1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
<This patch allows the user to specify desired packet types (outgoing,
broadcast, unicast, etc.) on packet sockets via setsockopt.
This can reduce the load in situations where only a limited number
of packet types are necessary
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
--- a/include/linux/if_packet.h
+++ b/include/linux/if_packet.h
@@ -29,6 +29,8 @@ struct sockaddr_ll {
/* These ones are invisible by user level */
#define PACKET_LOOPBACK 5 /* MC/BRD frame looped back */
#define PACKET_FASTROUTE 6 /* Fastrouted frame */
+#define PACKET_MASK_ANY 0xffffffff /* mask for packet type bits */
+
/* Packet socket options */
@@ -49,6 +51,7 @@ struct sockaddr_ll {
#define PACKET_VNET_HDR 15
#define PACKET_TX_TIMESTAMP 16
#define PACKET_TIMESTAMP 17
+#define PACKET_RECV_TYPE 18
struct tpacket_stats {
unsigned int tp_packets;
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -210,6 +210,7 @@ struct packet_sock {
unsigned int tp_loss:1;
unsigned int tp_tstamp;
struct packet_type prot_hook ____cacheline_aligned_in_smp;
+ unsigned int pkt_type;
};
struct packet_skb_cb {
@@ -354,6 +355,7 @@ static int packet_rcv_spkt(struct sk_buf
{
struct sock *sk;
struct sockaddr_pkt *spkt;
+ struct packet_sock *po;
/*
* When we registered the protocol we saved the socket in the data
@@ -361,6 +363,7 @@ static int packet_rcv_spkt(struct sk_buf
*/
sk = pt->af_packet_priv;
+ po = pkt_sk(sk);
/*
* Yank back the headers [hope the device set this
@@ -373,7 +376,7 @@ static int packet_rcv_spkt(struct sk_buf
* so that this procedure is noop.
*/
- if (skb->pkt_type == PACKET_LOOPBACK)
+ if (!(po->pkt_type & (1 << skb->pkt_type)))
goto out;
if (!net_eq(dev_net(dev), sock_net(sk)))
@@ -566,12 +569,12 @@ static int packet_rcv(struct sk_buff *sk
int skb_len = skb->len;
unsigned int snaplen, res;
- if (skb->pkt_type == PACKET_LOOPBACK)
- goto drop;
-
sk = pt->af_packet_priv;
po = pkt_sk(sk);
+ if (!(po->pkt_type & (1 << skb->pkt_type)))
+ goto drop;
+
if (!net_eq(dev_net(dev), sock_net(sk)))
goto drop;
@@ -690,12 +693,12 @@ static int tpacket_rcv(struct sk_buff *s
struct timespec ts;
struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb);
- if (skb->pkt_type == PACKET_LOOPBACK)
- goto drop;
-
sk = pt->af_packet_priv;
po = pkt_sk(sk);
+ if (!(po->pkt_type & (1 << skb->pkt_type)))
+ goto drop;
+
if (!net_eq(dev_net(dev), sock_net(sk)))
goto drop;
@@ -1532,6 +1535,7 @@ static int packet_create(struct net *net
spin_lock_init(&po->bind_lock);
mutex_init(&po->pg_vec_lock);
po->prot_hook.func = packet_rcv;
+ po->pkt_type = PACKET_MASK_ANY & ~(1 << PACKET_LOOPBACK);
if (sock->type == SOCK_PACKET)
po->prot_hook.func = packet_rcv_spkt;
@@ -2105,6 +2109,16 @@ packet_setsockopt(struct socket *sock, i
po->tp_tstamp = val;
return 0;
}
+ case PACKET_RECV_TYPE:
+ {
+ unsigned int val;
+ if (optlen != sizeof(val))
+ return -EINVAL;
+ if (copy_from_user(&val, optval, sizeof(val)))
+ return -EFAULT;
+ po->pkt_type = val & ~PACKET_LOOPBACK;
+ return 0;
+ }
default:
return -ENOPROTOOPT;
}
@@ -2162,6 +2176,13 @@ static int packet_getsockopt(struct sock
data = &val;
break;
+ case PACKET_RECV_TYPE:
+ if (len > sizeof(unsigned int))
+ len = sizeof(unsigned int);
+ val = po->pkt_type;
+
+ data = &val;
+ break;
case PACKET_VERSION:
if (len > sizeof(int))
len = sizeof(int);
|
