135 lines
3.7 KiB
Diff
135 lines
3.7 KiB
Diff
This patch allows the user to specify desired packet types (outgoing,
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broadcast, unicast, etc.) on packet sockets via setsockopt.
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This can reduce the load in situations where only a limited number
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of packet types are necessary
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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--- a/include/uapi/linux/if_packet.h
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+++ b/include/uapi/linux/if_packet.h
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@@ -31,6 +31,8 @@ struct sockaddr_ll {
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#define PACKET_KERNEL 7 /* To kernel space */
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/* Unused, PACKET_FASTROUTE and PACKET_LOOPBACK are invisible to user space */
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#define PACKET_FASTROUTE 6 /* Fastrouted frame */
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+#define PACKET_MASK_ANY 0xffffffff /* mask for packet type bits */
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+
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/* Packet socket options */
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@@ -56,6 +58,7 @@ struct sockaddr_ll {
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#define PACKET_QDISC_BYPASS 20
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#define PACKET_ROLLOVER_STATS 21
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#define PACKET_FANOUT_DATA 22
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+#define PACKET_RECV_TYPE 23
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#define PACKET_FANOUT_HASH 0
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#define PACKET_FANOUT_LB 1
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--- a/net/packet/af_packet.c
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+++ b/net/packet/af_packet.c
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@@ -1784,6 +1784,7 @@ static int packet_rcv_spkt(struct sk_buf
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{
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struct sock *sk;
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struct sockaddr_pkt *spkt;
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+ struct packet_sock *po;
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/*
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* When we registered the protocol we saved the socket in the data
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@@ -1791,6 +1792,7 @@ static int packet_rcv_spkt(struct sk_buf
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*/
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sk = pt->af_packet_priv;
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+ po = pkt_sk(sk);
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/*
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* Yank back the headers [hope the device set this
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@@ -1803,7 +1805,7 @@ static int packet_rcv_spkt(struct sk_buf
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* so that this procedure is noop.
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*/
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- if (skb->pkt_type == PACKET_LOOPBACK)
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+ if (!(po->pkt_type & (1 << skb->pkt_type)))
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goto out;
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if (!net_eq(dev_net(dev), sock_net(sk)))
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@@ -2006,12 +2008,12 @@ static int packet_rcv(struct sk_buff *sk
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int skb_len = skb->len;
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unsigned int snaplen, res;
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- if (skb->pkt_type == PACKET_LOOPBACK)
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- goto drop;
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-
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sk = pt->af_packet_priv;
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po = pkt_sk(sk);
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+ if (!(po->pkt_type & (1 << skb->pkt_type)))
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+ goto drop;
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+
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if (!net_eq(dev_net(dev), sock_net(sk)))
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goto drop;
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@@ -2131,12 +2133,12 @@ static int tpacket_rcv(struct sk_buff *s
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BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h2)) != 32);
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BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h3)) != 48);
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- if (skb->pkt_type == PACKET_LOOPBACK)
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- goto drop;
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-
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sk = pt->af_packet_priv;
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po = pkt_sk(sk);
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+ if (!(po->pkt_type & (1 << skb->pkt_type)))
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+ goto drop;
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+
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if (!net_eq(dev_net(dev), sock_net(sk)))
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goto drop;
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@@ -3155,6 +3157,7 @@ static int packet_create(struct net *net
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mutex_init(&po->pg_vec_lock);
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po->rollover = NULL;
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po->prot_hook.func = packet_rcv;
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+ po->pkt_type = PACKET_MASK_ANY & ~(1 << PACKET_LOOPBACK);
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if (sock->type == SOCK_PACKET)
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po->prot_hook.func = packet_rcv_spkt;
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@@ -3813,6 +3816,16 @@ packet_setsockopt(struct socket *sock, i
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po->xmit = val ? packet_direct_xmit : dev_queue_xmit;
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return 0;
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}
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+ case PACKET_RECV_TYPE:
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+ {
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+ unsigned int val;
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+ if (optlen != sizeof(val))
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+ return -EINVAL;
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+ if (copy_from_user(&val, optval, sizeof(val)))
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+ return -EFAULT;
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+ po->pkt_type = val & ~BIT(PACKET_LOOPBACK);
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+ return 0;
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+ }
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default:
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return -ENOPROTOOPT;
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}
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@@ -3865,6 +3878,13 @@ static int packet_getsockopt(struct sock
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case PACKET_VNET_HDR:
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val = po->has_vnet_hdr;
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break;
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+ case PACKET_RECV_TYPE:
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+ if (len > sizeof(unsigned int))
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+ len = sizeof(unsigned int);
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+ val = po->pkt_type;
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+
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+ data = &val;
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+ break;
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case PACKET_VERSION:
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val = po->tp_version;
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break;
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--- a/net/packet/internal.h
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+++ b/net/packet/internal.h
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@@ -128,6 +128,7 @@ struct packet_sock {
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struct net_device __rcu *cached_dev;
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int (*xmit)(struct sk_buff *skb);
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struct packet_type prot_hook ____cacheline_aligned_in_smp;
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+ unsigned int pkt_type;
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};
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static struct packet_sock *pkt_sk(struct sock *sk)
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