diff options
Diffstat (limited to 'src/plugins/ppp/ppp.c')
-rw-r--r-- | src/plugins/ppp/ppp.c | 270 |
1 files changed, 270 insertions, 0 deletions
diff --git a/src/plugins/ppp/ppp.c b/src/plugins/ppp/ppp.c new file mode 100644 index 00000000000..8b394dc4b72 --- /dev/null +++ b/src/plugins/ppp/ppp.c @@ -0,0 +1,270 @@ +/* + * Copyright (c) 2024 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 <plugins/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); +} + +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, +}; + +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; + clib_error_t *error; + vlib_node_t *ip4_input_node, *ip6_input_node; + + clib_memset (pm, 0, sizeof (pm[0])); + pm->vlib_main = vm; + + if ((error = vlib_call_init_function (vm, ip_main_init))) + return error; + + if ((error = vlib_call_init_function (vm, ip4_init))) + return error; + + if ((error = vlib_call_init_function (vm, ip6_init))) + return error; + + 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 _ + + ip4_input_node = vlib_get_node_by_name (vm, (u8 *) "ip4-input"); + ASSERT (ip4_input_node); + ip6_input_node = vlib_get_node_by_name (vm, (u8 *) "ip6-input"); + ASSERT (ip6_input_node); + + ppp_register_input_protocol (vm, PPP_PROTOCOL_ip4, ip4_input_node->index); + ppp_register_input_protocol (vm, PPP_PROTOCOL_ip6, ip6_input_node->index); + + return vlib_call_init_function (vm, ppp_input_init); +} + +VLIB_INIT_FUNCTION (ppp_init); + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |