This patch mitigates the two-reallocations issue with seg6_iptunnel by
providing the dst_entry (in the cache) to the first call to
skb_cow_head(). As a result, the very first iteration would still
trigger two reallocations (i.e., empty cache), while next iterations
would only trigger a single reallocation.
Performance tests before/after applying this patch, which clearly shows
the improvement:
- before: https://ibb.co/3Cg4sNH
- after: https://ibb.co/8rQ350r
Signed-off-by: Justin Iurman <justin.iurman@uliege.be>
---
net/ipv6/seg6_iptunnel.c | 103 ++++++++++++++++++++++-----------------
1 file changed, 58 insertions(+), 45 deletions(-)
diff --git a/net/ipv6/seg6_iptunnel.c b/net/ipv6/seg6_iptunnel.c
index 098632adc9b5..7789a31db355 100644
--- a/net/ipv6/seg6_iptunnel.c
+++ b/net/ipv6/seg6_iptunnel.c
@@ -127,8 +127,14 @@ static __be32 seg6_make_flowlabel(struct net *net, struct sk_buff *skb,
/* encapsulate an IPv6 packet within an outer IPv6 header with a given SRH */
int seg6_do_srh_encap(struct sk_buff *skb, struct ipv6_sr_hdr *osrh, int proto)
{
- struct dst_entry *dst = skb_dst(skb);
- struct net *net = dev_net(dst->dev);
+ return __seg6_do_srh_encap(skb, osrh, proto, NULL);
+}
+EXPORT_SYMBOL_GPL(seg6_do_srh_encap);
+
+int __seg6_do_srh_encap(struct sk_buff *skb, struct ipv6_sr_hdr *osrh,
+ int proto, struct dst_entry *dst)
+{
+ struct net *net = dev_net(skb_dst(skb)->dev);
struct ipv6hdr *hdr, *inner_hdr;
struct ipv6_sr_hdr *isrh;
int hdrlen, tot_len, err;
@@ -137,7 +143,8 @@ int seg6_do_srh_encap(struct sk_buff *skb, struct ipv6_sr_hdr *osrh, int proto)
hdrlen = (osrh->hdrlen + 1) << 3;
tot_len = hdrlen + sizeof(*hdr);
- err = skb_cow_head(skb, tot_len + skb->mac_len);
+ err = skb_cow_head(skb, tot_len + (!dst ? skb->mac_len
+ : LL_RESERVED_SPACE(dst->dev)));
if (unlikely(err))
return err;
@@ -181,7 +188,7 @@ int seg6_do_srh_encap(struct sk_buff *skb, struct ipv6_sr_hdr *osrh, int proto)
isrh->nexthdr = proto;
hdr->daddr = isrh->segments[isrh->first_segment];
- set_tun_src(net, dst->dev, &hdr->daddr, &hdr->saddr);
+ set_tun_src(net, skb_dst(skb)->dev, &hdr->daddr, &hdr->saddr);
#ifdef CONFIG_IPV6_SEG6_HMAC
if (sr_has_hmac(isrh)) {
@@ -197,15 +204,14 @@ int seg6_do_srh_encap(struct sk_buff *skb, struct ipv6_sr_hdr *osrh, int proto)
return 0;
}
-EXPORT_SYMBOL_GPL(seg6_do_srh_encap);
/* encapsulate an IPv6 packet within an outer IPv6 header with reduced SRH */
static int seg6_do_srh_encap_red(struct sk_buff *skb,
- struct ipv6_sr_hdr *osrh, int proto)
+ struct ipv6_sr_hdr *osrh, int proto,
+ struct dst_entry *dst)
{
__u8 first_seg = osrh->first_segment;
- struct dst_entry *dst = skb_dst(skb);
- struct net *net = dev_net(dst->dev);
+ struct net *net = dev_net(skb_dst(skb)->dev);
struct ipv6hdr *hdr, *inner_hdr;
int hdrlen = ipv6_optlen(osrh);
int red_tlv_offset, tlv_offset;
@@ -230,7 +236,8 @@ static int seg6_do_srh_encap_red(struct sk_buff *skb,
tot_len = red_hdrlen + sizeof(struct ipv6hdr);
- err = skb_cow_head(skb, tot_len + skb->mac_len);
+ err = skb_cow_head(skb, tot_len + (!dst ? skb->mac_len
+ : LL_RESERVED_SPACE(dst->dev)));
if (unlikely(err))
return err;
@@ -263,7 +270,7 @@ static int seg6_do_srh_encap_red(struct sk_buff *skb,
if (skip_srh) {
hdr->nexthdr = proto;
- set_tun_src(net, dst->dev, &hdr->daddr, &hdr->saddr);
+ set_tun_src(net, skb_dst(skb)->dev, &hdr->daddr, &hdr->saddr);
