* See the License for the specific language governing permissions and
* limitations under the License.
*/
+
#include <vnet/classify/vnet_classify.h>
#include <vnet/classify/in_out_acl.h>
#include <vnet/ip/ip.h>
#include <vppinfra/lock.h>
#include <vnet/classify/trace_classify.h>
+
+
/**
* @file
* @brief N-tuple classifier
return 0;
}
+
+/*
+ * Reorder the chain of tables starting with table_index such
+ * that more more-specific masks come before less-specific masks.
+ * Return the new head of the table chain.
+ */
+u32
+classify_sort_table_chain (vnet_classify_main_t * cm, u32 table_index)
+{
+ /*
+ * Form a vector of all classifier tables in this chain.
+ */
+ u32 *tables = 0;
+ vnet_classify_table_t *t;
+ u32 cti;
+ for (cti = table_index; cti != ~0; cti = t->next_table_index)
+ {
+ vec_add1 (tables, cti);
+ t = pool_elt_at_index (cm->tables, cti);
+ }
+
+ /*
+ * Sort filter tables from most-specific mask to least-specific mask.
+ */
+ vec_sort_with_function (tables, filter_table_mask_compare);
+
+ /*
+ * Relink tables via next_table_index fields.
+ */
+ int i;
+ for (i = 0; i < vec_len (tables); i++)
+ {
+ t = pool_elt_at_index (cm->tables, tables[i]);
+
+ if ((i + 1) < vec_len (tables))
+ t->next_table_index = tables[i + 1];
+ else
+ t->next_table_index = ~0;
+ }
+
+ table_index = tables[0];
+ vec_free (tables);
+
+ return table_index;
+}
+
+
+u32
+classify_get_trace_chain (void)
+{
+ u32 table_index;
+
+ table_index = vlib_global_main.trace_filter.classify_table_index;
+
+ return table_index;
+}
+
+/*
+ * Seting the Trace chain to ~0 is a request to delete and clear it.
+ */
+void
+classify_set_trace_chain (vnet_classify_main_t * cm, u32 table_index)
+{
+ if (table_index == ~0)
+ {
+ u32 old_table_index;
+
+ old_table_index = vlib_global_main.trace_filter.classify_table_index;
+ vnet_classify_delete_table_index (cm, old_table_index, 1);
+ }
+
+ vlib_global_main.trace_filter.classify_table_index = table_index;
+}
+
+
+u32
+classify_get_pcap_chain (vnet_classify_main_t * cm, u32 sw_if_index)
+{
+ u32 table_index = ~0;
+
+ if (sw_if_index != ~0
+ && (sw_if_index < vec_len (cm->classify_table_index_by_sw_if_index)))
+ table_index = cm->classify_table_index_by_sw_if_index[sw_if_index];
+
+ return table_index;
+}
+
+void
+classify_set_pcap_chain (vnet_classify_main_t * cm,
+ u32 sw_if_index, u32 table_index)
+{
+ vnet_main_t *vnm = vnet_get_main ();
+
+ if (sw_if_index != ~0 && table_index != ~0)
+ vec_validate_init_empty (cm->classify_table_index_by_sw_if_index,
+ sw_if_index, ~0);
+
+ if (table_index == ~0)
+ {
+ u32 old_table_index = ~0;
+
+ if (sw_if_index < vec_len (cm->classify_table_index_by_sw_if_index))
+ old_table_index =
+ cm->classify_table_index_by_sw_if_index[sw_if_index];
+
+ vnet_classify_delete_table_index (cm, old_table_index, 1);
+ }
+
+ /*
+ * Put the table index where device drivers can find them.
+ * This table index will be either a valid table or a ~0 to clear it.
+ */
+ cm->classify_table_index_by_sw_if_index[sw_if_index] = table_index;
+ if (sw_if_index > 0)
+ {
+ vnet_hw_interface_t *hi;
+ hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
+ hi->trace_classify_table_index = table_index;
+ }
+}
+
+
+/*
+ * Search for a mask-compatible Classify table within the given table chain.
+ */
+u32
+classify_lookup_chain (u32 table_index, u8 * mask, u32 n_skip, u32 n_match)
+{
+ vnet_classify_main_t *cm = &vnet_classify_main;
+ vnet_classify_table_t *t;
+ u32 cti;
+
+ if (table_index == ~0)
+ return ~0;
+
+ for (cti = table_index; cti != ~0; cti = t->next_table_index)
+ {
+ t = pool_elt_at_index (cm->tables, cti);
+
+ /* Classifier geometry mismatch, can't use this table. */
+ if (t->match_n_vectors != n_match || t->skip_n_vectors != n_skip)
+ continue;
+
+ /* Masks aren't congruent, can't use this table. */
+ if (vec_len (t->mask) * sizeof (u32x4) != vec_len (mask))
+ continue;
+
+ /* Masks aren't bit-for-bit identical, can't use this table. */
+ if (memcmp (t->mask, mask, vec_len (mask)))
+ continue;
+
+ /* Winner... */
+ return cti;
+ }
+
+ return ~0;
+}
+
+
static clib_error_t *
classify_filter_command_fn (vlib_main_t * vm,
unformat_input_t * input,
u32 match = ~0;
u8 *match_vector;
int is_add = 1;
- int del_chain = 0;
u32 table_index = ~0;
u32 next_table_index = ~0;
u32 miss_next_index = ~0;
u32 sw_if_index = ~0;
int pkt_trace = 0;
int pcap = 0;
- int i;
- vnet_classify_table_t *t;
u8 *mask = 0;
vnet_classify_main_t *cm = &vnet_classify_main;
int rv = 0;
- vnet_classify_filter_set_t *set = 0;
- u32 set_index = ~0;
clib_error_t *err = 0;
unformat_input_t _line_input, *line_input = &_line_input;
if (!is_add)
{
+ /*
+ * Delete an existing PCAP or trace classify table.
+ */
if (pkt_trace)
- set_index = vlib_global_main.trace_filter.trace_filter_set_index;
- else if (sw_if_index < vec_len (cm->filter_set_by_sw_if_index))
- set_index = cm->filter_set_by_sw_if_index[sw_if_index];
-
- if (set_index == ~0)
- {
- if (pkt_trace)
- err =
- clib_error_return (0, "No pkt trace classify filter set...");
- else if (sw_if_index == 0)
- err = clib_error_return (0, "No pcap classify filter set...");
- else
- err = clib_error_return (0, "No classify filter set for %U...",
- format_vnet_sw_if_index_name, vnm,
- sw_if_index);
- unformat_free (line_input);
- return err;
- }
-
- set = pool_elt_at_index (cm->filter_sets, set_index);
-
- set->refcnt--;
- ASSERT (set->refcnt >= 0);
- if (set->refcnt == 0)
- {
- del_chain = 1;
- table_index = set->table_indices[0];
- vec_reset_length (set->table_indices);
- pool_put (cm->filter_sets, set);
- if (pkt_trace)
- {
- vlib_global_main.trace_filter.trace_filter_set_index = ~0;
- vlib_global_main.trace_filter.trace_classify_table_index = ~0;
- }
- else
- {
- cm->filter_set_by_sw_if_index[sw_if_index] = ~0;
- if (sw_if_index > 0)
- {
- vnet_hw_interface_t *hi =
- vnet_get_sup_hw_interface (vnm, sw_if_index);
- hi->trace_classify_table_index = ~0;
- }
- }
- }
- }
-
- if (is_add)
- {
- if (pkt_trace)
- set_index = vlib_global_main.trace_filter.trace_filter_set_index;
- else if (sw_if_index < vec_len (cm->filter_set_by_sw_if_index))
- set_index = cm->filter_set_by_sw_if_index[sw_if_index];
-
- /* Do we have a filter set for this intfc / pcap yet? */
- if (set_index == ~0)
- {
- pool_get (cm->filter_sets, set);
- set_index = set - cm->filter_sets;
- set->refcnt = 1;
- }
+ classify_set_trace_chain (cm, ~0);
else
- set = pool_elt_at_index (cm->filter_sets, set_index);
-
- ASSERT (set);
-
- for (i = 0; i < vec_len (set->table_indices); i++)
- {
- t = pool_elt_at_index (cm->tables, set->table_indices[i]);
- /* classifier geometry mismatch, can't use this table */
- if (t->match_n_vectors != match || t->skip_n_vectors != skip)
- continue;
- /* Masks aren't congruent, can't use this table */
- if (vec_len (t->mask) * sizeof (u32x4) != vec_len (mask))
- continue;
- /* Masks aren't bit-for-bit identical, can't use this table */
- if (memcmp (t->mask, mask, vec_len (mask)))
- continue;
-
- /* Winner... */
- table_index = set->table_indices[i];
- goto found_table;
- }
- }
+ classify_set_pcap_chain (cm, sw_if_index, ~0);
- rv = vnet_classify_add_del_table (cm, mask, nbuckets, memory_size,
- skip, match, next_table_index,
- miss_next_index, &table_index,
- current_data_flag, current_data_offset,
- is_add, del_chain);
- vec_free (mask);
-
- if (rv != 0)
- {
+ vec_free (mask);
unformat_free (line_input);
- return clib_error_return (0, "vnet_classify_add_del_table returned %d",
- rv);
- }
- if (is_add == 0)
- {
- unformat_free (line_input);
return 0;
}
- /* Remember the table */
- vec_add1 (set->table_indices, table_index);
-
+ /*
+ * Find an existing compatible table or else make a new one.
+ */
if (pkt_trace)
- vlib_global_main.trace_filter.trace_filter_set_index = set_index;
+ table_index = classify_get_trace_chain ();
else
- {
- vec_validate_init_empty (cm->filter_set_by_sw_if_index, sw_if_index,
- ~0);
- cm->filter_set_by_sw_if_index[sw_if_index] = set - cm->filter_sets;
- }
+ table_index = classify_get_pcap_chain (cm, sw_if_index);
- /* Sort filter tables from most-specific mask to least-specific mask */
- vec_sort_with_function (set->table_indices, filter_table_mask_compare);
+ if (table_index != ~0)
+ table_index = classify_lookup_chain (table_index, mask, skip, match);
- /* Setup next_table_index fields */
- for (i = 0; i < vec_len (set->table_indices); i++)
+ /*
+ * When no table is found, make one.
+ */
+ if (table_index == ~0)
{
- t = pool_elt_at_index (cm->tables, set->table_indices[i]);
+ /*
+ * Matching table wasn't found, so create a new one at the
+ * head of the next_table_index chain.
+ */
+ next_table_index = table_index;
+ table_index = ~0;
- if ((i + 1) < vec_len (set->table_indices))
- t->next_table_index = set->table_indices[i + 1];
- else
- t->next_table_index = ~0;
- }
+ rv = vnet_classify_add_del_table (cm, mask, nbuckets, memory_size,
+ skip, match, next_table_index,
+ miss_next_index, &table_index,
+ current_data_flag,
+ current_data_offset, 1, 0);
- /* Put top table index where device drivers can find them */
- if (sw_if_index > 0 && pkt_trace == 0)
- {
- vnet_hw_interface_t *hi = vnet_get_sup_hw_interface (vnm, sw_if_index);
- ASSERT (vec_len (set->table_indices) > 0);
- hi->trace_classify_table_index = set->table_indices[0];
+ if (rv != 0)
+ {
+ vec_free (mask);
+ unformat_free (line_input);
+ return clib_error_return (0,
+ "vnet_classify_add_del_table returned %d",
+ rv);
+ }
+
+ /*
+ * Reorder tables such that masks are most-specify to least-specific.
+ */
+ table_index = classify_sort_table_chain (cm, table_index);
+
+ /*
+ * Put first classifier table in chain in a place where
+ * other data structures expect to find and use it.
+ */
+ if (pkt_trace)
+ classify_set_trace_chain (cm, table_index);
+ else
+ classify_set_pcap_chain (cm, sw_if_index, table_index);
}
-found_table:
+ vec_free (mask);
- /* Now try to parse a session */
+ /*
+ * Now try to parse a and add a filter-match session.
+ */
if (unformat (line_input, "match %U", unformat_classify_match,
cm, &match_vector, table_index) == 0)
return 0;
{
if (enable)
{
- vnet_classify_main_t *cm = &vnet_classify_main;
- vnet_classify_filter_set_t *set;
- u32 set_index = vlib_global_main.trace_filter.trace_filter_set_index;
-
- if (set_index == ~0)
- return -1;
-
- set = pool_elt_at_index (cm->filter_sets, set_index);
- vlib_global_main.trace_filter.trace_classify_table_index =
- set->table_indices[0];
vlib_global_main.trace_filter.trace_filter_enable = 1;
}
else
{
vnet_classify_main_t *cm = &vnet_classify_main;
vnet_main_t *vnm = vnet_get_main ();
- vnet_classify_filter_set_t *set;
u8 *name = 0;
u8 *s = 0;
- u32 set_index;
u32 table_index;
int verbose = 0;
int i, j, limit;
vlib_cli_output (vm, "%-30s%s", "Filter Used By", " Table(s)");
vlib_cli_output (vm, "%-30s%s", "--------------", " --------");
- limit = vec_len (cm->filter_set_by_sw_if_index);
+ limit = vec_len (cm->classify_table_index_by_sw_if_index);
for (i = -1; i < limit; i++)
{
- if (i < 0)
- set_index = vlib_global_main.trace_filter.trace_filter_set_index;
- else
- set_index = cm->filter_set_by_sw_if_index[i];
-
- if (set_index == ~0)
- continue;
-
- set = pool_elt_at_index (cm->filter_sets, set_index);
-
switch (i)
{
case -1:
+ table_index = vlib_global_main.trace_filter.classify_table_index;
name = format (0, "packet tracer:");
break;
+
case 0:
+ table_index = cm->classify_table_index_by_sw_if_index[i];
name = format (0, "pcap rx/tx/drop:");
break;
+
default:
+ table_index = cm->classify_table_index_by_sw_if_index[i];
name = format (0, "%U:", format_vnet_sw_if_index_name, vnm, i);
break;
}
if (verbose)
{
- u32 table_index;
-
- for (j = 0; j < vec_len (set->table_indices); j++)
+ vnet_classify_table_t *t;
+ j = table_index;
+ do
{
- table_index = set->table_indices[j];
- if (table_index != ~0)
- s = format (s, " %u", table_index);
- else
+ if (j == ~0)
s = format (s, " none");
+ else
+ {
+ s = format (s, " %u", j);
+ t = pool_elt_at_index (cm->tables, j);
+ j = t->next_table_index;
+ }
}
+ while (j != ~0);
vlib_cli_output (vm, "%-30v table(s)%v", name, s);
vec_reset_length (s);
}
else
{
- table_index = set->table_indices ? set->table_indices[0] : ~0;
-
if (table_index != ~0)
s = format (s, " %u", table_index);
else
vnet_classify_init (vlib_main_t * vm)
{
vnet_classify_main_t *cm = &vnet_classify_main;
- vnet_classify_filter_set_t *set;
cm->vlib_main = vm;
cm->vnet_main = vnet_get_main ();
vnet_classify_register_unformat_acl_next_index_fn (unformat_acl_next_node);
- /* Filter set 0 is grounded... */
- pool_get_zero (cm->filter_sets, set);
- set->refcnt = 0x7FFFFFFF;
- /* Initialize the pcap filter set */
- vec_validate (cm->filter_set_by_sw_if_index, 0);
- cm->filter_set_by_sw_if_index[0] = 0;
- /* Initialize the packet tracer filter set */
- vlib_global_main.trace_filter.trace_filter_set_index = ~0;
+ vlib_global_main.trace_filter.classify_table_index = ~0;
return 0;
}
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