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+/*
+ * Copyright (c) 2015 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.
+ */
+/*
+ * llc.h: LLC definitions
+ *
+ * Copyright (c) 2008 Eliot Dresselhaus
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef included_llc_h
+#define included_llc_h
+
+#include <vnet/vnet.h>
+#include <vnet/pg/pg.h>
+
+/* Protocol (SSAP/DSAP) types. */
+#define foreach_llc_protocol \
+ _ (null, 0x0) \
+ _ (sublayer, 0x2) \
+ _ (sna_path_control, 0x4) \
+ _ (ip4, 0x6) \
+ _ (sna1, 0x8) \
+ _ (sna2, 0xc) \
+ _ (sna3, 0x40) \
+ _ (proway_lan, 0x0e) \
+ _ (netware1, 0x10) \
+ _ (netware2, 0xe0) \
+ _ (osi_layer1, 0x14) \
+ _ (osi_layer2, 0x20) \
+ _ (osi_layer3, 0x34) \
+ _ (osi_layer4, 0x54) \
+ _ (osi_layer5, 0xfe) \
+ _ (bpdu, 0x42) \
+ _ (arp, 0x98) \
+ _ (snap, 0xaa) \
+ _ (vines1, 0xba) \
+ _ (vines2, 0xbc) \
+ _ (netbios, 0xf0) \
+ _ (global_dsap, 0xff)
+
+typedef enum
+{
+#define _(f,n) LLC_PROTOCOL_##f = n,
+ foreach_llc_protocol
+#undef _
+} llc_protocol_t;
+
+typedef struct
+{
+#define LLC_DST_SAP_IS_GROUP (1 << 0)
+#define LLC_SRC_SAP_IS_RESPONSE (1 << 0)
+ u8 dst_sap, src_sap;
+
+ /* Control byte.
+ [0] 1 => supervisory 0 => information
+ [1] unnumbered frame. */
+ u8 control;
+
+ /* Only present if (control & 3) != 3. */
+ u8 extended_control[0];
+} llc_header_t;
+
+always_inline u16
+llc_header_get_control (llc_header_t * h)
+{
+ u16 r = h->control;
+ return r | ((((r & 3) != 3) ? h->extended_control[0] : 0) << 8);
+}
+
+always_inline u8
+llc_header_length (llc_header_t * h)
+{
+ return ((h->control & 3) != 3 ? 4 : 3);
+}
+
+typedef struct
+{
+ /* Name (a c string). */
+ char *name;
+
+ /* LLC protocol (SAP type). */
+ llc_protocol_t protocol;
+
+ /* Node which handles this type. */
+ u32 node_index;
+
+ /* Next index for this type. */
+ u32 next_index;
+} llc_protocol_info_t;
+
+#define foreach_llc_error \
+ _ (NONE, "no error") \
+ _ (UNKNOWN_PROTOCOL, "unknown llc ssap/dsap") \
+ _ (UNKNOWN_CONTROL, "control != 0x3")
+
+typedef enum
+{
+#define _(f,s) LLC_ERROR_##f,
+ foreach_llc_error
+#undef _
+ LLC_N_ERROR,
+} llc_error_t;
+
+typedef struct
+{
+ vlib_main_t *vlib_main;
+
+ llc_protocol_info_t *protocol_infos;
+
+ /* Hash tables mapping name/protocol to protocol info index. */
+ uword *protocol_info_by_name, *protocol_info_by_protocol;
+
+ /* llc-input next index indexed by protocol. */
+ u8 input_next_by_protocol[256];
+} llc_main_t;
+
+always_inline llc_protocol_info_t *
+llc_get_protocol_info (llc_main_t * m, llc_protocol_t protocol)
+{
+ uword *p = hash_get (m->protocol_info_by_protocol, protocol);
+ return p ? vec_elt_at_index (m->protocol_infos, p[0]) : 0;
+}
+
+extern llc_main_t llc_main;
+
+/* Register given node index to take input for given llc type. */
+void
+llc_register_input_protocol (vlib_main_t * vm,
+ llc_protocol_t protocol, u32 node_index);
+
+void llc_set_adjacency (vnet_rewrite_header_t * rw,
+ uword max_data_bytes, llc_protocol_t protocol);
+
+format_function_t format_llc_protocol;
+format_function_t format_llc_header;
+format_function_t format_llc_header_with_length;
+
+/* Parse llc protocol as 0xXXXX or protocol name. */
+unformat_function_t unformat_llc_protocol;
+
+/* Parse llc header. */
+unformat_function_t unformat_llc_header;
+unformat_function_t unformat_pg_llc_header;
+
+always_inline void
+llc_setup_node (vlib_main_t * vm, u32 node_index)
+{
+ vlib_node_t *n = vlib_get_node (vm, node_index);
+ pg_node_t *pn = pg_get_node (node_index);
+
+ n->format_buffer = format_llc_header_with_length;
+ n->unformat_buffer = unformat_llc_header;
+ pn->unformat_edit = unformat_pg_llc_header;
+}
+
+#endif /* included_llc_h */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */