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authorKlement Sekera <ksekera@cisco.com>2019-06-24 11:52:49 +0000
committerOle Trøan <otroan@employees.org>2019-09-25 08:23:04 +0000
commit896c896a3c4ed563a270281ff8b50fd253f4833f (patch)
tree801170d6b2d3c7ae4ff782e7f7088b4d6146d393 /src/vnet/ip/ip6_reassembly.c
parent5e2f84d2cf97a6efa89c1c4bbf80de6a8f03d2a8 (diff)
ip: refactor reassembly
this is a preparation step for introducing other reassembly types Type: refactor Change-Id: I197e299dbd729b00eead31667913b8ceff915d63 Signed-off-by: Klement Sekera <ksekera@cisco.com>
Diffstat (limited to 'src/vnet/ip/ip6_reassembly.c')
-rw-r--r--src/vnet/ip/ip6_reassembly.c1795
1 files changed, 0 insertions, 1795 deletions
diff --git a/src/vnet/ip/ip6_reassembly.c b/src/vnet/ip/ip6_reassembly.c
deleted file mode 100644
index 4f27304ca94..00000000000
--- a/src/vnet/ip/ip6_reassembly.c
+++ /dev/null
@@ -1,1795 +0,0 @@
-/*
- * 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_MAX_REASSEMBLY_LENGTH_DEFAULT 3
-#define IP6_REASS_HT_LOAD_FACTOR (0.75)
-
-typedef enum
-{
- IP6_REASS_RC_OK,
- IP6_REASS_RC_INTERNAL_ERROR,
- IP6_REASS_RC_TOO_MANY_FRAGMENTS,
- IP6_REASS_RC_NO_BUF,
- IP6_REASS_RC_HANDOFF,
-} ip6_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_reass_key_t;
-
-typedef union
-{
- struct
- {
- u32 reass_index;
- u32 memory_owner_thread_index;
- };
- u64 as_u64;
-} ip6_reass_val_t;
-
-typedef union
-{
- struct
- {
- ip6_reass_key_t k;
- ip6_reass_val_t v;
- };
- clib_bihash_kv_48_8_t kv;
-} ip6_reass_kv_t;
-
-
-always_inline u32
-ip6_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_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_reass_buffer_get_data_offset (b)) + 1;
-}
-
-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 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_reass_t;
-
-typedef struct
-{
- ip6_reass_t *pool;
- u32 reass_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;
- // 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_reass_per_thread_t *per_thread_data;
-
- // convenience
- vlib_main_t *vlib_main;
-
- // node index of ip6-drop node
- u32 ip6_drop_idx;
- u32 ip6_icmp_error_idx;
- u32 ip6_reass_expire_node_idx;
-
- /** Worker handoff */
- u32 fq_index;
- u32 fq_feature_index;
-
-} ip6_reass_main_t;
-
-extern ip6_reass_main_t ip6_reass_main;
-
-#ifndef CLIB_MARCH_VARIANT
-ip6_reass_main_t ip6_reass_main;
-#endif /* CLIB_MARCH_VARIANT */
-
-typedef enum
-{
- IP6_REASSEMBLY_NEXT_INPUT,
- IP6_REASSEMBLY_NEXT_DROP,
- IP6_REASSEMBLY_NEXT_ICMP_ERROR,
- IP6_REASSEMBLY_NEXT_HANDOFF,
- 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,
- HANDOFF,
-} 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 op_id;
- u32 fragment_first;
- u32 fragment_last;
- u32 total_data_len;
- u32 thread_id;
- u32 thread_id_to;
-} 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 (b);
- trace->data_len = ip6_reass_buffer_get_data_len (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 *);
- u32 indent = 0;
- if (~0 != t->reass_id)
- {
- s = format (s, "reass id: %u, op id: %u ", 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_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;
- case HANDOFF:
- s =
- format (s, "handoff from thread #%u to thread #%u", t->thread_id,
- t->thread_id_to);
- break;
- }
- return s;
-}
-
-static void
-ip6_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
- ip6_reass_main_t * rm, u32 reass_id, u32 op_id,
- u32 bi, u32 first_bi, u32 data_len,
- ip6_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);
- 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->op_id = op_id;
- t->thread_id = vm->thread_index;
