Date: Tue, 16 Mar 2004 23:14:23 +0100 From: des@des.no (Dag-Erling =?iso-8859-1?q?Sm=F8rgrav?=) To: current@freebsd.org Cc: net@freebsd.org Subject: Re: libalias patch for review / testing Message-ID: <xzp3c88jv7k.fsf@dwp.des.no> In-Reply-To: <xzp7jxkjv98.fsf@dwp.des.no> (Dag-Erling =?iso-8859-1?q?Sm=F8rgrav's?= message of "Tue, 16 Mar 2004 23:13:23 %2B0100") References: <xzp7jxkjv98.fsf@dwp.des.no>
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des@des.no (Dag-Erling Sm=C3=B8rgrav) writes:
> Anybody running natd on -CURRENT, please test the attached patch
Umm, here's a patch that actually compiles.
DES
--=20
Dag-Erling Sm=C3=B8rgrav - des@des.no
--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment; filename=libalias.diff
Index: Makefile
===================================================================
RCS file: /home/ncvs/src/lib/libalias/Makefile,v
retrieving revision 1.24
diff -u -r1.24 Makefile
--- Makefile 17 Jan 2004 10:52:20 -0000 1.24
+++ Makefile 16 Mar 2004 22:14:03 -0000
@@ -8,5 +8,6 @@
alias_nbt.c alias_pptp.c alias_proxy.c alias_skinny.c alias_smedia.c \
alias_util.c alias_old.c
INCS= alias.h
+WARNS?= 2
.include <bsd.lib.mk>
Index: alias.c
===================================================================
RCS file: /home/ncvs/src/lib/libalias/alias.c,v
retrieving revision 1.40
diff -u -r1.40 alias.c
--- alias.c 16 Mar 2004 21:30:41 -0000 1.40
+++ alias.c 16 Mar 2004 22:14:03 -0000
@@ -136,8 +136,13 @@
#define TFTP_PORT_NUMBER 69
#define PPTP_CONTROL_PORT_NUMBER 1723
+static __inline int
+twowords(void *p)
+{
+ u_short *s = p;
-
+ return (s[0] + s[1]);
+}
/* TCP Handling Routines
@@ -295,9 +300,7 @@
original_address = GetOriginalAddress(link);
DifferentialChecksum(&pip->ip_sum,
- (u_short *) & original_address,
- (u_short *) & pip->ip_dst,
- 2);
+ &original_address, &pip->ip_dst, 2);
pip->ip_dst = original_address;
}
@@ -344,7 +347,6 @@
if (link != NULL) {
if (ip->ip_p == IPPROTO_UDP || ip->ip_p == IPPROTO_TCP) {
- u_short *sptr;
int accumulate, accumulate2;
struct in_addr original_address;
u_short original_port;
@@ -353,12 +355,8 @@
original_port = GetOriginalPort(link);
/* Adjust ICMP checksum */
- sptr = (u_short *) & (ip->ip_src);
- accumulate = *sptr++;
- accumulate += *sptr;
- sptr = (u_short *) & original_address;
- accumulate -= *sptr++;
- accumulate -= *sptr;
+ accumulate = twowords(&ip->ip_src);
+ accumulate -= twowords(&original_address);
accumulate += ud->uh_sport;
accumulate -= original_port;
accumulate2 = accumulate;
@@ -369,9 +367,7 @@
/* Un-alias address in IP header */
DifferentialChecksum(&pip->ip_sum,
- (u_short *) & original_address,
- (u_short *) & pip->ip_dst,
- 2);
+ &original_address, &pip->ip_dst, 2);
pip->ip_dst = original_address;
/* Un-alias address and port number of original IP packet
@@ -379,7 +375,6 @@
ip->ip_src = original_address;
ud->uh_sport = original_port;
} else if (ip->ip_p == IPPROTO_ICMP) {
- u_short *sptr;
int accumulate, accumulate2;
struct in_addr original_address;
u_short original_id;
@@ -388,12 +383,8 @@
original_id = GetOriginalPort(link);
/* Adjust ICMP checksum */
- sptr = (u_short *) & (ip->ip_src);
- accumulate = *sptr++;
- accumulate += *sptr;
- sptr = (u_short *) & original_address;
- accumulate -= *sptr++;
- accumulate -= *sptr;
+ accumulate = twowords(&ip->ip_src);
+ accumulate -= twowords(&original_address);
accumulate += ic2->icmp_id;
accumulate -= original_id;
accumulate2 = accumulate;
@@ -404,9 +395,7 @@
/* Un-alias address in IP header */
DifferentialChecksum(&pip->ip_sum,
- (u_short *) & original_address,
- (u_short *) & pip->ip_dst,
- 2);
+ &original_address, &pip->ip_dst, 2);
pip->ip_dst = original_address;
/* Un-alias address of original IP packet and sequence number of
