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Subject* 4 converted to << 2 for networking code
Hi all,

The attached patch converts many occurences of '* 4' in the networking code
(often used to convert in bytes the TCP data offset and the IP header len)
to the faster '<< 2'. Since this was a quite repetitive work it's better
if someone double-check it before to apply the patch.
The patch is for linux-2.4.

Please, CC: me for replies since I'm not subscribed to the list.

regards,
antirez

--
Salvatore Sanfilippo | <antirez@invece.org>
http://www.kyuzz.org/antirez | PGP: finger antirez@tella.alicom.comdiff -ru linux-2.4-orig/net/ipv4/ip_fragment.c linux-2.4/net/ipv4/ip_fragment.c
--- linux-2.4-orig/net/ipv4/ip_fragment.c Fri Dec 29 23:07:24 2000
+++ linux-2.4/net/ipv4/ip_fragment.c Wed Jan 10 16:50:05 2001
@@ -383,7 +383,7 @@
flags = offset & ~IP_OFFSET;
offset &= IP_OFFSET;
offset <<= 3; /* offset is in 8-byte chunks */
- ihl = iph->ihl * 4;
+ ihl = iph->ihl << 2;

/* Determine the position of this fragment. */
end = offset + (ntohs(iph->tot_len) - ihl);
@@ -521,7 +521,7 @@
BUG_TRAP(FRAG_CB(head)->offset == 0);

/* Allocate a new buffer for the datagram. */
- ihlen = head->nh.iph->ihl*4;
+ ihlen = head->nh.iph->ihl << 2;
len = ihlen + qp->len;

if(len > 65535)
diff -ru linux-2.4-orig/net/ipv4/ip_input.c linux-2.4/net/ipv4/ip_input.c
--- linux-2.4-orig/net/ipv4/ip_input.c Mon Dec 11 21:37:04 2000
+++ linux-2.4/net/ipv4/ip_input.c Wed Jan 10 16:50:31 2001
@@ -208,7 +208,7 @@
if(skb2 != NULL) {
ret = 1;
ipprot->handler(skb2,
- ntohs(iph->tot_len) - (iph->ihl * 4));
+ ntohs(iph->tot_len) - (iph->ihl << 2));
}
}
ipprot = (struct inet_protocol *) ipprot->next;
@@ -226,7 +226,7 @@
#endif /*CONFIG_NETFILTER_DEBUG*/

/* Point into the IP datagram, just past the header. */
- skb->h.raw = skb->nh.raw + iph->ihl*4;
+ skb->h.raw = skb->nh.raw + (iph->ihl << 2);

{
/* Note: See raw.c and net/raw.h, RAWV4_HTABLE_SIZE==MAX_INET_PROTOS */
@@ -251,7 +251,7 @@

/* Fast path... */
ret = ipprot->handler(skb, (ntohs(iph->tot_len) -
- (iph->ihl * 4)));
+ (iph->ihl << 2)));

return ret;
} else {
diff -ru linux-2.4-orig/net/ipv4/ip_options.c linux-2.4/net/ipv4/ip_options.c
--- linux-2.4-orig/net/ipv4/ip_options.c Wed Aug 9 22:51:09 2000
+++ linux-2.4/net/ipv4/ip_options.c Wed Jan 10 16:41:12 2001
@@ -255,7 +255,7 @@
opt = &(IPCB(skb)->opt);
memset(opt, 0, sizeof(struct ip_options));
iph = skb->nh.raw;
- opt->optlen = ((struct iphdr *)iph)->ihl*4 - sizeof(struct iphdr);
+ opt->optlen = (((struct iphdr *)iph)->ihl << 2) - sizeof(struct iphdr);
optptr = iph + sizeof(struct iphdr);
opt->is_data = 0;
} else {
diff -ru linux-2.4-orig/net/ipv4/ip_output.c linux-2.4/net/ipv4/ip_output.c
--- linux-2.4-orig/net/ipv4/ip_output.c Fri Oct 27 20:03:14 2000
+++ linux-2.4/net/ipv4/ip_output.c Wed Jan 10 16:51:18 2001
@@ -537,7 +537,7 @@
ipc->addr, rt, offset);
}
iph->tos = sk->protinfo.af_inet.tos;
- iph->tot_len = htons(fraglen - fragheaderlen + iph->ihl*4);
+ iph->tot_len = htons(fraglen - fragheaderlen + (iph->ihl << 2));
iph->frag_off = htons(offset>>3)|mf|df;
iph->id = id;
if (!mf) {
@@ -564,7 +564,7 @@
iph->saddr = rt->rt_src;
iph->daddr = rt->rt_dst;
iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
- data += iph->ihl*4;
+ data += iph->ihl << 2;
}

