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gerrit.nordix.org / fdio / vpp / 63c0fd334e8762032580377926ac294409d3e625 / . / src / vnet / ip / reass / ip4_full_reass.c
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/*
* 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 IPv4 Full Reassembly.
*
* This file contains the source code for IPv4 full reassembly.
*/
#include <vppinfra/vec.h>
#include <vnet/vnet.h>
#include <vnet/ip/ip.h>
#include <vppinfra/fifo.h>
#include <vppinfra/bihash_16_8.h>
#include <vnet/ip/reass/ip4_full_reass.h>
#include <stddef.h>
#define MSEC_PER_SEC 1000
#define IP4_REASS_TIMEOUT_DEFAULT_MS 100
#define IP4_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000 // 10 seconds default
#define IP4_REASS_MAX_REASSEMBLIES_DEFAULT 1024
#define IP4_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3
#define IP4_REASS_HT_LOAD_FACTOR (0.75)
#define IP4_REASS_DEBUG_BUFFERS 0
#if IP4_REASS_DEBUG_BUFFERS
#define IP4_REASS_DEBUG_BUFFER(bi, what) \
do \
{ \
u32 _bi = bi; \
printf (#what "buffer %u", _bi); \
vlib_buffer_t *_b = vlib_get_buffer (vm, _bi); \
while (_b->flags & VLIB_BUFFER_NEXT_PRESENT) \
{ \
_bi = _b->next_buffer; \
printf ("[%u]", _bi); \
_b = vlib_get_buffer (vm, _bi); \
} \
printf ("\n"); \
fflush (stdout); \
} \
while (0)
#else
#define IP4_REASS_DEBUG_BUFFER(...)
#endif
typedef enum
{
IP4_REASS_RC_OK,
IP4_REASS_RC_TOO_MANY_FRAGMENTS,
IP4_REASS_RC_INTERNAL_ERROR,
IP4_REASS_RC_NO_BUF,
IP4_REASS_RC_HANDOFF,
} ip4_full_reass_rc_t;
typedef struct
{
union
{
struct
{
u32 xx_id;
ip4_address_t src;
ip4_address_t dst;
u16 frag_id;
u8 proto;
u8 unused;
};
u64 as_u64[2];
};
} ip4_full_reass_key_t;
typedef union
{
struct
{
u32 reass_index;
u32 memory_owner_thread_index;
};
u64 as_u64;
} ip4_full_reass_val_t;
typedef union
{
struct
{
ip4_full_reass_key_t k;
ip4_full_reass_val_t v;
};
clib_bihash_kv_16_8_t kv;
} ip4_full_reass_kv_t;
always_inline u32
ip4_full_reass_buffer_get_data_offset (vlib_buffer_t * b)
{
vnet_buffer_opaque_t *vnb = vnet_buffer (b);
return vnb->ip.reass.range_first - vnb->ip.reass.fragment_first;
}
always_inline u16
ip4_full_reass_buffer_get_data_len (vlib_buffer_t * b)
{
vnet_buffer_opaque_t *vnb = vnet_buffer (b);
return clib_min (vnb->ip.reass.range_last, vnb->ip.reass.fragment_last) -
(vnb->ip.reass.fragment_first +
ip4_full_reass_buffer_get_data_offset (b)) + 1;
}
typedef struct
{
// hash table key
ip4_full_reass_key_t key;
// time when last packet was received
f64 last_heard;
// internal id of this reassembly
u64 id;
// buffer index of first buffer in this reassembly context
u32 first_bi;
// last octet of packet, ~0 until fragment without more_fragments arrives
u32 last_packet_octet;
// length of data collected so far
u32 data_len;
// trace operation counter
u32 trace_op_counter;
// next index - used by non-feature node
u32 next_index;
// error next index - used by custom apps (~0 if not used)
u32 error_next_index;
// minimum fragment length for this reassembly - used to estimate MTU
u16 min_fragment_length;
// number of fragments in this reassembly
u32 fragments_n;
// thread owning memory for this context (whose pool contains this ctx)
u32 memory_owner_thread_index;
// thread which received fragment with offset 0 and which sends out the
// completed reassembly
u32 sendout_thread_index;
} ip4_full_reass_t;
typedef struct
{
ip4_full_reass_t *pool;
u32 reass_n;
u32 id_counter;
clib_spinlock_t lock;
} ip4_full_reass_per_thread_t;
typedef struct
{
// IPv4 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;
// IPv4 runtime
clib_bihash_16_8_t hash;
// per-thread data
ip4_full_reass_per_thread_t *per_thread_data;
// convenience
vlib_main_t *vlib_main;
// node index of ip4-drop node
u32 ip4_drop_idx;
u32 ip4_full_reass_expire_node_idx;
/** Worker handoff */
u32 fq_index;
u32 fq_feature_index;
u32 fq_custom_index;
// reference count for enabling/disabling feature - per interface
u32 *feature_use_refcount_per_intf;
} ip4_full_reass_main_t;
extern ip4_full_reass_main_t ip4_full_reass_main;
#ifndef CLIB_MARCH_VARIANT
ip4_full_reass_main_t ip4_full_reass_main;
#endif /* CLIB_MARCH_VARIANT */
typedef enum
{
IP4_FULL_REASS_NEXT_INPUT,
IP4_FULL_REASS_NEXT_DROP,
IP4_FULL_REASS_NEXT_HANDOFF,
IP4_FULL_REASS_N_NEXT,
} ip4_full_reass_next_t;
typedef enum
{
NORMAL,
FEATURE,
CUSTOM
} ip4_full_reass_node_type_t;
typedef enum
{
RANGE_NEW,
RANGE_SHRINK,
RANGE_DISCARD,
RANGE_OVERLAP,
FINALIZE,
HANDOFF,
} ip4_full_reass_trace_operation_e;
typedef struct
{
u16 range_first;
u16 range_last;
u32 range_bi;
i32 data_offset;
u32 data_len;
u32 first_bi;
} ip4_full_reass_range_trace_t;
typedef struct
{
ip4_full_reass_trace_operation_e action;
u32 reass_id;
ip4_full_reass_range_trace_t trace_range;
u32 size_diff;
u32 op_id;
u32 thread_id;
u32 thread_id_to;
u32 fragment_first;
u32 fragment_last;
u32 total_data_len;
bool is_after_handoff;
ip4_header_t ip4_header;
} ip4_full_reass_trace_t;
extern vlib_node_registration_t ip4_full_reass_node;
extern vlib_node_registration_t ip4_full_reass_node_feature;
extern vlib_node_registration_t ip4_full_reass_node_custom;
static void
ip4_full_reass_trace_details (vlib_main_t * vm, u32 bi,
ip4_full_reass_range_trace_t * trace)
{
vlib_buffer_t *b = vlib_get_buffer (vm, bi);
vnet_buffer_opaque_t *vnb = vnet_buffer (b);
trace->range_first = vnb->ip.reass.range_first;
trace->range_last = vnb->ip.reass.range_last;
trace->data_offset = ip4_full_reass_buffer_get_data_offset (b);
trace->data_len = ip4_full_reass_buffer_get_data_len (b);
trace->range_bi = bi;
}
static u8 *
format_ip4_full_reass_range_trace (u8 * s, va_list * args)
{
ip4_full_reass_range_trace_t *trace =
va_arg (*args, ip4_full_reass_range_trace_t *);
s =
format (s, "range: [%u, %u], off %d, len %u, bi %u", trace->range_first,
trace->range_last, trace->data_offset, trace->data_len,
trace->range_bi);
return s;
}
static u8 *
format_ip4_full_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 *);
ip4_full_reass_trace_t *t = va_arg (*args, ip4_full_reass_trace_t *);
u32 indent = 0;
if (~0 != t->reass_id)
{
if (t->is_after_handoff)
{
s =
format (s, "%U\n", format_ip4_header, &t->ip4_header,
sizeof (t->ip4_header));
indent = 2;
}
s =
format (s, "%Ureass id: %u, op id: %u, ", format_white_space, indent,
t->reass_id, t->op_id);
indent = format_get_indent (s);
s =
format (s,
"first bi: %u, data len: %u, ip/fragment[%u, %u]",
t->trace_range.first_bi, t->total_data_len, t->fragment_first,
t->fragment_last);
}
switch (t->action)
{
case RANGE_SHRINK:
s = format (s, "\n%Ushrink %U by %u", format_white_space, indent,
format_ip4_full_reass_range_trace, &t->trace_range,
t->size_diff);
break;
case RANGE_DISCARD:
s = format (s, "\n%Udiscard %U", format_white_space, indent,
format_ip4_full_reass_range_trace, &t->trace_range);
break;
case RANGE_NEW:
s = format (s, "\n%Unew %U", format_white_space, indent,
format_ip4_full_reass_range_trace, &t->trace_range);
break;
case RANGE_OVERLAP:
s = format (s, "\n%Uoverlapping/ignored %U", format_white_space, indent,
format_ip4_full_reass_range_trace, &t->trace_range);
break;
case FINALIZE:
s = format (s, "\n%Ufinalize reassembly", format_white_space, indent);
break;
case HANDOFF:
s =
format (s, "handoff from thread #%u to thread #%u", t->thread_id,
t->thread_id_to);
break;
}
return s;
}
static void
ip4_full_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
ip4_full_reass_main_t * rm,
ip4_full_reass_t * reass, u32 bi,
ip4_full_reass_trace_operation_e action,
u32 size_diff, u32 thread_id_to)
{
vlib_buffer_t *b = vlib_get_buffer (vm, bi);
vnet_buffer_opaque_t *vnb = vnet_buffer (b);
if (pool_is_free_index
(vm->trace_main.trace_buffer_pool, vlib_buffer_get_trace_index (b)))
{
// this buffer's trace is gone
b->flags &= ~VLIB_BUFFER_IS_TRACED;
return;
}
bool is_after_handoff = false;
if (vlib_buffer_get_trace_thread (b) != vm->thread_index)
{
is_after_handoff = true;
}
ip4_full_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
t->is_after_handoff = is_after_handoff;
if (t->is_after_handoff)
{
clib_memcpy (&t->ip4_header, vlib_buffer_get_current (b),
clib_min (sizeof (t->ip4_header), b->current_length));
}
if (reass)
{
t->reass_id = reass->id;
t->op_id = reass->trace_op_counter;
t->trace_range.first_bi = reass->first_bi;
t->total_data_len = reass->data_len;
++reass->trace_op_counter;
}
else
{
t->reass_id = ~0;
t->op_id = 0;
t->trace_range.first_bi = 0;
t->total_data_len = 0;
}
t->action = action;
ip4_full_reass_trace_details (vm, bi, &t->trace_range);
t->size_diff = size_diff;
t->thread_id = vm->thread_index;
t->thread_id_to = thread_id_to;
t->fragment_first = vnb->ip.reass.fragment_first;
t->fragment_last = vnb->ip.reass.fragment_last;
#if 0
static u8 *s = NULL;
s = format (s, "%U", format_ip4_full_reass_trace, NULL, NULL, t);
printf ("%.*s\n", vec_len (s), s);
fflush (stdout);
vec_reset_length (s);
#endif
}
always_inline void
ip4_full_reass_free_ctx (ip4_full_reass_per_thread_t * rt,
ip4_full_reass_t * reass)
{
pool_put (rt->pool, reass);
--rt->reass_n;
}
always_inline void
ip4_full_reass_free (ip4_full_reass_main_t * rm,
ip4_full_reass_per_thread_t * rt,
ip4_full_reass_t * reass)
{
clib_bihash_kv_16_8_t kv;
kv.key[0] = reass->key.as_u64[0];
kv.key[1] = reass->key.as_u64[1];
clib_bihash_add_del_16_8 (&rm->hash, &kv, 0);
return ip4_full_reass_free_ctx (rt, reass);
}
always_inline void
ip4_full_reass_drop_all (vlib_main_t * vm, vlib_node_runtime_t * node,
ip4_full_reass_main_t * rm, ip4_full_reass_t * reass)
{
u32 range_bi = reass->first_bi;
vlib_buffer_t *range_b;
vnet_buffer_opaque_t *range_vnb;
u32 *to_free = NULL;
while (~0 != range_bi)
{
range_b = vlib_get_buffer (vm, range_bi);
range_vnb = vnet_buffer (range_b);
u32 bi = range_bi;
while (~0 != bi)
{
vec_add1 (to_free, bi);
vlib_buffer_t *b = vlib_get_buffer (vm, bi);
if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
{
bi = b->next_buffer;
b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
}
else
{
bi = ~0;
}
}
range_bi = range_vnb->ip.reass.next_range_bi;
}
/* send to next_error_index */
if (~0 != reass->error_next_index)
{
u32 n_left_to_next, *to_next, next_index;
next_index = reass->error_next_index;
u32 bi = ~0;
while (vec_len (to_free) > 0)
{
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
while (vec_len (to_free) > 0 && n_left_to_next > 0)
{
bi = vec_pop (to_free);
if (~0 != bi)
{
to_next[0] = bi;
to_next += 1;
n_left_to_next -= 1;
}
}
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
}
}
else
{
vlib_buffer_free (vm, to_free, vec_len (to_free));
}
vec_free (to_free);
}
always_inline void
ip4_full_reass_init (ip4_full_reass_t * reass)
{
reass->first_bi = ~0;
reass->last_packet_octet = ~0;
reass->data_len = 0;
reass->next_index = ~0;
reass->error_next_index = ~0;
}
always_inline ip4_full_reass_t *
ip4_full_reass_find_or_create (vlib_main_t * vm, vlib_node_runtime_t * node,
ip4_full_reass_main_t * rm,
ip4_full_reass_per_thread_t * rt,
ip4_full_reass_kv_t * kv, u8 * do_handoff)
{
ip4_full_reass_t *reass;
f64 now;
again:
reass = NULL;
now = vlib_time_now (vm);
if (!clib_bihash_search_16_8 (&rm->hash, &kv->kv, &kv->kv))
{
if (vm->thread_index != kv->v.memory_owner_thread_index)
{
*do_handoff = 1;
return NULL;
}
reass =
pool_elt_at_index (rm->per_thread_data
[kv->v.memory_owner_thread_index].pool,
kv->v.reass_index);
if (now > reass->last_heard + rm->timeout)
{
ip4_full_reass_drop_all (vm, node, rm, reass);
ip4_full_reass_free (rm, rt, reass);
reass = NULL;
}
}
if (reass)
{
reass->last_heard = now;
return reass;
}
if (rt->reass_n >= rm->max_reass_n)
{
reass = NULL;
return reass;
}
else
{
pool_get (rt->pool, reass);
clib_memset (reass, 0, sizeof (*reass));
reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
reass->memory_owner_thread_index = vm->thread_index;
++rt->id_counter;
ip4_full_reass_init (reass);
++rt->reass_n;
}
reass->key.as_u64[0] = kv->kv.key[0];
reass->key.as_u64[1] = kv->kv.key[1];
kv->v.reass_index = (reass - rt->pool);
kv->v.memory_owner_thread_index = vm->thread_index;
reass->last_heard = now;
int rv = clib_bihash_add_del_16_8 (&rm->hash, &kv->kv, 2);
if (rv)
{
ip4_full_reass_free_ctx (rt, reass);
reass = NULL;
// if other worker created a context already work with the other copy
if (-2 == rv)
goto again;
}
return reass;
}
always_inline ip4_full_reass_rc_t
ip4_full_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node,
ip4_full_reass_main_t * rm,
ip4_full_reass_per_thread_t * rt,
ip4_full_reass_t * reass, u32 * bi0,
u32 * next0, u32 * error0, bool is_custom)
{
vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi);
vlib_buffer_t *last_b = NULL;
u32 sub_chain_bi = reass->first_bi;
u32 total_length = 0;
u32 buf_cnt = 0;
do
{
u32 tmp_bi = sub_chain_bi;
vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi);
ip4_header_t *ip = vlib_buffer_get_current (tmp);
vnet_buffer_opaque_t *vnb = vnet_buffer (tmp);
if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
!(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
{
return IP4_REASS_RC_INTERNAL_ERROR;
}
u32 data_len = ip4_full_reass_buffer_get_data_len (tmp);
u32 trim_front =
ip4_header_bytes (ip) + ip4_full_reass_buffer_get_data_offset (tmp);
u32 trim_end =
vlib_buffer_length_in_chain (vm, tmp) - trim_front - data_len;
if (tmp_bi == reass->first_bi)
{
/* first buffer - keep ip4 header */
if (0 != ip4_full_reass_buffer_get_data_offset (tmp))
{
return IP4_REASS_RC_INTERNAL_ERROR;
}
trim_front = 0;
trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len -
ip4_header_bytes (ip);
if (!(vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0))
{
return IP4_REASS_RC_INTERNAL_ERROR;
}
}
u32 keep_data =
vlib_buffer_length_in_chain (vm, tmp) - trim_front - trim_end;
while (1)
{
++buf_cnt;
if (trim_front)
{
if (trim_front > tmp->current_length)
{
/* drop whole buffer */
u32 to_be_freed_bi = tmp_bi;
trim_front -= tmp->current_length;
if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
{
return IP4_REASS_RC_INTERNAL_ERROR;
}
tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
tmp_bi = tmp->next_buffer;
tmp->next_buffer = 0;
tmp = vlib_get_buffer (vm, tmp_bi);
vlib_buffer_free_one (vm, to_be_freed_bi);
continue;
}
else
{
vlib_buffer_advance (tmp, trim_front);
trim_front = 0;
}
}
if (keep_data)
{
if (last_b)
{
last_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
last_b->next_buffer = tmp_bi;
}
last_b = tmp;
if (keep_data <= tmp->current_length)
{
tmp->current_length = keep_data;
keep_data = 0;
}
else
{
keep_data -= tmp->current_length;
if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
{
return IP4_REASS_RC_INTERNAL_ERROR;
}
}
total_length += tmp->current_length;
if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
{
tmp_bi = tmp->next_buffer;
tmp = vlib_get_buffer (vm, tmp->next_buffer);
}
else
{
break;
}
}
else
{
u32 to_be_freed_bi = tmp_bi;
if (reass->first_bi == tmp_bi)
{
return IP4_REASS_RC_INTERNAL_ERROR;
}
if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
{
tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
tmp_bi = tmp->next_buffer;
tmp->next_buffer = 0;
tmp = vlib_get_buffer (vm, tmp_bi);
vlib_buffer_free_one (vm, to_be_freed_bi);
}
else
{
tmp->next_buffer = 0;
vlib_buffer_free_one (vm, to_be_freed_bi);
break;
}
}
}
sub_chain_bi =
vnet_buffer (vlib_get_buffer (vm, sub_chain_bi))->ip.
reass.next_range_bi;
}
while (~0 != sub_chain_bi);
if (!last_b)
{
return IP4_REASS_RC_INTERNAL_ERROR;
}
last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
if (total_length < first_b->current_length)
{
return IP4_REASS_RC_INTERNAL_ERROR;
}
total_length -= first_b->current_length;
first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
first_b->total_length_not_including_first_buffer = total_length;
ip4_header_t *ip = vlib_buffer_get_current (first_b);
ip->flags_and_fragment_offset = 0;
ip->length = clib_host_to_net_u16 (first_b->current_length + total_length);
ip->checksum = ip4_header_checksum (ip);
if (!vlib_buffer_chain_linearize (vm, first_b))
{
return IP4_REASS_RC_NO_BUF;
}
// reset to reconstruct the mbuf linking
first_b->flags &= ~VLIB_BUFFER_EXT_HDR_VALID;
if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED))
{
ip4_full_reass_add_trace (vm, node, rm, reass, reass->first_bi,
FINALIZE, 0, ~0);
#if 0
// following code does a hexdump of packet fragments to stdout ...
do
{
u32 bi = reass->first_bi;
u8 *s = NULL;
while (~0 != bi)
{
vlib_buffer_t *b = vlib_get_buffer (vm, bi);
s = format (s, "%u: %U\n", bi, format_hexdump,
vlib_buffer_get_current (b), b->current_length);
if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
{
bi = b->next_buffer;
}
else
{
break;
}
}
printf ("%.*s\n", vec_len (s), s);
fflush (stdout);
vec_free (s);
}
while (0);
#endif
}
*bi0 = reass->first_bi;
if (!is_custom)
{
*next0 = IP4_FULL_REASS_NEXT_INPUT;
}
else
{
*next0 = reass->next_index;
}
vnet_buffer (first_b)->ip.reass.estimated_mtu = reass->min_fragment_length;
*error0 = IP4_ERROR_NONE;
ip4_full_reass_free (rm, rt, reass);
reass = NULL;
return IP4_REASS_RC_OK;
}
always_inline ip4_full_reass_rc_t
ip4_full_reass_insert_range_in_chain (vlib_main_t * vm,
ip4_full_reass_main_t * rm,
ip4_full_reass_per_thread_t * rt,
ip4_full_reass_t * reass,
u32 prev_range_bi, u32 new_next_bi)
{
vlib_buffer_t *new_next_b = vlib_get_buffer (vm, new_next_bi);
vnet_buffer_opaque_t *new_next_vnb = vnet_buffer (new_next_b);
if (~0 != prev_range_bi)
{
vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
new_next_vnb->ip.reass.next_range_bi = prev_vnb->ip.reass.next_range_bi;
prev_vnb->ip.reass.next_range_bi = new_next_bi;
}
else
{
if (~0 != reass->first_bi)
{
new_next_vnb->ip.reass.next_range_bi = reass->first_bi;
}
reass->first_bi = new_next_bi;
}
vnet_buffer_opaque_t *vnb = vnet_buffer (new_next_b);
if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
!(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
{
return IP4_REASS_RC_INTERNAL_ERROR;
}
reass->data_len += ip4_full_reass_buffer_get_data_len (new_next_b);
return IP4_REASS_RC_OK;
}
always_inline ip4_full_reass_rc_t
ip4_full_reass_remove_range_from_chain (vlib_main_t * vm,
vlib_node_runtime_t * node,
ip4_full_reass_main_t * rm,
ip4_full_reass_t * reass,
u32 prev_range_bi, u32 discard_bi)
{
vlib_buffer_t *discard_b = vlib_get_buffer (vm, discard_bi);
vnet_buffer_opaque_t *discard_vnb = vnet_buffer (discard_b);
if (~0 != prev_range_bi)
{
vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
if (!(prev_vnb->ip.reass.next_range_bi == discard_bi))
{
return IP4_REASS_RC_INTERNAL_ERROR;
}
prev_vnb->ip.reass.next_range_bi = discard_vnb->ip.reass.next_range_bi;
}
else
{
reass->first_bi = discard_vnb->ip.reass.next_range_bi;
}
vnet_buffer_opaque_t *vnb = vnet_buffer (discard_b);
if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) &&
!(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first))
{
return IP4_REASS_RC_INTERNAL_ERROR;
}
reass->data_len -= ip4_full_reass_buffer_get_data_len (discard_b);
while (1)
{
u32 to_be_freed_bi = discard_bi;
if (PREDICT_FALSE (discard_b->flags & VLIB_BUFFER_IS_TRACED))
{
ip4_full_reass_add_trace (vm, node, rm, reass, discard_bi,
RANGE_DISCARD, 0, ~0);
}
if (discard_b->flags & VLIB_BUFFER_NEXT_PRESENT)
{
discard_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
discard_bi = discard_b->next_buffer;
discard_b->next_buffer = 0;
discard_b = vlib_get_buffer (vm, discard_bi);
vlib_buffer_free_one (vm, to_be_freed_bi);
}
else
{
discard_b->next_buffer = 0;
vlib_buffer_free_one (vm, to_be_freed_bi);
break;
}
}
return IP4_REASS_RC_OK;
}
always_inline ip4_full_reass_rc_t
ip4_full_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
ip4_full_reass_main_t * rm,
ip4_full_reass_per_thread_t * rt,
ip4_full_reass_t * reass, u32 * bi0, u32 * next0,
u32 * error0, bool is_custom, u32 * handoff_thread_idx)
{
vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
if (is_custom)
{
// store (error_)next_index before it's overwritten
reass->next_index = fvnb->ip.reass.next_index;
reass->error_next_index = fvnb->ip.reass.error_next_index;
}
ip4_full_reass_rc_t rc = IP4_REASS_RC_OK;
int consumed = 0;
ip4_header_t *fip = vlib_buffer_get_current (fb);
const u32 fragment_first = ip4_get_fragment_offset_bytes (fip);
const u32 fragment_length =
clib_net_to_host_u16 (fip->length) - ip4_header_bytes (fip);
const u32 fragment_last = fragment_first + fragment_length - 1;
fvnb->ip.reass.fragment_first = fragment_first;
fvnb->ip.reass.fragment_last = fragment_last;
int more_fragments = ip4_get_fragment_more (fip);
u32 candidate_range_bi = reass->first_bi;
u32 prev_range_bi = ~0;
fvnb->ip.reass.range_first = fragment_first;
fvnb->ip.reass.range_last = fragment_last;
fvnb->ip.reass.next_range_bi = ~0;
if (!more_fragments)
{
reass->last_packet_octet = fragment_last;
}
if (~0 == reass->first_bi)
{
// starting a new reassembly
rc =
ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass,
prev_range_bi, *bi0);
if (IP4_REASS_RC_OK != rc)
{
return rc;
}
if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
{
ip4_full_reass_add_trace (vm, node, rm, reass, *bi0, RANGE_NEW, 0,
~0);
}
*bi0 = ~0;
reass->min_fragment_length = clib_net_to_host_u16 (fip->length);
reass->fragments_n = 1;
return IP4_REASS_RC_OK;
}
reass->min_fragment_length =
clib_min (clib_net_to_host_u16 (fip->length),
fvnb->ip.reass.estimated_mtu);
while (~0 != candidate_range_bi)
{
vlib_buffer_t *candidate_b = vlib_get_buffer (vm, candidate_range_bi);
vnet_buffer_opaque_t *candidate_vnb = vnet_buffer (candidate_b);
if (fragment_first > candidate_vnb->ip.reass.range_last)
{
