tpws: segmentation failure warning and fix

5 months ago · 06147836d0
5 changed files with 186 additions and 102 deletions
--- a/tpws/helpers.c
+++ b/tpws/helpers.c
@ -11,6 +11,10 @@
 #include <sys/stat.h>
 #include <libgen.h>

+#ifdef __linux__
+#include <linux/tcp.h>
+#endif
+
 #ifdef __ANDROID__
 #include "andr/ifaddrs.h"
 #else
@ -34,9 +38,9 @@ static int cmp_size_t(const void * a, const void * b)
 {
 	return *(size_t*)a < *(size_t*)b ? -1 : *(size_t*)a > *(size_t*)b;
 }
-void qsort_size_t(size_t *array,size_t ct)
+void qsort_size_t(size_t *array, size_t ct)
 {
-	qsort(array,ct,sizeof(*array),cmp_size_t);
+	qsort(array, ct, sizeof(*array), cmp_size_t);
 }


@ -48,10 +52,10 @@ void rtrim(char *s)

 void replace_char(char *s, char from, char to)
 {
-	for(;*s;s++) if (*s==from) *s=to;
+	for (; *s; s++) if (*s == from) *s = to;
 }

-char *strncasestr(const char *s,const char *find, size_t slen)
+char *strncasestr(const char *s, const char *find, size_t slen)
 {
 	char c, sc;
 	size_t len;
@ -92,9 +96,9 @@ bool load_file(const char *filename, void *buffer, size_t *buffer_size)

 bool append_to_list_file(const char *filename, const char *s)
 {
-	FILE *F = fopen(filename,"at");
+	FILE *F = fopen(filename, "at");
 	if (!F) return false;
-	bool bOK = fprintf(F,"%s\n",s)>0;
+	bool bOK = fprintf(F, "%s\n", s) > 0;
 	fclose(F);
 	return bOK;
 }
@ -102,7 +106,7 @@ bool append_to_list_file(const char *filename, const char *s)
 void ntop46(const struct sockaddr *sa, char *str, size_t len)
 {
 	if (!len) return;
-	*str=0;
+	*str = 0;
 	switch (sa->sa_family)
 	{
 	case AF_INET:
@ -112,50 +116,50 @@ void ntop46(const struct sockaddr *sa, char *str, size_t len)
 		inet_ntop(sa->sa_family, &((struct sockaddr_in6*)sa)->sin6_addr, str, len);
 		break;
 	default:
-		snprintf(str,len,"UNKNOWN_FAMILY_%d",sa->sa_family);
+		snprintf(str, len, "UNKNOWN_FAMILY_%d", sa->sa_family);
 	}
 }
 void ntop46_port(const struct sockaddr *sa, char *str, size_t len)
 {
 	char ip[40];
-	ntop46(sa,ip,sizeof(ip));
+	ntop46(sa, ip, sizeof(ip));
 	switch (sa->sa_family)
 	{
 	case AF_INET:
-		snprintf(str,len,"%s:%u",ip,ntohs(((struct sockaddr_in*)sa)->sin_port));
+		snprintf(str, len, "%s:%u", ip, ntohs(((struct sockaddr_in*)sa)->sin_port));
 		break;
 	case AF_INET6:
-		snprintf(str,len,"[%s]:%u",ip,ntohs(((struct sockaddr_in6*)sa)->sin6_port));
+		snprintf(str, len, "[%s]:%u", ip, ntohs(((struct sockaddr_in6*)sa)->sin6_port));
 		break;
 	default:
-		snprintf(str,len,"%s",ip);
+		snprintf(str, len, "%s", ip);
 	}
 }
 void print_sockaddr(const struct sockaddr *sa)
 {
 	char ip_port[48];

-	ntop46_port(sa,ip_port,sizeof(ip_port));
-	printf("%s",ip_port);
+	ntop46_port(sa, ip_port, sizeof(ip_port));
+	printf("%s", ip_port);
 }

 // -1 = error,  0 = not local, 1 = local
 bool check_local_ip(const struct sockaddr *saddr)
 {
-	struct ifaddrs *addrs,*a;
+	struct ifaddrs *addrs, *a;

 	if (is_localnet(saddr))
 		return true;

-	if (getifaddrs(&addrs)<0) return false;
+	if (getifaddrs(&addrs) < 0) return false;
 	a = addrs;

-	bool bres=false;
+	bool bres = false;
 	while (a)
 	{
-		if (a->ifa_addr && sacmp(a->ifa_addr,saddr))
+		if (a->ifa_addr && sacmp(a->ifa_addr, saddr))
 		{
-			bres=true;
+			bres = true;
 			break;
 		}
 		a = a->ifa_next;
@ -177,7 +181,7 @@ void print_addrinfo(const struct addrinfo *ai)
 			break;
 		case AF_INET6:
 			if (inet_ntop(ai->ai_family, &((struct sockaddr_in6*)ai->ai_addr)->sin6_addr, str, sizeof(str)))
-				printf( "%s\n", str);
+				printf("%s\n", str);
 			break;
 		}
 		ai = ai->ai_next;
@ -189,23 +193,23 @@ void print_addrinfo(const struct addrinfo *ai)
 bool saismapped(const struct sockaddr_in6 *sa)
 {
 	// ::ffff:1.2.3.4
-	return !memcmp(sa->sin6_addr.s6_addr,"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\xff",12);
+	return !memcmp(sa->sin6_addr.s6_addr, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\xff", 12);
 }
-bool samappedcmp(const struct sockaddr_in *sa1,const struct sockaddr_in6 *sa2)
+bool samappedcmp(const struct sockaddr_in *sa1, const struct sockaddr_in6 *sa2)
 {
-	return saismapped(sa2) && !memcmp(sa2->sin6_addr.s6_addr+12,&sa1->sin_addr.s_addr,4);
+	return saismapped(sa2) && !memcmp(sa2->sin6_addr.s6_addr + 12, &sa1->sin_addr.s_addr, 4);
 }
-bool sacmp(const struct sockaddr *sa1,const struct sockaddr *sa2)
+bool sacmp(const struct sockaddr *sa1, const struct sockaddr *sa2)
 {
-	return (sa1->sa_family==AF_INET && sa2->sa_family==AF_INET && !memcmp(&((struct sockaddr_in*)sa1)->sin_addr,&((struct sockaddr_in*)sa2)->sin_addr,sizeof(struct in_addr))) ||
-		(sa1->sa_family==AF_INET6 && sa2->sa_family==AF_INET6 && !memcmp(&((struct sockaddr_in6*)sa1)->sin6_addr,&((struct sockaddr_in6*)sa2)->sin6_addr,sizeof(struct in6_addr))) ||
-		(sa1->sa_family==AF_INET && sa2->sa_family==AF_INET6 && samappedcmp((struct sockaddr_in*)sa1,(struct sockaddr_in6*)sa2)) ||
-		(sa1->sa_family==AF_INET6 && sa2->sa_family==AF_INET && samappedcmp((struct sockaddr_in*)sa2,(struct sockaddr_in6*)sa1));
+	return (sa1->sa_family == AF_INET && sa2->sa_family == AF_INET && !memcmp(&((struct sockaddr_in*)sa1)->sin_addr, &((struct sockaddr_in*)sa2)->sin_addr, sizeof(struct in_addr))) ||
+		(sa1->sa_family == AF_INET6 && sa2->sa_family == AF_INET6 && !memcmp(&((struct sockaddr_in6*)sa1)->sin6_addr, &((struct sockaddr_in6*)sa2)->sin6_addr, sizeof(struct in6_addr))) ||
+		(sa1->sa_family == AF_INET && sa2->sa_family == AF_INET6 && samappedcmp((struct sockaddr_in*)sa1, (struct sockaddr_in6*)sa2)) ||
+		(sa1->sa_family == AF_INET6 && sa2->sa_family == AF_INET && samappedcmp((struct sockaddr_in*)sa2, (struct sockaddr_in6*)sa1));
 }
 uint16_t saport(const struct sockaddr *sa)
 {
-	return htons(sa->sa_family==AF_INET ? ((struct sockaddr_in*)sa)->sin_port :
-		     sa->sa_family==AF_INET6 ? ((struct sockaddr_in6*)sa)->sin6_port : 0);
+	return htons(sa->sa_family == AF_INET ? ((struct sockaddr_in*)sa)->sin_port :
+		sa->sa_family == AF_INET6 ? ((struct sockaddr_in6*)sa)->sin6_port : 0);
 }
 bool saconvmapped(struct sockaddr_storage *a)
 {
@ -223,13 +227,13 @@ bool saconvmapped(struct sockaddr_storage *a)

 void sacopy(struct sockaddr_storage *sa_dest, const struct sockaddr *sa)
 {
-	switch(sa->sa_family)
+	switch (sa->sa_family)
 	{
 	case AF_INET:
-			memcpy(sa_dest,sa,sizeof(struct sockaddr_in));
+		memcpy(sa_dest, sa, sizeof(struct sockaddr_in));
 		break;
 	case AF_INET6:
-			memcpy(sa_dest,sa,sizeof(struct sockaddr_in6));
+		memcpy(sa_dest, sa, sizeof(struct sockaddr_in6));
 		break;
 	default:
 		sa_dest->ss_family = 0;
@ -243,9 +247,9 @@ void sa46copy(sockaddr_in46 *sa_dest, const struct sockaddr *sa)
 bool is_localnet(const struct sockaddr *a)
 {
 	// match 127.0.0.0/8, 0.0.0.0, ::1, ::0, :ffff:127.0.0.0/104, :ffff:0.0.0.0
-	return (a->sa_family==AF_INET && (IN_LOOPBACK(ntohl(((struct sockaddr_in *)a)->sin_addr.s_addr)) ||
+	return (a->sa_family == AF_INET && (IN_LOOPBACK(ntohl(((struct sockaddr_in *)a)->sin_addr.s_addr)) ||
 		INADDR_ANY == ntohl((((struct sockaddr_in *)a)->sin_addr.s_addr)))) ||
-		(a->sa_family==AF_INET6 && (IN6_IS_ADDR_LOOPBACK(&((struct sockaddr_in6 *)a)->sin6_addr) ||
+		(a->sa_family == AF_INET6 && (IN6_IS_ADDR_LOOPBACK(&((struct sockaddr_in6 *)a)->sin6_addr) ||
 			IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)a)->sin6_addr) ||
 			(IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)a)->sin6_addr) && (IN_LOOPBACK(ntohl(IN6_EXTRACT_MAP4(((struct sockaddr_in6*)a)->sin6_addr.s6_addr))) ||
 				INADDR_ANY == ntohl(IN6_EXTRACT_MAP4(((struct sockaddr_in6*)a)->sin6_addr.s6_addr))))));
@ -253,7 +257,7 @@ bool is_localnet(const struct sockaddr *a)
 bool is_linklocal(const struct sockaddr_in6 *a)
 {
 	// fe80::/10
-	return a->sin6_addr.s6_addr[0]==0xFE && (a->sin6_addr.s6_addr[1] & 0xC0)==0x80;
+	return a->sin6_addr.s6_addr[0] == 0xFE && (a->sin6_addr.s6_addr[1] & 0xC0) == 0x80;
 }
 bool is_private6(const struct sockaddr_in6* a)
 {
@ -265,23 +269,23 @@ bool is_private6(const struct sockaddr_in6* a)

 bool set_keepalive(int fd)
 {
-	int yes=1;
-	return setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &yes, sizeof(int))!=-1;
+	int yes = 1;
+	return setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &yes, sizeof(int)) != -1;
 }
 bool set_ttl(int fd, int ttl)
 {
-	return setsockopt(fd, IPPROTO_IP, IP_TTL, &ttl, sizeof(ttl))!=-1;
+	return setsockopt(fd, IPPROTO_IP, IP_TTL, &ttl, sizeof(ttl)) != -1;
 }
 bool set_hl(int fd, int hl)
 {
-	return setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &hl, sizeof(hl))!=-1;
+	return setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &hl, sizeof(hl)) != -1;
 }
 bool set_ttl_hl(int fd, int ttl)
 {
-	bool b1,b2;
+	bool b1, b2;
 	// try to set both but one may fail if family is wrong
-	b1=set_ttl(fd, ttl);
-	b2=set_hl(fd, ttl);
+	b1 = set_ttl(fd, ttl);
+	b2 = set_hl(fd, ttl);
 	return b1 || b2;
 }
 int get_so_error(int fd)
@ -289,8 +293,8 @@ int get_so_error(int fd)
 	// getsockopt(SO_ERROR) clears error
 	int errn;
 	socklen_t optlen = sizeof(errn);
-	if(getsockopt(fd, SOL_SOCKET, SO_ERROR, &errn, &optlen) == -1)
-		errn=errno;
+	if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &errn, &optlen) == -1)
+		errn = errno;
 	return errn;
 }

@ -300,53 +304,53 @@ int fprint_localtime(FILE *F)
 	time_t now;

 	time(&now);
-	localtime_r(&now,&t);
+	localtime_r(&now, &t);
 	return fprintf(F, "%02d.%02d.%04d %02d:%02d:%02d", t.tm_mday, t.tm_mon + 1, t.tm_year + 1900, t.tm_hour, t.tm_min, t.tm_sec);
 }

 time_t file_mod_time(const char *filename)
 {
 	struct stat st;
-	return stat(filename,&st)==-1 ? 0 : st.st_mtime;
+	return stat(filename, &st) == -1 ? 0 : st.st_mtime;
 }

 bool pf_in_range(uint16_t port, const port_filter *pf)
 {
-	return port && (((!pf->from && !pf->to) || (port>=pf->from && port<=pf->to)) ^ pf->neg);
+	return port && (((!pf->from && !pf->to) || (port >= pf->from && port <= pf->to)) ^ pf->neg);
 }
 bool pf_parse(const char *s, port_filter *pf)
 {
-	unsigned int v1,v2;
+	unsigned int v1, v2;
 	char c;

 	if (!s) return false;
-	if (*s=='*' && s[1]==0)
+	if (*s == '*' && s[1] == 0)
 	{
-		pf->from=1; pf->to=0xFFFF;
+		pf->from = 1; pf->to = 0xFFFF;
 		return true;
 	}
-	if (*s=='~')
+	if (*s == '~')
 	{
-		pf->neg=true;
+		pf->neg = true;
 		s++;
 	}
 	else
-		pf->neg=false;
-	if (sscanf(s,"%u-%u%c",&v1,&v2,&c)==2)
+		pf->neg = false;
+	if (sscanf(s, "%u-%u%c", &v1, &v2, &c) == 2)
 	{
-		if (v1>65535 || v2>65535 || v1>v2) return false;
-		pf->from=(uint16_t)v1;
-		pf->to=(uint16_t)v2;
+		if (v1 > 65535 || v2 > 65535 || v1 > v2) return false;
+		pf->from = (uint16_t)v1;
+		pf->to = (uint16_t)v2;
 	}
-	else if (sscanf(s,"%u%c",&v1,&c)==1)
+	else if (sscanf(s, "%u%c", &v1, &c) == 1)
 	{
-		if (v1>65535) return false;
-		pf->to=pf->from=(uint16_t)v1;
+		if (v1 > 65535) return false;
+		pf->to = pf->from = (uint16_t)v1;
 	}
 	else
 		return false;
 	// deny all case
-	if (!pf->from && !pf->to) pf->neg=true;
+	if (!pf->from && !pf->to) pf->neg = true;
 	return true;
 }
 bool pf_is_empty(const port_filter *pf)
@ -357,12 +361,12 @@ bool pf_is_empty(const port_filter *pf)

 bool set_env_exedir(const char *argv0)
 {
-	char *s,*d;
-	bool bOK=false;
+	char *s, *d;
+	bool bOK = false;
 	if ((s = strdup(argv0)))
 	{
 		if ((d = dirname(s)))
-			setenv("EXEDIR",s,1);
+			setenv("EXEDIR", s, 1);
 		free(s);
 	}
 	return bOK;
@ -372,23 +376,23 @@ bool set_env_exedir(const char *argv0)
 static void mask_from_preflen6_make(uint8_t plen, struct in6_addr *a)
 {
 	if (plen >= 128)
-		memset(a->s6_addr,0xFF,16);
+		memset(a->s6_addr, 0xFF, 16);
 	else
 	{
 		uint8_t n = plen >> 3;
-		memset(a->s6_addr,0xFF,n);
-		memset(a->s6_addr+n,0x00,16-n);
+		memset(a->s6_addr, 0xFF, n);
+		memset(a->s6_addr + n, 0x00, 16 - n);
 		a->s6_addr[n] = (uint8_t)(0xFF00 >> (plen & 7));
 	}
 }
 struct in6_addr ip6_mask[129];
 void mask_from_preflen6_prepare(void)
 {
-	for (int plen=0;plen<=128;plen++) mask_from_preflen6_make(plen, ip6_mask+plen);
+	for (int plen = 0; plen <= 128; plen++) mask_from_preflen6_make(plen, ip6_mask + plen);
 }