/*
@@ -685,7 +685,7 @@
iph->daddr=rt->rt_dst;
iph->check=0;
iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
- err = getfrag(frag, ((char *)iph)+iph->ihl*4,0, length-iph->ihl*4);
+ err = getfrag(frag, ((char *)iph)+(iph->ihl << 2),0, length-(iph->ihl << 2));
}
else
err = getfrag(frag, (void *)iph, 0, length);
@@ -745,7 +745,7 @@
* Setup starting values.
*/

- hlen = iph->ihl * 4;
+ hlen = iph->ihl << 2;
left = ntohs(iph->tot_len) - hlen; /* Space per frame */
mtu = rt->u.dst.pmtu - hlen; /* Size of data space */
ptr = raw + hlen; /* Where to start from */
diff -ru linux-2.4-orig/net/ipv4/netfilter/ip_conntrack_core.c linux-2.4/net/ipv4/netfilter/ip_conntrack_core.c
--- linux-2.4-orig/net/ipv4/netfilter/ip_conntrack_core.c Thu Aug 10 21:35:15 2000
+++ linux-2.4/net/ipv4/netfilter/ip_conntrack_core.c Wed Jan 10 16:46:23 2001
@@ -123,7 +123,7 @@
return 0;
}
/* Guarantee 8 protocol bytes: if more wanted, use len param */
- else if (iph->ihl * 4 + 8 > len)
+ else if ((iph->ihl << 2) + 8 > len)
return 0;

tuple->src.ip = iph->saddr;
@@ -308,9 +308,9 @@
iph = skb->nh.iph;
hdr = (struct icmphdr *)((u_int32_t *)iph + iph->ihl);
inner = (struct iphdr *)(hdr + 1);
- datalen = skb->len - iph->ihl*4 - sizeof(*hdr);
+ datalen = skb->len - (iph->ihl << 2) - sizeof(*hdr);

- if (skb->len < iph->ihl * 4 + sizeof(struct icmphdr)) {
+ if (skb->len < (iph->ihl << 2) + sizeof(struct icmphdr)) {
DEBUGP("icmp_error_track: too short\n");
return NULL;
}
@@ -337,7 +337,7 @@

innerproto = find_proto(inner->protocol);
/* Are they talking about one of our connections? */
- if (inner->ihl * 4 + 8 > datalen
+ if ((inner->ihl << 2) + 8 > datalen
|| !get_tuple(inner, datalen, &origtuple, innerproto)) {
DEBUGP("icmp_error: ! get_tuple p=%u (%u*4+%u dlen=%u)\n",
inner->protocol, inner->ihl, 8,
diff -ru linux-2.4-orig/net/ipv4/netfilter/ip_conntrack_ftp.c linux-2.4/net/ipv4/netfilter/ip_conntrack_ftp.c
--- linux-2.4-orig/net/ipv4/netfilter/ip_conntrack_ftp.c Thu Aug 10 21:35:15 2000
+++ linux-2.4/net/ipv4/netfilter/ip_conntrack_ftp.c Wed Jan 10 16:47:37 2001
@@ -104,10 +104,10 @@
enum ip_conntrack_info ctinfo)
{
/* tcplen not negative guaranteed by ip_conntrack_tcp.c */
- struct tcphdr *tcph = (void *)iph + iph->ihl * 4;
- const char *data = (const char *)tcph + tcph->doff * 4;
- unsigned int tcplen = len - iph->ihl * 4;
- unsigned int datalen = tcplen - tcph->doff * 4;
+ struct tcphdr *tcph = (void *)iph + (iph->ihl << 2);
+ const char *data = (const char *)tcph + (tcph->doff << 2);
+ unsigned int tcplen = len - (iph->ihl << 2);
+ unsigned int datalen = tcplen - (tcph->doff << 2);
u_int32_t old_seq_aft_nl;
int old_seq_aft_nl_set;
u_int32_t array[6] = { 0 };
@@ -124,7 +124,7 @@
}

