_find_flow_cache_entry (
im, ip0->src_address.as_u32, ip0->dst_address.as_u32,
IPSEC_SPD_POLICY_IP4_INBOUND_DISCARD);
}
else
{
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;
vlib_increment_combined_counter (&ipsec_spd_policy_counters,
thread_index, pi0, 1,
clib_net_to_host_u16 (ip0->length));
next[0] = IPSEC_INPUT_NEXT_DROP;
ipsec_collect_ah_trace (b, node, vm, ip0, ah0, has_space0, spd0, p0,
pi0);
return;
}
else
{
p0 = 0;
pi0 = ~0;
};
/* flow cache search failed, retry with linear search */
if (search_flow_cache && p0 == NULL)
{
search_flow_cache = false;
}
else if (search_flow_cache == false && p0 == NULL)
{
/* Drop by default if no match on PROTECT, BYPASS or DISCARD */
*ipsec_unprocessed += 1;
next[0] = IPSEC_INPUT_NEXT_DROP;
return;
}
}
}
always_inline void
ipsec_esp_packet_process (vlib_main_t *vm, ipsec_main_t *im, ip4_header_t *ip0,
udp_header_t *udp0, esp_header_t *esp0,
u32 thread_index, ipsec_spd_t *spd0,
vlib_buffer_t **b, vlib_node_runtime_t *node,
u64 *ipsec_bypassed, u64 *ipsec_dropped,
u64 *ipsec_matched, u64 *ipsec_unprocessed,
u16 *next)
{
ipsec_policy_t *p0 = NULL;
u32 pi0;
u8 has_space0;
bool search_flow_cache = false;
ipsec_policy_t *policies[1];
ipsec_fp_5tuple_t tuples[1];
bool ip_v6 = true;
/* if flow cache is enabled, first search through flow cache for a
* policy match for either protect, bypass or discard rules, in that
* order. if no match is found search_flow_cache is set to false (0)
* and we revert back to linear search
*/
search_flow_cache = im->input_flow_cache_flag;
udp_or_esp:
/* RFC5996 Section 2.23: "To tunnel IKE packets over UDP port 4500, the IKE
* header has four octets of zero prepended and the result immediately
* follows the UDP header. To tunnel ESP packets over UDP port 4500, the ESP
* header immediately follows the UDP header. Since the first four octets of
* the ESP header contain the SPI, and the SPI cannot validly be zero, it is
* always possible to distinguish ESP and IKE messages."
*/
/* RFC3948 Section 2.1 UDP-Encapsulated ESP Header Format:
* "The UDP header is a standard [RFC0768] header, where
* - the Source Port and Destination Port MUST be the same as that used
* by IKE traffic,
* - the IPv4 UDP Checksum SHOULD be transmitted as a zero value, and
* - receivers MUST NOT depend on the UDP checksum being a zero value.
* The SPI field in the ESP header MUST NOT be a zero value."
*/
/*
* UDP-IKEv2: UDP protocol, checksum != 0, SPI == 0 and port 500/4500
* UDP-ESP: UDP protocol, checksum == 0, SPI != 0 and port 4500
*/
if ((((udp0 != NULL) && (udp0->checksum == 0)) || (udp0 == NULL)) &&
(esp0->spi == 0))
{
/* RFC4303 Section 2.1: "The SPI value of zero (0 is reserved for
* local, implementation-specific use and MUST NOT be sent on the
* wire."
*/
*ipsec_unprocessed += 1;
next[0] = IPSEC_INPUT_NEXT_DROP;
return;
}
if (im->fp_spd_ipv4_in_is_enabled &&
PREDICT_TRUE (INDEX_INVALID != spd0->fp_spd.ip4_in_lookup_hash_idx))
{
ipsec_fp_in_5tuple_from_ip4_range (&tuples[0], ip0->src_address.as_u32,
ip0->dst_address.as_u32,
clib_net_to_host_u32 (esp0->spi),
IPSEC_SPD_POLICY_IP4_INBOUND_PROTECT);
ipsec_fp_in_policy_match_n (&spd0->fp_spd, !ip_v6, tuples, policies, 1);
p0 = policies[0];
}
else if (search_flow_cache) /* attempt to match policy in flow cache */
{
p0 = ipsec4_input_spd_find_flow_cache_entry (
im, ip0->src_address.as_u32, ip0->dst_address.as_u32,
IPSEC_SPD_POLICY_IP4_INBOUND_PROTECT);
}
else /* linear search if flow cache is not enabled,
or flow cache search just failed */
{
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 (b[0], (clib_address_t) (esp0 + 1) -
(clib_address_t) ip0);
if (PREDICT_TRUE ((p0 != NULL) && (has_space0)))
{
*ipsec_matched += 1;
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->esp4_decrypt_next_index;
vlib_buffer_advance (b[0], ((u8 *) esp0 - (u8 *) ip0));
goto trace0;
}
else
{
p0 = 0;
pi0 = ~0;
}
if (im->fp_spd_ipv4_in_is_enabled &&
PREDICT_TRUE (INDEX_INVALID != spd0->fp_spd.ip4_in_lookup_hash_idx))
{
tuples->action = IPSEC_SPD_POLICY_IP4_INBOUND_BYPASS;
ipsec_fp_in_policy_match_n (&spd0->fp_spd, !ip_v6, tuples, policies, 1);
p0 = policies[0];
}
else if (search_flow_cache)
{
p0 = ipsec4_input_spd_find_flow_cache_entry (
im, ip0->src_address.as_u32, ip0->dst_address.as_u32,
IPSEC_SPD_POLICY_IP4_INBOUND_BYPASS);
}
else
{
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;
vlib_increment_combined_counter (&ipsec_spd_policy_counters,
thread_index, pi0, 1,
clib_net_to_host_u16 (ip0->length));
goto trace0;
}
else
{
p0 = 0;
pi0 = ~0;
};
if (im->fp_spd_ipv4_in_is_enabled &&
PREDICT_TRUE (INDEX_INVALID != spd0->fp_spd.ip4_in_lookup_hash_idx))
{
tuples->action = IPSEC_SPD_POLICY_IP4_INBOUND_DISCARD;
ipsec_fp_in_policy_match_n (&spd0->fp_spd, !ip_v6, tuples, policies, 1);
p0 = policies[0];
}
else
if (search_flow_cache)
{
p0 = ipsec4_input_spd_find_flow_cache_entry (
im, ip0->src_address.as_u32, ip0->dst_address.as_u32,
IPSEC_SPD_POLICY_IP4_INBOUND_DISCARD);
}
else
{
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;
vlib_increment_combined_counter (&ipsec_spd_policy_counters,
thread_index, pi0, 1,
clib_net_to_host_u16 (ip0->length));
next[0] = IPSEC_INPUT_NEXT_DROP;
goto trace0;
}
else
{
p0 = 0;
pi0 = ~0;
};
/* flow cache search failed, try again with linear search */
if (search_flow_cache && p0 == NULL)
{
search_flow_cache = false;
goto udp_or_esp;
}
/* Drop by default if no match on PROTECT, BYPASS or DISCARD */
*ipsec_unprocessed += 1;
next[0] = IPSEC_INPUT_NEXT_DROP;
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));
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;
}
}
always_inline ipsec_policy_t *
ipsec6_input_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->policies[IPSEC_SPD_POLICY_IP6_INBOUND_PROTECT])
{
p = pool_elt_at_index (im->policies, *i);
s = ipsec_sa_get (p->sa_index);
if (spi != s->spi)
continue;
if (ipsec_sa_is_set_IS_TUNNEL (s))
{
if (!ip6_address_is_equal (sa, &s->tunnel.t_src.ip.ip6))
continue;
if (!ip6_address_is_equal (da, &s->tunnel.t_dst.ip.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;
}
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 * frame)
{
u32 n_left_from, *from, thread_index;
ipsec_main_t *im = &ipsec_main;
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;
while (n_left_from > 0)
{
u32 next32;
ip4_header_t *ip0;
esp_header_t *esp0 = NULL;
ah_header_t *ah0;
ip4_ipsec_config_t *c0;
ipsec_spd_t *spd0;
if (n_left_from > 2)
{
vlib_prefetch_buffer_data (b[1], LOAD);
}
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;
spd0 = pool_elt_at_index (im->spds, c0->spd_index);
ip0 = vlib_buffer_get_current (b[0]);
if (ip0->protocol == IP_PROTOCOL_UDP)
{
udp_header_t *udp0 = NULL;
udp0 = (udp_header_t *) ((u8 *) ip0 + ip4_header_bytes (ip0));
/* RFC5996 Section 2.23: "Port 4500 is reserved for
* UDP-encapsulated ESP and IKE."
* RFC5996 Section 3.1: "IKE messages use UDP ports 500 and/or 4500"
*/
if ((clib_host_to_net_u16 (500) == udp0->dst_port) ||
(clib_host_to_net_u16 (4500) == udp0->dst_port))
{
esp0 = (esp_header_t *) ((u8 *) udp0 + sizeof (udp_header_t));
ipsec_esp_packet_process (vm, im, ip0, udp0, esp0, thread_index,
spd0, b, node, &ipsec_bypassed,
&ipsec_dropped, &ipsec_matched,
&ipsec_unprocessed, next);
}
}
else if (PREDICT_TRUE (ip0->protocol == IP_PROTOCOL_IPSEC_ESP))
{
esp0 = (esp_header_t *) ((u8 *) ip0 + ip4_header_bytes (ip0));
ipsec_esp_packet_process (vm, im, ip0, NULL, esp0, thread_index,
spd0, b, node, &ipsec_bypassed,
&ipsec_dropped, &ipsec_matched,
&ipsec_unprocessed, next);
}
else if (ip0->protocol == IP_PROTOCOL_IPSEC_AH)
{
ah0 = (ah_header_t *) ((u8 *) ip0 + ip4_header_bytes (ip0));
ipsec_ah_packet_process (vm, im, ip0, ah0, thread_index, spd0, b,
node, &ipsec_bypassed, &ipsec_dropped,
&ipsec_matched, &ipsec_unprocessed, 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, frame->n_vectors);
vlib_node_increment_counter (vm, ipsec4_input_node.index,
IPSEC_INPUT_ERROR_RX_POLICY_MATCH,
ipsec_matched);
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;
}
VLIB_REGISTER_NODE (ipsec4_input_node) = {
.name = "ipsec4-input-feature",
.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 _
},
};
extern vlib_node_registration_t ipsec6_input_node;
always_inline void
ipsec6_esp_packet_process (vlib_main_t *vm, ipsec_main_t *im,
ip6_header_t *ip0, esp_header_t *esp0,
u32 thread_index, ipsec_spd_t *spd0,
vlib_buffer_t **b, vlib_node_runtime_t *node,
u64 *ipsec_bypassed, u64 *ipsec_dropped,
u64 *ipsec_matched, u64 *ipsec_unprocessed,
u32 *next)
{
ipsec_policy_t *p0 = NULL;
u32 pi0 = ~0;
u8 has_space0 = 0;
ipsec_policy_t *policies[1];
ipsec_fp_5tuple_t tuples[1];
bool ip_v6 = true;
if (im->fp_spd_ipv6_in_is_enabled &&
PREDICT_TRUE (INDEX_INVALID != spd0->fp_spd.ip6_in_lookup_hash_idx))
ipsec_fp_in_5tuple_from_ip6_range (
&tuples[0], &ip0->src_address, &ip0->dst_address,
clib_net_to_host_u32 (esp0->spi), IPSEC_SPD_POLICY_IP6_INBOUND_PROTECT);
if (esp0->spi != 0)
{
if (im->fp_spd_ipv6_in_is_enabled &&
PREDICT_TRUE (INDEX_INVALID != spd0->fp_spd.ip6_in_lookup_hash_idx))
{
ipsec_fp_in_policy_match_n (&spd0->fp_spd, ip_v6, tuples, policies,
1);
p0 = policies[0];
}
else /* linear search if fast path is not enabled */
{
p0 = ipsec6_input_protect_policy_match (
spd0, &ip0->src_address, &ip0->dst_address,
clib_net_to_host_u32 (esp0->spi));
}
has_space0 = vlib_buffer_has_space (b[0], (clib_address_t) (esp0 + 1) -
(clib_address_t) ip0);
if (PREDICT_TRUE ((p0 != NULL) && (has_space0)))
{
*ipsec_matched += 1;
pi0 = p0 - im->policies;
vlib_increment_combined_counter (
&ipsec_spd_policy_counters, thread_index, pi0, 1,
clib_net_to_host_u16 (ip0->payload_length));
vnet_buffer (b[0])->ipsec.sad_index = p0->sa_index;
next[0] = im->esp6_decrypt_next_index;
vlib_buffer_advance (b[0], ((u8 *) esp0 - (u8 *) ip0));
goto trace0;
}
}
if (im->fp_spd_ipv6_in_is_enabled &&
PREDICT_TRUE (INDEX_INVALID != spd0->fp_spd.ip6_in_lookup_hash_idx))
{
tuples->action = IPSEC_SPD_POLICY_IP6_INBOUND_BYPASS;
ipsec_fp_in_policy_match_n (&spd0->fp_spd, ip_v6, tuples, policies, 1);
p0 = policies[0];
}
else
{
p0 =
ipsec6_input_policy_match (spd0, &ip0->src_address, &ip0->dst_address,
IPSEC_SPD_POLICY_IP6_INBOUND_BYPASS);
}
if (PREDICT_TRUE ((p0 != NULL)))
{
*ipsec_bypassed += 1;
pi0 = p0 - im->policies;
vlib_increment_combined_counter (
&ipsec_spd_policy_counters, thread_index, pi0, 1,
clib_net_to_host_u16 (ip0->payload_length));
goto trace0;
}
else
{
p0 = NULL;
pi0 = ~0;
}
if (im->fp_spd_ipv6_in_is_enabled &&
PREDICT_TRUE (INDEX_INVALID != spd0->fp_spd.ip6_in_lookup_hash_idx))
{
tuples->action = IPSEC_SPD_POLICY_IP6_INBOUND_DISCARD;
ipsec_fp_in_policy_match_n (&spd0->fp_spd, ip_v6, tuples, policies, 1);
p0 = policies[0];
}
else
{
p0 =
ipsec6_input_policy_match (spd0, &ip0->src_address, &ip0->dst_address,
IPSEC_SPD_POLICY_IP6_INBOUND_DISCARD);
}
if (PREDICT_TRUE ((p0 != NULL)))
{
*ipsec_dropped += 1;
pi0 = p0 - im->policies;
vlib_increment_combined_counter (
&ipsec_spd_policy_counters, thread_index, pi0, 1,
clib_net_to_host_u16 (ip0->payload_length));
next[0] = IPSEC_INPUT_NEXT_DROP;
goto trace0;
}
else
{
p0 = 0;
pi0 = ~0;
}
/* Drop by default if no match on PROTECT, BYPASS or DISCARD */
*ipsec_unprocessed += 1;
next[0] = IPSEC_INPUT_NEXT_DROP;
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));
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;
}
}
VLIB_NODE_FN (ipsec6_input_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * from_frame)
{
u32 n_left_from, *from, next_index, *to_next, 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;
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 bi0, next0, pi0 = ~0;
vlib_buffer_t *b0;
ip6_header_t *ip0;
esp_header_t *esp0 = NULL;
ip4_ipsec_config_t *c0;
ipsec_spd_t *spd0;
ipsec_policy_t *p0 = 0;
u32 header_size = sizeof (ip0[0]);
u64 ipsec_unprocessed = 0, ipsec_matched = 0;
u64 ipsec_dropped = 0, ipsec_bypassed = 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);
b0->flags |= VNET_BUFFER_F_IS_IP6;
b0->flags &= ~VNET_BUFFER_F_IS_IP4;
c0 = vnet_feature_next_with_data (&next0, b0, sizeof (c0[0]));
spd0 = pool_elt_at_index (im->spds, c0->spd_index);
ip0 = vlib_buffer_get_current (b0);
if (ip0->protocol == IP_PROTOCOL_UDP)
{
udp_header_t *udp0 = (udp_header_t *) ((u8 *) ip0 + header_size);
/* RFC5996 Section 2.23: "Port 4500 is reserved for
* UDP-encapsulated ESP and IKE."
* RFC5996 Section 3.1: "IKE messages use UDP ports 500 and/or
4500"
*/
if ((clib_host_to_net_u16 (500) == udp0->dst_port) ||
(clib_host_to_net_u16 (4500) == udp0->dst_port))
esp0 = (esp_header_t *) ((u8 *) udp0 + sizeof (udp_header_t));
}
else if (ip0->protocol == IP_PROTOCOL_IPSEC_ESP)
esp0 = (esp_header_t *) ((u8 *) ip0 + header_size);
if (esp0 != NULL)
{
ipsec6_esp_packet_process (vm, im, ip0, esp0, thread_index, spd0,
&b0, node, &ipsec_bypassed,
&ipsec_dropped, &ipsec_matched,
&ipsec_unprocessed, &next0);
}
else if (ip0->protocol == IP_PROTOCOL_IPSEC_AH)
{
ah_header_t *ah0 = (ah_header_t *) ((u8 *) ip0 + header_size);
p0 = ipsec6_input_protect_policy_match (
spd0, &ip0->src_address, &ip0->dst_address,
clib_net_to_host_u32 (ah0->spi));
if (PREDICT_TRUE (p0 != 0))
{
ipsec_matched += 1;
pi0 = p0 - im->policies;
vlib_increment_combined_counter (
&ipsec_spd_policy_counters, thread_index, pi0, 1,
clib_net_to_host_u16 (ip0->payload_length) + header_size);
vnet_buffer (b0)->ipsec.sad_index = p0->sa_index;
next0 = im->ah6_decrypt_next_index;
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));
if (p0)
{
tr->sa_id = p0->sa_id;
tr->policy_type = p0->type;
}
tr->proto = ip0->protocol;
tr->spi = clib_net_to_host_u32 (ah0->spi);
tr->spd = spd0->id;
tr->policy_index = pi0;
}
}
else
{
pi0 = ~0;
ipsec_unprocessed += 1;
next0 = IPSEC_INPUT_NEXT_DROP;
}
}
else
{
ipsec_unprocessed += 1;
}
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, ipsec6_input_node.index,
IPSEC_INPUT_ERROR_RX_PKTS,
from_frame->n_vectors - ipsec_unprocessed);
vlib_node_increment_counter (vm, ipsec6_input_node.index,
IPSEC_INPUT_ERROR_RX_POLICY_MATCH,
ipsec_matched);
return from_frame->n_vectors;
}
VLIB_REGISTER_NODE (ipsec6_input_node) = {
.name = "ipsec6-input-feature",
.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 _
},
};
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/