+++ /dev/null
-/*
- * 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 <vnet/ip/ip_packet.h> /* for ip_csum_t */
-#include <vnet/ip/tcp_packet.h> /* for tcp_header_t */
-#include <vppinfra/byte_order.h> /* 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:
- */
Code Review / vpp.git / blobdiff