tag	line	file	source code
iph	110	arch/alpha/lib/checksum.c	unsigned short ip_fast_csum(unsigned char * iph, unsigned int ihl)
iph	112	arch/alpha/lib/checksum.c	return ~do_csum(iph,ihl*4);
iph	1146	drivers/net/ppp.c	struct iphdr *iph = (struct iphdr *) c;
iph	1148	drivers/net/ppp.c	iph->saddr, iph->daddr, count))
iph	1794	drivers/net/ppp.c	struct iphdr *iph = (struct iphdr *)skb->data;
iph	1796	drivers/net/ppp.c	dev->name, (int) proto, (int) len, (int) iph->saddr,
iph	1797	drivers/net/ppp.c	(int) iph->daddr, (int) iph->protocol))
iph	125	drivers/net/tunnel.c	struct iphdr *iph;    /* Our new IP header */
iph	161	drivers/net/tunnel.c	iph=(struct iphdr *)skb->data;
iph	162	drivers/net/tunnel.c	if ( iph->version != 4 )
iph	167	drivers/net/tunnel.c	printk("%s: Bad IP packet: ip version %d\n", dev->name, iph->version);
iph	178	drivers/net/tunnel.c	if ( iph->protocol == IPPROTO_IPIP && iph->saddr == dev->pa_addr )
iph	189	drivers/net/tunnel.c	if ( iph->daddr == dev->pa_addr )
iph	199	drivers/net/tunnel.c	print_ip(iph);
iph	219	drivers/net/tunnel.c	iph=skb2->h.iph=(struct iphdr *)skb2->data;
iph	220	drivers/net/tunnel.c	memcpy(skb2->h.iph, skb->data, ip_header_len );
iph	226	drivers/net/tunnel.c	++iph->ttl;  /* Note: ip_forward() decrements ttl, so compensate */
iph	227	drivers/net/tunnel.c	iph->saddr = dev->pa_addr;
iph	228	drivers/net/tunnel.c	iph->daddr = dev->pa_dstaddr;
iph	229	drivers/net/tunnel.c	iph->protocol = IPPROTO_IPIP;
iph	230	drivers/net/tunnel.c	iph->ihl = 5;
iph	231	drivers/net/tunnel.c	iph->tot_len = htons(skb2->len);
iph	232	drivers/net/tunnel.c	iph->frag_off = 0;
iph	236	drivers/net/tunnel.c	iph->check = 0;
iph	237	drivers/net/tunnel.c	iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
iph	241	drivers/net/tunnel.c	print_ip(iph);
iph	247	drivers/net/tunnel.c	ip_forward(skb2, dev, 0, iph->daddr, 0);
iph	9	include/asm-alpha/checksum.h	extern unsigned short ip_fast_csum(unsigned char * iph, unsigned int ihl);
iph	45	include/asm-i386/checksum.h	static inline unsigned short ip_fast_csum(unsigned char * iph,
iph	68	include/asm-i386/checksum.h	: "=&r" (sum), "=&r" (iph), "=&r" (ihl)
iph	69	include/asm-i386/checksum.h	: "1" (iph), "2" (ihl));
iph	54	include/linux/skbuff.h	struct iphdr  *iph;
iph	79	include/net/head_explode.h	extern __inline__ unsigned char *ip_explode(unsigned char *iph, struct ip_header *ip)
iph	81	include/net/head_explode.h	ip->version=*iph>>4;    /* Avoid the shift. We do our equality checks shifted too */
iph	82	include/net/head_explode.h	ip->ihl=(*iph++)&0xF;    /* Length in long words */
iph	83	include/net/head_explode.h	ip->tos=*iph++;      /* Service type */
iph	84	include/net/head_explode.h	iph=exp_getu16(iph,&ip->tot_len);  /* Length of packet */
iph	85	include/net/head_explode.h	iph=exp_getu16(iph,&ip->id);    /* Packet identity */
iph	86	include/net/head_explode.h	iph=exp_getu16(iph,&ip->frag_off);  /* Fragment offset */
iph	87	include/net/head_explode.h	ip->ttl=*iph++;
iph	88	include/net/head_explode.h	ip->protocol=*iph++;
iph	89	include/net/head_explode.h	iph=exp_getn16(iph,&ip->check);
iph	90	include/net/head_explode.h	iph=exp_getn32(iph,&ip->saddr);
iph	91	include/net/head_explode.h	iph=exp_getn32(iph,&ip->daddr);
iph	92	include/net/head_explode.h	return iph;
iph	65	include/net/ip.h	struct iphdr  *iph;    /* pointer to IP header      */
iph	104	net/ipv4/icmp.c	struct iphdr *iph;
iph	116	net/ipv4/icmp.c	iph = (struct iphdr *) skb_in->data;
iph	129	net/ipv4/icmp.c	atype=ip_chk_addr(iph->daddr);
iph	137	net/ipv4/icmp.c	if(ntohs(iph->frag_off)&IP_OFFSET)
iph	151	net/ipv4/icmp.c	if(iph->protocol==IPPROTO_ICMP)
iph	153	net/ipv4/icmp.c	icmph = (struct icmphdr *) ((char *) iph +
iph	154	net/ipv4/icmp.c	4 * iph->ihl);
iph	230	net/ipv4/icmp.c	if (iph->daddr != our_addr && ip_chk_addr(iph->daddr) == IS_MYADDR)
iph	231	net/ipv4/icmp.c	our_addr = iph->daddr;
iph	232	net/ipv4/icmp.c	offset = ip_build_header(skb, our_addr, iph->saddr,
iph	260	net/ipv4/icmp.c	memcpy(icmph + 1, iph, sizeof(struct iphdr) + 8);
iph	279	net/ipv4/icmp.c	struct iphdr *iph;
iph	284	net/ipv4/icmp.c	iph = (struct iphdr *) (icmph + 1);
iph	295	net/ipv4/icmp.c	in_ntoa(iph->daddr), ntohs(iph->protocol));
iph	303	net/ipv4/icmp.c	in_ntoa(iph->daddr));
iph	308	net/ipv4/icmp.c	printk("ICMP: %s: Source Route Failed.\n", in_ntoa(iph->daddr));
iph	319	net/ipv4/icmp.c	hash = iph->protocol & (MAX_INET_PROTOS -1);
iph	335	net/ipv4/icmp.c	if (iph->protocol == ipprot->protocol && ipprot->err_handler)
iph	338	net/ipv4/icmp.c	iph->daddr, iph->saddr, ipprot);
iph	357	net/ipv4/icmp.c	struct iphdr *iph;
iph	364	net/ipv4/icmp.c	iph = (struct iphdr *) (icmph + 1);
iph	365	net/ipv4/icmp.c	ip = iph->daddr;
iph	215	net/ipv4/ip.c	struct iphdr *iph;
iph	309	net/ipv4/ip.c	iph=(struct iphdr *)skb_put(skb,sizeof(struct iphdr));
iph	311	net/ipv4/ip.c	iph->version  = 4;
iph	312	net/ipv4/ip.c	iph->ihl      = 5;
iph	313	net/ipv4/ip.c	iph->tos      = tos;
iph	314	net/ipv4/ip.c	iph->frag_off = 0;
iph	315	net/ipv4/ip.c	iph->ttl      = ttl;
iph	316	net/ipv4/ip.c	iph->daddr    = daddr;
iph	317	net/ipv4/ip.c	iph->saddr    = saddr;
iph	318	net/ipv4/ip.c	iph->protocol = type;
iph	319	net/ipv4/ip.c	skb->ip_hdr   = iph;
iph	329	net/ipv4/ip.c	void ip_send_check(struct iphdr *iph)
iph	331	net/ipv4/ip.c	iph->check = 0;
iph	332	net/ipv4/ip.c	iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
iph	377	net/ipv4/ip.c	static struct ipq *ip_find(struct iphdr *iph)
iph	386	net/ipv4/ip.c	if (iph->id== qp->iph->id && iph->saddr == qp->iph->saddr &&
iph	387	net/ipv4/ip.c	iph->daddr == qp->iph->daddr && iph->protocol == qp->iph->protocol)
iph	444	net/ipv4/ip.c	kfree_s(qp->iph, 64 + 8);
iph	487	net/ipv4/ip.c	static struct ipq *ip_create(struct sk_buff *skb, struct iphdr *iph, struct device *dev)
iph	505	net/ipv4/ip.c	ihlen = iph->ihl * 4;
iph	506	net/ipv4/ip.c	qp->iph = (struct iphdr *) kmalloc(64 + 8, GFP_ATOMIC);
iph	507	net/ipv4/ip.c	if (qp->iph == NULL)
iph	514	net/ipv4/ip.c	memcpy(qp->iph, iph, ihlen + 8);
iph	578	net/ipv4/ip.c	struct iphdr *iph;
iph	603	net/ipv4/ip.c	memcpy(ptr, ((unsigned char *) qp->iph), qp->ihlen);
iph	629	net/ipv4/ip.c	iph = skb->h.iph;
iph	630	net/ipv4/ip.c	iph->frag_off = 0;
iph	631	net/ipv4/ip.c	iph->tot_len = htons((iph->ihl * 4) + count);
iph	632	net/ipv4/ip.c	skb->ip_hdr = iph;
iph	643	net/ipv4/ip.c	static struct sk_buff *ip_defrag(struct iphdr *iph, struct sk_buff *skb, struct device *dev)
iph	656	net/ipv4/ip.c	qp = ip_find(iph);
iph	659	net/ipv4/ip.c	offset = ntohs(iph->frag_off);
iph	690	net/ipv4/ip.c	if ((qp = ip_create(skb, iph, dev)) == NULL)
iph	703	net/ipv4/ip.c	ihl = iph->ihl * 4;
iph	704	net/ipv4/ip.c	end = offset + ntohs(iph->tot_len) - ihl;
iph	839	net/ipv4/ip.c	struct iphdr *iph;
iph	852	net/ipv4/ip.c	iph = (struct iphdr *) (raw + dev->hard_header_len);
iph	854	net/ipv4/ip.c	skb->ip_hdr = iph;
iph	860	net/ipv4/ip.c	hlen = iph->ihl * 4;
iph	861	net/ipv4/ip.c	left = ntohs(iph->tot_len) - hlen;  /* Space per frame */
iph	870	net/ipv4/ip.c	if (ntohs(iph->frag_off) & IP_DF)
iph	904	net/ipv4/ip.c	offset = (ntohs(iph->frag_off) & IP_OFFSET) << 3;
iph	979	net/ipv4/ip.c	iph = (struct iphdr *)(skb2->h.raw/*+dev->hard_header_len*/);
iph	980	net/ipv4/ip.c	iph->frag_off = htons((offset >> 3));
iph	986	net/ipv4/ip.c	iph->frag_off |= htons(IP_MF);
iph	1012	net/ipv4/ip.c	struct iphdr *iph;  /* Our header */
iph	1026	net/ipv4/ip.c	if(!(is_frag&4) && (fw_res=ip_fw_chk(skb->h.iph, dev, ip_fw_fwd_chain, ip_fw_fwd_policy, 0))!=1)
iph	1044	net/ipv4/ip.c	iph = skb->h.iph;
iph	1045	net/ipv4/ip.c	iph->ttl--;
iph	1053	net/ipv4/ip.c	iph->check = ntohs(iph->check) + 0x0100;
iph	1054	net/ipv4/ip.c	if ((iph->check & 0xFF00) == 0)
iph	1055	net/ipv4/ip.c	iph->check++;    /* carry overflow */
iph	1056	net/ipv4/ip.c	iph->check = htons(iph->check);
iph	1058	net/ipv4/ip.c	if (iph->ttl <= 0)
iph	1137	net/ipv4/ip.c	if (dev == dev2 && !((iph->saddr^iph->daddr)&dev->pa_mask) && rt->rt_flags&RTF_MODIFIED)
iph	1210	net/ipv4/ip.c	ip_fw_chk(iph,dev,ip_acct_chain,IP_FW_F_ACCEPT,1);
iph	1218	net/ipv4/ip.c	if(iph->tos & IPTOS_LOWDELAY)
iph	1220	net/ipv4/ip.c	else if(iph->tos & IPTOS_THROUGHPUT)
iph	1240	net/ipv4/ip.c	struct iphdr *iph = skb->h.iph;
iph	1259	net/ipv4/ip.c	skb->ip_hdr = iph;
iph	1274	net/ipv4/ip.c	if (skb->len<sizeof(struct iphdr) || iph->ihl<5 || iph->version != 4 || ip_fast_csum((unsigned char *)iph, iph->ihl) !=0
iph	1275	net/ipv4/ip.c	|| skb->len < ntohs(iph->tot_len))
iph	1287	net/ipv4/ip.c	skb_trim(skb,ntohs(iph->tot_len));
iph	1295	net/ipv4/ip.c	if ((err=ip_fw_chk(iph,dev,ip_fw_blk_chain,ip_fw_blk_policy, 0))<1)
iph	1311	net/ipv4/ip.c	target_addr = iph->daddr;
iph	1313	net/ipv4/ip.c	if (iph->ihl != 5)
iph	1325	net/ipv4/ip.c	int opt_space=4*(iph->ihl-5);
iph	1367	net/ipv4/ip.c	if (iph->daddr!=skb->dev->pa_addr && (brd = ip_chk_addr(iph->daddr)) == 0)
iph	1371	net/ipv4/ip.c	if(ip_chk_addr(iph->daddr))
iph	1387	net/ipv4/ip.c	if(ip_chk_addr(iph->daddr))
iph	1416	net/ipv4/ip.c	if(iph->frag_off)
iph	1418	net/ipv4/ip.c	if (iph->frag_off & htons(IP_MF))
iph	1424	net/ipv4/ip.c	if (iph->frag_off & htons(IP_OFFSET))
iph	1440	net/ipv4/ip.c	if ( iph->daddr == skb->dev->pa_addr || (brd = ip_chk_addr(iph->daddr)) != 0)
iph	1444	net/ipv4/ip.c	if(brd==IS_MULTICAST && iph->daddr!=IGMP_ALL_HOSTS && !(dev->flags&IFF_LOOPBACK))
iph	1457	net/ipv4/ip.c	if(ip_mc->multiaddr==iph->daddr)
iph	1471	net/ipv4/ip.c	struct iphdr *iph=skb->h.iph;
iph	1472	net/ipv4/ip.c	ip_forward(skb, dev, is_frag|4, iph->daddr, 0);
iph	1483	net/ipv4/ip.c	ip_fw_chk(iph,dev,ip_acct_chain,IP_FW_F_ACCEPT,1);
iph	1493	net/ipv4/ip.c	skb=ip_defrag(iph,skb,dev);
iph	1497	net/ipv4/ip.c	iph=skb->h.iph;
iph	1504	net/ipv4/ip.c	skb->ip_hdr = iph;
iph	1505	net/ipv4/ip.c	skb->h.raw += iph->ihl*4;
iph	1513	net/ipv4/ip.c	hash = iph->protocol & (SOCK_ARRAY_SIZE-1);
iph	1523	net/ipv4/ip.c	raw_sk=get_sock_raw(raw_sk, hash,  iph->saddr, iph->daddr);
iph	1529	net/ipv4/ip.c	sknext=get_sock_raw(raw_sk->next, hash, iph->saddr, iph->daddr);
iph	1535	net/ipv4/ip.c	raw_rcv(raw_sk, skb1, dev, iph->saddr,iph->daddr);
iph	1554	net/ipv4/ip.c	hash = iph->protocol & (MAX_INET_PROTOS -1);
iph	1559	net/ipv4/ip.c	if (ipprot->protocol != iph->protocol)
iph	1586	net/ipv4/ip.c	ipprot->handler(skb2, dev, NULL, iph->daddr,
iph	1587	net/ipv4/ip.c	(ntohs(iph->tot_len) - (iph->ihl * 4)),
iph	1588	net/ipv4/ip.c	iph->saddr, 0, ipprot);
iph	1600	net/ipv4/ip.c	raw_rcv(raw_sk, skb, dev, iph->saddr, iph->daddr);
iph	1711	net/ipv4/ip.c	struct iphdr *iph;
iph	1741	net/ipv4/ip.c	iph = (struct iphdr *)ptr;
iph	1742	net/ipv4/ip.c	skb->ip_hdr = iph;
iph	1743	net/ipv4/ip.c	iph->tot_len = ntohs(skb->len-dev->hard_header_len);
iph	1746	net/ipv4/ip.c	if(ip_fw_chk(iph, dev, ip_fw_blk_chain, ip_fw_blk_policy, 0) != 1)
