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Diffstat (limited to 'src/vnet/snap/snap.h')
| -rw-r--r-- | src/vnet/snap/snap.h | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/src/vnet/snap/snap.h b/src/vnet/snap/snap.h new file mode 100644 index 00000000..7cd453e7 --- /dev/null +++ b/src/vnet/snap/snap.h @@ -0,0 +1,206 @@ +/* + * 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: + */ |