From 7cd468a3d7dee7d6c92f69a0bb7061ae208ec727 Mon Sep 17 00:00:00 2001 From: Damjan Marion Date: Mon, 19 Dec 2016 23:05:39 +0100 Subject: Reorganize source tree to use single autotools instance Change-Id: I7b51f88292e057c6443b12224486f2d0c9f8ae23 Signed-off-by: Damjan Marion --- src/vnet/ip/ip4_packet.h | 384 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 384 insertions(+) create mode 100644 src/vnet/ip/ip4_packet.h (limited to 'src/vnet/ip/ip4_packet.h') diff --git a/src/vnet/ip/ip4_packet.h b/src/vnet/ip/ip4_packet.h new file mode 100644 index 00000000..8da788b4 --- /dev/null +++ b/src/vnet/ip/ip4_packet.h @@ -0,0 +1,384 @@ +/* + * 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. + */ +/* + * ip4/packet.h: ip4 packet format + * + * 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. + */ + +#ifndef included_ip4_packet_h +#define included_ip4_packet_h + +#include /* for ip_csum_t */ +#include /* for tcp_header_t */ +#include /* for clib_net_to_host_u16 */ + +/* IP4 address which can be accessed either as 4 bytes + or as a 32-bit number. */ +typedef union +{ + u8 data[4]; + u32 data_u32; + /* Aliases. */ + u8 as_u8[4]; + u32 as_u32; +} ip4_address_t; + +typedef struct +{ + /* IP address must be first for ip_interface_address_get_address() to work */ + ip4_address_t ip4_addr; + u32 fib_index; +} ip4_address_fib_t; + +always_inline void +ip4_addr_fib_init (ip4_address_fib_t * addr_fib, ip4_address_t * address, + u32 fib_index) +{ + clib_memcpy (&addr_fib->ip4_addr, address, sizeof (addr_fib->ip4_addr)); + addr_fib->fib_index = fib_index; +} + +/* (src,dst) pair of addresses as found in packet header. */ +typedef struct +{ + ip4_address_t src, dst; +} ip4_address_pair_t; + +/* If address is a valid netmask, return length of mask. */ +always_inline uword +ip4_address_netmask_length (ip4_address_t * a) +{ + uword result = 0; + uword i; + for (i = 0; i < ARRAY_LEN (a->as_u8); i++) + { + switch (a->as_u8[i]) + { + case 0xff: + result += 8; + break; + case 0xfe: + result += 7; + goto done; + case 0xfc: + result += 6; + goto done; + case 0xf8: + result += 5; + goto done; + case 0xf0: + result += 4; + goto done; + case 0xe0: + result += 3; + goto done; + case 0xc0: + result += 2; + goto done; + case 0x80: + result += 1; + goto done; + case 0x00: + result += 0; + goto done; + default: + /* Not a valid netmask mask. */ + return ~0; + } + } +done: + return result; +} + +typedef union +{ + struct + { + /* 4 bit packet length (in 32bit units) and version VVVVLLLL. + e.g. for packets w/ no options ip_version_and_header_length == 0x45. */ + u8 ip_version_and_header_length; + + /* Type of service. */ + u8 tos; + + /* Total layer 3 packet length including this header. */ + u16 length; + + /* Fragmentation ID. */ + u16 fragment_id; + + /* 3 bits of flags and 13 bits of fragment offset (in units + of 8 byte quantities). */ + u16 flags_and_fragment_offset; +#define IP4_HEADER_FLAG_MORE_FRAGMENTS (1 << 13) +#define IP4_HEADER_FLAG_DONT_FRAGMENT (1 << 14) +#define IP4_HEADER_FLAG_CONGESTION (1 << 15) + + /* Time to live decremented by router at each hop. */ + u8 ttl; + + /* Next level protocol packet. */ + u8 protocol; + + /* Checksum. */ + u16 checksum; + + /* Source and destination address. */ + union + { + struct + { + ip4_address_t src_address, dst_address; + }; + ip4_address_pair_t address_pair; + }; + }; + + /* For checksumming we'll want to access IP header in word sized chunks. */ + /* For 64 bit machines. */ + /* *INDENT-OFF* */ + CLIB_PACKED (struct { + u64 checksum_data_64[2]; + u32 checksum_data_64_32[1]; + }); + /* *INDENT-ON* */ + + /* For 32 bit machines. */ + /* *INDENT-OFF* */ + CLIB_PACKED (struct { + u32 checksum_data_32[5]; + }); + /* *INDENT-ON* */ +} ip4_header_t; + +/* Value of ip_version_and_header_length for packets w/o options. */ +#define IP4_VERSION_AND_HEADER_LENGTH_NO_OPTIONS \ + ((4 << 4) | (sizeof (ip4_header_t) / sizeof (u32))) + +always_inline int +ip4_get_fragment_offset (ip4_header_t * i) +{ + return clib_net_to_host_u16 (i->flags_and_fragment_offset) & 0x1fff; +} + +always_inline int +ip4_get_fragment_more (ip4_header_t * i) +{ + return clib_net_to_host_u16 (i->flags_and_fragment_offset) & + IP4_HEADER_FLAG_MORE_FRAGMENTS; +} + +always_inline int +ip4_is_fragment (ip4_header_t * i) +{ + return (i->flags_and_fragment_offset & + clib_net_to_host_u16 (0x1fff | IP4_HEADER_FLAG_MORE_FRAGMENTS)); +} + +always_inline int +ip4_is_first_fragment (ip4_header_t * i) +{ + return (i->flags_and_fragment_offset & + clib_net_to_host_u16 (0x1fff | IP4_HEADER_FLAG_MORE_FRAGMENTS)) == + clib_net_to_host_u16 (IP4_HEADER_FLAG_MORE_FRAGMENTS); +} + +/* Fragment offset in bytes. */ +always_inline int +ip4_get_fragment_offset_bytes (ip4_header_t * i) +{ + return 8 * ip4_get_fragment_offset (i); +} + +always_inline int +ip4_header_bytes (ip4_header_t * i) +{ + return sizeof (u32) * (i->ip_version_and_header_length & 0xf); +} + +always_inline void * +ip4_next_header (ip4_header_t * i) +{ + return (void *) i + ip4_header_bytes (i); +} + +always_inline u16 +ip4_header_checksum (ip4_header_t * i) +{ + u16 save, csum; + ip_csum_t sum; + + save = i->checksum; + i->checksum = 0; + sum = ip_incremental_checksum (0, i, ip4_header_bytes (i)); + csum = ~ip_csum_fold (sum); + + i->checksum = save; + + /* Make checksum agree for special case where either + 0 or 0xffff would give same 1s complement sum. */ + if (csum == 0 && save == 0xffff) + csum = save; + + return csum; +} + +static inline uword +ip4_header_checksum_is_valid (ip4_header_t * i) +{ + return i->checksum == ip4_header_checksum (i); +} + +#define ip4_partial_header_checksum_x1(ip0,sum0) \ +do { \ + if (BITS (ip_csum_t) > 32) \ + { \ + sum0 = ip0->checksum_data_64[0]; \ + sum0 = ip_csum_with_carry (sum0, ip0->checksum_data_64[1]); \ + sum0 = ip_csum_with_carry (sum0, ip0->checksum_data_64_32[0]); \ + } \ + else \ + { \ + sum0 = ip0->checksum_data_32[0]; \ + sum0 = ip_csum_with_carry (sum0, ip0->checksum_data_32[1]); \ + sum0 = ip_csum_with_carry (sum0, ip0->checksum_data_32[2]); \ + sum0 = ip_csum_with_carry (sum0, ip0->checksum_data_32[3]); \ + sum0 = ip_csum_with_carry (sum0, ip0->checksum_data_32[4]); \ + } \ +} while (0) + +#define ip4_partial_header_checksum_x2(ip0,ip1,sum0,sum1) \ +do { \ + if (BITS (ip_csum_t) > 32) \ + { \ + sum0 = ip0->checksum_data_64[0]; \ + sum1 = ip1->checksum_data_64[0]; \ + sum0 = ip_csum_with_carry (sum0, ip0->checksum_data_64[1]); \ + sum1 = ip_csum_with_carry (sum1, ip1->checksum_data_64[1]); \ + sum0 = ip_csum_with_carry (sum0, ip0->checksum_data_64_32[0]); \ + sum1 = ip_csum_with_carry (sum1, ip1->checksum_data_64_32[0]); \ + } \ + else \ + { \ + sum0 = ip0->checksum_data_32[0]; \ + sum1 = ip1->checksum_data_32[0]; \ + sum0 = ip_csum_with_carry (sum0, ip0->checksum_data_32[1]); \ + sum1 = ip_csum_with_carry (sum1, ip1->checksum_data_32[1]); \ + sum0 = ip_csum_with_carry (sum0, ip0->checksum_data_32[2]); \ + sum1 = ip_csum_with_carry (sum1, ip1->checksum_data_32[2]); \ + sum0 = ip_csum_with_carry (sum0, ip0->checksum_data_32[3]); \ + sum1 = ip_csum_with_carry (sum1, ip1->checksum_data_32[3]); \ + sum0 = ip_csum_with_carry (sum0, ip0->checksum_data_32[4]); \ + sum1 = ip_csum_with_carry (sum1, ip1->checksum_data_32[4]); \ + } \ +} while (0) + +always_inline uword +ip4_address_is_multicast (ip4_address_t * a) +{ + return (a->data[0] & 0xf0) == 0xe0; +} + +always_inline void +ip4_multicast_address_set_for_group (ip4_address_t * a, + ip_multicast_group_t g) +{ + ASSERT ((u32) g < (1 << 28)); + a->as_u32 = clib_host_to_net_u32 ((0xe << 28) + g); +} + +always_inline void +ip4_multicast_ethernet_address (u8 * ethernet_address, ip4_address_t * a) +{ + u8 *d = a->as_u8; + + ethernet_address[0] = 0x01; + ethernet_address[1] = 0x00; + ethernet_address[2] = 0x5e; + ethernet_address[3] = d[1] & 0x7f; + ethernet_address[4] = d[2]; + ethernet_address[5] = d[3]; +} + +always_inline void +ip4_tcp_reply_x1 (ip4_header_t * ip0, tcp_header_t * tcp0) +{ + u32 src0, dst0; + + src0 = ip0->src_address.data_u32; + dst0 = ip0->dst_address.data_u32; + ip0->src_address.data_u32 = dst0; + ip0->dst_address.data_u32 = src0; + + src0 = tcp0->ports.src; + dst0 = tcp0->ports.dst; + tcp0->ports.src = dst0; + tcp0->ports.dst = src0; +} + +always_inline void +ip4_tcp_reply_x2 (ip4_header_t * ip0, ip4_header_t * ip1, + tcp_header_t * tcp0, tcp_header_t * tcp1) +{ + u32 src0, dst0, src1, dst1; + + src0 = ip0->src_address.data_u32; + src1 = ip1->src_address.data_u32; + dst0 = ip0->dst_address.data_u32; + dst1 = ip1->dst_address.data_u32; + ip0->src_address.data_u32 = dst0; + ip1->src_address.data_u32 = dst1; + ip0->dst_address.data_u32 = src0; + ip1->dst_address.data_u32 = src1; + + src0 = tcp0->ports.src; + src1 = tcp1->ports.src; + dst0 = tcp0->ports.dst; + dst1 = tcp1->ports.dst; + tcp0->ports.src = dst0; + tcp1->ports.src = dst1; + tcp0->ports.dst = src0; + tcp1->ports.dst = src1; +} + +#endif /* included_ip4_packet_h */ + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ -- cgit 1.2.3-korg