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gerrit.nordix.org / fdio / vpp / 522a5b33321ea198fe73f3180a692c316c63575f / . / src / vnet / ip / reass / ip6_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 IPv6 Full Reassembly.
*
* This file contains the source code for IPv6 full reassembly.
*/
#include <vppinfra/vec.h>
#include <vnet/vnet.h>
#include <vnet/ip/ip.h>
#include <vppinfra/bihash_48_8.h>
#include <vnet/ip/reass/ip6_full_reass.h>
#include <vnet/ip/ip6_inlines.h>
#define MSEC_PER_SEC 1000
#define IP6_FULL_REASS_TIMEOUT_DEFAULT_MS 200
/* As there are only 1024 reass context per thread, either the DDOS attacks
* or fractions of real timeouts, would consume these contexts quickly and
* running out context space and unable to perform reassembly */
#define IP6_FULL_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 50 // 50 ms default
#define IP6_FULL_REASS_MAX_REASSEMBLIES_DEFAULT 1024
#define IP6_FULL_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3
#define IP6_FULL_REASS_HT_LOAD_FACTOR (0.75)
typedef enum
{
IP6_FULL_REASS_RC_OK,
IP6_FULL_REASS_RC_INTERNAL_ERROR,
IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS,
IP6_FULL_REASS_RC_NO_BUF,
IP6_FULL_REASS_RC_HANDOFF,
IP6_FULL_REASS_RC_INVALID_FRAG_LEN,
IP6_FULL_REASS_RC_OVERLAP,
} ip6_full_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_full_reass_key_t;
typedef union
{
struct
{
u32 reass_index;
u32 memory_owner_thread_index;
};
u64 as_u64;
} ip6_full_reass_val_t;
typedef union
{
struct
{
ip6_full_reass_key_t k;
ip6_full_reass_val_t v;
};
clib_bihash_kv_48_8_t kv;
} ip6_full_reass_kv_t;
always_inline u32
ip6_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
ip6_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 +
ip6_full_reass_buffer_get_data_offset (b)) + 1;
}
typedef struct
{
// hash table key
ip6_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 custom apps (~0 if not set)
u32 next_index;
// error next index - used by custom apps (~0 if not set)
u32 error_next_index;
// minimum fragment length for this reassembly - used to estimate MTU
u16 min_fragment_length;
// number of fragments for 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;
} ip6_full_reass_t;
typedef struct
{
ip6_full_reass_t *pool;
u32 reass_n;
u32 id_counter;
// for pacing the main thread timeouts
u32 last_id;
clib_spinlock_t lock;
} ip6_full_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_full_reass_per_thread_t *per_thread_data;
// convenience
vlib_main_t *vlib_main;
u32 ip6_icmp_error_idx;
u32 ip6_full_reass_expire_node_idx;
/** Worker handoff */
u32 fq_index;
u32 fq_local_index;
u32 fq_feature_index;
u32 fq_custom_index;
// reference count for enabling/disabling feature - per interface
u32 *feature_use_refcount_per_intf;
// whether local fragmented packets are reassembled or not
int is_local_reass_enabled;
} ip6_full_reass_main_t;
extern ip6_full_reass_main_t ip6_full_reass_main;
#ifndef CLIB_MARCH_VARIANT
ip6_full_reass_main_t ip6_full_reass_main;
#endif /* CLIB_MARCH_VARIANT */
typedef enum
{
IP6_FULL_REASSEMBLY_NEXT_INPUT,
IP6_FULL_REASSEMBLY_NEXT_DROP,
IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR,
IP6_FULL_REASSEMBLY_NEXT_HANDOFF,
IP6_FULL_REASSEMBLY_N_NEXT,
} ip6_full_reass_next_t;
typedef enum
{
NORMAL,
FEATURE,
CUSTOM
} ip6_full_reass_node_type_t;
typedef enum
{
RANGE_NEW,
RANGE_DISCARD,
RANGE_OVERLAP,
ICMP_ERROR_RT_EXCEEDED,
ICMP_ERROR_FL_TOO_BIG,
ICMP_ERROR_FL_NOT_MULT_8,
FINALIZE,
HANDOFF,
PASSTHROUGH,
} ip6_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;
} ip6_full_reass_range_trace_t;
typedef struct
{
ip6_full_reass_trace_operation_e action;
u32 reass_id;
ip6_full_reass_range_trace_t trace_range;
u32 op_id;
u32 fragment_first;
u32 fragment_last;
u32 total_data_len;
u32 thread_id;
u32 thread_id_to;
bool is_after_handoff;
ip6_header_t ip6_header;
ip6_frag_hdr_t ip6_frag_header;
} ip6_full_reass_trace_t;
static void
ip6_full_reass_trace_details (vlib_main_t * vm, u32 bi,
ip6_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 = ip6_full_reass_buffer_get_data_offset (b);
trace->data_len = ip6_full_reass_buffer_get_data_len (b);
trace->range_bi = bi;
}
static u8 *
format_ip6_full_reass_range_trace (u8 * s, va_list * args)
{
ip6_full_reass_range_trace_t *trace =
va_arg (*args, ip6_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_ip6_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 *);
ip6_full_reass_trace_t *t = va_arg (*args, ip6_full_reass_trace_t *);
u32 indent = 0;
if (~0 != t->reass_id)
{
if (t->is_after_handoff)
{
s =
format (s, "%U\n", format_ip6_header, &t->ip6_header,
sizeof (t->ip6_header));
s =
format (s, " %U\n", format_ip6_frag_hdr, &t->ip6_frag_header,
sizeof (t->ip6_frag_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_NEW:
s = format (s, "\n%Unew %U", format_white_space, indent,
format_ip6_full_reass_range_trace, &t->trace_range);
break;
case RANGE_DISCARD:
s = format (s, "\n%Udiscard %U", format_white_space, indent,
format_ip6_full_reass_range_trace, &t->trace_range);
break;
case RANGE_OVERLAP:
s = format (s, "\n%Uoverlap %U", format_white_space, indent,
format_ip6_full_reass_range_trace, &t->trace_range);
break;
case ICMP_ERROR_FL_TOO_BIG:
s = format (s, "\n%Uicmp-error - frag_len > 65535 %U",
format_white_space, indent,
format_ip6_full_reass_range_trace, &t->trace_range);
break;
case ICMP_ERROR_FL_NOT_MULT_8:
s = format (s, "\n%Uicmp-error - frag_len mod 8 != 0 %U",
format_white_space, indent,
format_ip6_full_reass_range_trace, &t->trace_range);
break;
case ICMP_ERROR_RT_EXCEEDED:
s = format (s, "\n%Uicmp-error - reassembly time exceeded",
format_white_space, indent);
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;
case PASSTHROUGH:
s = format (s, "passthrough - not a fragment");
break;
}
return s;
}
static void
ip6_full_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
ip6_full_reass_t * reass, u32 bi,
ip6_frag_hdr_t * ip6_frag_header,
ip6_full_reass_trace_operation_e action,
u32 thread_id_to)
{
vlib_buffer_t *b = vlib_get_buffer (vm, bi);
vnet_buffer_opaque_t *vnb = vnet_buffer (b);
bool is_after_handoff = false;
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;
}
if (vlib_buffer_get_trace_thread (b) != vm->thread_index)
{
is_after_handoff = true;
}
ip6_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->ip6_header, vlib_buffer_get_current (b),
clib_min (sizeof (t->ip6_header), b->current_length));
if (ip6_frag_header)
{
clib_memcpy (&t->ip6_frag_header, ip6_frag_header,
sizeof (t->ip6_frag_header));
}
else
{
clib_memset (&t->ip6_frag_header, 0, sizeof (t->ip6_frag_header));
}
}
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->action = action;
t->thread_id = vm->thread_index;
t->thread_id_to = thread_id_to;
ip6_full_reass_trace_details (vm, bi, &t->trace_range);
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_ip6_full_reass_trace, NULL, NULL, t);
printf ("%.*s\n", vec_len (s), s);
fflush (stdout);
vec_reset_length (s);
#endif
}
always_inline void
ip6_full_reass_free_ctx (ip6_full_reass_per_thread_t * rt,
ip6_full_reass_t * reass)
{
pool_put (rt->pool, reass);
--rt->reass_n;
}
always_inline void
ip6_full_reass_free (ip6_full_reass_main_t * rm,
ip6_full_reass_per_thread_t * rt,
ip6_full_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);
ip6_full_reass_free_ctx (rt, reass);
}
/* n_left_to_next, and to_next are taken as input params, as this function
* could be called from a graphnode, where its managing local copy of these
* variables, and ignoring those and still trying to enqueue the buffers
* with local variables would cause either buffer leak or corruption */
always_inline void
ip6_full_reass_drop_all (vlib_main_t *vm, vlib_node_runtime_t *node,
ip6_full_reass_t *reass, u32 *n_left_to_next,
u32 **to_next)
{
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);
if (~0 != range_bi)
{
vec_add1 (to_free, range_bi);
}
range_bi = range_vnb->ip.reass.next_range_bi;
}
/* send to next_error_index */
if (~0 != reass->error_next_index &&
reass->error_next_index < node->n_next_nodes)
{
u32 next_index;
next_index = reass->error_next_index;
u32 bi = ~0;
/* record number of packets sent to custom app */
vlib_node_increment_counter (vm, node->node_index,
IP6_ERROR_REASS_TO_CUSTOM_APP,
vec_len (to_free));
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)
{
vlib_buffer_t *b = vlib_get_buffer (vm, bi);
if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
{
ip6_full_reass_add_trace (vm, node, reass, bi, NULL,
RANGE_DISCARD, ~0);
}
*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
sanitize_reass_buffers_add_missing (vlib_main_t *vm, ip6_full_reass_t *reass,
u32 *bi0)
{
u32 range_bi = reass->first_bi;
vlib_buffer_t *range_b;
vnet_buffer_opaque_t *range_vnb;
while (~0 != range_bi)
{
range_b = vlib_get_buffer (vm, range_bi);
range_vnb = vnet_buffer (range_b);
u32 bi = range_bi;
if (~0 != bi)
{
if (bi == *bi0)
*bi0 = ~0;
if (range_b->flags & VLIB_BUFFER_NEXT_PRESENT)
{
u32 _bi = bi;
vlib_buffer_t *_b = vlib_get_buffer (vm, _bi);
while (_b->flags & VLIB_BUFFER_NEXT_PRESENT)
{
if (_b->next_buffer != range_vnb->ip.reass.next_range_bi)
{
_bi = _b->next_buffer;
_b = vlib_get_buffer (vm, _bi);
}
else
{
_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
break;
}
}
}
range_bi = range_vnb->ip.reass.next_range_bi;
}
}
if (*bi0 != ~0)
{
vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
if (~0 != reass->first_bi)
{
fvnb->ip.reass.next_range_bi = reass->first_bi;
reass->first_bi = *bi0;
}
else
{
reass->first_bi = *bi0;
fvnb->ip.reass.next_range_bi = ~0;
}
*bi0 = ~0;
}
}
always_inline void
ip6_full_reass_on_timeout (vlib_main_t *vm, vlib_node_runtime_t *node,
ip6_full_reass_t *reass, u32 *icmp_bi,
u32 *n_left_to_next, u32 **to_next)
{
if (~0 == reass->first_bi)
{
return;
}
if (~0 == reass->next_index) // custom apps don't want icmp
{
vlib_buffer_t *b = vlib_get_buffer (vm, reass->first_bi);
if (0 == vnet_buffer (b)->ip.reass.fragment_first)
{
*icmp_bi = reass->first_bi;
if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
{
ip6_full_reass_add_trace (vm, node, reass, reass->first_bi, NULL,
ICMP_ERROR_RT_EXCEEDED, ~0);
}
// fragment with offset zero received - send icmp message back
if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
{
// separate first buffer from chain and steer it towards icmp node
b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
reass->first_bi = b->next_buffer;
}
else
{
reass->first_bi = vnet_buffer (b)->ip.reass.next_range_bi;
}
icmp6_error_set_vnet_buffer (b, ICMP6_time_exceeded,
ICMP6_time_exceeded_fragment_reassembly_time_exceeded,
0);
}
}
ip6_full_reass_drop_all (vm, node, reass, n_left_to_next, to_next);
}
always_inline ip6_full_reass_t *
ip6_full_reass_find_or_create (vlib_main_t *vm, vlib_node_runtime_t *node,
ip6_full_reass_main_t *rm,
ip6_full_reass_per_thread_t *rt,
ip6_full_reass_kv_t *kv, u32 *icmp_bi,
u8 *do_handoff, int skip_bihash,
u32 *n_left_to_next, u32 **to_next)
{
ip6_full_reass_t *reass;
f64 now;
again:
reass = NULL;
now = vlib_time_now (vm);
if (!skip_bihash && !clib_bihash_search_48_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)
{
vlib_node_increment_counter (vm, node->node_index,
IP6_ERROR_REASS_TIMEOUT, 1);
ip6_full_reass_on_timeout (vm, node, reass, icmp_bi, n_left_to_next,
to_next);
ip6_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;
++rt->id_counter;
reass->first_bi = ~0;
reass->last_packet_octet = ~0;
reass->data_len = 0;
reass->next_index = ~0;
reass->error_next_index = ~0;
reass->memory_owner_thread_index = vm->thread_index;
++rt->reass_n;
}
kv->v.reass_index = (reass - rt->pool);
kv->v.memory_owner_thread_index = vm->thread_index;
reass->last_heard = now;
if (!skip_bihash)
{
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];
int rv = clib_bihash_add_del_48_8 (&rm->hash, &kv->kv, 2);
if (rv)
{
ip6_full_reass_free (rm, rt, reass);
reass = NULL;
// if other worker created a context already work with the other copy
if (-2 == rv)
goto again;
}
}
else
{
reass->key.as_u64[0] = ~0;
reass->key.as_u64[1] = ~0;
reass->key.as_u64[2] = ~0;
reass->key.as_u64[3] = ~0;
reass->key.as_u64[4] = ~0;
reass->key.as_u64[5] = ~0;
}
return reass;
}
always_inline ip6_full_reass_rc_t
ip6_full_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node,
ip6_full_reass_main_t * rm,
ip6_full_reass_per_thread_t * rt,
ip6_full_reass_t * reass, u32 * bi0, u32 * next0,
u32 * error0, bool is_custom_app)
{
*bi0 = reass->first_bi;
*error0 = IP6_ERROR_NONE;
ip6_frag_hdr_t *frag_hdr;
vlib_buffer_t *last_b = NULL;
u32 sub_chain_bi = reass->first_bi;
u32 total_length = 0;
u32 buf_cnt = 0;
u32 dropped_cnt = 0;
u32 *vec_drop_compress = NULL;
ip6_full_reass_rc_t rv = IP6_FULL_REASS_RC_OK;
do
{
u32 tmp_bi = sub_chain_bi;
vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi);
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))
{
rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
goto free_buffers_and_return;
}
u32 data_len = ip6_full_reass_buffer_get_data_len (tmp);
u32 trim_front = vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset +
sizeof (*frag_hdr) + ip6_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 ip6 header */
if (0 != ip6_full_reass_buffer_get_data_offset (tmp))
{
rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
goto free_buffers_and_return;
}
trim_front = 0;
trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len -
(vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset +
sizeof (*frag_hdr));
if (!(vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0))
{
rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
goto free_buffers_and_return;
}
}
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 */
if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
{
rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
goto free_buffers_and_return;
}
trim_front -= tmp->current_length;
vec_add1 (vec_drop_compress, tmp_bi);
tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
tmp_bi = tmp->next_buffer;
tmp = vlib_get_buffer (vm, tmp_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))
{
rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
goto free_buffers_and_return;
}
}
total_length += tmp->current_length;
}
else
{
if (reass->first_bi == tmp_bi)
{
rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
goto free_buffers_and_return;
}
vec_add1 (vec_drop_compress, tmp_bi);
++dropped_cnt;
}
if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT)
{
tmp_bi = tmp->next_buffer;
tmp = vlib_get_buffer (vm, tmp->next_buffer);
}
else
{
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)
{
rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
goto free_buffers_and_return;
}
last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi);
if (total_length < first_b->current_length)
{
rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
goto free_buffers_and_return;
}
total_length -= first_b->current_length;
first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
first_b->total_length_not_including_first_buffer = total_length;
// drop fragment header
vnet_buffer_opaque_t *first_b_vnb = vnet_buffer (first_b);
ip6_header_t *ip = vlib_buffer_get_current (first_b);
u16 ip6_frag_hdr_offset = first_b_vnb->ip.reass.ip6_frag_hdr_offset;
ip6_ext_hdr_chain_t hdr_chain;
ip6_ext_header_t *prev_hdr = 0;
int res = ip6_ext_header_walk (first_b, ip, IP_PROTOCOL_IPV6_FRAGMENTATION,
&hdr_chain);
if (res < 0 ||
(hdr_chain.eh[res].protocol != IP_PROTOCOL_IPV6_FRAGMENTATION))
{
rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
goto free_buffers_and_return;
}
frag_hdr = ip6_ext_next_header_offset (ip, hdr_chain.eh[res].offset);
if (res > 0)
{
prev_hdr = ip6_ext_next_header_offset (ip, hdr_chain.eh[res - 1].offset);
prev_hdr->next_hdr = frag_hdr->next_hdr;
}
else
{
ip->protocol = frag_hdr->next_hdr;
}
if (hdr_chain.eh[res].offset != ip6_frag_hdr_offset)
{
rv = IP6_FULL_REASS_RC_INTERNAL_ERROR;
goto free_buffers_and_return;
}
memmove (frag_hdr, (u8 *) frag_hdr + sizeof (*frag_hdr),
first_b->current_length - ip6_frag_hdr_offset -
sizeof (ip6_frag_hdr_t));
first_b->current_length -= sizeof (*frag_hdr);
ip->payload_length =
clib_host_to_net_u16 (total_length + first_b->current_length -
sizeof (*ip));
if (!vlib_buffer_chain_linearize (vm, first_b))
{
rv = IP6_FULL_REASS_RC_NO_BUF;
goto free_buffers_and_return;
}
first_b->flags &= ~VLIB_BUFFER_EXT_HDR_VALID;
if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED))
{
ip6_full_reass_add_trace (vm, node, reass, reass->first_bi, NULL,
FINALIZE, ~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
}
if (!is_custom_app)
{
*next0 = IP6_FULL_REASSEMBLY_NEXT_INPUT;
}
else
{
*next0 = reass->next_index;
}
vnet_buffer (first_b)->ip.reass.estimated_mtu = reass->min_fragment_length;
/* Keep track of number of successfully reassembled packets and number of
* fragments reassembled */
vlib_node_increment_counter (vm, node->node_index, IP6_ERROR_REASS_SUCCESS,
1);
vlib_node_increment_counter (vm, node->node_index,
IP6_ERROR_REASS_FRAGMENTS_REASSEMBLED,
reass->fragments_n);
ip6_full_reass_free (rm, rt, reass);
reass = NULL;
free_buffers_and_return:
vlib_buffer_free (vm, vec_drop_compress, vec_len (vec_drop_compress));
vec_free (vec_drop_compress);
return rv;
}
always_inline void
ip6_full_reass_insert_range_in_chain (vlib_main_t * vm,
ip6_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;
}
reass->data_len += ip6_full_reass_buffer_get_data_len (new_next_b);
}
always_inline ip6_full_reass_rc_t
ip6_full_reass_update (vlib_main_t *vm, vlib_node_runtime_t *node,
ip6_full_reass_main_t *rm,
ip6_full_reass_per_thread_t *rt,
ip6_full_reass_t *reass, u32 *bi0, u32 *next0,
u32 *error0, ip6_frag_hdr_t *frag_hdr,
bool is_custom_app, u32 *handoff_thread_idx,
int skip_bihash)
{
int consumed = 0;
vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
if (is_custom_app)
{
reass->next_index = fvnb->ip.reass.next_index; // store next_index before it's overwritten
reass->error_next_index = fvnb->ip.reass.error_next_index; // store error_next_index before it is overwritten
}
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_FULL_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));
if (0 == fragment_length)
{
return IP6_FULL_REASS_RC_INVALID_FRAG_LEN;
}
u32 fragment_last = fvnb->ip.reass.fragment_last =
fragment_first + fragment_length - 1;
int more_fragments = ip6_frag_hdr_more (frag_hdr);
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
ip6_full_reass_insert_range_in_chain (vm, reass, prev_range_bi, *bi0);
reass->min_fragment_length = clib_net_to_host_u16 (fip->payload_length);
consumed = 1;
reass->fragments_n = 1;
goto check_if_done_maybe;
}
reass->min_fragment_length =
clib_min (clib_net_to_host_u16 (fip->payload_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
ip6_full_reass_insert_range_in_chain (vm, reass, prev_range_bi,
*bi0);
consumed = 1;
break;
}
continue;
}
if (fragment_last < candidate_vnb->ip.reass.range_first)
{
// this fragment ends before candidate range without any overlap
ip6_full_reass_insert_range_in_chain (vm, reass, prev_range_bi,
*bi0);
consumed = 1;
}
else if (fragment_first == candidate_vnb->ip.reass.range_first &&
fragment_last == candidate_vnb->ip.reass.range_last)
{
// duplicate fragment - ignore
}
else
{
// overlapping fragment - not allowed by RFC 8200
if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
{
ip6_full_reass_add_trace (vm, node, reass, *bi0, frag_hdr,
RANGE_OVERLAP, ~0);
}
return IP6_FULL_REASS_RC_OVERLAP;
}
break;
}
++reass->fragments_n;
check_if_done_maybe:
if (consumed)
{
if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
{
ip6_full_reass_add_trace (vm, node, reass, *bi0, frag_hdr, RANGE_NEW,
~0);
}
}
else if (skip_bihash)
{
// if this reassembly is not in bihash, then the packet must have been
// consumed
return IP6_FULL_REASS_RC_INTERNAL_ERROR;
}
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;
ip6_full_reass_rc_t rc =
ip6_full_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0,
is_custom_app);
if (IP6_FULL_REASS_RC_OK == rc && handoff)
{
return IP6_FULL_REASS_RC_HANDOFF;
}
return rc;
}
else
{
if (skip_bihash)
{
// if this reassembly is not in bihash, it should've been an atomic
// fragment and thus finalized
return IP6_FULL_REASS_RC_INTERNAL_ERROR;
}
if (consumed)
{
*bi0 = ~0;
if (reass->fragments_n > rm->max_reass_len)
{
return IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS;
}
}
else
{
*next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
*error0 = IP6_ERROR_REASS_DUPLICATE_FRAGMENT;
}
}
return IP6_FULL_REASS_RC_OK;
}
always_inline bool
ip6_full_reass_verify_upper_layer_present (vlib_node_runtime_t *node,
vlib_buffer_t *b,
ip6_ext_hdr_chain_t *hc)
{
int nh = hc->eh[hc->length - 1].protocol;
/* Checking to see if it's a terminating header */
if (ip6_ext_hdr (nh))
{
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_full_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);
b->error = node->errors[IP6_ERROR_REASS_INVALID_FRAG_SIZE];
return false;
}
return true;
}
always_inline bool
ip6_full_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);
b->error = node->errors[IP6_ERROR_REASS_INVALID_FRAG_SIZE];
return false;
}
return true;
}
always_inline uword
ip6_full_reassembly_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
vlib_frame_t *frame, bool is_feature,
bool is_custom_app, bool is_local)
{
u32 *from = vlib_frame_vector_args (frame);
u32 n_left_from, n_left_to_next, *to_next, next_index;
ip6_full_reass_main_t *rm = &ip6_full_reass_main;
ip6_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 = IP6_FULL_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_hdr_chain_t hdr_chain;
vnet_buffer_opaque_t *fvnb = vnet_buffer (b0);
int res = ip6_ext_header_walk (
b0, ip0, IP_PROTOCOL_IPV6_FRAGMENTATION, &hdr_chain);
if (res < 0 ||
hdr_chain.eh[res].protocol != IP_PROTOCOL_IPV6_FRAGMENTATION)
{
vlib_node_increment_counter (vm, node->node_index,
IP6_ERROR_REASS_NO_FRAG_HDR, 1);
// this is a mangled packet - no fragmentation
next0 = is_custom_app ? fvnb->ip.reass.error_next_index :
IP6_FULL_REASSEMBLY_NEXT_DROP;
ip6_full_reass_add_trace (vm, node, NULL, bi0, NULL, PASSTHROUGH,
~0);
goto skip_reass;
}
if (is_local && !rm->is_local_reass_enabled)
{
next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
goto skip_reass;
}
/* Keep track of received fragments */
vlib_node_increment_counter (vm, node->node_index,
IP6_ERROR_REASS_FRAGMENTS_RCVD, 1);
frag_hdr =
ip6_ext_next_header_offset (ip0, hdr_chain.eh[res].offset);
vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
hdr_chain.eh[res].offset;
if (0 == ip6_frag_hdr_offset (frag_hdr))
{
// first fragment - verify upper-layer is present
if (!ip6_full_reass_verify_upper_layer_present (node, b0,
&hdr_chain))
{
next0 = is_custom_app ? fvnb->ip.reass.error_next_index :
IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR;
goto skip_reass;
}
}
if (!ip6_full_reass_verify_fragment_multiple_8 (vm, node, b0,
frag_hdr) ||
!ip6_full_reass_verify_packet_size_lt_64k (vm, node, b0,
frag_hdr))
{
next0 = is_custom_app ? fvnb->ip.reass.error_next_index :
IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR;
goto skip_reass;
}
int skip_bihash = 0;
ip6_full_reass_kv_t kv;
u8 do_handoff = 0;
if (0 == ip6_frag_hdr_offset (frag_hdr) &&
!ip6_frag_hdr_more (frag_hdr))
{
// this is atomic fragment and needs to be processed separately
skip_bihash = 1;
}
else
{
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;
/* RFC 8200: The Next Header values in the Fragment headers of
* different fragments of the same original packet may differ.
* Only the value from the Offset zero fragment packet is used
* for reassembly.
*
* Also, IPv6 Header doesnt contain the protocol value unlike
* IPv4.*/
kv.k.as_u64[5] = 0;
}
ip6_full_reass_t *reass = ip6_full_reass_find_or_create (
vm, node, rm, rt, &kv, &icmp_bi, &do_handoff, skip_bihash,
&n_left_to_next, &to_next);
if (reass)
{
const u32 fragment_first = ip6_frag_hdr_offset (frag_hdr);
if (0 == fragment_first)
{
reass->sendout_thread_index = vm->thread_index;
}
}
if (PREDICT_FALSE (do_handoff))
{
next0 = IP6_FULL_REASSEMBLY_NEXT_HANDOFF;
vnet_buffer (b0)->ip.reass.owner_thread_index =
kv.v.memory_owner_thread_index;
}
else if (reass)
{
u32 handoff_thread_idx;
u32 counter = ~0;
switch (ip6_full_reass_update (
vm, node, rm, rt, reass, &bi0, &next0, &error0, frag_hdr,
is_custom_app, &handoff_thread_idx, skip_bihash))
{
case IP6_FULL_REASS_RC_OK:
/* nothing to do here */
break;
case IP6_FULL_REASS_RC_HANDOFF:
next0 = IP6_FULL_REASSEMBLY_NEXT_HANDOFF;
b0 = vlib_get_buffer (vm, bi0);
vnet_buffer (b0)->ip.reass.owner_thread_index =
handoff_thread_idx;
break;
case IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS:
counter = IP6_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG;
break;
case IP6_FULL_REASS_RC_NO_BUF:
counter = IP6_ERROR_REASS_NO_BUF;
break;
case IP6_FULL_REASS_RC_INVALID_FRAG_LEN:
counter = IP6_ERROR_REASS_INVALID_FRAG_LEN;
break;
case IP6_FULL_REASS_RC_OVERLAP:
counter = IP6_ERROR_REASS_OVERLAPPING_FRAGMENT;
break;
case IP6_FULL_REASS_RC_INTERNAL_ERROR:
counter = IP6_ERROR_REASS_INTERNAL_ERROR;
/* Sanitization is needed in internal error cases only, as
* the incoming packet is already dropped in other cases,
* also adding bi0 back to the reassembly list, fixes the
* leaking of buffers during internal errors.
*
* Also it doesnt make sense to send these buffers custom
* app, these fragments are with internal errors */
sanitize_reass_buffers_add_missing (vm, reass, &bi0);
reass->error_next_index = ~0;
break;
}
if (~0 != counter)
{
vlib_node_increment_counter (vm, node->node_index, counter,
1);
ip6_full_reass_drop_all (vm, node, reass, &n_left_to_next,
&to_next);
ip6_full_reass_free (rm, rt, reass);
goto next_packet;
break;
}
}
else
{
if (is_feature)
{
next0 = IP6_FULL_REASSEMBLY_NEXT_DROP;
}
else
{
next0 = fvnb->ip.reass.error_next_index;
}
error0 = IP6_ERROR_REASS_LIMIT_REACHED;
}
if (~0 != bi0)
{
skip_reass:
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 (IP6_ERROR_NONE != error0)
{
b0->error = node->errors[error0];
}
if (next0 == IP6_FULL_REASSEMBLY_NEXT_HANDOFF)
{
if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
{
ip6_full_reass_add_trace (
vm, node, NULL, bi0, frag_hdr, HANDOFF,
vnet_buffer (b0)->ip.reass.owner_thread_index);
}
}
else if (is_feature && IP6_ERROR_NONE == error0)
{
vnet_feature_next (&next0, b0);
}
/* Increment the counter to-custom-app also as this fragment is
* also going to application */
if (is_custom_app)
{
vlib_node_increment_counter (
vm, node->node_index, IP6_ERROR_REASS_TO_CUSTOM_APP, 1);
}
vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
n_left_to_next, bi0, next0);
}
if (~0 != icmp_bi)
{
next0 = IP6_FULL_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;
}
VLIB_NODE_FN (ip6_full_reass_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
return ip6_full_reassembly_inline (vm, node, frame, false /* is_feature */,
false /* is_custom_app */,
false /* is_local */);
}
VLIB_REGISTER_NODE (ip6_full_reass_node) = {
.name = "ip6-full-reassembly",
.vector_size = sizeof (u32),
.format_trace = format_ip6_full_reass_trace,
.n_errors = IP6_N_ERROR,
.error_counters = ip6_error_counters,
.n_next_nodes = IP6_FULL_REASSEMBLY_N_NEXT,
.next_nodes =
{
[IP6_FULL_REASSEMBLY_NEXT_INPUT] = "ip6-input",
[IP6_FULL_REASSEMBLY_NEXT_DROP] = "ip6-drop",
[IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
[IP6_FULL_REASSEMBLY_NEXT_HANDOFF] = "ip6-full-reassembly-handoff",
},
};
VLIB_NODE_FN (ip6_local_full_reass_node)
(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
{
return ip6_full_reassembly_inline (vm, node, frame, false /* is_feature */,
false /* is_custom_app */,
true /* is_local */);
}
VLIB_REGISTER_NODE (ip6_local_full_reass_node) = {
.name = "ip6-local-full-reassembly",
.vector_size = sizeof (u32),
.format_trace = format_ip6_full_reass_trace,
.n_errors = IP6_N_ERROR,
.error_counters = ip6_error_counters,
.n_next_nodes = IP6_FULL_REASSEMBLY_N_NEXT,
.next_nodes =
{
[IP6_FULL_REASSEMBLY_NEXT_INPUT] = "ip6-input",
[IP6_FULL_REASSEMBLY_NEXT_DROP] = "ip6-drop",
[IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
[IP6_FULL_REASSEMBLY_NEXT_HANDOFF] = "ip6-local-full-reassembly-handoff",
},
};
VLIB_NODE_FN (ip6_full_reass_node_feature) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
return ip6_full_reassembly_inline (vm, node, frame, true /* is_feature */,
false /* is_custom_app */,
false /* is_local */);
}
VLIB_REGISTER_NODE (ip6_full_reass_node_feature) = {
.name = "ip6-full-reassembly-feature",
.vector_size = sizeof (u32),
.format_trace = format_ip6_full_reass_trace,
.n_errors = IP6_N_ERROR,
.error_counters = ip6_error_counters,
.n_next_nodes = IP6_FULL_REASSEMBLY_N_NEXT,
.next_nodes =
{
[IP6_FULL_REASSEMBLY_NEXT_INPUT] = "ip6-input",
[IP6_FULL_REASSEMBLY_NEXT_DROP] = "ip6-drop",
[IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
[IP6_FULL_REASSEMBLY_NEXT_HANDOFF] = "ip6-full-reass-feature-hoff",
},
};
VNET_FEATURE_INIT (ip6_full_reassembly_feature, static) = {
.arc_name = "ip6-unicast",
.node_name = "ip6-full-reassembly-feature",
.runs_before = VNET_FEATURES ("ip6-lookup",
"ipsec6-input-feature"),
.runs_after = 0,
};
VLIB_NODE_FN (ip6_full_reass_node_custom)
(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
{
return ip6_full_reassembly_inline (vm, node, frame, false /* is_feature */,
true /* is_custom_app */,
false /* is_local */);
}
VLIB_REGISTER_NODE (ip6_full_reass_node_custom) = {
.name = "ip6-full-reassembly-custom",
.vector_size = sizeof (u32),
.format_trace = format_ip6_full_reass_trace,
.n_errors = IP6_N_ERROR,
.error_counters = ip6_error_counters,
.n_next_nodes = IP6_FULL_REASSEMBLY_N_NEXT,
.next_nodes =
{
[IP6_FULL_REASSEMBLY_NEXT_INPUT] = "ip6-input",
[IP6_FULL_REASSEMBLY_NEXT_DROP] = "ip6-drop",
[IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
[IP6_FULL_REASSEMBLY_NEXT_HANDOFF] = "ip6-full-reass-custom-hoff",
},
};
#ifndef CLIB_MARCH_VARIANT
static u32
ip6_full_reass_get_nbuckets ()
{
ip6_full_reass_main_t *rm = &ip6_full_reass_main;
u32 nbuckets;
u8 i;
/* need more mem with more workers */
nbuckets = (u32) (rm->max_reass_n * (vlib_num_workers () + 1) /
IP6_FULL_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_full_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_full_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
u32 max_reassembly_length,
u32 expire_walk_interval_ms)
{
ip6_full_reass_main.timeout_ms = timeout_ms;
ip6_full_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
ip6_full_reass_main.max_reass_n = max_reassemblies;
ip6_full_reass_main.max_reass_len = max_reassembly_length;
ip6_full_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
}
vnet_api_error_t
ip6_full_reass_set (u32 timeout_ms, u32 max_reassemblies,
u32 max_reassembly_length, u32 expire_walk_interval_ms)
{
u32 old_nbuckets = ip6_full_reass_get_nbuckets ();
ip6_full_reass_set_params (timeout_ms, max_reassemblies,
max_reassembly_length, expire_walk_interval_ms);
vlib_process_signal_event (ip6_full_reass_main.vlib_main,
ip6_full_reass_main.ip6_full_reass_expire_node_idx,
IP6_EVENT_CONFIG_CHANGED, 0);
u32 new_nbuckets = ip6_full_reass_get_nbuckets ();
if (ip6_full_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-full-reass", new_nbuckets,
new_nbuckets * 1024);
clib_bihash_foreach_key_value_pair_48_8 (&ip6_full_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_full_reass_main.hash);
clib_memcpy_fast (&ip6_full_reass_main.hash, &new_hash,
sizeof (ip6_full_reass_main.hash));
clib_bihash_copied (&ip6_full_reass_main.hash, &new_hash);
}
}
return 0;
}
vnet_api_error_t
ip6_full_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
u32 * max_reassembly_length,
u32 * expire_walk_interval_ms)
{
*timeout_ms = ip6_full_reass_main.timeout_ms;
*max_reassemblies = ip6_full_reass_main.max_reass_n;
*max_reassembly_length = ip6_full_reass_main.max_reass_len;
*expire_walk_interval_ms = ip6_full_reass_main.expire_walk_interval_ms;
return 0;
}
static clib_error_t *
ip6_full_reass_init_function (vlib_main_t * vm)
{
ip6_full_reass_main_t *rm = &ip6_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 ());
ip6_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 *) "ip6-full-reassembly-expire-walk");
ASSERT (node);
rm->ip6_full_reass_expire_node_idx = node->index;
ip6_full_reass_set_params (IP6_FULL_REASS_TIMEOUT_DEFAULT_MS,
IP6_FULL_REASS_MAX_REASSEMBLIES_DEFAULT,
IP6_FULL_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
IP6_FULL_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
nbuckets = ip6_full_reass_get_nbuckets ();
clib_bihash_init_48_8 (&rm->hash, "ip6-full-reass", nbuckets,
nbuckets * 1024);
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_local_full_reass_node.index);
rm->is_local_reass_enabled = 1;
rm->fq_index = vlib_frame_queue_main_init (ip6_full_reass_node.index, 0);
rm->fq_local_index =
vlib_frame_queue_main_init (ip6_local_full_reass_node.index, 0);
rm->fq_feature_index =
vlib_frame_queue_main_init (ip6_full_reass_node_feature.index, 0);
rm->fq_custom_index =
vlib_frame_queue_main_init (ip6_full_reass_node_custom.index, 0);
rm->feature_use_refcount_per_intf = NULL;
return error;
}
VLIB_INIT_FUNCTION (ip6_full_reass_init_function);
#endif /* CLIB_MARCH_VARIANT */
static uword
ip6_full_reass_walk_expired (vlib_main_t *vm, vlib_node_runtime_t *node,
CLIB_UNUSED (vlib_frame_t *f))
{
ip6_full_reass_main_t *rm = &ip6_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 */
/* fallthrough */
case IP6_EVENT_CONFIG_CHANGED:
/* nothing to do here */
break;
default:
clib_warning ("BUG: event type 0x%wx", event_type);
break;
}
f64 now = vlib_time_now (vm);
ip6_full_reass_t *reass;
int *pool_indexes_to_free = NULL;
uword thread_index = 0;
int index;
const uword nthreads = vlib_num_workers () + 1;
u32 *vec_icmp_bi = NULL;
u32 n_left_to_next, *to_next;
for (thread_index = 0; thread_index < nthreads; ++thread_index)
{
ip6_full_reass_per_thread_t *rt =
&rm->per_thread_data[thread_index];
u32 reass_timeout_cnt = 0;
clib_spinlock_lock (&rt->lock);
vec_reset_length (pool_indexes_to_free);
/* Pace the number of timeouts handled per thread,to avoid barrier
* sync issues in real world scenarios */
u32 beg = rt->last_id;
/* to ensure we walk at least once per sec per context */
u32 end = beg + (IP6_FULL_REASS_MAX_REASSEMBLIES_DEFAULT *
IP6_FULL_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS /
MSEC_PER_SEC +
1);
if (end > vec_len (rt->pool))
{
end = vec_len (rt->pool);
rt->last_id = 0;
}
else
{
rt->last_id = end;
}
pool_foreach_stepping_index (index, beg, end, rt->pool)
{
reass = pool_elt_at_index (rt->pool, index);
if (now > reass->last_heard + rm->timeout)
{
vec_add1 (pool_indexes_to_free, index);
}
}
int *i;
vec_foreach (i, pool_indexes_to_free)
{
ip6_full_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
u32 icmp_bi = ~0;
reass_timeout_cnt += reass->fragments_n;
ip6_full_reass_on_timeout (vm, node, reass, &icmp_bi,
&n_left_to_next, &to_next);
if (~0 != icmp_bi)
vec_add1 (vec_icmp_bi, icmp_bi);
ip6_full_reass_free (rm, rt, reass);
}
clib_spinlock_unlock (&rt->lock);
if (reass_timeout_cnt)
vlib_node_increment_counter (vm, node->node_index,
IP6_ERROR_REASS_TIMEOUT,
reass_timeout_cnt);
}
while (vec_len (vec_icmp_bi) > 0)
{
vlib_frame_t *f =
vlib_get_frame_to_node (vm, rm->ip6_icmp_error_idx);
u32 *to_next = vlib_frame_vector_args (f);
u32 n_left_to_next = VLIB_FRAME_SIZE - f->n_vectors;
int trace_frame = 0;
while (vec_len (vec_icmp_bi) > 0 && n_left_to_next > 0)
{
u32 bi = vec_pop (vec_icmp_bi);
vlib_buffer_t *b = vlib_get_buffer (vm, bi);
if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
trace_frame = 1;
to_next[0] = bi;
++f->n_vectors;
to_next += 1;
n_left_to_next -= 1;
}
f->frame_flags |= (trace_frame * VLIB_FRAME_TRACE);
vlib_put_frame_to_node (vm, rm->ip6_icmp_error_idx, f);
}
vec_free (pool_indexes_to_free);
vec_free (vec_icmp_bi);
if (event_data)
{
vec_set_len (event_data, 0);
}
}
return 0;
}
VLIB_REGISTER_NODE (ip6_full_reass_expire_node) = {
.function = ip6_full_reass_walk_expired,
.format_trace = format_ip6_full_reass_trace,
.type = VLIB_NODE_TYPE_PROCESS,
.name = "ip6-full-reassembly-expire-walk",
.n_errors = IP6_N_ERROR,
.error_counters = ip6_error_counters,
};
static u8 *
format_ip6_full_reass_key (u8 * s, va_list * args)
{
ip6_full_reass_key_t *key = va_arg (*args, ip6_full_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_full_reass (u8 * s, va_list * args)
{
vlib_main_t *vm = va_arg (*args, vlib_main_t *);
ip6_full_reass_t *reass = va_arg (*args, ip6_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_ip6_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,
ip6_full_reass_buffer_get_data_offset (b),
ip6_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_ip6_full_reass (vlib_main_t * vm, unformat_input_t * input,
CLIB_UNUSED (vlib_cli_command_t * lmd))
{
ip6_full_reass_main_t *rm = &ip6_full_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_full_reass_t *reass;
uword thread_index;
const uword nthreads = vlib_num_workers () + 1;
for (thread_index = 0; thread_index < nthreads; ++thread_index)
{
ip6_full_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
clib_spinlock_lock (&rt->lock);
if (details)
{
pool_foreach (reass, rt->pool) {
vlib_cli_output (vm, "%U", format_ip6_full_reass, vm, reass);
}
}
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 full IP6 reassemblies per worker-thread: %lu\n",
(long unsigned) rm->max_reass_n);
vlib_cli_output (vm,
"Maximum configured amount of fragments "
"per full IP6 reassembly: %lu\n",
(long unsigned) rm->max_reass_len);
vlib_cli_output (vm,
"Maximum configured full IP6 reassembly timeout: %lums\n",
(long unsigned) rm->timeout_ms);
vlib_cli_output (vm,
"Maximum configured full 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;
}
VLIB_CLI_COMMAND (show_ip6_full_reassembly_cmd, static) = {
.path = "show ip6-full-reassembly",
.short_help = "show ip6-full-reassembly [details]",
.function = show_ip6_full_reass,
};
#ifndef CLIB_MARCH_VARIANT
vnet_api_error_t
ip6_full_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
{
return vnet_feature_enable_disable ("ip6-unicast",
"ip6-full-reassembly-feature",
