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authorKlement Sekera <ksekera@cisco.com>2019-06-25 11:19:22 +0000
committerOle Trøan <otroan@employees.org>2019-09-26 14:12:07 +0000
commitde34c35fc73226943538149fae9dbc5cfbdc6e75 (patch)
treeab354210305403bc29a3effc7c002f947422cb9f /src/vnet/ip/reass/ip4_sv_reass.c
parent33538a15087eea7c994b6f3d8a952c4b6ea98ee4 (diff)
ip: add shallow virtual reassembly functionality
Type: feature Change-Id: Ibc8334e26c7e6f6120696c3e313b6e11d73dab99 Signed-off-by: Klement Sekera <ksekera@cisco.com>
Diffstat (limited to 'src/vnet/ip/reass/ip4_sv_reass.c')
-rw-r--r--src/vnet/ip/reass/ip4_sv_reass.c1199
1 files changed, 1199 insertions, 0 deletions
diff --git a/src/vnet/ip/reass/ip4_sv_reass.c b/src/vnet/ip/reass/ip4_sv_reass.c
new file mode 100644
index 00000000000..25119e8d0a7
--- /dev/null
+++ b/src/vnet/ip/reass/ip4_sv_reass.c
@@ -0,0 +1,1199 @@
+/*
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @file
+ * @brief IPv4 Shallow Virtual Reassembly.
+ *
+ * This file contains the source code for IPv4 Shallow Virtual reassembly.
+ */
+
+#include <vppinfra/vec.h>
+#include <vnet/vnet.h>
+#include <vnet/ip/ip.h>
+#include <vnet/ip/ip4_to_ip6.h>
+#include <vppinfra/fifo.h>
+#include <vppinfra/bihash_16_8.h>
+#include <vnet/ip/reass/ip4_sv_reass.h>
+
+#define MSEC_PER_SEC 1000
+#define IP4_SV_REASS_TIMEOUT_DEFAULT_MS 100
+#define IP4_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000 // 10 seconds default
+#define IP4_SV_REASS_MAX_REASSEMBLIES_DEFAULT 1024
+#define IP4_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3
+#define IP4_SV_REASS_HT_LOAD_FACTOR (0.75)
+
+typedef enum
+{
+ IP4_SV_REASS_RC_OK,
+ IP4_SV_REASS_RC_TOO_MANY_FRAGMENTS,
+ IP4_SV_REASS_RC_UNSUPP_IP_PROTO,
+} ip4_sv_reass_rc_t;
+
+typedef struct
+{
+ union
+ {
+ struct
+ {
+ u32 xx_id;
+ ip4_address_t src;
+ ip4_address_t dst;
+ u16 frag_id;
+ u8 proto;
+ u8 unused;
+ };
+ u64 as_u64[2];
+ };
+} ip4_sv_reass_key_t;
+
+typedef union
+{
+ struct
+ {
+ u32 reass_index;
+ u32 thread_index;
+ };
+ u64 as_u64;
+} ip4_sv_reass_val_t;
+
+typedef union
+{
+ struct
+ {
+ ip4_sv_reass_key_t k;
+ ip4_sv_reass_val_t v;
+ };
+ clib_bihash_kv_16_8_t kv;
+} ip4_sv_reass_kv_t;
+
+typedef struct
+{
+ // hash table key
+ ip4_sv_reass_key_t key;
+ // time when last packet was received
+ f64 last_heard;
+ // internal id of this reassembly
+ u64 id;
+ // trace operation counter
+ u32 trace_op_counter;
+ // minimum fragment length for this reassembly - used to estimate MTU
+ u16 min_fragment_length;
+ // buffer indexes of buffers in this reassembly in chronological order -
+ // including overlaps and duplicate fragments
+ u32 *cached_buffers;
+ // set to true when this reassembly is completed
+ bool is_complete;
+ // ip protocol
+ u8 ip_proto;
+ // l4 src port
+ u16 l4_src_port;
+ // l4 dst port
+ u16 l4_dst_port;
+ u32 next_index;
+ // lru indexes
+ u32 lru_prev;
+ u32 lru_next;
+} ip4_sv_reass_t;
+
+typedef struct
+{
+ ip4_sv_reass_t *pool;
+ u32 reass_n;
+ u32 id_counter;
+ clib_spinlock_t lock;
+ // lru indexes
+ u32 lru_first;
+ u32 lru_last;
+
+} ip4_sv_reass_per_thread_t;
+
+typedef struct
+{
+ // IPv4 config
+ u32 timeout_ms;
+ f64 timeout;
+ u32 expire_walk_interval_ms;
+ // maximum number of fragments in one reassembly
+ u32 max_reass_len;
+ // maximum number of reassemblies
+ u32 max_reass_n;
+
+ // IPv4 runtime
+ clib_bihash_16_8_t hash;
+ // per-thread data
+ ip4_sv_reass_per_thread_t *per_thread_data;
+
+ // convenience
+ vlib_main_t *vlib_main;
+ vnet_main_t *vnet_main;
+
+ // node index of ip4-drop node
+ u32 ip4_drop_idx;
+ u32 ip4_sv_reass_expire_node_idx;
+
+ /** Worker handoff */
+ u32 fq_index;
+ u32 fq_feature_index;
+
+ // reference count for enabling/disabling feature
+ u32 feature_use_refcount;
+
+} ip4_sv_reass_main_t;
+
+extern ip4_sv_reass_main_t ip4_sv_reass_main;
+
+#ifndef CLIB_MARCH_VARIANT
+ip4_sv_reass_main_t ip4_sv_reass_main;
+#endif /* CLIB_MARCH_VARIANT */
+
+typedef enum
+{
+ IP4_SV_REASSEMBLY_NEXT_INPUT,
+ IP4_SV_REASSEMBLY_NEXT_DROP,
+ IP4_SV_REASSEMBLY_NEXT_HANDOFF,
+ IP4_SV_REASSEMBLY_N_NEXT,
+} ip4_sv_reass_next_t;
+
+typedef enum
+{
+ REASS_FRAGMENT_CACHE,
+ REASS_FINISH,
+ REASS_FRAGMENT_FORWARD,
+} ip4_sv_reass_trace_operation_e;
+
+typedef struct
+{
+ ip4_sv_reass_trace_operation_e action;
+ u32 reass_id;
+ u32 op_id;
+ u8 ip_proto;
+ u16 l4_src_port;
+ u16 l4_dst_port;
+} ip4_sv_reass_trace_t;
+
+extern vlib_node_registration_t ip4_sv_reass_node;
+extern vlib_node_registration_t ip4_sv_reass_node_feature;
+
+static u8 *
+format_ip4_sv_reass_trace (u8 * s, va_list * args)
+{
+ CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
+ CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
+ ip4_sv_reass_trace_t *t = va_arg (*args, ip4_sv_reass_trace_t *);
+ s = format (s, "reass id: %u, op id: %u ", t->reass_id, t->op_id);
+ switch (t->action)
+ {
+ case REASS_FRAGMENT_CACHE:
+ s = format (s, "[cached]");
+ break;
+ case REASS_FINISH:
+ s =
+ format (s, "[finish, ip proto=%u, src_port=%u, dst_port=%u]",
+ t->ip_proto, clib_net_to_host_u16 (t->l4_src_port),
+ clib_net_to_host_u16 (t->l4_dst_port));
+ break;
+ case REASS_FRAGMENT_FORWARD:
+ s =
+ format (s, "[forward, ip proto=%u, src_port=%u, dst_port=%u]",
+ t->ip_proto, clib_net_to_host_u16 (t->l4_src_port),
+ clib_net_to_host_u16 (t->l4_dst_port));
+ break;
+ }
+ return s;
+}
+
+static void
+ip4_sv_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
+ ip4_sv_reass_main_t * rm, ip4_sv_reass_t * reass,
+ u32 bi, ip4_sv_reass_trace_operation_e action,
+ u32 ip_proto, u16 l4_src_port, u16 l4_dst_port)
+{
+ vlib_buffer_t *b = vlib_get_buffer (vm, bi);
+ ip4_sv_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
+ t->reass_id = reass->id;
+ t->action = action;
+ t->op_id = reass->trace_op_counter;
+ t->ip_proto = ip_proto;
+ t->l4_src_port = l4_src_port;
+ t->l4_dst_port = l4_dst_port;
+ ++reass->trace_op_counter;
+#if 0
+ static u8 *s = NULL;
+ s = format (s, "%U", format_ip4_sv_reass_trace, NULL, NULL, t);
+ printf ("%.*s\n", vec_len (s), s);
+ fflush (stdout);
+ vec_reset_length (s);
+#endif
+}
+
+
+always_inline void
+ip4_sv_reass_free (vlib_main_t * vm, ip4_sv_reass_main_t * rm,
+ ip4_sv_reass_per_thread_t * rt, ip4_sv_reass_t * reass)
+{
+ clib_bihash_kv_16_8_t kv;
+ kv.key[0] = reass->key.as_u64[0];
+ kv.key[1] = reass->key.as_u64[1];
+ clib_bihash_add_del_16_8 (&rm->hash, &kv, 0);
+ vlib_buffer_free (vm, reass->cached_buffers,
+ vec_len (reass->cached_buffers));
+ vec_free (reass->cached_buffers);
+ reass->cached_buffers = NULL;
+ if (~0 != reass->lru_prev)
+ {
+ ip4_sv_reass_t *lru_prev =
+ pool_elt_at_index (rt->pool, reass->lru_prev);
+ lru_prev->lru_next = reass->lru_next;
+ }
+ if (~0 != reass->lru_next)
+ {
+ ip4_sv_reass_t *lru_next =
+ pool_elt_at_index (rt->pool, reass->lru_next);
+ lru_next->lru_prev = reass->lru_prev;
+ }
+ if (rt->lru_first == reass - rt->pool)
+ {
+ rt->lru_first = reass->lru_next;
+ }
+ if (rt->lru_last == reass - rt->pool)
+ {
+ rt->lru_last = reass->lru_prev;
+ }
+ pool_put (rt->pool, reass);
+ --rt->reass_n;
+}
+
+always_inline void
+ip4_sv_reass_init (ip4_sv_reass_t * reass)
+{
+ reass->cached_buffers = NULL;
+ reass->is_complete = false;
+}
+
+always_inline ip4_sv_reass_t *
+ip4_sv_reass_find_or_create (vlib_main_t * vm, ip4_sv_reass_main_t * rm,
+ ip4_sv_reass_per_thread_t * rt,
+ ip4_sv_reass_kv_t * kv, u8 * do_handoff)
+{
+ ip4_sv_reass_t *reass = NULL;
+ f64 now = vlib_time_now (rm->vlib_main);
+
+ if (!clib_bihash_search_16_8
+ (&rm->hash, (clib_bihash_kv_16_8_t *) kv, (clib_bihash_kv_16_8_t *) kv))
+ {
+ if (vm->thread_index != kv->v.thread_index)
+ {
+ *do_handoff = 1;
+ return NULL;
+ }
+ reass = pool_elt_at_index (rt->pool, kv->v.reass_index);
+
+ if (now > reass->last_heard + rm->timeout)
+ {
+ ip4_sv_reass_free (vm, rm, rt, reass);
+ reass = NULL;
+ }
+ }
+
+ if (reass)
+ {
+ reass->last_heard = now;
+ return reass;
+ }
+
+ if (rt->reass_n >= rm->max_reass_n && rm->max_reass_n)
+ {
+ reass = pool_elt_at_index (rt->pool, rt->lru_last);
+ ip4_sv_reass_free (vm, rm, rt, reass);
+ }
+
+ pool_get (rt->pool, reass);
+ clib_memset (reass, 0, sizeof (*reass));
+ reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter;
+ ++rt->id_counter;
+ ip4_sv_reass_init (reass);
+ ++rt->reass_n;
+ reass->lru_prev = reass->lru_next = ~0;
+
+ if (~0 != rt->lru_last)
+ {
+ ip4_sv_reass_t *lru_last = pool_elt_at_index (rt->pool, rt->lru_last);
+ reass->lru_prev = rt->lru_last;
+ lru_last->lru_next = rt->lru_last = reass - rt->pool;
+ }
+
+ if (~0 == rt->lru_first)
+ {
+ rt->lru_first = rt->lru_last = reass - rt->pool;
+ }
+
+ reass->key.as_u64[0] = ((clib_bihash_kv_16_8_t *) kv)->key[0];
+ reass->key.as_u64[1] = ((clib_bihash_kv_16_8_t *) kv)->key[1];
+ kv->v.reass_index = (reass - rt->pool);
+ kv->v.thread_index = vm->thread_index;
+ reass->last_heard = now;
+
+ if (clib_bihash_add_del_16_8 (&rm->hash, (clib_bihash_kv_16_8_t *) kv, 1))
+ {
+ ip4_sv_reass_free (vm, rm, rt, reass);
+ reass = NULL;
+ }
+
+ return reass;
+}
+
+always_inline ip4_sv_reass_rc_t
+ip4_sv_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
+ ip4_sv_reass_main_t * rm, ip4_sv_reass_per_thread_t * rt,
+ ip4_sv_reass_t * reass, u32 bi0)
+{
+ vlib_buffer_t *fb = vlib_get_buffer (vm, bi0);
+ ip4_sv_reass_rc_t rc = IP4_SV_REASS_RC_OK;
+ ip4_header_t *fip = vlib_buffer_get_current (fb);
+ const u32 fragment_first = ip4_get_fragment_offset_bytes (fip);
+ if (0 == fragment_first)
+ {
+ reass->ip_proto = fip->protocol;
+ reass->l4_src_port = ip4_get_port (fip, 1);
+ reass->l4_dst_port = ip4_get_port (fip, 0);
+ if (!reass->l4_src_port || !reass->l4_dst_port)
+ return IP4_SV_REASS_RC_UNSUPP_IP_PROTO;
+ reass->is_complete = true;
+ vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
+ if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ ip4_sv_reass_add_trace (vm, node, rm, reass, bi0, REASS_FINISH,
+ reass->ip_proto, reass->l4_src_port,
+ reass->l4_dst_port);
+ }
+ }
+ vec_add1 (reass->cached_buffers, bi0);
+ if (!reass->is_complete)
+ {
+ if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ ip4_sv_reass_add_trace (vm, node, rm, reass, bi0,
+ REASS_FRAGMENT_CACHE, ~0, ~0, ~0);
+ }
+ if (vec_len (reass->cached_buffers) > rm->max_reass_len)
+ {
+ rc = IP4_SV_REASS_RC_TOO_MANY_FRAGMENTS;
+ }
+ }
+ return rc;
+}
+
+always_inline uword
+ip4_sv_reass_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
+ vlib_frame_t * frame, bool is_feature, bool is_custom)
+{
+ u32 *from = vlib_frame_vector_args (frame);
+ u32 n_left_from, n_left_to_next, *to_next, next_index;
+ ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
+ ip4_sv_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index];
+ clib_spinlock_lock (&rt->lock);
+
+ n_left_from = frame->n_vectors;
+ next_index = node->cached_next_index;
+
+ while (n_left_from > 0)
+ {
+ vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+
+ while (n_left_from > 0 && n_left_to_next > 0)
+ {
+ u32 bi0;
+ vlib_buffer_t *b0;
+ u32 next0;
+ u32 error0 = IP4_ERROR_NONE;
+
+ bi0 = from[0];
+ b0 = vlib_get_buffer (vm, bi0);
+
+ ip4_header_t *ip0 = vlib_buffer_get_current (b0);
+ if (!ip4_get_fragment_more (ip0) && !ip4_get_fragment_offset (ip0))
+ {
+ // this is a regular packet - no fragmentation
+ vnet_buffer (b0)->ip.reass.ip_proto = ip0->protocol;
+ vnet_buffer (b0)->ip.reass.l4_src_port = ip4_get_port (ip0, 1);
+ vnet_buffer (b0)->ip.reass.l4_dst_port = ip4_get_port (ip0, 0);
+ next0 = IP4_SV_REASSEMBLY_NEXT_INPUT;
+ goto packet_enqueue;
+ }
+ const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0);
+ const u32 fragment_length =
+ clib_net_to_host_u16 (ip0->length) - ip4_header_bytes (ip0);
+ const u32 fragment_last = fragment_first + fragment_length - 1;
+ if (fragment_first > fragment_last || fragment_first + fragment_length > UINT16_MAX - 20 || (fragment_length < 8 && ip4_get_fragment_more (ip0))) // 8 is minimum frag length per RFC 791
+ {
+ next0 = IP4_SV_REASSEMBLY_NEXT_DROP;
+ error0 = IP4_ERROR_REASS_MALFORMED_PACKET;
+ goto packet_enqueue;
+ }
+ ip4_sv_reass_kv_t kv;
+ u8 do_handoff = 0;
+
+ kv.k.as_u64[0] =
+ (u64) vec_elt (ip4_main.fib_index_by_sw_if_index,
+ vnet_buffer (b0)->sw_if_index[VLIB_RX]) |
+ (u64) ip0->src_address.as_u32 << 32;
+ kv.k.as_u64[1] =
+ (u64) ip0->dst_address.