/* Not whole TCP header? */
- if (tcplen < sizeof(struct tcphdr) || tcplen < tcph->doff*4) {
+ if (tcplen < sizeof(struct tcphdr) || tcplen < (tcph->doff << 2)) {
DEBUGP("ftp: tcplen = %u\n", (unsigned)tcplen);
return NF_ACCEPT;
}
diff -ru linux-2.4-orig/net/ipv4/netfilter/ip_conntrack_proto_tcp.c linux-2.4/net/ipv4/netfilter/ip_conntrack_proto_tcp.c
--- linux-2.4-orig/net/ipv4/netfilter/ip_conntrack_proto_tcp.c Fri Aug 4 22:07:24 2000
+++ linux-2.4/net/ipv4/netfilter/ip_conntrack_proto_tcp.c Wed Jan 10 16:49:20 2001
@@ -153,7 +153,7 @@

/* We're guaranteed to have the base header, but maybe not the
options. */
- if (len < (iph->ihl + tcph->doff) * 4) {
+ if (len < ((iph->ihl + tcph->doff) << 2)) {
DEBUGP("ip_conntrack_tcp: Truncated packet.\n");
return -1;
}
diff -ru linux-2.4-orig/net/ipv4/netfilter/ip_conntrack_standalone.c linux-2.4/net/ipv4/netfilter/ip_conntrack_standalone.c
--- linux-2.4-orig/net/ipv4/netfilter/ip_conntrack_standalone.c Thu Aug 10 21:35:15 2000
+++ linux-2.4/net/ipv4/netfilter/ip_conntrack_standalone.c Wed Jan 10 16:51:59 2001
@@ -217,7 +217,7 @@
{
/* root is playing with raw sockets. */
if ((*pskb)->len < sizeof(struct iphdr)
- || (*pskb)->nh.iph->ihl * 4 < sizeof(struct iphdr)) {
+ || ((*pskb)->nh.iph->ihl << 2) < sizeof(struct iphdr)) {
if (net_ratelimit())
printk("ipt_hook: happy cracking.\n");
return NF_ACCEPT;
diff -ru linux-2.4-orig/net/ipv4/netfilter/ip_nat_core.c linux-2.4/net/ipv4/netfilter/ip_nat_core.c
--- linux-2.4-orig/net/ipv4/netfilter/ip_nat_core.c Thu Aug 10 21:35:15 2000
+++ linux-2.4/net/ipv4/netfilter/ip_nat_core.c Wed Jan 10 16:52:27 2001
@@ -749,7 +749,7 @@
unsigned int i;
struct ip_nat_info *info = &conntrack->nat.info;

- IP_NF_ASSERT(skb->len >= iph->ihl*4 + sizeof(struct icmphdr));
+ IP_NF_ASSERT(skb->len >= (iph->ihl << 2) + sizeof(struct icmphdr));
/* Must be RELATED */
IP_NF_ASSERT(skb->nfct - (struct ip_conntrack *)skb->nfct->master
== IP_CT_RELATED
diff -ru linux-2.4-orig/net/ipv4/netfilter/ip_nat_ftp.c linux-2.4/net/ipv4/netfilter/ip_nat_ftp.c
--- linux-2.4-orig/net/ipv4/netfilter/ip_nat_ftp.c Sun Sep 17 19:15:00 2000
+++ linux-2.4/net/ipv4/netfilter/ip_nat_ftp.c Wed Jan 10 16:55:21 2001
@@ -112,9 +112,9 @@
sprintf(buffer, "%u,%u,%u,%u,%u,%u",
NIPQUAD(newip), port>>8, port&0xFF);

- tcplen = (*pskb)->len - iph->ihl * 4;
+ tcplen = (*pskb)->len - (iph->ihl << 2);
newtcplen = tcplen - matchlen + strlen(buffer);
- newlen = iph->ihl*4 + newtcplen;
+ newlen = (iph->ihl << 2) + newtcplen;

/* So there I am, in the middle of my `netfilter-is-wonderful'
talk in Sydney, and someone asks `What happens if you try
@@ -144,8 +144,8 @@
}
}

- tcph = (void *)iph + iph->ihl*4;
- data = (void *)tcph + tcph->doff*4;
+ tcph = (void *)iph + (iph->ihl << 2);
+ data = (void *)tcph + (tcph->doff << 2);

DEBUGP("Mapping `%.*s' [%u %u %u] to new `%s' [%u]\n",
(int)matchlen, data+matchoff,
@@ -183,11 +183,11 @@

/* Fix checksums */
iph->tot_len = htons(newlen);
- (*pskb)->csum = csum_partial((char *)tcph + tcph->doff*4,
- newtcplen - tcph->doff*4, 0);
+ (*pskb)->csum = csum_partial((char *)tcph + (tcph->doff << 2),
+ newtcplen - (tcph->doff << 2), 0);
tcph->check = 0;
tcph->check = tcp_v4_check(tcph, newtcplen, iph->saddr, iph->daddr,
- csum_partial((char *)tcph, tcph->doff*4,
+ csum_partial((char *)tcph, tcph->doff << 2,
(*pskb)->csum));
ip_send_check(iph);
return 1;
@@ -202,8 +202,8 @@
u_int8_t *opt = (u_int8_t *)tcph;

DEBUGP("Seeking SACKPERM in SYN packet (doff = %u).\n",
- tcph->doff * 4);
- for (i = sizeof(struct tcphdr); i < tcph->doff * 4;) {
+ tcph->doff << 2);
+ for (i = sizeof(struct tcphdr); i < (tcph->doff << 2);) {
DEBUGP("%u ", opt[i]);
switch (opt[i]) {
case TCPOPT_NOP:
@@ -227,7 +227,7 @@
DEBUGP("Found SACKPERM at offset %u.\n", i);

/* Must be within TCP header, and valid SACK perm. */
- if (i + opt[i+1] <= tcph->doff*4 && opt[i+1] == 2) {
+ if (i + opt[i+1] <= (tcph->doff << 2) && opt[i+1] == 2) {
/* Replace with NOPs. */
tcph->check
= ip_nat_cheat_check(*((u_int16_t *)(opt + i))^0xFFFF,
@@ -245,7 +245,7 @@
{
u_int32_t newip;
struct iphdr *iph = (*pskb)->nh.iph;
- struct tcphdr *tcph = (void *)iph + iph->ihl*4;
+ struct tcphdr *tcph = (void *)iph + (iph->ihl << 2);
u_int16_t port;
struct ip_conntrack_tuple tuple;
/* Don't care about source port */
@@ -304,7 +304,7 @@
struct sk_buff **pskb)
{
struct iphdr *iph = (*pskb)->nh.iph;
- struct tcphdr *tcph = (void *)iph + iph->ihl*4;
+ struct tcphdr *tcph = (void *)iph + (iph->ihl << 2);
u_int32_t newseq, newack;
unsigned int datalen;
int dir;
@@ -331,7 +331,7 @@
return NF_ACCEPT;
}

- datalen = (*pskb)->len - iph->ihl * 4 - tcph->doff * 4;
+ datalen = (*pskb)->len - (iph->ihl << 2) - (tcph->doff << 2);
score = 0;
LOCK_BH(&ip_ftp_lock);
if (ct_ftp_info->len) {
@@ -361,7 +361,7 @@

/* skb may have been reallocated */
iph = (*pskb)->nh.iph;
- tcph = (void *)iph + iph->ihl*4;
+ tcph = (void *)iph + (iph->ihl << 2);
}
}

diff -ru linux-2.4-orig/net/ipv4/netfilter/ip_nat_standalone.c linux-2.4/net/ipv4/netfilter/ip_nat_standalone.c
--- linux-2.4-orig/net/ipv4/netfilter/ip_nat_standalone.c Mon Oct 30 23:27:49 2000
+++ linux-2.4/net/ipv4/netfilter/ip_nat_standalone.c Wed Jan 10 16:55:51 2001
@@ -139,7 +139,7 @@
{
/* root is playing with raw sockets. */
if ((*pskb)->len < sizeof(struct iphdr)
- || (*pskb)->nh.iph->ihl * 4 < sizeof(struct iphdr))
+ || ((*pskb)->nh.iph->ihl << 2) < sizeof(struct iphdr))
return NF_ACCEPT;

/* We can hit fragment here; forwarded packets get
@@ -202,7 +202,7 @@

/* root is playing with raw sockets. */
if ((*pskb)->len < sizeof(struct iphdr)
- || (*pskb)->nh.iph->ihl * 4 < sizeof(struct iphdr))
+ || ((*pskb)->nh.iph->ihl << 2) < sizeof(struct iphdr))
return NF_ACCEPT;

saddr = (*pskb)->nh.iph->saddr;
diff -ru linux-2.4-orig/net/ipv4/netfilter/ip_tables.c linux-2.4/net/ipv4/netfilter/ip_tables.c
--- linux-2.4-orig/net/ipv4/netfilter/ip_tables.c Tue Dec 5 03:43:02 2000
+++ linux-2.4/net/ipv4/netfilter/ip_tables.c Wed Jan 10 16:56:27 2001
@@ -267,7 +267,7 @@
/* Initialization */
ip = (*pskb)->nh.iph;
protohdr = (u_int32_t *)ip + ip->ihl;
- datalen = (*pskb)->len - ip->ihl * 4;
+ datalen = (*pskb)->len - (ip->ihl << 2);
indev = in ? in->name : nulldevname;
outdev = out ? out->name : nulldevname;
/* We handle fragments by dealing with the first fragment as
@@ -373,7 +373,7 @@
/* Target might have changed stuff. */
ip = (*pskb)->nh.iph;
protohdr = (u_int32_t *)ip + ip->ihl;
- datalen = (*pskb)->len - ip->ihl * 4;
+ datalen = (*pskb)->len - (ip->ihl << 2);

if (verdict == IPT_CONTINUE)
e = (void *)e + e->next_offset;
@@ -1450,12 +1450,12 @@

duprintf("tcp_match: finding option\n");
/* If we don't have the whole header, drop packet. */
- if (tcp->doff * 4 > datalen) {
+ if ((tcp->doff << 2) > datalen) {
*hotdrop = 1;
return 0;
}

- while (i < tcp->doff * 4) {
+ while (i < (tcp->doff << 2)) {
if (opt[i] == option) return !invert;
if (opt[i] < 2) i++;
else i += opt[i+1]?:1;
diff -ru linux-2.4-orig/net/ipv4/netfilter/ipchains_core.c linux-2.4/net/ipv4/netfilter/ipchains_core.c
--- linux-2.4-orig/net/ipv4/netfilter/ipchains_core.c Fri Apr 14 02:19:57 2000
+++ linux-2.4/net/ipv4/netfilter/ipchains_core.c Wed Jan 10 16:56:50 2001
@@ -1679,7 +1679,7 @@
struct sk_buff **pskb)
{
/* Locally generated bogus packets by root. <SIGH>. */
- if (((struct iphdr *)phdr)->ihl * 4 < sizeof(struct iphdr)
+ if ((((struct iphdr *)phdr)->ihl << 2) < sizeof(struct iphdr)
|| (*pskb)->len < sizeof(struct iphdr))
return FW_ACCEPT;
return ip_fw_check(phdr, dev->name,
diff -ru linux-2.4-orig/net/ipv4/netfilter/ipt_LOG.c linux-2.4/net/ipv4/netfilter/ipt_LOG.c
--- linux-2.4-orig/net/ipv4/netfilter/ipt_LOG.c Mon Jan 1 18:54:07 2001
+++ linux-2.4/net/ipv4/netfilter/ipt_LOG.c Wed Jan 10 16:57:48 2001
@@ -32,7 +32,7 @@
struct iphdr *iph, unsigned int len, int recurse)
{
void *protoh = (u_int32_t *)iph + iph->ihl;
- unsigned int datalen = len - iph->ihl * 4;
+ unsigned int datalen = len - (iph->ihl << 2);

/* Important fields:
* TOS, len, DF/MF, fragment offset, TTL, src, dst, options. */
@@ -58,12 +58,12 @@
printk("FRAG:%u ", ntohs(iph->frag_off) & IP_OFFSET);

if ((info->logflags & IPT_LOG_IPOPT)
- && iph->ihl * 4 != sizeof(struct iphdr)) {
+ && (iph->ihl << 2) != sizeof(struct iphdr)) {
unsigned int i;

/* Max length: 127 "OPT (" 15*4*2chars ") " */
printk("OPT (");
- for (i = sizeof(struct iphdr); i < iph->ihl * 4; i++)
+ for (i = sizeof(struct iphdr); i < (iph->ihl << 2); i++)
printk("%02X", ((u_int8_t *)iph)[i]);
printk(") ");
}
@@ -112,12 +112,12 @@
printk("URGP=%u ", ntohs(tcph->urg_ptr));

if ((info->logflags & IPT_LOG_TCPOPT)
- && tcph->doff * 4 != sizeof(struct tcphdr)) {
+ && (tcph->doff << 2) != sizeof(struct tcphdr)) {
unsigned int i;

/* Max length: 127 "OPT (" 15*4*2chars ") " */
printk("OPT (");
- for (i =sizeof(struct tcphdr); i < tcph->doff * 4; i++)
+ for (i =sizeof(struct tcphdr); i < (tcph->doff << 2); i++)
printk("%02X", ((u_int8_t *)tcph)[i]);
printk(") ");
}
diff -ru linux-2.4-orig/net/ipv4/netfilter/ipt_REJECT.c linux-2.4/net/ipv4/netfilter/ipt_REJECT.c
--- linux-2.4-orig/net/ipv4/netfilter/ipt_REJECT.c Tue Sep 19 17:31:53 2000
+++ linux-2.4/net/ipv4/netfilter/ipt_REJECT.c Wed Jan 10 16:58:37 2001
@@ -36,7 +36,7 @@
return;

otcph = (struct tcphdr *)((u_int32_t*)oldskb->nh.iph + oldskb->nh.iph->ihl);
- otcplen = oldskb->len - oldskb->nh.iph->ihl*4;
+ otcplen = oldskb->len - (oldskb->nh.iph->ihl << 2);

/* No RST for RST. */
if (otcph->rst)
@@ -73,7 +73,7 @@

/* Truncate to length (no data) */
tcph->doff = sizeof(struct tcphdr)/4;
- skb_trim(nskb, nskb->nh.iph->ihl*4 + sizeof(struct tcphdr));
+ skb_trim(nskb, (nskb->nh.iph->ihl << 2) + sizeof(struct tcphdr));
nskb->nh.iph->tot_len = htons(nskb->len);

if (tcph->ack) {
@@ -170,7 +170,7 @@
case IPT_ICMP_ECHOREPLY: {
struct icmphdr *icmph = (struct icmphdr *)
((u_int32_t *)(*pskb)->nh.iph + (*pskb)->nh.iph->ihl);
- unsigned int datalen = (*pskb)->len - (*pskb)->nh.iph->ihl * 4;
+ unsigned int datalen = (*pskb)->len - ((*pskb)->nh.iph->ihl << 2);

/* Not non-head frags, or truncated */
if (((ntohs((*pskb)->nh.iph->frag_off) & IP_OFFSET) == 0)
diff -ru linux-2.4-orig/net/ipv4/netfilter/ipt_unclean.c linux-2.4/net/ipv4/netfilter/ipt_unclean.c
--- linux-2.4-orig/net/ipv4/netfilter/ipt_unclean.c Fri Apr 28 00:43:15 2000
+++ linux-2.4/net/ipv4/netfilter/ipt_unclean.c Wed Jan 10 17:00:51 2001
@@ -112,7 +112,7 @@
limpk("ICMP error internal way too short\n");
return 0;
}
- if (datalen - 8 < inner->ihl*4 + 8) {
+ if (datalen - 8 < (inner->ihl << 2) + 8) {
limpk("ICMP error internal too short\n");
return 0;
}
@@ -155,7 +155,7 @@
u_int32_t arg = ntohl(icmph->un.gateway);

if (icmph->code == 0) {
- if ((arg >> 24) >= iph->ihl*4) {
+ if ((arg >> 24) >= (iph->ihl << 2)) {
limpk("ICMP PARAMETERPROB ptr = %u\n",
ntohl(icmph->un.gateway) >> 24);
return 0;
@@ -292,7 +292,7 @@
}

/* CHECK: Smaller than actual TCP hdr. */
- if (datalen < tcph->doff * 4) {
+ if (datalen < (tcph->doff << 2)) {
if (!embedded) {
limpk("Packet length %u < actual TCP header.\n",
datalen);
@@ -339,7 +339,7 @@
return 0;
}

