[Feature][ZXW-237]merge P54U03 version
Only Configure: No
Affected branch: master
Affected module: unknow
Is it affected on both ZXIC and MTK: only ZXIC
Self-test: Yes
Doc Update: No
Change-Id: Id39ef8b992af691eab09c01d4ea26da89e5f4049
diff --git a/ap/app/clatd/ipv4.c b/ap/app/clatd/ipv4.c
new file mode 100755
index 0000000..406cc42
--- /dev/null
+++ b/ap/app/clatd/ipv4.c
@@ -0,0 +1,157 @@
+/*
+ * 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.
+ *
+ * ipv4.c - takes ipv4 packets, finds their headers, and then calls translation functions on them
+ */
+#include <string.h>
+
+#include "translate.h"
+#include "checksum.h"
+#include "logging.h"
+#include "debug.h"
+#include "dump.h"
+
+/* function: icmp_packet
+ * translates an icmp packet
+ * out - output packet
+ * icmp - pointer to icmp header in packet
+ * checksum - pseudo-header checksum
+ * len - size of ip payload
+ * returns: the highest position in the output clat_packet that's filled in
+ */
+int icmp_packet(clat_packet out, clat_packet_index pos, const struct icmphdr *icmp,
+ uint32_t checksum, size_t len) {
+ const uint8_t *payload;
+ size_t payload_size;
+
+ if(len < sizeof(struct icmphdr)) {
+ logmsg_dbg(ANDROID_LOG_ERROR, "icmp_packet/(too small)");
+ return 0;
+ }
+
+ payload = (const uint8_t *) (icmp + 1);
+ payload_size = len - sizeof(struct icmphdr);
+
+ return icmp_to_icmp6(out, pos, icmp, checksum, payload, payload_size);
+}
+
+/* function: ipv4_packet
+ * translates an ipv4 packet
+ * out - output packet
+ * packet - packet data
+ * len - size of packet
+ * returns: the highest position in the output clat_packet that's filled in
+ */
+int ipv4_packet(clat_packet out, clat_packet_index pos, const uint8_t *packet, size_t len, struct clat_icmp_frag *icmp_frag) {
+ const struct iphdr *header = (struct iphdr *) packet;
+ struct ip6_hdr *ip6_targ = (struct ip6_hdr *) out[pos].iov_base;
+ struct ip6_frag *frag_hdr;
+ size_t frag_hdr_len;
+ uint8_t nxthdr;
+ const uint8_t *next_header;
+ size_t len_left;
+ uint32_t old_sum, new_sum;
+ int iov_len;
+
+ if(len < sizeof(struct iphdr)) {
+ logmsg_dbg(ANDROID_LOG_ERROR, "ip_packet/too short for an ip header");
+ return 0;
+ }
+
+ if(header->ihl < 5) {
+ logmsg_dbg(ANDROID_LOG_ERROR, "ip_packet/ip header length set to less than 5: %x", header->ihl);
+ return 0;
+ }
+
+ if((size_t) header->ihl * 4 > len) { // ip header length larger than entire packet
+ logmsg_dbg(ANDROID_LOG_ERROR, "ip_packet/ip header length set too large: %x", header->ihl);
+ return 0;
+ }
+
+ if(header->version != 4) {
+ logmsg_dbg(ANDROID_LOG_ERROR, "ip_packet/ip header version not 4: %x", header->version);
+ return 0;
+ }
+
+ /* rfc6145 - If any IPv4 options are present in the IPv4 packet, they MUST be
+ * ignored and the packet translated normally; there is no attempt to
+ * translate the options.
+ */
+
+ next_header = packet + header->ihl*4;
+ len_left = len - header->ihl * 4;
+
+ nxthdr = header->protocol;
+ if (nxthdr == IPPROTO_ICMP) {
+ // ICMP and ICMPv6 have different protocol numbers.
+ nxthdr = IPPROTO_ICMPV6;
+ }
+
+ /* Fill in the IPv6 header. We need to do this before we translate the packet because TCP and
+ * UDP include parts of the IP header in the checksum. Set the length to zero because we don't
+ * know it yet.
+ */
+ fill_ip6_header(ip6_targ, 0, nxthdr, header);
+ out[pos].iov_len = sizeof(struct ip6_hdr);
+
+ /* Calculate the pseudo-header checksum.
+ * Technically, the length that is used in the pseudo-header checksum is the transport layer
+ * length, which is not the same as len_left in the case of fragmented packets. But since
+ * translation does not change the transport layer length, the checksum is unaffected.
+ */
+ old_sum = ipv4_pseudo_header_checksum(header, len_left);
+ new_sum = ipv6_pseudo_header_checksum(ip6_targ, len_left, nxthdr);
+
+ // If the IPv4 packet is fragmented, add a Fragment header.
+ frag_hdr = (struct ip6_frag *) out[pos + 1].iov_base;
+ frag_hdr_len = maybe_fill_frag_header(frag_hdr, ip6_targ, header);
+ out[pos + 1].iov_len = frag_hdr_len;
+
+ if (frag_hdr_len && frag_hdr->ip6f_offlg & IP6F_OFF_MASK) {
+ uint16_t frag_len = ((ntohs(header->frag_off))&IP_OFFMASK)<< 3;
+ if(icmp_frag && frag_len > 0 && ((ntohs(header->frag_off)) & IP_MF) == 0 && (nxthdr == IPPROTO_ICMPV6)){
+ icmp_frag->ip_len = len_left + frag_len;
+ icmp_frag->ip_id = header->id;
+ icmp_frag->flag = 2;
+ }
+ // Non-first fragment. Copy the rest of the packet as is.
+ iov_len = generic_packet(out, pos + 2, next_header, len_left);
+ } else if (nxthdr == IPPROTO_ICMPV6) {
+ if(icmp_frag && ((ntohs(header->frag_off)) & (IP_MF|IP_OFFMASK)) == IP_MF){
+ icmp_frag->ip_len = len_left;
+ icmp_frag->ip_id = header->id;
+ icmp_frag->flag = 1;
+ }
+ iov_len = icmp_packet(out, pos + 2, (const struct icmphdr *) next_header, new_sum, len_left);
+ } else if (nxthdr == IPPROTO_TCP) {
+ iov_len = tcp_packet(out, pos + 2, (const struct tcphdr *) next_header, old_sum, new_sum,
+ len_left);
+ } else if (nxthdr == IPPROTO_UDP) {
+ iov_len = udp_packet(out, pos + 2, (const struct udphdr *) next_header, old_sum, new_sum,
+ len_left);
+ } else if (nxthdr == IPPROTO_GRE) {
+ iov_len = generic_packet(out, pos + 2, next_header, len_left);
+ } else {
+#if CLAT_DEBUG
+ logmsg_dbg(ANDROID_LOG_ERROR, "ip_packet/unknown protocol: %x",header->protocol);
+ logcat_hexdump("ipv4/protocol", packet, len);
+#endif
+ return 0;
+ }
+
+ // Set the length.
+ ip6_targ->ip6_plen = htons(packet_length(out, pos));
+ return iov_len;
+}