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-rw-r--r--src/vnet/snap/snap.c204
1 files changed, 204 insertions, 0 deletions
diff --git a/src/vnet/snap/snap.c b/src/vnet/snap/snap.c
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+++ b/src/vnet/snap/snap.c
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+/*
+ * 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:
+ */