Commit 68e1f188 authored by Patrick McHardy's avatar Patrick McHardy Committed by David S. Miller
Browse files

[NETFILTER]: ipt_TCPMSS: reformat 



- fix whitespace error
- break lines at 80 characters
- reformat some expressions to be more readable

Signed-off-by: default avatarPatrick McHardy <kaber@trash.net>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 50b9f1d5

net/ipv4/netfilter/ipt_TCPMSS.c

+31 −27
Original line number Diff line number Diff line
@@ -31,8 +31,10 @@ static inline unsigned int 
optlen(const u_int8_t *opt, unsigned int offset)

{

	/* Beware zero-length options: make finite progress */

	if (opt[offset] <= TCPOPT_NOP || opt[offset+1] == 0) return 1;

	else return opt[offset+1];

	if (opt[offset] <= TCPOPT_NOP || opt[offset+1] == 0)

		return 1;

	else

		return opt[offset+1];

}



static unsigned int
@@ -55,7 +57,6 @@ ipt_tcpmss_target(struct sk_buff **pskb, 


	iph = (*pskb)->nh.iph;

	tcplen = (*pskb)->len - iph->ihl*4;



	tcph = (void *)iph + iph->ihl*4;



	/* Since it passed flags test in tcp match, we know it is is
@@ -74,33 +75,35 @@ ipt_tcpmss_target(struct sk_buff **pskb, 
	if (tcpmssinfo->mss == IPT_TCPMSS_CLAMP_PMTU) {

		if (!(*pskb)->dst) {

			if (net_ratelimit())

				printk(KERN_ERR

			       		"ipt_tcpmss_target: no dst?! can't determine path-MTU\n");

				printk(KERN_ERR "ipt_tcpmss_target: "

				       "no dst?! can't determine path-MTU\n");

			return NF_DROP; /* or IPT_CONTINUE ?? */

		}



		if(dst_mtu((*pskb)->dst) <= (sizeof(struct iphdr) + sizeof(struct tcphdr))) {

		if (dst_mtu((*pskb)->dst) <= sizeof(struct iphdr) +

					     sizeof(struct tcphdr)) {

			if (net_ratelimit())

				printk(KERN_ERR

		       			"ipt_tcpmss_target: unknown or invalid path-MTU (%d)\n", dst_mtu((*pskb)->dst));

				printk(KERN_ERR "ipt_tcpmss_target: "

				       "unknown or invalid path-MTU (%d)\n",

				       dst_mtu((*pskb)->dst));

			return NF_DROP; /* or IPT_CONTINUE ?? */

		}



		newmss = dst_mtu((*pskb)->dst) - sizeof(struct iphdr) - sizeof(struct tcphdr);

		newmss = dst_mtu((*pskb)->dst) - sizeof(struct iphdr) -

						 sizeof(struct tcphdr);

	} else

		newmss = tcpmssinfo->mss;



 	opt = (u_int8_t *)tcph;

	for (i = sizeof(struct tcphdr); i < tcph->doff*4; i += optlen(opt, i)) {

		if ((opt[i] == TCPOPT_MSS) &&

		    ((tcph->doff*4 - i) >= TCPOLEN_MSS) &&

		    (opt[i+1] == TCPOLEN_MSS)) {

		if (opt[i] == TCPOPT_MSS && tcph->doff*4 - i >= TCPOLEN_MSS &&

		    opt[i+1] == TCPOLEN_MSS) {

			u_int16_t oldmss;



			oldmss = (opt[i+2] << 8) | opt[i+3];



			if((tcpmssinfo->mss == IPT_TCPMSS_CLAMP_PMTU) &&

				(oldmss <= newmss))

			if (tcpmssinfo->mss == IPT_TCPMSS_CLAMP_PMTU &&

			    oldmss <= newmss)

				return IPT_CONTINUE;



			opt[i+2] = (newmss & 0xff00) >> 8;
@@ -193,9 +196,9 @@ static inline int find_syn_match(const struct ipt_entry_match *m) 
{

	const struct ipt_tcp *tcpinfo = (const struct ipt_tcp *)m->data;



	if (strcmp(m->u.kernel.match->name, "tcp") == 0

	    && (tcpinfo->flg_cmp & TH_SYN)

	    && !(tcpinfo->invflags & IPT_TCP_INV_FLAGS))

	if (strcmp(m->u.kernel.match->name, "tcp") == 0 &&

	    tcpinfo->flg_cmp & TH_SYN &&

	    !(tcpinfo->invflags & IPT_TCP_INV_FLAGS))

		return 1;



	return 0;
@@ -212,11 +215,12 @@ ipt_tcpmss_checkentry(const char *tablename, 
	const struct ipt_tcpmss_info *tcpmssinfo = targinfo;

	const struct ipt_entry *e = e_void;



	if((tcpmssinfo->mss == IPT_TCPMSS_CLAMP_PMTU) && 

			((hook_mask & ~((1 << NF_IP_FORWARD)

			   	| (1 << NF_IP_LOCAL_OUT)

			   	| (1 << NF_IP_POST_ROUTING))) != 0)) {

		printk("TCPMSS: path-MTU clamping only supported in FORWARD, OUTPUT and POSTROUTING hooks\n");

	if (tcpmssinfo->mss == IPT_TCPMSS_CLAMP_PMTU &&

	    (hook_mask & ~((1 << NF_IP_FORWARD) |

			   (1 << NF_IP_LOCAL_OUT) |

			   (1 << NF_IP_POST_ROUTING))) != 0) {

		printk("TCPMSS: path-MTU clamping only supported in "

		       "FORWARD, OUTPUT and POSTROUTING hooks\n");

		return 0;

	}

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