@@ -489,9 +478,7 @@
alias_address = GetAliasAddress(link);
DifferentialChecksum(&pip->ip_sum,
- (u_short *) & alias_address,
- (u_short *) & pip->ip_src,
- 2);
+ &alias_address, &pip->ip_src, 2);
pip->ip_src = alias_address;
}
@@ -539,7 +526,6 @@
if (link != NULL) {
if (ip->ip_p == IPPROTO_UDP || ip->ip_p == IPPROTO_TCP) {
- u_short *sptr;
int accumulate;
struct in_addr alias_address;
u_short alias_port;
@@ -548,12 +534,8 @@
alias_port = GetAliasPort(link);
/* Adjust ICMP checksum */
- sptr = (u_short *) & (ip->ip_dst);
- accumulate = *sptr++;
- accumulate += *sptr;
- sptr = (u_short *) & alias_address;
- accumulate -= *sptr++;
- accumulate -= *sptr;
+ accumulate = twowords(&ip->ip_dst);
+ accumulate -= twowords(&alias_address);
accumulate += ud->uh_dport;
accumulate -= alias_port;
ADJUST_CHECKSUM(accumulate, ic->icmp_cksum);
@@ -564,9 +546,7 @@
*/
if (pip->ip_src.s_addr == ip->ip_dst.s_addr) {
DifferentialChecksum(&pip->ip_sum,
- (u_short *) & alias_address,
- (u_short *) & pip->ip_src,
- 2);
+ &alias_address, &pip->ip_src, 2);
pip->ip_src = alias_address;
}
/* Alias address and port number of original IP packet
@@ -574,7 +554,6 @@
ip->ip_dst = alias_address;
ud->uh_dport = alias_port;
} else if (ip->ip_p == IPPROTO_ICMP) {
- u_short *sptr;
int accumulate;
struct in_addr alias_address;
u_short alias_id;
@@ -583,12 +562,8 @@
alias_id = GetAliasPort(link);
/* Adjust ICMP checksum */
- sptr = (u_short *) & (ip->ip_dst);
- accumulate = *sptr++;
- accumulate += *sptr;
- sptr = (u_short *) & alias_address;
- accumulate -= *sptr++;
- accumulate -= *sptr;
+ accumulate = twowords(&ip->ip_dst);
+ accumulate -= twowords(&alias_address);
accumulate += ic2->icmp_id;
accumulate -= alias_id;
ADJUST_CHECKSUM(accumulate, ic->icmp_cksum);
@@ -599,9 +574,7 @@
*/
if (pip->ip_src.s_addr == ip->ip_dst.s_addr) {
DifferentialChecksum(&pip->ip_sum,
- (u_short *) & alias_address,
- (u_short *) & pip->ip_src,
- 2);
+ &alias_address, &pip->ip_src, 2);
pip->ip_src = alias_address;
}
/* Alias address of original IP packet and sequence number of
@@ -673,9 +646,7 @@
/* Restore original IP address */
DifferentialChecksum(&pip->ip_sum,
- (u_short *) & original_address,
- (u_short *) & pip->ip_dst,
- 2);
+ &original_address, &pip->ip_dst, 2);
pip->ip_dst = original_address;
return (PKT_ALIAS_OK);
@@ -706,9 +677,7 @@
/* Change source address */
DifferentialChecksum(&pip->ip_sum,
- (u_short *) & alias_address,
- (u_short *) & pip->ip_src,
- 2);
+ &alias_address, &pip->ip_src, 2);
pip->ip_src = alias_address;
return (PKT_ALIAS_OK);
@@ -737,7 +706,6 @@
struct in_addr original_address;
u_short alias_port;
int accumulate;
- u_short *sptr;
int r = 0;
alias_address = GetAliasAddress(link);
@@ -762,19 +730,13 @@
if (ud->uh_sum != 0) {
accumulate = alias_port;
accumulate -= ud->uh_dport;
- sptr = (u_short *) & alias_address;
- accumulate += *sptr++;
- accumulate += *sptr;
- sptr = (u_short *) & original_address;
- accumulate -= *sptr++;
- accumulate -= *sptr;
+ accumulate += twowords(&alias_address);
+ accumulate -= twowords(&original_address);
ADJUST_CHECKSUM(accumulate, ud->uh_sum);
}
/* Restore original IP address */
DifferentialChecksum(&pip->ip_sum,
- (u_short *) & original_address,
- (u_short *) & pip->ip_dst,
- 2);
+ &original_address, &pip->ip_dst, 2);
pip->ip_dst = original_address;
/*
@@ -834,16 +796,11 @@
/* being aliased and source address is being altered */
if (ud->uh_sum != 0) {
int accumulate;
- u_short *sptr;
accumulate = ud->uh_sport;
accumulate -= alias_port;
- sptr = (u_short *) & (pip->ip_src);
- accumulate += *sptr++;
- accumulate += *sptr;
- sptr = (u_short *) & alias_address;
- accumulate -= *sptr++;
- accumulate -= *sptr;
+ accumulate += twowords(&pip->ip_src);
+ accumulate -= twowords(&alias_address);
ADJUST_CHECKSUM(accumulate, ud->uh_sum);
}
/* Put alias port in UDP header */
@@ -851,9 +808,7 @@
/* Change source address */
DifferentialChecksum(&pip->ip_sum,
- (u_short *) & alias_address,
- (u_short *) & pip->ip_src,
- 2);
+ &alias_address, &pip->ip_src, 2);
pip->ip_src = alias_address;
return (PKT_ALIAS_OK);
@@ -882,7 +837,6 @@
u_short alias_port;
u_short proxy_port;
int accumulate;
- u_short *sptr;
/* Special processing for IP encoding protocols */
if (ntohs(tc->th_dport) == PPTP_CONTROL_PORT_NUMBER
@@ -903,12 +857,8 @@
/* and destination port is being altered. */
accumulate = alias_port;
accumulate -= tc->th_dport;
- sptr = (u_short *) & alias_address;
- accumulate += *sptr++;
- accumulate += *sptr;
- sptr = (u_short *) & original_address;
- accumulate -= *sptr++;
- accumulate -= *sptr;
+ accumulate += twowords(&alias_address);
+ accumulate -= twowords(&original_address);
/* If this is a proxy, then modify the TCP source port and
checksum accumulation */
@@ -916,13 +866,8 @@
accumulate += tc->th_sport;
tc->th_sport = proxy_port;
accumulate -= tc->th_sport;
-
- sptr = (u_short *) & pip->ip_src;
- accumulate += *sptr++;
- accumulate += *sptr;
- sptr = (u_short *) & proxy_address;
- accumulate -= *sptr++;
- accumulate -= *sptr;
+ accumulate += twowords(&pip->ip_src);
+ accumulate -= twowords(&proxy_address);
}
/* See if ACK number needs to be modified */
if (GetAckModified(link) == 1) {
@@ -930,36 +875,23 @@
delta = GetDeltaAckIn(pip, link);
if (delta != 0) {
- sptr = (u_short *) & tc->th_ack;
- accumulate += *sptr++;
- accumulate += *sptr;
+ accumulate += twowords(&tc->th_ack);
tc->th_ack = htonl(ntohl(tc->th_ack) - delta);
- sptr = (u_short *) & tc->th_ack;
- accumulate -= *sptr++;
- accumulate -= *sptr;
+ accumulate -= twowords(&tc->th_ack);
}
}
ADJUST_CHECKSUM(accumulate, tc->th_sum);
/* Restore original IP address */
- sptr = (u_short *) & pip->ip_dst;
- accumulate = *sptr++;
- accumulate += *sptr;
- pip->ip_dst = original_address;
- sptr = (u_short *) & pip->ip_dst;
- accumulate -= *sptr++;
- accumulate -= *sptr;
+ accumulate = twowords(&pip->ip_dst);
+ accumulate -= twowords(&pip->ip_dst);
/* If this is a transparent proxy packet, then modify the source
address */
if (proxy_address.s_addr != 0) {
- sptr = (u_short *) & pip->ip_src;
- accumulate += *sptr++;
- accumulate += *sptr;
+ accumulate += twowords(&pip->ip_src);
pip->ip_src = proxy_address;
- sptr = (u_short *) & pip->ip_src;
- accumulate -= *sptr++;
- accumulate -= *sptr;
+ accumulate -= twowords(&pip->ip_src);
}
ADJUST_CHECKSUM(accumulate, pip->ip_sum);
@@ -995,29 +927,17 @@
dest_address = pip->ip_dst;
if (proxy_type != 0) {
int accumulate;
- u_short *sptr;
accumulate = tc->th_dport;
tc->th_dport = proxy_server_port;
accumulate -= tc->th_dport;
-
- sptr = (u_short *) & (pip->ip_dst);
- accumulate += *sptr++;
- accumulate += *sptr;
- sptr = (u_short *) & proxy_server_address;
- accumulate -= *sptr++;
- accumulate -= *sptr;
-
+ accumulate += twowords(&pip->ip_dst);
+ accumulate -= twowords(&proxy_server_address);
ADJUST_CHECKSUM(accumulate, tc->th_sum);
- sptr = (u_short *) & (pip->ip_dst);
- accumulate = *sptr++;
- accumulate += *sptr;
+ accumulate = twowords(&pip->ip_dst);
pip->ip_dst = proxy_server_address;
- sptr = (u_short *) & (pip->ip_dst);
- accumulate -= *sptr++;
- accumulate -= *sptr;
-
+ accumulate -= twowords(&pip->ip_dst);
ADJUST_CHECKSUM(accumulate, pip->ip_sum);
}
link = FindUdpTcpOut(la, pip->ip_src, pip->ip_dst,
@@ -1027,7 +947,6 @@
u_short alias_port;
struct in_addr alias_address;
int accumulate;
- u_short *sptr;
/* Save original destination address, if this is a proxy packet.
Also modify packet to include destination encoding. This may
@@ -1069,13 +988,8 @@
accumulate = tc->th_sport;
tc->th_sport = alias_port;
accumulate -= tc->th_sport;
-
- sptr = (u_short *) & (pip->ip_src);
- accumulate += *sptr++;
- accumulate += *sptr;
- sptr = (u_short *) & alias_address;
- accumulate -= *sptr++;
- accumulate -= *sptr;
+ accumulate += twowords(&pip->ip_src);
+ accumulate -= twowords(&alias_address);
/* Modify sequence number if necessary */
if (GetAckModified(link) == 1) {
@@ -1083,26 +997,17 @@
delta = GetDeltaSeqOut(pip, link);
if (delta != 0) {
- sptr = (u_short *) & tc->th_seq;
- accumulate += *sptr++;
- accumulate += *sptr;
+ accumulate += twowords(&tc->th_seq);
tc->th_seq = htonl(ntohl(tc->th_seq) + delta);
- sptr = (u_short *) & tc->th_seq;
- accumulate -= *sptr++;
- accumulate -= *sptr;
+ accumulate -= twowords(&tc->th_seq);
}
}
ADJUST_CHECKSUM(accumulate, tc->th_sum);
/* Change source address */
- sptr = (u_short *) & (pip->ip_src);
- accumulate = *sptr++;
- accumulate += *sptr;
+ accumulate = twowords(&pip->ip_src);
pip->ip_src = alias_address;
- sptr = (u_short *) & (pip->ip_src);
- accumulate -= *sptr++;
- accumulate -= *sptr;
-
+ accumulate -= twowords(&pip->ip_src);
ADJUST_CHECKSUM(accumulate, pip->ip_sum);
return (PKT_ALIAS_OK);
@@ -1142,9 +1047,7 @@
GetFragmentAddr(link, &original_address);
DifferentialChecksum(&pip->ip_sum,
- (u_short *) & original_address,
- (u_short *) & pip->ip_dst,
- 2);
+ &original_address, &pip->ip_dst, 2);
pip->ip_dst = original_address;
return (PKT_ALIAS_OK);
@@ -1160,9 +1063,7 @@
alias_address = FindAliasAddress(la, pip->ip_src);
DifferentialChecksum(&pip->ip_sum,
- (u_short *) & alias_address,
- (u_short *) & pip->ip_src,
- 2);
+ &alias_address, &pip->ip_src, 2);
pip->ip_src = alias_address;
return (PKT_ALIAS_OK);
@@ -1240,9 +1141,7 @@
fpip = (struct ip *)ptr_fragment;
DifferentialChecksum(&fpip->ip_sum,
- (u_short *) & pip->ip_dst,
- (u_short *) & fpip->ip_dst,
- 2);
+ &pip->ip_dst, &fpip->ip_dst, 2);
fpip->ip_dst = pip->ip_dst;
}
@@ -1443,7 +1342,6 @@
/* Change it from an aliased packet to an unaliased packet */
if (link != NULL) {
if (pip->ip_p == IPPROTO_UDP || pip->ip_p == IPPROTO_TCP) {
- u_short *sptr;
int accumulate;
struct in_addr original_address;
u_short original_port;
@@ -1452,12 +1350,8 @@
original_port = GetOriginalPort(link);
/* Adjust TCP/UDP checksum */
- sptr = (u_short *) & (pip->ip_src);
- accumulate = *sptr++;
- accumulate += *sptr;
- sptr = (u_short *) & original_address;
- accumulate -= *sptr++;
- accumulate -= *sptr;
+ accumulate = twowords(&pip->ip_src);
+ accumulate -= twowords(&original_address);
if (pip->ip_p == IPPROTO_UDP) {
accumulate += ud->uh_sport;
@@ -1471,9 +1365,7 @@
/* Adjust IP checksum */
DifferentialChecksum(&pip->ip_sum,
- (u_short *) & original_address,
- (u_short *) & pip->ip_src,
- 2);
+ &original_address, &pip->ip_src, 2);
/* Un-alias source address and port number */
pip->ip_src = original_address;
@@ -1486,7 +1378,6 @@
} else if (pip->ip_p == IPPROTO_ICMP) {
- u_short *sptr;
int accumulate;
struct in_addr original_address;
u_short original_id;
@@ -1495,21 +1386,15 @@
original_id = GetOriginalPort(link);
/* Adjust ICMP checksum */
- sptr = (u_short *) & (pip->ip_src);
- accumulate = *sptr++;
- accumulate += *sptr;
- sptr = (u_short *) & original_address;
- accumulate -= *sptr++;
- accumulate -= *sptr;
+ accumulate = twowords(&pip->ip_src);
+ accumulate -= twowords(&original_address);
accumulate += ic->icmp_id;
accumulate -= original_id;
ADJUST_CHECKSUM(accumulate, ic->icmp_cksum);
/* Adjust IP checksum */
DifferentialChecksum(&pip->ip_sum,
- (u_short *) & original_address,
- (u_short *) & pip->ip_src,
- 2);
+ &original_address, &pip->ip_src, 2);
/* Un-alias source address and port number */
pip->ip_src = original_address;
Index: alias_local.h
===================================================================
RCS file: /home/ncvs/src/lib/libalias/alias_local.h,v
retrieving revision 1.26
diff -u -r1.26 alias_local.h
--- alias_local.h 16 Mar 2004 21:30:41 -0000 1.26
+++ alias_local.h 16 Mar 2004 22:14:03 -0000
@@ -168,8 +168,7 @@
u_short IpChecksum(struct ip *_pip);
u_short TcpChecksum(struct ip *_pip);
void
-DifferentialChecksum(u_short * _cksum, u_short * _new, u_short * _old,
- int _n);
+DifferentialChecksum(u_short * _cksum, void * _new, void * _old, int _n);
/* Internal data access */
struct alias_link *
Index: alias_pptp.c
===================================================================
RCS file: /home/ncvs/src/lib/libalias/alias_pptp.c,v
retrieving revision 1.8
diff -u -r1.8 alias_pptp.c
--- alias_pptp.c 16 Mar 2004 21:30:41 -0000 1.8
+++ alias_pptp.c 16 Mar 2004 22:14:03 -0000
@@ -338,9 +338,7 @@
/* Change source IP address. */
DifferentialChecksum(&pip->ip_sum,
- (u_short *) & alias_addr,
- (u_short *) & pip->ip_src,
- 2);
+ &alias_addr, &pip->ip_src, 2);
pip->ip_src = alias_addr;
}
return (0);
@@ -368,9 +366,7 @@
/* Restore original IP address. */
DifferentialChecksum(&pip->ip_sum,
- (u_short *) & src_addr,
- (u_short *) & pip->ip_dst,
- 2);
+ &src_addr, &pip->ip_dst, 2);
pip->ip_dst = src_addr;
}
return (0);
Index: alias_util.c
===================================================================
RCS file: /home/ncvs/src/lib/libalias/alias_util.c,v
retrieving revision 1.11
diff -u -r1.11 alias_util.c
--- alias_util.c 16 Mar 2004 21:30:41 -0000 1.11
+++ alias_util.c 16 Mar 2004 22:14:03 -0000
@@ -136,10 +136,12 @@
void
-DifferentialChecksum(u_short * cksum, u_short * new, u_short * old, int n)
+DifferentialChecksum(u_short * cksum, void *newp, void *oldp, int n)
{
int i;
int accumulate;
+ u_short *new = newp;
+ u_short *old = oldp;
accumulate = *cksum;
for (i = 0; i < n; i++) {
--=-=-=--
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