/*
* Add an ip header to a skbuff and send it out.
*
*/
int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk,
__be32 saddr, __be32 daddr, struct ip_options_rcu *opt)
{
struct inet_sock *inet = inet_sk(sk);
struct rtable *rt = skb_rtable(skb);
struct iphdr *iph;
/* Build the IP header. */
skb_push(skb, sizeof(struct iphdr) + (opt ? opt->opt.optlen : 0));
skb_reset_network_header(skb);
iph = ip_hdr(skb);
iph->version = 4;
iph->ihl = 5;
iph->tos = inet->tos;
if (ip_dont_fragment(sk, &rt->dst))
iph->frag_off = htons(IP_DF);
else
iph->frag_off = 0;
iph->ttl = ip_select_ttl(inet, &rt->dst);
iph->daddr = (opt && opt->opt.srr ? opt->opt.faddr : daddr);
iph->saddr = saddr;
iph->protocol = sk->sk_protocol;
ip_select_ident(skb, sk);
if (opt && opt->opt.optlen) {
iph->ihl += opt->opt.optlen>>2;
ip_options_build(skb, &opt->opt, daddr, rt, 0);
}
/*
* Add an ip header to a skbuff and send it out.
*
*/
int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk,
u32 saddr, u32 daddr, struct ip_options *opt)
{
struct inet_sock *inet = inet_sk(sk);
struct rtable *rt = (struct rtable *)skb->dst;
struct iphdr *iph;
/* Build the IP header. */
if (opt)
iph=(struct iphdr *)skb_push(skb,sizeof(struct iphdr) + opt->optlen);
else
iph=(struct iphdr *)skb_push(skb,sizeof(struct iphdr));
iph->version = 4;
iph->ihl = 5;
iph->tos = inet->tos;
if (ip_dont_fragment(sk, &rt->u.dst))
iph->frag_off = htons(IP_DF);
else
iph->frag_off = 0;
iph->ttl = ip_select_ttl(inet, &rt->u.dst);
iph->daddr = rt->rt_dst;
iph->saddr = rt->rt_src;
iph->protocol = sk->sk_protocol;
iph->tot_len = htons(skb->len);
ip_select_ident(iph, &rt->u.dst, sk);
skb->nh.iph = iph;
if (opt && opt->optlen) {
iph->ihl += opt->optlen>>2;
ip_options_build(skb, opt, daddr, rt, 0);
}
int ip_build_xmit(struct sock *sk,
void getfrag (const void *,
__u32,
char *,
unsigned int,
unsigned int),
const void *frag,
unsigned short int length,
__u32 daddr,
__u32 user_saddr,
struct options * opt,
int flags,
int type,
int noblock)
{
struct rtable *rt;
unsigned int fraglen, maxfraglen, fragheaderlen;
int offset, mf;
__u32 saddr;
unsigned short id;
struct iphdr *iph;
__u32 raddr;
struct device *dev = NULL;
struct hh_cache * hh=NULL;
int nfrags=0;
__u32 true_daddr = daddr;
if (opt && opt->srr && !sk->ip_hdrincl)
daddr = opt->faddr;
ip_statistics.IpOutRequests++;
#ifdef CONFIG_IP_MULTICAST
if(MULTICAST(daddr) && *sk->ip_mc_name)
{
dev=dev_get(sk->ip_mc_name);
if(!dev)
return -ENODEV;
rt=NULL;
if (sk->saddr && (!LOOPBACK(sk->saddr) || LOOPBACK(daddr)))
saddr = sk->saddr;
else
saddr = dev->pa_addr;
}
else
{
#endif
rt = ip_check_route(&sk->ip_route_cache, daddr,
sk->localroute || (flags&MSG_DONTROUTE) ||
(opt && opt->is_strictroute), sk->bound_device);
if (rt == NULL)
{
ip_statistics.IpOutNoRoutes++;
return(-ENETUNREACH);
}
saddr = rt->rt_src;
hh = rt->rt_hh;
if (sk->saddr && (!LOOPBACK(sk->saddr) || LOOPBACK(daddr)))
saddr = sk->saddr;
dev=rt->rt_dev;
#ifdef CONFIG_IP_MULTICAST
}
if (rt && !dev)
dev = rt->rt_dev;
#endif
if (user_saddr)
saddr = user_saddr;
raddr = rt ? rt->rt_gateway : daddr;
/*
* Now compute the buffer space we require
*/
/*
* Try the simple case first. This leaves broadcast, multicast, fragmented frames, and by
* choice RAW frames within 20 bytes of maximum size(rare) to the long path
*/
if (!sk->ip_hdrincl) {
length += sizeof(struct iphdr);
if (opt) {
/* make sure not to exceed maximum packet size */
if (0xffff - length < opt->optlen)
return -EMSGSIZE;
length += opt->optlen;
}
}
if(length <= dev->mtu && !MULTICAST(daddr) && daddr!=0xFFFFFFFF && daddr!=dev->pa_brdaddr)
{
int error;
struct sk_buff *skb=sock_alloc_send_skb(sk, length+15+dev->hard_header_len,0, noblock, &error);
if(skb==NULL)
{
ip_statistics.IpOutDiscards++;
return error;
}
skb->dev=dev;
skb->protocol = htons(ETH_P_IP);
skb->free=1;
skb->when=jiffies;
skb->sk=sk;
skb->arp=0;
skb->saddr=saddr;
skb->raddr = raddr;
skb_reserve(skb,(dev->hard_header_len+15)&~15);
if (hh)
{
skb->arp=1;
memcpy(skb_push(skb,dev->hard_header_len),hh->hh_data,dev->hard_header_len);
if (!hh->hh_uptodate)
{
skb->arp = 0;
#if RT_CACHE_DEBUG >= 2
printk("ip_build_xmit: hh miss %08x via %08x\n", rt->rt_dst, rt->rt_gateway);
#endif
}
}
else if(dev->hard_header)
{
if(dev->hard_header(skb,dev,ETH_P_IP,NULL,NULL,0)>0)
skb->arp=1;
}
else
skb->arp=1;
skb->ip_hdr=iph=(struct iphdr *)skb_put(skb,length);
dev_lock_list();
if(!sk->ip_hdrincl)
{
iph->version=4;
iph->ihl=5;
iph->tos=sk->ip_tos;
iph->tot_len = htons(length);
iph->id=htons(ip_id_count++);
iph->frag_off = 0;
iph->ttl=sk->ip_ttl;
iph->protocol=type;
iph->saddr=saddr;
iph->daddr=daddr;
if (opt)
{
iph->ihl += opt->optlen>>2;
ip_options_build(skb, opt,
true_daddr, dev->pa_addr, 0);
}
iph->check=0;
iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
getfrag(frag,saddr,((char *)iph)+iph->ihl*4,0, length-iph->ihl*4);
}
/*
* This routine builds the appropriate hardware/IP headers for
* the routine. It assumes that if *dev != NULL then the
* protocol knows what it's doing, otherwise it uses the
* routing/ARP tables to select a device struct.
*/
int ip_build_header(struct sk_buff *skb, __u32 saddr, __u32 daddr,
struct device **dev, int type, struct options *opt,
int len, int tos, int ttl, struct rtable ** rp)
{
struct rtable *rt;
__u32 raddr;
int tmp;
struct iphdr *iph;
__u32 final_daddr = daddr;
if (opt && opt->srr)
daddr = opt->faddr;
/*
* See if we need to look up the device.
*/
#ifdef CONFIG_IP_MULTICAST
if(MULTICAST(daddr) && *dev==NULL && skb->sk && *skb->sk->ip_mc_name)
*dev=dev_get(skb->sk->ip_mc_name);
#endif
if (rp)
{
rt = ip_check_route(rp, daddr, skb->localroute, *dev);
/*
* If rp != NULL rt_put following below should not
* release route, so that...
*/
if (rt)
atomic_inc(&rt->rt_refcnt);
}
else
rt = ip_rt_route(daddr, skb->localroute, *dev);
if (*dev == NULL)
{
if (rt == NULL)
{
ip_statistics.IpOutNoRoutes++;
return(-ENETUNREACH);
}
*dev = rt->rt_dev;
}
if ((LOOPBACK(saddr) && !LOOPBACK(daddr)) || !saddr)
saddr = rt ? rt->rt_src : (*dev)->pa_addr;
raddr = rt ? rt->rt_gateway : daddr;
if (opt && opt->is_strictroute && rt && (rt->rt_flags & RTF_GATEWAY))
{
ip_rt_put(rt);
ip_statistics.IpOutNoRoutes++;
return -ENETUNREACH;
}
/*
* Now build the MAC header.
*/
if (type==IPPROTO_TCP)
tmp = ip_send_room(rt, skb, raddr, len, *dev, saddr);
else
tmp = ip_send(rt, skb, raddr, len, *dev, saddr);
ip_rt_put(rt);
/*
* Book keeping
*/
skb->dev = *dev;
skb->saddr = saddr;
/*
* Now build the IP header.
*/
/*
* If we are using IPPROTO_RAW, then we don't need an IP header, since
* one is being supplied to us by the user
*/
if(type == IPPROTO_RAW)
return (tmp);
/*
* Build the IP addresses
*/
if (opt)
iph=(struct iphdr *)skb_put(skb,sizeof(struct iphdr) + opt->optlen);
else
iph=(struct iphdr *)skb_put(skb,sizeof(struct iphdr));
iph->version = 4;
iph->ihl = 5;
iph->tos = tos;
iph->frag_off = 0;
iph->ttl = ttl;
iph->daddr = daddr;
iph->saddr = saddr;
iph->protocol = type;
skb->ip_hdr = iph;
if (!opt || !opt->optlen)
return sizeof(struct iphdr) + tmp;
iph->ihl += opt->optlen>>2;
ip_options_build(skb, opt, final_daddr, (*dev)->pa_addr, 0);
return iph->ihl*4 + tmp;
}