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authorKlement Sekera <ksekera@cisco.com>2021-12-14 18:25:11 +0000
committerOle Tr�an <otroan@employees.org>2022-01-31 15:07:58 +0000
commit01c1fa41f04fbc584165806d3f785cfbbd62cedc (patch)
treefeda9d118e6555ebd5b15b03da49f5b3fa13e1fe /src/vnet/ip/reass/ip4_full_reass.c
parentcf1e8c1eeab1dc07d69210f410a086d7ae4eae90 (diff)
ip: reassembly - add a way to disable for forus
Add API to disable full reassembly of "forus" packets. Mark packets passing through ip[4|6]-local nodes with a new buffer flag and check for that flag in reassembly. Enable IP6 "forus" full reassembly by default to be consistent with existing IP4 setting. Type: improvement Change-Id: I7067792fcd4304182654237968e4c4d9293c6143 Signed-off-by: Klement Sekera <ksekera@cisco.com>
Diffstat (limited to 'src/vnet/ip/reass/ip4_full_reass.c')
-rw-r--r--src/vnet/ip/reass/ip4_full_reass.c122
1 files changed, 108 insertions, 14 deletions
diff --git a/src/vnet/ip/reass/ip4_full_reass.c b/src/vnet/ip/reass/ip4_full_reass.c
index 79f4673a7f5..220117278c0 100644
--- a/src/vnet/ip/reass/ip4_full_reass.c
+++ b/src/vnet/ip/reass/ip4_full_reass.c
@@ -183,11 +183,15 @@ typedef struct
/** Worker handoff */
u32 fq_index;
+ u32 fq_local_index;
u32 fq_feature_index;
u32 fq_custom_index;
// reference count for enabling/disabling feature - per interface
u32 *feature_use_refcount_per_intf;
+
+ // whether local fragmented packets are reassembled or not
+ int is_local_reass_enabled;
} ip4_full_reass_main_t;
extern ip4_full_reass_main_t ip4_full_reass_main;
@@ -219,6 +223,7 @@ typedef enum
RANGE_OVERLAP,
FINALIZE,
HANDOFF,
+ PASSTHROUGH,
} ip4_full_reass_trace_operation_e;
typedef struct
@@ -329,6 +334,9 @@ format_ip4_full_reass_trace (u8 * s, va_list * args)
format (s, "handoff from thread #%u to thread #%u", t->thread_id,
t->thread_id_to);
break;
+ case PASSTHROUGH:
+ s = format (s, "passthrough - not a fragment");
+ break;
}
return s;
}
@@ -1090,8 +1098,9 @@ ip4_full_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node,
}
always_inline uword
-ip4_full_reass_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
- vlib_frame_t * frame, ip4_full_reass_node_type_t type)
+ip4_full_reass_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
+ vlib_frame_t *frame, ip4_full_reass_node_type_t type,
+ bool is_local)
{
u32 *from = vlib_frame_vector_args (frame);
u32 n_left_from, n_left_to_next, *to_next, next_index;
@@ -1127,8 +1136,17 @@ ip4_full_reass_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
{
next0 = vnet_buffer (b0)->ip.reass.next_index;
}
+ ip4_full_reass_add_trace (vm, node, NULL, bi0, PASSTHROUGH, 0,
+ ~0);
+ goto packet_enqueue;
+ }
+
+ if (is_local && !rm->is_local_reass_enabled)
+ {
+ next0 = IP4_FULL_REASS_NEXT_DROP;
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);
@@ -1269,7 +1287,7 @@ VLIB_NODE_FN (ip4_full_reass_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
- return ip4_full_reass_inline (vm, node, frame, NORMAL);
+ return ip4_full_reass_inline (vm, node, frame, NORMAL, false /* is_local */);
}
VLIB_REGISTER_NODE (ip4_full_reass_node) = {
@@ -1288,11 +1306,34 @@ VLIB_REGISTER_NODE (ip4_full_reass_node) = {
},
};
+VLIB_NODE_FN (ip4_local_full_reass_node)
+(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
+{
+ return ip4_full_reass_inline (vm, node, frame, NORMAL, true /* is_local */);
+}
+
+VLIB_REGISTER_NODE (ip4_local_full_reass_node) = {
+ .name = "ip4-local-full-reassembly",
+ .vector_size = sizeof (u32),
+ .format_trace = format_ip4_full_reass_trace,
+ .n_errors = ARRAY_LEN (ip4_full_reass_error_strings),
+ .error_strings = ip4_full_reass_error_strings,
+ .n_next_nodes = IP4_FULL_REASS_N_NEXT,
+ .next_nodes =
+ {
+ [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input",
+ [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop",
+ [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-local-full-reassembly-handoff",
+
+ },
+};
+
VLIB_NODE_FN (ip4_full_reass_node_feature) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
- return ip4_full_reass_inline (vm, node, frame, FEATURE);
+ return ip4_full_reass_inline (vm, node, frame, FEATURE,
+ false /* is_local */);
}
VLIB_REGISTER_NODE (ip4_full_reass_node_feature) = {
@@ -1322,7 +1363,7 @@ VLIB_NODE_FN (ip4_full_reass_node_custom) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
- return ip4_full_reass_inline (vm, node, frame, CUSTOM);
+ return ip4_full_reass_inline (vm, node, frame, CUSTOM, false /* is_local */);
}
VLIB_REGISTER_NODE (ip4_full_reass_node_custom) = {
@@ -1495,12 +1536,16 @@ ip4_full_reass_init_function (vlib_main_t * vm)
rm->ip4_drop_idx = node->index;
rm->fq_index = vlib_frame_queue_main_init (ip4_full_reass_node.index, 0);
+ rm->fq_local_index =
+ vlib_frame_queue_main_init (ip4_local_full_reass_node.index, 0);
rm->fq_feature_index =
vlib_frame_queue_main_init (ip4_full_reass_node_feature.index, 0);
rm->fq_custom_index =
vlib_frame_queue_main_init (ip4_full_reass_node_custom.index, 0);
rm->feature_use_refcount_per_intf = NULL;
+ rm->is_local_reass_enabled = 1;
+
return error;
}
@@ -1745,10 +1790,10 @@ format_ip4_full_reass_handoff_trace (u8 * s, va_list * args)
}
always_inline uword
-ip4_full_reass_handoff_node_inline (vlib_main_t * vm,
- vlib_node_runtime_t * node,
- vlib_frame_t * frame,
- ip4_full_reass_node_type_t type)
+ip4_full_reass_handoff_node_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
+ vlib_frame_t *frame,
+ ip4_full_reass_node_type_t type,
+ bool is_local)
{
ip4_full_reass_main_t *rm = &ip4_full_reass_main;
@@ -1767,7 +1812,14 @@ ip4_full_reass_handoff_node_inline (vlib_main_t * vm,
switch (type)
{
case NORMAL:
- fq_index = rm->fq_index;
+ if (is_local)
+ {
+ fq_index = rm->fq_local_index;
+ }
+ else
+ {
+ fq_index = rm->fq_index;
+ }
break;
case FEATURE:
fq_index = rm->fq_feature_index;
@@ -1777,7 +1829,6 @@ ip4_full_reass_handoff_node_inline (vlib_main_t * vm,
break;
default:
clib_warning ("Unexpected `type' (%d)!", type);
- ASSERT (0);
}
while (n_left_from > 0)
@@ -1811,7 +1862,8 @@ VLIB_NODE_FN (ip4_full_reass_handoff_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
- return ip4_full_reass_handoff_node_inline (vm, node, frame, NORMAL);
+ return ip4_full_reass_handoff_node_inline (vm, node, frame, NORMAL,
+ false /* is_local */);
}
@@ -1829,13 +1881,34 @@ VLIB_REGISTER_NODE (ip4_full_reass_handoff_node) = {
},
};
+VLIB_NODE_FN (ip4_local_full_reass_handoff_node)
+(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
+{
+ return ip4_full_reass_handoff_node_inline (vm, node, frame, NORMAL,
+ true /* is_local */);
+}
+
+VLIB_REGISTER_NODE (ip4_local_full_reass_handoff_node) = {
+ .name = "ip4-local-full-reassembly-handoff",
+ .vector_size = sizeof (u32),
+ .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings),
+ .error_strings = ip4_full_reass_handoff_error_strings,
+ .format_trace = format_ip4_full_reass_handoff_trace,
+
+ .n_next_nodes = 1,
+
+ .next_nodes = {
+ [0] = "error-drop",
+ },
+};
VLIB_NODE_FN (ip4_full_reass_feature_handoff_node) (vlib_main_t * vm,
vlib_node_runtime_t *
node,
vlib_frame_t * frame)
{
- return ip4_full_reass_handoff_node_inline (vm, node, frame, FEATURE);
+ return ip4_full_reass_handoff_node_inline (vm, node, frame, FEATURE,
+ false /* is_local */);
}
@@ -1858,7 +1931,8 @@ VLIB_NODE_FN (ip4_full_reass_custom_handoff_node) (vlib_main_t * vm,
node,
vlib_frame_t * frame)
{
- return ip4_full_reass_handoff_node_inline (vm, node, frame, CUSTOM);
+ return ip4_full_reass_handoff_node_inline (vm, node, frame, CUSTOM,
+ false /* is_local */);
}
@@ -1903,6 +1977,26 @@ ip4_full_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable)
}
return -1;
}
+
+void
+ip4_local_full_reass_enable_disable (int enable)
+{
+ if (enable)
+ {
+ ip4_full_reass_main.is_local_reass_enabled = 1;
+ }
+ else
+ {
+ ip4_full_reass_main.is_local_reass_enabled = 0;
+ }
+}
+
+int
+ip4_local_full_reass_enabled ()
+{
+ return ip4_full_reass_main.is_local_reass_enabled;
+}
+
#endif
/*