/* * 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. */ /* * snap.h: SNAP 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_snap_h #define included_snap_h #include <vnet/vnet.h> #include <vnet/pg/pg.h> #define foreach_ieee_oui \ _ (0x000000, ethernet) \ _ (0x00000c, cisco) typedef enum { #define _(n,f) IEEE_OUI_##f = n, foreach_ieee_oui #undef _ } ieee_oui_t; #define foreach_snap_cisco_protocol \ _ (0x0102, drip) \ _ (0x0104, port_aggregation_protocol) \ _ (0x0105, mls_hello) \ _ (0x010b, per_vlan_spanning_tree) \ _ (0x010c, vlan_bridge) \ _ (0x0111, unidirectional_link_detection) \ _ (0x2000, cdp) \ _ (0x2001, cgmp) \ _ (0x2003, vtp) \ _ (0x2004, dtp) \ _ (0x200a, stp_uplink_fast) typedef enum { #define _(n,f) SNAP_cisco_##f = n, foreach_snap_cisco_protocol #undef _ } snap_cisco_protocol_t; typedef union { /* *INDENT-OFF* */ CLIB_PACKED (struct { /* OUI: organization unique identifier. */ u8 oui[3]; /* Per-OUI protocol. */ u16 protocol; }); /* *INDENT-ON* */ u8 as_u8[5]; } snap_header_t; typedef struct { u32 oui; u32 protocol; } snap_oui_and_protocol_t; typedef struct { /* Name vector string. */ u8 *name; snap_oui_and_protocol_t oui_and_protocol; /* Node which handles this type. */ u32 node_index; /* snap-input next index for this type. */ u32 next_index; } snap_protocol_info_t; always_inline void snap_header_set_protocol (snap_header_t * h, snap_oui_and_protocol_t * p) { u16 protocol = p->protocol; u32 oui = p->oui; h->protocol = clib_host_to_net_u16 (protocol); h->oui[0] = (oui >> 16) & 0xff; h->oui[1] = (oui >> 8) & 0xff; h->oui[2] = (oui >> 0) & 0xff; } #define foreach_snap_error \ _ (NONE, "no error") \ _ (UNKNOWN_PROTOCOL, "unknown oui/snap protocol") typedef enum { #define _(f,s) SNAP_ERROR_##f, foreach_snap_error #undef _ SNAP_N_ERROR, } snap_error_t; typedef struct { vlib_main_t *vlib_main; /* Vector of known SNAP oui/protocol pairs. */ snap_protocol_info_t *protocols; /* Hash table mapping oui/protocol to protocol index. */ mhash_t protocol_hash; /* Hash table mapping protocol by name. */ uword *protocol_info_by_name; } snap_main_t; always_inline u32 snap_header_get_oui (snap_header_t * h) { return (h->oui[0] << 16) | (h->oui[1] << 8) | h->oui[2]; } always_inline snap_protocol_info_t * snap_get_protocol_info (snap_main_t * sm, snap_header_t * h) { snap_oui_and_protocol_t key; uword *p; key.oui = snap_header_get_oui (h); key.protocol = h->protocol; p = mhash_get (&sm->protocol_hash, &key); return p ? vec_elt_at_index (sm->protocols, p[0]) : 0; } snap_main_t snap_main; /* Register given node index to take input for given snap type. */ void snap_register_input_protocol (vlib_main_t * vm, char *name, u32 ieee_oui, u16 protocol, u32 node_index); format_function_t format_snap_protocol; format_function_t format_snap_header; format_function_t format_snap_header_with_length; /* Parse snap protocol as 0xXXXX or protocol name. */ unformat_function_t unformat_snap_protocol; /* Parse snap header. */ unformat_function_t unformat_snap_header; unformat_function_t unformat_pg_snap_header; always_inline void snap_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_snap_header_with_length; n->unformat_buffer = unformat_snap_header; pn->unformat_edit = unformat_pg_snap_header; } #endif /* included_snap_h */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */