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authorKlement Sekera <ksekera@cisco.com>2017-09-20 08:26:30 +0200
committerFlorin Coras <florin.coras@gmail.com>2018-02-01 23:41:17 +0000
commit75e7d1301475d49311d14e202936c62df0c07d10 (patch)
tree1a7e1d211cc97352f093a0207e6c94952e39e611 /src
parent2b9453c55a7294d8eedf126d616a608c32be0e36 (diff)
IPv4/6 reassembly
Change-Id: Ic5dcadd13c88b8a5e7896dab82404509c081614a Signed-off-by: Klement Sekera <ksekera@cisco.com>
Diffstat (limited to 'src')
-rw-r--r--src/vlib/buffer_funcs.h62
-rw-r--r--src/vnet.am2
-rw-r--r--src/vnet/buffer.h12
-rw-r--r--src/vnet/ip/icmp46_packet.h1
-rw-r--r--src/vnet/ip/icmp6.h2
-rw-r--r--src/vnet/ip/ip.api28
-rw-r--r--src/vnet/ip/ip4_error.h9
-rwxr-xr-xsrc/vnet/ip/ip4_forward.c13
-rw-r--r--src/vnet/ip/ip4_input.c2
-rw-r--r--src/vnet/ip/ip4_input.h1
-rw-r--r--src/vnet/ip/ip4_reassembly.c1277
-rw-r--r--src/vnet/ip/ip4_reassembly.h49
-rw-r--r--src/vnet/ip/ip6_error.h9
-rw-r--r--src/vnet/ip/ip6_forward.c2
-rw-r--r--src/vnet/ip/ip6_input.h1
-rw-r--r--src/vnet/ip/ip6_packet.h3
-rw-r--r--src/vnet/ip/ip6_reassembly.c1347
-rw-r--r--src/vnet/ip/ip6_reassembly.h49
-rw-r--r--src/vnet/ip/ip_api.c61
-rw-r--r--src/vnet/ip/lookup.c2
-rw-r--r--src/vnet/ip/lookup.h1
-rw-r--r--src/vnet/ip/protocols.def5
22 files changed, 2930 insertions, 8 deletions
diff --git a/src/vlib/buffer_funcs.h b/src/vlib/buffer_funcs.h
index 4831eb5ebac..cc56db7762c 100644
--- a/src/vlib/buffer_funcs.h
+++ b/src/vlib/buffer_funcs.h
@@ -1004,6 +1004,68 @@ vlib_validate_buffer_set_in_use (vlib_buffer_t * b, u32 expected)
#endif
}
+/** minimum data size of first buffer in a buffer chain */
+#define VLIB_BUFFER_CHAIN_MIN_FIRST_DATA_SIZE (256)
+
+/**
+ * @brief compress buffer chain in a way where the first buffer is at least
+ * VLIB_BUFFER_CHAIN_MIN_FIRST_DATA_SIZE long
+ *
+ * @param[in] vm - vlib_main
+ * @param[in,out] first - first buffer in chain
+ * @param[in,out] discard_vector - vector of buffer indexes which were removed
+ * from the chain
+ */
+always_inline void
+vlib_buffer_chain_compress (vlib_main_t * vm,
+ vlib_buffer_t * first, u32 ** discard_vector)
+{
+ if (first->current_length >= VLIB_BUFFER_CHAIN_MIN_FIRST_DATA_SIZE ||
+ !(first->flags & VLIB_BUFFER_NEXT_PRESENT))
+ {
+ /* this is already big enough or not a chain */
+ return;
+ }
+ /* probe free list to find allocated buffer size to avoid overfill */
+ u32 index;
+ vlib_buffer_free_list_t *free_list =
+ vlib_buffer_get_buffer_free_list (vm, first, &index);
+
+ u32 want_first_size = clib_min (VLIB_BUFFER_CHAIN_MIN_FIRST_DATA_SIZE,
+ free_list->n_data_bytes -
+ first->current_data);
+ do
+ {
+ vlib_buffer_t *second = vlib_get_buffer (vm, first->next_buffer);
+ u32 need = want_first_size - first->current_length;
+ u32 amount_to_copy = clib_min (need, second->current_length);
+ clib_memcpy (((u8 *) vlib_buffer_get_current (first)) +
+ first->current_length,
+ vlib_buffer_get_current (second), amount_to_copy);
+ first->current_length += amount_to_copy;
+ vlib_buffer_advance (second, amount_to_copy);
+ if (first->flags & VLIB_BUFFER_TOTAL_LENGTH_VALID)
+ {
+ first->total_length_not_including_first_buffer -= amount_to_copy;
+ }
+ if (!second->current_length)
+ {
+ vec_add1 (*discard_vector, first->next_buffer);
+ if (second->flags & VLIB_BUFFER_NEXT_PRESENT)
+ {
+ first->next_buffer = second->next_buffer;
+ }
+ else
+ {
+ first->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
+ }
+ second->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
+ }
+ }
+ while ((first->current_length < want_first_size) &&
+ (first->flags & VLIB_BUFFER_NEXT_PRESENT));
+}
+
#endif /* included_vlib_buffer_funcs_h */
/*
diff --git a/src/vnet.am b/src/vnet.am
index 7eb4159e75c..8f884748d0f 100644
--- a/src/vnet.am
+++ b/src/vnet.am
@@ -343,6 +343,7 @@ libvnet_la_SOURCES += \
vnet/ip/ip4_pg.c \
vnet/ip/ip4_source_and_port_range_check.c \
vnet/ip/ip4_source_check.c \
+ vnet/ip/ip4_reassembly.c \
vnet/ip/ip6_format.c \
vnet/ip/ip6_forward.c \
vnet/ip/ip6_punt_drop.c \
@@ -350,6 +351,7 @@ libvnet_la_SOURCES += \
vnet/ip/ip6_input.c \
vnet/ip/ip6_neighbor.c \
vnet/ip/ip6_pg.c \
+ vnet/ip/ip6_reassembly.c \
vnet/ip/ip_api.c \
vnet/ip/ip_checksum.c \
vnet/ip/ip_frag.c \
diff --git a/src/vnet/buffer.h b/src/vnet/buffer.h
index c9f1d6ef6a1..5d7273aa04f 100644
--- a/src/vnet/buffer.h
+++ b/src/vnet/buffer.h
@@ -177,6 +177,18 @@ typedef struct
u8 code;
u32 data;
} icmp;
+
+ /* reassembly */
+ struct
+ {
+ u16 fragment_first;
+ u16 fragment_last;
+ u16 range_first;
+ u16 range_last;
+ u32 next_range_bi;
+ u16 ip6_frag_hdr_offset;
+ u16 estimated_mtu;
+ } reass;
};
} ip;
diff --git a/src/vnet/ip/icmp46_packet.h b/src/vnet/ip/icmp46_packet.h
index a86cbd57bdb..e761af8bf16 100644
--- a/src/vnet/ip/icmp46_packet.h
+++ b/src/vnet/ip/icmp46_packet.h
@@ -149,6 +149,7 @@
_ (parameter_problem, 0, erroneous_header_field) \
_ (parameter_problem, 1, unrecognized_next_header) \
_ (parameter_problem, 2, unrecognized_option) \
+ _ (parameter_problem, 3, first_fragment_has_incomplete_header_chain) \
_ (router_renumbering, 0, command) \
_ (router_renumbering, 1, result) \
_ (node_information_request, 0, data_contains_ip6_address) \
diff --git a/src/vnet/ip/icmp6.h b/src/vnet/ip/icmp6.h
index 9a3487b1c5c..1cac8240466 100644
--- a/src/vnet/ip/icmp6.h
+++ b/src/vnet/ip/icmp6.h
@@ -45,7 +45,7 @@
_ (DEST_UNREACH_SENT, "destination unreachable response sent") \
_ (PACKET_TOO_BIG_SENT, "packet too big response sent") \
_ (TTL_EXPIRE_SENT, "hop limit exceeded response sent") \
