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net: sched: fix skb->protocol use in case of accelerated vlan path 

tc code implicitly considers skb->protocol even in case of accelerated
vlan paths and expects vlan protocol type here. However, on rx path,
if the vlan header was already stripped, skb->protocol contains value
of next header. Similar situation is on tx path.

So for skbs that use skb->vlan_tci for tagging, use skb->vlan_proto instead.

Reported-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Pirko 2015-01-13 17:13:43 +01:00 committed by David S. Miller
parent 8bdda5ddd1
commit d8b9605d26
8 changed files with 25 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
include/net/pkt_sched.h
View File

@ -3,6 +3,7 @@
#include <linux/jiffies.h>
#include <linux/ktime.h>
#include <linux/if_vlan.h>
#include <net/sch_generic.h>
struct qdisc_walker {
@ -114,6 +115,17 @@ int tc_classify_compat(struct sk_buff *skb, const struct tcf_proto *tp,
int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp,
struct tcf_result *res);
static inline __be16 tc_skb_protocol(const struct sk_buff *skb)
{
/* We need to take extra care in case the skb came via
* vlan accelerated path. In that case, use skb->vlan_proto
* as the original vlan header was already stripped.
*/
if (vlan_tx_tag_present(skb))
return skb->vlan_proto;
return skb->protocol;
}
/* Calculate maximal size of packet seen by hard_start_xmit
routine of this device.
*/

2
net/sched/act_csum.c
View File

@ -509,7 +509,7 @@ static int tcf_csum(struct sk_buff *skb,
if (unlikely(action == TC_ACT_SHOT))
goto drop;
switch (skb->protocol) {
switch (tc_skb_protocol(skb)) {
case cpu_to_be16(ETH_P_IP):
if (!tcf_csum_ipv4(skb, update_flags))
goto drop;

8
net/sched/cls_flow.c
View File

@ -77,7 +77,7 @@ static u32 flow_get_dst(const struct sk_buff *skb, const struct flow_keys *flow)
{
if (flow->dst)
return ntohl(flow->dst);
return addr_fold(skb_dst(skb)) ^ (__force u16)skb->protocol;
return addr_fold(skb_dst(skb)) ^ (__force u16) tc_skb_protocol(skb);
}
static u32 flow_get_proto(const struct sk_buff *skb, const struct flow_keys *flow)
@ -98,7 +98,7 @@ static u32 flow_get_proto_dst(const struct sk_buff *skb, const struct flow_keys
if (flow->ports)
return ntohs(flow->port16[1]);
return addr_fold(skb_dst(skb)) ^ (__force u16)skb->protocol;
return addr_fold(skb_dst(skb)) ^ (__force u16) tc_skb_protocol(skb);
}
static u32 flow_get_iif(const struct sk_buff *skb)
@ -144,7 +144,7 @@ static u32 flow_get_nfct(const struct sk_buff *skb)
static u32 flow_get_nfct_src(const struct sk_buff *skb, const struct flow_keys *flow)
{
switch (skb->protocol) {
switch (tc_skb_protocol(skb)) {
case htons(ETH_P_IP):
return ntohl(CTTUPLE(skb, src.u3.ip));
case htons(ETH_P_IPV6):
@ -156,7 +156,7 @@ fallback:
static u32 flow_get_nfct_dst(const struct sk_buff *skb, const struct flow_keys *flow)
{
switch (skb->protocol) {
switch (tc_skb_protocol(skb)) {
case htons(ETH_P_IP):
return ntohl(CTTUPLE(skb, dst.u3.ip));
case htons(ETH_P_IPV6):

2
net/sched/em_ipset.c
View File

@ -59,7 +59,7 @@ static int em_ipset_match(struct sk_buff *skb, struct tcf_ematch *em,
struct net_device *dev, *indev = NULL;
int ret, network_offset;
switch (skb->protocol) {
switch (tc_skb_protocol(skb)) {
case htons(ETH_P_IP):
acpar.family = NFPROTO_IPV4;
if (!pskb_network_may_pull(skb, sizeof(struct iphdr)))

2
net/sched/em_meta.c
View File

@ -197,7 +197,7 @@ META_COLLECTOR(int_priority)
META_COLLECTOR(int_protocol)
{
/* Let userspace take care of the byte ordering */
dst->value = skb->protocol;
dst->value = tc_skb_protocol(skb);
}
META_COLLECTOR(int_pkttype)

2
net/sched/sch_api.c
View File

@ -1807,7 +1807,7 @@ done:
int tc_classify_compat(struct sk_buff *skb, const struct tcf_proto *tp,
struct tcf_result *res)
{
__be16 protocol = skb->protocol;
__be16 protocol = tc_skb_protocol(skb);
int err;
for (; tp; tp = rcu_dereference_bh(tp->next)) {

6
net/sched/sch_dsmark.c
View File

@ -203,7 +203,7 @@ static int dsmark_enqueue(struct sk_buff *skb, struct Qdisc *sch)
pr_debug("%s(skb %p,sch %p,[qdisc %p])\n", __func__, skb, sch, p);
if (p->set_tc_index) {
switch (skb->protocol) {
switch (tc_skb_protocol(skb)) {
case htons(ETH_P_IP):
if (skb_cow_head(skb, sizeof(struct iphdr)))
goto drop;
@ -289,7 +289,7 @@ static struct sk_buff *dsmark_dequeue(struct Qdisc *sch)
index = skb->tc_index & (p->indices - 1);
pr_debug("index %d->%d\n", skb->tc_index, index);
switch (skb->protocol) {
switch (tc_skb_protocol(skb)) {
case htons(ETH_P_IP):
ipv4_change_dsfield(ip_hdr(skb), p->mask[index],
p->value[index]);
@ -306,7 +306,7 @@ static struct sk_buff *dsmark_dequeue(struct Qdisc *sch)
*/
if (p->mask[index] != 0xff || p->value[index])
pr_warn("%s: unsupported protocol %d\n",
__func__, ntohs(skb->protocol));
__func__, ntohs(tc_skb_protocol(skb)));
break;
}

4
net/sched/sch_teql.c
View File

@ -242,8 +242,8 @@ __teql_resolve(struct sk_buff *skb, struct sk_buff *skb_res,
char haddr[MAX_ADDR_LEN];
neigh_ha_snapshot(haddr, n, dev);
err = dev_hard_header(skb, dev, ntohs(skb->protocol), haddr,
NULL, skb->len);
err = dev_hard_header(skb, dev, ntohs(tc_skb_protocol(skb)),
haddr, NULL, skb->len);
if (err < 0)
err = -EINVAL;