 #if defined(__GNUC__) && !defined(__llvm__)
-__attribute__((optimize ("no-strict-aliasing")))
+__attribute__((optimize("no-strict-aliasing")))
 #endif
 void ip6_and(const struct in6_addr * restrict a, const struct in6_addr * restrict b, struct in6_addr * restrict result)
 {
@ -400,64 +404,116 @@ void ip6_and(const struct in6_addr * restrict a, const struct in6_addr * restric
 void str_cidr4(char *s, size_t s_len, const struct cidr4 *cidr)
 {
 	char s_ip[16];
-	*s_ip=0;
+	*s_ip = 0;
 	inet_ntop(AF_INET, &cidr->addr, s_ip, sizeof(s_ip));
-	snprintf(s,s_len,cidr->preflen<32 ? "%s/%u" : "%s", s_ip, cidr->preflen);
+	snprintf(s, s_len, cidr->preflen < 32 ? "%s/%u" : "%s", s_ip, cidr->preflen);
 }
 void print_cidr4(const struct cidr4 *cidr)
 {
 	char s[19];
-	str_cidr4(s,sizeof(s),cidr);
-	printf("%s",s);
+	str_cidr4(s, sizeof(s), cidr);
+	printf("%s", s);
 }
 void str_cidr6(char *s, size_t s_len, const struct cidr6 *cidr)
 {
 	char s_ip[40];
-	*s_ip=0;
+	*s_ip = 0;
 	inet_ntop(AF_INET6, &cidr->addr, s_ip, sizeof(s_ip));
-	snprintf(s,s_len,cidr->preflen<128 ? "%s/%u" : "%s", s_ip, cidr->preflen);
+	snprintf(s, s_len, cidr->preflen < 128 ? "%s/%u" : "%s", s_ip, cidr->preflen);
 }
 void print_cidr6(const struct cidr6 *cidr)
 {
 	char s[44];
-	str_cidr6(s,sizeof(s),cidr);
-	printf("%s",s);
+	str_cidr6(s, sizeof(s), cidr);
+	printf("%s", s);
 }
 bool parse_cidr4(char *s, struct cidr4 *cidr)
 {
-	char *p,d;
+	char *p, d;
 	bool b;
 	unsigned int plen;

 	if ((p = strchr(s, '/')))
 	{
-		if (sscanf(p + 1, "%u", &plen)!=1 || plen>32)
+		if (sscanf(p + 1, "%u", &plen) != 1 || plen > 32)
 			return false;
 		cidr->preflen = (uint8_t)plen;
-		d=*p; *p=0; // backup char
+		d = *p; *p = 0; // backup char
 	}
 	else
 		cidr->preflen = 32;
-	b = (inet_pton(AF_INET, s, &cidr->addr)==1);
-	if (p) *p=d; // restore char
+	b = (inet_pton(AF_INET, s, &cidr->addr) == 1);
+	if (p) *p = d; // restore char
 	return b;
 }
 bool parse_cidr6(char *s, struct cidr6 *cidr)
 {
-	char *p,d;
+	char *p, d;
 	bool b;
 	unsigned int plen;

