/* * 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. */ /* * ppp.c: ppp 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/ppp/ppp.h> /* Global main structure. */ ppp_main_t ppp_main; u8 * format_ppp_protocol (u8 * s, va_list * args) { ppp_protocol_t p = va_arg (*args, u32); ppp_main_t *pm = &ppp_main; ppp_protocol_info_t *pi = ppp_get_protocol_info (pm, p); if (pi) s = format (s, "%s", pi->name); else s = format (s, "0x%04x", p); return s; } u8 * format_ppp_header_with_length (u8 * s, va_list * args) { ppp_main_t *pm = &ppp_main; ppp_header_t *h = va_arg (*args, ppp_header_t *); u32 max_header_bytes = va_arg (*args, u32); ppp_protocol_t p = clib_net_to_host_u16 (h->protocol); u32 indent, header_bytes; header_bytes = sizeof (h[0]); if (max_header_bytes != 0 && header_bytes > max_header_bytes) return format (s, "ppp header truncated"); indent = format_get_indent (s); s = format (s, "PPP %U", format_ppp_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) { ppp_protocol_info_t *pi = ppp_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_ppp_header (u8 * s, va_list * args) { ppp_header_t *h = va_arg (*args, ppp_header_t *); return format (s, "%U", format_ppp_header_with_length, h, 0); } /* Returns ppp protocol as an int in host byte order. */ uword unformat_ppp_protocol_host_byte_order (unformat_input_t * input, va_list * args) { u16 *result = va_arg (*args, u16 *); ppp_main_t *pm = &ppp_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)) { ppp_protocol_info_t *pi = vec_elt_at_index (pm->protocol_infos, i); *result = pi->protocol; return 1; } return 0; } uword unformat_ppp_protocol_net_byte_order (unformat_input_t * input, va_list * args) { u16 *result = va_arg (*args, u16 *); if (!unformat_user (input, unformat_ppp_protocol_host_byte_order, result)) return 0; *result = clib_host_to_net_u16 ((u16) * result); return 1; } uword unformat_ppp_header (unformat_input_t * input, va_list * args) { u8 **result = va_arg (*args, u8 **); ppp_header_t _h, *h = &_h; u16 p; if (!unformat (input, "%U", unformat_ppp_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 * ppp_build_rewrite (vnet_main_t * vnm, u32 sw_if_index, vnet_link_t link_type, const void *dst_hw_address) { ppp_header_t *h; u8 *rewrite = NULL; ppp_protocol_t protocol; switch (link_type) { #define _(a,b) case VNET_LINK_##a: protocol = PPP_PROTOCOL_##b; break _(IP4, ip4); _(IP6, ip6); _(MPLS, mpls_unicast); #undef _ default: return (NULL); } vec_validate (rewrite, sizeof (*h) - 1); h = (ppp_header_t *) rewrite; h->address = 0xff; h->control = 0x03; h->protocol = clib_host_to_net_u16 (protocol); return (rewrite); } /* *INDENT-OFF* */ VNET_HW_INTERFACE_CLASS (ppp_hw_interface_class) = { .name = "PPP", .format_header = format_ppp_header_with_length, .unformat_header = unformat_ppp_header, .build_rewrite = ppp_build_rewrite, .flags = VNET_HW_INTERFACE_CLASS_FLAG_P2P, }; /* *INDENT-ON* */ static void add_protocol (ppp_main_t * pm, ppp_protocol_t protocol, char *protocol_name) { ppp_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 * ppp_init (vlib_main_t * vm) { ppp_main_t *pm = &ppp_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, PPP_PROTOCOL_##s, #s); foreach_ppp_protocol; #undef _ return vlib_call_init_function (vm, ppp_input_init); } VLIB_INIT_FUNCTION (ppp_init); ppp_main_t * ppp_get_main (vlib_main_t * vm) { vlib_call_init_function (vm, ppp_init); return &ppp_main; } /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */