* [PATCH] ip6_tunnel: Correct tos value in collect_md mode
@ 2017-06-14 2:48 Haishuang Yan
2017-06-14 2:54 ` 严海双
0 siblings, 1 reply; 7+ messages in thread
From: Haishuang Yan @ 2017-06-14 2:48 UTC (permalink / raw)
To: David S. Miller, Alexey Kuznetsov, James Morris, Patrick McHardy,
Daniel Borkmann
Cc: netdev, linux-kernel, Haishuang Yan, Peter Dawson
Same as ip_gre, geneve and vxlan, use key->tos as tos value.
CC: Peter Dawson <petedaws@gmail.com>
Fixes: 0e9a709560db ("ip6_tunnel, ip6_gre: fix setting of DSCP on
encapsulated packets”)
Suggested-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Haishuang Yan <yanhaishuang@cmss.chinamobile.com>
---
Changes since v2:
* Add fixes information
* mask key->tos with RT_TOS() suggested by Daniel
---
net/ipv6/ip6_tunnel.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index ef99d59..6400726 100644
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -1249,7 +1249,7 @@ int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
fl6.flowi6_proto = IPPROTO_IPIP;
fl6.daddr = key->u.ipv6.dst;
fl6.flowlabel = key->label;
- dsfield = ip6_tclass(key->label);
+ dsfield = RT_TOS(key->tos);
} else {
if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
encap_limit = t->parms.encap_limit;
@@ -1320,7 +1320,7 @@ int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
fl6.flowi6_proto = IPPROTO_IPV6;
fl6.daddr = key->u.ipv6.dst;
fl6.flowlabel = key->label;
- dsfield = ip6_tclass(key->label);
+ dsfield = RT_TOS(key->tos);
} else {
offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
/* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
--
1.8.3.1
^ permalink raw reply related [flat|nested] 7+ messages in thread
* Re: [PATCH] ip6_tunnel: Correct tos value in collect_md mode
2017-06-14 2:48 [PATCH] ip6_tunnel: Correct tos value in collect_md mode Haishuang Yan
@ 2017-06-14 2:54 ` 严海双
2017-06-14 5:28 ` Peter Dawson
0 siblings, 1 reply; 7+ messages in thread
From: 严海双 @ 2017-06-14 2:54 UTC (permalink / raw)
To: David S. Miller, Alexey Kuznetsov, James Morris, Patrick McHardy,
Daniel Borkmann
Cc: netdev, linux-kernel, Peter Dawson
> On 14 Jun 2017, at 10:48 AM, Haishuang Yan <yanhaishuang@cmss.chinamobile.com> wrote:
>
> Same as ip_gre, geneve and vxlan, use key->tos as tos value.
>
> CC: Peter Dawson <petedaws@gmail.com>
> Fixes: 0e9a709560db ("ip6_tunnel, ip6_gre: fix setting of DSCP on
> encapsulated packets”)
> Suggested-by: Daniel Borkmann <daniel@iogearbox.net>
> Signed-off-by: Haishuang Yan <yanhaishuang@cmss.chinamobile.com>
>
> ---
> Changes since v2:
> * Add fixes information
> * mask key->tos with RT_TOS() suggested by Daniel
> ---
> net/ipv6/ip6_tunnel.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
> index ef99d59..6400726 100644
> --- a/net/ipv6/ip6_tunnel.c
> +++ b/net/ipv6/ip6_tunnel.c
> @@ -1249,7 +1249,7 @@ int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
> fl6.flowi6_proto = IPPROTO_IPIP;
> fl6.daddr = key->u.ipv6.dst;
> fl6.flowlabel = key->label;
> - dsfield = ip6_tclass(key->label);
> + dsfield = RT_TOS(key->tos);
> } else {
> if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
> encap_limit = t->parms.encap_limit;
> @@ -1320,7 +1320,7 @@ int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
> fl6.flowi6_proto = IPPROTO_IPV6;
> fl6.daddr = key->u.ipv6.dst;
> fl6.flowlabel = key->label;
> - dsfield = ip6_tclass(key->label);
> + dsfield = RT_TOS(key->tos);
> } else {
> offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
> /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
> --
> 1.8.3.1
>
>
Sorry, I forgot to add subject prefix, please ignore this patch.
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH] ip6_tunnel: Correct tos value in collect_md mode
2017-06-14 2:54 ` 严海双
@ 2017-06-14 5:28 ` Peter Dawson
2017-06-15 0:58 ` 严海双
0 siblings, 1 reply; 7+ messages in thread
From: Peter Dawson @ 2017-06-14 5:28 UTC (permalink / raw)
To: 严海双
Cc: David S. Miller, Alexey Kuznetsov, James Morris, Patrick McHardy,
Daniel Borkmann, netdev, linux-kernel
On Wed, 14 Jun 2017 10:54:31 +0800
严海双 <yanhaishuang@cmss.chinamobile.com> wrote:
> > Changes since v2:
> > * mask key->tos with RT_TOS() suggested by Daniel
Can you help me understand the rationale for this change? Is there are bug introduced by dsfield = ip6_tclass(key->label); ?
The RT_TOS masks out 4bits of the 8bit tos field in accordance with RFC1349 (obsoleted by RFC2474). IPv6 does not have a TOS field. So it dosen't make sense to apply a TOS value to the outer header of an IPv6 tunnel.
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH] ip6_tunnel: Correct tos value in collect_md mode
2017-06-14 5:28 ` Peter Dawson
@ 2017-06-15 0:58 ` 严海双
0 siblings, 0 replies; 7+ messages in thread
From: 严海双 @ 2017-06-15 0:58 UTC (permalink / raw)
To: Peter Dawson
Cc: David S. Miller, Alexey Kuznetsov, James Morris, Patrick McHardy,
Daniel Borkmann, netdev, linux-kernel
> On 14 Jun 2017, at 1:28 PM, Peter Dawson <petedaws@gmail.com> wrote:
>
> On Wed, 14 Jun 2017 10:54:31 +0800
> 严海双 <yanhaishuang@cmss.chinamobile.com> wrote:
>
>
>>> Changes since v2:
>>> * mask key->tos with RT_TOS() suggested by Daniel
>
> Can you help me understand the rationale for this change? Is there are bug introduced by dsfield = ip6_tclass(key->label); ?
>
> The RT_TOS masks out 4bits of the 8bit tos field in accordance with RFC1349 (obsoleted by RFC2474). IPv6 does not have a TOS field. So it dosen't make sense to apply a TOS value to the outer header of an IPv6 tunnel.
>
>
Hi, Peter
Here the tos also means Traffic Class in IPv6, see the define in struct ip_tunnel_key:
u8 tos; /* TOS for IPv4, TC for IPv6 */
RT_TOS mask is suggested by Daniel, please refer to the implement in vxlan or geneve code:
fl6.flowlabel = ip6_make_flowinfo(RT_TOS(tos), label);
Thanks.
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH] ip6_tunnel: Correct tos value in collect_md mode
[not found] ` <0D379591-C5AA-496C-BC00-18005EAA7D21@cmss.chinamobile.com>
@ 2017-06-13 15:37 ` Daniel Borkmann
0 siblings, 0 replies; 7+ messages in thread
From: Daniel Borkmann @ 2017-06-13 15:37 UTC (permalink / raw)
To: 严海双
Cc: David S. Miller, Alexey Kuznetsov, James Morris, Patrick McHardy,
netdev, linux-kernel, peter.a.dawson, ast
On 06/13/2017 03:31 PM, 严海双 wrote:
>> On 13 Jun 2017, at 5:57 PM, Daniel Borkmann <daniel@iogearbox.net> wrote:
>> On 06/13/2017 09:55 AM, Haishuang Yan wrote:
>>> Same as ip_gre, geneve and vxlan, use key->tos as tos value.
>>
>> Please also add Fixes tag and Cc original authors.
>>
>> Fixes: 0e9a709560db ("ip6_tunnel, ip6_gre: fix setting of DSCP on encapsulated packets”)
>
> Ok, I will add it, thanks
>
>>> Signed-off-by: Haishuang Yan <yanhaishuang@cmss.chinamobile.com>
>>> ---
>>> net/ipv6/ip6_tunnel.c | 4 ++--
>>> 1 file changed, 2 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
>>> index ef99d59..5f4aff5 100644
>>> --- a/net/ipv6/ip6_tunnel.c
>>> +++ b/net/ipv6/ip6_tunnel.c
>>> @@ -1249,7 +1249,7 @@ int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
>>> fl6.flowi6_proto = IPPROTO_IPIP;
>>> fl6.daddr = key->u.ipv6.dst;
>>> fl6.flowlabel = key->label;
>>> - dsfield = ip6_tclass(key->label);
>>> + dsfield = key->tos;
>>
>> Not exactly the same as vxlan / geneve. They do use key->tos
>> indeed, but they also set fl6.flowlabel differently:
>>
>> [...]
>> prio = info->key.tos;
>> [...]
>> fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio),
>> info->key.label);
>> [...]
>>
>> But looks like the latter is done later in ip6_tnl_xmit() eventually
>> before the route lookup as per 5f733ee68f9a ("ip6_tunnel: fix traffic
>> class routing for tunnels") fix. However, you still might want to
>> mask key->tos with RT_TOS().
>
> Do you mean this way?
This one from my last comment: dsfield = RT_TOS(key->tos)
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH] ip6_tunnel: Correct tos value in collect_md mode
2017-06-13 7:55 Haishuang Yan
@ 2017-06-13 9:57 ` Daniel Borkmann
[not found] ` <0D379591-C5AA-496C-BC00-18005EAA7D21@cmss.chinamobile.com>
0 siblings, 1 reply; 7+ messages in thread
From: Daniel Borkmann @ 2017-06-13 9:57 UTC (permalink / raw)
To: Haishuang Yan, David S. Miller, Alexey Kuznetsov, James Morris,
Patrick McHardy
Cc: netdev, linux-kernel, peter.a.dawson, ast
On 06/13/2017 09:55 AM, Haishuang Yan wrote:
> Same as ip_gre, geneve and vxlan, use key->tos as tos value.
>
Please also add Fixes tag and Cc original authors.
Fixes: 0e9a709560db ("ip6_tunnel, ip6_gre: fix setting of DSCP on encapsulated packets")
> Signed-off-by: Haishuang Yan <yanhaishuang@cmss.chinamobile.com>
> ---
> net/ipv6/ip6_tunnel.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
> index ef99d59..5f4aff5 100644
> --- a/net/ipv6/ip6_tunnel.c
> +++ b/net/ipv6/ip6_tunnel.c
> @@ -1249,7 +1249,7 @@ int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
> fl6.flowi6_proto = IPPROTO_IPIP;
> fl6.daddr = key->u.ipv6.dst;
> fl6.flowlabel = key->label;
> - dsfield = ip6_tclass(key->label);
> + dsfield = key->tos;
Not exactly the same as vxlan / geneve. They do use key->tos
indeed, but they also set fl6.flowlabel differently:
[...]
prio = info->key.tos;
[...]
fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio),
info->key.label);
[...]
But looks like the latter is done later in ip6_tnl_xmit() eventually
before the route lookup as per 5f733ee68f9a ("ip6_tunnel: fix traffic
class routing for tunnels") fix. However, you still might want to
mask key->tos with RT_TOS().
> } else {
> if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
> encap_limit = t->parms.encap_limit;
> @@ -1320,7 +1320,7 @@ int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
> fl6.flowi6_proto = IPPROTO_IPV6;
> fl6.daddr = key->u.ipv6.dst;
> fl6.flowlabel = key->label;
> - dsfield = ip6_tclass(key->label);
> + dsfield = key->tos;
> } else {
> offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
> /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
>
^ permalink raw reply [flat|nested] 7+ messages in thread
* [PATCH] ip6_tunnel: Correct tos value in collect_md mode
@ 2017-06-13 7:55 Haishuang Yan
2017-06-13 9:57 ` Daniel Borkmann
0 siblings, 1 reply; 7+ messages in thread
From: Haishuang Yan @ 2017-06-13 7:55 UTC (permalink / raw)
To: David S. Miller, Alexey Kuznetsov, James Morris, Patrick McHardy
Cc: netdev, linux-kernel, Haishuang Yan
Same as ip_gre, geneve and vxlan, use key->tos as tos value.
Signed-off-by: Haishuang Yan <yanhaishuang@cmss.chinamobile.com>
---
net/ipv6/ip6_tunnel.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index ef99d59..5f4aff5 100644
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -1249,7 +1249,7 @@ int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
fl6.flowi6_proto = IPPROTO_IPIP;
fl6.daddr = key->u.ipv6.dst;
fl6.flowlabel = key->label;
- dsfield = ip6_tclass(key->label);
+ dsfield = key->tos;
} else {
if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
encap_limit = t->parms.encap_limit;
@@ -1320,7 +1320,7 @@ int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
fl6.flowi6_proto = IPPROTO_IPV6;
fl6.daddr = key->u.ipv6.dst;
fl6.flowlabel = key->label;
- dsfield = ip6_tclass(key->label);
+ dsfield = key->tos;
} else {
offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
/* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
--
1.8.3.1
^ permalink raw reply related [flat|nested] 7+ messages in thread
end of thread, other threads:[~2017-06-15 0:58 UTC | newest]
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2017-06-14 2:48 [PATCH] ip6_tunnel: Correct tos value in collect_md mode Haishuang Yan
2017-06-14 2:54 ` 严海双
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2017-06-15 0:58 ` 严海双
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2017-06-13 7:55 Haishuang Yan
2017-06-13 9:57 ` Daniel Borkmann
[not found] ` <0D379591-C5AA-496C-BC00-18005EAA7D21@cmss.chinamobile.com>
2017-06-13 15:37 ` Daniel Borkmann
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