 	if ((p = strchr(s, '/')))
 	{
-		if (sscanf(p + 1, "%u", &plen)!=1 || plen>128)
+		if (sscanf(p + 1, "%u", &plen) != 1 || plen > 128)
 			return false;
 		cidr->preflen = (uint8_t)plen;
-		d=*p; *p=0; // backup char
+		d = *p; *p = 0; // backup char
 	}
 	else
 		cidr->preflen = 128;
-	b = (inet_pton(AF_INET6, s, &cidr->addr)==1);
-	if (p) *p=d; // restore char
+	b = (inet_pton(AF_INET6, s, &cidr->addr) == 1);
+	if (p) *p = d; // restore char
 	return b;
 }
+
+
+void msleep(unsigned int ms)
+{
+	struct timespec time = {
+		 .tv_nsec = (ms % 1000) * 1000000,
+		 .tv_sec = ms / 1000
+	};
+	nanosleep(&time, 0);
+}
+
+#ifdef __linux__
+bool socket_has_notsent(int sfd)
+{
+	struct tcp_info tcpi;
+	socklen_t ts = sizeof(tcpi);
+
+	if (getsockopt(sfd, IPPROTO_TCP, TCP_INFO, (char *)&tcpi, &ts) < 0)
+		return false;
+	if (tcpi.tcpi_state != 1)
+		return false;
+	size_t s = (char *)&tcpi.tcpi_notsent_bytes - (char *)&tcpi.tcpi_state;
+	if (ts < s)
+		return false;
+	return !!tcpi.tcpi_notsent_bytes;
+}
+bool socket_wait_notsent(int sfd, unsigned int delay_ms, unsigned int *wasted_ms)
+{
+	struct timespec tres;
+	unsigned int mtick;
+
+	if (wasted_ms) *wasted_ms=0;
+	if (!socket_has_notsent(sfd)) return true;
+
+	if (clock_getres(CLOCK_MONOTONIC,&tres))
+	{
+		tres.tv_nsec = 10000000;
+		tres.tv_sec = 0;
+	}
+	mtick = (unsigned int)(tres.tv_sec*1000) + (unsigned int)(tres.tv_nsec/1000000);
+	if (mtick<1) mtick=1;
+	for(;;)
+	{
+		msleep(mtick);
+		if (wasted_ms) *wasted_ms+=mtick;
+		if (!socket_has_notsent(sfd)) return true;
+		if (delay_ms<=mtick) break;
+		delay_ms-=mtick;
+	}
+	return false;
+}
+#endif
--- a/tpws/helpers.h
+++ b/tpws/helpers.h
@ -117,3 +117,9 @@ static inline const struct in6_addr *mask_from_preflen6(uint8_t preflen)
 {
 	return ip6_mask+preflen;
 }
+
+void msleep(unsigned int ms);
+#ifdef __linux__
+bool socket_has_notsent(int sfd);
+bool socket_wait_notsent(int sfd, unsigned int delay_ms, unsigned int *wasted_ms);
+#endif
--- a/tpws/params.h
+++ b/tpws/params.h
@ -104,6 +104,7 @@ struct params_s
 	uint8_t proxy_type;
 	bool no_resolve;
 	bool skip_nodelay;
+	bool fix_seg;
 	bool droproot;
 	uid_t uid;
 	gid_t gid;
--- a/tpws/tpws.c
+++ b/tpws/tpws.c
@ -169,6 +169,9 @@ static void exithelp(void)
 		" --uid=uid[:gid]\t\t\t; drop root privs\n"
 #if defined(__FreeBSD__)
 		" --enable-pf\t\t\t\t; enable PF redirector support. required in FreeBSD when used with PF firewall.\n"
+#endif
+#if defined(__linux__)
+		" --fix-seg\t\t\t\t; fix segmentation failures at the cost of possible slowdown\n"
 #endif
 		" --debug=0|1|2|syslog|@<filename>\t; 1 and 2 means log to console and set debug level. for other targets use --debug-level.\n"
 		" --debug-level=0|1|2\t\t\t; specify debug level\n"
@ -635,8 +638,9 @@ void parse_params(int argc, char *argv[])
 		{ "local-tcp-user-timeout",required_argument,0,0 },	// optidx=62
 		{ "remote-tcp-user-timeout",required_argument,0,0 },	// optidx=63
 		{ "mss",required_argument,0,0 },			// optidx=64
+		{ "fix-seg",no_argument,0,0 },				// optidx=65
 #ifdef SPLICE_PRESENT
-		{ "nosplice",no_argument,0,0 },				// optidx=65
+		{ "nosplice",no_argument,0,0 },				// optidx=66
 #endif
 #endif
 		{ "hostlist-auto-retrans-threshold",optional_argument,0,0}, // ignored. for nfqws command line compatibility
@ -1228,8 +1232,11 @@ void parse_params(int argc, char *argv[])
 				exit_clean(1);
 			}
 			break;
+		case 65: /* fix-seg */
+			params.fix_seg = true;
+			break;
 #ifdef SPLICE_PRESENT
-		case 65: /* nosplice */
+		case 66: /* nosplice */
 			params.nosplice = true;
 			break;
 #endif
--- a/tpws/tpws_conn.c
+++ b/tpws/tpws_conn.c
@ -1244,7 +1244,21 @@ static bool handle_epoll(tproxy_conn_t *conn, struct tailhead *conn_list, uint32
 							if (wr>0) conn->partner->twr += wr;
 							break;
 						}
-
+#ifdef __linux__
+						if (params.fix_seg)
+						{
+							unsigned int wasted;
+							if (!socket_wait_notsent(conn->partner->fd, 20, &wasted))
+								DLOG_ERR("WARNING ! segmentation failed\n");
+							if (wasted)
+								VPRINT("WARNING ! wasted %u ms to fix segmenation\n", wasted);
+						}
+						else
+						{
+							if (socket_has_notsent(conn->partner->fd))
+								DLOG_ERR("WARNING ! segmentation failed\n");
+						}
+#endif
 						from = to;
 					}
 				}