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Diffstat (limited to 'src/vnet/llc/llc.h')
| -rw-r--r-- | src/vnet/llc/llc.h | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/src/vnet/llc/llc.h b/src/vnet/llc/llc.h new file mode 100644 index 00000000000..0b85f5d8a8b --- /dev/null +++ b/src/vnet/llc/llc.h @@ -0,0 +1,194 @@ +/* + * 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: + */ |