xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

ila: Perform only one translation in forwarding path

Browse Source 
When setting up ILA in a router we noticed that the the encapsulation
is invoked twice: once in the route input path and again upon route
output. To resolve this we add a flag set_csum_neutral for the
ila_update_ipv6_locator. If this flag is set and the checksum
neutral bit is also set we assume that checksum-neutral translation
has already been performed and take no further action. The
flag is set only in ila_output path. The flag is not set for ila_input and
ila_xlat.

Tested:

Used 3 netns to set to emulate a router and two hosts. The router
translates SIR addresses between the two destinations in other two netns.
Verified ping and netperf are functional.

Signed-off-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Herbert
2016-06-07 16:09:44 -07:00
committed by David S. Miller
parent e00431bc93
commit 707a2ca487
4 changed files with 12 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
net/ipv6/ila/ila_common.c
View File

@@ -103,7 +103,8 @@ static void ila_csum_adjust_transport(struct sk_buff *skb,
iaddr->loc = p->locator;
}
void ila_update_ipv6_locator(struct sk_buff *skb, struct ila_params *p)
void ila_update_ipv6_locator(struct sk_buff *skb, struct ila_params *p,
bool set_csum_neutral)
{
struct ipv6hdr *ip6h = ipv6_hdr(skb);
struct ila_addr *iaddr = ila_a2i(&ip6h->daddr);
@@ -114,7 +115,8 @@ void ila_update_ipv6_locator(struct sk_buff *skb, struct ila_params *p)
* is a locator being translated to a SIR address.
* Perform (receiver) checksum-neutral translation.
*/
ila_csum_do_neutral(iaddr, p);
if (!set_csum_neutral)
ila_csum_do_neutral(iaddr, p);
} else {
switch (p->csum_mode) {
case ILA_CSUM_ADJUST_TRANSPORT: