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133 lines
3.3 KiB
Diff
133 lines
3.3 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@openwrt.org>
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--- a/include/linux/if_packet.h
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+++ b/include/linux/if_packet.h
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@@ -31,6 +31,8 @@ struct sockaddr_ll
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/* These ones are invisible by user level */
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#define PACKET_LOOPBACK 5 /* MC/BRD frame looped back */
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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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@@ -46,6 +48,7 @@ struct sockaddr_ll
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#define PACKET_VERSION 10
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#define PACKET_HDRLEN 11
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#define PACKET_RESERVE 12
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+#define PACKET_RECV_TYPE 13
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struct tpacket_stats
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{
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--- a/net/packet/af_packet.c
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+++ b/net/packet/af_packet.c
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@@ -192,6 +192,7 @@ struct packet_sock {
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unsigned int tp_hdrlen;
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unsigned int tp_reserve;
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#endif
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+ unsigned int pkt_type;
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};
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struct packet_skb_cb {
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@@ -282,6 +283,7 @@ 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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@@ -289,6 +291,7 @@ 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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@@ -301,7 +304,7 @@ 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 (dev_net(dev) != sock_net(sk))
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@@ -486,12 +489,12 @@ 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 (dev_net(dev) != sock_net(sk))
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goto drop;
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@@ -608,12 +611,12 @@ static int tpacket_rcv(struct sk_buff *s
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struct timeval tv;
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struct timespec ts;
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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 (dev_net(dev) != sock_net(sk))
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goto drop;
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@@ -1072,6 +1075,7 @@ static int packet_create(struct net *net
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spin_lock_init(&po->bind_lock);
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mutex_init(&po->pg_vec_lock);
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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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@@ -1412,6 +1416,16 @@ packet_setsockopt(struct socket *sock, i
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ret = packet_mc_drop(sk, &mreq);
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return ret;
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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 & ~PACKET_LOOPBACK;
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+ return 0;
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+ }
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#ifdef CONFIG_PACKET_MMAP
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case PACKET_RX_RING:
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@@ -1543,6 +1557,13 @@ static int packet_getsockopt(struct sock
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data = &val;
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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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#ifdef CONFIG_PACKET_MMAP
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case PACKET_VERSION:
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if (len > sizeof(int))
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