goto out;
}
@@ -299,7 +306,7 @@ static int seg6_do_srh_encap_red(struct sk_buff *skb,
srcaddr:
isrh->nexthdr = proto;
- set_tun_src(net, dst->dev, &hdr->daddr, &hdr->saddr);
+ set_tun_src(net, skb_dst(skb)->dev, &hdr->daddr, &hdr->saddr);
#ifdef CONFIG_IPV6_SEG6_HMAC
if (unlikely(!skip_srh && sr_has_hmac(isrh))) {
@@ -319,6 +326,13 @@ static int seg6_do_srh_encap_red(struct sk_buff *skb,
/* insert an SRH within an IPv6 packet, just after the IPv6 header */
int seg6_do_srh_inline(struct sk_buff *skb, struct ipv6_sr_hdr *osrh)
+{
+ return __seg6_do_srh_inline(skb, osrh, NULL);
+}
+EXPORT_SYMBOL_GPL(seg6_do_srh_inline);
+
+int __seg6_do_srh_inline(struct sk_buff *skb, struct ipv6_sr_hdr *osrh,
+ struct dst_entry *dst)
{
struct ipv6hdr *hdr, *oldhdr;
struct ipv6_sr_hdr *isrh;
@@ -326,7 +340,8 @@ int seg6_do_srh_inline(struct sk_buff *skb, struct ipv6_sr_hdr *osrh)
hdrlen = (osrh->hdrlen + 1) << 3;
- err = skb_cow_head(skb, hdrlen + skb->mac_len);
+ err = skb_cow_head(skb, hdrlen + (!dst ? skb->mac_len
+ : LL_RESERVED_SPACE(dst->dev)));
if (unlikely(err))
return err;
@@ -369,22 +384,20 @@ int seg6_do_srh_inline(struct sk_buff *skb, struct ipv6_sr_hdr *osrh)
return 0;
}
-EXPORT_SYMBOL_GPL(seg6_do_srh_inline);
-static int seg6_do_srh(struct sk_buff *skb)
+static int seg6_do_srh(struct sk_buff *skb, struct dst_entry *dst)
{
- struct dst_entry *dst = skb_dst(skb);
struct seg6_iptunnel_encap *tinfo;
int proto, err = 0;
- tinfo = seg6_encap_lwtunnel(dst->lwtstate);
+ tinfo = seg6_encap_lwtunnel(skb_dst(skb)->lwtstate);
switch (tinfo->mode) {
case SEG6_IPTUN_MODE_INLINE:
if (skb->protocol != htons(ETH_P_IPV6))
return -EINVAL;
- err = seg6_do_srh_inline(skb, tinfo->srh);
+ err = __seg6_do_srh_inline(skb, tinfo->srh, dst);
if (err)
return err;
break;
@@ -402,9 +415,9 @@ static int seg6_do_srh(struct sk_buff *skb)
return -EINVAL;
if (tinfo->mode == SEG6_IPTUN_MODE_ENCAP)
- err = seg6_do_srh_encap(skb, tinfo->srh, proto);
+ err = __seg6_do_srh_encap(skb, tinfo->srh, proto, dst);
else
- err = seg6_do_srh_encap_red(skb, tinfo->srh, proto);
+ err = seg6_do_srh_encap_red(skb, tinfo->srh, proto, dst);
if (err)
return err;
@@ -425,11 +438,11 @@ static int seg6_do_srh(struct sk_buff *skb)
skb_push(skb, skb->mac_len);
if (tinfo->mode == SEG6_IPTUN_MODE_L2ENCAP)
- err = seg6_do_srh_encap(skb, tinfo->srh,
- IPPROTO_ETHERNET);
+ err = __seg6_do_srh_encap(skb, tinfo->srh,
+ IPPROTO_ETHERNET, dst);
else
err = seg6_do_srh_encap_red(skb, tinfo->srh,
- IPPROTO_ETHERNET);
+ IPPROTO_ETHERNET, dst);
if (err)
return err;
@@ -453,36 +466,37 @@ static int seg6_input_finish(struct net *net, struct sock *sk,
static int seg6_input_core(struct net *net, struct sock *sk,
struct sk_buff *skb)
{
- struct dst_entry *orig_dst = skb_dst(skb);
- struct dst_entry *dst = NULL;
+ struct dst_entry *dst;
struct seg6_lwt *slwt;
int err;
- err = seg6_do_srh(skb);
- if (unlikely(err))
- goto drop;
-
- slwt = seg6_lwt_lwtunnel(orig_dst->lwtstate);
+ slwt = seg6_lwt_lwtunnel(skb_dst(skb)->lwtstate);
local_bh_disable();
dst = dst_cache_get(&slwt->cache);
+ local_bh_enable();
+
+ err = seg6_do_srh(skb, dst);
+ if (unlikely(err))
+ goto drop;
if (!dst) {
ip6_route_input(skb);
dst = skb_dst(skb);
if (!dst->error) {
+ local_bh_disable();
dst_cache_set_ip6(&slwt->cache, dst,
&ipv6_hdr(skb)->saddr);
+ local_bh_enable();
}
+
+ err = skb_cow_head(skb, LL_RESERVED_SPACE(dst->dev));
+ if (unlikely(err))
+ goto drop;
} else {
skb_dst_drop(skb);
skb_dst_set(skb, dst);
}
- local_bh_enable();
-
- err = skb_cow_head(skb, LL_RESERVED_SPACE(dst->dev));
- if (unlikely(err))
- goto drop;
if (static_branch_unlikely(&nf_hooks_lwtunnel_enabled))
return NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
@@ -523,21 +537,20 @@ static int seg6_input(struct sk_buff *skb)
static int seg6_output_core(struct net *net, struct sock *sk,
struct sk_buff *skb)
{
- struct dst_entry *orig_dst = skb_dst(skb);
- struct dst_entry *dst = NULL;
+ struct dst_entry *dst;
struct seg6_lwt *slwt;
int err;
- err = seg6_do_srh(skb);
- if (unlikely(err))
- goto drop;
-
- slwt = seg6_lwt_lwtunnel(orig_dst->lwtstate);
+ slwt = seg6_lwt_lwtunnel(skb_dst(skb)->lwtstate);
local_bh_disable();
dst = dst_cache_get(&slwt->cache);
local_bh_enable();
+ err = seg6_do_srh(skb, dst);
+ if (unlikely(err))
+ goto drop;
+
if (unlikely(!dst)) {
struct ipv6hdr *hdr = ipv6_hdr(skb);
struct flowi6 fl6;
@@ -559,15 +572,15 @@ static int seg6_output_core(struct net *net, struct sock *sk,
local_bh_disable();
dst_cache_set_ip6(&slwt->cache, dst, &fl6.saddr);
local_bh_enable();
+
+ err = skb_cow_head(skb, LL_RESERVED_SPACE(dst->dev));
+ if (unlikely(err))
+ goto drop;
}
skb_dst_drop(skb);
skb_dst_set(skb, dst);
- err = skb_cow_head(skb, LL_RESERVED_SPACE(dst->dev));
- if (unlikely(err))
- goto drop;
-
if (static_branch_unlikely(&nf_hooks_lwtunnel_enabled))
return NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk, skb,
NULL, skb_dst(skb)->dev, dst_output);
--
2.34.1Hi Justin,
kernel test robot noticed the following build errors:
[auto build test ERROR on net-next/main]
url: https://github.com/intel-lab-lkp/linux/commits/Justin-Iurman/net-ipv6-ioam6_iptunnel-mitigate-2-realloc-issue/20241025-214849
base: net-next/main
patch link: https://lore.kernel.org/r/20241025133727.27742-3-justin.iurman%40uliege.be
patch subject: [PATCH net-next 2/3] net: ipv6: seg6_iptunnel: mitigate 2-realloc issue
config: i386-buildonly-randconfig-004-20241026 (https://download.01.org/0day-ci/archive/20241026/202410261713.GIaQEsJC-lkp@intel.com/config)
compiler: clang version 19.1.2 (https://github.com/llvm/llvm-project 7ba7d8e2f7b6445b60679da826210cdde29eaf8b)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241026/202410261713.GIaQEsJC-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202410261713.GIaQEsJC-lkp@intel.com/
All error/warnings (new ones prefixed by >>):
In file included from net/ipv6/seg6_iptunnel.c:10:
In file included from include/linux/skbuff.h:17:
In file included from include/linux/bvec.h:10:
In file included from include/linux/highmem.h:8:
In file included from include/linux/cacheflush.h:5:
In file included from arch/x86/include/asm/cacheflush.h:5:
In file included from include/linux/mm.h:2213:
include/linux/vmstat.h:518:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
518 | return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
| ~~~~~~~~~~~ ^ ~~~
>> net/ipv6/seg6_iptunnel.c:130:9: error: call to undeclared function '__seg6_do_srh_encap'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
130 | return __seg6_do_srh_encap(skb, osrh, proto, NULL);
| ^
net/ipv6/seg6_iptunnel.c:130:9: note: did you mean 'seg6_do_srh_encap'?
