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bpf_sockops.c
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bpf_sockops.c
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#include <linux/bpf.h>
#include <linux/bpf_common.h>
#include <sys/socket.h>
#include "bpf_sockops.h"
static inline void bpf_sock_ops_ipv4(struct bpf_sock_ops *skops)
{
struct sock_key key = {};
sk_extract4_key(skops, &key);
if (key.dip4 == 16777343 || key.sip4 == 16777343 ) {
if (key.dport == 4135 || key.sport == 4135) {
int ret = sock_hash_update(skops, &sock_ops_map, &key, BPF_NOEXIST);
printk("<<< ipv4 op = %d, port %d --> %d\n", skops->op, key.sport, key.dport);
if (ret != 0)
printk("*** FAILED %d ***\n", ret);
}
}
}
static inline void bpf_sock_ops_ipv6(struct bpf_sock_ops *skops)
{
if (skops->remote_ip4)
bpf_sock_ops_ipv4(skops);
}
__section("sockops")
int bpf_sockmap(struct bpf_sock_ops *skops)
{
__u32 family, op;
family = skops->family;
op = skops->op;
//printk("<<< op %d, port = %d --> %d\n", op, skops->local_port, skops->remote_port);
switch (op) {
case BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB:
case BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB:
if (family == AF_INET6)
bpf_sock_ops_ipv6(skops);
else if (family == AF_INET)
bpf_sock_ops_ipv4(skops);
break;
default:
break;
}
return 0;
}
BPF_LICENSE("GPL");
int _version __section("version") = 1;