- for (i = sizeof(struct tcphdr); i < tcph->doff * 4; ) {
+ for (i = sizeof(struct tcphdr); i < (tcph->doff << 2); ) {
switch (opt[i]) {
case 0:
end_of_options = 1;
@@ -356,7 +356,7 @@
return 0;
}
/* CHECK: options at tail. */
- else if (i+1 >= tcph->doff * 4) {
+ else if (i+1 >= (tcph->doff << 2)) {
limpk("TCP option %u at tail\n",
opt[i]);
return 0;
@@ -368,7 +368,7 @@
return 0;
}
/* CHECK: oversize options. */
- else if (opt[i+1] + i >= tcph->doff * 4) {
+ else if (opt[i+1] + i >= (tcph->doff << 2)) {
limpk("TCP option %u at %Zu too long\n",
(unsigned int) opt[i], i);
return 0;
@@ -393,14 +393,14 @@

/* Should only happen for local outgoing raw-socket packets. */
/* CHECK: length >= ip header. */
- if (length < sizeof(struct iphdr) || length < iph->ihl * 4) {
+ if (length < sizeof(struct iphdr) || length < (iph->ihl << 2)) {
limpk("Packet length %Zu < IP header.\n", length);
return 0;
}

offset = ntohs(iph->frag_off) & IP_OFFSET;
- protoh = (void *)iph + iph->ihl * 4;
- datalen = length - iph->ihl * 4;
+ protoh = (void *)iph + (iph->ihl << 2);
+ datalen = length - (iph->ihl << 2);

/* CHECK: Embedded fragment. */
if (embedded && offset) {
@@ -408,7 +408,7 @@
return 0;
}

- for (i = sizeof(struct iphdr); i < iph->ihl * 4; ) {
+ for (i = sizeof(struct iphdr); i < (iph->ihl << 2); ) {
switch (opt[i]) {
case 0:
end_of_options = 1;
@@ -425,7 +425,7 @@
return 0;
}
/* CHECK: options at tail. */
- else if (i+1 >= iph->ihl * 4) {
+ else if (i+1 >= (iph->ihl << 2)) {
limpk("IP option %u at tail\n",
opt[i]);
return 0;
@@ -437,7 +437,7 @@
return 0;
}
/* CHECK: oversize options. */
- else if (opt[i+1] + i >= iph->ihl * 4) {
+ else if (opt[i+1] + i >= (iph->ihl << 2)) {
limpk("IP option %u at %u too long\n",
opt[i], i);
return 0;
diff -ru linux-2.4-orig/net/ipv4/netfilter/iptable_filter.c linux-2.4/net/ipv4/netfilter/iptable_filter.c
--- linux-2.4-orig/net/ipv4/netfilter/iptable_filter.c Fri May 12 20:45:26 2000
+++ linux-2.4/net/ipv4/netfilter/iptable_filter.c Wed Jan 10 17:01:15 2001
@@ -105,7 +105,7 @@
{
/* root is playing with raw sockets. */
if ((*pskb)->len < sizeof(struct iphdr)
- || (*pskb)->nh.iph->ihl * 4 < sizeof(struct iphdr)) {
+ || ((*pskb)->nh.iph->ihl << 2) < sizeof(struct iphdr)) {
if (net_ratelimit())
printk("ipt_hook: happy cracking.\n");
return NF_ACCEPT;
diff -ru linux-2.4-orig/net/ipv4/netfilter/iptable_mangle.c linux-2.4/net/ipv4/netfilter/iptable_mangle.c
--- linux-2.4-orig/net/ipv4/netfilter/iptable_mangle.c Sat Sep 16 06:37:23 2000
+++ linux-2.4/net/ipv4/netfilter/iptable_mangle.c Wed Jan 10 17:02:25 2001
@@ -134,7 +134,7 @@

/* root is playing with raw sockets. */
if ((*pskb)->len < sizeof(struct iphdr)
- || (*pskb)->nh.iph->ihl * 4 < sizeof(struct iphdr)) {
+ || ((*pskb)->nh.iph->ihl << 2) < sizeof(struct iphdr)) {
if (net_ratelimit())
printk("ipt_hook: happy cracking.\n");
return NF_ACCEPT;
diff -ru linux-2.4-orig/net/ipv4/route.c linux-2.4/net/ipv4/route.c
--- linux-2.4-orig/net/ipv4/route.c Tue Oct 10 19:33:52 2000
+++ linux-2.4/net/ipv4/route.c Wed Jan 10 17:19:36 2001
@@ -2247,7 +2247,7 @@
#ifdef CONFIG_SMP
if (smp_num_cpus > 1 || cpu_logical_map(0) != 0) {
int i;
- int cnt = length/4;
+ int cnt = length >> 2;

for (i=0; i<smp_num_cpus; i++) {
int cpu = cpu_logical_map(i);
diff -ru linux-2.4-orig/net/ipv4/tcp.c linux-2.4/net/ipv4/tcp.c
--- linux-2.4-orig/net/ipv4/tcp.c Wed Nov 29 06:53:45 2000
+++ linux-2.4/net/ipv4/tcp.c Wed Jan 10 16:43:30 2001
@@ -1534,7 +1534,7 @@

err = 0;
if (!(flags&MSG_TRUNC)) {
- err = memcpy_toiovec(msg->msg_iov, ((unsigned char *)skb->h.th) + skb->h.th->doff*4 + offset, used);
+ err = memcpy_toiovec(msg->msg_iov, ((unsigned char *)skb->h.th) + (skb->h.th->doff << 2) + offset, used);
if (err) {
/* Exception. Bailout! */
if (!copied)
diff -ru linux-2.4-orig/net/ipv4/tcp_input.c linux-2.4/net/ipv4/tcp_input.c
--- linux-2.4-orig/net/ipv4/tcp_input.c Fri Dec 29 23:07:24 2000
+++ linux-2.4/net/ipv4/tcp_input.c Wed Jan 10 16:44:40 2001
@@ -1988,7 +1988,7 @@
{
unsigned char *ptr;
struct tcphdr *th = skb->h.th;
- int length=(th->doff*4)-sizeof(struct tcphdr);
+ int length=(th->doff << 2)-sizeof(struct tcphdr);

ptr = (unsigned char *)(th + 1);
tp->saw_tstamp = 0;
@@ -2829,8 +2829,8 @@
struct tcp_opt *tp = &(sk->tp_pinfo.af_tcp);

th = skb->h.th;
- skb_pull(skb, th->doff*4);
- skb_trim(skb, len - (th->doff*4));
+ skb_pull(skb, th->doff << 2);
+ skb_trim(skb, len - (th->doff << 2));

if (skb->len == 0 && !th->fin)
goto drop;
@@ -3052,7 +3052,7 @@

/* Do we wait for any urgent data? - normally not... */
if (tp->urg_data == TCP_URG_NOTYET) {
- u32 ptr = tp->urg_seq - ntohl(th->seq) + (th->doff*4);
+ u32 ptr = tp->urg_seq - ntohl(th->seq) + (th->doff << 2);

/* Is the urgent pointer pointing into this packet? */
if (ptr < len) {
diff -ru linux-2.4-orig/net/ipv4/tcp_ipv4.c linux-2.4/net/ipv4/tcp_ipv4.c
--- linux-2.4-orig/net/ipv4/tcp_ipv4.c Mon Jan 1 20:01:58 2001
+++ linux-2.4/net/ipv4/tcp_ipv4.c Wed Jan 10 17:20:09 2001
@@ -1117,7 +1117,7 @@
/* Swap the send and the receive. */
rep.th.dest = th->source;
rep.th.source = th->dest;
- rep.th.doff = arg.iov[0].iov_len/4;
+ rep.th.doff = arg.iov[0].iov_len >> 2;
rep.th.seq = htonl(seq);
rep.th.ack_seq = htonl(ack);
rep.th.ack = 1;
@@ -1629,7 +1629,7 @@

TCP_SKB_CB(skb)->seq = ntohl(th->seq);
TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin +
- len - th->doff*4);
+ len - (th->doff << 2));
TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq);
TCP_SKB_CB(skb)->when = 0;
TCP_SKB_CB(skb)->flags = skb->nh.iph->tos;
diff -ru linux-2.4-orig/net/ipv6/tcp_ipv6.c linux-2.4/net/ipv6/tcp_ipv6.c
--- linux-2.4-orig/net/ipv6/tcp_ipv6.c Mon Jan 1 20:01:58 2001
+++ linux-2.4/net/ipv6/tcp_ipv6.c Wed Jan 10 17:35:19 2001
@@ -1558,7 +1558,7 @@

TCP_SKB_CB(skb)->seq = ntohl(th->seq);
TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin +
- len - th->doff*4);
+ len - (th->doff << 2));
TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq);
TCP_SKB_CB(skb)->when = 0;
TCP_SKB_CB(skb)->flags = ip6_get_dsfield(skb->nh.ipv6h);
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  Last update: 2005-03-22 13:28    [from the cache]
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