- _ (PARAM_PROBLEM_SENT, "parameter Pproblem response sent") \
+ _ (PARAM_PROBLEM_SENT, "parameter problem response sent") \
_ (DROP, "error message dropped")
diff --git a/src/vnet/ip/ip.api b/src/vnet/ip/ip.api
index 0da0a61fb75..6ed5a9d6bdb 100644
--- a/src/vnet/ip/ip.api
+++ b/src/vnet/ip/ip.api
@@ -812,6 +812,34 @@ autoreply define ioam_disable
u16 id;
};
+autoreply define ip_reassembly_set
+{
+ u32 client_index;
+ u32 context;
+ u32 timeout_ms;
+ u32 max_reassemblies;
+ u32 expire_walk_interval_ms;
+ u8 is_ip6;
+};
+
+define ip_reassembly_get
+{
+ u32 client_index;
+ u32 context;
+ u8 is_ip6;
+};
+
+define ip_reassembly_get_reply
+{
+ u32 client_index;
+ u32 context;
+ i32 retval;
+ u32 timeout_ms;
+ u32 max_reassemblies;
+ u32 expire_walk_interval_ms;
+ u8 is_ip6;
+};
+
/*
* Local Variables:
* eval: (c-set-style "gnu")
diff --git a/src/vnet/ip/ip4_error.h b/src/vnet/ip/ip4_error.h
index 4e545aeda3c..00b1c6daad5 100644
--- a/src/vnet/ip/ip4_error.h
+++ b/src/vnet/ip/ip4_error.h
@@ -71,14 +71,19 @@
_ (UNICAST_SOURCE_CHECK_FAILS, "ip4 unicast source check fails") \
\
/* Spoofed packets in ip4-rewrite-local */ \
- _(SPOOFED_LOCAL_PACKETS, "ip4 spoofed local-address packet drops") \
+ _ (SPOOFED_LOCAL_PACKETS, "ip4 spoofed local-address packet drops") \
\
/* Errors singalled by ip4-inacl */ \
_ (INACL_TABLE_MISS, "input ACL table-miss drops") \
_ (INACL_SESSION_DENY, "input ACL session deny drops") \
\
/* Erros from mfib-forward */ \
- _ (RPF_FAILURE, "Multicast RPF check failed")
+ _ (RPF_FAILURE, "Multicast RPF check failed") \
+ \
+ /* Errors signalled by ip4-reassembly */ \
+ _ (REASS_DUPLICATE_FRAGMENT, "duplicate/overlapping fragments") \
+ _ (REASS_LIMIT_REACHED, "drops due to concurrent reassemblies limit") \
+ _ (REASS_TIMEOUT, "fragments dropped due to reassembly timeout")
typedef enum
{
diff --git a/src/vnet/ip/ip4_forward.c b/src/vnet/ip/ip4_forward.c
index 3ddf6dfa783..2a21135bb3e 100755
--- a/src/vnet/ip/ip4_forward.c
+++ b/src/vnet/ip/ip4_forward.c
@@ -1582,8 +1582,12 @@ ip4_local_inline (vlib_main_t * vm,
/* Treat IP frag packets as "experimental" protocol for now
until support of IP frag reassembly is implemented */
- proto0 = ip4_is_fragment (ip0) ? 0xfe : ip0->protocol;
- proto1 = ip4_is_fragment (ip1) ? 0xfe : ip1->protocol;
+ proto0 =
+ ip4_is_fragment (ip0) ? IP_PROTOCOL_VPP_FRAGMENTATION :
+ ip0->protocol;
+ proto1 =
+ ip4_is_fragment (ip1) ? IP_PROTOCOL_VPP_FRAGMENTATION :
+ ip1->protocol;
if (head_of_feature_arc == 0)
goto skip_checks;
@@ -1748,7 +1752,9 @@ ip4_local_inline (vlib_main_t * vm,
/* Treat IP frag packets as "experimental" protocol for now
until support of IP frag reassembly is implemented */
- proto0 = ip4_is_fragment (ip0) ? 0xfe : ip0->protocol;
+ proto0 =
+ ip4_is_fragment (ip0) ? IP_PROTOCOL_VPP_FRAGMENTATION :
+ ip0->protocol;
if (head_of_feature_arc == 0 || p0->flags & VNET_BUFFER_F_IS_NATED)
goto skip_check;
@@ -1839,6 +1845,7 @@ VLIB_REGISTER_NODE (ip4_local_node) =
[IP_LOCAL_NEXT_PUNT] = "ip4-punt",
[IP_LOCAL_NEXT_UDP_LOOKUP] = "ip4-udp-lookup",
[IP_LOCAL_NEXT_ICMP] = "ip4-icmp-input",
+ [IP_LOCAL_NEXT_REASSEMBLY] = "ip4-reassembly",
},
};
/* *INDENT-ON* */
diff --git a/src/vnet/ip/ip4_input.c b/src/vnet/ip/ip4_input.c
index 121f40f473d..61c86ef112d 100644
--- a/src/vnet/ip/ip4_input.c
+++ b/src/vnet/ip/ip4_input.c
@@ -289,6 +289,7 @@ VLIB_REGISTER_NODE (ip4_input_node) = {
[IP4_INPUT_NEXT_LOOKUP] = "ip4-lookup",
[IP4_INPUT_NEXT_LOOKUP_MULTICAST] = "ip4-mfib-forward-lookup",
[IP4_INPUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
+ [IP4_INPUT_NEXT_REASSEMBLY] = "ip4-reassembly",
},
.format_buffer = format_ip4_header,
@@ -311,6 +312,7 @@ VLIB_REGISTER_NODE (ip4_input_no_checksum_node,static) = {
[IP4_INPUT_NEXT_LOOKUP] = "ip4-lookup",
[IP4_INPUT_NEXT_LOOKUP_MULTICAST] = "ip4-mfib-forward-lookup",
[IP4_INPUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
+ [IP4_INPUT_NEXT_REASSEMBLY] = "ip4-reassembly",
},
.format_buffer = format_ip4_header,
diff --git a/src/vnet/ip/ip4_input.h b/src/vnet/ip/ip4_input.h
index 75306a34db3..2692848f8ad 100644
--- a/src/vnet/ip/ip4_input.h
+++ b/src/vnet/ip/ip4_input.h
@@ -52,6 +52,7 @@ typedef enum
IP4_INPUT_NEXT_LOOKUP,
IP4_INPUT_NEXT_LOOKUP_MULTICAST,
IP4_INPUT_NEXT_ICMP_ERROR,
+ IP4_INPUT_NEXT_REASSEMBLY,
IP4_INPUT_N_NEXT,
} ip4_input_next_t;
diff --git a/src/vnet/ip/ip4_reassembly.c b/src/vnet/ip/ip4_reassembly.c
new file mode 100644
index 00000000000..6b8d66532fa
--- /dev/null
+++ b/src/vnet/ip/ip4_reassembly.c
@@ -0,0 +1,1277 @@
+/*
+ * 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 Reassembly.
+ *
+ * This file contains the source code for IPv4 reassembly.
+ */
+
+#include <vppinfra/vec.h>
+#include <vnet/vnet.h>
+#include <vnet/ip/ip.h>
+#include <vppinfra/bihash_24_8.h>
+#include <vnet/ip/ip4_reassembly.h>
+
+#define MSEC_PER_SEC 1000
+#define IP4_REASS_TIMEOUT_DEFAULT_MS 100
+#define IP4_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000 // 10 seconds default
+#define IP4_REASS_MAX_REASSEMBLIES_DEAFULT 1024
+#define IP4_REASS_HT_LOAD_FACTOR (0.75)
+
+#define IP4_REASS_DEBUG_BUFFERS 0
+#if IP4_REASS_DEBUG_BUFFERS
+#define IP4_REASS_DEBUG_BUFFER(bi, what) \
+ do \
+ { \
+ u32 _bi = bi; \
+ printf (#what "buffer %u", _bi); \
+ vlib_buffer_t *_b = vlib_get_buffer (vm, _bi); \
+ while (_b->flags & VLIB_BUFFER_NEXT_PRESENT) \
+ { \
+ _bi = _b->next_buffer; \
+ printf ("[%u]", _bi); \
+ _b = vlib_get_buffer (vm, _bi); \
+ } \
+ printf ("\n"); \
+ fflush (stdout); \
+ } \
+ while (0)
+#else
+#define IP4_REASS_DEBUG_BUFFER(...)
+#endif
+
+static vlib_node_registration_t ip4_reass_node;
+
+typedef struct
+{
+ union
+ {
+ struct
+ {
+ // align by making this 4 octets even though its a 2 octets field
+ u32 xx_id;
+ ip4_address_t src;
+ ip4_address_t dst;
+ // align by making this 4 octets even though its a 2 octets field
+ u32 frag_id;
+ // align by making this 4 octets even though its a 1 octet field
+ u32 proto;
+ u32 unused;
+ };
+ u64 as_u64[3];
+ };
+} ip4_reass_key_t;
+
+always_inline u32
+ip4_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
+ip4_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 ip4_reass_buffer_get_data_offset_no_check (b);
+}
+
+always_inline u16
+ip4_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 + ip4_reass_buffer_get_data_offset (b)) + 1;
+}
+
+always_inline u16
+ip4_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 ip4_reass_buffer_get_data_len_no_check (b);
+}
+
+typedef struct
+{
+ // hash table key
+ ip4_reass_key_t key;
+ f64 first_heard;
+ // time when last packet was received
+ f64 last_heard;
+ // internal id of this reassembly
+ u32 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;
+} ip4_reass_t;
+
+typedef struct
+{
+ // IPv4 config
+ u32 timeout_ms;
+ f64 timeout;
+ u32 expire_walk_interval_ms;
+ u32 max_reass_n;
+
+ // IPv4 runtime
+ ip4_reass_t *pool;
+ clib_bihash_24_8_t hash;
+ u32 reass_n;
+ u32 id_counter;
+ u32 buffers_n;
+
+ // convenience
+ vlib_main_t *vlib_main;
+ vnet_main_t *vnet_main;
+
+ // node index of ip4-drop node
+ u32 ip4_drop_idx;
+ u32 ip4_reass_expire_node_idx;
+
+} ip4_reass_main_t;
+
+ip4_reass_main_t ip4_reass_main;
+
+typedef enum
+{
+ IP4_REASSEMBLY_NEXT_INPUT,
+ IP4_REASSEMBLY_NEXT_DROP,
+ IP4_REASSEMBLY_N_NEXT,
+} ip4_reass_next_t;
+
+typedef enum
+{
+ RANGE_NEW,
+ RANGE_SHRINK,
+ RANGE_DISCARD,
+ RANGE_OVERLAP,
+ FINALIZE,
+} ip4_reass_trace_operation_e;
+
+typedef struct
+{
+ u16 range_first;
+ u16 range_last;
+ u32 range_bi;
+ i32 data_offset;
+ u32 data_len;
+ u32 first_bi;
+} ip4_reass_range_trace_t;
+
+typedef struct
+{
+ ip4_reass_trace_operation_e action;
+ u32 pool_index;
+ u32 reass_id;
+ ip4_reass_range_trace_t trace_range;
+ u32 size_diff;
+ u32 op_id;
+ u32 fragment_first;
+ u32 fragment_last;
+ u32 total_data_len;
+} ip4_reass_trace_t;
+
+void
+ip4_reass_trace_details (vlib_main_t * vm, u32 bi,
+ ip4_reass_range_trace_t * trace)
+{
+ vlib_buffer_t *b = vlib_get_buffer (vm, bi);
+ vnet_buffer_opaque_t *vnb = vnet_buffer (b);
+ trace->range_first = vnb->ip.reass.range_first;
+ trace->range_last = vnb->ip.reass.range_last;
+ trace->data_offset = ip4_reass_buffer_get_data_offset_no_check (b);
+ trace->data_len = ip4_reass_buffer_get_data_len_no_check (b);
+ trace->range_bi = bi;
+}
+
+u8 *
+format_ip4_reass_range_trace (u8 * s, va_list * args)
+{
+ ip4_reass_range_trace_t *trace = va_arg (*args, ip4_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;
+}
+
+u8 *
+format_ip4_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_reass_trace_t *t = va_arg (*args, ip4_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_SHRINK:
+ s = format (s, "\n%Ushrink %U by %u", format_white_space, indent,
+ format_ip4_reass_range_trace, &t->trace_range,
+ t->size_diff);
+ break;
+ case RANGE_DISCARD:
+ s = format (s, "\n%Udiscard %U", format_white_space, indent,
+ format_ip4_reass_range_trace, &t->trace_range);
+ break;
+ case RANGE_NEW:
+ s = format (s, "\n%Unew %U", format_white_space, indent,
+ format_ip4_reass_range_trace, &t->trace_range);
+ break;
+ case RANGE_OVERLAP:
+ s = format (s, "\n%Uoverlapping/ignored %U", format_white_space, indent,
+ format_ip4_reass_range_trace, &t->trace_range);
+ break;
+ case FINALIZE:
+ s = format (s, "\n%Ufinalize reassembly", format_white_space, indent);
+ break;
+ }
+ return s;
+}
+
+void
+ip4_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
+ ip4_reass_main_t * rm, ip4_reass_t * reass, u32 bi,
+ ip4_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);
+ ip4_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
+ t->pool_index = reass - rm->pool;
+ t->reass_id = reass->id;
+ t->action = action;
+ ip4_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_ip4_reass_trace, NULL, NULL, t);
+ printf ("%.*s\n", vec_len (s), s);
+ fflush (stdout);
+ vec_reset_length (s);
+#endif
+}
+
+void
+ip4_reass_free (ip4_reass_main_t * rm, ip4_reass_t * reass)
+{
+ clib_bihash_kv_24_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];
+ clib_bihash_add_del_24_8 (&rm->hash, &kv, 0);
+ pool_put (rm->pool, reass);
+ --rm->reass_n;
+}
+
+static void
+ip4_reass_on_timeout (vlib_main_t * vm, ip4_reass_main_t * rm,
+ ip4_reass_t * reass, u32 ** vec_drop_timeout)
+{
+ 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_timeout, 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;
+ }
+}
+
+ip4_reass_t *
+ip4_reass_find_or_create (vlib_main_t * vm, ip4_reass_main_t * rm,
+ ip4_reass_key_t * k, u32 ** vec_drop_timeout)
+{
+ ip4_reass_t *reass = NULL;
+ f64 now = vlib_time_now (rm->vlib_main);
+ clib_bihash_kv_24_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];
+
+ if (!clib_bihash_search_24_8 (&rm->hash, &kv, &value))
+ {
+ reass = pool_elt_at_index (rm->pool, value.value);
+ if (now > reass->last_heard + rm->timeout)
+ {
+ ip4_reass_on_timeout (vm, rm, reass, vec_drop_timeout);
+ ip4_reass_free (rm, reass);
+ reass = NULL;
+ }
+ }
+
+ if (reass)
+ {
+ reass->last_heard = now;
+ return reass;
+ }
+
+ if (rm->reass_n >= rm->max_reass_n)
+ {
+ reass = NULL;
+ return reass;
+ }
+ else
+ {
+ pool_get (rm->pool, reass);
+ memset (reass, 0, sizeof (*reass));
+ reass->id = rm->id_counter;
+ ++rm->id_counter;
+ reass->first_bi = ~0;
+ reass->last_packet_octet = ~0;
+ reass->data_len = 0;
+ ++rm->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];
+ kv.value = reass - rm->pool;
+ reass->last_heard = now;
+
+ if (clib_bihash_add_del_24_8 (&rm->hash, &kv, 1))
+ {
+ ip4_reass_free (rm, reass);
+ reass = NULL;
+ }
+
+ return reass;
+}
+
+void
+ip4_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node,
+ ip4_reass_main_t * rm, ip4_reass_t * reass, u32 * bi0,
+ u32 * next0, vlib_error_t * error0, u32 next_input,
+ u32 ** vec_drop_compress, u32 ** vec_drop_overlap)
+{
+ ASSERT (~0 != reass->first_bi);
+ vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi);
+ vlib_buffer_t *last_b = NULL;
+ u32 sub_chain_bi = reass->first_bi;
+ u32 total_length = 0;
+ u32 buf_cnt = 0;
+ u32 dropped_cnt = 0;
+ do
+ {
+ u32 tmp_bi = sub_chain_bi;
+ vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi);
+ ip4_header_t *ip = vlib_buffer_get_current (tmp);
+ u32 data_len = ip4_reass_buffer_get_data_len (tmp);
+ u32 trim_front =
+ ip4_header_bytes (ip) + ip4_reass_buffer_get_data_offset (tmp);
+ u32 trim_end =
+ vlib_buffer_length_in_chain (vm, tmp) - trim_front - data_len;
+ if (tmp_bi == reass->first_bi)
+ {
+ /* first buffer - keep ip4 header */
+ ASSERT (0 == ip4_reass_buffer_get_data_offset (tmp));
+ trim_front = 0;
+ trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len -
+ ip4_header_bytes (ip);
+ }
+ 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_overlap, 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);
+ last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
+ ASSERT (rm->buffers_n >= (buf_cnt - dropped_cnt));
+ rm->buffers_n -= buf_cnt - dropped_cnt;
+ 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;
+ ip4_header_t *ip = vlib_buffer_get_current (first_b);
+ ip->flags_and_fragment_offset = 0;
+ ip->length = clib_host_to_net_u16 (first_b->current_length + total_length);
+ ip->checksum = ip4_header_checksum (ip);
+ vlib_buffer_chain_compress (vm, first_b, vec_drop_compress);
+ if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ ip4_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
+ }
+ *bi0 = reass->first_bi;
+ *next0 = next_input;
+ *error0 = IP4_ERROR_NONE;
+ ip4_reass_free (rm, reass);
+ reass = NULL;
+}
+
+static u32
+ip4_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;
+}
+
+static void
+ip4_reass_insert_range_in_chain (vlib_main_t * vm,
+ ip4_reass_main_t * rm,
+ ip4_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 += ip4_reass_buffer_get_data_len (new_next_b);
+ rm->buffers_n += ip4_reass_get_buffer_chain_length (vm, new_next_b);
+}
+
+static void
+ip4_reass_remove_range_from_chain (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ ip4_reass_main_t * rm,
+ u32 ** vec_drop_overlap,
+ ip4_reass_t * reass, u32 prev_range_bi,
+ u32 discard_bi)
+{
+ vlib_buffer_t *discard_b = vlib_get_buffer (vm, discard_bi);
+ vnet_buffer_opaque_t *discard_vnb = vnet_buffer (discard_b);
+ if (~0 != prev_range_bi)
+ {
+ vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi);
+ vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b);
+ ASSERT (prev_vnb->ip.reass.next_range_bi == discard_bi);
+ prev_vnb->ip.reass.next_range_bi = discard_vnb->ip.reass.next_range_bi;
+ }
+ else
+ {
+ reass->first_bi = discard_vnb->ip.reass.next_range_bi;
+ }
+ reass->data_len -= ip4_reass_buffer_get_data_len (discard_b);
+ while (1)
+ {
+ vec_add1 (*vec_drop_overlap, discard_bi);
+ if (PREDICT_FALSE (discard_b->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ ip4_reass_add_trace (vm, node, rm, reass, discard_bi, RANGE_DISCARD,
+ 0);
+ }
+ if (discard_b->flags & VLIB_BUFFER_NEXT_PRESENT)
+ {
+ discard_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT;
+ discard_bi = discard_b->next_buffer;
+ discard_b = vlib_get_buffer (vm, discard_bi);
+ }
+ else
+ {
+ break;
+ }
+ }
+}
+
+void
+ip4_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
+ ip4_reass_main_t * rm, ip4_reass_t * reass, u32 * bi0,
+ u32 * next0, vlib_error_t * error0,
+ u32 ** vec_drop_overlap, u32 ** vec_drop_compress,
+ u32 next_input, u32 next_drop)
+{
+ int consumed = 0;
+ vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
+ ip4_header_t *fip = vlib_buffer_get_current (fb);
+ ASSERT (fb->current_length >= sizeof (*fip));
+ vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
+ u32 fragment_first = fvnb->ip.reass.fragment_first =
+ ip4_get_fragment_offset_bytes (fip);
+ u32 fragment_length =
+ clib_net_to_host_u16 (fip->length) - ip4_header_bytes (fip);
+ u32 fragment_last = fvnb->ip.reass.fragment_last =
+ fragment_first + fragment_length - 1;
+ int more_fragments = ip4_get_fragment_more (fip);
+ u32 candidate_range_bi = reass->first_bi;
+ u32 prev_range_bi = ~0;
+ fvnb->ip.reass.range_first = fragment_first;
+ fvnb->ip.reass.range_last = fragment_last;
+ fvnb->ip.reass.next_range_bi = ~0;
+ if (!more_fragments)
+ {
+ reass->last_packet_octet = fragment_last;
+ }
+ if (~0 == reass->first_bi)
+ {
+ // starting a new reassembly
+ ip4_reass_insert_range_in_chain (vm, rm, reass, prev_range_bi, *bi0);
+ if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ ip4_reass_add_trace (vm, node, rm, reass, *bi0, RANGE_NEW, 0);
+ }
+ *bi0 = ~0;
+ fvnb->ip.reass.estimated_mtu = clib_net_to_host_u16 (fip->length);
+ return;
+ }
+ fvnb->ip.reass.estimated_mtu = clib_min (clib_net_to_host_u16 (fip->length),
+ fvnb->ip.reass.estimated_mtu);
+ while (~0 != candidate_range_bi)
+ {
+ vlib_buffer_t *candidate_b = vlib_get_buffer (vm, candidate_range_bi);
+ vnet_buffer_opaque_t *candidate_vnb = vnet_buffer (candidate_b);
+ if (fragment_first > candidate_vnb->ip.reass.range_last)
+ {
+ // this fragments starts after candidate range
+ prev_range_bi = candidate_range_bi;
+ candidate_range_bi = candidate_vnb->ip.reass.next_range_bi;
+ if (candidate_vnb->ip.reass.range_last < fragment_last &&
+ ~0 == candidate_range_bi)
+ {
+ // special case - this fragment falls beyond all known ranges
+ ip4_reass_insert_range_in_chain (vm, rm, 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
+ ip4_reass_insert_range_in_chain (vm, rm, 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)
+ {
+ // this fragment is a (sub)part of existing range, ignore it
+ if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ ip4_reass_add_trace (vm, node, rm, reass, *bi0,
+ RANGE_OVERLAP, 0);
+ }
+ break;
+ }
+ int discard_candidate = 0;
+ if (fragment_first < candidate_vnb->ip.reass.range_first)
+ {
+ u32 overlap =
+ fragment_last - candidate_vnb->ip.reass.range_first + 1;
+ if (overlap < ip4_reass_buffer_get_data_len (candidate_b))
+ {
+ candidate_vnb->ip.reass.range_first += overlap;
+ ASSERT (reass->data_len >= overlap);
+ reass->data_len -= overlap;
+ if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ ip4_reass_add_trace (vm, node, rm, reass,
+ candidate_range_bi, RANGE_SHRINK,
+ overlap);
+ }
+ ip4_reass_insert_range_in_chain (vm, rm, reass,
+ prev_range_bi, *bi0);
+ consumed = 1;
+ }
+ else
+ {
+ discard_candidate = 1;
+ }
+ }
+ else if (fragment_last > candidate_vnb->ip.reass.range_last)
+ {
+ u32 overlap =
+ candidate_vnb->ip.reass.range_last - fragment_first + 1;
+ if (overlap < ip4_reass_buffer_get_data_len (candidate_b))
+ {
+ fvnb->ip.reass.range_first += overlap;
+ if (~0 != candidate_vnb->ip.reass.next_range_bi)
+ {
+ prev_range_bi = candidate_range_bi;
+ candidate_range_bi =
+ candidate_vnb->ip.reass.next_range_bi;
+ continue;
+ }
+ else
+ {
+ // special case - last range discarded
+ ip4_reass_insert_range_in_chain (vm, rm, reass,
+ candidate_range_bi,
+ *bi0);
+ consumed = 1;
+ }
+ }
+ else
+ {
+ discard_candidate = 1;
+ }
+ }
+ else
+ {
+ discard_candidate = 1;
+ }
+ if (discard_candidate)
+ {
+ u32 next_range_bi = candidate_vnb->ip.reass.next_range_bi;
+ // discard candidate range, probe next range
+ ip4_reass_remove_range_from_chain (vm, node, rm,
+ vec_drop_overlap, reass,
+ prev_range_bi,
+ candidate_range_bi);
+ if (~0 != next_range_bi)
+ {
+ candidate_range_bi = next_range_bi;
+ continue;
+ }
+ else
+ {
+ // special case - last range discarded
+ ip4_reass_insert_range_in_chain (vm, rm, reass,
+ prev_range_bi, *bi0);
+ consumed = 1;
+ }
+ }
+ }
+ break;
+ }
+ if (consumed)
+ {
+ if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ ip4_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)
+ {
+ ip4_reass_finalize (vm, node, rm, reass, bi0, next0, error0, next_input,
+ vec_drop_compress, vec_drop_overlap);
+ }
+ else
+ {
+ if (consumed)
+ {
+ *bi0 = ~0;
+ }
+ else
+ {
+ *next0 = next_drop;
+ *error0 = IP4_ERROR_REASS_DUPLICATE_FRAGMENT;
+ }
+ }
+}
+
+always_inline uword
+ip4_reassembly (vlib_main_t * vm, vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ u32 *from = vlib_frame_vector_args (frame);
+ u32 n_left_from, n_left_to_next, *to_next, next_index;
+ ip4_reass_main_t *rm = &ip4_reass_main;
+
+ n_left_from = frame->n_vectors;
+ next_index = node->cached_next_index;
+ static u32 *vec_drop_timeout = NULL; // indexes of buffers which timed out
+ static u32 *vec_drop_overlap = NULL; // indexes of buffers which were discarded due to overlap
+ static u32 *vec_drop_compress = NULL; // indexes of buffers dicarded due to buffer compression
+ while (n_left_from > 0 || vec_len (vec_drop_timeout) > 0 ||
+ vec_len (vec_drop_overlap) > 0)
+ {
+ vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+
+ while (vec_len (vec_drop_timeout) > 0 && n_left_to_next > 0)
+ {
+ u32 bi = vec_pop (vec_drop_timeout);
+ vlib_buffer_t *b = vlib_get_buffer (vm, bi);
+ b->error = node->errors[IP4_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,
+ IP4_REASSEMBLY_NEXT_DROP);
+ IP4_REASS_DEBUG_BUFFER (bi, enqueue_drop_timeout);
+ ASSERT (rm->buffers_n > 0);
+ --rm->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[IP4_ERROR_REASS_DUPLICATE_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,
+ IP4_REASSEMBLY_NEXT_DROP);
+ IP4_REASS_DEBUG_BUFFER (bi, enqueue_drop_duplicate_fragment);
+ ASSERT (rm->buffers_n > 0);
+ --rm->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[IP4_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,
+ IP4_REASSEMBLY_NEXT_DROP);
+ IP4_REASS_DEBUG_BUFFER (bi, enqueue_drop_compress);
+ ASSERT (rm->buffers_n > 0);
+ --rm->buffers_n;
+ }
+
+ while (n_left_from > 0 && n_left_to_next > 0)
+ {
+ u32 bi0;
+ vlib_buffer_t *b0;
+ u32 next0; //, error0;
+
+ bi0 = from[0];
+ b0 = vlib_get_buffer (vm, bi0);
+
+ ip4_header_t *ip0 = vlib_buffer_get_current (b0);
+ ip4_reass_key_t k;
+ k.src.as_u32 = ip0->src_address.as_u32;
+ k.dst.as_u32 = ip0->dst_address.as_u32;
+ k.xx_id = vnet_buffer (b0)->sw_if_index[VLIB_RX];
+ k.frag_id = ip0->fragment_id;
+ k.proto = ip0->protocol;
+ k.unused = 0;
+ ip4_reass_t *reass =
+ ip4_reass_find_or_create (vm, rm, &k, &vec_drop_timeout);
+
+ u32 error0 = IP4_ERROR_NONE;
+ if (reass)
+ {
+ ip4_reass_update (vm, node, rm, reass, &bi0, &next0, &error0,
+ &vec_drop_overlap, &vec_drop_compress,
+ IP4_REASSEMBLY_NEXT_INPUT,
+ IP4_REASSEMBLY_NEXT_DROP);
+ }
+ else
+ {
+ next0 = IP4_REASSEMBLY_NEXT_DROP;
+ error0 = IP4_ERROR_REASS_LIMIT_REACHED;
+ }
+
+ b0->error = node->errors[error0];
+
+ if (bi0 != ~0)
+ {
+ to_next[0] = bi0;
+ to_next += 1;
+ n_left_to_next -= 1;
+ vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
+ n_left_to_next, bi0, next0);
+ IP4_REASS_DEBUG_BUFFER (bi0, enqueue_next);
+ }
+
+ from += 1;
+ n_left_from -= 1;
+ }
+
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ }
+
+ return frame->n_vectors;
+}
+
+static char *ip4_reassembly_error_strings[] = {
+#define _(sym, string) string,
+ foreach_ip4_error
+#undef _
+};
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (ip4_reass_node, static) = {
+ .function = ip4_reassembly,
+ .name = "ip4-reassembly",
+ .vector_size = sizeof (u32),
+ .format_trace = format_ip4_reass_trace,
+ .n_errors = ARRAY_LEN (ip4_reassembly_error_strings),
+ .error_strings = ip4_reassembly_error_strings,
+ .n_next_nodes = IP4_REASSEMBLY_N_NEXT,
+ .next_nodes =
+ {
+ [IP4_REASSEMBLY_NEXT_INPUT] = "ip4-input",
+ [IP4_REASSEMBLY_NEXT_DROP] = "ip4-drop",
+ },
+};
+/* *INDENT-ON* */
+
+VLIB_NODE_FUNCTION_MULTIARCH (ip4_reass_node, ip4_reassembly)
+ static u32 ip4_reass_get_nbuckets ()
+{
+ ip4_reass_main_t *rm = &ip4_reass_main;
+ u32 nbuckets;
+ u8 i;
+
+ nbuckets = (u32) (rm->max_reass_n / IP4_REASS_HT_LOAD_FACTOR);
+
+ for (i = 0; i < 31; i++)
+ if ((1 << i) >= nbuckets)
+ break;
+ nbuckets = 1 << i;
+
+ return nbuckets;
+}
+
+typedef enum
+{
+ IP4_EVENT_CONFIG_CHANGED = 1,
+} ip4_reass_event_t;
+
+typedef struct
+{
+ int failure;
+ clib_bihash_24_8_t *new_hash;
+} ip4_rehash_cb_ctx;
+
+void
+ip4_rehash_cb (clib_bihash_kv_24_8_t * kv, void *_ctx)
+{
+ ip4_rehash_cb_ctx *ctx = _ctx;
+ if (clib_bihash_add_del_24_8 (ctx->new_hash, kv, 1))
+ {
+ ctx->failure = 1;
+ }
+}
+
+vnet_api_error_t
+ip4_reass_set (u32 timeout_ms, u32 max_reassemblies,
+ u32 expire_walk_interval_ms)
+{
+ u32 old_nbuckets = ip4_reass_get_nbuckets ();
+ ip4_reass_main.timeout_ms = timeout_ms;
+ ip4_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC;
+ ip4_reass_main.max_reass_n = max_reassemblies;
+ ip4_reass_main.expire_walk_interval_ms = expire_walk_interval_ms;
+ vlib_process_signal_event (ip4_reass_main.vlib_main,
+ ip4_reass_main.ip4_reass_expire_node_idx,
+ IP4_EVENT_CONFIG_CHANGED, 0);
+ u32 new_nbuckets = ip4_reass_get_nbuckets ();
+ if (ip4_reass_main.max_reass_n > 0 && new_nbuckets > 1 &&
+ new_nbuckets != old_nbuckets)
+ {
+ clib_bihash_24_8_t new_hash;
+ memset (&new_hash, 0, sizeof (new_hash));
+ ip4_rehash_cb_ctx ctx;
+ ctx.failure = 0;
+ ctx.new_hash = &new_hash;
+ clib_bihash_init_24_8 (&new_hash, "ip4-reass", new_nbuckets,
+ new_nbuckets * 1024);
+ clib_bihash_foreach_key_value_pair_24_8 (&ip4_reass_main.hash,
+ ip4_rehash_cb, &ctx);
+ if (ctx.failure)
+ {
+ clib_bihash_free_24_8 (&new_hash);
+ return -1;
+ }
+ else
+ {
+ clib_bihash_free_24_8 (&ip4_reass_main.hash);
+ clib_memcpy (&ip4_reass_main.hash, &new_hash,
+ sizeof (ip4_reass_main.hash));
+ }
+ }
+ return 0;
+}
+
+vnet_api_error_t
+ip4_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
+ u32 * expire_walk_interval_ms)
+{
+ *timeout_ms = ip4_reass_main.timeout_ms;
+ *max_reassemblies = ip4_reass_main.max_reass_n;
+ *expire_walk_interval_ms = ip4_reass_main.expire_walk_interval_ms;
+ return 0;
+}
+
+clib_error_t *
+ip4_reass_init_function (vlib_main_t * vm)
+{
+ ip4_reass_main_t *rm = &ip4_reass_main;
+ clib_error_t *error = 0;
+ u32 nbuckets;
+
+ rm->vlib_main = vm;
+ rm->vnet_main = vnet_get_main ();
+
+ rm->reass_n = 0;
+ pool_alloc (rm->pool, rm->max_reass_n);
+ ip4_reass_set (IP4_REASS_TIMEOUT_DEFAULT_MS,
+ IP4_REASS_MAX_REASSEMBLIES_DEAFULT,
+ IP4_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
+
+ nbuckets = ip4_reass_get_nbuckets ();
+ clib_bihash_init_24_8 (&rm->hash, "ip4-reass", nbuckets, nbuckets * 1024);
+
+ vlib_node_t *node = vlib_get_node_by_name (vm, (u8 *) "ip4-drop");
+ ASSERT (node);
+ rm->ip4_drop_idx = node->index;
+ node = vlib_get_node_by_name (vm, (u8 *) "ip4-reassembly-expire-walk");
+ ASSERT (node);
+ rm->ip4_reass_expire_node_idx = node->index;
+ return error;
+}
+
+VLIB_INIT_FUNCTION (ip4_reass_init_function);
+
+static uword
+ip4_reass_walk_expired (vlib_main_t * vm,
+ vlib_node_runtime_t * node, vlib_frame_t * f)
+{
+ ip4_reass_main_t *rm = &ip4_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_reass_t *reass;
+ u32 *vec_drop_timeout = NULL;
+ int *pool_indexes_to_free = NULL;
+
+ int index;
+ /* *INDENT-OFF* */
+ pool_foreach_index (index, rm->pool, ({
+ reass = pool_elt_at_index (rm->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_reass_t *reass = pool_elt_at_index (rm->pool, i[0]);
+ ip4_reass_on_timeout (vm, rm, reass, &vec_drop_timeout);
+ ip4_reass_free (rm, reass);
+ }
+ /* *INDENT-ON* */
+
+ while (vec_len (vec_drop_timeout) > 0)
+ {
+ vlib_frame_t *f = vlib_get_frame_to_node (vm, rm->ip4_drop_idx);
+ u32 *to_next = vlib_frame_vector_args (f);
+ u32 n_left_to_next = VLIB_FRAME_SIZE - f->n_vectors;
+ u32 n_trace = 0;
+ while (vec_len (vec_drop_timeout) > 0 && n_left_to_next > 0)
+ {
+ u32 bi = vec_pop (vec_drop_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
+ {
+ ++n_trace;
+ }
+ }
+ b->error = node->errors[IP4_ERROR_REASS_TIMEOUT];
+ to_next[0] = bi;
+ ++f->n_vectors;
+ to_next += 1;
+ n_left_to_next -= 1;
+ IP4_REASS_DEBUG_BUFFER (bi, enqueue_drop_timeout_walk);
+ ASSERT (rm->buffers_n > 0);
+ --rm->buffers_n;
+ }
+ if (PREDICT_FALSE (n_trace > 0))
+ {
+ f->flags |= VLIB_FRAME_TRACE;
+ }
+ vlib_put_frame_to_node (vm, rm->ip4_drop_idx, f);
+ }
+
+ vec_free (pool_indexes_to_free);
+ vec_free (vec_drop_timeout);
+ if (event_data)
+ {
+ _vec_len (event_data) = 0;
+ }
+ }
+
+ return 0;
+}
+
+static vlib_node_registration_t ip4_reass_expire_node;
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (ip4_reass_expire_node, static) = {
+ .function = ip4_reass_walk_expired,
+ .type = VLIB_NODE_TYPE_PROCESS,
+ .name = "ip4-reassembly-expire-walk",
+ .format_trace = format_ip4_reass_trace,
+ .n_errors = ARRAY_LEN (ip4_reassembly_error_strings),
+ .error_strings = ip4_reassembly_error_strings,
+
+};
+/* *INDENT-ON* */
+
+static u8 *
+format_ip4_reass_key (u8 * s, va_list * args)
+{
+ ip4_reass_key_t *key = va_arg (*args, ip4_reass_key_t *);
+ s = format (s, "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u",
+ key->xx_id, format_ip4_address, &key->src, format_ip4_address,
+ &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto);
+ return s;
+}
+
+static u8 *
+format_ip4_reass (u8 * s, va_list * args)
+{
+ vlib_main_t *vm = va_arg (*args, vlib_main_t *);
+ ip4_reass_t *reass = va_arg (*args, ip4_reass_t *);
+
+ s = format (s, "ID: %u, key: %U\n first_bi: %u, data_len: %u, "
+ "last_packet_octet: %u, trace_op_counter: %u\n",
+ reass->id, format_ip4_reass_key, &reass->key, reass->first_bi,
+ reass->data_len, reass->last_packet_octet,
+ reass->trace_op_counter);
+ u32 bi = reass->first_bi;
+ u32 counter = 0;
+ while (~0 != bi)
+ {
+ vlib_buffer_t *b = vlib_get_buffer (vm, bi);
+ vnet_buffer_opaque_t *vnb = vnet_buffer (b);
+ s = format (s, " #%03u: range: [%u, %u], bi: %u, off: %d, len: %u, "
+ "fragment[%u, %u]\n",
+ counter, vnb->ip.reass.range_first,
+ vnb->ip.reass.range_last, bi,
+ ip4_reass_buffer_get_data_offset_no_check (b),
+ ip4_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_ip4_reass (vlib_main_t * vm, unformat_input_t * input,
+ CLIB_UNUSED (vlib_cli_command_t * lmd))
+{
+ ip4_reass_main_t *rm = &ip4_reass_main;
+
+ vlib_cli_output (vm, "---------------------");
+ vlib_cli_output (vm, "IP4 reassembly status");
+ vlib_cli_output (vm, "---------------------");
+ if (unformat (input, "details"))
+ {
+ ip4_reass_t *reass;
+ /* *INDENT-OFF* */
+ pool_foreach (reass, rm->pool, {
+ vlib_cli_output (vm, "%U", format_ip4_reass, vm, reass);
+ });
+ /* *INDENT-ON* */
+ }
+ vlib_cli_output (vm, "---------------------");
+ vlib_cli_output (vm, "Current IP4 reassemblies count: %lu\n", rm->reass_n);
+ vlib_cli_output (vm,
+ "Maximum configured concurrent IP4 reassemblies: %lu\n",
+ (long unsigned) rm->max_reass_n);
+ vlib_cli_output (vm, "Buffers in use: %lu\n",
+ (long unsigned) rm->buffers_n);
+ return 0;
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (show_ip4_reassembly_cmd, static) = {
+ .path = "show ip4-reassembly",
+ .short_help = "show ip4-reassembly [details]",
+ .function = show_ip4_reass,
+};
+/* *INDENT-ON* */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
diff --git a/src/vnet/ip/ip4_reassembly.h b/src/vnet/ip/ip4_reassembly.h
new file mode 100644
index 00000000000..a48c07ef061
--- /dev/null
+++ b/src/vnet/ip/ip4_reassembly.h
@@ -0,0 +1,49 @@
+/*
+ * 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 Reassembly.
+ *
+ * This file contains the source code for IPv4 reassembly.
+ */
+
+#ifndef __included_ip4_reassembly_h__
+#define __included_ip4_reassembly_h__
+
+#include <vnet/api_errno.h>
+#include <vnet/vnet.h>
+
+/**
+ * @brief set ip4 reassembly configuration
+ */
+vnet_api_error_t ip4_reass_set (u32 timeout_ms, u32 max_reassemblies,
+ u32 expire_walk_interval_ms);
+
+/**
+ * @brief get ip4 reassembly configuration
+ */
+vnet_api_error_t ip4_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
+ u32 * expire_walk_interval_ms);
+
+#endif /* __included_ip4_reassembly_h */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
diff --git a/src/vnet/ip/ip6_error.h b/src/vnet/ip/ip6_error.h
index 7bb4b77b5a3..19f20625a10 100644
--- a/src/vnet/ip/ip6_error.h
+++ b/src/vnet/ip/ip6_error.h
@@ -71,7 +71,14 @@
\
/* Erros singalled by ip6-inacl */ \
_ (INACL_TABLE_MISS, "input ACL table-miss drops") \
- _ (INACL_SESSION_DENY, "input ACL session deny drops")
+ _ (INACL_SESSION_DENY, "input ACL session deny drops") \
+ \
+ /* Errors signalled by ip6-reassembly */ \
+ _ (REASS_MISSING_UPPER, "missing-upper layer drops") \
+ _ (REASS_DUPLICATE_FRAGMENT, "duplicate fragments") \
+ _ (REASS_OVERLAPPING_FRAGMENT, "overlapping fragments") \
+ _ (REASS_LIMIT_REACHED, "drops due to concurrent reassemblies limit") \
+ _ (REASS_TIMEOUT, "fragments dropped due to reassembly timeout")
typedef enum
{
diff --git a/src/vnet/ip/ip6_forward.c b/src/vnet/ip/ip6_forward.c
index c1c9ec0b586..5b06ca7609d 100644
--- a/src/vnet/ip/ip6_forward.c
+++ b/src/vnet/ip/ip6_forward.c
@@ -1578,6 +1578,7 @@ ip6_local_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
next0 = lm->local_next_by_ip_protocol[ip0->protocol];
next0 =
error0 != IP6_ERROR_UNKNOWN_PROTOCOL ? IP_LOCAL_NEXT_DROP : next0;
+
p0->error = error_node->errors[error0];
if (head_of_feature_arc)
@@ -1619,6 +1620,7 @@ VLIB_REGISTER_NODE (ip6_local_node, static) =
[IP_LOCAL_NEXT_PUNT] = "ip6-punt",
[IP_LOCAL_NEXT_UDP_LOOKUP] = "ip6-udp-lookup",
[IP_LOCAL_NEXT_ICMP] = "ip6-icmp-input",
+ [IP_LOCAL_NEXT_REASSEMBLY] = "ip6-reassembly",
},
};
/* *INDENT-ON* */
diff --git a/src/vnet/ip/ip6_input.h b/src/vnet/ip/ip6_input.h
index 4c0d78459b1..fe993caa889 100644
--- a/src/vnet/ip/ip6_input.h
+++ b/src/vnet/ip/ip6_input.h
@@ -41,6 +41,7 @@
#define included_ip6_input_h
#include <vnet/ip/ip.h>
+#include <vnet/ip/icmp6.h>
extern char *ip6_error_strings[];
diff --git a/src/vnet/ip/ip6_packet.h b/src/vnet/ip/ip6_packet.h
index c0c745e27fe..6b724370e76 100644
--- a/src/vnet/ip/ip6_packet.h
+++ b/src/vnet/ip/ip6_packet.h
@@ -519,6 +519,9 @@ typedef CLIB_PACKED (struct {
#define ip6_frag_hdr_offset(hdr) \
(clib_net_to_host_u16((hdr)->fragment_offset_and_more) >> 3)
+#define ip6_frag_hdr_offset_bytes(hdr) \
+ (8 * ip6_frag_hdr_offset(hdr))
+
#define ip6_frag_hdr_more(hdr) \
(clib_net_to_host_u16((hdr)->fragment_offset_and_more) & 0x1)
diff --git a/src/vnet/ip/ip6_reassembly.c b/src/vnet/ip/ip6_reassembly.c
new file mode 100644
index 00000000000..d448032b913
--- /dev/null
+++ b/src/vnet/ip/ip6_reassembly.c
@@ -0,0 +1,1347 @@
+/*
+ * 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_DEAFULT 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;
+ // align by making this 4 octets even though its a 2 octets field
+ u32 xx_id;
+ // align by making this 4 octets even though its a 2 octets field
+ u32 frag_id;
+ // align by making this 4 octets even though its a 1 octet field
+ u32 proto;
+ u32 unused;
+ };
+ 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 first packet was received
+ f64 first_heard;
+ // time when last packet was received
+ f64 last_heard;
+ // internal id of this reassembly
+ u32 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;
+} ip6_reass_t;
+
+typedef struct
+{
+ // IPv6 config
+ u32 timeout_ms;
+ f64 timeout;
+ u32 expire_walk_interval_ms;
+ u32 max_reass_n;
+
+ // IPv6 runtime
+ ip6_reass_t *pool;
+ clib_bihash_48_8_t hash;
+ u32 reass_n;
+ u32 id_counter;
+ u32 buffers_n;
+
+ // 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 pool_index;
+ 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;
+}
+
+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;
+}
+
+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);
+ ip6_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0]));
+ t->pool_index = reass - rm->pool;
+ 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
+}
+
+static void
+ip6_reass_free (ip6_reass_main_t * rm, 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 (rm->pool, reass);
+ --rm->reass_n;
+}
+
+static 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;
+ }
+}
+
+static 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);
+}
+
+static ip6_reass_t *
+ip6_reass_find_or_create (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ ip6_reass_main_t * rm,
+ 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 (rm->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, reass);
+ reass = NULL;
+ }
+ }
+
+ if (reass)
+ {
+ reass->last_heard = now;
+ return reass;
+ }
+
+ if (rm->reass_n >= rm->max_reass_n)
+ {
+ reass = NULL;
+ return reass;
+ }
+ else
+ {
+ pool_get (rm->pool, reass);
+ memset (reass, 0, sizeof (*reass));
+ reass->id = rm->id_counter;
+ ++rm->id_counter;
+ reass->first_bi = ~0;
+ reass->last_packet_octet = ~0;
+ reass->data_len = 0;
+ ++rm->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 - rm->pool;
+ reass->last_heard = now;
+
+ if (clib_bihash_add_del_48_8 (&rm->hash, &kv, 1))
+ {
+ ip6_reass_free (rm, reass);
+ reass = NULL;
+ }
+
+ return reass;
+}
+
+void
+ip6_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node,
+ ip6_reass_main_t * rm, ip6_reass_t * reass, u32 * bi0,
+ u32 * next0, vlib_error_t * error0, u32 next_input,
+ u32 ** vec_drop_compress)
+{
+ ASSERT (~0 != reass->first_bi);
+ *bi0 = reass->first_bi;
+ *next0 = next_input;
+ *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));
+ }
+ 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);
+ 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));
+ ip6_reass_free (rm, reass);
+ 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
+ }
+ reass = NULL;
+}
+
+static 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;
+}
+
+static void
+ip6_reass_insert_range_in_chain (vlib_main_t * vm,
+ ip6_reass_main_t * rm,
+ 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);
+ rm->buffers_n += ip6_reass_get_buffer_chain_length (vm, new_next_b);
+}
+
+void
+ip6_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
+ ip6_reass_main_t * rm, ip6_reass_t * reass, u32 * bi0,
+ u32 * next0, vlib_error_t * error0,
+ ip6_frag_hdr_t * frag_hdr, u32 ** vec_drop_overlap,
+ u32 ** vec_drop_compress, u32 next_input, u32 next_drop,
+ u32 next_icmp_error)
+{
+ int consumed = 0;
+ vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0);
+ vnet_buffer_opaque_t *fvnb = vnet_buffer (fb);
+ 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 && 0 != fragment_length % 8)
+ {
+ if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ ip6_reass_add_trace (vm, node, rm, reass, *bi0,
+ ICMP_ERROR_FL_NOT_MULT_8, 0);
+ }
+ *next0 = next_icmp_error;
+ icmp6_error_set_vnet_buffer (fb, ICMP6_parameter_problem,
+ ICMP6_parameter_problem_erroneous_header_field,
+ (u8 *) & fip->payload_length - (u8 *) fip);
+ return;
+ }
+ if (fragment_first + fragment_length > 65535)
+ {
+ if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ ip6_reass_add_trace (vm, node, rm, reass, *bi0,
+ ICMP_ERROR_FL_TOO_BIG, 0);
+ }
+ *next0 = next_icmp_error;
+ ip6_header_t *ip0 = vlib_buffer_get_current (fb);
+ icmp6_error_set_vnet_buffer (fb, ICMP6_parameter_problem,
+ ICMP6_parameter_problem_erroneous_header_field,
+ (u8 *) & frag_hdr->fragment_offset_and_more
+ - (u8 *) ip0);
+ return;
+ }
+ 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, 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);
+ }
+ *bi0 = ~0;
+ return;
+ }
+ fvnb->ip.reass.estimated_mtu =
+ 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, 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, 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, reass);
+ if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ ip6_reass_add_trace (vm, node, rm, reass, *bi0, RANGE_OVERLAP,
+ 0);
+ }
+ *next0 = 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, reass, bi0, next0, error0, next_input,
+ vec_drop_compress);
+ }
+ else
+ {
+ if (consumed)
+ {
+ *bi0 = ~0;
+ }
+ else
+ {
+ *next0 = next_drop;
+ *error0 = IP6_ERROR_REASS_DUPLICATE_FRAGMENT;
+ }
+ }
+}
+
+always_inline uword
+ip6_reassembly (vlib_main_t * vm, vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ 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;
+
+ 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)
+ {
+ 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 (rm->buffers_n > 0);
+ --rm->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 (rm->buffers_n > 0);
+ --rm->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 (rm->buffers_n > 0);
+ --rm->buffers_n;
+ }
+
+ while (n_left_from > 0 && n_left_to_next > 0)
+ {
+ u32 bi0;
+ vlib_buffer_t *b0;
+ u32 next0; //, error0;
+
+ bi0 = from[0];
+ b0 = vlib_get_buffer (vm, bi0);
+
+ ip6_header_t *ip0 = vlib_buffer_get_current (b0);
+ ip6_frag_hdr_t *frag_hdr;
+ ip6_ext_header_t *prev_hdr;
+ ip6_ext_header_find_t (ip0, prev_hdr, frag_hdr,
+ IP_PROTOCOL_IPV6_FRAGMENTATION);
+ if (0 == ip6_frag_hdr_offset (frag_hdr))
+ {
+ // first fragment - verify upper-layer is present
+ 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 (b0, ICMP6_parameter_problem,
+ ICMP6_parameter_problem_first_fragment_has_incomplete_header_chain,
+ 0);
+ b0->error = node->errors[IP6_ERROR_REASS_MISSING_UPPER];
+
+ to_next[0] = bi0;
+ to_next += 1;
+ n_left_to_next -= 1;
+ vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0,
+ IP6_REASSEMBLY_NEXT_ICMP_ERROR);
+ goto next;
+ }
+ }
+ vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset =
+ (u8 *) frag_hdr - (u8 *) ip0;
+
+ ip6_reass_key_t k;
+ k.src.as_u64[0] = ip0->src_address.as_u64[0];
+ k.src.as_u64[1] = ip0->src_address.as_u64[1];
+ k.dst.as_u64[0] = ip0->dst_address.as_u64[0];
+ k.dst.as_u64[1] = ip0->dst_address.as_u64[1];
+ k.xx_id = vnet_buffer (b0)->sw_if_index[VLIB_RX];
+ k.frag_id = frag_hdr->identification;
+ k.proto = ip0->protocol;
+ k.unused = 0;
+ u32 icmp_bi = ~0;
+ ip6_reass_t *reass =
+ ip6_reass_find_or_create (vm, node, rm, &k, &icmp_bi,
+ &vec_timeout);
+
+ u32 error0 = IP6_ERROR_NONE;
+ if (reass)
+ {
+ ip6_reass_update (vm, node, rm, reass, &bi0, &next0, &error0,
+ frag_hdr, &vec_drop_overlap,
+ &vec_drop_compress, IP6_REASSEMBLY_NEXT_INPUT,
+ IP6_REASSEMBLY_NEXT_DROP,
+ IP6_REASSEMBLY_NEXT_ICMP_ERROR);
+ }
+ else
+ {
+ next0 = IP6_REASSEMBLY_NEXT_DROP;
+ error0 = IP6_ERROR_REASS_LIMIT_REACHED;
+ }
+
+ b0->error = node->errors[error0];
+
+ if (~0 != bi0)
+ {
+ to_next[0] = bi0;
+ to_next += 1;
+ n_left_to_next -= 1;
+ 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:
+ from += 1;
+ n_left_from -= 1;
+ }
+
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ }
+
+ return frame->n_vectors;
+}
+
+static char *ip6_reassembly_error_strings[] = {
+#define _(sym, string) string,
+ foreach_ip6_error
+#undef _
+};
+
+/* *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 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;
+
+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;
+ }
+}
+
+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_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;
+ 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 > 1 &&
+ 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;
+}
+
+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;
+
+ rm->vlib_main = vm;
+ rm->vnet_main = vnet_get_main ();
+
+ rm->reass_n = 0;
+ pool_alloc (rm->pool, rm->max_reass_n);
+ ip6_reass_set (IP6_REASS_TIMEOUT_DEFAULT_MS,
+ IP6_REASS_MAX_REASSEMBLIES_DEAFULT,
+ IP6_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS);
+
+ nbuckets = ip6_reass_get_nbuckets ();
+ clib_bihash_init_48_8 (&rm->hash, "ip6-reass", nbuckets, nbuckets * 1024);
+
+ vlib_node_t *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-reassembly-expire-walk");
+ ASSERT (node);
+ rm->ip6_reass_expire_node_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;
+
+ int index;
+ /* *INDENT-OFF* */
+ pool_foreach_index (index, rm->pool, ({
+ reass = pool_elt_at_index (rm->pool, index);
+ if (now > reass->last_heard + rm->timeout)
+ {
+ vec_add1 (pool_indexes_to_free, index);
+ }
+ }));
+ /* *INDENT-ON* */
+ int *i;
+ u32 *vec_icmp_bi = NULL;
+ /* *INDENT-OFF* */
+ vec_foreach (i, pool_indexes_to_free)
+ {
+ ip6_reass_t *reass = pool_elt_at_index (rm->pool, i[0]);
+ u32 icmp_bi = ~0;
+ ip6_reass_on_timeout (vm, node, rm, reass, &icmp_bi, &vec_timeout);
+ if (~0 != icmp_bi)
+ {
+ vec_add1 (vec_icmp_bi, icmp_bi);
+ }
+ ip6_reass_free (rm, reass);
+ }
+ /* *INDENT-ON* */
+
+ 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;
+ u32 n_trace = 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
+ {
+ ++n_trace;
+ }
+ }
+ b->error = node->errors[IP6_ERROR_REASS_TIMEOUT];
+ to_next[0] = bi;
+ ++f->n_vectors;
+ to_next += 1;
+ n_left_to_next -= 1;
+ ASSERT (rm->buffers_n > 0);
+ --rm->buffers_n;
+ }
+ if (PREDICT_FALSE (n_trace > 0))
+ {
+ f->flags |= 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;
+ u32 n_trace = 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
+ {
+ ++n_trace;
+ }
+ }
+ b->error = node->errors[IP6_ERROR_REASS_TIMEOUT];
+ to_next[0] = bi;
+ ++f->n_vectors;
+ to_next += 1;
+ n_left_to_next -= 1;
+ ASSERT (rm->buffers_n > 0);
+ --rm->buffers_n;
+ }
+ if (PREDICT_FALSE (n_trace > 0))
+ {
+ f->flags |= 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: %u, 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, "---------------------");
+ if (unformat (input, "details"))
+ {
+ ip6_reass_t *reass;
+ /* *INDENT-OFF* */
+ pool_foreach (reass, rm->pool, {
+ vlib_cli_output (vm, "%U", format_ip6_reass, vm, reass);
+ });
+ /* *INDENT-ON* */
+ }
+ vlib_cli_output (vm, "---------------------");
+ vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n", rm->reass_n);
+ vlib_cli_output (vm,
+ "Maximum configured concurrent IP6 reassemblies: %lu\n",
+ (long unsigned) rm->max_reass_n);
+ vlib_cli_output (vm, "Buffers in use: %lu\n",
+ (long unsigned) rm->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* */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
diff --git a/src/vnet/ip/ip6_reassembly.h b/src/vnet/ip/ip6_reassembly.h
new file mode 100644
index 00000000000..0de4e04bb2b
--- /dev/null
+++ b/src/vnet/ip/ip6_reassembly.h
@@ -0,0 +1,49 @@
+/*
+ * 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.
+ */
+
+#ifndef __included_ip6_reassembly_h__
+#define __included_ip6_reassembly_h__
+
+#include <vnet/api_errno.h>
+#include <vnet/vnet.h>
+
+/**
+ * @brief set ip6 reassembly configuration
+ */
+vnet_api_error_t ip6_reass_set (u32 timeout_ms, u32 max_reassemblies,
+ u32 expire_walk_interval_ms);
+
+/**
+ * @brief get ip6 reassembly configuration
+ */
+vnet_api_error_t ip6_reass_get (u32 * timeout_ms, u32 * max_reassemblies,
+ u32 * expire_walk_interval_ms);
+
+#endif /* __included_ip6_reassembly_h */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
diff --git a/src/vnet/ip/ip_api.c b/src/vnet/ip/ip_api.c
index c0889ebfa6b..60fa2faf926 100644
--- a/src/vnet/ip/ip_api.c
+++ b/src/vnet/ip/ip_api.c
@@ -42,6 +42,8 @@
#include <vnet/fib/ip4_fib.h>
#include <vnet/fib/ip6_fib.h>
#include <vnet/ip/ip6_hop_by_hop.h>
+#include <vnet/ip/ip4_reassembly.h>
+#include <vnet/ip/ip6_reassembly.h>
#include <vnet/vnet_msg_enum.h>
@@ -97,7 +99,9 @@ _(IOAM_DISABLE, ioam_disable) \
_(IP_SOURCE_AND_PORT_RANGE_CHECK_ADD_DEL, \
ip_source_and_port_range_check_add_del) \
_(IP_SOURCE_AND_PORT_RANGE_CHECK_INTERFACE_ADD_DEL, \
- ip_source_and_port_range_check_interface_add_del)
+ ip_source_and_port_range_check_interface_add_del) \
+_(IP_REASSEMBLY_SET, ip_reassembly_set) \
+_(IP_REASSEMBLY_GET, ip_reassembly_get)
extern void stats_dslock_with_hint (int hint, int tag);
extern void stats_dsunlock (void);
@@ -2786,6 +2790,61 @@ vl_api_set_arp_neighbor_limit_t_handler (vl_api_set_arp_neighbor_limit_t * mp)
REPLY_MACRO (VL_API_SET_ARP_NEIGHBOR_LIMIT_REPLY);
}
+void
+vl_api_ip_reassembly_set_t_handler (vl_api_ip_reassembly_set_t * mp)
+{
+ vl_api_ip_reassembly_set_reply_t *rmp;
+ int rv = 0;
+ if (mp->is_ip6)
+ {
+ rv = ip6_reass_set (clib_net_to_host_u32 (mp->timeout_ms),
+ clib_net_to_host_u32 (mp->max_reassemblies),
+ clib_net_to_host_u32 (mp->expire_walk_interval_ms));
+ }
+ else
+ {
+ rv = ip4_reass_set (clib_net_to_host_u32 (mp->timeout_ms),
+ clib_net_to_host_u32 (mp->max_reassemblies),
+ clib_net_to_host_u32 (mp->expire_walk_interval_ms));
+ }
+
+ REPLY_MACRO (VL_API_IP_REASSEMBLY_SET_REPLY);
+}
+
+void
+vl_api_ip_reassembly_get_t_handler (vl_api_ip_reassembly_get_t * mp)
+{
+ unix_shared_memory_queue_t *q;
+
+ q = vl_api_client_index_to_input_queue (mp->client_index);
+
+ if (q == 0)
+ return;
+
+ vl_api_ip_reassembly_get_reply_t *rmp = vl_msg_api_alloc (sizeof (*rmp));
+ memset (rmp, 0, sizeof (*rmp));
+ rmp->_vl_msg_id = ntohs (VL_API_IP_REASSEMBLY_GET_REPLY);
+ rmp->context = mp->context;
+ rmp->retval = 0;
+ if (mp->is_ip6)
+ {
+ rmp->is_ip6 = 1;
+ ip6_reass_get (&rmp->timeout_ms, &rmp->max_reassemblies,
+ &rmp->expire_walk_interval_ms);
+ }
+ else
+ {
+ rmp->is_ip6 = 0;
+ ip4_reass_get (&rmp->timeout_ms, &rmp->max_reassemblies,
+ &rmp->expire_walk_interval_ms);
+ }
+ rmp->timeout_ms = clib_host_to_net_u32 (rmp->timeout_ms);
+ rmp->max_reassemblies = clib_host_to_net_u32 (rmp->max_reassemblies);
+ rmp->expire_walk_interval_ms =
+ clib_host_to_net_u32 (rmp->expire_walk_interval_ms);
+ vl_msg_api_send_shmem (q, (u8 *) & rmp);
+}
+
#define vl_msg_name_crc_list
#include <vnet/ip/ip.api.h>
#undef vl_msg_name_crc_list
diff --git a/src/vnet/ip/lookup.c b/src/vnet/ip/lookup.c
index 67e46bd8cfa..f2880bf8cd9 100644
--- a/src/vnet/ip/lookup.c
+++ b/src/vnet/ip/lookup.c
@@ -230,6 +230,8 @@ ip_lookup_init (ip_lookup_main_t * lm, u32 is_ip6)
}
lm->local_next_by_ip_protocol[IP_PROTOCOL_UDP] = IP_LOCAL_NEXT_UDP_LOOKUP;
+ lm->local_next_by_ip_protocol[IP_PROTOCOL_VPP_FRAGMENTATION] =
+ IP_LOCAL_NEXT_REASSEMBLY;
lm->local_next_by_ip_protocol[is_ip6 ? IP_PROTOCOL_ICMP6 :
IP_PROTOCOL_ICMP] = IP_LOCAL_NEXT_ICMP;
lm->builtin_protocol_by_ip_protocol[IP_PROTOCOL_UDP] =
diff --git a/src/vnet/ip/lookup.h b/src/vnet/ip/lookup.h
index a89546f5d92..9fe7a1b0085 100644
--- a/src/vnet/ip/lookup.h
+++ b/src/vnet/ip/lookup.h
@@ -111,6 +111,7 @@ typedef enum
IP_LOCAL_NEXT_PUNT,
IP_LOCAL_NEXT_UDP_LOOKUP,
IP_LOCAL_NEXT_ICMP,
+ IP_LOCAL_NEXT_REASSEMBLY,
IP_LOCAL_N_NEXT,
} ip_local_next_t;
diff --git a/src/vnet/ip/protocols.def b/src/vnet/ip/protocols.def
index 77fab31da05..4ec0bbc9284 100644
--- a/src/vnet/ip/protocols.def
+++ b/src/vnet/ip/protocols.def
@@ -158,5 +158,10 @@ ip_protocol (134, RSVP_E2E_IGNORE)
ip_protocol (135, MOBILITY)
ip_protocol (136, UDP_LITE)
ip_protocol (137, MPLS_IN_IP)
+/*
+ * VPPs way of dealing with fragments is to mark them as 0xfe, to be picked
+ * by the corresponding nodes based on this protocol
+ */
+ip_protocol (0xfe, VPP_FRAGMENTATION)
ip_protocol (255, RESERVED)