+ as_u32 | (u64) ip0->fragment_id << 32 | (u64) ip0->protocol << 48;
+
+ ip4_sv_reass_t *reass =
+ ip4_sv_reass_find_or_create (vm, rm, rt, &kv, &do_handoff);
+
+ if (PREDICT_FALSE (do_handoff))
+ {
+ next0 = IP4_SV_REASSEMBLY_NEXT_HANDOFF;
+ vnet_buffer (b0)->ip.reass.owner_thread_index =
+ kv.v.thread_index;
+ goto packet_enqueue;
+ }
+
+ if (!reass)
+ {
+ next0 = IP4_SV_REASSEMBLY_NEXT_DROP;
+ error0 = IP4_ERROR_REASS_LIMIT_REACHED;
+ goto packet_enqueue;
+ }
+
+ if (reass->is_complete)
+ {
+ vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
+ vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
+ vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
+ next0 = IP4_SV_REASSEMBLY_NEXT_INPUT;
+ error0 = IP4_ERROR_NONE;
+ if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ ip4_sv_reass_add_trace (vm, node, rm, reass, bi0,
+ REASS_FRAGMENT_FORWARD,
+ reass->ip_proto,
+ reass->l4_src_port,
+ reass->l4_dst_port);
+ }
+ goto packet_enqueue;
+ }
+
+ ip4_sv_reass_rc_t rc =
+ ip4_sv_reass_update (vm, node, rm, rt, reass, bi0);
+ switch (rc)
+ {
+ case IP4_SV_REASS_RC_OK:
+ /* nothing to do here */
+ break;
+ case IP4_SV_REASS_RC_TOO_MANY_FRAGMENTS:
+ vlib_node_increment_counter (vm, node->node_index,
+ IP4_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
+ 1);
+ ip4_sv_reass_free (vm, rm, rt, reass);
+ goto next_packet;
+ break;
+ case IP4_SV_REASS_RC_UNSUPP_IP_PROTO:
+ vlib_node_increment_counter (vm, node->node_index,
+ IP4_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG,
+ 1);
+ ip4_sv_reass_free (vm, rm, rt, reass);
+ goto next_packet;
+ break;
+ }
+ if (reass->is_complete)
+ {
+ u32 idx;
+ vec_foreach_index (idx, reass->cached_buffers)
+ {
+ u32 bi0 = vec_elt (reass->cached_buffers, idx);
+ vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
+ u32 next0 = IP4_SV_REASSEMBLY_NEXT_INPUT;
+ if (is_feature)
+ {
+ vnet_feature_next (&next0, b0);
+ }
+ if (is_custom)
+ {
+ next0 = vnet_buffer (b0)->ip.reass.next_index;
+ }
+ if (0 == n_left_to_next)
+ {
+ vlib_put_next_frame (vm, node, next_index,
+ n_left_to_next);
+ vlib_get_next_frame (vm, node, next_index, to_next,
+ n_left_to_next);
+ }
+ to_next[0] = bi0;
+ to_next += 1;
+ n_left_to_next -= 1;
+ vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto;
+ vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port;
+ vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port;
+ if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ ip4_sv_reass_add_trace (vm, node, rm, reass, bi0,
+ REASS_FRAGMENT_FORWARD,
+ reass->ip_proto,
+ reass->l4_src_port,
+ reass->l4_dst_port);
+ }
+ vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
+ to_next, n_left_to_next, bi0,
+ next0);
+ }
+ _vec_len (reass->cached_buffers) = 0; // buffers are owned by frame now
+ }
+ goto next_packet;
+
+ packet_enqueue:
+ b0->error = node->errors[error0];
+
+ to_next[0] = bi0;
+ to_next += 1;
+ n_left_to_next -= 1;
+ if (is_feature && IP4_ERROR_NONE == error0)
+ {
+ b0 = vlib_get_buffer (vm, bi0);
+ vnet_feature_next (&next0, b0);
+ }
+ if (is_custom)
+ {
+ next0 = vnet_buffer (b0)->ip.reass.next_index;
+ }
+ vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, 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 *ip4_sv_reass_error_strings[] = {
+#define _(sym, string) string,
+ foreach_ip4_error
+#undef _
+};
+
+VLIB_NODE_FN (ip4_sv_reass_node) (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ return ip4_sv_reass_inline (vm, node, frame, false /* is_feature */ ,
+ false /* is_custom */ );
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (ip4_sv_reass_node) = {
+ .name = "ip4-sv-reassembly",
+ .vector_size = sizeof (u32),
+ .format_trace = format_ip4_sv_reass_trace,
+ .n_errors = ARRAY_LEN (ip4_sv_reass_error_strings),
+ .error_strings = ip4_sv_reass_error_strings,
+ .n_next_nodes = IP4_SV_REASSEMBLY_N_NEXT,
+ .next_nodes =
+ {
+ [IP4_SV_REASSEMBLY_NEXT_INPUT] = "ip4-input",
+ [IP4_SV_REASSEMBLY_NEXT_DROP] = "ip4-drop",
+ [IP4_SV_REASSEMBLY_NEXT_HANDOFF] = "ip4-sv-reassembly-handoff",
+
+ },
+};
+/* *INDENT-ON* */
+
+VLIB_NODE_FN (ip4_sv_reass_node_feature) (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ return ip4_sv_reass_inline (vm, node, frame, true /* is_feature */ ,
+ false /* is_custom */ );
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (ip4_sv_reass_node_feature) = {
+ .name = "ip4-sv-reassembly-feature",
+ .vector_size = sizeof (u32),
+ .format_trace = format_ip4_sv_reass_trace,
+ .n_errors = ARRAY_LEN (ip4_sv_reass_error_strings),
+ .error_strings = ip4_sv_reass_error_strings,
+ .n_next_nodes = IP4_SV_REASSEMBLY_N_NEXT,
+ .next_nodes =
+ {
+ [IP4_SV_REASSEMBLY_NEXT_INPUT] = "ip4-input",
+ [IP4_SV_REASSEMBLY_NEXT_DROP] = "ip4-drop",
+ [IP4_SV_REASSEMBLY_NEXT_HANDOFF] = "ip4-sv-reass-feature-hoff",
+ },
+};
+/* *INDENT-ON* */
+
+/* *INDENT-OFF* */
+VNET_FEATURE_INIT (ip4_sv_reass_feature) = {
+ .arc_name = "ip4-unicast",
+ .node_name = "ip4-sv-reassembly-feature",
+ .runs_before = VNET_FEATURES ("ip4-lookup"),
+ .runs_after = 0,
+};
+/* *INDENT-ON* */
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (ip4_sv_reass_custom_node) = {
+ .name = "ip4-sv-reassembly-custom-next",
+ .vector_size = sizeof (u32),
+ .format_trace = format_ip4_sv_reass_trace,
+ .n_errors = ARRAY_LEN (ip4_sv_reass_error_strings),
+ .error_strings = ip4_sv_reass_error_strings,
+ .n_next_nodes = IP4_SV_REASSEMBLY_N_NEXT,
+ .next_nodes =
+ {
+ [IP4_SV_REASSEMBLY_NEXT_INPUT] = "ip4-input",
+ [IP4_SV_REASSEMBLY_NEXT_DROP] = "ip4-drop",
+ [IP4_SV_REASSEMBLY_NEXT_HANDOFF] = "ip4-sv-reassembly-handoff",
+
+ },
+};
+/* *INDENT-ON* */
+
+VLIB_NODE_FN (ip4_sv_reass_custom_node) (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ return ip4_sv_reass_inline (vm, node, frame, false /* is_feature */ ,
+ true /* is_custom */ );
+}
+
+#ifndef CLIB_MARCH_VARIANT
+always_inline u32
+ip4_sv_reass_get_nbuckets ()
+{
+ ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
+ u32 nbuckets;
+ u8 i;
+
+ nbuckets = (u32) (rm->max_reass_n / IP4_SV_REASS_HT_LOAD_FACTOR);
+
+ for (i = 0; i < 31; i++)
+ if ((1 << i) >= nbuckets)
+ break;
+ nbuckets = 1 << i;
+
+ return nbuckets;
+}
+#endif /* CLIB_MARCH_VARIANT */
+
+typedef enum
+{
+ IP4_EVENT_CONFIG_CHANGED = 1,
+} ip4_sv_reass_event_t;
+
+typedef struct
+{
+ int failure;
+ clib_bihash_16_8_t *new_hash;
+} ip4_rehash_cb_ctx;
+
+#ifndef CLIB_MARCH_VARIANT
+static void
+ip4_rehash_cb (clib_bihash_kv_16_8_t * kv, void *_ctx)
+{
+ ip4_rehash_cb_ctx *ctx = _ctx;
+ if (clib_bihash_add_del_16_8 (ctx->new_hash, kv, 1))
+ {
+ ctx->failure = 1;
+ }
+}
+
+static void
+ip4_sv_reass_set_params (u32 timeout_ms, u32 max_reassemblies,
+ u32 max_reassembly_length,
+ u32 expire_walk_interval_ms)
+{
+ ip4_sv_reass_main.timeout_ms = timeout_ms;
+ ip4_sv_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
+ ip4_sv_reass_main.max_reass_n = max_reassemblies;
+ ip4_sv_reass_main.max_reass_len = max_reassembly_length;
+ ip4_sv_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
+}
+
+vnet_api_error_t
+ip4_sv_reass_set (u32 timeout_ms, u32 max_reassemblies,
+ u32 max_reassembly_length, u32 expire_walk_interval_ms)
+{
+ u32 old_nbuckets = ip4_sv_reass_get_nbuckets ();
+ ip4_sv_reass_set_params (timeout_ms, max_reassemblies,
+ max_reassembly_length, expire_walk_interval_ms);
+ vlib_process_signal_event (ip4_sv_reass_main.vlib_main,
+ ip4_sv_reass_main.ip4_sv_reass_expire_node_idx,
+ IP4_EVENT_CONFIG_CHANGED, 0);
+ u32 new_nbuckets = ip4_sv_reass_get_nbuckets ();
+ if (ip4_sv_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets)
+ {
+ clib_bihash_16_8_t new_hash;
+ clib_memset (&new_hash, 0, sizeof (new_hash));
+ ip4_rehash_cb_ctx ctx;
+ ctx.failure = 0;
+ ctx.new_hash = &new_hash;
+ clib_bihash_init_16_8 (&new_hash, "ip4-dr", new_nbuckets,
+ new_nbuckets * 1024);
+ clib_bihash_foreach_key_value_pair_16_8 (&ip4_sv_reass_main.hash,
+ ip4_rehash_cb, &ctx);
+ if (ctx.failure)
+ {
+ clib_bihash_free_16_8 (&new_hash);
+ return -1;
+ }
+ else
+ {
+ clib_bihash_free_16_8 (&ip4_sv_reass_main.hash);
+ clib_memcpy_fast (&ip4_sv_reass_main.hash, &new_hash,
+ sizeof (ip4_sv_reass_main.hash));
+ clib_bihash_copied (&ip4_sv_reass_main.hash, &new_hash);
+ }
+ }
+ return 0;
+}
+
+vnet_api_error_t
+ip4_sv_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
+ u32 * max_reassembly_length, u32 * expire_walk_interval_ms)
+{
+ *timeout_ms = ip4_sv_reass_main.timeout_ms;
+ *max_reassemblies = ip4_sv_reass_main.max_reass_n;
+ *max_reassembly_length = ip4_sv_reass_main.max_reass_len;
+ *expire_walk_interval_ms = ip4_sv_reass_main.expire_walk_interval_ms;
+ return 0;
+}
+
+static clib_error_t *
+ip4_sv_reass_init_function (vlib_main_t * vm)
+{
+ ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
+ clib_error_t *error = 0;
+ u32 nbuckets;
+ vlib_node_t *node;
+
+ rm->vlib_main = vm;
+ rm->vnet_main = vnet_get_main ();
+
+ vec_validate (rm->per_thread_data, vlib_num_workers ());
+ ip4_sv_reass_per_thread_t *rt;
+ vec_foreach (rt, rm->per_thread_data)
+ {
+ clib_spinlock_init (&rt->lock);
+ pool_alloc (rt->pool, rm->max_reass_n);
+ rt->lru_first = rt->lru_last = ~0;
+ }
+
+ node = vlib_get_node_by_name (vm, (u8 *) "ip4-sv-reassembly-expire-walk");
+ ASSERT (node);
+ rm->ip4_sv_reass_expire_node_idx = node->index;
+
+ ip4_sv_reass_set_params (IP4_SV_REASS_TIMEOUT_DEFAULT_MS,
+ IP4_SV_REASS_MAX_REASSEMBLIES_DEFAULT,
+ IP4_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT,
+ IP4_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
+
+ nbuckets = ip4_sv_reass_get_nbuckets ();
+ clib_bihash_init_16_8 (&rm->hash, "ip4-dr", nbuckets, nbuckets * 1024);
+
+ node = vlib_get_node_by_name (vm, (u8 *) "ip4-drop");
+ ASSERT (node);
+ rm->ip4_drop_idx = node->index;
+
+ rm->fq_index = vlib_frame_queue_main_init (ip4_sv_reass_node.index, 0);
+ rm->fq_feature_index =
+ vlib_frame_queue_main_init (ip4_sv_reass_node_feature.index, 0);
+
+ return error;
+}
+
+VLIB_INIT_FUNCTION (ip4_sv_reass_init_function);
+#endif /* CLIB_MARCH_VARIANT */
+
+static uword
+ip4_sv_reass_walk_expired (vlib_main_t * vm,
+ vlib_node_runtime_t * node, vlib_frame_t * f)
+{
+ ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
+ uword event_type, *event_data = 0;
+
+ while (true)
+ {
+ vlib_process_wait_for_event_or_clock (vm,
+ (f64)
+ rm->expire_walk_interval_ms /
+ (f64) MSEC_PER_SEC);
+ event_type = vlib_process_get_events (vm, &event_data);
+
+ switch (event_type)
+ {
+ case ~0: /* no events => timeout */
+ /* nothing to do here */
+ break;
+ case IP4_EVENT_CONFIG_CHANGED:
+ break;
+ default:
+ clib_warning ("BUG: event type 0x%wx", event_type);
+ break;
+ }
+ f64 now = vlib_time_now (vm);
+
+ ip4_sv_reass_t *reass;
+ int *pool_indexes_to_free = NULL;
+
+ uword thread_index = 0;
+ int index;
+ const uword nthreads = vlib_num_workers () + 1;
+ for (thread_index = 0; thread_index < nthreads; ++thread_index)
+ {
+ ip4_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
+ clib_spinlock_lock (&rt->lock);
+
+ vec_reset_length (pool_indexes_to_free);
+ /* *INDENT-OFF* */
+ pool_foreach_index (index, rt->pool, ({
+ reass = pool_elt_at_index (rt->pool, index);
+ if (now > reass->last_heard + rm->timeout)
+ {
+ vec_add1 (pool_indexes_to_free, index);
+ }
+ }));
+ /* *INDENT-ON* */
+ int *i;
+ /* *INDENT-OFF* */
+ vec_foreach (i, pool_indexes_to_free)
+ {
+ ip4_sv_reass_t *reass = pool_elt_at_index (rt->pool, i[0]);
+ ip4_sv_reass_free (vm, rm, rt, reass);
+ }
+ /* *INDENT-ON* */
+
+ clib_spinlock_unlock (&rt->lock);
+ }
+
+ vec_free (pool_indexes_to_free);
+ if (event_data)
+ {
+ _vec_len (event_data) = 0;
+ }
+ }
+
+ return 0;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (ip4_sv_reass_expire_node) = {
+ .function = ip4_sv_reass_walk_expired,
+ .type = VLIB_NODE_TYPE_PROCESS,
+ .name = "ip4-sv-reassembly-expire-walk",
+ .format_trace = format_ip4_sv_reass_trace,
+ .n_errors = ARRAY_LEN (ip4_sv_reass_error_strings),
+ .error_strings = ip4_sv_reass_error_strings,
+
+};
+/* *INDENT-ON* */
+
+static u8 *
+format_ip4_sv_reass_key (u8 * s, va_list * args)
+{
+ ip4_sv_reass_key_t *key = va_arg (*args, ip4_sv_reass_key_t *);
+ s =
+ format (s,
+ "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
+ key->xx_id, format_ip4_address, &key->src, format_ip4_address,
+ &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
+ return s;
+}
+
+static u8 *
+format_ip4_sv_reass (u8 * s, va_list * args)
+{
+ vlib_main_t *vm = va_arg (*args, vlib_main_t *);
+ ip4_sv_reass_t *reass = va_arg (*args, ip4_sv_reass_t *);
+
+ s = format (s, "ID: %lu, key: %U trace_op_counter: %u\n",
+ reass->id, format_ip4_sv_reass_key, &reass->key,
+ reass->trace_op_counter);
+
+ vlib_buffer_t *b;
+ u32 *bip;
+ u32 counter = 0;
+ vec_foreach (bip, reass->cached_buffers)
+ {
+ u32 bi = *bip;
+ do
+ {
+ b = vlib_get_buffer (vm, bi);
+ s = format (s, " #%03u: bi: %u, ", counter, bi);
+ ++counter;
+ bi = b->next_buffer;
+ }
+ while (b->flags & VLIB_BUFFER_NEXT_PRESENT);
+ }
+ return s;
+}
+
+static clib_error_t *
+show_ip4_reass (vlib_main_t * vm,
+ unformat_input_t * input,
+ CLIB_UNUSED (vlib_cli_command_t * lmd))
+{
+ ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
+
+ vlib_cli_output (vm, "---------------------");
+ vlib_cli_output (vm, "IP4 reassembly status");
+ vlib_cli_output (vm, "---------------------");
+ bool details = false;
+ if (unformat (input, "details"))
+ {
+ details = true;
+ }
+
+ u32 sum_reass_n = 0;
+ ip4_sv_reass_t *reass;
+ uword thread_index;
+ const uword nthreads = vlib_num_workers () + 1;
+ for (thread_index = 0; thread_index < nthreads; ++thread_index)
+ {
+ ip4_sv_reass_per_thread_t *rt = &rm->per_thread_data[thread_index];
+ clib_spinlock_lock (&rt->lock);
+ if (details)
+ {
+ /* *INDENT-OFF* */
+ pool_foreach (reass, rt->pool, {
+ vlib_cli_output (vm, "%U", format_ip4_sv_reass, vm, reass);
+ });
+ /* *INDENT-ON* */
+ }
+ sum_reass_n += rt->reass_n;
+ clib_spinlock_unlock (&rt->lock);
+ }
+ vlib_cli_output (vm, "---------------------");
+ vlib_cli_output (vm, "Current IP4 reassemblies count: %lu\n",
+ (long unsigned) sum_reass_n);
+ vlib_cli_output (vm,
+ "Maximum configured concurrent IP4 reassemblies per worker-thread: %lu\n",
+ (long unsigned) rm->max_reass_n);
+ return 0;
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (show_ip4_sv_reass_cmd, static) = {
+ .path = "show ip4-sv-reassembly",
+ .short_help = "show ip4-sv-reassembly [details]",
+ .function = show_ip4_reass,
+};
+/* *INDENT-ON* */
+
+#ifndef CLIB_MARCH_VARIANT
+vnet_api_error_t
+ip4_sv_reass_enable_disable (u32 sw_if_index, u8 enable_disable)
+{
+ return vnet_feature_enable_disable ("ip4-unicast",
+ "ip4-sv-reassembly-feature",
+ sw_if_index, enable_disable, 0, 0);
+}
+#endif /* CLIB_MARCH_VARIANT */
+
+
+#define foreach_ip4_sv_reass_handoff_error \
+_(CONGESTION_DROP, "congestion drop")
+
+
+typedef enum
+{
+#define _(sym,str) IP4_SV_REASSEMBLY_HANDOFF_ERROR_##sym,
+ foreach_ip4_sv_reass_handoff_error
+#undef _
+ IP4_SV_REASSEMBLY_HANDOFF_N_ERROR,
+} ip4_sv_reass_handoff_error_t;
+
+static char *ip4_sv_reass_handoff_error_strings[] = {
+#define _(sym,string) string,
+ foreach_ip4_sv_reass_handoff_error
+#undef _
+};
+
+typedef struct
+{
+ u32 next_worker_index;
+} ip4_sv_reass_handoff_trace_t;
