/* IP input processing comes here for RAW socket delivery.
* Caller owns SKB, so we must make clones.
*
* RFC 1122: SHOULD pass TOS value up to the transport layer.
* -> It does. And not only TOS, but all IP header.
*/
void raw_v4_input(struct sk_buff *skb, struct iphdr *iph, int hash)
{
struct sock *sk;
struct hlist_head *head;
read_lock(&raw_v4_lock);
head = &raw_v4_htable[hash];
if (hlist_empty(head))
goto out;
sk = __raw_v4_lookup(__sk_head(head), iph->protocol,
iph->saddr, iph->daddr,
skb->dev->ifindex);
while (sk) {
if (iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) {
struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
/* Not releasing hash table! */
if (clone)
raw_rcv(sk, clone);
}
sk = __raw_v4_lookup(sk_next(sk), iph->protocol,
iph->saddr, iph->daddr,
skb->dev->ifindex);
}
out:
read_unlock(&raw_v4_lock);
}
static int __vcc_walk(struct sock **sock, int family, int *bucket, loff_t l)
{
struct sock *sk = *sock;
if (sk == SEQ_START_TOKEN) {
for (*bucket = 0; *bucket < VCC_HTABLE_SIZE; ++*bucket) {
struct hlist_head *head = &vcc_hash[*bucket];
sk = hlist_empty(head) ? NULL : __sk_head(head);
if (sk)
break;
}
l--;
}
try_again:
for (; sk; sk = sk_next(sk)) {
l -= compare_family(sk, family);
if (l < 0)
goto out;
}
if (!sk && ++*bucket < VCC_HTABLE_SIZE) {
sk = sk_head(&vcc_hash[*bucket]);
goto try_again;
}
sk = SEQ_START_TOKEN;
out:
*sock = sk;
return (l < 0);
}
/* IP input processing comes here for RAW socket delivery.
* Caller owns SKB, so we must make clones.
*
* RFC 1122: SHOULD pass TOS value up to the transport layer.
* -> It does. And not only TOS, but all IP header.
*/
static int raw_v4_input(struct sk_buff *skb, const struct iphdr *iph, int hash)
{
struct sock *sk;
struct hlist_head *head;
int delivered = 0;
struct net *net;
read_lock(&raw_v4_hashinfo.lock);
head = &raw_v4_hashinfo.ht[hash];
if (hlist_empty(head))
goto out;
net = dev_net(skb->dev);
sk = __raw_v4_lookup(net, __sk_head(head), iph->protocol,
iph->saddr, iph->daddr,
skb->dev->ifindex);
while (sk) {
delivered = 1;
if (iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) {
struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
/* Not releasing hash table! */
if (clone)
raw_rcv(sk, clone);
}
sk = __raw_v4_lookup(net, sk_next(sk), iph->protocol,
iph->saddr, iph->daddr,
skb->dev->ifindex);
}
out:
read_unlock(&raw_v4_hashinfo.lock);
return delivered;
}
/* IP input processing comes here for RAW socket delivery.
* Caller owns SKB, so we must make clones.
*
* RFC 1122: SHOULD pass TOS value up to the transport layer.
* -> It does. And not only TOS, but all IP header.
*/
static int raw_v4_input(struct sk_buff *skb, struct iphdr *iph, int hash)
{
struct sock *sk;
struct hlist_head *head;
int delivered = 0;
struct net *net;
read_lock(&raw_v4_hashinfo.lock);
head = &raw_v4_hashinfo.ht[hash];
if (hlist_empty(head))
goto out;
//head就是指向一个链表...该链表的结点都是protocol相同的struct sock...
//然后遍历该链表来确定是否有哪个struct sock来处理该数据包啦..
net = dev_net(skb->dev);
sk = __raw_v4_lookup(net, __sk_head(head), iph->protocol, iph->saddr, iph->daddr, skb->dev->ifindex);
while (sk) {
//来到这里代表至少说有一个struct sock可以处理该数据包....因此设置返回值为1...
delivered = 1;
if (iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) {
struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
/* Not releasing hash table! */
if (clone)
raw_rcv(sk, clone);
}
//可能存在多个struct sock同时处理一个数据包啦...主要还是看匹配规则(lookup)..
//这里看到只是匹配协议/源地址/目的地址.
sk = __raw_v4_lookup(net, sk_next(sk), iph->protocol, iph->saddr, iph->daddr, skb->dev->ifindex);
}
out:
read_unlock(&raw_v4_hashinfo.lock);
return delivered;
}
static struct sock *pep_sock_accept(struct sock *sk, int flags, int *errp)
{
struct pep_sock *pn = pep_sk(sk);
struct sock *newsk = NULL;
struct sk_buff *oskb;
int err;
lock_sock(sk);
err = pep_wait_connreq(sk, flags & O_NONBLOCK);
if (err)
goto out;
newsk = __sk_head(&pn->ackq);
oskb = skb_dequeue(&newsk->sk_receive_queue);
err = pep_accept_conn(newsk, oskb);
if (err) {
skb_queue_head(&newsk->sk_receive_queue, oskb);
newsk = NULL;
goto out;
}
kfree_skb(oskb);
sock_hold(sk);
pep_sk(newsk)->listener = sk;
sock_hold(newsk);
sk_del_node_init(newsk);
sk_acceptq_removed(sk);
sk_add_node(newsk, &pn->hlist);
__sock_put(newsk);
out:
release_sock(sk);
*errp = err;
return newsk;
}
