Re: [PATCH/RFC] openvswitch: Retain parsed IPv6 header fields in flow on error skipping extension headers
On Thu, Aug 27, 2015 at 12:10 AM, Simon Horman
simon.hor...@netronome.com wrote:
Hi Pravin,
On Mon, Aug 17, 2015 at 11:33:59AM -0700, Pravin Shelar wrote:
On Thu, Aug 13, 2015 at 6:30 PM, Simon Horman
simon.hor...@netronome.com wrote:
When an error occurs skipping IPv6 extension headers retain the already
parsed IP protocol and IPv6 addresses in the flow. Also assume that the
packet is not a fragment in the absence of information to the contrary;
...
-- 8 --
Subject: [PATCH v1.1] openvswitch: Retain parsed IPv6 header fields in flow
on error skipping extension headers
When an error occurs skipping IPv6 extension headers retain the already
parsed IP protocol and IPv6 addresses in the flow. Also assume that the
packet is not a fragment in the absence of information to the contrary;
that is always use the frag_off value set by ipv6_skip_exthdr().
This allows matching on the IP protocol and IPv6 addresses of packets
with malformed extension headers.
Signed-off-by: Simon Horman simon.hor...@netronome.com
---
* Some consideration should be given to unwanted side effects of this patch
as it affects the handling of malformed packets.
Signed-off-by: Simon Horman simon.hor...@netronome.com
---
net/openvswitch/flow.c | 21 +++--
1 file changed, 15 insertions(+), 6 deletions(-)
diff --git a/net/openvswitch/flow.c b/net/openvswitch/flow.c
index 8db22ef73626..de4366f81b11 100644
--- a/net/openvswitch/flow.c
+++ b/net/openvswitch/flow.c
@@ -271,8 +271,6 @@ static int parse_ipv6hdr(struct sk_buff *skb, struct
sw_flow_key *key)
key-ipv6.addr.dst = nh-daddr;
payload_ofs = ipv6_skip_exthdr(skb, payload_ofs, nexthdr, frag_off);
- if (unlikely(payload_ofs 0))
- return -EINVAL;
if (frag_off) {
if (frag_off htons(~0x7))
@@ -283,6 +281,13 @@ static int parse_ipv6hdr(struct sk_buff *skb, struct
sw_flow_key *key)
key-ip.frag = OVS_FRAG_TYPE_NONE;
}
+ /* Delayed handling of error in ipv6_skip_exthdr() as it
+* always sets frag_off to a valid value which may be
+* used to set key-ip.frag above.
+*/
+ if (unlikely(payload_ofs 0))
+ return -EPROTO;
+
nh_len = payload_ofs - nh_ofs;
skb_set_transport_header(skb, nh_ofs + nh_len);
key-ip.proto = nexthdr;
@@ -622,12 +627,16 @@ static int key_extract(struct sk_buff *skb, struct
sw_flow_key *key)
nh_len = parse_ipv6hdr(skb, key);
if (unlikely(nh_len 0)) {
- memset(key-ip, 0, sizeof(key-ip));
- memset(key-ipv6.addr, 0, sizeof(key-ipv6.addr));
- if (nh_len == -EINVAL) {
+ switch (nh_len) {
+ case -EINVAL:
+ memset(key-ip, 0, sizeof(key-ip));
+ memset(key-ipv6.addr, 0,
sizeof(key-ipv6.addr));
+ /* fall-through */
+ case -EPROTO:
skb-transport_header = skb-network_header;
error = 0;
- } else {
+ break;
+ default:
error = nh_len;
}
return error;
Looks good to me.
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Re: [PATCH/RFC] openvswitch: Retain parsed IPv6 header fields in flow on error skipping extension headers
On Fri, Aug 28, 2015 at 11:11:08AM -0700, Pravin Shelar wrote: [snip] Looks good to me. Thanks, I will make a formal submission of it as v2. -- To unsubscribe from this list: send the line unsubscribe netdev in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [PATCH/RFC] openvswitch: Retain parsed IPv6 header fields in flow on error skipping extension headers
Hi Pravin,
On Mon, Aug 17, 2015 at 11:33:59AM -0700, Pravin Shelar wrote:
On Thu, Aug 13, 2015 at 6:30 PM, Simon Horman
simon.hor...@netronome.com wrote:
When an error occurs skipping IPv6 extension headers retain the already
parsed IP protocol and IPv6 addresses in the flow. Also assume that the
packet is not a fragment in the absence of information to the contrary;
that is always use the frag_off value set by ipv6_skip_exthdr().
This allows matching on the IP protocol and IPv6 addresses of packets
with malformed extension headers.
Signed-off-by: Simon Horman simon.hor...@netronome.com
---
* Some consideration should be given to unwanted side effects of this patch
as it affects the handling of malformed packets.
Signed-off-by: Simon Horman simon.hor...@netronome.com
---
net/openvswitch/flow.c | 11 +++
1 file changed, 7 insertions(+), 4 deletions(-)
diff --git a/net/openvswitch/flow.c b/net/openvswitch/flow.c
index 8db22ef73626..3c5336c5d4ea 100644
--- a/net/openvswitch/flow.c
+++ b/net/openvswitch/flow.c
@@ -271,8 +271,6 @@ static int parse_ipv6hdr(struct sk_buff *skb, struct
sw_flow_key *key)
key-ipv6.addr.dst = nh-daddr;
payload_ofs = ipv6_skip_exthdr(skb, payload_ofs, nexthdr,
frag_off);
- if (unlikely(payload_ofs 0))
- return -EINVAL;
if (frag_off) {
if (frag_off htons(~0x7))
@@ -283,6 +281,13 @@ static int parse_ipv6hdr(struct sk_buff *skb, struct
sw_flow_key *key)
key-ip.frag = OVS_FRAG_TYPE_NONE;
}
+ /* Delayed handling of error in ipv6_skip_exthdr() as it
+* always sets frag_off to a valid value which may be
+* used to set key-ip.frag above.
+*/
+ if (unlikely(payload_ofs 0))
+ return -EINVAL;
+
check_header() function called above also return -EINVAL, That could
confuse caller checking for error code. So we need different error
code here.
Thanks for pointing that out and sorry for taking so long to get back to
you. How about something like this?
-- 8 --
Subject: [PATCH v1.1] openvswitch: Retain parsed IPv6 header fields in flow on
error skipping extension headers
When an error occurs skipping IPv6 extension headers retain the already
parsed IP protocol and IPv6 addresses in the flow. Also assume that the
packet is not a fragment in the absence of information to the contrary;
that is always use the frag_off value set by ipv6_skip_exthdr().
This allows matching on the IP protocol and IPv6 addresses of packets
with malformed extension headers.
Signed-off-by: Simon Horman simon.hor...@netronome.com
---
* Some consideration should be given to unwanted side effects of this patch
as it affects the handling of malformed packets.
Signed-off-by: Simon Horman simon.hor...@netronome.com
---
net/openvswitch/flow.c | 21 +++--
1 file changed, 15 insertions(+), 6 deletions(-)
diff --git a/net/openvswitch/flow.c b/net/openvswitch/flow.c
index 8db22ef73626..de4366f81b11 100644
--- a/net/openvswitch/flow.c
+++ b/net/openvswitch/flow.c
@@ -271,8 +271,6 @@ static int parse_ipv6hdr(struct sk_buff *skb, struct
sw_flow_key *key)
key-ipv6.addr.dst = nh-daddr;
payload_ofs = ipv6_skip_exthdr(skb, payload_ofs, nexthdr, frag_off);
- if (unlikely(payload_ofs 0))
- return -EINVAL;
if (frag_off) {
if (frag_off htons(~0x7))
@@ -283,6 +281,13 @@ static int parse_ipv6hdr(struct sk_buff *skb, struct
sw_flow_key *key)
key-ip.frag = OVS_FRAG_TYPE_NONE;
}
+ /* Delayed handling of error in ipv6_skip_exthdr() as it
+* always sets frag_off to a valid value which may be
+* used to set key-ip.frag above.
+*/
+ if (unlikely(payload_ofs 0))
+ return -EPROTO;
+
nh_len = payload_ofs - nh_ofs;
skb_set_transport_header(skb, nh_ofs + nh_len);
key-ip.proto = nexthdr;
@@ -622,12 +627,16 @@ static int key_extract(struct sk_buff *skb, struct
sw_flow_key *key)
nh_len = parse_ipv6hdr(skb, key);
if (unlikely(nh_len 0)) {
- memset(key-ip, 0, sizeof(key-ip));
- memset(key-ipv6.addr, 0, sizeof(key-ipv6.addr));
- if (nh_len == -EINVAL) {
+ switch (nh_len) {
+ case -EINVAL:
+ memset(key-ip, 0, sizeof(key-ip));
+ memset(key-ipv6.addr, 0,
sizeof(key-ipv6.addr));
+ /* fall-through */
+ case -EPROTO:
skb-transport_header = skb-network_header;
error = 0;
- } else {
+ break;
+ default:
error =
Re: [PATCH/RFC] openvswitch: Retain parsed IPv6 header fields in flow on error skipping extension headers
On Thu, Aug 13, 2015 at 6:30 PM, Simon Horman
simon.hor...@netronome.com wrote:
When an error occurs skipping IPv6 extension headers retain the already
parsed IP protocol and IPv6 addresses in the flow. Also assume that the
packet is not a fragment in the absence of information to the contrary;
that is always use the frag_off value set by ipv6_skip_exthdr().
This allows matching on the IP protocol and IPv6 addresses of packets
with malformed extension headers.
Signed-off-by: Simon Horman simon.hor...@netronome.com
---
* Some consideration should be given to unwanted side effects of this patch
as it affects the handling of malformed packets.
Signed-off-by: Simon Horman simon.hor...@netronome.com
---
net/openvswitch/flow.c | 11 +++
1 file changed, 7 insertions(+), 4 deletions(-)
diff --git a/net/openvswitch/flow.c b/net/openvswitch/flow.c
index 8db22ef73626..3c5336c5d4ea 100644
--- a/net/openvswitch/flow.c
+++ b/net/openvswitch/flow.c
@@ -271,8 +271,6 @@ static int parse_ipv6hdr(struct sk_buff *skb, struct
sw_flow_key *key)
key-ipv6.addr.dst = nh-daddr;
payload_ofs = ipv6_skip_exthdr(skb, payload_ofs, nexthdr, frag_off);
- if (unlikely(payload_ofs 0))
- return -EINVAL;
if (frag_off) {
if (frag_off htons(~0x7))
@@ -283,6 +281,13 @@ static int parse_ipv6hdr(struct sk_buff *skb, struct
sw_flow_key *key)
key-ip.frag = OVS_FRAG_TYPE_NONE;
}
+ /* Delayed handling of error in ipv6_skip_exthdr() as it
+* always sets frag_off to a valid value which may be
+* used to set key-ip.frag above.
+*/
+ if (unlikely(payload_ofs 0))
+ return -EINVAL;
+
check_header() function called above also return -EINVAL, That could
confuse caller checking for error code. So we need different error
code here.
--
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