+
+static u8 *
+format_ip4_sv_reass_handoff_trace (u8 * s, va_list * args)
+{
+ CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
+ CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
+ ip4_sv_reass_handoff_trace_t *t =
+ va_arg (*args, ip4_sv_reass_handoff_trace_t *);
+
+ s =
+ format (s, "ip4-sv-reassembly-handoff: next-worker %d",
+ t->next_worker_index);
+
+ return s;
+}
+
+always_inline uword
+ip4_sv_reass_handoff_node_inline (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame, bool is_feature)
+{
+ ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
+
+ vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
+ u32 n_enq, n_left_from, *from;
+ u16 thread_indices[VLIB_FRAME_SIZE], *ti;
+ u32 fq_index;
+
+ from = vlib_frame_vector_args (frame);
+ n_left_from = frame->n_vectors;
+ vlib_get_buffers (vm, from, bufs, n_left_from);
+
+ b = bufs;
+ ti = thread_indices;
+
+ fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index;
+
+ while (n_left_from > 0)
+ {
+ ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index;
+
+ if (PREDICT_FALSE
+ ((node->flags & VLIB_NODE_FLAG_TRACE)
+ && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
+ {
+ ip4_sv_reass_handoff_trace_t *t =
+ vlib_add_trace (vm, node, b[0], sizeof (*t));
+ t->next_worker_index = ti[0];
+ }
+
+ n_left_from -= 1;
+ ti += 1;
+ b += 1;
+ }
+ n_enq =
+ vlib_buffer_enqueue_to_thread (vm, fq_index, from, thread_indices,
+ frame->n_vectors, 1);
+
+ if (n_enq < frame->n_vectors)
+ vlib_node_increment_counter (vm, node->node_index,
+ IP4_SV_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP,
+ frame->n_vectors - n_enq);
+ return frame->n_vectors;
+}
+
+VLIB_NODE_FN (ip4_sv_reass_handoff_node) (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ return ip4_sv_reass_handoff_node_inline (vm, node, frame,
+ false /* is_feature */ );
+}
+
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (ip4_sv_reass_handoff_node) = {
+ .name = "ip4-sv-reassembly-handoff",
+ .vector_size = sizeof (u32),
+ .n_errors = ARRAY_LEN(ip4_sv_reass_handoff_error_strings),
+ .error_strings = ip4_sv_reass_handoff_error_strings,
+ .format_trace = format_ip4_sv_reass_handoff_trace,
+
+ .n_next_nodes = 1,
+
+ .next_nodes = {
+ [0] = "error-drop",
+ },
+};
+/* *INDENT-ON* */
+
+
+/* *INDENT-OFF* */
+VLIB_NODE_FN (ip4_sv_reass_feature_handoff_node) (vlib_main_t * vm,
+ vlib_node_runtime_t *
+ node,
+ vlib_frame_t * frame)
+{
+ return ip4_sv_reass_handoff_node_inline (vm, node, frame,
+ true /* is_feature */ );
+}
+/* *INDENT-ON* */
+
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (ip4_sv_reass_feature_handoff_node) = {
+ .name = "ip4-sv-reass-feature-hoff",
+ .vector_size = sizeof (u32),
+ .n_errors = ARRAY_LEN(ip4_sv_reass_handoff_error_strings),
+ .error_strings = ip4_sv_reass_handoff_error_strings,
+ .format_trace = format_ip4_sv_reass_handoff_trace,
+
+ .n_next_nodes = 1,
+
+ .next_nodes = {
+ [0] = "error-drop",
+ },
+};
+/* *INDENT-ON* */
+
+#ifndef CLIB_MARCH_VARIANT
+int
+ip4_sv_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
+{
+ ip4_sv_reass_main_t *rm = &ip4_sv_reass_main;
+ if (is_enable)
+ {
+ if (!rm->feature_use_refcount)
+ {
+ ++rm->feature_use_refcount;
+ return vnet_feature_enable_disable ("ip4-unicast",
+ "ip4-sv-reassembly-feature",
+ sw_if_index, 1, 0, 0);
+ }
+ ++rm->feature_use_refcount;
+ }
+ else
+ {
+ --rm->feature_use_refcount;
+ if (!rm->feature_use_refcount)
+ return vnet_feature_enable_disable ("ip4-unicast",
+ "ip4-sv-reassembly-feature",
+ sw_if_index, 0, 0, 0);
+ }
+ return -1;
+}
+
+uword
+ip4_sv_reass_custom_register_next_node (uword node_index)
+{
+ return vlib_node_add_next (vlib_get_main (), ip4_sv_reass_custom_node.index,
+ node_index);
+}
+#endif
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */