You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
138 lines
3.9 KiB
138 lines
3.9 KiB
From: Felix Fietkau <nbd@nbd.name>
|
|
Subject: net: add an optimization for dealing with raw sockets
|
|
|
|
lede-commit: 4898039703d7315f0f3431c860123338ec3be0f6
|
|
Signed-off-by: Felix Fietkau <nbd@nbd.name>
|
|
---
|
|
include/uapi/linux/if_packet.h | 3 +++
|
|
net/packet/af_packet.c | 34 +++++++++++++++++++++++++++-------
|
|
net/packet/internal.h | 1 +
|
|
3 files changed, 31 insertions(+), 7 deletions(-)
|
|
|
|
--- a/include/uapi/linux/if_packet.h
|
|
+++ b/include/uapi/linux/if_packet.h
|
|
@@ -32,6 +32,8 @@ struct sockaddr_ll {
|
|
#define PACKET_KERNEL 7 /* To kernel space */
|
|
/* Unused, PACKET_FASTROUTE and PACKET_LOOPBACK are invisible to user space */
|
|
#define PACKET_FASTROUTE 6 /* Fastrouted frame */
|
|
+#define PACKET_MASK_ANY 0xffffffff /* mask for packet type bits */
|
|
+
|
|
|
|
/* Packet socket options */
|
|
|
|
@@ -57,6 +59,7 @@ struct sockaddr_ll {
|
|
#define PACKET_QDISC_BYPASS 20
|
|
#define PACKET_ROLLOVER_STATS 21
|
|
#define PACKET_FANOUT_DATA 22
|
|
+#define PACKET_RECV_TYPE 23
|
|
|
|
#define PACKET_FANOUT_HASH 0
|
|
#define PACKET_FANOUT_LB 1
|
|
--- a/net/packet/af_packet.c
|
|
+++ b/net/packet/af_packet.c
|
|
@@ -1789,6 +1789,7 @@ 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
|
|
@@ -1796,6 +1797,7 @@ 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
|
|
@@ -1808,7 +1810,7 @@ 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)))
|
|
@@ -2036,12 +2038,12 @@ static int packet_rcv(struct sk_buff *sk
|
|
unsigned int snaplen, res;
|
|
bool is_drop_n_account = false;
|
|
|
|
- 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;
|
|
|
|
@@ -2167,12 +2169,12 @@ static int tpacket_rcv(struct sk_buff *s
|
|
BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h2)) != 32);
|
|
BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h3)) != 48);
|
|
|
|
- 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;
|
|
|
|
@@ -3232,6 +3234,7 @@ static int packet_create(struct net *net
|
|
mutex_init(&po->pg_vec_lock);
|
|
po->rollover = NULL;
|
|
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;
|
|
@@ -3843,6 +3846,16 @@ packet_setsockopt(struct socket *sock, i
|
|
po->xmit = val ? packet_direct_xmit : dev_queue_xmit;
|
|
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 & ~BIT(PACKET_LOOPBACK);
|
|
+ return 0;
|
|
+ }
|
|
default:
|
|
return -ENOPROTOOPT;
|
|
}
|
|
@@ -3895,6 +3908,13 @@ static int packet_getsockopt(struct sock
|
|
case PACKET_VNET_HDR:
|
|
val = po->has_vnet_hdr;
|
|
break;
|
|
+ case PACKET_RECV_TYPE:
|
|
+ if (len > sizeof(unsigned int))
|
|
+ len = sizeof(unsigned int);
|
|
+ val = po->pkt_type;
|
|
+
|
|
+ data = &val;
|
|
+ break;
|
|
case PACKET_VERSION:
|
|
val = po->tp_version;
|
|
break;
|
|
--- a/net/packet/internal.h
|
|
+++ b/net/packet/internal.h
|
|
@@ -131,6 +131,7 @@ struct packet_sock {
|
|
struct net_device __rcu *cached_dev;
|
|
int (*xmit)(struct sk_buff *skb);
|
|
struct packet_type prot_hook ____cacheline_aligned_in_smp;
|
|
+ unsigned int pkt_type;
|
|
};
|
|
|
|
static struct packet_sock *pkt_sk(struct sock *sk)
|
|
|