/* * 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); 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: */