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authorEric Dumazet <eric.dumazet@gmail.com>2011-11-08 10:45:04 +0000
committerDavid S. Miller <davem@davemloft.net>2011-11-08 16:41:31 -0500
commit9ecd04bc04af7df98b3a93c571e31b6ef6a90681 (patch)
tree3850ea9ffad64f46cfa20ac7b9a2c8e0f4b56517 /net/sched/sch_choke.c
parentll_temac: Add support for phy_mii_ioctl (diff)
downloadlinux-dev-9ecd04bc04af7df98b3a93c571e31b6ef6a90681.tar.xz
linux-dev-9ecd04bc04af7df98b3a93c571e31b6ef6a90681.zip
sch_choke: use skb_header_pointer()
Remove the assumption that skb_get_rxhash() makes IP header and ports linear, and use skb_header_pointer() instead in choke_match_flow() This permits __skb_get_rxhash() to use skb_header_pointer() eventually. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched/sch_choke.c')
-rw-r--r--net/sched/sch_choke.c27
1 files changed, 17 insertions, 10 deletions
diff --git a/net/sched/sch_choke.c b/net/sched/sch_choke.c
index 3422b25df9e4..061bcb744bbd 100644
--- a/net/sched/sch_choke.c
+++ b/net/sched/sch_choke.c
@@ -152,15 +152,14 @@ static bool choke_match_flow(struct sk_buff *skb1,
{
int off1, off2, poff;
const u32 *ports1, *ports2;
+ u32 _ports1, _ports2;
u8 ip_proto;
__u32 hash1;
if (skb1->protocol != skb2->protocol)
return false;
- /* Use hash value as quick check
- * Assumes that __skb_get_rxhash makes IP header and ports linear
- */
+ /* Use rxhash value as quick check */
hash1 = skb_get_rxhash(skb1);
if (!hash1 || hash1 != skb_get_rxhash(skb2))
return false;
@@ -172,10 +171,12 @@ static bool choke_match_flow(struct sk_buff *skb1,
switch (skb1->protocol) {
case __constant_htons(ETH_P_IP): {
const struct iphdr *ip1, *ip2;
+ struct iphdr _ip1, _ip2;
- ip1 = (const struct iphdr *) (skb1->data + off1);
- ip2 = (const struct iphdr *) (skb2->data + off2);
-
+ ip1 = skb_header_pointer(skb1, off1, sizeof(_ip1), &_ip1);
+ ip2 = skb_header_pointer(skb2, off2, sizeof(_ip2), &_ip2);
+ if (!ip1 || !ip2)
+ return false;
ip_proto = ip1->protocol;
if (ip_proto != ip2->protocol ||
ip1->saddr != ip2->saddr || ip1->daddr != ip2->daddr)
@@ -190,9 +191,12 @@ static bool choke_match_flow(struct sk_buff *skb1,
case __constant_htons(ETH_P_IPV6): {
const struct ipv6hdr *ip1, *ip2;
+ struct ipv6hdr _ip1, _ip2;
- ip1 = (const struct ipv6hdr *) (skb1->data + off1);
- ip2 = (const struct ipv6hdr *) (skb2->data + off2);
+ ip1 = skb_header_pointer(skb1, off1, sizeof(_ip1), &_ip1);
+ ip2 = skb_header_pointer(skb2, off2, sizeof(_ip2), &_ip2);
+ if (!ip1 || !ip2)
+ return false;
ip_proto = ip1->nexthdr;
if (ip_proto != ip2->nexthdr ||
@@ -214,8 +218,11 @@ static bool choke_match_flow(struct sk_buff *skb1,
off1 += poff;
off2 += poff;
- ports1 = (__force u32 *)(skb1->data + off1);
- ports2 = (__force u32 *)(skb2->data + off2);
+ ports1 = skb_header_pointer(skb1, off1, sizeof(_ports1), &_ports1);
+ ports2 = skb_header_pointer(skb2, off2, sizeof(_ports2), &_ports2);
+ if (!ports1 || !ports2)
+ return false;
+
return *ports1 == *ports2;
}