diff options
Diffstat (limited to 'src/vnet/snap')
| -rw-r--r-- | src/vnet/snap/node.c | 353 | ||||
| -rw-r--r-- | src/vnet/snap/pg.c | 116 | ||||
| -rw-r--r-- | src/vnet/snap/snap.c | 204 | ||||
| -rw-r--r-- | src/vnet/snap/snap.h | 206 |
4 files changed, 879 insertions, 0 deletions
diff --git a/src/vnet/snap/node.c b/src/vnet/snap/node.c new file mode 100644 index 00000000..884ff324 --- /dev/null +++ b/src/vnet/snap/node.c @@ -0,0 +1,353 @@ +/* + * 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_node.c: snap packet processing + * + * 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 <vlib/vlib.h> +#include <vnet/pg/pg.h> +#include <vnet/llc/llc.h> +#include <vnet/snap/snap.h> + +typedef enum +{ + SNAP_INPUT_NEXT_DROP, + SNAP_INPUT_NEXT_PUNT, + SNAP_INPUT_NEXT_ETHERNET_TYPE, + SNAP_INPUT_N_NEXT, +} snap_input_next_t; + +typedef struct +{ + u8 packet_data[32]; +} snap_input_trace_t; + +static u8 * +format_snap_input_trace (u8 * s, va_list * va) +{ + CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *); + CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *); + snap_input_trace_t *t = va_arg (*va, snap_input_trace_t *); + + s = format (s, "%U", format_snap_header, t->packet_data); + + return s; +} + +static uword +snap_input (vlib_main_t * vm, + vlib_node_runtime_t * node, vlib_frame_t * from_frame) +{ + snap_main_t *sm = &snap_main; + u32 n_left_from, next_index, *from, *to_next; + + from = vlib_frame_vector_args (from_frame); + n_left_from = from_frame->n_vectors; + + if (node->flags & VLIB_NODE_FLAG_TRACE) + vlib_trace_frame_buffers_only (vm, node, + from, + n_left_from, + sizeof (from[0]), + sizeof (snap_input_trace_t)); + + next_index = node->cached_next_index; + + while (n_left_from > 0) + { + u32 n_left_to_next; + + vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); + + while (n_left_from >= 4 && n_left_to_next >= 2) + { + u32 bi0, bi1; + vlib_buffer_t *b0, *b1; + snap_header_t *h0, *h1; + snap_protocol_info_t *pi0, *pi1; + u8 next0, next1, is_ethernet0, is_ethernet1, len0, len1, + enqueue_code; + u32 oui0, oui1; + + /* Prefetch next iteration. */ + { + vlib_buffer_t *b2, *b3; + + b2 = vlib_get_buffer (vm, from[2]); + b3 = vlib_get_buffer (vm, from[3]); + + vlib_prefetch_buffer_header (b2, LOAD); + vlib_prefetch_buffer_header (b3, LOAD); + + CLIB_PREFETCH (b2->data, sizeof (h0[0]), LOAD); + CLIB_PREFETCH (b3->data, sizeof (h1[0]), LOAD); + } + + bi0 = from[0]; + bi1 = from[1]; + to_next[0] = bi0; + to_next[1] = bi1; + from += 2; + to_next += 2; + n_left_to_next -= 2; + n_left_from -= 2; + + b0 = vlib_get_buffer (vm, bi0); + b1 = vlib_get_buffer (vm, bi1); + + h0 = (void *) (b0->data + b0->current_data); + h1 = (void *) (b1->data + b1->current_data); + + oui0 = snap_header_get_oui (h0); + oui1 = snap_header_get_oui (h1); + + is_ethernet0 = oui0 == IEEE_OUI_ethernet; + is_ethernet1 = oui1 == IEEE_OUI_ethernet; + + len0 = sizeof (h0[0]) - (is_ethernet0 ? sizeof (h0->protocol) : 0); + len1 = sizeof (h1[0]) - (is_ethernet1 ? sizeof (h1->protocol) : 0); + + b0->current_data += len0; + b1->current_data += len1; + + b0->current_length -= len0; + b1->current_length -= len1; + + pi0 = snap_get_protocol_info (sm, h0); + pi1 = snap_get_protocol_info (sm, h1); + + next0 = pi0 ? pi0->next_index : SNAP_INPUT_NEXT_DROP; + next1 = pi1 ? pi1->next_index : SNAP_INPUT_NEXT_DROP; + + next0 = is_ethernet0 ? SNAP_INPUT_NEXT_ETHERNET_TYPE : next0; + next1 = is_ethernet1 ? SNAP_INPUT_NEXT_ETHERNET_TYPE : next1; + + /* In case of error. */ + b0->error = node->errors[SNAP_ERROR_UNKNOWN_PROTOCOL]; + b1->error = node->errors[SNAP_ERROR_UNKNOWN_PROTOCOL]; + + enqueue_code = (next0 != next_index) + 2 * (next1 != next_index); + + if (PREDICT_FALSE (enqueue_code != 0)) + { + switch (enqueue_code) + { + case 1: + /* A B A */ + to_next[-2] = bi1; + to_next -= 1; + n_left_to_next += 1; + vlib_set_next_frame_buffer (vm, node, next0, bi0); + break; + + case 2: + /* A A B */ + to_next -= 1; + n_left_to_next += 1; + vlib_set_next_frame_buffer (vm, node, next1, bi1); + break; + + case 3: + /* A B B or A B C */ + to_next -= 2; + n_left_to_next += 2; + vlib_set_next_frame_buffer (vm, node, next0, bi0); + vlib_set_next_frame_buffer (vm, node, next1, bi1); + if (next0 == next1) + { + vlib_put_next_frame (vm, node, next_index, + n_left_to_next); + next_index = next1; + vlib_get_next_frame (vm, node, next_index, to_next, + n_left_to_next); + } + } + } + } + + while (n_left_from > 0 && n_left_to_next > 0) + { + u32 bi0; + vlib_buffer_t *b0; + snap_header_t *h0; + snap_protocol_info_t *pi0; + u8 next0, is_ethernet0, len0; + u32 oui0; + + bi0 = from[0]; + to_next[0] = bi0; + from += 1; + to_next += 1; + n_left_from -= 1; + n_left_to_next -= 1; + + b0 = vlib_get_buffer (vm, bi0); + + h0 = (void *) (b0->data + b0->current_data); + + oui0 = snap_header_get_oui (h0); + + is_ethernet0 = oui0 == IEEE_OUI_ethernet; + + len0 = sizeof (h0[0]) - (is_ethernet0 ? sizeof (h0->protocol) : 0); + + b0->current_data += len0; + + b0->current_length -= len0; + + pi0 = snap_get_protocol_info (sm, h0); + + next0 = pi0 ? pi0->next_index : SNAP_INPUT_NEXT_DROP; + + next0 = is_ethernet0 ? SNAP_INPUT_NEXT_ETHERNET_TYPE : next0; + + /* In case of error. */ + b0->error = node->errors[SNAP_ERROR_UNKNOWN_PROTOCOL]; + + /* Sent packet to wrong next? */ + if (PREDICT_FALSE (next0 != next_index)) + { + /* Return old frame; remove incorrectly enqueued packet. */ + vlib_put_next_frame (vm, node, next_index, n_left_to_next + 1); + + /* Send to correct next. */ + next_index = next0; + vlib_get_next_frame (vm, node, next_index, + to_next, n_left_to_next); + + to_next[0] = bi0; + to_next += 1; + n_left_to_next -= 1; + } + } + + vlib_put_next_frame (vm, node, next_index, n_left_to_next); + } + + return from_frame->n_vectors; +} + +static char *snap_error_strings[] = { +#define _(f,s) s, + foreach_snap_error +#undef _ +}; + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (snap_input_node) = { + .function = snap_input, + .name = "snap-input", + /* Takes a vector of packets. */ + .vector_size = sizeof (u32), + + .n_errors = SNAP_N_ERROR, + .error_strings = snap_error_strings, + + .n_next_nodes = SNAP_INPUT_N_NEXT, + .next_nodes = { + [SNAP_INPUT_NEXT_DROP] = "error-drop", + [SNAP_INPUT_NEXT_PUNT] = "error-punt", + [SNAP_INPUT_NEXT_ETHERNET_TYPE] = "ethernet-input-type", + }, + + .format_buffer = format_snap_header_with_length, + .format_trace = format_snap_input_trace, + .unformat_buffer = unformat_snap_header, +}; +/* *INDENT-ON* */ + +static clib_error_t * +snap_input_init (vlib_main_t * vm) +{ + { + clib_error_t *error = vlib_call_init_function (vm, snap_init); + if (error) + clib_error_report (error); + } + + snap_setup_node (vm, snap_input_node.index); + + llc_register_input_protocol (vm, LLC_PROTOCOL_snap, snap_input_node.index); + + return 0; +} + +VLIB_INIT_FUNCTION (snap_input_init); + +void +snap_register_input_protocol (vlib_main_t * vm, + char *name, + u32 ieee_oui, u16 protocol, u32 node_index) +{ + snap_main_t *sm = &snap_main; + snap_protocol_info_t *pi; + snap_header_t h; + snap_oui_and_protocol_t key; + + { + clib_error_t *error = vlib_call_init_function (vm, snap_input_init); + if (error) + clib_error_report (error); + } + + h.protocol = clib_host_to_net_u16 (protocol); + h.oui[0] = (ieee_oui >> 16) & 0xff; + h.oui[1] = (ieee_oui >> 8) & 0xff; + h.oui[2] = (ieee_oui >> 0) & 0xff; + pi = snap_get_protocol_info (sm, &h); + if (pi) + return; + + vec_add2 (sm->protocols, pi, 1); + + pi->name = format (0, "%s", name); + pi->node_index = node_index; + pi->next_index = vlib_node_add_next (vm, snap_input_node.index, node_index); + + key.oui = ieee_oui; + key.protocol = clib_host_to_net_u16 (protocol); + + mhash_set (&sm->protocol_hash, &key, pi - sm->protocols, /* old_value */ 0); + hash_set_mem (sm->protocol_info_by_name, name, pi - sm->protocols); +} + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ diff --git a/src/vnet/snap/pg.c b/src/vnet/snap/pg.c new file mode 100644 index 00000000..aad125f3 --- /dev/null +++ b/src/vnet/snap/pg.c @@ -0,0 +1,116 @@ +/* + * 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_pg.c: packet generator snap interface + * + * 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. + */ + +#include <vlib/vlib.h> +#include <vnet/pg/pg.h> +#include <vnet/snap/snap.h> + +typedef struct +{ + pg_edit_t oui; + pg_edit_t protocol; +} pg_snap_header_t; + +static inline void +pg_snap_header_init (pg_snap_header_t * e) +{ + pg_edit_init (&e->oui, snap_header_t, oui); + pg_edit_init (&e->protocol, snap_header_t, protocol); +} + +uword +unformat_pg_snap_header (unformat_input_t * input, va_list * args) +{ + pg_stream_t *s = va_arg (*args, pg_stream_t *); + pg_snap_header_t *h; + u32 group_index, error; + + h = pg_create_edit_group (s, sizeof (h[0]), sizeof (snap_header_t), + &group_index); + pg_snap_header_init (h); + + error = 1; + if (!unformat (input, "%U -> %U", + unformat_pg_edit, + unformat_snap_protocol, &h->oui, &h->protocol)) + goto done; + + { + snap_main_t *pm = &snap_main; + snap_protocol_info_t *pi = 0; + pg_node_t *pg_node = 0; + + if (h->oui.type == PG_EDIT_FIXED && h->protocol.type == PG_EDIT_FIXED) + { + u8 *o = h->oui.values[PG_EDIT_LO]; + u8 *p = h->protocol.values[PG_EDIT_LO]; + snap_header_t h; + + h.oui[0] = o[0]; + h.oui[1] = o[1]; + h.oui[2] = o[2]; + h.protocol = *(u16 *) p; + pi = snap_get_protocol_info (pm, &h); + if (pi && pi->node_index != ~0) + pg_node = pg_get_node (pi->node_index); + } + + if (pg_node && pg_node->unformat_edit + && unformat_user (input, pg_node->unformat_edit, s)) + ; + + else if (!unformat_user (input, unformat_pg_payload, s)) + goto done; + } + + error = 0; +done: + if (error) + pg_free_edit_group (s); + return error == 0; +} + + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ diff --git a/src/vnet/snap/snap.c b/src/vnet/snap/snap.c new file mode 100644 index 00000000..64482bfc --- /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: + */ 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: + */ |