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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
@@ -31,6 +31,8 @@ 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 */
@@ -46,6 +48,7 @@ struct sockaddr_ll
#define PACKET_VERSION 10
#define PACKET_HDRLEN 11
#define PACKET_RESERVE 12
+#define PACKET_RECV_TYPE 13
struct tpacket_stats
{
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -192,6 +192,7 @@ struct packet_sock {
unsigned int tp_hdrlen;
unsigned int tp_reserve;
#endif
+ unsigned int pkt_type;
};
struct packet_skb_cb {
@@ -282,6 +283,7 @@ 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
@@ -289,6 +291,7 @@ 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
@@ -301,7 +304,7 @@ 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 (dev_net(dev) != sock_net(sk))
@@ -486,12 +489,12 @@ 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 (dev_net(dev) != sock_net(sk))
goto drop;
@@ -608,12 +611,12 @@ static int tpacket_rcv(struct sk_buff *s
struct timeval tv;
struct timespec ts;
- 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 (dev_net(dev) != sock_net(sk))
goto drop;
@@ -1072,6 +1075,7 @@ 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;
@@ -1412,6 +1416,16 @@ packet_setsockopt(struct socket *sock, i
ret = packet_mc_drop(sk, &mreq);
return ret;
}
+ 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;
+ }
#ifdef CONFIG_PACKET_MMAP
case PACKET_RX_RING:
@@ -1543,6 +1557,13 @@ 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;
#ifdef CONFIG_PACKET_MMAP
case PACKET_VERSION:
if (len > sizeof(int))
|