sw_if_index, enable_disable, 0, 0);
}
#endif /* CLIB_MARCH_VARIANT */
#define foreach_ip6_full_reassembly_handoff_error \
_(CONGESTION_DROP, "congestion drop")
typedef enum
{
#define _(sym,str) IP6_FULL_REASSEMBLY_HANDOFF_ERROR_##sym,
foreach_ip6_full_reassembly_handoff_error
#undef _
IP6_FULL_REASSEMBLY_HANDOFF_N_ERROR,
} ip6_full_reassembly_handoff_error_t;
static char *ip6_full_reassembly_handoff_error_strings[] = {
#define _(sym,string) string,
foreach_ip6_full_reassembly_handoff_error
#undef _
};
typedef struct
{
u32 next_worker_index;
} ip6_full_reassembly_handoff_trace_t;
static u8 *
format_ip6_full_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_full_reassembly_handoff_trace_t *t =
va_arg (*args, ip6_full_reassembly_handoff_trace_t *);
s =
format (s, "ip6-full-reassembly-handoff: next-worker %d",
t->next_worker_index);
return s;
}
always_inline uword
ip6_full_reassembly_handoff_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
vlib_frame_t *frame,
ip6_full_reass_node_type_t type,
bool is_local)
{
ip6_full_reass_main_t *rm = &ip6_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:
if (is_local)
{
fq_index = rm->fq_local_index;
}
else
{
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)))
{
ip6_full_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, node, fq_index, from,
thread_indices, frame->n_vectors, 1);
if (n_enq < frame->n_vectors)
vlib_node_increment_counter (vm, node->node_index,
IP6_FULL_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
frame->n_vectors - n_enq);
return frame->n_vectors;
}
VLIB_NODE_FN (ip6_full_reassembly_handoff_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
return ip6_full_reassembly_handoff_inline (vm, node, frame, NORMAL,
false /* is_local */);
}
VLIB_REGISTER_NODE (ip6_full_reassembly_handoff_node) = {
.name = "ip6-full-reassembly-handoff",
.vector_size = sizeof (u32),
.n_errors = ARRAY_LEN(ip6_full_reassembly_handoff_error_strings),
.error_strings = ip6_full_reassembly_handoff_error_strings,
.format_trace = format_ip6_full_reassembly_handoff_trace,
.n_next_nodes = 1,
.next_nodes = {
[0] = "error-drop",
},
};
VLIB_NODE_FN (ip6_local_full_reassembly_handoff_node)
(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
{
return ip6_full_reassembly_handoff_inline (vm, node, frame, NORMAL,
true /* is_feature */);
}
VLIB_REGISTER_NODE (ip6_local_full_reassembly_handoff_node) = {
.name = "ip6-local-full-reassembly-handoff",
.vector_size = sizeof (u32),
.n_errors = ARRAY_LEN(ip6_full_reassembly_handoff_error_strings),
.error_strings = ip6_full_reassembly_handoff_error_strings,
.format_trace = format_ip6_full_reassembly_handoff_trace,
.n_next_nodes = 1,
.next_nodes = {
[0] = "error-drop",
},
};
VLIB_NODE_FN (ip6_full_reassembly_feature_handoff_node) (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * frame)
{
return ip6_full_reassembly_handoff_inline (vm, node, frame, FEATURE,
false /* is_local */);
}
VLIB_REGISTER_NODE (ip6_full_reassembly_feature_handoff_node) = {
.name = "ip6-full-reass-feature-hoff",
.vector_size = sizeof (u32),
.n_errors = ARRAY_LEN(ip6_full_reassembly_handoff_error_strings),
.error_strings = ip6_full_reassembly_handoff_error_strings,
.format_trace = format_ip6_full_reassembly_handoff_trace,
.n_next_nodes = 1,
.next_nodes = {
[0] = "error-drop",
},
};
VLIB_NODE_FN (ip6_full_reassembly_custom_handoff_node)
(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
{
return ip6_full_reassembly_handoff_inline (vm, node, frame, CUSTOM,
false /* is_local */);
}
VLIB_REGISTER_NODE (ip6_full_reassembly_custom_handoff_node) = {
.name = "ip6-full-reass-custom-hoff",
.vector_size = sizeof (u32),
.n_errors = ARRAY_LEN(ip6_full_reassembly_handoff_error_strings),
.error_strings = ip6_full_reassembly_handoff_error_strings,
.format_trace = format_ip6_full_reassembly_handoff_trace,
.n_next_nodes = 1,
.next_nodes = {
[0] = "error-drop",
},
};
#ifndef CLIB_MARCH_VARIANT
int
ip6_full_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
{
ip6_full_reass_main_t *rm = &ip6_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 ("ip6-unicast",
"ip6-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 ("ip6-unicast",
"ip6-full-reassembly-feature",
sw_if_index, 0, 0, 0);
}
return -1;
}
void
ip6_local_full_reass_enable_disable (int enable)
{
if (enable)
{
if (!ip6_full_reass_main.is_local_reass_enabled)
{
ip6_full_reass_main.is_local_reass_enabled = 1;
ip6_register_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION,
ip6_local_full_reass_node.index);
}
}
else
{
if (ip6_full_reass_main.is_local_reass_enabled)
{
ip6_full_reass_main.is_local_reass_enabled = 0;
ip6_unregister_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION);
}
}
}
int
ip6_local_full_reass_enabled ()
{
return ip6_full_reass_main.is_local_reass_enabled;
}
#endif
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/