iph	1756	net/ipv4/ip.c	iph->id      = htons(ip_id_count++);
iph	1784	net/ipv4/ip.c	ip_send_check(iph);
iph	1848	net/ipv4/ip.c	ip_fw_chk(iph,dev,ip_acct_chain,IP_FW_F_ACCEPT,1);
iph	1857	net/ipv4/ip.c	if (MULTICAST(iph->daddr) && !(dev->flags&IFF_LOOPBACK))
iph	1861	net/ipv4/ip.c	if(iph->daddr==IGMP_ALL_HOSTS)
iph	1868	net/ipv4/ip.c	if(imc->multiaddr==iph->daddr)
iph	1886	net/ipv4/ip.c	if((dev->flags&IFF_BROADCAST) && iph->daddr==dev->pa_brdaddr && !(dev->flags&IFF_LOOPBACK))
iph	2332	net/ipv4/ip.c	struct iphdr *iph;
iph	2518	net/ipv4/ip.c	iph = (struct iphdr *)data;
iph	2527	net/ipv4/ip.c	iph->version = 4;
iph	2528	net/ipv4/ip.c	iph->ihl = 5; /* ugh */
iph	2529	net/ipv4/ip.c	iph->tos = sk->ip_tos;
iph	2530	net/ipv4/ip.c	iph->tot_len = htons(fraglen - fragheaderlen + iph->ihl*4);
iph	2531	net/ipv4/ip.c	iph->id = id;
iph	2532	net/ipv4/ip.c	iph->frag_off = htons(offset>>3);
iph	2533	net/ipv4/ip.c	iph->frag_off |= mf;
iph	2536	net/ipv4/ip.c	iph->ttl = sk->ip_mc_ttl;
iph	2539	net/ipv4/ip.c	iph->ttl = sk->ip_ttl;
iph	2540	net/ipv4/ip.c	iph->protocol = type;
iph	2541	net/ipv4/ip.c	iph->check = 0;
iph	2542	net/ipv4/ip.c	iph->saddr = saddr;
iph	2543	net/ipv4/ip.c	iph->daddr = daddr;
iph	2544	net/ipv4/ip.c	iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
iph	2545	net/ipv4/ip.c	data += iph->ihl*4;
iph	2566	net/ipv4/ip.c	ip_fw_chk(iph, dev, ip_acct_chain, IP_FW_F_ACCEPT, 1);
iph	520	net/ipv4/ip_fw.c	struct iphdr *iph = skb->h.iph;
iph	521	net/ipv4/ip_fw.c	struct tcphdr *th = (struct tcphdr *)&(((char *)iph)[iph->ihl*4]);
iph	580	net/ipv4/ip_fw.c	ms->dst      = iph->daddr;
iph	657	net/ipv4/ip_fw.c	struct iphdr  *iph = skb->h.iph;
iph	666	net/ipv4/ip_fw.c	if (iph->protocol!=IPPROTO_UDP && iph->protocol!=IPPROTO_TCP)
iph	673	net/ipv4/ip_fw.c	portptr = (unsigned short *)&(((char *)iph)[iph->ihl*4]);
iph	678	net/ipv4/ip_fw.c	strProt[iph->protocol==IPPROTO_TCP],
iph	679	net/ipv4/ip_fw.c	ntohl(iph->saddr), ntohs(portptr[0]),
iph	680	net/ipv4/ip_fw.c	ntohl(iph->daddr), ntohs(portptr[1]));
iph	684	net/ipv4/ip_fw.c	if (iph->protocol == ms->protocol &&
iph	685	net/ipv4/ip_fw.c	iph->saddr == ms->src   && iph->daddr == ms->dst &&
iph	706	net/ipv4/ip_fw.c	ms->protocol = iph->protocol;
iph	707	net/ipv4/ip_fw.c	ms->src      = iph->saddr;
iph	708	net/ipv4/ip_fw.c	ms->dst      = iph->daddr;
iph	718	net/ipv4/ip_fw.c	iph->saddr = dev->pa_addr; /* my own address */
iph	725	net/ipv4/ip_fw.c	if (iph->protocol==IPPROTO_UDP)
iph	728	net/ipv4/ip_fw.c	recalc_check((struct udphdr *)portptr,iph->saddr,iph->daddr,size);
iph	737	net/ipv4/ip_fw.c	iph = skb->h.iph;
iph	738	net/ipv4/ip_fw.c	portptr = (unsigned short *)&(((char *)iph)[iph->ihl*4]);
iph	752	net/ipv4/ip_fw.c	tcp_send_check(th,iph->saddr,iph->daddr,size,skb->sk);
iph	755	net/ipv4/ip_fw.c	ip_send_check(iph);
iph	773	net/ipv4/ip_fw.c	struct iphdr  *iph = skb_ptr->h.iph;
iph	776	net/ipv4/ip_fw.c	struct tcphdr   *th = (struct tcphdr *)(skb_ptr->h.raw+(iph->ihl<<2));
iph	778	net/ipv4/ip_fw.c	if (iph->protocol!=IPPROTO_UDP && iph->protocol!=IPPROTO_TCP)
iph	781	net/ipv4/ip_fw.c	portptr = (unsigned short *)&(((char *)iph)[iph->ihl*4]);
iph	788	net/ipv4/ip_fw.c	strProt[iph->protocol==IPPROTO_TCP],
iph	789	net/ipv4/ip_fw.c	ntohl(iph->saddr), ntohs(portptr[0]),
iph	790	net/ipv4/ip_fw.c	ntohl(iph->daddr), ntohs(portptr[1]));
iph	804	net/ipv4/ip_fw.c	if (iph->protocol==ms->protocol &&
iph	805	net/ipv4/ip_fw.c	(iph->saddr==ms->dst || iph->protocol==IPPROTO_UDP) &&
iph	810	net/ipv4/ip_fw.c	iph->daddr = ms->src;
iph	816	net/ipv4/ip_fw.c	if (iph->protocol==IPPROTO_UDP)
iph	817	net/ipv4/ip_fw.c	recalc_check((struct udphdr *)portptr,iph->saddr,iph->daddr,size);
iph	829	net/ipv4/ip_fw.c	tcp_send_check((struct tcphdr *)portptr,iph->saddr,iph->daddr,size,skb_ptr->sk);
iph	831	net/ipv4/ip_fw.c	ip_send_check(iph);
iph	833	net/ipv4/ip_fw.c	printk("I-routed to %lX:%X\n",ntohl(iph->daddr),ntohs(portptr[1]));
iph	1192	net/ipv4/ip_fw.c	void ip_acct_cnt(struct iphdr *iph, struct device *dev, struct ip_fw *f)
iph	1194	net/ipv4/ip_fw.c	(void) ip_fw_chk(iph, dev, f, 0, 1);
iph	144	net/ipv4/raw.c	struct iphdr *iph=(struct iphdr *)to;
iph	145	net/ipv4/raw.c	iph->saddr=saddr;
iph	146	net/ipv4/raw.c	iph->check=0;
iph	147	net/ipv4/raw.c	iph->tot_len=htons(fraglen);  /* This is right as you cant frag
iph	153	net/ipv4/raw.c	iph->id = htons(ip_id_count++);
iph	154	net/ipv4/raw.c	iph->check=ip_fast_csum((unsigned char *)iph, iph->ihl);
iph	449	net/ipv4/tcp.c	struct iphdr *iph;
iph	465	net/ipv4/tcp.c	iph = (struct iphdr *)(skb->data + dev->hard_header_len);
iph	466	net/ipv4/tcp.c	th = (struct tcphdr *)(((char *)iph) + (iph->ihl << 2));
iph	477	net/ipv4/tcp.c	iph->id = htons(ip_id_count++);
iph	478	net/ipv4/tcp.c	ip_send_check(iph);
iph	811	net/ipv4/tcp.c	struct iphdr *iph=(struct iphdr *)header;
iph	813	net/ipv4/tcp.c	header+=4*iph->ihl;
iph	3028	net/ipv4/tcp.c	struct iphdr *iph;
iph	3037	net/ipv4/tcp.c	iph = (struct iphdr *)(skb->data +
iph	3039	net/ipv4/tcp.c	th = (struct tcphdr *)(((char *)iph) +(iph->ihl << 2));
iph	4904	net/ipv4/tcp.c	struct iphdr *iph;
iph	4920	net/ipv4/tcp.c	iph = (struct iphdr *)(skb->data + skb->dev->hard_header_len);
iph	4921	net/ipv4/tcp.c	th = (struct tcphdr *)(((char *)iph) +(iph->ihl << 2));
iph	4928	net/ipv4/tcp.c	(iph->ihl << 2) +
iph	4981	net/ipv4/tcp.c	(iph->ihl << 2) + th->doff * 4;