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Diffstat (limited to 'src/vnet/snap/snap.c')
| -rw-r--r-- | src/vnet/snap/snap.c | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/src/vnet/snap/snap.c b/src/vnet/snap/snap.c new file mode 100644 index 00000000000..64482bfcfbb --- /dev/null +++ b/src/vnet/snap/snap.c @@ -0,0 +1,204 @@ +/* + * 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.c: snap support + * + * Copyright (c) 2010 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. + */ + +#include <vnet/vnet.h> +#include <vnet/snap/snap.h> +#include <vnet/ethernet/ethernet.h> + +/* Global main structure. */ +snap_main_t snap_main; + +static u8 * +format_cisco_snap_protocol (u8 * s, va_list * args) +{ + snap_header_t *h = va_arg (*args, snap_header_t *); + u16 protocol = clib_net_to_host_u16 (h->protocol); + char *t = 0; + switch (protocol) + { +#define _(n,f) case n: t = #f; break; + foreach_snap_cisco_protocol; +#undef _ + default: + break; + } + if (t) + return format (s, "%s", t); + else + return format (s, "unknown 0x%x", protocol); +} + +u8 * +format_snap_protocol (u8 * s, va_list * args) +{ + snap_header_t *h = va_arg (*args, snap_header_t *); + u32 oui = snap_header_get_oui (h); + u16 protocol = clib_net_to_host_u16 (h->protocol); + + switch (oui) + { + case IEEE_OUI_ethernet: + return format (s, "ethernet %U", format_ethernet_type, h->protocol); + + case IEEE_OUI_cisco: + return format (s, "cisco %U", format_cisco_snap_protocol, h); + + default: + return format (s, "oui 0x%06x 0x%04x", oui, protocol); + } +} + +u8 * +format_snap_header_with_length (u8 * s, va_list * args) +{ + snap_main_t *sm = &snap_main; + snap_header_t *h = va_arg (*args, snap_header_t *); + snap_protocol_info_t *pi = snap_get_protocol_info (sm, h); + u32 max_header_bytes = va_arg (*args, u32); + uword indent, header_bytes; + + header_bytes = sizeof (h[0]); + if (max_header_bytes != 0 && header_bytes > max_header_bytes) + return format (s, "snap header truncated"); + + indent = format_get_indent (s); + + s = format (s, "SNAP %U", format_snap_protocol, h); + + if (max_header_bytes != 0 && header_bytes > max_header_bytes && pi != 0) + { + vlib_node_t *node = vlib_get_node (sm->vlib_main, pi->node_index); + if (node->format_buffer) + s = format (s, "\n%U%U", + format_white_space, indent, + node->format_buffer, (void *) (h + 1), + max_header_bytes - header_bytes); + } + + return s; +} + +u8 * +format_snap_header (u8 * s, va_list * args) +{ + snap_header_t *h = va_arg (*args, snap_header_t *); + return format (s, "%U", format_snap_header_with_length, h, 0); +} + +/* Returns snap protocol as an int in host byte order. */ +uword +unformat_snap_protocol (unformat_input_t * input, va_list * args) +{ + snap_header_t *result = va_arg (*args, snap_header_t *); + snap_main_t *sm = &snap_main; + snap_oui_and_protocol_t p; + u32 i; + + /* Numeric type. */ + if (unformat (input, "0x%x 0x%x", &p.oui, &p.protocol)) + { + if (p.oui >= (1 << 24)) + return 0; + if (p.protocol >= (1 << 16)) + return 0; + } + + /* Named type. */ + else if (unformat_user (input, unformat_vlib_number_by_name, + sm->protocol_info_by_name, &i)) + { + snap_protocol_info_t *pi = vec_elt_at_index (sm->protocols, i); + p = pi->oui_and_protocol; + } + + else + return 0; + + snap_header_set_protocol (result, &p); + return 1; +} + +uword +unformat_snap_header (unformat_input_t * input, va_list * args) +{ + u8 **result = va_arg (*args, u8 **); + snap_header_t _h, *h = &_h; + + if (!unformat (input, "%U", unformat_snap_protocol, h)) + return 0; + + /* Add header to result. */ + { + void *p; + u32 n_bytes = sizeof (h[0]); + + vec_add2 (*result, p, n_bytes); + clib_memcpy (p, h, n_bytes); + } + + return 1; +} + +static clib_error_t * +snap_init (vlib_main_t * vm) +{ + snap_main_t *sm = &snap_main; + + memset (sm, 0, sizeof (sm[0])); + sm->vlib_main = vm; + + mhash_init (&sm->protocol_hash, sizeof (uword), + sizeof (snap_oui_and_protocol_t)); + + sm->protocol_info_by_name + = hash_create_string ( /* elts */ 0, sizeof (uword)); + + return vlib_call_init_function (vm, snap_input_init); +} + +VLIB_INIT_FUNCTION (snap_init); + + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |