Move checksum code from clatd to libnetutils.
This allows us to use it elsewhere, for example, in netd.
Bug: 65674744
Test: builds, boots
Test: atest clatd_test clatd_microbenchmark
Change-Id: Ic2cea1cd658ffd23ba9fbe45cb6b28e3b5312005
diff --git a/Android.bp b/Android.bp
index 82295f3..e0eeb2e 100644
--- a/Android.bp
+++ b/Android.bp
@@ -21,7 +21,6 @@
filegroup {
name: "clatd_common",
srcs: [
- "checksum.c",
"config.c",
"clatd.c",
"dns64.c",
@@ -90,7 +89,9 @@
defaults: ["clatd_defaults"],
srcs: [
"clatd_microbenchmark.c",
- "checksum.c",
"tun.c",
],
+ shared_libs: [
+ "libnetutils",
+ ],
}
diff --git a/checksum.c b/checksum.c
deleted file mode 100644
index 11b5149..0000000
--- a/checksum.c
+++ /dev/null
@@ -1,142 +0,0 @@
-/*
- * Copyright 2011 Daniel Drown
- *
- * 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.
- *
- * checksum.c - ipv4/ipv6 checksum calculation
- */
-#include <netinet/icmp6.h>
-#include <netinet/in.h>
-#include <netinet/ip.h>
-#include <netinet/ip6.h>
-#include <netinet/ip_icmp.h>
-#include <netinet/tcp.h>
-#include <netinet/udp.h>
-
-#include "checksum.h"
-
-/* function: ip_checksum_add
- * adds data to a checksum
- * current - the current checksum (or 0 to start a new checksum)
- * data - the data to add to the checksum
- * len - length of data
- */
-uint32_t ip_checksum_add(uint32_t current, const void *data, int len) {
- uint32_t checksum = current;
- int left = len;
- const uint16_t *data_16 = data;
-
- while (left > 1) {
- checksum += *data_16;
- data_16++;
- left -= 2;
- }
- if (left) {
- checksum += *(uint8_t *)data_16;
- }
-
- return checksum;
-}
-
-/* function: ip_checksum_fold
- * folds a 32-bit partial checksum into 16 bits
- * temp_sum - sum from ip_checksum_add
- * returns: the folded checksum in network byte order
- */
-uint16_t ip_checksum_fold(uint32_t temp_sum) {
- while (temp_sum > 0xffff) {
- temp_sum = (temp_sum >> 16) + (temp_sum & 0xFFFF);
- }
- return temp_sum;
-}
-
-/* function: ip_checksum_finish
- * folds and closes the checksum
- * temp_sum - sum from ip_checksum_add
- * returns: a header checksum value in network byte order
- */
-uint16_t ip_checksum_finish(uint32_t temp_sum) { return ~ip_checksum_fold(temp_sum); }
-
-/* function: ip_checksum
- * combined ip_checksum_add and ip_checksum_finish
- * data - data to checksum
- * len - length of data
- */
-uint16_t ip_checksum(const void *data, int len) {
- uint32_t temp_sum;
-
- temp_sum = ip_checksum_add(0, data, len);
- return ip_checksum_finish(temp_sum);
-}
-
-/* function: ipv6_pseudo_header_checksum
- * calculate the pseudo header checksum for use in tcp/udp/icmp headers
- * ip6 - the ipv6 header
- * len - the transport length (transport header + payload)
- * protocol - the transport layer protocol, can be different from ip6->ip6_nxt for fragments
- */
-uint32_t ipv6_pseudo_header_checksum(const struct ip6_hdr *ip6, uint16_t len, uint8_t protocol) {
- uint32_t checksum_len, checksum_next;
- checksum_len = htonl((uint32_t)len);
- checksum_next = htonl(protocol);
-
- uint32_t current = 0;
-
- current = ip_checksum_add(current, &(ip6->ip6_src), sizeof(struct in6_addr));
- current = ip_checksum_add(current, &(ip6->ip6_dst), sizeof(struct in6_addr));
- current = ip_checksum_add(current, &checksum_len, sizeof(checksum_len));
- current = ip_checksum_add(current, &checksum_next, sizeof(checksum_next));
-
- return current;
-}
-
-/* function: ipv4_pseudo_header_checksum
- * calculate the pseudo header checksum for use in tcp/udp headers
- * ip - the ipv4 header
- * len - the transport length (transport header + payload)
- */
-uint32_t ipv4_pseudo_header_checksum(const struct iphdr *ip, uint16_t len) {
- uint16_t temp_protocol, temp_length;
-
- temp_protocol = htons(ip->protocol);
- temp_length = htons(len);
-
- uint32_t current = 0;
-
- current = ip_checksum_add(current, &(ip->saddr), sizeof(uint32_t));
- current = ip_checksum_add(current, &(ip->daddr), sizeof(uint32_t));
- current = ip_checksum_add(current, &temp_protocol, sizeof(uint16_t));
- current = ip_checksum_add(current, &temp_length, sizeof(uint16_t));
-
- return current;
-}
-
-/* function: ip_checksum_adjust
- * calculates a new checksum given a previous checksum and the old and new pseudo-header checksums
- * checksum - the header checksum in the original packet in network byte order
- * old_hdr_sum - the pseudo-header checksum of the original packet
- * new_hdr_sum - the pseudo-header checksum of the translated packet
- * returns: the new header checksum in network byte order
- */
-uint16_t ip_checksum_adjust(uint16_t checksum, uint32_t old_hdr_sum, uint32_t new_hdr_sum) {
- // Algorithm suggested in RFC 1624.
- // http://tools.ietf.org/html/rfc1624#section-3
- checksum = ~checksum;
- uint16_t folded_sum = ip_checksum_fold(checksum + new_hdr_sum);
- uint16_t folded_old = ip_checksum_fold(old_hdr_sum);
- if (folded_sum > folded_old) {
- return ~(folded_sum - folded_old);
- } else {
- return ~(folded_sum - folded_old - 1); // end-around borrow
- }
-}
diff --git a/checksum.h b/checksum.h
deleted file mode 100644
index 669b42c..0000000
--- a/checksum.h
+++ /dev/null
@@ -1,34 +0,0 @@
-/*
- * Copyright 2011 Daniel Drown
- *
- * 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.
- *
- * checksum.h - checksum functions
- */
-#ifndef __CHECKSUM_H__
-#define __CHECKSUM_H__
-
-#include <netinet/ip.h>
-#include <netinet/ip6.h>
-#include <stdint.h>
-
-uint32_t ip_checksum_add(uint32_t current, const void *data, int len);
-uint16_t ip_checksum_finish(uint32_t temp_sum);
-uint16_t ip_checksum(const void *data, int len);
-
-uint32_t ipv6_pseudo_header_checksum(const struct ip6_hdr *ip6, uint16_t len, uint8_t protocol);
-uint32_t ipv4_pseudo_header_checksum(const struct iphdr *ip, uint16_t len);
-
-uint16_t ip_checksum_adjust(uint16_t checksum, uint32_t old_hdr_sum, uint32_t new_hdr_sum);
-
-#endif /* __CHECKSUM_H__ */
diff --git a/clatd_microbenchmark.c b/clatd_microbenchmark.c
index 83be006..91b0996 100644
--- a/clatd_microbenchmark.c
+++ b/clatd_microbenchmark.c
@@ -41,7 +41,7 @@
#include <time.h>
#include <unistd.h>
-#include "checksum.h"
+#include "netutils/checksum.h"
#include "tun.h"
#define DEVICENAME "clat4"
diff --git a/clatd_test.cpp b/clatd_test.cpp
index 7705a36..8e49824 100644
--- a/clatd_test.cpp
+++ b/clatd_test.cpp
@@ -29,10 +29,10 @@
#include "tun_interface.h"
extern "C" {
-#include "checksum.h"
#include "clatd.h"
#include "config.h"
#include "getaddr.h"
+#include "netutils/checksum.h"
#include "translate.h"
#include "tun.h"
}
diff --git a/config.c b/config.c
index 91a65fb..5a9d599 100644
--- a/config.c
+++ b/config.c
@@ -25,9 +25,9 @@
#include <unistd.h>
#include <cutils/config_utils.h>
+#include <netutils/checksum.h>
#include <netutils/ifc.h>
-#include "checksum.h"
#include "clatd.h"
#include "config.h"
#include "dns64.h"
diff --git a/dump.c b/dump.c
index 2c948ff..28db13f 100644
--- a/dump.c
+++ b/dump.c
@@ -29,7 +29,8 @@
#include <netinet/tcp.h>
#include <netinet/udp.h>
-#include "checksum.h"
+#include "netutils/checksum.h"
+
#include "clatd.h"
#include "debug.h"
#include "logging.h"
diff --git a/ipv4.c b/ipv4.c
index fce400f..56d83ac 100644
--- a/ipv4.c
+++ b/ipv4.c
@@ -17,7 +17,8 @@
*/
#include <string.h>
-#include "checksum.h"
+#include "netutils/checksum.h"
+
#include "debug.h"
#include "dump.h"
#include "logging.h"
diff --git a/ipv6.c b/ipv6.c
index a11dd1a..c9b547e 100644
--- a/ipv6.c
+++ b/ipv6.c
@@ -19,7 +19,8 @@
#include <arpa/inet.h>
-#include "checksum.h"
+#include "netutils/checksum.h"
+
#include "config.h"
#include "debug.h"
#include "dump.h"
diff --git a/translate.c b/translate.c
index df3d020..1632753 100644
--- a/translate.c
+++ b/translate.c
@@ -17,7 +17,8 @@
*/
#include <string.h>
-#include "checksum.h"
+#include "netutils/checksum.h"
+
#include "clatd.h"
#include "common.h"
#include "config.h"
