vpp - Vector Packet Processing

Age	Commit message (Expand)	Author	Files	Lines
2018-07-26	Initial commit of Sphinx docs	John DeNisco	1	-0/+0

/* * Copyright (c) 2015-2019 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. */ /* * ip/udp_pg: UDP packet-generator 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 <vnet/pg/pg.h> #include <vnet/ip/ip.h> /* for unformat_udp_udp_port */ #include <vnet/udp/udp.h> #define UDP_PG_EDIT_LENGTH (1 << 0) #define UDP_PG_EDIT_CHECKSUM (1 << 1) always_inline void udp_pg_edit_function_inline (pg_main_t * pg, pg_stream_t * s, pg_edit_group_t * g, u32 * packets, u32 n_packets, u32 flags) { vlib_main_t *vm = vlib_get_main (); u32 ip_offset, udp_offset; udp_offset = g->start_byte_offset; ip_offset = (g - 1)->start_byte_offset; while (n_packets >= 1) { vlib_buffer_t *p0; ip4_header_t *ip0; udp_header_t *udp0; u32 udp_len0; p0 = vlib_get_buffer (vm, packets[0]); n_packets -= 1; packets += 1; ip0 = (void *) (p0->data + ip_offset); udp0 = (void *) (p0->data + udp_offset); udp_len0 = vlib_buffer_length_in_chain (vm, p0) - udp_offset; if (flags & UDP_PG_EDIT_LENGTH) udp0->length = clib_host_to_net_u16 (udp_len0); else udp_len0 = clib_host_to_net_u16 (udp0->length); /* Initialize checksum with header. */ if (flags & UDP_PG_EDIT_CHECKSUM) { ip_csum_t sum0; sum0 = clib_mem_unaligned (&ip0->src_address, u64); sum0 = ip_csum_with_carry (sum0, clib_host_to_net_u32 (udp_len0 + (ip0->protocol << 16))); /* Invalidate possibly old checksum. */ udp0->checksum = 0; sum0 = ip_incremental_checksum_buffer (vm, p0, udp_offset, udp_len0, sum0); sum0 = ~ip_csum_fold (sum0); /* Zero checksum means checksumming disabled. */ sum0 = sum0 != 0 ? sum0 : 0xffff; udp0->checksum = sum0; } } } static void udp_pg_edit_function (pg_main_t * pg, pg_stream_t * s, pg_edit_group_t * g, u32 * packets, u32 n_packets) { switch (g->edit_function_opaque) { case UDP_PG_EDIT_LENGTH: udp_pg_edit_function_inline (pg, s, g, packets, n_packets, UDP_PG_EDIT_LENGTH); break; case UDP_PG_EDIT_CHECKSUM: udp_pg_edit_function_inline (pg, s, g, packets, n_packets, UDP_PG_EDIT_CHECKSUM); break; case UDP_PG_EDIT_CHECKSUM | UDP_PG_EDIT_LENGTH: udp_pg_edit_function_inline (pg, s, g, packets, n_packets, UDP_PG_EDIT_CHECKSUM | UDP_PG_EDIT_LENGTH); break; default: ASSERT (0); break; } } typedef struct { pg_edit_t src_port, dst_port; pg_edit_t length; pg_edit_t checksum; } pg_udp_header_t; static inline void pg_udp_header_init (pg_udp_header_t * p) { /* Initialize fields that are not bit fields in the IP header. */ #define _(f) pg_edit_init (&p->f, udp_header_t, f); _(src_port); _(dst_port); _(length); _(checksum); #undef _ } uword unformat_pg_udp_header (unformat_input_t * input, va_list * args) { pg_stream_t *s = va_arg (*args, pg_stream_t *); pg_udp_header_t *p; u32 group_index; p = pg_create_edit_group (s, sizeof (p[0]), sizeof (udp_header_t), &group_index); pg_udp_header_init (p); /* Defaults. */ p->checksum.type = PG_EDIT_UNSPECIFIED; p->length.type = PG_EDIT_UNSPECIFIED; if (!unformat (input, "UDP: %U -> %U", unformat_pg_edit, unformat_tcp_udp_port, &p->src_port, unformat_pg_edit, unformat_tcp_udp_port, &p->dst_port)) goto error; /* Parse options. */ while (1) { if (unformat (input, "length %U", unformat_pg_edit, unformat_pg_number, &p->length)) ; else if (unformat (input, "checksum %U", unformat_pg_edit, unformat_pg_number, &p->checksum)) ; /* Can't parse input: try next protocol level. */ else break; } { ip_main_t *im = &ip_main; u16 dst_port; tcp_udp_port_info_t *pi; /* For the pg format of applications over UDP local */ udp_dst_port_info_t *pi2 = NULL; pi = 0; if (p->dst_port.type == PG_EDIT_FIXED) { dst_port = pg_edit_get_value (&p->dst_port, PG_EDIT_LO); pi = ip_get_tcp_udp_port_info (im, dst_port); pi2 = udp_get_dst_port_info (&udp_main, dst_port, UDP_IP4); if (!pi2) pi2 = udp_get_dst_port_info (&udp_main, dst_port, UDP_IP6); } if (pi && pi->unformat_pg_edit && unformat_user (input, pi->unformat_pg_edit, s)) ; else if (pi2 && pi2->unformat_pg_edit && unformat_user (input, pi2->unformat_pg_edit, s)) ; else if (!unformat_user (input, unformat_pg_payload, s)) goto error; p = pg_get_edit_group (s, group_index); if (p->checksum.type == PG_EDIT_UNSPECIFIED || p->length.type == PG_EDIT_UNSPECIFIED) { pg_edit_group_t *g = pg_stream_get_group (s, group_index); g->edit_function = udp_pg_edit_function; g->edit_function_opaque = 0; if (p->checksum.type == PG_EDIT_UNSPECIFIED) g->edit_function_opaque |= UDP_PG_EDIT_CHECKSUM; if (p->length.type == PG_EDIT_UNSPECIFIED) g->edit_function_opaque |= UDP_PG_EDIT_LENGTH; } return 1; } error: /* Free up any edits we may have added. */ pg_free_edit_group (s); return 0; } /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */