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packet_socket = socket(AF_PACKET, int socket_type, int protocol);
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○ htons(ETH_P_EAPOL), htons(ETH_P_IP)
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struct sockaddr_ll {
unsigned short sll_family;
unsigned short sll_protocol;
int sll_ifindex;
unsigned short sll_hatype;
unsigned char sll_pkttype;
unsigned char sll_halen;
unsigned char sll_addr[8];
};
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○ setsockopt(s, SOL_SOCKET, SO_ATTACH_FILTER, …)
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# sudo tcpdump -d arp
(000) ldh [12]
(001) jeq #0x806 jt 2 jf 3
(002) ret #262144
(003) ret #0
# sudo tcpdump -dd arp
{ 0x28, 0, 0, 0x0000000c },
{ 0x15, 0, 1, 0x00000806 },
{ 0x6, 0, 0, 0x00040000 },
{ 0x6, 0, 0, 0x00000000 },
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int nf_register_net_hook(struct net *net,
const struct nf_hook_ops *ops);
int nf_register_net_hooks(struct net *net,
const struct nf_hook_ops *reg,
unsigned int n);
int nf_register_hook(struct nf_hook_ops *reg);
int nf_register_hooks(struct nf_hook_ops *reg,
unsigned int n);
static struct nf_hook_ops ipv4_synproxy_ops[] = {
{
.hook = ipv4_synproxy_hook,
.pf = NFPROTO_IPV4,
.hooknum = NF_INET_LOCAL_IN,
.priority = NF_IP_PRI_CONNTRACK_CONFIRM - 1,
.priv = NULL,
},
{
.hook = ipv4_synproxy_hook,
.pf = NFPROTO_IPV4,
.hooknum = NF_INET_POST_ROUTING,
.priority = NF_IP_PRI_CONNTRACK_CONFIRM - 1,
.priv = NULL,
},
};
static unsigned int ipv4_synproxy_hook(void *priv,
struct sk_buff *skb,
const struct nf_hook_state *nhs)
{
do_stuff();
if (...)
return NF_ACCEPT;
do_more_stuff();
if (...)
return NF_DROP;
return NF_ACCEPT;
}
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# tc filter add dev eth0 parent 1:0 protocol ip prio 1 
u32 match ip src 4.3.2.1/32 match ip sport 80 0xffff 
flowid 1:3
# tc filter add dev eth0 parent 1:0 protocol ip prio 1 
u32 match u16 0x0000 0xffc0 at 2 flowid 1:4
# tc filter add dev eth0 parent 1:0 protocol ip prio 1 
handle 1 fw classid 1:10
# tc filter add dev eth0 parent 1: 
basic match 'meta(priority eq 6)' classid 1:10
# tc filter add dev eth0 parent 1:0 
bpf obj bpf.o sec mycls flowid 1:1
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# tc qdisc add dev eth0 ingress
# tc filter add dev eth0 parent ffff: protocol all prio 1 
u32 match u32 0 0 
action mirred egress redirect dev eth1
# tc filter add dev eth0 parent ffff: protocol ip prio 6 
u32 match ip src 10.0.0.9/32 action drop
# tc filter add dev eth0 parent ffff: pref 11 protocol ip 
u32 match ip protocol 1 0xff flowid 1:1 
u32 match ip src 10.0.0.2 flowid 1:1 
action vlan push id 123
# tc filter replace dev eth0 parent ffff: 
basic 
action bpf obj bpf.o sec my-action
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static inline void set_tcp_dest_port(struct __sk_buff *skb, __u16 new_port)
{
__u16 old_port = htons(load_half(skb, TCP_DPORT_OFF));
bpf_skb_store_bytes(skb, TCP_DPORT_OFF, &new_port, sizeof(new_port), 0);
bpf_l4_csum_replace(skb, TCP_CSUM_OFF, old_port, new_port, sizeof(new_port));
}
__attribute__((section("redirect_xmit"), used))
int _redirect_xmit(struct __sk_buff *skb)
{
__u8 proto = load_byte(skb, ETH_HLEN + offsetof(struct iphdr, protocol));
if (proto == IPPROTO_TCP)
set_tcp_dest_port(skb, 5001);
return bpf_redirect(skb->ifindex + 1, 0);
}
struct bpf_map_def __attribute__((section("maps"), used)) my_map = {
.type = BPF_MAP_TYPE_ARRAY,
.key_size = sizeof(u32),
.value_size = sizeof(long),
.max_entries = 256,
};
__attribute__((section("socket1"), used))
int bpf_prog1(struct __sk_buff *skb)
{
int index = load_byte(skb, ETH_HLEN + offsetof(struct iphdr, protocol));
long *value;
if (skb->pkt_type != PACKET_OUTGOING)
return 0;
value = bpf_map_lookup_elem(&my_map, &index);
if (value)
__sync_fetch_and_add(value, skb->len);
return 0;
}
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