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Diffstat (limited to 'src/vnet/ip/ip4_options.c')
| -rw-r--r-- | src/vnet/ip/ip4_options.c | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/src/vnet/ip/ip4_options.c b/src/vnet/ip/ip4_options.c new file mode 100644 index 00000000000..c008b9bde8c --- /dev/null +++ b/src/vnet/ip/ip4_options.c @@ -0,0 +1,144 @@ +/* + * Copyright (c) 2018 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. + */ + +/** + * @brief Handle IPv4 header options in the data-path + */ + +#include <vnet/ip/ip.h> + +typedef enum ip4_options_next_t_ +{ + IP4_OPTIONS_NEXT_PUNT, + IP4_OPTIONS_NEXT_LOCAL, + IP4_OPTIONS_N_NEXT, +} ip4_options_next_t; + +typedef struct ip4_options_trace_t_ +{ + u8 option[4]; +} ip4_options_trace_t; + +VLIB_NODE_FN (ip4_options_node) (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + uword n_left_from, n_left_to_next, next_index; + u32 *from, *to_next; + + from = vlib_frame_vector_args (frame); + n_left_from = frame->n_vectors; + next_index = 0; + + while (n_left_from > 0) + { + vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); + + /* + * IP options packets, when properly used, are very low rate, + * so this code is not dual-looped for extra performance. + */ + while (n_left_from > 0 && n_left_to_next > 0) + { + ip4_options_next_t next; + ip4_header_t *ip4; + vlib_buffer_t *b; + u8 *options; + u32 bi; + + bi = from[0]; + from += 1; + n_left_from -= 1; + to_next[0] = bi; + to_next += 1; + n_left_to_next -= 1; + + b = vlib_get_buffer (vm, bi); + ip4 = vlib_buffer_get_current (b); + next = IP4_OPTIONS_NEXT_PUNT; + + options = (u8 *) (ip4 + 1); + + /* + * mask out the copy flag to leave the option type + */ + switch (options[0] & 0x7f) + { + case IP4_ROUTER_ALERT_OPTION: + /* + * if it's an IGMP packet, pass up the local stack + */ + if (IP_PROTOCOL_IGMP == ip4->protocol) + { + next = IP4_OPTIONS_NEXT_LOCAL; + } + break; + default: + break; + } + + if (b->flags & VLIB_BUFFER_IS_TRACED) + { + ip4_options_trace_t *t = + vlib_add_trace (vm, node, b, sizeof (*t)); + + clib_memcpy (t->option, options, 4); + } + vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, + n_left_to_next, bi, next); + + } + + vlib_put_next_frame (vm, node, next_index, n_left_to_next); + } + return frame->n_vectors; +} + +u8 * +format_ip4_options_trace (u8 * s, va_list * args) +{ + CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); + CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); + ip4_options_trace_t *t = va_arg (*args, ip4_options_trace_t *); + u32 indent = format_get_indent (s); + + s = format (s, "%Uoption:[0x%x,0x%x,0x%x,0x%x]", + format_white_space, indent, + t->option[0], t->option[1], t->option[2], t->option[3]); + return s; +} + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (ip4_options_node) = { + .name = "ip4-options", + .vector_size = sizeof (u32), + + .n_next_nodes = IP4_OPTIONS_N_NEXT, + .next_nodes = { + [IP4_OPTIONS_NEXT_PUNT] = "ip4-punt", + [IP4_OPTIONS_NEXT_LOCAL] = "ip4-local", + }, + .format_buffer = format_ip4_header, + .format_trace = format_ip4_options_trace, +}; +/* *INDENT-ON* */ + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |