/* * 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. */ /* * hdlc.c: hdlc * * 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/hdlc/hdlc.h> /* Global main structure. */ hdlc_main_t hdlc_main; u8 * format_hdlc_protocol (u8 * s, va_list * args) { hdlc_protocol_t p = va_arg (*args, u32); hdlc_main_t * pm = &hdlc_main; hdlc_protocol_info_t * pi = hdlc_get_protocol_info (pm, p); if (pi) s = format (s, "%s", pi->name); else s = format (s, "0x%04x", p); return s; } u8 * format_hdlc_header_with_length (u8 * s, va_list * args) { hdlc_main_t * pm = &hdlc_main; hdlc_header_t * h = va_arg (*args, hdlc_header_t *); u32 max_header_bytes = va_arg (*args, u32); hdlc_protocol_t p = clib_net_to_host_u16 (h->protocol); uword indent, header_bytes; header_bytes = sizeof (h[0]); if (max_header_bytes != 0 && header_bytes > max_header_bytes) return format (s, "hdlc header truncated"); indent = format_get_indent (s); s = format (s, "HDLC %U", format_hdlc_protocol, p); if (h->address != 0xff) s = format (s, ", address 0x%02x", h->address); if (h->control != 0x03) s = format (s, ", control 0x%02x", h->control); if (max_header_bytes != 0 && header_bytes > max_header_bytes) { hdlc_protocol_info_t * pi = hdlc_get_protocol_info (pm, p); vlib_node_t * node = vlib_get_node (pm->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_hdlc_header (u8 * s, va_list * args) { hdlc_header_t * h = va_arg (*args, hdlc_header_t *); return format (s, "%U", format_hdlc_header_with_length, h, 0); } /* Returns hdlc protocol as an int in host byte order. */ uword unformat_hdlc_protocol_host_byte_order (unformat_input_t * input, va_list * args) { u16 * result = va_arg (*args, u16 *); hdlc_main_t * pm = &hdlc_main; int p, i; /* Numeric type. */ if (unformat (input, "0x%x", &p) || unformat (input, "%d", &p)) { if (p >= (1 << 16)) return 0; *result = p; return 1; } /* Named type. */ if (unformat_user (input, unformat_vlib_number_by_name, pm->protocol_info_by_name, &i)) { hdlc_protocol_info_t * pi = vec_elt_at_index (pm->protocol_infos, i); *result = pi->protocol; return 1; } return 0; } uword unformat_hdlc_protocol_net_byte_order (unformat_input_t * input, va_list * args) { u16 * result = va_arg (*args, u16 *); if (! unformat_user (input, unformat_hdlc_protocol_host_byte_order, result)) return 0; *result = clib_host_to_net_u16 ((u16) *result); return 1; } uword unformat_hdlc_header (unformat_input_t * input, va_list * args) { u8 ** result = va_arg (*args, u8 **); hdlc_header_t _h, * h = &_h; u16 p; if (! unformat (input, "%U", unformat_hdlc_protocol_host_byte_order, &p)) return 0; h->address = 0xff; h->control = 0x03; h->protocol = clib_host_to_net_u16 (p); /* 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 u8* hdlc_build_rewrite (vnet_main_t * vnm, u32 sw_if_index, vnet_link_t link_type, const void *dst_address) { hdlc_header_t * h; u8* rewrite = NULL; hdlc_protocol_t protocol; switch (link_type) { #define _(a,b) case VNET_LINK_##a: protocol = HDLC_PROTOCOL_##b; break _ (IP4, ip4); _ (IP6, ip6); _ (MPLS, mpls_unicast); #undef _ default: return (NULL); } vec_validate(rewrite, sizeof(*h)-1); h = (hdlc_header_t *)rewrite; h->address = 0x0f; h->control = 0x00; h->protocol = clib_host_to_net_u16 (protocol); return (rewrite); } VNET_HW_INTERFACE_CLASS (hdlc_hw_interface_class) = { .name = "HDLC", .format_header = format_hdlc_header_with_length, .unformat_header = unformat_hdlc_header, .build_rewrite = hdlc_build_rewrite, .flags = VNET_HW_INTERFACE_CLASS_FLAG_P2P, }; static void add_protocol (hdlc_main_t * pm, hdlc_protocol_t protocol, char * protocol_name) { hdlc_protocol_info_t * pi; u32 i; vec_add2 (pm->protocol_infos, pi, 1); i = pi - pm->protocol_infos; pi->name = protocol_name; pi->protocol = protocol; pi->next_index = pi->node_index = ~0; hash_set (pm->protocol_info_by_protocol, protocol, i); hash_set_mem (pm->protocol_info_by_name, pi->name, i); } static clib_error_t * hdlc_init (vlib_main_t * vm) { hdlc_main_t * pm = &hdlc_main; memset (pm, 0, sizeof (pm[0])); pm->vlib_main = vm; pm->protocol_info_by_name = hash_create_string (0, sizeof (uword)); pm->protocol_info_by_protocol = hash_create (0, sizeof (uword)); #define _(n,s) add_protocol (pm, HDLC_PROTOCOL_##s, #s); foreach_hdlc_protocol #undef _ return vlib_call_init_function (vm, hdlc_input_init); } VLIB_INIT_FUNCTION (hdlc_init); hdlc_main_t * hdlc_get_main (vlib_main_t * vm) { vlib_call_init_function (vm, hdlc_init); return &hdlc_main; }