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gerrit.nordix.org / fdio / vpp / 01a2a10715551ccbad760cec641786aa079c373a / . / src / vnet / ip / reass / ip6_sv_reass.c
blob: 7c13f4b7face1d44fbbcb69f99b09778ff4f931a [file] [log] [blame]
/*
* Copyright (c) 2017 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.
*/
/**
* @file
* @brief IPv6 Shallow Virtual Reassembly.
*
* This file contains the source code for IPv6 Shallow Virtual reassembly.
*/
#include <vppinfra/vec.h>
#include <vnet/vnet.h>
#include <vnet/ip/ip.h>
#include <vnet/ip/ip6_to_ip4.h>
#include <vppinfra/bihash_48_8.h>
#include <vnet/ip/reass/ip6_sv_reass.h>
#define MSEC_PER_SEC 1000
#define IP6_SV_REASS_TIMEOUT_DEFAULT_MS 100
#define IP6_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000 // 10 seconds default
#define IP6_SV_REASS_MAX_REASSEMBLIES_DEFAULT 1024
#define IP6_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3
#define IP6_SV_REASS_HT_LOAD_FACTOR (0.75)
typedef enum
{
IP6_SV_REASS_RC_OK,
IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS,
IP6_SV_REASS_RC_INTERNAL_ERROR,
IP6_SV_REASS_RC_UNSUPP_IP_PROTO,
} ip6_sv_reass_rc_t;
typedef struct
{
union
{
struct
{
ip6_address_t src;
ip6_address_t dst;
u32 xx_id;
u32 frag_id;
u8 unused[7];
u8 proto;
};
u64 as_u64[6];
};
} ip6_sv_reass_key_t;
typedef union
{
struct
{
u32 reass_index;
u32 thread_index;
};
u64 as_u64;
} ip6_sv_reass_val_t;
typedef union
{
struct
{
ip6_sv_reass_key_t k;
ip6_sv_reass_val_t v;
};
clib_bihash_kv_48_8_t kv;
} ip6_sv_reass_kv_t;
typedef struct
{
// hash table key
ip6_sv_reass_key_t key;
// time when last packet was received
f64 last_heard;
// internal id of this reassembly
u64 id;
// trace operation counter
u32 trace_op_counter;
// buffer indexes of buffers in this reassembly in chronological order -
// including overlaps and duplicate fragments
u32 *cached_buffers;
// set to true when this reassembly is completed
bool is_complete;
// ip protocol
u8 ip_proto;
u8 icmp_type_or_tcp_flags;
u32 tcp_ack_number;
u32 tcp_seq_number;
// l4 src port
u16 l4_src_port;
// l4 dst port
u16 l4_dst_port;
// lru indexes
u32 lru_prev;
u32 lru_next;
} ip6_sv_reass_t;
typedef struct
{
ip6_sv_reass_t *pool;
u32 reass_n;
u32 id_counter;
clib_spinlock_t lock;
// lru indexes
u32 lru_first;
u32 lru_last;
} ip6_sv_reass_per_thread_t;
typedef struct
{
// IPv6 config
u32 timeout_ms;
f64 timeout;
u32 expire_walk_interval_ms;
// maximum number of fragments in one reassembly
u32 max_reass_len;
// maximum number of reassemblies
u32 max_reass_n;
// IPv6 runtime
clib_bihash_48_8_t hash;
// per-thread data
ip6_sv_reass_per_thread_t *per_thread_data;
// convenience
vlib_main_t *vlib_main;
vnet_main_t *vnet_main;
// node index of ip6-drop node
u32 ip6_drop_idx;
u32 ip6_icmp_error_idx;
u32 ip6_sv_reass_expire_node_idx;
/** Worker handoff */
u32 fq_index;
u32 fq_feature_index;
// reference count for enabling/disabling feature - per interface
u32 *feature_use_refcount_per_intf;
} ip6_sv_reass_main_t;
extern ip6_sv_reass_main_t ip6_sv_reass_main;
#ifndef CLIB_MARCH_VARIANT
ip6_sv_reass_main_t ip6_sv_reass_main;
#endif /* CLIB_MARCH_VARIANT */
typedef enum
{
IP6_SV_REASSEMBLY_NEXT_INPUT,
IP6_SV_REASSEMBLY_NEXT_DROP,
IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR,
IP6_SV_REASSEMBLY_NEXT_HANDOFF,
IP6_SV_REASSEMBLY_N_NEXT,
} ip6_sv_reass_next_t;
typedef enum
{
REASS_FRAGMENT_CACHE,
REASS_FINISH,
REASS_FRAGMENT_FORWARD,
REASS_PASSTHROUGH,
} ip6_sv_reass_trace_operation_e;
typedef struct
{
ip6_sv_reass_trace_operation_e action;
u32 reass_id;
u32 op_id;
u8 ip_proto;
u16 l4_src_port;
u16 l4_dst_port;
} ip6_sv_reass_trace_t;
static u8 *
format_ip6_sv_reass_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 *);
ip6_sv_reass_trace_t *t = va_arg (*args, ip6_sv_reass_trace_t *);
if (REASS_PASSTHROUGH != t->action)
{
s = format (s, "reass id: %u, op id: %u ", t->reass_id, t->op_id);
}
switch (t->action)
{
case REASS_FRAGMENT_CACHE:
s = format (s, "[cached]");
break;
case REASS_FINISH:
s =
format (s, "[finish, ip proto=%u, src_port=%u, dst_port=%u]",
t->ip_proto, clib_net_to_host_u16 (t->l4_src_port),
clib_net_to_host_u16 (t->l4_dst_port));
break;
case REASS_FRAGMENT_FORWARD:
s =
format (s, "[forward, ip proto=%u, src_port=%u, dst_port=%u]",
t->ip_proto, clib_net_to_host_u16 (t->l4_src_port),
clib_net_to_host_u16 (t->l4_dst_port));
break;
case REASS_PASSTHROUGH:
s = format (s, "[not-fragmented]");
break;
}
return s;
}
static void
ip6_sv_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
ip6_sv_reass_main_t * rm,
ip6_sv_reass_t * reass, u32 bi,
ip6_sv_reass_trace_operation_e action,
u32 ip_proto, u16 l4_src_port, u16 l4_dst_port)
{
vlib_buffer_t *b = vlib_get_buffer (vm, bi);
ip6_sv_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
if (reass)
{
t->reass_id = reass->id;
t->op_id = reass->trace_op_counter;
++reass->trace_op_counter;
}
t->action = action;
t->ip_proto = ip_proto;
t->l4_src_port = l4_src_port;
t->l4_dst_port = l4_dst_port;
#if 0
static u8 *s = NULL;
s = format (s, "%U", format_ip6_sv_reass_trace, NULL, NULL, t);
printf ("%.*s\n", vec_len (s), s);
fflush (stdout);
vec_reset_length (s);
#endif
}
always_inline void
ip6_sv_reass_free (vlib_main_t * vm, ip6_sv_reass_main_t * rm,
ip6_sv_reass_per_thread_t * rt, ip6_sv_reass_t * reass)
{
clib_bihash_kv_48_8_t kv;
kv.key[0] = reass->key.as_u64[0];
kv.key[1] = reass->key.as_u64[1];
kv.key[2] = reass->key.as_u64[2];
kv.key[3] = reass->key.as_u64[3];
kv.key[4] = reass->key.as_u64[4];
kv.key[5] = reass->key.as_u64[5];
clib_bihash_add_del_48_8 (&rm->hash, &kv, 0);
vlib_buffer_free (vm, reass->cached_buffers,
vec_len (reass->cached_buffers));
vec_free (reass->cached_buffers);
reass->cached_buffers = NULL;
if (~0 != reass->lru_prev)
{
ip6_sv_reass_t *lru_prev =
pool_elt_at_index (rt->pool, reass->lru_prev);
lru_prev->lru_next = reass->lru_next;
}
if (~0 != reass->lru_next)
{
ip6_sv_reass_t *lru_next =
pool_elt_at_index (rt->pool, reass->lru_next);
lru_next->lru_prev = reass->lru_prev;
}
if (rt->lru_first == reass - rt->pool)
{
rt->lru_first = reass->lru_next;
}
if (rt->lru_last == reass - rt->pool)
{
rt->lru_last = reass->lru_prev;
}
pool_put (rt->pool, reass);
--rt->reass_n;
}
always_inline void
ip6_sv_reass_init (ip6_sv_reass_t * reass)
{
reass->cached_buffers = NULL;
reass->is_complete = false;
}
always_inline ip6_sv_reass_t *
ip6_sv_reass_find_or_create (vlib_main_t * vm, vlib_node_runtime_t * node,
ip6_sv_reass_main_t * rm,
ip6_sv_reass_per_thread_t * rt,
ip6_sv_reass_kv_t * kv, u32 * icmp_bi,
u8 * do_handoff)
{
ip6_sv_reass_t *reass = NULL;
f64 now = vlib_time_now (vm);
if (!clib_bihash_search_48_8 (&rm->hash, &kv->kv, &kv->kv))
{
if (vm->thread_index != kv->v.thread_index)
{
*do_handoff = 1;
return NULL;
}
reass = pool_elt_at_index (rt->pool, kv->v.reass_index);
if (now > reass->last_heard + rm->timeout)
{
ip6_sv_reass_free (vm, rm, rt, reass);
reass = NULL;
}
}
if (reass)
{
reass->last_heard = now;
return reass;
}
if (rt->reass_n >= rm->max_reass_n)
{
reass = pool_elt_at_index (rt->pool, rt->lru_first);
ip6_sv_reass_free (vm, rm, rt, reass);
}
pool_get (rt->pool, reass);
clib_memset (reass, 0, sizeof (*reass));
reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
++rt->id_counter;
ip6_sv_reass_init (reass);
++rt->reass_n;
reass->lru_prev = reass->lru_next = ~0;
if (~0 != rt->lru_last)
{
ip6_sv_reass_t *lru_last = pool_elt_at_index (rt->pool, rt->lru_last);
reass->lru_prev = rt->lru_last;
lru_last->lru_next = rt->lru_last = reass - rt->pool;
}
if (~0 == rt->lru_first)
{
rt->lru_first = rt->lru_last = reass - rt->pool;
}
reass->key.as_u64[0] = kv->kv.key[0];
reass->key.as_u64[1] = kv->kv.key[1];
reass->key.as_u64[2] = kv->kv.key[2];
reass->key.as_u64[3] = kv->kv.key[3];
reass->key.as_u64[4] = kv->kv.key[4];
reass->key.as_u64[5] = kv->kv.key[5];
kv->v.reass_index = (reass - rt->pool);
kv->v.thread_index = vm->thread_index;
reass->last_heard = now;
if (clib_bihash_add_del_48_8 (&rm->hash, &kv->kv, 1))
{
ip6_sv_reass_free (vm, rm, rt, reass);
reass = NULL;
}
return reass;
}
always_inline ip6_sv_reass_rc_t
ip6_sv_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
ip6_sv_reass_main_t * rm, ip6_sv_reass_per_thread_t * rt,
ip6_sv_reass_t * reass, u32 bi0,
ip6_frag_hdr_t * frag_hdr)
{