// this fragments starts after candidate range
prev_range_bi = candidate_range_bi;
candidate_range_bi = candidate_vnb->ip.reass.next_range_bi;
if (candidate_vnb->ip.reass.range_last < fragment_last &&
~0 == candidate_range_bi)
{
// special case - this fragment falls beyond all known ranges
rc =
ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass,
prev_range_bi, *bi0);
if (IP4_REASS_RC_OK != rc)
{
return rc;
}
consumed = 1;
break;
}
continue;
}
if (fragment_last < candidate_vnb->ip.reass.range_first)
{
// this fragment ends before candidate range without any overlap
rc =
ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass,
prev_range_bi, *bi0);
if (IP4_REASS_RC_OK != rc)
{
return rc;
}
consumed = 1;
}
else
{
if (fragment_first >= candidate_vnb->ip.reass.range_first &&
fragment_last <= candidate_vnb->ip.reass.range_last)
{
// this fragment is a (sub)part of existing range, ignore it
if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
{
ip4_full_reass_add_trace (vm, node, rm, reass, *bi0,
RANGE_OVERLAP, 0, ~0);
}
break;
}
int discard_candidate = 0;
if (fragment_first < candidate_vnb->ip.reass.range_first)
{
u32 overlap =
fragment_last - candidate_vnb->ip.reass.range_first + 1;
if (overlap < ip4_full_reass_buffer_get_data_len (candidate_b))
{
candidate_vnb->ip.reass.range_first += overlap;
if (reass->data_len < overlap)
{
return IP4_REASS_RC_INTERNAL_ERROR;
}
reass->data_len -= overlap;
if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
{
ip4_full_reass_add_trace (vm, node, rm, reass,
candidate_range_bi,
RANGE_SHRINK, 0, ~0);
}
rc =
ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass,
prev_range_bi,
*bi0);
if (IP4_REASS_RC_OK != rc)
{
return rc;
}
consumed = 1;
}
else
{
discard_candidate = 1;
}
}
else if (fragment_last > candidate_vnb->ip.reass.range_last)
{
u32 overlap =
candidate_vnb->ip.reass.range_last - fragment_first + 1;
if (overlap < ip4_full_reass_buffer_get_data_len (candidate_b))
{
fvnb->ip.reass.range_first += overlap;
if (~0 != candidate_vnb->ip.reass.next_range_bi)
{
prev_range_bi = candidate_range_bi;
candidate_range_bi =
candidate_vnb->ip.reass.next_range_bi;
continue;
}
else
{
// special case - last range discarded
rc =
ip4_full_reass_insert_range_in_chain (vm, rm, rt,
reass,
candidate_range_bi,
*bi0);
if (IP4_REASS_RC_OK != rc)
{
return rc;
}
consumed = 1;
}
}
else
{
discard_candidate = 1;
}
}
else
{
discard_candidate = 1;
}
if (discard_candidate)
{
u32 next_range_bi = candidate_vnb->ip.reass.next_range_bi;
// discard candidate range, probe next range
rc =
ip4_full_reass_remove_range_from_chain (vm, node, rm, reass,
prev_range_bi,
candidate_range_bi);
if (IP4_REASS_RC_OK != rc)
{
return rc;
}
if (~0 != next_range_bi)
{
candidate_range_bi = next_range_bi;
continue;
}
else
{
// special case - last range discarded
rc =
ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass,
prev_range_bi,
*bi0);
if (IP4_REASS_RC_OK != rc)
{
return rc;
}
consumed = 1;
}
}
}
break;
}
++reass->fragments_n;
if (consumed)
{
if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
{
ip4_full_reass_add_trace (vm, node, rm, reass, *bi0, RANGE_NEW, 0,
~0);
}
}
if (~0 != reass->last_packet_octet &&
reass->data_len == reass->last_packet_octet + 1)
{
*handoff_thread_idx = reass->sendout_thread_index;
int handoff =
reass->memory_owner_thread_index != reass->sendout_thread_index;
rc =
ip4_full_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0,
is_custom);
if (IP4_REASS_RC_OK == rc && handoff)
{
rc = IP4_REASS_RC_HANDOFF;
}
}
else
{
if (consumed)
{
*bi0 = ~0;
if (reass->fragments_n > rm->max_reass_len)
{
rc = IP4_REASS_RC_TOO_MANY_FRAGMENTS;
}
}
else
{
*next0 = IP4_FULL_REASS_NEXT_DROP;
*error0 = IP4_ERROR_REASS_DUPLICATE_FRAGMENT;
}
}
return rc;
}
always_inline uword
ip4_full_reass_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
vlib_frame_t * frame, ip4_full_reass_node_type_t type)
{
u32 *from = vlib_frame_vector_args (frame);
u32 n_left_from, n_left_to_next, *to_next, next_index;
ip4_full_reass_main_t *rm = &ip4_full_reass_main;
ip4_full_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;
u32 error0 = IP4_ERROR_NONE;
bi0 = from[0];
b0 = vlib_get_buffer (vm, bi0);
ip4_header_t *ip0 = vlib_buffer_get_current (b0);
if (!ip4_get_fragment_more (ip0) && !ip4_get_fragment_offset (ip0))
{
// this is a whole packet - no fragmentation
if (CUSTOM != type)
{
next0 = IP4_FULL_REASS_NEXT_INPUT;
}
else
{
next0 = vnet_buffer (b0)->ip.reass.next_index;
}
goto packet_enqueue;
}
const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0);
const u32 fragment_length =
clib_net_to_host_u16 (ip0->length) - ip4_header_bytes (ip0);
const u32 fragment_last = fragment_first + fragment_length - 1;
if (fragment_first > fragment_last || fragment_first + fragment_length > UINT16_MAX - 20 || (fragment_length < 8 && ip4_get_fragment_more (ip0))) // 8 is minimum frag length per RFC 791
{
next0 = IP4_FULL_REASS_NEXT_DROP;
error0 = IP4_ERROR_REASS_MALFORMED_PACKET;
goto packet_enqueue;
}
ip4_full_reass_kv_t kv;
u8 do_handoff = 0;
kv.k.as_u64[0] =
(u64) vec_elt (ip4_main.fib_index_by_sw_if_index,
vnet_buffer (b0)->sw_if_index[VLIB_RX]) |
(u64) ip0->src_address.as_u32 << 32;
kv.k.as_u64[1] =
(u64) ip0->dst_address.
as_u32 | (u64) ip0->fragment_id << 32 | (u64) ip0->protocol << 48;
ip4_full_reass_t *reass =
ip4_full_reass_find_or_create (vm, node, rm, rt, &kv,
&do_handoff);
if (reass)
{
const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0);
if (0 == fragment_first)
{
reass->sendout_thread_index = vm->thread_index;
}
}
if (PREDICT_FALSE (do_handoff))
{
next0 = IP4_FULL_REASS_NEXT_HANDOFF;
vnet_buffer (b0)->ip.reass.owner_thread_index =
kv.v.memory_owner_thread_index;
}
else if (reass)
{
u32 handoff_thread_idx;
switch (ip4_full_reass_update
(vm, node, rm, rt, reass, &bi0, &next0,
&error0, CUSTOM == type, &handoff_thread_idx))
{
case IP4_REASS_RC_OK:
/* nothing to do here */
break;
case IP4_REASS_RC_HANDOFF:
next0 = IP4_FULL_REASS_NEXT_HANDOFF;
b0 = vlib_get_buffer (vm, bi0);
vnet_buffer (b0)->ip.reass.owner_thread_index =
handoff_thread_idx;
break;
case IP4_REASS_RC_TOO_MANY_FRAGMENTS:
vlib_node_increment_counter (vm, node->node_index,
IP4_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
1);
ip4_full_reass_drop_all (vm, node, rm, reass);
ip4_full_reass_free (rm, rt, reass);
goto next_packet;
break;
case IP4_REASS_RC_NO_BUF:
vlib_node_increment_counter (vm, node->node_index,
IP4_ERROR_REASS_NO_BUF, 1);
ip4_full_reass_drop_all (vm, node, rm, reass);
ip4_full_reass_free (rm, rt, reass);
goto next_packet;
break;
case IP4_REASS_RC_INTERNAL_ERROR:
/* drop everything and start with a clean slate */
vlib_node_increment_counter (vm, node->node_index,
IP4_ERROR_REASS_INTERNAL_ERROR,
1);
ip4_full_reass_drop_all (vm, node, rm, reass);
ip4_full_reass_free (rm, rt, reass);
goto next_packet;
break;
}
}
else
{
next0 = IP4_FULL_REASS_NEXT_DROP;
error0 = IP4_ERROR_REASS_LIMIT_REACHED;
}
packet_enqueue:
if (bi0 != ~0)
{
to_next[0] = bi0;
to_next += 1;
n_left_to_next -= 1;
/* bi0 might have been updated by reass_finalize, reload */
b0 = vlib_get_buffer (vm, bi0);
if (IP4_ERROR_NONE != error0)
{
b0->error = node->errors[error0];
}
if (next0 == IP4_FULL_REASS_NEXT_HANDOFF)
{
if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
{
ip4_full_reass_add_trace (vm, node, rm, NULL, bi0,
HANDOFF, 0,
vnet_buffer (b0)->ip.
reass.owner_thread_index);
}
}
else if (FEATURE == type && IP4_ERROR_NONE == error0)
{
vnet_feature_next (&next0, b0);
}
vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
to_next, n_left_to_next,
bi0, next0);
IP4_REASS_DEBUG_BUFFER (bi0, enqueue_next);
}
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 *ip4_full_reass_error_strings[] = {
#define _(sym, string) string,
foreach_ip4_error
#undef _
};
VLIB_NODE_FN (ip4_full_reass_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
return ip4_full_reass_inline (vm, node, frame, NORMAL);
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip4_full_reass_node) = {
.name = "ip4-full-reassembly",
.vector_size = sizeof (u32),
.format_trace = format_ip4_full_reass_trace,
.n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
.error_strings = ip4_full_reass_error_strings,
.n_next_nodes = IP4_FULL_REASS_N_NEXT,
.next_nodes =
{
[IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
[IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
[IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-full-reassembly-handoff",
},
};
/* *INDENT-ON* */
VLIB_NODE_FN (ip4_full_reass_node_feature) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
return ip4_full_reass_inline (vm, node, frame, FEATURE);
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip4_full_reass_node_feature) = {
.name = "ip4-full-reassembly-feature",
.vector_size = sizeof (u32),
.format_trace = format_ip4_full_reass_trace,
.n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
.error_strings = ip4_full_reass_error_strings,
.n_next_nodes = IP4_FULL_REASS_N_NEXT,
.next_nodes =
{
[IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
[IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
[IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-full-reass-feature-hoff",
},
};
/* *INDENT-ON* */
/* *INDENT-OFF* */
VNET_FEATURE_INIT (ip4_full_reass_feature, static) = {
.arc_name = "ip4-unicast",
.node_name = "ip4-full-reassembly-feature",
.runs_before = VNET_FEATURES ("ip4-lookup",
"ipsec4-input-feature"),
.runs_after = 0,
};
/* *INDENT-ON* */
VLIB_NODE_FN (ip4_full_reass_node_custom) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
return ip4_full_reass_inline (vm, node, frame, CUSTOM);
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip4_full_reass_node_custom) = {
.name = "ip4-full-reassembly-custom",
.vector_size = sizeof (u32),
.format_trace = format_ip4_full_reass_trace,
.n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
.error_strings = ip4_full_reass_error_strings,
.n_next_nodes = IP4_FULL_REASS_N_NEXT,
.next_nodes =
{
[IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
[IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
[IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-full-reass-custom-hoff",
},
};
/* *INDENT-ON* */
/* *INDENT-OFF* */
VNET_FEATURE_INIT (ip4_full_reass_custom, static) = {
.arc_name = "ip4-unicast",
.node_name = "ip4-full-reassembly-feature",
.runs_before = VNET_FEATURES ("ip4-lookup",
"ipsec4-input-feature"),
.runs_after = 0,
};
/* *INDENT-ON* */
#ifndef CLIB_MARCH_VARIANT
uword
ip4_full_reass_custom_register_next_node (uword node_index)
{
return vlib_node_add_next (vlib_get_main (),
ip4_full_reass_node_custom.index, node_index);
}
always_inline u32
ip4_full_reass_get_nbuckets ()
{
ip4_full_reass_main_t *rm = &ip4_full_reass_main;
u32 nbuckets;
u8 i;
nbuckets = (u32) (rm->max_reass_n / IP4_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
{
IP4_EVENT_CONFIG_CHANGED = 1,
} ip4_full_reass_event_t;
typedef struct
{
int failure;
clib_bihash_16_8_t *new_hash;
} ip4_rehash_cb_ctx;
#ifndef CLIB_MARCH_VARIANT
static int
ip4_rehash_cb (clib_bihash_kv_16_8_t * kv, void *_ctx)
{
ip4_rehash_cb_ctx *ctx = _ctx;
if (clib_bihash_add_del_16_8 (ctx->new_hash, kv, 1))
{
ctx->failure = 1;
}
return (BIHASH_WALK_CONTINUE);
}
static void
ip4_full_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
u32 max_reassembly_length,
u32 expire_walk_interval_ms)
{
ip4_full_reass_main.timeout_ms = timeout_ms;
ip4_full_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
ip4_full_reass_main.max_reass_n = max_reassemblies;
ip4_full_reass_main.max_reass_len = max_reassembly_length;
ip4_full_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
}
vnet_api_error_t
ip4_full_reass_set (u32 timeout_ms, u32 max_reassemblies,
u32 max_reassembly_length, u32 expire_walk_interval_ms)
{
u32 old_nbuckets = ip4_full_reass_get_nbuckets ();
ip4_full_reass_set_params (timeout_ms, max_reassemblies,
max_reassembly_length, expire_walk_interval_ms);
vlib_process_signal_event (ip4_full_reass_main.vlib_main,
ip4_full_reass_main.ip4_full_reass_expire_node_idx,
IP4_EVENT_CONFIG_CHANGED, 0);
u32 new_nbuckets = ip4_full_reass_get_nbuckets ();
if (ip4_full_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
{
clib_bihash_16_8_t new_hash;
clib_memset (&new_hash, 0, sizeof (new_hash));
ip4_rehash_cb_ctx ctx;
ctx.failure = 0;
ctx.new_hash = &new_hash;
clib_bihash_init_16_8 (&new_hash, "ip4-dr", new_nbuckets,
new_nbuckets * 1024);
clib_bihash_foreach_key_value_pair_16_8 (&ip4_full_reass_main.hash,
ip4_rehash_cb, &ctx);
if (ctx.failure)
{
clib_bihash_free_16_8 (&new_hash);
return -1;
}
else
{
clib_bihash_free_16_8 (&ip4_full_reass_main.hash);
clib_memcpy_fast (&ip4_full_reass_main.hash, &new_hash,
sizeof (ip4_full_reass_main.hash));
clib_bihash_copied (&ip4_full_reass_main.hash, &new_hash);
}
}
return 0;
}
vnet_api_error_t
ip4_full_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
u32 * max_reassembly_length,
u32 * expire_walk_interval_ms)
{
*timeout_ms = ip4_full_reass_main.timeout_ms;
*max_reassemblies = ip4_full_reass_main.max_reass_n;
*max_reassembly_length = ip4_full_reass_main.max_reass_len;
*expire_walk_interval_ms = ip4_full_reass_main.expire_walk_interval_ms;
return 0;
}
static clib_error_t *
ip4_full_reass_init_function (vlib_main_t * vm)
{
ip4_full_reass_main_t *rm = &ip4_full_reass_main;
clib_error_t *error = 0;
u32 nbuckets;
vlib_node_t *node;
rm->vlib_main = vm;
vec_validate (rm->per_thread_data, vlib_num_workers ());
ip4_full_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);
}
node = vlib_get_node_by_name (vm, (u8 *) "ip4-full-reassembly-expire-walk");
ASSERT (node);
rm->ip4_full_reass_expire_node_idx = node->index;
ip4_full_reass_set_params (IP4_REASS_TIMEOUT_DEFAULT_MS,
IP4_REASS_MAX_REASSEMBLIES_DEFAULT,
IP4_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
IP4_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
nbuckets = ip4_full_reass_get_nbuckets ();
clib_bihash_init_16_8 (&rm->hash, "ip4-dr", nbuckets, nbuckets * 1024);
node = vlib_get_node_by_name (vm, (u8 *) "ip4-drop");
ASSERT (node);
rm->ip4_drop_idx = node->index;
rm->fq_index = vlib_frame_queue_main_init (ip4_full_reass_node.index, 0);
rm->fq_feature_index =
vlib_frame_queue_main_init (ip4_full_reass_node_feature.index, 0);
rm->fq_custom_index =
vlib_frame_queue_main_init (ip4_full_reass_node_custom.index, 0);
rm->feature_use_refcount_per_intf = NULL;
return error;
}
VLIB_INIT_FUNCTION (ip4_full_reass_init_function);
#endif /* CLIB_MARCH_VARIANT */
static uword
ip4_full_reass_walk_expired (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * f)
{
ip4_full_reass_main_t *rm = &ip4_full_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 IP4_EVENT_CONFIG_CHANGED:
break;
default:
clib_warning ("BUG: event type 0x%wx", event_type);
break;
}
f64 now = vlib_time_now (vm);
ip4_full_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)
{
ip4_full_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)
{
ip4_full_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
ip4_full_reass_drop_all (vm, node, rm, reass);
ip4_full_reass_free (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 (ip4_full_reass_expire_node) = {
.function = ip4_full_reass_walk_expired,
.type = VLIB_NODE_TYPE_PROCESS,
.name = "ip4-full-reassembly-expire-walk",
.format_trace = format_ip4_full_reass_trace,
.n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
.error_strings = ip4_full_reass_error_strings,
};
/* *INDENT-ON* */
static u8 *
format_ip4_full_reass_key (u8 * s, va_list * args)
{
ip4_full_reass_key_t *key = va_arg (*args, ip4_full_reass_key_t *);
s =
format (s,
"xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
key->xx_id, format_ip4_address, &key->src, format_ip4_address,
&key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
return s;
}
static u8 *
format_ip4_reass (u8 * s, va_list * args)
{
vlib_main_t *vm = va_arg (*args, vlib_main_t *);
ip4_full_reass_t *reass = va_arg (*args, ip4_full_reass_t *);
s = format (s, "ID: %lu, key: %U\n first_bi: %u, data_len: %u, "
"last_packet_octet: %u, trace_op_counter: %u\n",
reass->id, format_ip4_full_reass_key, &reass->key,
reass->first_bi, reass->data_len,
reass->last_packet_octet, reass->trace_op_counter);
u32 bi = reass->first_bi;
u32 counter = 0;
while (~0 != bi)
{
vlib_buffer_t *b = vlib_get_buffer (vm, bi);
vnet_buffer_opaque_t *vnb = vnet_buffer (b);
s =
format (s,
" #%03u: range: [%u, %u], bi: %u, off: %d, len: %u, "
"fragment[%u, %u]\n", counter, vnb->ip.reass.range_first,
vnb->ip.reass.range_last, bi,
ip4_full_reass_buffer_get_data_offset (b),
ip4_full_reass_buffer_get_data_len (b),
vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last);
if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
{
bi = b->next_buffer;
}
else
{
bi = ~0;
}
}
return s;
}
static clib_error_t *
show_ip4_reass (vlib_main_t * vm,
unformat_input_t * input,
CLIB_UNUSED (vlib_cli_command_t * lmd))
{
ip4_full_reass_main_t *rm = &ip4_full_reass_main;
vlib_cli_output (vm, "---------------------");
vlib_cli_output (vm, "IP4 reassembly status");
vlib_cli_output (vm, "---------------------");
bool details = false;
if (unformat (input, "details"))
{
details = true;
}
u32 sum_reass_n = 0;
ip4_full_reass_t *reass;
uword thread_index;
const uword nthreads = vlib_num_workers () + 1;
for (thread_index = 0; thread_index < nthreads; ++thread_index)
{
ip4_full_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_ip4_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 full IP4 reassemblies count: %lu\n",
(long unsigned) sum_reass_n);
vlib_cli_output (vm,
"Maximum configured concurrent full IP4 reassemblies per worker-thread: %lu\n",
(long unsigned) rm->max_reass_n);
vlib_cli_output (vm,
"Maximum configured amount of fragments "
"per full IP4 reassembly: %lu\n",
(long unsigned) rm->max_reass_len);
vlib_cli_output (vm,
"Maximum configured full IP4 reassembly timeout: %lums\n",
(long unsigned) rm->timeout_ms);
vlib_cli_output (vm,
"Maximum configured full IP4 reassembly expire walk interval: %lums\n",
(long unsigned) rm->expire_walk_interval_ms);
return 0;
}
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (show_ip4_full_reass_cmd, static) = {
.path = "show ip4-full-reassembly",
.short_help = "show ip4-full-reassembly [details]",
.function = show_ip4_reass,
};
/* *INDENT-ON* */
#ifndef CLIB_MARCH_VARIANT
vnet_api_error_t
ip4_full_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
{
return vnet_feature_enable_disable ("ip4-unicast",
"ip4-full-reassembly-feature",
sw_if_index, enable_disable, 0, 0);
}
#endif /* CLIB_MARCH_VARIANT */
#define foreach_ip4_full_reass_handoff_error \
_(CONGESTION_DROP, "congestion drop")
typedef enum
{
#define _(sym,str) IP4_FULL_REASS_HANDOFF_ERROR_##sym,
foreach_ip4_full_reass_handoff_error
#undef _
IP4_FULL_REASS_HANDOFF_N_ERROR,
} ip4_full_reass_handoff_error_t;
static char *ip4_full_reass_handoff_error_strings[] = {
#define _(sym,string) string,
foreach_ip4_full_reass_handoff_error
#undef _
};
typedef struct
{
u32 next_worker_index;
} ip4_full_reass_handoff_trace_t;
static u8 *
format_ip4_full_reass_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 *);
ip4_full_reass_handoff_trace_t *t =
va_arg (*args, ip4_full_reass_handoff_trace_t *);
s =
format (s, "ip4-full-reassembly-handoff: next-worker %d",
t->next_worker_index);
return s;
}
always_inline uword
ip4_full_reass_handoff_node_inline (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame,
ip4_full_reass_node_type_t type)
{
ip4_full_reass_main_t *rm = &ip4_full_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;
switch (type)
{
case NORMAL:
fq_index = rm->fq_index;
break;
case FEATURE:
fq_index = rm->fq_feature_index;
break;
case CUSTOM:
fq_index = rm->fq_custom_index;
break;
default:
clib_warning ("Unexpected `type' (%d)!", type);
ASSERT (0);
}
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)))
{
ip4_full_reass_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, node, fq_index, from,
thread_indices, frame->n_vectors, 1);
if (n_enq < frame->n_vectors)
vlib_node_increment_counter (vm, node->node_index,
IP4_FULL_REASS_HANDOFF_ERROR_CONGESTION_DROP,
frame->n_vectors - n_enq);
return frame->n_vectors;
}
VLIB_NODE_FN (ip4_full_reass_handoff_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
return ip4_full_reass_handoff_node_inline (vm, node, frame, NORMAL);
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip4_full_reass_handoff_node) = {
.name = "ip4-full-reassembly-handoff",
.vector_size = sizeof (u32),
.n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
.error_strings = ip4_full_reass_handoff_error_strings,
.format_trace = format_ip4_full_reass_handoff_trace,
.n_next_nodes = 1,
.next_nodes = {
[0] = "error-drop",
},
};
/* *INDENT-ON* */
/* *INDENT-OFF* */
VLIB_NODE_FN (ip4_full_reass_feature_handoff_node) (vlib_main_t * vm,
vlib_node_runtime_t *
node,
vlib_frame_t * frame)
{
return ip4_full_reass_handoff_node_inline (vm, node, frame, FEATURE);
}
/* *INDENT-ON* */
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip4_full_reass_feature_handoff_node) = {
.name = "ip4-full-reass-feature-hoff",
.vector_size = sizeof (u32),
.n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
.error_strings = ip4_full_reass_handoff_error_strings,
.format_trace = format_ip4_full_reass_handoff_trace,
.n_next_nodes = 1,
.next_nodes = {
[0] = "error-drop",
},
};
/* *INDENT-ON* */
/* *INDENT-OFF* */
VLIB_NODE_FN (ip4_full_reass_custom_handoff_node) (vlib_main_t * vm,
vlib_node_runtime_t *
node,
vlib_frame_t * frame)
{
return ip4_full_reass_handoff_node_inline (vm, node, frame, CUSTOM);
}
/* *INDENT-ON* */
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip4_full_reass_custom_handoff_node) = {
.name = "ip4-full-reass-custom-hoff",
.vector_size = sizeof (u32),
.n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
.error_strings = ip4_full_reass_handoff_error_strings,
.format_trace = format_ip4_full_reass_handoff_trace,
.n_next_nodes = 1,
.next_nodes = {
[0] = "error-drop",
},
};
/* *INDENT-ON* */
#ifndef CLIB_MARCH_VARIANT
int
ip4_full_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
{
ip4_full_reass_main_t *rm = &ip4_full_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 ("ip4-unicast",
"ip4-full-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 ("ip4-unicast",
"ip4-full-reassembly-feature",
sw_if_index, 0, 0, 0);
}
return -1;
}
#endif
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/