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net: switch to use skb_probe_transport_header()

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Switch to use the new help skb_probe_transport_header() to do the l4 header
probing for untrusted sources. For packets with partial csum, the header should
already been set by skb_partial_csum_set().

Cc: Eric Dumazet <[email protected]>
Signed-off-by: Jason Wang <[email protected]>
Acked-by: Eric Dumazet <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Jason Wang 2013-03-26 23:11:22 +00:00 • committed by David S. Miller
commit 40893fd0fd
4 changed files with 6 additions and 45 deletions
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22
net/packet/af_packet.c
View file

@ -88,7 +88,6 @@
#include <linux/virtio_net.h>
#include <linux/errqueue.h>
#include <linux/net_tstamp.h>
#include <net/flow_keys.h>
#ifdef CONFIG_INET
#include <net/inet_common.h>
@ -1413,7 +1412,6 @@ static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock,
__be16 proto = 0;
int err;
int extra_len = 0;
struct flow_keys keys;
/*
* Get and verify the address.
@ -1514,10 +1512,7 @@ retry:
if (unlikely(extra_len == 4))
skb->no_fcs = 1;
if (skb_flow_dissect(skb, &keys))
skb_set_transport_header(skb, keys.thoff);
else
skb_reset_transport_header(skb);
skb_probe_transport_header(skb, 0);
dev_queue_xmit(skb);
rcu_read_unlock();
@ -1925,7 +1920,6 @@ static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
struct page *page;
void *data;
int err;
struct flow_keys keys;
ph.raw = frame;
@ -1950,11 +1944,7 @@ static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
skb_reserve(skb, hlen);
skb_reset_network_header(skb);
if (skb_flow_dissect(skb, &keys))
skb_set_transport_header(skb, keys.thoff);
else
skb_reset_transport_header(skb);
skb_probe_transport_header(skb, 0);
if (po->tp_tx_has_off) {
int off_min, off_max, off;
@ -2212,7 +2202,6 @@ static int packet_snd(struct socket *sock,
unsigned short gso_type = 0;
int hlen, tlen;
int extra_len = 0;
struct flow_keys keys;
/*
* Get and verify the address.
@ -2365,12 +2354,7 @@ static int packet_snd(struct socket *sock,
len += vnet_hdr_len;
}
if (skb->ip_summed == CHECKSUM_PARTIAL)
skb_set_transport_header(skb, skb_checksum_start_offset(skb));
else if (skb_flow_dissect(skb, &keys))
skb_set_transport_header(skb, keys.thoff);
else
skb_set_transport_header(skb, reserve);
skb_probe_transport_header(skb, reserve);
if (unlikely(extra_len == 4))
skb->no_fcs = 1;