+
+ if (sw_if_index == 0)
+ return clib_error_return (0, "Local interface not supported...");
+
+ if (is_add && mask == 0 && table_index == ~0)
+ return clib_error_return (0, "Mask required");
+
+ if (is_add && skip == ~0 && table_index == ~0)
+ return clib_error_return (0, "skip count required");
+
+ if (is_add && match == ~0 && table_index == ~0)
+ return clib_error_return (0, "match count required");
+
+ if (sw_if_index == ~0 && pkt_trace == 0)
+ return clib_error_return (0, "Must specify trace, pcap or interface...");
+
+ if (pkt_trace && sw_if_index != ~0)
+ return clib_error_return (0, "Packet trace filter is per-system");
+
+ 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];
+
+ if (set_index == ~0)
+ {
+ if (pkt_trace)
+ return clib_error_return (0,
+ "No pkt trace classify filter set...");
+ if (sw_if_index == 0)
+ return clib_error_return (0, "No pcap classify filter set...");
+ else
+ return clib_error_return (0, "No classify filter set for %U...",
+ format_vnet_sw_if_index_name, vnm,
+ sw_if_index);
+ }
+
+ 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;
+ }
+ else
+ set = pool_elt_at_index (cm->filter_sets, set_index);
+
+ for (i = 0; i < vec_len (set->table_indices); i++)
+ {
+ t = pool_elt_at_index (cm->tables, 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) != 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 = i;
+ goto found_table;
+ }
+ }
+
+ 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);
+
+ switch (rv)
+ {
+ case 0:
+ break;
+
+ default:
+ return clib_error_return (0, "vnet_classify_add_del_table returned %d",
+ rv);
+ }
+
+ if (is_add == 0)
+ return 0;
+
+ /* Remember the table */
+ vec_add1 (set->table_indices, table_index);
+
+ if (pkt_trace)
+ vlib_global_main.trace_filter.trace_filter_set_index = set_index;
+ 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;
+ }
+
+ /* 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];
+ }
+
+ /* Sort filter tables from most-specific mask to least-specific mask */
+ vec_sort_with_function (set->table_indices, filter_table_mask_compare);
+
+ ASSERT (set);
+
+ /* Setup next_table_index fields */
+ for (i = 0; i < vec_len (set->table_indices); i++)
+ {
+ t = pool_elt_at_index (cm->tables, set->table_indices[i]);
+
+ if ((i + 1) < vec_len (set->table_indices))
+ t->next_table_index = set->table_indices[i + 1];
+ else
+ t->next_table_index = ~0;
+ }
+
+found_table:
+
+ /* Now try to parse a session */
+ if (unformat (input, "match %U", unformat_classify_match,
+ cm, &match_vector, table_index) == 0)
+ return 0;
+
+ /*
+ * We use hit or miss to determine whether to trace or pcap pkts
+ * so the session setup is very limited
+ */
+ rv = vnet_classify_add_del_session (cm, table_index,
+ match_vector, 0 /* hit_next_index */ ,
+ 0 /* opaque_index */ ,
+ 0 /* advance */ ,
+ 0 /* action */ ,
+ 0 /* metadata */ ,
+ 1 /* is_add */ );
+
+ vec_free (match_vector);
+
+ return 0;
+}
+
+/** Enable / disable packet trace filter */
+int
+vlib_enable_disable_pkt_trace_filter (int enable)
+{
+ 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
+ {
+ vlib_global_main.trace_filter.trace_filter_enable = 0;
+ }
+ return 0;
+}
+
+/*?
+ * Construct an arbitrary set of packet classifier tables for use with
+ * "pcap rx | tx trace," and with the vpp packet tracer
+ *
+ * Packets which match a rule in the classifier table chain
+ * will be traced. The tables are automatically ordered so that
+ * matches in the most specific table are tried first.
+ *
+ * It's reasonably likely that folks will configure a single
+ * table with one or two matches. As a result, we configure
+ * 8 hash buckets and 128K of match rule space. One can override
+ * the defaults by specifiying "buckets <nnn>" and "memory-size <xxx>"
+ * as desired.
+ *
+ * To build up complex filter chains, repeatedly issue the
+ * classify filter debug CLI command. Each command must specify the desired
+ * mask and match values. If a classifier table with a suitable mask
+ * already exists, the CLI command adds a match rule to the existing table.
+ * If not, the CLI command add a new table and the indicated mask rule
+ *
+ * Here is a terse description of the "mask <xxx>" syntax:
+ *
+ * l2 src dst proto tag1 tag2 ignore-tag1 ignore-tag2 cos1 cos2 dot1q dot1ad
+ *
+ * l3 ip4 <ip4-mask> ip6 <ip6-mask>
+ *
+ * <ip4-mask> version hdr_length src[/width] dst[/width]
+ * tos length fragment_id ttl protocol checksum
+ *
+ * <ip6-mask> version traffic-class flow-label src dst proto
+ * payload_length hop_limit protocol
+ *
+ * l4 tcp <tcp-mask> udp <udp_mask> src_port dst_port
+ *
+ * <tcp-mask> src dst # ports
+ *
+ * <udp-mask> src_port dst_port
+ *
+ * To construct matches, add the values to match after the indicated keywords:
+ * in the match syntax. For example:
+ * mask l3 ip4 src -> match l3 ip4 src 192.168.1.11
+ *
+ * @cliexpar
+ * Configuring the classify filter
+ *
+ * Configure a simple classify filter, and configure pcap rx trace to use it:
+ *
+ * <b><em>classify filter rx mask l3 ip4 src match l3 ip4 src 192.168.1.11"</em></b><br>
+ * <b><em>pcap rx trace on max 100 filter</em></b>
+ *
+ * Configure another fairly simple filter
+ *
+ * <b><em>classify filter mask l3 ip4 src dst match l3 ip4 src 192.168.1.10 dst 192.168.2.10"</em></b>
+ *
+ *
+ * Configure a filter for use with the vpp packet tracer:
+ * <b><em>classify filter trace mask l3 ip4 src dst match l3 ip4 src 192.168.1.10 dst 192.168.2.10"</em></b>
+ * <b><em>trace add dpdk-input 100 filter</em></b>
+ *
+ * Clear classifier filters
+ *
+ * <b><em>classify filter [trace | rx | tx | <intfc>] del</em></b>
+ *
+ * To display the top-level classifier tables for each use case:
+ * <b><em>show classify filter</em/></b>
+ *
+ * To inspect the classifier tables, use
+ *
+ * <b><em>show classify table [verbose]</em></b>
+ * The verbose form displays all of the match rules, with hit-counters
+ * @cliexend
+ ?*/
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (classify_filter, static) =
+{
+ .path = "classify filter",
+ .short_help =
+ "classify filter <intfc> | pcap mask <mask-value> match <match-value>\n"
+ " | trace mask <mask-value> match <match-value> [del]\n"
+ " [buckets <nn>] [memory-size <n>]",
+ .function = classify_filter_command_fn,
+};
+/* *INDENT-ON* */
+
+static clib_error_t *
+show_classify_filter_command_fn (vlib_main_t * vm,
+ unformat_input_t * input,
+ vlib_cli_command_t * cmd)
+{
+ 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;
+
+ (void) unformat (input, "verbose %=", &verbose, 1);
+
+ 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);
+
+ 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:
+ name = format (0, "packet tracer:");
+ break;
+ case 0:
+ name = format (0, "pcap rx/tx/drop:");
+ break;
+ default:
+ name = format (0, "%U:", format_vnet_sw_if_index_name, vnm, i);
+ break;
+ }
+
+ if (verbose)
+ {
+ u8 *s = 0;
+ u32 table_index;
+
+ for (j = 0; j < vec_len (set->table_indices); j++)
+ {
+ table_index = set->table_indices[j];
+ if (table_index != ~0)
+ s = format (s, " %u", table_index);
+ else
+ s = format (s, " none");
+ }
+
+ vlib_cli_output (vm, "%-30v table(s)%v", name, s);
+ vec_reset_length (s);
+ }
+ else
+ {
+ u8 *s = 0;
+ table_index = set->table_indices[0];
+
+ if (table_index != ~0)
+ s = format (s, " %u", table_index);
+ else
+ s = format (s, " none");
+
+ vlib_cli_output (vm, "%-30v first table%v", name, s);
+ vec_reset_length (s);
+ }
+ vec_reset_length (name);
+ }
+ vec_free (s);
+ vec_free (name);
+ return 0;
+}
+
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (show_classify_filter, static) =
+{
+ .path = "show classify filter",
+ .short_help = "show classify filter [verbose [nn]]",
+ .function = show_classify_filter_command_fn,
+};
+/* *INDENT-ON* */
+
+
+
+
+static u8 *
+format_vnet_classify_table (u8 * s, va_list * args)
+{
+ vnet_classify_main_t *cm = va_arg (*args, vnet_classify_main_t *);
+ int verbose = va_arg (*args, int);
+ u32 index = va_arg (*args, u32);
+ vnet_classify_table_t *t;
+
+ if (index == ~0)
+ {
+ s = format (s, "%10s%10s%10s%10s", "TableIdx", "Sessions", "NextTbl",
+ "NextNode", verbose ? "Details" : "");
+ return s;
+ }
+
+ t = pool_elt_at_index (cm->tables, index);
+ s = format (s, "%10u%10d%10d%10d", index, t->active_elements,
+ t->next_table_index, t->miss_next_index);
+
+ s = format (s, "\n Heap: %U", format_mheap, t->mheap, 0 /*verbose */ );
+
+ s = format (s, "\n nbuckets %d, skip %d match %d flag %d offset %d",
+ t->nbuckets, t->skip_n_vectors, t->match_n_vectors,
+ t->current_data_flag, t->current_data_offset);
+ s = format (s, "\n mask %U", format_hex_bytes, t->mask,
+ t->match_n_vectors * sizeof (u32x4));
+ s = format (s, "\n linear-search buckets %d\n", t->linear_buckets);
+
+ if (verbose == 0)
+ return s;
+
+ s = format (s, "\n%U", format_classify_table, t, verbose);
+
+ return s;
+}
+
+static clib_error_t *
+show_classify_tables_command_fn (vlib_main_t * vm,
+ unformat_input_t * input,
+ vlib_cli_command_t * cmd)
+{
+ vnet_classify_main_t *cm = &vnet_classify_main;
+ vnet_classify_table_t *t;
+ u32 match_index = ~0;
+ u32 *indices = 0;
+ int verbose = 0;
+ int i;
+
+ while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+ {
+ if (unformat (input, "index %d", &match_index))
+ ;
+ else if (unformat (input, "verbose %d", &verbose))
+ ;
+ else if (unformat (input, "verbose"))
+ verbose = 1;
+ else
+ break;
+ }
+
+ /* *INDENT-OFF* */
+ pool_foreach (t, cm->tables,
+ ({
+ if (match_index == ~0 || (match_index == t - cm->tables))
+ vec_add1 (indices, t - cm->tables);