- t->thread_id_to = thread_id_to;
- t->fragment_first = vnb->ip.reass.fragment_first;
- t->fragment_last = vnb->ip.reass.fragment_last;
- t->trace_range.first_bi = first_bi;
- t->total_data_len = 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_ctx (ip6_reass_per_thread_t * rt, ip6_reass_t * reass)
-{
- pool_put (rt->pool, reass);
- --rt->reass_n;
-}
-
-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);
- ip6_reass_free_ctx (rt, reass);
-}
-
-always_inline void
-ip6_reass_drop_all (vlib_main_t * vm, vlib_node_runtime_t * node,
- ip6_reass_main_t * rm, ip6_reass_t * reass)
-{
- u32 range_bi = reass->first_bi;
- vlib_buffer_t *range_b;
- vnet_buffer_opaque_t *range_vnb;
- u32 *to_free = NULL;
- while (~0 != range_bi)
- {
- range_b = vlib_get_buffer (vm, range_bi);
- range_vnb = vnet_buffer (range_b);
- u32 bi = range_bi;
- while (~0 != bi)
- {
- vec_add1 (to_free, bi);
- vlib_buffer_t *b = vlib_get_buffer (vm, bi);
- if (b->flags & VLIB_BUFFER_NEXT_PRESENT)
- {
- bi = b->next_buffer;
- b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
- }
- else
- {
- bi = ~0;
- }
- }
- range_bi = range_vnb->ip.reass.next_range_bi;
- }
- /* send to next_error_index */
- if (~0 != reass->error_next_index)
- {
- u32 n_left_to_next, *to_next, next_index;
-
- next_index = reass->error_next_index;
- u32 bi = ~0;
-
- while (vec_len (to_free) > 0)
- {
- vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
-
- while (vec_len (to_free) > 0 && n_left_to_next > 0)
- {
- bi = vec_pop (to_free);
-
- if (~0 != bi)
- {
- to_next[0] = bi;
- to_next += 1;
- n_left_to_next -= 1;
- }
- }
- vlib_put_next_frame (vm, node, next_index, n_left_to_next);
- }
- }
- else
- {
- vlib_buffer_free (vm, to_free, vec_len (to_free));
- }
- vec_free (to_free);
-}
-
-always_inline void
-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)
-{
- 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_reass_add_trace (vm, node, rm, reass->id,
- reass->trace_op_counter, reass->first_bi,
- reass->first_bi, reass->data_len,
- ICMP_ERROR_RT_EXCEEDED, ~0);
- ++reass->trace_op_counter;
- }
- // 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, node, rm, reass);
-}
-
-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_kv_t * kv, u32 * icmp_bi, u8 * do_handoff)
-{
- ip6_reass_t *reass;
- f64 now;
-
-again:
-
- reass = NULL;
- now = vlib_time_now (vm);
-
- if (!clib_bihash_search_48_8
- (&rm->hash, (clib_bihash_kv_48_8_t *) kv, (clib_bihash_kv_48_8_t *) kv))
- {
- reass =
- pool_elt_at_index (rm->per_thread_data
- [kv->v.memory_owner_thread_index].pool,
- kv->v.reass_index);
- if (vm->thread_index != kv->v.memory_owner_thread_index)
- {
- *do_handoff = 1;
- return reass;
- }
-
- if (now > reass->last_heard + rm->timeout)
- {
- ip6_reass_on_timeout (vm, node, rm, reass, icmp_bi);
- 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);
- 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;
- ++rt->reass_n;
- }
-
- reass->key.as_u64[0] = ((clib_bihash_kv_48_8_t *) kv)->key[0];
- reass->key.as_u64[1] = ((clib_bihash_kv_48_8_t *) kv)->key[1];
- reass->key.as_u64[2] = ((clib_bihash_kv_48_8_t *) kv)->key[2];
- reass->key.as_u64[3] = ((clib_bihash_kv_48_8_t *) kv)->key[3];
- reass->key.as_u64[4] = ((clib_bihash_kv_48_8_t *) kv)->key[4];
- reass->key.as_u64[5] = ((clib_bihash_kv_48_8_t *) kv)->key[5];
- kv->v.reass_index = (reass - rt->pool);
- kv->v.memory_owner_thread_index = vm->thread_index;
- reass->last_heard = now;
-
- int rv =
- clib_bihash_add_del_48_8 (&rm->hash, (clib_bihash_kv_48_8_t *) kv, 2);
- if (rv)
- {
- ip6_reass_free_ctx (rt, reass);
- reass = NULL;
- // if other worker created a context already work with the other copy
- if (-2 == rv)
- goto again;
- }
-
- return reass;
-}
-
-always_inline ip6_reass_rc_t
-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,
- 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_reass_rc_t rv = IP6_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_REASS_RC_INTERNAL_ERROR;
- goto free_buffers_and_return;
- }
-
- 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 */
- if (0 != ip6_reass_buffer_get_data_offset (tmp))
- {
- rv = IP6_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_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 */
- vec_add1 (vec_drop_compress, tmp_bi);
- trim_front -= tmp->current_length;
- if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT))
- {
- rv = IP6_REASS_RC_INTERNAL_ERROR;
- goto free_buffers_and_return;
- }
- 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_REASS_RC_INTERNAL_ERROR;
- goto free_buffers_and_return;
- }
- }
- total_length += tmp->current_length;
- }
- else
- {
- vec_add1 (vec_drop_compress, tmp_bi);
- if (reass->first_bi == tmp_bi)
- {
- rv = IP6_REASS_RC_INTERNAL_ERROR;
- goto free_buffers_and_return;
- }
- ++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_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_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_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;
- }
- if (!((u8 *) frag_hdr - (u8 *) ip == ip6_frag_hdr_offset))
- {
- rv = IP6_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_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_reass_add_trace (vm, node, rm, reass->id, reass->trace_op_counter,
- reass->first_bi, reass->first_bi, reass->data_len,
- FINALIZE, ~0);
- ++reass->trace_op_counter;
-#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_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;
-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_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);
-}
-
-always_inline ip6_reass_rc_t
-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, bool is_custom_app,
- u32 * handoff_thread_idx)
-{
- 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_REASS_RC_INTERNAL_ERROR;
- }
-
- u32 fragment_first = fvnb->ip.reass.fragment_first =
- ip6_frag_hdr_offset_bytes (frag_hdr);
- u32 fragment_length =
- vlib_buffer_length_in_chain (vm, fb) -
- (fvnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr));
- u32 fragment_last = fvnb->ip.reass.fragment_last =
- fragment_first + fragment_length - 1;
- 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);
- 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_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, node, rm, reass);
- ip6_reass_free (rm, rt, reass);
- if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
- {
- ip6_reass_add_trace (vm, node, rm, reass->id,
- reass->trace_op_counter, *bi0,
- reass->first_bi, reass->data_len,
- RANGE_OVERLAP, ~0);
- ++reass->trace_op_counter;
- }
- *next0 = IP6_REASSEMBLY_NEXT_DROP;
- *error0 = IP6_ERROR_REASS_OVERLAPPING_FRAGMENT;
- return IP6_REASS_RC_OK;
- }
- break;
- }
- ++reass->fragments_n;
-check_if_done_maybe:
- if (consumed)
- {
- if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
- {
- ip6_reass_add_trace (vm, node, rm, reass->id,
- reass->trace_op_counter, *bi0, reass->first_bi,
- reass->data_len, RANGE_NEW, ~0);
- ++reass->trace_op_counter;
- }
- }
- if (~0 != reass->last_packet_octet &&
- reass->data_len == reass->last_packet_octet + 1)
- {
- *handoff_thread_idx = reass->sendout_thread_index;
- ip6_reass_rc_t rc =
- ip6_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0,
- is_custom_app);
- if (IP6_REASS_RC_OK == rc
- && reass->memory_owner_thread_index != reass->sendout_thread_index)
- {
- return IP6_REASS_RC_HANDOFF;
- }
- return rc;
- }
- else
- {
- if (consumed)
- {
- *bi0 = ~0;
- if (reass->fragments_n > rm->max_reass_len)
- {
- return IP6_REASS_RC_TOO_MANY_FRAGMENTS;
- }
- }
- else
- {
- *next0 = IP6_REASSEMBLY_NEXT_DROP;
- *error0 = IP6_ERROR_REASS_DUPLICATE_FRAGMENT;
- }
- }
- return IP6_REASS_RC_OK;
-}
-
-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,
- bool is_custom_app)
-{
- 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[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_REASSEMBLY_NEXT_DROP;
- u32 error0 = IP6_ERROR_NONE;
- u32 icmp_bi = ~0;
-
- bi0 = from[0];
- b0 = vlib_get_buffer (vm, bi0);
-
- ip6_header_t *ip0 = vlib_buffer_get_current (b0);
- ip6_frag_hdr_t *frag_hdr = NULL;
- ip6_ext_header_t *prev_hdr;
- if (ip6_ext_hdr (ip0->protocol))
- {
- 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_kv_t kv;
- u8 do_handoff = 0;
-
- kv.k.as_u64[0] = ip0->src_address.as_u64[0];
- kv.k.as_u64[1] = ip0->src_address.as_u64[1];
- kv.k.as_u64[2] = ip0->dst_address.as_u64[0];
- kv.k.as_u64[3] = ip0->dst_address.as_u64[1];
- kv.k.as_u64[4] =
- ((u64) vec_elt (ip6_main.fib_index_by_sw_if_index,
- vnet_buffer (b0)->sw_if_index[VLIB_RX])) << 32 |
- (u64) frag_hdr->identification;
- kv.k.as_u64[5] = ip0->protocol;
-
- ip6_reass_t *reass =
- ip6_reass_find_or_create (vm, node, rm, rt, &kv, &icmp_bi,
- &do_handoff);
-
- 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_REASSEMBLY_NEXT_HANDOFF;
- if (is_feature)
- vnet_buffer (b0)->ip.reass.owner_feature_thread_index =
- kv.v.memory_owner_thread_index;
- else
- vnet_buffer (b0)->ip.reass.owner_thread_index =
- kv.v.memory_owner_thread_index;
- }
- else if (reass)
- {
- u32 handoff_thread_idx;
- switch (ip6_reass_update (vm, node, rm, rt, reass, &bi0, &next0,
- &error0, frag_hdr, is_custom_app,
- &handoff_thread_idx))
- {
- case IP6_REASS_RC_OK:
- /* nothing to do here */
- break;
- case IP6_REASS_RC_HANDOFF:
- next0 = IP6_REASSEMBLY_NEXT_HANDOFF;
- b0 = vlib_get_buffer (vm, bi0);
- if (is_feature)
- vnet_buffer (b0)->ip.reass.owner_feature_thread_index =
- handoff_thread_idx;
- else
- vnet_buffer (b0)->ip.reass.owner_thread_index =
- handoff_thread_idx;
- break;
- case IP6_REASS_RC_TOO_MANY_FRAGMENTS:
- vlib_node_increment_counter (vm, node->node_index,
- IP6_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
- 1);
- ip6_reass_drop_all (vm, node, rm, reass);
- ip6_reass_free (rm, rt, reass);
- goto next_packet;
- break;
- case IP6_REASS_RC_NO_BUF:
- vlib_node_increment_counter (vm, node->node_index,
- IP6_ERROR_REASS_NO_BUF, 1);
- ip6_reass_drop_all (vm, node, rm, reass);
- ip6_reass_free (rm, rt, reass);
- goto next_packet;
- break;
- case IP6_REASS_RC_INTERNAL_ERROR:
- /* drop everything and start with a clean slate */
- vlib_node_increment_counter (vm, node->node_index,
- IP6_ERROR_REASS_INTERNAL_ERROR,
- 1);
- ip6_reass_drop_all (vm, node, rm, reass);
- ip6_reass_free (rm, rt, reass);
- goto next_packet;
- break;
- }
- }
- else
- {
- if (is_feature)
- {
- next0 = IP6_REASSEMBLY_NEXT_DROP;
- }
- else
- {
- vnet_buffer_opaque_t *fvnb = vnet_buffer (b0);
- next0 = fvnb->ip.reass.error_next_index;
- }
- 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 (next0 == IP6_REASSEMBLY_NEXT_HANDOFF)
- {
- if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
- {
- if (is_feature)
- ip6_reass_add_trace (vm, node, rm, ~0,
- ~0,
- bi0, ~0, ~0, HANDOFF,
- vnet_buffer (b0)->ip.
- reass.owner_feature_thread_index);
- else
- ip6_reass_add_trace (vm, node, rm, ~0, ~0, bi0,
- ~0, ~0, HANDOFF,
- vnet_buffer (b0)->ip.
- reass.owner_thread_index);
- }
- }
- else if (is_feature && IP6_ERROR_NONE == error0)
- {
- b0 = vlib_get_buffer (vm, bi0);
- vnet_feature_next (&next0, b0);
- }
- vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
- n_left_to_next, bi0, next0);
- }
-
- if (~0 != icmp_bi)
- {
- next0 = IP6_REASSEMBLY_NEXT_ICMP_ERROR;
- to_next[0] = icmp_bi;
- to_next += 1;
- n_left_to_next -= 1;
- vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
- n_left_to_next, icmp_bi,
- next0);
- }
- next_packet:
- from += 1;
- n_left_from -= 1;
- }
-
- vlib_put_next_frame (vm, node, next_index, n_left_to_next);
- }
-
- clib_spinlock_unlock (&rt->lock);
- return frame->n_vectors;
-}
-
-static char *ip6_reassembly_error_strings[] = {
-#define _(sym, string) string,
- foreach_ip6_error
-#undef _
-};
-
-VLIB_NODE_FN (ip6_reass_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
- vlib_frame_t * frame)
-{
- return ip6_reassembly_inline (vm, node, frame, false /* is_feature */ ,
- false /* is_custom_app */ );
-}
-
-/* *INDENT-OFF* */
-VLIB_REGISTER_NODE (ip6_reass_node) = {
- .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",
- [IP6_REASSEMBLY_NEXT_HANDOFF] = "ip6-reassembly-handoff",
- },
-};
-/* *INDENT-ON* */
-
-VLIB_NODE_FN (ip6_reass_node_feature) (vlib_main_t * vm,
- vlib_node_runtime_t * node,
- vlib_frame_t * frame)
-{
- return ip6_reassembly_inline (vm, node, frame, true /* is_feature */ ,
- false /* is_custom_app */ );
-}
-
-/* *INDENT-OFF* */
-VLIB_REGISTER_NODE (ip6_reass_node_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",
- [IP6_REASSEMBLY_NEXT_HANDOFF] = "ip6-reass-feature-hoff",
- },
-};
-/* *INDENT-ON* */
-
-/* *INDENT-OFF* */
-VNET_FEATURE_INIT (ip6_reassembly_feature, static) = {
- .arc_name = "ip6-unicast",
- .node_name = "ip6-reassembly-feature",
- .runs_before = VNET_FEATURES ("ip6-lookup",
- "ipsec6-input-feature"),
- .runs_after = 0,
-};
-/* *INDENT-ON* */
-
-#ifndef CLIB_MARCH_VARIANT
-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;
-}
-#endif /* CLIB_MARCH_VARIANT */
-
-typedef enum
-{
- IP6_EVENT_CONFIG_CHANGED = 1,
-} ip6_reass_event_t;
-
-#ifndef CLIB_MARCH_VARIANT
-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 max_reassembly_length, 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.max_reass_len = max_reassembly_length;
- 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 max_reassembly_length, u32 expire_walk_interval_ms)
-{
- u32 old_nbuckets = ip6_reass_get_nbuckets ();
- ip6_reass_set_params (timeout_ms, max_reassemblies, max_reassembly_length,
- 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;
- 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-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_fast (&ip6_reass_main.hash, &new_hash,
- sizeof (ip6_reass_main.hash));
- clib_bihash_copied (&ip6_reass_main.hash, &new_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;
-
- vec_validate (rm->per_thread_data, vlib_num_workers ());
- 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_MAX_REASSEMBLY_LENGTH_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);
-
- rm->fq_index = vlib_frame_queue_main_init (ip6_reass_node.index, 0);
- rm->fq_feature_index =
- vlib_frame_queue_main_init (ip6_reass_node_feature.index, 0);
-
- return error;
-}
-
-VLIB_INIT_FUNCTION (ip6_reass_init_function);
-#endif /* CLIB_MARCH_VARIANT */
-
-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;
- int *pool_indexes_to_free = NULL;
-
- uword thread_index = 0;
- int index;
- const uword nthreads = vlib_num_workers () + 1;
- 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;
- ip6_reass_on_timeout (vm, node, rm, reass, &icmp_bi);
- if (~0 != icmp_bi)
- vec_add1 (vec_icmp_bi, icmp_bi);
-
- ip6_reass_free (rm, rt, reass);
- }
- /* *INDENT-ON* */
-
- clib_spinlock_unlock (&rt->lock);
- }
-
- 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;
- b->error = node->errors[IP6_ERROR_REASS_TIMEOUT];
- 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_len (event_data) = 0;
- }
- }
-
- return 0;
-}
-
-/* *INDENT-OFF* */
-VLIB_REGISTER_NODE (ip6_reass_expire_node) = {
- .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 (b),
- ip6_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_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 = vlib_num_workers () + 1;
- 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;
- 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* */
-
-#ifndef CLIB_MARCH_VARIANT
-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);
-}
-#endif /* CLIB_MARCH_VARIANT */
-
-#define foreach_ip6_reassembly_handoff_error \
-_(CONGESTION_DROP, "congestion drop")
-
-
-typedef enum
-{
-#define _(sym,str) IP6_REASSEMBLY_HANDOFF_ERROR_##sym,
- foreach_ip6_reassembly_handoff_error
-#undef _
- IP6_REASSEMBLY_HANDOFF_N_ERROR,
-} ip6_reassembly_handoff_error_t;
-
-static char *ip6_reassembly_handoff_error_strings[] = {
-#define _(sym,string) string,
- foreach_ip6_reassembly_handoff_error
-#undef _
-};
-
-typedef struct
-{
- u32 next_worker_index;
-} ip6_reassembly_handoff_trace_t;
-
-static u8 *
-format_ip6_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_reassembly_handoff_trace_t *t =
- va_arg (*args, ip6_reassembly_handoff_trace_t *);
-
- s =
- format (s, "ip6-reassembly-handoff: next-worker %d",
- t->next_worker_index);
-
- return s;
-}
-
-always_inline uword
-ip6_reassembly_handoff_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
- vlib_frame_t * frame, bool is_feature)
-{
- ip6_reass_main_t *rm = &ip6_reass_main;
-
- vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
- u32 n_enq, n_left_from, *from;
- u16 thread_indices[VLIB_FRAME_SIZE], *ti;
- u32 fq_index;
-
- from = vlib_frame_vector_args (frame);
- n_left_from = frame->n_vectors;
- vlib_get_buffers (vm, from, bufs, n_left_from);
-
- b = bufs;
- ti = thread_indices;
-
- fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
-
- while (n_left_from > 0)
- {
- ti[0] =
- (is_feature) ? vnet_buffer (b[0])->ip.
- reass.owner_feature_thread_index : 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_reassembly_handoff_trace_t *t =
- vlib_add_trace (vm, node, b[0], sizeof (*t));
- t->next_worker_index = ti[0];
- }
-
- n_left_from -= 1;
- ti += 1;
- b += 1;
- }
- n_enq =
- vlib_buffer_enqueue_to_thread (vm, fq_index, from, thread_indices,
- frame->n_vectors, 1);
-
- if (n_enq < frame->n_vectors)
- vlib_node_increment_counter (vm, node->node_index,
- IP6_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
- frame->n_vectors - n_enq);
- return frame->n_vectors;
-}
-
-VLIB_NODE_FN (ip6_reassembly_handoff_node) (vlib_main_t * vm,
- vlib_node_runtime_t * node,
- vlib_frame_t * frame)
-{
- return ip6_reassembly_handoff_inline (vm, node, frame,
- false /* is_feature */ );
-}
-
-/* *INDENT-OFF* */
-VLIB_REGISTER_NODE (ip6_reassembly_handoff_node) = {
- .name = "ip6-reassembly-handoff",
- .vector_size = sizeof (u32),
- .n_errors = ARRAY_LEN(ip6_reassembly_handoff_error_strings),
- .error_strings = ip6_reassembly_handoff_error_strings,
- .format_trace = format_ip6_reassembly_handoff_trace,
-
- .n_next_nodes = 1,
-
- .next_nodes = {
- [0] = "error-drop",
- },
-};
-
-
-VLIB_NODE_FN (ip6_reassembly_feature_handoff_node) (vlib_main_t * vm,
- vlib_node_runtime_t * node, vlib_frame_t * frame)
-{
- return ip6_reassembly_handoff_inline (vm, node, frame, true /* is_feature */ );
-}
-
-
-/* *INDENT-OFF* */
-VLIB_REGISTER_NODE (ip6_reassembly_feature_handoff_node) = {
- .name = "ip6-reass-feature-hoff",
- .vector_size = sizeof (u32),
- .n_errors = ARRAY_LEN(ip6_reassembly_handoff_error_strings),
- .error_strings = ip6_reassembly_handoff_error_strings,
- .format_trace = format_ip6_reassembly_handoff_trace,
-
- .n_next_nodes = 1,
-
- .next_nodes = {
- [0] = "error-drop",
- },
-};
-/* *INDENT-ON* */
-
-/*
- * fd.io coding-style-patch-verification: ON
- *
- * Local Variables:
- * eval: (c-set-style "gnu")
- * End:
- */