blob: e84daf6a21c0cb1325be79e672e3f6fd0535a3b8 [file] [log] [blame]
/*
* Copyright (c) 2017 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @file
* @brief IPv6 Reassembly.
*
* This file contains the source code for IPv6 reassembly.
*/
#include <vppinfra/vec.h>
#include <vnet/vnet.h>
#include <vnet/ip/ip.h>
#include <vppinfra/bihash_48_8.h>
#include <vnet/ip/ip6_reassembly.h>
#define MSEC_PER_SEC 1000
#define IP6_REASS_TIMEOUT_DEFAULT_MS 100
#define IP6_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000 // 10 seconds default
#define IP6_REASS_MAX_REASSEMBLIES_DEFAULT 1024
#define IP6_REASS_HT_LOAD_FACTOR (0.75)
static vlib_node_registration_t ip6_reass_node;
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_reass_key_t;
always_inline u32
ip6_reass_buffer_get_data_offset_no_check (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 u32
ip6_reass_buffer_get_data_offset (vlib_buffer_t * b)
{
vnet_buffer_opaque_t *vnb = vnet_buffer (b);
ASSERT (vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first);
return ip6_reass_buffer_get_data_offset_no_check (b);
}
always_inline u16
ip6_reass_buffer_get_data_len_no_check (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_reass_buffer_get_data_offset (b)) + 1;
}
always_inline u16
ip6_reass_buffer_get_data_len (vlib_buffer_t * b)
{
vnet_buffer_opaque_t *vnb = vnet_buffer (b);
ASSERT (vnb->ip.reass.range_last > vnb->ip.reass.fragment_first);
return ip6_reass_buffer_get_data_len_no_check (b);
}
typedef struct
{
// hash table key
ip6_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
u8 next_index;
// minimum fragment length for this reassembly - used to estimate MTU
u16 min_fragment_length;
} ip6_reass_t;
typedef struct
{
ip6_reass_t *pool;
u32 reass_n;
u32 buffers_n;
u32 id_counter;
clib_spinlock_t lock;
} ip6_reass_per_thread_t;
typedef struct
{
// IPv6 config
u32 timeout_ms;
f64 timeout;
u32 expire_walk_interval_ms;
u32 max_reass_n;
// IPv6 runtime
clib_bihash_48_8_t hash;
// per-thread data
ip6_reass_per_thread_t *per_thread_data;
// convenience
vlib_main_t *vlib_main;
vnet_main_t *vnet_main;
// node index of ip6-drop node
u32 ip6_drop_idx;
u32 ip6_icmp_error_idx;
u32 ip6_reass_expire_node_idx;
} ip6_reass_main_t;
ip6_reass_main_t ip6_reass_main;
typedef enum
{
IP6_REASSEMBLY_NEXT_INPUT,
IP6_REASSEMBLY_NEXT_DROP,
IP6_REASSEMBLY_NEXT_ICMP_ERROR,
IP6_REASSEMBLY_N_NEXT,
} ip6_reass_next_t;
typedef enum
{
RANGE_NEW,
RANGE_OVERLAP,
ICMP_ERROR_RT_EXCEEDED,
ICMP_ERROR_FL_TOO_BIG,
ICMP_ERROR_FL_NOT_MULT_8,
FINALIZE,
} ip6_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_reass_range_trace_t;
typedef struct
{
ip6_reass_trace_operation_e action;
u32 reass_id;
ip6_reass_range_trace_t trace_range;
u32 size_diff;
u32 op_id;
u32 fragment_first;
u32 fragment_last;
u32 total_data_len;
} ip6_reass_trace_t;
static void
ip6_reass_trace_details (vlib_main_t * vm, u32 bi,
ip6_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_reass_buffer_get_data_offset_no_check (b);
trace->data_len = ip6_reass_buffer_get_data_len_no_check (b);
trace->range_bi = bi;
}
static u8 *
format_ip6_reass_range_trace (u8 * s, va_list * args)
{
ip6_reass_range_trace_t *trace = va_arg (*args, ip6_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_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_reass_trace_t *t = va_arg (*args, ip6_reass_trace_t *);
s = format (s, "reass id: %u, op id: %u ", t->reass_id, t->op_id);
u32 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_reass_range_trace, &t->trace_range);
break;
case RANGE_OVERLAP:
s = format (s, "\n%Uoverlap %U", format_white_space, indent,
format_ip6_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_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_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;
}
return s;
}
static void
ip6_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
ip6_reass_main_t * rm, ip6_reass_t * reass,
u32 bi, ip6_reass_trace_operation_e action,
u32 size_diff)
{
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, b->trace_index))
{
// this buffer's trace is gone
b->flags &= ~VLIB_BUFFER_IS_TRACED;
return;
}
ip6_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
t->reass_id = reass->id;
t->action = action;
ip6_reass_trace_details (vm, bi, &t->trace_range);
t->size_diff = size_diff;
t->op_id = reass->trace_op_counter;
++reass->trace_op_counter;
t->fragment_first = vnb->ip.reass.fragment_first;
t->fragment_last = vnb->ip.reass.fragment_last;
t->trace_range.first_bi = reass->first_bi;
t->total_data_len = reass->data_len;
#if 0
static u8 *s = NULL;
s = format (s, "%U", format_ip6_reass_trace, NULL, NULL, t);
printf ("%.*s\n", vec_len (s), s);
fflush (stdout);
vec_reset_length (s);
#endif
}
always_inline void
ip6_reass_free (ip6_reass_main_t * rm, ip6_reass_per_thread_t * rt,
ip6_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);
pool_put (rt->pool, reass);
--rt->reass_n;
}
always_inline void
ip6_reass_drop_all (vlib_main_t * vm, ip6_reass_main_t * rm,
ip6_reass_t * reass, u32 ** vec_drop_bi)
{
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;
while (~0 != bi)
{
vec_add1 (*vec_drop_bi, 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;
}
}
always_inline void
ip6_reass_on_timeout (vlib_main_t * vm, vlib_node_runtime_t * node,
ip6_reass_main_t * rm, ip6_reass_t * reass,
u32 * icmp_bi, u32 ** vec_timeout)
{
if (~0 == reass->first_bi)
{
return;
}
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_reass_add_trace (vm, node, rm, reass, reass->first_bi,
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_reass_drop_all (vm, rm, reass, vec_timeout);
}
always_inline ip6_reass_t *
ip6_reass_find_or_create (vlib_main_t * vm, vlib_node_runtime_t * node,
ip6_reass_main_t * rm, ip6_reass_per_thread_t * rt,
ip6_reass_key_t * k, u32 * icmp_bi,
u32 ** vec_timeout)
{
ip6_reass_t *reass = NULL;
f64 now = vlib_time_now (rm->vlib_main);
clib_bihash_kv_48_8_t kv, value;
kv.key[0] = k->as_u64[0];
kv.key[1] = k->as_u64[1];
kv.key[2] = k->as_u64[2];
kv.key[3] = k->as_u64[3];
kv.key[4] = k->as_u64[4];
kv.key[5] = k->as_u64[5];
if (!clib_bihash_search_48_8 (&rm->hash, &kv, &value))
{
reass = pool_elt_at_index (rt->pool, value.value);
if (now > reass->last_heard + rm->timeout)
{
ip6_reass_on_timeout (vm, node, rm, reass, icmp_bi, vec_timeout);
ip6_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);
memset (reass, 0, sizeof (*reass));
reass->id =
((u64) os_get_thread_index () * 1000000000) + rt->id_counter;
++rt->id_counter;
reass->first_bi = ~0;
reass->last_packet_octet = ~0;
reass->data_len = 0;
++rt->reass_n;
}
reass->key.as_u64[0] = kv.key[0] = k->as_u64[0];
reass->key.as_u64[1] = kv.key[1] = k->as_u64[1];
reass->key.as_u64[2] = kv.key[2] = k->as_u64[2];
reass->key.as_u64[3] = kv.key[3] = k->as_u64[3];
reass->key.as_u64[4] = kv.key[4] = k->as_u64[4];
reass->key.as_u64[5] = kv.key[5] = k->as_u64[5];
kv.value = reass - rt->pool;
reass->last_heard = now;
if (clib_bihash_add_del_48_8 (&rm->hash, &kv, 1))
{
ip6_reass_free (rm, rt, reass);
reass = NULL;
}
return reass;
}
always_inline void
ip6_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node,
ip6_reass_main_t * rm, ip6_reass_per_thread_t * rt,
ip6_reass_t * reass, u32 * bi0, u32 * next0,
u32 * error0, u32 ** vec_drop_compress, bool is_feature)
{
ASSERT (~0 != reass->first_bi);
*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;
do
{
u32 tmp_bi = sub_chain_bi;
vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi);
u32 data_len = ip6_reass_buffer_get_data_len (tmp);
u32 trim_front = vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset +
sizeof (*frag_hdr) + ip6_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 */
ASSERT (0 == ip6_reass_buffer_get_data_offset (tmp));
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));
ASSERT (vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0);
}
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 */
vec_add1 (*vec_drop_compress, tmp_bi);
++dropped_cnt;
trim_front -= tmp->current_length;
ASSERT (tmp->flags & VLIB_BUFFER_NEXT_PRESENT);
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;
ASSERT (tmp->flags & VLIB_BUFFER_NEXT_PRESENT);
}
total_length += tmp->current_length;
}
else
{
vec_add1 (*vec_drop_compress, tmp_bi);
ASSERT (reass->first_bi != 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);
ASSERT (last_b != NULL);
last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi);
ASSERT (total_length >= first_b->current_length);
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_header_t *prev_hdr;
ip6_ext_header_find_t (ip, prev_hdr, frag_hdr,
IP_PROTOCOL_IPV6_FRAGMENTATION);
if (prev_hdr)
{
prev_hdr->next_hdr = frag_hdr->next_hdr;
}
else
{
ip->protocol = frag_hdr->next_hdr;
}
ASSERT ((u8 *) frag_hdr - (u8 *) ip == ip6_frag_hdr_offset);
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));
vlib_buffer_chain_compress (vm, first_b, vec_drop_compress);
if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED))
{
ip6_reass_add_trace (vm, node, rm, reass, reass->first_bi, 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_feature)
{
*next0 = IP6_REASSEMBLY_NEXT_INPUT;
}
else
{
*next0 = reass->next_index;
}
vnet_buffer (first_b)->ip.reass.estimated_mtu = reass->min_fragment_length;
ip6_reass_free (rm, rt, reass);
reass = NULL;
}
always_inline u32
ip6_reass_get_buffer_chain_length (vlib_main_t * vm, vlib_buffer_t * b)
{
u32 len = 0;
while (b)
{
++len;
if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT))
{
b = vlib_get_buffer (vm, b->next_buffer);
}
else
{
break;
}
}
return len;
}
always_inline void
ip6_reass_insert_range_in_chain (vlib_main_t * vm, ip6_reass_main_t * rm,
ip6_reass_per_thread_t * rt,
ip6_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_reass_buffer_get_data_len (new_next_b);
rt->buffers_n += ip6_reass_get_buffer_chain_length (vm, new_next_b);
}
always_inline void
ip6_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
ip6_reass_main_t * rm, ip6_reass_per_thread_t * rt,
ip6_reass_t * reass, u32 * bi0, u32 * next0,
u32 * error0, ip6_frag_hdr_t * frag_hdr,
u32 ** vec_drop_overlap, u32 ** vec_drop_compress,
bool is_feature)
{
int consumed = 0;
vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
reass->next_index = fvnb->ip.reass.next_index; // store next_index before it's 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);
ASSERT (fb->current_length > sizeof (*fip));
ASSERT (fvnb->ip.reass.ip6_frag_hdr_offset > 0 &&
fvnb->ip.reass.ip6_frag_hdr_offset < fb->current_length);
u32 fragment_first = fvnb->ip.reass.fragment_first =
ip6_frag_hdr_offset_bytes (frag_hdr);
u32 fragment_length =
vlib_buffer_length_in_chain (vm, fb) -
(fvnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
u32 fragment_last = fvnb->ip.reass.fragment_last =
fragment_first + fragment_length - 1;
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_reass_insert_range_in_chain (vm, rm, rt, reass, prev_range_bi,
*bi0);
if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
{
ip6_reass_add_trace (vm, node, rm, reass, *bi0, RANGE_NEW, 0);
}
reass->min_fragment_length = clib_net_to_host_u16 (fip->payload_length);
*bi0 = ~0;
return;
}
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_reass_insert_range_in_chain (vm, rm, rt, 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_reass_insert_range_in_chain (vm, rm, rt, 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
ip6_reass_drop_all (vm, rm, reass, vec_drop_overlap);
ip6_reass_free (rm, rt, reass);
if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
{
ip6_reass_add_trace (vm, node, rm, reass, *bi0, RANGE_OVERLAP,
0);
}
*next0 = IP6_REASSEMBLY_NEXT_DROP;
*error0 = IP6_ERROR_REASS_OVERLAPPING_FRAGMENT;
}
break;
}
if (consumed)
{
if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
{
ip6_reass_add_trace (vm, node, rm, reass, *bi0, RANGE_NEW, 0);
}
}
if (~0 != reass->last_packet_octet &&
reass->data_len == reass->last_packet_octet + 1)
{
ip6_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0,
vec_drop_compress, is_feature);
}
else
{
if (consumed)
{
*bi0 = ~0;
}
else
{
*next0 = IP6_REASSEMBLY_NEXT_DROP;
;
*error0 = IP6_ERROR_REASS_DUPLICATE_FRAGMENT;
}
}
}
always_inline bool
ip6_reass_verify_upper_layer_present (vlib_node_runtime_t * node,
vlib_buffer_t * b,
ip6_frag_hdr_t * frag_hdr)
{
ip6_ext_header_t *tmp = (ip6_ext_header_t *) frag_hdr;
while (ip6_ext_hdr (tmp->next_hdr))
{
tmp = ip6_ext_next_header (tmp);
}
if (IP_PROTOCOL_IP6_NONXT == tmp->next_hdr)
{
icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
ICMP6_parameter_problem_first_fragment_has_incomplete_header_chain,
0);
b->error = node->errors[IP6_ERROR_REASS_MISSING_UPPER];
return false;
}
return true;
}
always_inline bool
ip6_reass_verify_fragment_multiple_8 (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_buffer_t * b,
ip6_frag_hdr_t * frag_hdr)
{
vnet_buffer_opaque_t *vnb = vnet_buffer (b);
ip6_header_t *ip = vlib_buffer_get_current (b);
int more_fragments = ip6_frag_hdr_more (frag_hdr);
u32 fragment_length =
vlib_buffer_length_in_chain (vm, b) -
(vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
if (more_fragments && 0 != fragment_length % 8)
{
icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
ICMP6_parameter_problem_erroneous_header_field,
(u8 *) & ip->payload_length - (u8 *) ip);
return false;
}
return true;
}
always_inline bool
ip6_reass_verify_packet_size_lt_64k (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_buffer_t * b,
ip6_frag_hdr_t * frag_hdr)
{
vnet_buffer_opaque_t *vnb = vnet_buffer (b);
u32 fragment_first = ip6_frag_hdr_offset_bytes (frag_hdr);
u32 fragment_length =
vlib_buffer_length_in_chain (vm, b) -
(vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
if (fragment_first + fragment_length > 65535)
{
ip6_header_t *ip0 = vlib_buffer_get_current (b);
icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem,
ICMP6_parameter_problem_erroneous_header_field,
(u8 *) & frag_hdr->fragment_offset_and_more
- (u8 *) ip0);
return false;
}
return true;
}
always_inline uword
ip6_reassembly_inline (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame, bool is_feature)
{
u32 *from = vlib_frame_vector_args (frame);
u32 n_left_from, n_left_to_next, *to_next, next_index;
ip6_reass_main_t *rm = &ip6_reass_main;
ip6_reass_per_thread_t *rt = &rm->per_thread_data[os_get_thread_index ()];
clib_spinlock_lock (&rt->lock);
n_left_from = frame->n_vectors;
next_index = node->cached_next_index;
static u32 *vec_timeout = NULL; // indexes of buffers which timed out
static u32 *vec_drop_overlap = NULL; // indexes of buffers dropped due to overlap
static u32 *vec_drop_compress = NULL; // indexes of buffers dropped due to buffer compression
while (n_left_from > 0 || vec_len (vec_timeout) > 0 ||
vec_len (vec_drop_overlap) > 0 || vec_len (vec_drop_compress) > 0)
{
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
while (vec_len (vec_timeout) > 0 && n_left_to_next > 0)
{
u32 bi = vec_pop (vec_timeout);
vlib_buffer_t *b = vlib_get_buffer (vm, bi);
b->error = node->errors[IP6_ERROR_REASS_TIMEOUT];
to_next[0] = bi;
to_next += 1;
n_left_to_next -= 1;
vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
n_left_to_next, bi,
IP6_REASSEMBLY_NEXT_DROP);
ASSERT (rt->buffers_n > 0);
--rt->buffers_n;
}
while (vec_len (vec_drop_overlap) > 0 && n_left_to_next > 0)
{
u32 bi = vec_pop (vec_drop_overlap);
vlib_buffer_t *b = vlib_get_buffer (vm, bi);
b->error = node->errors[IP6_ERROR_REASS_OVERLAPPING_FRAGMENT];
to_next[0] = bi;
to_next += 1;
n_left_to_next -= 1;
vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
n_left_to_next, bi,
IP6_REASSEMBLY_NEXT_DROP);
ASSERT (rt->buffers_n > 0);
--rt->buffers_n;
}
while (vec_len (vec_drop_compress) > 0 && n_left_to_next > 0)
{
u32 bi = vec_pop (vec_drop_compress);
vlib_buffer_t *b = vlib_get_buffer (vm, bi);
b->error = node->errors[IP6_ERROR_NONE];
to_next[0] = bi;
to_next += 1;
n_left_to_next -= 1;
vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
n_left_to_next, bi,
IP6_REASSEMBLY_NEXT_DROP);
ASSERT (rt->buffers_n > 0);
--rt->buffers_n;
}
while (n_left_from > 0 && n_left_to_next > 0)
{
u32 bi0;
vlib_buffer_t *b0;
u32 next0;
u32 error0 = IP6_ERROR_NONE;
u32 icmp_bi = ~0;
bi0 = from[0];
b0 = vlib_get_buffer (vm, bi0);
ip6_header_t *ip0 = vlib_buffer_get_current (b0);
ip6_frag_hdr_t *frag_hdr = NULL;
ip6_ext_header_t *prev_hdr;
if (ip6_ext_hdr (ip0->protocol))
{
ip6_ext_header_find_t (ip0, prev_hdr, frag_hdr,
IP_PROTOCOL_IPV6_FRAGMENTATION);
}
if (!frag_hdr)
{
// this is a regular packet - no fragmentation
next0 = IP6_REASSEMBLY_NEXT_INPUT;
goto skip_reass;
}
if (0 == ip6_frag_hdr_offset (frag_hdr))
{
// first fragment - verify upper-layer is present
if (!ip6_reass_verify_upper_layer_present (node, b0, frag_hdr))
{
next0 = IP6_REASSEMBLY_NEXT_ICMP_ERROR;
goto skip_reass;
}
}
if (!ip6_reass_verify_fragment_multiple_8 (vm, node, b0, frag_hdr)
|| !ip6_reass_verify_packet_size_lt_64k (vm, node, b0,
frag_hdr))
{
next0 = IP6_REASSEMBLY_NEXT_ICMP_ERROR;
goto skip_reass;
}
vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
(u8 *) frag_hdr - (u8 *) ip0;
ip6_reass_key_t k;
k.as_u64[0] = ip0->src_address.as_u64[0];
k.as_u64[1] = ip0->src_address.as_u64[1];
k.as_u64[2] = ip0->dst_address.as_u64[0];
k.as_u64[3] = ip0->dst_address.as_u64[1];
k.as_u64[4] =
(u64) vnet_buffer (b0)->
sw_if_index[VLIB_RX] << 32 | frag_hdr->identification;
k.as_u64[5] = ip0->protocol;
ip6_reass_t *reass =
ip6_reass_find_or_create (vm, node, rm, rt, &k, &icmp_bi,
&vec_timeout);
if (reass)
{
ip6_reass_update (vm, node, rm, rt, reass, &bi0, &next0,
&error0, frag_hdr, &vec_drop_overlap,
&vec_drop_compress, is_feature);
}
else
{
next0 = IP6_REASSEMBLY_NEXT_DROP;
error0 = IP6_ERROR_REASS_LIMIT_REACHED;
}
b0->error = node->errors[error0];
if (~0 != bi0)
{
skip_reass:
to_next[0] = bi0;
to_next += 1;
n_left_to_next -= 1;
if (is_feature && IP6_ERROR_NONE == error0)
{
vnet_feature_next (vnet_buffer (b0)->sw_if_index[VLIB_RX],
&next0, b0);
}
vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
n_left_to_next, bi0, next0);
}
if (~0 != icmp_bi)
{
next0 = IP6_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);
}
from += 1;
n_left_from -= 1;
}
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
}
clib_spinlock_unlock (&rt->lock);
return frame->n_vectors;
}
static char *ip6_reassembly_error_strings[] = {
#define _(sym, string) string,
foreach_ip6_error
#undef _
};
static uword
ip6_reassembly (vlib_main_t * vm, vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
return ip6_reassembly_inline (vm, node, frame, false /* is_feature */ );
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip6_reass_node, static) = {
.function = ip6_reassembly,
.name = "ip6-reassembly",
.vector_size = sizeof (u32),
.format_trace = format_ip6_reass_trace,
.n_errors = ARRAY_LEN (ip6_reassembly_error_strings),
.error_strings = ip6_reassembly_error_strings,
.n_next_nodes = IP6_REASSEMBLY_N_NEXT,
.next_nodes =
{
[IP6_REASSEMBLY_NEXT_INPUT] = "ip6-input",
[IP6_REASSEMBLY_NEXT_DROP] = "ip6-drop",
[IP6_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
},
};
/* *INDENT-ON* */
VLIB_NODE_FUNCTION_MULTIARCH (ip6_reass_node, ip6_reassembly);
static uword
ip6_reassembly_feature (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * frame)
{
return ip6_reassembly_inline (vm, node, frame, true /* is_feature */ );
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip6_reass_node_feature, static) = {
.function = ip6_reassembly_feature,
.name = "ip6-reassembly-feature",
.vector_size = sizeof (u32),
.format_trace = format_ip6_reass_trace,
.n_errors = ARRAY_LEN (ip6_reassembly_error_strings),
.error_strings = ip6_reassembly_error_strings,
.n_next_nodes = IP6_REASSEMBLY_N_NEXT,
.next_nodes =
{
[IP6_REASSEMBLY_NEXT_INPUT] = "ip6-input",
[IP6_REASSEMBLY_NEXT_DROP] = "ip6-drop",
[IP6_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error",
},
};
/* *INDENT-ON* */
VLIB_NODE_FUNCTION_MULTIARCH (ip6_reass_node_feature, ip6_reassembly_feature);
/* *INDENT-OFF* */
VNET_FEATURE_INIT (ip6_reassembly_feature, static) = {
.arc_name = "ip6-unicast",
.node_name = "ip6-reassembly-feature",
.runs_before = VNET_FEATURES ("ip6-lookup"),
.runs_after = 0,
};
/* *INDENT-ON* */
static u32
ip6_reass_get_nbuckets ()
{
ip6_reass_main_t *rm = &ip6_reass_main;
u32 nbuckets;
u8 i;
nbuckets = (u32) (rm->max_reass_n / IP6_REASS_HT_LOAD_FACTOR);
for (i = 0; i < 31; i++)
if ((1 << i) >= nbuckets)
break;
nbuckets = 1 << i;
return nbuckets;
}
typedef enum
{
IP6_EVENT_CONFIG_CHANGED = 1,
} ip6_reass_event_t;
typedef struct
{
int failure;
clib_bihash_48_8_t *new_hash;
} ip6_rehash_cb_ctx;
static void
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;
}
}
static void
ip6_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
u32 expire_walk_interval_ms)
{
ip6_reass_main.timeout_ms = timeout_ms;
ip6_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
ip6_reass_main.max_reass_n = max_reassemblies;
ip6_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
}
vnet_api_error_t
ip6_reass_set (u32 timeout_ms, u32 max_reassemblies,
u32 expire_walk_interval_ms)
{
u32 old_nbuckets = ip6_reass_get_nbuckets ();
ip6_reass_set_params (timeout_ms, max_reassemblies,
expire_walk_interval_ms);
vlib_process_signal_event (ip6_reass_main.vlib_main,
ip6_reass_main.ip6_reass_expire_node_idx,
IP6_EVENT_CONFIG_CHANGED, 0);
u32 new_nbuckets = ip6_reass_get_nbuckets ();
if (ip6_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
{
clib_bihash_48_8_t new_hash;
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-reass", new_nbuckets,
new_nbuckets * 1024);
clib_bihash_foreach_key_value_pair_48_8 (&ip6_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_reass_main.hash);
clib_memcpy (&ip6_reass_main.hash, &new_hash,
sizeof (ip6_reass_main.hash));
}
}
return 0;
}
vnet_api_error_t
ip6_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
u32 * expire_walk_interval_ms)
{
*timeout_ms = ip6_reass_main.timeout_ms;
*max_reassemblies = ip6_reass_main.max_reass_n;
*expire_walk_interval_ms = ip6_reass_main.expire_walk_interval_ms;
return 0;
}
static clib_error_t *
ip6_reass_init_function (vlib_main_t * vm)
{
ip6_reass_main_t *rm = &ip6_reass_main;
clib_error_t *error = 0;
u32 nbuckets;
vlib_node_t *node;
rm->vlib_main = vm;
rm->vnet_main = vnet_get_main ();
vec_validate (rm->per_thread_data, vlib_num_workers () + 1);
ip6_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-reassembly-expire-walk");
ASSERT (node);
rm->ip6_reass_expire_node_idx = node->index;
ip6_reass_set_params (IP6_REASS_TIMEOUT_DEFAULT_MS,
IP6_REASS_MAX_REASSEMBLIES_DEFAULT,
IP6_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
nbuckets = ip6_reass_get_nbuckets ();
clib_bihash_init_48_8 (&rm->hash, "ip6-reass", nbuckets, nbuckets * 1024);
node = vlib_get_node_by_name (vm, (u8 *) "ip6-drop");
ASSERT (node);
rm->ip6_drop_idx = node->index;
node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error");
ASSERT (node);
rm->ip6_icmp_error_idx = node->index;
if ((error = vlib_call_init_function (vm, ip_main_init)))
return error;
ip6_register_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION,
ip6_reass_node.index);
return error;
}
VLIB_INIT_FUNCTION (ip6_reass_init_function);
static uword
ip6_reass_walk_expired (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * f)
{
ip6_reass_main_t *rm = &ip6_reass_main;
uword event_type, *event_data = 0;
while (true)
{
vlib_process_wait_for_event_or_clock (vm,
(f64) rm->expire_walk_interval_ms
/ (f64) MSEC_PER_SEC);
event_type = vlib_process_get_events (vm, &event_data);
switch (event_type)
{
case ~0: /* no events => timeout */
/* nothing to do here */
break;
case IP6_EVENT_CONFIG_CHANGED:
break;
default:
clib_warning ("BUG: event type 0x%wx", event_type);
break;
}
f64 now = vlib_time_now (vm);
ip6_reass_t *reass;
u32 *vec_timeout = NULL;
int *pool_indexes_to_free = NULL;
uword thread_index = 0;
int index;
const uword nthreads = os_get_nthreads ();
u32 *vec_icmp_bi = NULL;
for (thread_index = 0; thread_index < nthreads; ++thread_index)
{
ip6_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
clib_spinlock_lock (&rt->lock);
vec_reset_length (pool_indexes_to_free);
/* *INDENT-OFF* */
pool_foreach_index (index, rt->pool, ({
reass = pool_elt_at_index (rt->pool, index);
if (now > reass->last_heard + rm->timeout)
{
vec_add1 (pool_indexes_to_free, index);
}
}));
/* *INDENT-ON* */
int *i;
/* *INDENT-OFF* */
vec_foreach (i, pool_indexes_to_free)
{
ip6_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
u32 icmp_bi = ~0;
u32 before = vec_len (vec_timeout);
vlib_buffer_t *b = vlib_get_buffer (vm, reass->first_bi);
if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
{
if (pool_is_free_index (vm->trace_main.trace_buffer_pool,
b->trace_index))
{
/* the trace is gone, don't trace this buffer anymore */
b->flags &= ~VLIB_BUFFER_IS_TRACED;
}
}
ip6_reass_on_timeout (vm, node, rm, reass, &icmp_bi, &vec_timeout);
u32 after = vec_len (vec_timeout);
ASSERT (rt->buffers_n >= (after - before));
rt->buffers_n -= (after - before);
if (~0 != icmp_bi)
{
vec_add1 (vec_icmp_bi, icmp_bi);
ASSERT (rt->buffers_n > 0);
--rt->buffers_n;
}
ip6_reass_free (rm, rt, reass);
}
/* *INDENT-ON* */
clib_spinlock_unlock (&rt->lock);
}
while (vec_len (vec_timeout) > 0)
{
vlib_frame_t *f = vlib_get_frame_to_node (vm, rm->ip6_drop_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_timeout) > 0 && n_left_to_next > 0)
{
u32 bi = vec_pop (vec_timeout);
vlib_buffer_t *b = vlib_get_buffer (vm, bi);
if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
{
if (pool_is_free_index (vm->trace_main.trace_buffer_pool,
b->trace_index))
{
/* the trace is gone, don't trace this buffer anymore */
b->flags &= ~VLIB_BUFFER_IS_TRACED;
}
else
{
trace_frame = 1;
}
}
b->error = node->errors[IP6_ERROR_REASS_TIMEOUT];
to_next[0] = bi;
++f->n_vectors;
to_next += 1;
n_left_to_next -= 1;
}
f->flags |= (trace_frame * VLIB_FRAME_TRACE);
vlib_put_frame_to_node (vm, rm->ip6_drop_idx, f);
}
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))
{
if (pool_is_free_index (vm->trace_main.trace_buffer_pool,
b->trace_index))
{
/* the trace is gone, don't trace this buffer anymore */
b->flags &= ~VLIB_BUFFER_IS_TRACED;
}
else
{
trace_frame = 1;
}
}
b->error = node->errors[IP6_ERROR_REASS_TIMEOUT];
to_next[0] = bi;
++f->n_vectors;
to_next += 1;
n_left_to_next -= 1;
}
f->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_timeout);
vec_free (vec_icmp_bi);
if (event_data)
{
_vec_len (event_data) = 0;
}
}
return 0;
}
static vlib_node_registration_t ip6_reass_expire_node;
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip6_reass_expire_node, static) = {
.function = ip6_reass_walk_expired,
.format_trace = format_ip6_reass_trace,
.type = VLIB_NODE_TYPE_PROCESS,
.name = "ip6-reassembly-expire-walk",
.n_errors = ARRAY_LEN (ip6_reassembly_error_strings),
.error_strings = ip6_reassembly_error_strings,
};
/* *INDENT-ON* */
static u8 *
format_ip6_reass_key (u8 * s, va_list * args)
{
ip6_reass_key_t *key = va_arg (*args, ip6_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_reass (u8 * s, va_list * args)
{
vlib_main_t *vm = va_arg (*args, vlib_main_t *);
ip6_reass_t *reass = va_arg (*args, ip6_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_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_reass_buffer_get_data_offset_no_check (b),
ip6_reass_buffer_get_data_len_no_check (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_reass (vlib_main_t * vm, unformat_input_t * input,
CLIB_UNUSED (vlib_cli_command_t * lmd))
{
ip6_reass_main_t *rm = &ip6_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_reass_t *reass;
uword thread_index;
const uword nthreads = os_get_nthreads ();
for (thread_index = 0; thread_index < nthreads; ++thread_index)
{
ip6_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
clib_spinlock_lock (&rt->lock);
if (details)
{
/* *INDENT-OFF* */
pool_foreach (reass, rt->pool, {
vlib_cli_output (vm, "%U", format_ip6_reass, vm, reass);
});
/* *INDENT-ON* */
}
sum_reass_n += rt->reass_n;
sum_buffers_n += rt->buffers_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 IP6 reassemblies per "
"worker-thread: %lu\n", (long unsigned) rm->max_reass_n);
vlib_cli_output (vm, "Buffers in use: %lu\n",
(long unsigned) sum_buffers_n);
return 0;
}
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (show_ip6_reassembly_cmd, static) = {
.path = "show ip6-reassembly",
.short_help = "show ip6-reassembly [details]",
.function = show_ip6_reass,
};
/* *INDENT-ON* */
vnet_api_error_t
ip6_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
{
return vnet_feature_enable_disable ("ip6-unicast", "ip6-reassembly-feature",
sw_if_index, enable_disable, 0, 0);
}
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/