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authorBen Greear <greearb@candelatech.com>2012-02-11 19:39:30 +0400
committerJeff Kirsher <jeffrey.t.kirsher@intel.com>2012-02-24 13:37:35 +0400
commit3bdc0eba0b8b47797f4a76e377dd8360f317450f (patch)
treeda6bd907f599402bc8db0a2484997fd4d3e06f7b /net/packet
parent0184039a4b6727d6efd545919c773ef141090ae7 (diff)
downloadlinux-3bdc0eba0b8b47797f4a76e377dd8360f317450f.tar.xz
net: Add framework to allow sending packets with customized CRC.
This is useful for testing RX handling of frames with bad CRCs. Requires driver support to actually put the packet on the wire properly. Signed-off-by: Ben Greear <greearb@candelatech.com> Tested-by: Aaron Brown <aaron.f.brown@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Diffstat (limited to 'net/packet')
-rw-r--r--net/packet/af_packet.c32
1 files changed, 28 insertions, 4 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 2dbb32b988c4..ae2d484416dd 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -1459,6 +1459,7 @@ static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock,
struct net_device *dev;
__be16 proto = 0;
int err;
+ int extra_len = 0;
/*
* Get and verify the address.
@@ -1493,8 +1494,16 @@ retry:
* raw protocol and you must do your own fragmentation at this level.
*/
+ if (unlikely(sock_flag(sk, SOCK_NOFCS))) {
+ if (!netif_supports_nofcs(dev)) {
+ err = -EPROTONOSUPPORT;
+ goto out_unlock;
+ }
+ extra_len = 4; /* We're doing our own CRC */
+ }
+
err = -EMSGSIZE;
- if (len > dev->mtu + dev->hard_header_len + VLAN_HLEN)
+ if (len > dev->mtu + dev->hard_header_len + VLAN_HLEN + extra_len)
goto out_unlock;
if (!skb) {
@@ -1526,7 +1535,7 @@ retry:
goto retry;
}
- if (len > (dev->mtu + dev->hard_header_len)) {
+ if (len > (dev->mtu + dev->hard_header_len + extra_len)) {
/* Earlier code assumed this would be a VLAN pkt,
* double-check this now that we have the actual
* packet in hand.
@@ -1548,6 +1557,9 @@ retry:
if (err < 0)
goto out_unlock;
+ if (unlikely(extra_len == 4))
+ skb->no_fcs = 1;
+
dev_queue_xmit(skb);
rcu_read_unlock();
return len;
@@ -2209,6 +2221,7 @@ static int packet_snd(struct socket *sock,
struct packet_sock *po = pkt_sk(sk);
unsigned short gso_type = 0;
int hlen, tlen;
+ int extra_len = 0;
/*
* Get and verify the address.
@@ -2288,8 +2301,16 @@ static int packet_snd(struct socket *sock,
}
}
+ if (unlikely(sock_flag(sk, SOCK_NOFCS))) {
+ if (!netif_supports_nofcs(dev)) {
+ err = -EPROTONOSUPPORT;
+ goto out_unlock;
+ }
+ extra_len = 4; /* We're doing our own CRC */
+ }
+
err = -EMSGSIZE;
- if (!gso_type && (len > dev->mtu + reserve + VLAN_HLEN))
+ if (!gso_type && (len > dev->mtu + reserve + VLAN_HLEN + extra_len))
goto out_unlock;
err = -ENOBUFS;
@@ -2315,7 +2336,7 @@ static int packet_snd(struct socket *sock,
if (err < 0)
goto out_free;
- if (!gso_type && (len > dev->mtu + reserve)) {
+ if (!gso_type && (len > dev->mtu + reserve + extra_len)) {
/* Earlier code assumed this would be a VLAN pkt,
* double-check this now that we have the actual
* packet in hand.
@@ -2353,6 +2374,9 @@ static int packet_snd(struct socket *sock,
len += vnet_hdr_len;
}
+ if (unlikely(extra_len == 4))
+ skb->no_fcs = 1;
+
/*
* Now send it
*/