static int br_nf_dev_queue_xmit(struct sk_buff *skb)
{
int ret;
if (skb->nfct != NULL && skb->protocol == htons(ETH_P_IP) &&
skb->len + nf_bridge_mtu_reduction(skb) > skb->dev->mtu &&
!skb_is_gso(skb)) {
if (br_parse_ip_options(skb))
/* Drop invalid packet */
return NF_DROP;
ret = ip_fragment(skb, br_dev_queue_push_xmit);
} else
ret = br_dev_queue_push_xmit(skb);
return ret;
}
static int br_nf_dev_queue_xmit(struct sk_buff *skb)
{
int ret;
if (!skb_is_gso(skb) &&
skb->protocol == htons(ETH_P_IP) &&
skb->len + nf_bridge_mtu_reduction(skb) > skb->dev->mtu) {
if (br_parse_ip_options(skb))
/* Drop invalid packet */
goto drop;
ret = ip_fragment(skb, br_dev_queue_push_xmit);
} else
ret = br_dev_queue_push_xmit(skb);
return ret;
drop:
kfree_skb(skb);
return 0;
}
int FASTPATHNET bcm_fast_path(struct sk_buff *skb)
{
if (skb->dst == NULL) {
struct iphdr *iph = ip_hdr(skb);
struct net_device *dev = skb->dev;
if (ip_route_input(skb, iph->daddr, iph->saddr, iph->tos, dev)) {
kfree_skb(skb);
return -EINVAL;
}
/* Change skb owner to output device */
skb->dev = skb->dst->dev;
}
if (unlikely(skb->len > ip_skb_dst_mtu(skb) && !skb_is_gso(skb)))
return ip_fragment(skb, bcm_fast_path_output);
return bcm_fast_path_output(skb);
}
static int br_nf_dev_queue_xmit(struct sk_buff *skb)
{
int ret;
int frag_max_size;
/* This is wrong! We should preserve the original fragment
* boundaries by preserving frag_list rather than refragmenting.
*/
if (skb->protocol == htons(ETH_P_IP) &&
skb->len + nf_bridge_mtu_reduction(skb) > skb->dev->mtu &&
!skb_is_gso(skb)) {
frag_max_size = BR_INPUT_SKB_CB(skb)->frag_max_size;
if (br_parse_ip_options(skb))
/* Drop invalid packet */
return NF_DROP;
IPCB(skb)->frag_max_size = frag_max_size;
ret = ip_fragment(skb, br_dev_queue_push_xmit);
} else
ret = br_dev_queue_push_xmit(skb);
return ret;
}
static int br_nf_dev_queue_xmit(struct sock *sk, struct sk_buff *skb)
{
int ret;
int frag_max_size;
unsigned int mtu_reserved;
if (skb_is_gso(skb) || skb->protocol != htons(ETH_P_IP))
return br_dev_queue_push_xmit(sk, skb);
mtu_reserved = nf_bridge_mtu_reduction(skb);
/* This is wrong! We should preserve the original fragment
* boundaries by preserving frag_list rather than refragmenting.
*/
if (skb->len + mtu_reserved > skb->dev->mtu) {
struct brnf_frag_data *data;
frag_max_size = BR_INPUT_SKB_CB(skb)->frag_max_size;
if (br_parse_ip_options(skb))
/* Drop invalid packet */
return NF_DROP;
IPCB(skb)->frag_max_size = frag_max_size;
nf_bridge_update_protocol(skb);
data = this_cpu_ptr(&brnf_frag_data_storage);
data->encap_size = nf_bridge_encap_header_len(skb);
data->size = ETH_HLEN + data->encap_size;
skb_copy_from_linear_data_offset(skb, -data->size, data->mac,
data->size);
ret = ip_fragment(sk, skb, br_nf_push_frag_xmit);
} else {
ret = br_dev_queue_push_xmit(sk, skb);
}
return ret;
}
static unsigned int ip_refrag(unsigned int hooknum,
struct sk_buff **pskb,
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
struct rtable *rt = (struct rtable *)(*pskb)->dst;
/* We've seen it coming out the other side: confirm */
if (ip_confirm(hooknum, pskb, in, out, okfn) != NF_ACCEPT)
return NF_DROP;
/* Local packets are never produced too large for their
interface. We degfragment them at LOCAL_OUT, however,
so we have to refragment them here. */
if ((*pskb)->len > dst_pmtu(&rt->u.dst) &&
!skb_shinfo(*pskb)->tso_size) {
/* No hook can be after us, so this should be OK. */
ip_fragment(*pskb, okfn);
return NF_STOLEN;
}
return NF_ACCEPT;
}
static inline int bcm_fast_path(struct sk_buff *skb)
{
if (skb_dst(skb) == NULL) {
struct iphdr *iph = ip_hdr(skb);
struct net_device *dev = skb->dev;
if (ip_route_input(skb, iph->daddr, iph->saddr, iph->tos, dev)) {
return NF_DROP;
}
/* Change skb owner to output device */
skb->dev = skb_dst(skb)->dev;
}
if (skb_dst(skb)) {
if (skb->len > ip_skb_dst_mtu(skb) && !skb_is_gso(skb))
return ip_fragment(skb, bcm_fast_path_output);
else
return bcm_fast_path_output(skb);
}
kfree_skb(skb);
return -EINVAL;
}
void ip_queue_xmit(struct sock *sk, struct device *dev,
struct sk_buff *skb, int free)
{
unsigned int tot_len;
struct iphdr *iph;
IS_SKB(skb);
/*
* Do some book-keeping in the packet for later
*/
skb->sk = sk;
skb->dev = dev;
skb->when = jiffies;
/*
* Find the IP header and set the length. This is bad
* but once we get the skb data handling code in the
* hardware will push its header sensibly and we will
* set skb->ip_hdr to avoid this mess and the fixed
* header length problem
*/
iph = skb->ip_hdr;
tot_len = skb->len - (((unsigned char *)iph) - skb->data);
iph->tot_len = htons(tot_len);
switch (free) {
/* No reassigning numbers to fragments... */
default:
free = 1;
break;
case 0:
add_to_send_queue(sk, skb);
/* fall through */
case 1:
iph->id = htons(ip_id_count++);
}
skb->free = free;
/* Sanity check */
if (dev == NULL)
goto no_device;
#ifdef CONFIG_FIREWALL
if (call_out_firewall(PF_INET, skb->dev, iph, NULL) < FW_ACCEPT)
goto out;
#endif
/*
* Do we need to fragment. Again this is inefficient.
* We need to somehow lock the original buffer and use
* bits of it.
*/
if (tot_len > dev->mtu)
goto fragment;
/*
* Add an IP checksum
*/
ip_send_check(iph);
/*
* More debugging. You cannot queue a packet already on a list
* Spot this and moan loudly.
*/
if (skb->next != NULL)
{
NETDEBUG(printk("ip_queue_xmit: next != NULL\n"));
skb_unlink(skb);
}
/*
* If the indicated interface is up and running, send the packet.
*/
ip_statistics.IpOutRequests++;
#ifdef CONFIG_IP_ACCT
ip_fw_chk(iph,dev,NULL,ip_acct_chain,0,IP_FW_MODE_ACCT_OUT);
#endif
#ifdef CONFIG_IP_MULTICAST
/*
* Multicasts are looped back for other local users
*/
if (MULTICAST(iph->daddr) && !(dev->flags&IFF_LOOPBACK))
{
if(sk==NULL || sk->ip_mc_loop)
{
if(iph->daddr==IGMP_ALL_HOSTS || (dev->flags&IFF_ALLMULTI))
{
ip_loopback(dev,skb);
}
else
{
struct ip_mc_list *imc=dev->ip_mc_list;
while(imc!=NULL)
{
if(imc->multiaddr==iph->daddr)
{
ip_loopback(dev,skb);
break;
}
imc=imc->next;
}
}
}
/* Multicasts with ttl 0 must not go beyond the host */
if (iph->ttl==0)
goto out;
}
#endif
if ((dev->flags & IFF_BROADCAST) && !(dev->flags & IFF_LOOPBACK)
&& (iph->daddr==dev->pa_brdaddr || iph->daddr==0xFFFFFFFF))
ip_loopback(dev,skb);
if (dev->flags & IFF_UP)
{
/*
* If we have an owner use its priority setting,
* otherwise use NORMAL
*/
int priority = SOPRI_NORMAL;
if (sk)
priority = sk->priority;
dev_queue_xmit(skb, dev, priority);
return;
}
if(sk)
sk->err = ENETDOWN;
ip_statistics.IpOutDiscards++;
out:
if (free)
kfree_skb(skb, FREE_WRITE);
return;
no_device:
NETDEBUG(printk("IP: ip_queue_xmit dev = NULL\n"));
goto out;
fragment:
ip_fragment(sk,skb,dev,0);
goto out;
}