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Code Issues Releases Wiki Activity

Native calculate receive window

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This commit is contained in:
M66B 2016-02-08 21:59:24 +01:00
parent b3458e3bd9
commit da99bca7a1
2 changed files with 13 additions and 9 deletions
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20
app/src/main/jni/netguard/netguard.c
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@ -28,6 +28,7 @@
#include <pthread.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <dlfcn.h>
@ -2455,8 +2456,9 @@ jboolean handle_tcp(const struct arguments *args,
rst.source = tcphdr->source;
rst.dest = tcphdr->dest;
write_rst(args, &rst);
rst.socket = -1;
write_rst(args, &rst);
return 0;
}
}
@ -3080,12 +3082,14 @@ ssize_t write_tcp(const struct arguments *args, const struct tcp_session *cur,
csum = calc_checksum(0, (uint8_t *) &pseudo, sizeof(struct ip6_hdr_pseudo));
}
/*
int send_buf;
int olen = sizeof(send_buf);
if (!getsockopt(cur->socket, SOL_SOCKET, SO_SNDBUF, &send_buf, &olen))
log_android(ANDROID_LOG_WARN, "Send buffer socket %d size %d", cur->socket, send_buf);
*/
int unsent = 0;
uint16_t window = TCP_RECV_WINDOW;
if (cur->socket >= 0) {
if (ioctl(cur->socket, SIOCOUTQ, &unsent))
log_android(ANDROID_LOG_WARN, "ioctl SIOCOUTQ %d: %s", errno, strerror(errno));
else
window = (uint16_t) (unsent < TCP_RECV_WINDOW ? TCP_RECV_WINDOW - unsent : 1);
}
// Build TCP header
memset(tcp, 0, sizeof(struct tcphdr));
@ -3098,7 +3102,7 @@ ssize_t write_tcp(const struct arguments *args, const struct tcp_session *cur,
tcp->ack = (__u16) ack;
tcp->fin = (__u16) fin;
tcp->rst = (__u16) rst;
tcp->window = htons(TCP_RECV_WINDOW);
tcp->window = htons(window);
tcp->urg_ptr;
if (!tcp->ack)

2
app/src/main/jni/netguard/netguard.h
View file

@ -17,7 +17,7 @@
#define UDP_KEEP_TIMEOUT 60 // seconds
#define UDP_TIMEOUT_SCALE 25
#define TCP_RECV_WINDOW 16384 // bytes
#define TCP_RECV_WINDOW 16384 // bytes (maximum)
#define TCP_SEND_WINDOW 16384 // bytes (maximum)
#define TCP_INIT_TIMEOUT 30 // seconds ~net.inet.tcp.keepinit
#define TCP_IDLE_TIMEOUT 300 // seconds ~net.inet.tcp.keepidle