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Message-Id: <1439605897-28311-3-git-send-email-willemb@google.com>
Date: Fri, 14 Aug 2015 22:31:35 -0400
From: Willem de Bruijn <willemb@...gle.com>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, edumazet@...gle.com, daniel@...earbox.net,
ast@...mgrid.com, Willem de Bruijn <willemb@...gle.com>
Subject: [PATCH net-next v2 2/4] packet: add extended BPF fanout mode
From: Willem de Bruijn <willemb@...gle.com>
Add fanout mode PACKET_FANOUT_EBPF that accepts an en extended BPF
program to select a socket.
Update the internal eBPF program by passing to socket option
SOL_PACKET/PACKET_FANOUT_DATA a file descriptor returned by bpf().
Signed-off-by: Willem de Bruijn <willemb@...gle.com>
---
include/uapi/linux/if_packet.h | 1 +
net/packet/af_packet.c | 31 +++++++++++++++++++++++++++++++
2 files changed, 32 insertions(+)
diff --git a/include/uapi/linux/if_packet.h b/include/uapi/linux/if_packet.h
index a4bb16f..9e7edfd 100644
--- a/include/uapi/linux/if_packet.h
+++ b/include/uapi/linux/if_packet.h
@@ -64,6 +64,7 @@ struct sockaddr_ll {
#define PACKET_FANOUT_RND 4
#define PACKET_FANOUT_QM 5
#define PACKET_FANOUT_CBPF 6
+#define PACKET_FANOUT_EBPF 7
#define PACKET_FANOUT_FLAG_ROLLOVER 0x1000
#define PACKET_FANOUT_FLAG_DEFRAG 0x8000
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 8869d07..7b8e39a 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -1472,6 +1472,7 @@ static int packet_rcv_fanout(struct sk_buff *skb, struct net_device *dev,
idx = fanout_demux_rollover(f, skb, 0, false, num);
break;
case PACKET_FANOUT_CBPF:
+ case PACKET_FANOUT_EBPF:
idx = fanout_demux_bpf(f, skb, num);
break;
}
@@ -1529,6 +1530,7 @@ static void fanout_init_data(struct packet_fanout *f)
atomic_set(&f->rr_cur, 0);
break;
case PACKET_FANOUT_CBPF:
+ case PACKET_FANOUT_EBPF:
RCU_INIT_POINTER(f->bpf_prog, NULL);
break;
}
@@ -1571,12 +1573,39 @@ static int fanout_set_data_cbpf(struct packet_sock *po, char __user *data,
return 0;
}
+static int fanout_set_data_ebpf(struct packet_sock *po, char __user *data,
+ unsigned int len)
+{
+ struct bpf_prog *new;
+ u32 fd;
+
+ if (sock_flag(&po->sk, SOCK_FILTER_LOCKED))
+ return -EPERM;
+ if (len != sizeof(fd))
+ return -EINVAL;
+ if (copy_from_user(&fd, data, len))
+ return -EFAULT;
+
+ new = bpf_prog_get(fd);
+ if (IS_ERR(new))
+ return PTR_ERR(new);
+ if (new->type != BPF_PROG_TYPE_SOCKET_FILTER) {
+ bpf_prog_put(new);
+ return -EINVAL;
+ }
+
+ __fanout_set_data_bpf(po->fanout, new);
+ return 0;
+}
+
static int fanout_set_data(struct packet_sock *po, char __user *data,
unsigned int len)
{
switch (po->fanout->type) {
case PACKET_FANOUT_CBPF:
return fanout_set_data_cbpf(po, data, len);
+ case PACKET_FANOUT_EBPF:
+ return fanout_set_data_ebpf(po, data, len);
default:
return -EINVAL;
};
@@ -1586,6 +1615,7 @@ static void fanout_release_data(struct packet_fanout *f)
{
switch (f->type) {
case PACKET_FANOUT_CBPF:
+ case PACKET_FANOUT_EBPF:
__fanout_set_data_bpf(f, NULL);
};
}
@@ -1608,6 +1638,7 @@ static int fanout_add(struct sock *sk, u16 id, u16 type_flags)
case PACKET_FANOUT_RND:
case PACKET_FANOUT_QM:
case PACKET_FANOUT_CBPF:
+ case PACKET_FANOUT_EBPF:
break;
default:
return -EINVAL;
--
2.5.0.276.gf5e568e
--
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