add an optimization for dealing with raw sockets, which allows applications to filter out (among others) local tx packets on capture
SVN-Revision: 15399
This commit is contained in:
Felix Fietkau
parent
25e9d90256
commit
4898039703
2 changed files with 264 additions and 0 deletions
|
|
@ -0,0 +1,132 @@
|
|||
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_ANY 0xffffffff
|
||||
+
|
||||
|
||||
/* 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
|
||||
+ 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_ANY & ~PACKET_LOOPBACK;
|
||||
|
||||
if (sock->type == SOCK_PACKET)
|
||||
po->prot_hook.func = packet_rcv_spkt;
|
||||
@@ -1411,6 +1415,16 @@ packet_setsockopt(struct socket *sock, i
|
||||
ret = packet_mc_drop(sk, &mreq);
|
||||
return ret;
|
||||
}
|
||||
+ case PACKET_RECV_TYPE:
|
||||
+ {
|
||||
+ 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:
|
||||
@@ -1542,6 +1556,13 @@ static int packet_getsockopt(struct sock
|
||||
|
||||
data = &val;
|
||||
break;
|
||||
+ case PACKET_RECV_TYPE:
|
||||
+ if (len > sizeof(int))
|
||||
+ len = sizeof(int);
|
||||
+ val = po->pkt_type;
|
||||
+
|
||||
+ data = &val;
|
||||
+ break;
|
||||
#ifdef CONFIG_PACKET_MMAP
|
||||
case PACKET_VERSION:
|
||||
if (len > sizeof(int))
|
||||
|
|
@ -0,0 +1,132 @@
|
|||
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_ANY 0xffffffff
|
||||
+
|
||||
|
||||
/* 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
|
||||
+ 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_ANY & ~PACKET_LOOPBACK;
|
||||
|
||||
if (sock->type == SOCK_PACKET)
|
||||
po->prot_hook.func = packet_rcv_spkt;
|
||||
@@ -1411,6 +1415,16 @@ packet_setsockopt(struct socket *sock, i
|
||||
ret = packet_mc_drop(sk, &mreq);
|
||||
return ret;
|
||||
}
|
||||
+ case PACKET_RECV_TYPE:
|
||||
+ {
|
||||
+ 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:
|
||||
@@ -1542,6 +1556,13 @@ static int packet_getsockopt(struct sock
|
||||
|
||||
data = &val;
|
||||
break;
|
||||
+ case PACKET_RECV_TYPE:
|
||||
+ if (len > sizeof(int))
|
||||
+ len = sizeof(int);
|
||||
+ val = po->pkt_type;
|
||||
+
|
||||
+ data = &val;
|
||||
+ break;
|
||||
#ifdef CONFIG_PACKET_MMAP
|
||||
case PACKET_VERSION:
|
||||
if (len > sizeof(int))
|
||||
Loading…
Reference in a new issue