vlib_buffer_t *fb = vlib_get_buffer (vm, bi0);
vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
fvnb->ip.reass.ip6_frag_hdr_offset =
(u8 *) frag_hdr - (u8 *) vlib_buffer_get_current (fb);
ip6_header_t *fip = vlib_buffer_get_current (fb);
if (fb->current_length < sizeof (*fip) ||
fvnb->ip.reass.ip6_frag_hdr_offset == 0 ||
fvnb->ip.reass.ip6_frag_hdr_offset >= fb->current_length)
{
return IP6_SV_REASS_RC_INTERNAL_ERROR;
}
u32 fragment_first = fvnb->ip.reass.fragment_first =
ip6_frag_hdr_offset_bytes (frag_hdr);
u32 fragment_length =
vlib_buffer_length_in_chain (vm, fb) -
(fvnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
u32 fragment_last = fvnb->ip.reass.fragment_last =
fragment_first + fragment_length - 1;
fvnb->ip.reass.range_first = fragment_first;
fvnb->ip.reass.range_last = fragment_last;
fvnb->ip.reass.next_range_bi = ~0;
if (0 == fragment_first)
{
if (!ip6_get_port
(vm, fb, fip, fb->current_length, &reass->ip_proto,
&reass->l4_src_port, &reass->l4_dst_port,
&reass->icmp_type_or_tcp_flags, &reass->tcp_ack_number,
&reass->tcp_seq_number))
return IP6_SV_REASS_RC_UNSUPP_IP_PROTO;
reass->is_complete = true;
vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
{
ip6_sv_reass_add_trace (vm, node, rm, reass, bi0, REASS_FINISH,
reass->ip_proto, reass->l4_src_port,
reass->l4_dst_port);
}
}
vec_add1 (reass->cached_buffers, bi0);
if (!reass->is_complete)
{
if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
{
ip6_sv_reass_add_trace (vm, node, rm, reass, bi0,
REASS_FRAGMENT_CACHE, reass->ip_proto,
reass->l4_src_port, reass->l4_dst_port);
}
if (vec_len (reass->cached_buffers) > rm->max_reass_len)
{
return IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS;
}
}
return IP6_SV_REASS_RC_OK;
}
always_inline bool
ip6_sv_reass_verify_upper_layer_present (vlib_node_runtime_t * node,
vlib_buffer_t * b,
ip6_frag_hdr_t * frag_hdr)
{
ip6_ext_header_t *tmp = (ip6_ext_header_t *) frag_hdr;
while (ip6_ext_hdr (tmp->next_hdr))
{
tmp = ip6_ext_next_header (tmp);
}
if (IP_PROTOCOL_IP6_NONXT == tmp->next_hdr)
{
icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
ICMP6_parameter_problem_first_fragment_has_incomplete_header_chain,
0);
b->error = node->errors[IP6_ERROR_REASS_MISSING_UPPER];
return false;
}
return true;
}
always_inline bool
ip6_sv_reass_verify_fragment_multiple_8 (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_buffer_t * b,
ip6_frag_hdr_t * frag_hdr)
{
vnet_buffer_opaque_t *vnb = vnet_buffer (b);
ip6_header_t *ip = vlib_buffer_get_current (b);
int more_fragments = ip6_frag_hdr_more (frag_hdr);
u32 fragment_length =
vlib_buffer_length_in_chain (vm, b) -
(vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
if (more_fragments && 0 != fragment_length % 8)
{
icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
ICMP6_parameter_problem_erroneous_header_field,
(u8 *) & ip->payload_length - (u8 *) ip);
return false;
}
return true;
}
always_inline bool
ip6_sv_reass_verify_packet_size_lt_64k (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_buffer_t * b,
ip6_frag_hdr_t * frag_hdr)
{
vnet_buffer_opaque_t *vnb = vnet_buffer (b);
u32 fragment_first = ip6_frag_hdr_offset_bytes (frag_hdr);
u32 fragment_length =
vlib_buffer_length_in_chain (vm, b) -
(vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
if (fragment_first + fragment_length > 65535)
{
ip6_header_t *ip0 = vlib_buffer_get_current (b);
icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
ICMP6_parameter_problem_erroneous_header_field,
(u8 *) & frag_hdr->fragment_offset_and_more
- (u8 *) ip0);
return false;
}
return true;
}
always_inline uword
ip6_sv_reassembly_inline (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame, bool is_feature)
{
u32 *from = vlib_frame_vector_args (frame);
u32 n_left_from, n_left_to_next, *to_next, next_index;
ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
clib_spinlock_lock (&rt->lock);
n_left_from = frame->n_vectors;
next_index = node->cached_next_index;
while (n_left_from > 0)
{
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;
vlib_buffer_t *b0;
u32 next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
u32 error0 = IP6_ERROR_NONE;
u32 icmp_bi = ~0;
bi0 = from[0];
b0 = vlib_get_buffer (vm, bi0);
ip6_header_t *ip0 = vlib_buffer_get_current (b0);
ip6_frag_hdr_t *frag_hdr = NULL;
ip6_ext_header_t *prev_hdr;
if (ip6_ext_hdr (ip0->protocol))
{
frag_hdr =
ip6_ext_header_find (vm, b0, ip0,
IP_PROTOCOL_IPV6_FRAGMENTATION,
&prev_hdr);
}
if (!frag_hdr)
{
// this is a regular packet - no fragmentation
if (!ip6_get_port
(vm, b0, ip0, b0->current_length,
&(vnet_buffer (b0)->ip.reass.ip_proto),
&(vnet_buffer (b0)->ip.reass.l4_src_port),
&(vnet_buffer (b0)->ip.reass.l4_dst_port),
&(vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags),
&(vnet_buffer (b0)->ip.reass.tcp_ack_number),
&(vnet_buffer (b0)->ip.reass.tcp_seq_number)))
{
error0 = IP6_ERROR_REASS_UNSUPP_IP_PROTO;
b0->error = node->errors[error0];
next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
goto packet_enqueue;
}
vnet_buffer (b0)->ip.reass.is_non_first_fragment = 0;
next0 = IP6_SV_REASSEMBLY_NEXT_INPUT;
if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
{
ip6_sv_reass_add_trace (vm, node, rm, NULL, bi0,
REASS_PASSTHROUGH,
vnet_buffer (b0)->ip.reass.ip_proto,
vnet_buffer (b0)->ip.
reass.l4_src_port,
vnet_buffer (b0)->ip.
reass.l4_dst_port);
}
goto packet_enqueue;
}
vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
(u8 *) frag_hdr - (u8 *) ip0;
if (0 == ip6_frag_hdr_offset (frag_hdr))
{
// first fragment - verify upper-layer is present
if (!ip6_sv_reass_verify_upper_layer_present
(node, b0, frag_hdr))
{
next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
goto packet_enqueue;
}
}
if (!ip6_sv_reass_verify_fragment_multiple_8
(vm, node, b0, frag_hdr)
|| !ip6_sv_reass_verify_packet_size_lt_64k (vm, node, b0,
frag_hdr))
{
next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
goto packet_enqueue;
}
ip6_sv_reass_kv_t kv;
u8 do_handoff = 0;
kv.k.as_u64[0] = ip0->src_address.as_u64[0];
kv.k.as_u64[1] = ip0->src_address.as_u64[1];
kv.k.as_u64[2] = ip0->dst_address.as_u64[0];
kv.k.as_u64[3] = ip0->dst_address.as_u64[1];
kv.k.as_u64[4] =
((u64) vec_elt (ip6_main.fib_index_by_sw_if_index,
vnet_buffer (b0)->sw_if_index[VLIB_RX])) << 32 |
(u64) frag_hdr->identification;
kv.k.as_u64[5] = ip0->protocol;
ip6_sv_reass_t *reass =
ip6_sv_reass_find_or_create (vm, node, rm, rt, &kv, &icmp_bi,
&do_handoff);
if (PREDICT_FALSE (do_handoff))
{
next0 = IP6_SV_REASSEMBLY_NEXT_HANDOFF;
vnet_buffer (b0)->ip.reass.owner_thread_index =
kv.v.thread_index;
goto packet_enqueue;
}
if (!reass)
{
next0 = IP6_SV_REASSEMBLY_NEXT_DROP;
error0 = IP6_ERROR_REASS_LIMIT_REACHED;
b0->error = node->errors[error0];
goto packet_enqueue;
}
if (reass->is_complete)
{
vnet_buffer (b0)->ip.reass.is_non_first_fragment =
! !ip6_frag_hdr_offset (frag_hdr);
vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
reass->icmp_type_or_tcp_flags;
vnet_buffer (b0)->ip.reass.tcp_ack_number =
reass->tcp_ack_number;
vnet_buffer (b0)->ip.reass.tcp_seq_number =
reass->tcp_seq_number;
vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
next0 = IP6_SV_REASSEMBLY_NEXT_INPUT;
if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
{
ip6_sv_reass_add_trace (vm, node, rm, reass, bi0,
REASS_FRAGMENT_FORWARD,
reass->ip_proto,
reass->l4_src_port,
reass->l4_dst_port);
}
goto packet_enqueue;
}
switch (ip6_sv_reass_update
(vm, node, rm, rt, reass, bi0, frag_hdr))
{
case IP6_SV_REASS_RC_OK:
/* nothing to do here */
break;
case IP6_SV_REASS_RC_TOO_MANY_FRAGMENTS:
vlib_node_increment_counter (vm, node->node_index,
IP6_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
1);
ip6_sv_reass_free (vm, rm, rt, reass);
goto next_packet;
break;
case IP6_SV_REASS_RC_UNSUPP_IP_PROTO:
vlib_node_increment_counter (vm, node->node_index,
IP6_ERROR_REASS_UNSUPP_IP_PROTO,
1);
ip6_sv_reass_free (vm, rm, rt, reass);
goto next_packet;
break;
case IP6_SV_REASS_RC_INTERNAL_ERROR:
vlib_node_increment_counter (vm, node->node_index,
IP6_ERROR_REASS_INTERNAL_ERROR, 1);
ip6_sv_reass_free (vm, rm, rt, reass);
goto next_packet;
break;
}
if (reass->is_complete)
{
u32 idx;
vec_foreach_index (idx, reass->cached_buffers)
{
u32 bi0 = vec_elt (reass->cached_buffers, idx);
if (0 == n_left_to_next)
{
vlib_put_next_frame (vm, node, next_index,
n_left_to_next);
vlib_get_next_frame (vm, node, next_index, to_next,
n_left_to_next);
}
to_next[0] = bi0;
to_next += 1;
n_left_to_next -= 1;
b0 = vlib_get_buffer (vm, bi0);
if (is_feature)
{
vnet_feature_next (&next0, b0);
}
frag_hdr =
vlib_buffer_get_current (b0) +
vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset;
vnet_buffer (b0)->ip.reass.is_non_first_fragment =
! !ip6_frag_hdr_offset (frag_hdr);
vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags =
reass->icmp_type_or_tcp_flags;
vnet_buffer (b0)->ip.reass.tcp_ack_number =
reass->tcp_ack_number;
vnet_buffer (b0)->ip.reass.tcp_seq_number =
reass->tcp_seq_number;
vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
{
ip6_sv_reass_add_trace (vm, node, rm, reass, bi0,
REASS_FRAGMENT_FORWARD,
reass->ip_proto,
reass->l4_src_port,
reass->l4_dst_port);
}
vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
to_next, n_left_to_next, bi0,
next0);
}
_vec_len (reass->cached_buffers) = 0; // buffers are owned by frame now
}
goto next_packet;
packet_enqueue:
to_next[0] = bi0;
to_next += 1;
n_left_to_next -= 1;
if (is_feature && IP6_ERROR_NONE == error0)
{
b0 = vlib_get_buffer (vm, bi0);
vnet_feature_next (&next0, b0);
}
vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
n_left_to_next, bi0, next0);
if (~0 != icmp_bi)
{
next0 = IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR;
to_next[0] = icmp_bi;
to_next += 1;
n_left_to_next -= 1;
vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
n_left_to_next, icmp_bi,
next0);
}
next_packet:
from += 1;
n_left_from -= 1;
}
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
}
clib_spinlock_unlock (&rt->lock);
return frame->n_vectors;
}
static char *ip6_sv_reassembly_error_strings[] = {
#define _(sym, string) string,
foreach_ip6_error
#undef _
};
VLIB_NODE_FN (ip6_sv_reass_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
return ip6_sv_reassembly_inline (vm, node, frame, false /* is_feature */ );
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip6_sv_reass_node) = {
.name = "ip6-sv-reassembly",
.vector_size = sizeof (u32),
.format_trace = format_ip6_sv_reass_trace,
.n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
.error_strings = ip6_sv_reassembly_error_strings,
.n_next_nodes = IP6_SV_REASSEMBLY_N_NEXT,
.next_nodes =
{
[IP6_SV_REASSEMBLY_NEXT_INPUT] = "ip6-input",
[IP6_SV_REASSEMBLY_NEXT_DROP] = "ip6-drop",
[IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
[IP6_SV_REASSEMBLY_NEXT_HANDOFF] = "ip6-sv-reassembly-handoff",
},
};
/* *INDENT-ON* */
VLIB_NODE_FN (ip6_sv_reass_node_feature) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
return ip6_sv_reassembly_inline (vm, node, frame, true /* is_feature */ );
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip6_sv_reass_node_feature) = {
.name = "ip6-sv-reassembly-feature",
.vector_size = sizeof (u32),
.format_trace = format_ip6_sv_reass_trace,
.n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
.error_strings = ip6_sv_reassembly_error_strings,
.n_next_nodes = IP6_SV_REASSEMBLY_N_NEXT,
.next_nodes =
{
[IP6_SV_REASSEMBLY_NEXT_INPUT] = "ip6-input",
[IP6_SV_REASSEMBLY_NEXT_DROP] = "ip6-drop",
[IP6_SV_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
[IP6_SV_REASSEMBLY_NEXT_HANDOFF] = "ip6-sv-reass-feature-hoff",
},
};
/* *INDENT-ON* */
/* *INDENT-OFF* */
VNET_FEATURE_INIT (ip6_sv_reassembly_feature) = {
.arc_name = "ip6-unicast",
.node_name = "ip6-sv-reassembly-feature",
.runs_before = VNET_FEATURES ("ip6-lookup"),
.runs_after = 0,
};
/* *INDENT-ON* */
#ifndef CLIB_MARCH_VARIANT
static u32
ip6_sv_reass_get_nbuckets ()
{
ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
u32 nbuckets;
u8 i;
nbuckets = (u32) (rm->max_reass_n / IP6_SV_REASS_HT_LOAD_FACTOR);
for (i = 0; i < 31; i++)
if ((1 << i) >= nbuckets)
break;
nbuckets = 1 << i;
return nbuckets;
}
#endif /* CLIB_MARCH_VARIANT */
typedef enum
{
IP6_EVENT_CONFIG_CHANGED = 1,
} ip6_sv_reass_event_t;
#ifndef CLIB_MARCH_VARIANT
typedef struct
{
int failure;
clib_bihash_48_8_t *new_hash;
} ip6_rehash_cb_ctx;
static int
ip6_rehash_cb (clib_bihash_kv_48_8_t * kv, void *_ctx)
{
ip6_rehash_cb_ctx *ctx = _ctx;
if (clib_bihash_add_del_48_8 (ctx->new_hash, kv, 1))
{
ctx->failure = 1;
}
return (BIHASH_WALK_CONTINUE);
}
static void
ip6_sv_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
u32 max_reassembly_length,
u32 expire_walk_interval_ms)
{
ip6_sv_reass_main.timeout_ms = timeout_ms;
ip6_sv_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
ip6_sv_reass_main.max_reass_n = max_reassemblies;
ip6_sv_reass_main.max_reass_len = max_reassembly_length;
ip6_sv_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
}
vnet_api_error_t
ip6_sv_reass_set (u32 timeout_ms, u32 max_reassemblies,
u32 max_reassembly_length, u32 expire_walk_interval_ms)
{
u32 old_nbuckets = ip6_sv_reass_get_nbuckets ();
ip6_sv_reass_set_params (timeout_ms, max_reassemblies,
max_reassembly_length, expire_walk_interval_ms);
vlib_process_signal_event (ip6_sv_reass_main.vlib_main,
ip6_sv_reass_main.ip6_sv_reass_expire_node_idx,
IP6_EVENT_CONFIG_CHANGED, 0);
u32 new_nbuckets = ip6_sv_reass_get_nbuckets ();
if (ip6_sv_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
{
clib_bihash_48_8_t new_hash;
clib_memset (&new_hash, 0, sizeof (new_hash));
ip6_rehash_cb_ctx ctx;
ctx.failure = 0;
ctx.new_hash = &new_hash;
clib_bihash_init_48_8 (&new_hash, "ip6-sv-reass", new_nbuckets,
new_nbuckets * 1024);
clib_bihash_foreach_key_value_pair_48_8 (&ip6_sv_reass_main.hash,
ip6_rehash_cb, &ctx);
if (ctx.failure)
{
clib_bihash_free_48_8 (&new_hash);
return -1;
}
else
{
clib_bihash_free_48_8 (&ip6_sv_reass_main.hash);
clib_memcpy_fast (&ip6_sv_reass_main.hash, &new_hash,
sizeof (ip6_sv_reass_main.hash));
clib_bihash_copied (&ip6_sv_reass_main.hash, &new_hash);
}
}
return 0;
}
vnet_api_error_t
ip6_sv_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
u32 * max_reassembly_length, u32 * expire_walk_interval_ms)
{
*timeout_ms = ip6_sv_reass_main.timeout_ms;
*max_reassemblies = ip6_sv_reass_main.max_reass_n;
*max_reassembly_length = ip6_sv_reass_main.max_reass_len;
*expire_walk_interval_ms = ip6_sv_reass_main.expire_walk_interval_ms;
return 0;
}
static clib_error_t *
ip6_sv_reass_init_function (vlib_main_t * vm)
{
ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
clib_error_t *error = 0;
u32 nbuckets;
vlib_node_t *node;
rm->vlib_main = vm;
rm->vnet_main = vnet_get_main ();
vec_validate (rm->per_thread_data, vlib_num_workers ());
ip6_sv_reass_per_thread_t *rt;
vec_foreach (rt, rm->per_thread_data)
{
clib_spinlock_init (&rt->lock);
pool_alloc (rt->pool, rm->max_reass_n);
rt->lru_first = rt->lru_last = ~0;
}
node = vlib_get_node_by_name (vm, (u8 *) "ip6-sv-reassembly-expire-walk");
ASSERT (node);
rm->ip6_sv_reass_expire_node_idx = node->index;
ip6_sv_reass_set_params (IP6_SV_REASS_TIMEOUT_DEFAULT_MS,
IP6_SV_REASS_MAX_REASSEMBLIES_DEFAULT,
IP6_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
IP6_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
nbuckets = ip6_sv_reass_get_nbuckets ();
clib_bihash_init_48_8 (&rm->hash, "ip6-sv-reass", nbuckets,
nbuckets * 1024);
node = vlib_get_node_by_name (vm, (u8 *) "ip6-drop");
ASSERT (node);
rm->ip6_drop_idx = node->index;
node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error");
ASSERT (node);
rm->ip6_icmp_error_idx = node->index;
if ((error = vlib_call_init_function (vm, ip_main_init)))
return error;
ip6_register_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION,
ip6_sv_reass_node.index);
rm->fq_index = vlib_frame_queue_main_init (ip6_sv_reass_node.index, 0);
rm->fq_feature_index =
vlib_frame_queue_main_init (ip6_sv_reass_node_feature.index, 0);
rm->feature_use_refcount_per_intf = NULL;
return error;
}
VLIB_INIT_FUNCTION (ip6_sv_reass_init_function);
#endif /* CLIB_MARCH_VARIANT */
static uword
ip6_sv_reass_walk_expired (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * f)
{
ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
uword event_type, *event_data = 0;
while (true)
{
vlib_process_wait_for_event_or_clock (vm,
(f64) rm->expire_walk_interval_ms
/ (f64) MSEC_PER_SEC);
event_type = vlib_process_get_events (vm, &event_data);
switch (event_type)
{
case ~0: /* no events => timeout */
/* nothing to do here */
break;
case IP6_EVENT_CONFIG_CHANGED:
break;
default:
clib_warning ("BUG: event type 0x%wx", event_type);
break;
}
f64 now = vlib_time_now (vm);
ip6_sv_reass_t *reass;
int *pool_indexes_to_free = NULL;
uword thread_index = 0;
int index;
const uword nthreads = vlib_num_workers () + 1;
for (thread_index = 0; thread_index < nthreads; ++thread_index)
{
ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
clib_spinlock_lock (&rt->lock);
vec_reset_length (pool_indexes_to_free);
/* *INDENT-OFF* */
pool_foreach_index (index, rt->pool, ({
reass = pool_elt_at_index (rt->pool, index);
if (now > reass->last_heard + rm->timeout)
{
vec_add1 (pool_indexes_to_free, index);
}
}));
/* *INDENT-ON* */
int *i;
/* *INDENT-OFF* */
vec_foreach (i, pool_indexes_to_free)
{
ip6_sv_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
ip6_sv_reass_free (vm, rm, rt, reass);
}
/* *INDENT-ON* */
clib_spinlock_unlock (&rt->lock);
}
vec_free (pool_indexes_to_free);
if (event_data)
{
_vec_len (event_data) = 0;
}
}
return 0;
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip6_sv_reass_expire_node) = {
.function = ip6_sv_reass_walk_expired,
.format_trace = format_ip6_sv_reass_trace,
.type = VLIB_NODE_TYPE_PROCESS,
.name = "ip6-sv-reassembly-expire-walk",
.n_errors = ARRAY_LEN (ip6_sv_reassembly_error_strings),
.error_strings = ip6_sv_reassembly_error_strings,
};
/* *INDENT-ON* */
static u8 *
format_ip6_sv_reass_key (u8 * s, va_list * args)
{
ip6_sv_reass_key_t *key = va_arg (*args, ip6_sv_reass_key_t *);
s = format (s, "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
key->xx_id, format_ip6_address, &key->src, format_ip6_address,
&key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
return s;
}
static u8 *
format_ip6_sv_reass (u8 * s, va_list * args)
{
vlib_main_t *vm = va_arg (*args, vlib_main_t *);
ip6_sv_reass_t *reass = va_arg (*args, ip6_sv_reass_t *);
s = format (s, "ID: %lu, key: %U, trace_op_counter: %u\n",
reass->id, format_ip6_sv_reass_key, &reass->key,
reass->trace_op_counter);
vlib_buffer_t *b;
u32 *bip;
u32 counter = 0;
vec_foreach (bip, reass->cached_buffers)
{
u32 bi = *bip;
do
{
b = vlib_get_buffer (vm, bi);
s = format (s, " #%03u: bi: %u\n", counter, bi);
++counter;
bi = b->next_buffer;
}
while (b->flags & VLIB_BUFFER_NEXT_PRESENT);
}
return s;
}
static clib_error_t *
show_ip6_sv_reass (vlib_main_t * vm, unformat_input_t * input,
CLIB_UNUSED (vlib_cli_command_t * lmd))
{
ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
vlib_cli_output (vm, "---------------------");
vlib_cli_output (vm, "IP6 reassembly status");
vlib_cli_output (vm, "---------------------");
bool details = false;
if (unformat (input, "details"))
{
details = true;
}
u32 sum_reass_n = 0;
u64 sum_buffers_n = 0;
ip6_sv_reass_t *reass;
uword thread_index;
const uword nthreads = vlib_num_workers () + 1;
for (thread_index = 0; thread_index < nthreads; ++thread_index)
{
ip6_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
clib_spinlock_lock (&rt->lock);
if (details)
{
/* *INDENT-OFF* */
pool_foreach (reass, rt->pool, {
vlib_cli_output (vm, "%U", format_ip6_sv_reass, vm, reass);
});
/* *INDENT-ON* */
}
sum_reass_n += rt->reass_n;
clib_spinlock_unlock (&rt->lock);
}
vlib_cli_output (vm, "---------------------");
vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n",
(long unsigned) sum_reass_n);
vlib_cli_output (vm,
"Maximum configured concurrent shallow virtual IP6 reassemblies per worker-thread: %lu\n",
(long unsigned) rm->max_reass_n);
vlib_cli_output (vm,
"Maximum configured shallow virtual IP6 reassembly timeout: %lums\n",
(long unsigned) rm->timeout_ms);
vlib_cli_output (vm,
"Maximum configured shallow virtual IP6 reassembly expire walk interval: %lums\n",
(long unsigned) rm->expire_walk_interval_ms);
vlib_cli_output (vm, "Buffers in use: %lu\n",
(long unsigned) sum_buffers_n);
return 0;
}
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (show_ip6_sv_reassembly_cmd, static) = {
.path = "show ip6-sv-reassembly",
.short_help = "show ip6-sv-reassembly [details]",
.function = show_ip6_sv_reass,
};
/* *INDENT-ON* */
#ifndef CLIB_MARCH_VARIANT
vnet_api_error_t
ip6_sv_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
{
return ip6_sv_reass_enable_disable_with_refcnt (sw_if_index,
enable_disable);
}
#endif /* CLIB_MARCH_VARIANT */
#define foreach_ip6_sv_reassembly_handoff_error \
_(CONGESTION_DROP, "congestion drop")
typedef enum
{
#define _(sym,str) IP6_SV_REASSEMBLY_HANDOFF_ERROR_##sym,
foreach_ip6_sv_reassembly_handoff_error
#undef _
IP6_SV_REASSEMBLY_HANDOFF_N_ERROR,
} ip6_sv_reassembly_handoff_error_t;
static char *ip6_sv_reassembly_handoff_error_strings[] = {
#define _(sym,string) string,
foreach_ip6_sv_reassembly_handoff_error
#undef _
};
typedef struct
{
u32 next_worker_index;
} ip6_sv_reassembly_handoff_trace_t;
static u8 *
format_ip6_sv_reassembly_handoff_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 *);
ip6_sv_reassembly_handoff_trace_t *t =
va_arg (*args, ip6_sv_reassembly_handoff_trace_t *);
s =
format (s, "ip6-sv-reassembly-handoff: next-worker %d",
t->next_worker_index);
return s;
}
always_inline uword
ip6_sv_reassembly_handoff_inline (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame, bool is_feature)
{
ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
u32 n_enq, n_left_from, *from;
u16 thread_indices[VLIB_FRAME_SIZE], *ti;
u32 fq_index;
from = vlib_frame_vector_args (frame);
n_left_from = frame->n_vectors;
vlib_get_buffers (vm, from, bufs, n_left_from);
b = bufs;
ti = thread_indices;
fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
while (n_left_from > 0)
{
ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
if (PREDICT_FALSE
((node->flags & VLIB_NODE_FLAG_TRACE)
&& (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
{
ip6_sv_reassembly_handoff_trace_t *t =
vlib_add_trace (vm, node, b[0], sizeof (*t));
t->next_worker_index = ti[0];
}
n_left_from -= 1;
ti += 1;
b += 1;
}
n_enq =
vlib_buffer_enqueue_to_thread (vm, fq_index, from, thread_indices,
frame->n_vectors, 1);
if (n_enq < frame->n_vectors)
vlib_node_increment_counter (vm, node->node_index,
IP6_SV_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
frame->n_vectors - n_enq);
return frame->n_vectors;
}
VLIB_NODE_FN (ip6_sv_reassembly_handoff_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
return ip6_sv_reassembly_handoff_inline (vm, node, frame,
false /* is_feature */ );
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip6_sv_reassembly_handoff_node) = {
.name = "ip6-sv-reassembly-handoff",
.vector_size = sizeof (u32),
.n_errors = ARRAY_LEN(ip6_sv_reassembly_handoff_error_strings),
.error_strings = ip6_sv_reassembly_handoff_error_strings,
.format_trace = format_ip6_sv_reassembly_handoff_trace,
.n_next_nodes = 1,
.next_nodes = {
[0] = "error-drop",
},
};
VLIB_NODE_FN (ip6_sv_reassembly_feature_handoff_node) (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * frame)
{
return ip6_sv_reassembly_handoff_inline (vm, node, frame, true /* is_feature */ );
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip6_sv_reassembly_feature_handoff_node) = {
.name = "ip6-sv-reass-feature-hoff",
.vector_size = sizeof (u32),
.n_errors = ARRAY_LEN(ip6_sv_reassembly_handoff_error_strings),
.error_strings = ip6_sv_reassembly_handoff_error_strings,
.format_trace = format_ip6_sv_reassembly_handoff_trace,
.n_next_nodes = 1,
.next_nodes = {
[0] = "error-drop",
},
};
/* *INDENT-ON* */
#ifndef CLIB_MARCH_VARIANT
int
ip6_sv_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
{
ip6_sv_reass_main_t *rm = &ip6_sv_reass_main;
vec_validate (rm->feature_use_refcount_per_intf, sw_if_index);
if (is_enable)
{
if (!rm->feature_use_refcount_per_intf[sw_if_index])
{
++rm->feature_use_refcount_per_intf[sw_if_index];
return vnet_feature_enable_disable ("ip6-unicast",
"ip6-sv-reassembly-feature",
sw_if_index, 1, 0, 0);
}
++rm->feature_use_refcount_per_intf[sw_if_index];
}
else
{
--rm->feature_use_refcount_per_intf[sw_if_index];
if (!rm->feature_use_refcount_per_intf[sw_if_index])
return vnet_feature_enable_disable ("ip6-unicast",
"ip6-sv-reassembly-feature",
sw_if_index, 0, 0, 0);
}
return 0;
}
#endif
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/