net/ipv6/seg6_iptunnel.c:128:5: note: 'seg6_do_srh_encap' declared here
128 | int seg6_do_srh_encap(struct sk_buff *skb, struct ipv6_sr_hdr *osrh, int proto)
| ^
129 | {
130 | return __seg6_do_srh_encap(skb, osrh, proto, NULL);
| ~~~~~~~~~~~~~~~~~~~
| seg6_do_srh_encap
>> net/ipv6/seg6_iptunnel.c:134:5: warning: no previous prototype for function '__seg6_do_srh_encap' [-Wmissing-prototypes]
134 | int __seg6_do_srh_encap(struct sk_buff *skb, struct ipv6_sr_hdr *osrh,
| ^
net/ipv6/seg6_iptunnel.c:134:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
134 | int __seg6_do_srh_encap(struct sk_buff *skb, struct ipv6_sr_hdr *osrh,
| ^
| static
>> net/ipv6/seg6_iptunnel.c:330:9: error: call to undeclared function '__seg6_do_srh_inline'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
330 | return __seg6_do_srh_inline(skb, osrh, NULL);
| ^
net/ipv6/seg6_iptunnel.c:330:9: note: did you mean 'seg6_do_srh_inline'?
net/ipv6/seg6_iptunnel.c:328:5: note: 'seg6_do_srh_inline' declared here
328 | int seg6_do_srh_inline(struct sk_buff *skb, struct ipv6_sr_hdr *osrh)
| ^
329 | {
330 | return __seg6_do_srh_inline(skb, osrh, NULL);
| ~~~~~~~~~~~~~~~~~~~~
| seg6_do_srh_inline
>> net/ipv6/seg6_iptunnel.c:334:5: warning: no previous prototype for function '__seg6_do_srh_inline' [-Wmissing-prototypes]
334 | int __seg6_do_srh_inline(struct sk_buff *skb, struct ipv6_sr_hdr *osrh,
| ^
net/ipv6/seg6_iptunnel.c:334:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
334 | int __seg6_do_srh_inline(struct sk_buff *skb, struct ipv6_sr_hdr *osrh,
| ^
| static
3 warnings and 2 errors generated.
vim +/__seg6_do_srh_encap +130 net/ipv6/seg6_iptunnel.c
126
127 /* encapsulate an IPv6 packet within an outer IPv6 header with a given SRH */
128 int seg6_do_srh_encap(struct sk_buff *skb, struct ipv6_sr_hdr *osrh, int proto)
129 {
> 130 return __seg6_do_srh_encap(skb, osrh, proto, NULL);
131 }
132 EXPORT_SYMBOL_GPL(seg6_do_srh_encap);
133
> 134 int __seg6_do_srh_encap(struct sk_buff *skb, struct ipv6_sr_hdr *osrh,
135 int proto, struct dst_entry *dst)
136 {
137 struct net *net = dev_net(skb_dst(skb)->dev);
138 struct ipv6hdr *hdr, *inner_hdr;
139 struct ipv6_sr_hdr *isrh;
140 int hdrlen, tot_len, err;
141 __be32 flowlabel;
142
143 hdrlen = (osrh->hdrlen + 1) << 3;
144 tot_len = hdrlen + sizeof(*hdr);
145
146 err = skb_cow_head(skb, tot_len + (!dst ? skb->mac_len
147 : LL_RESERVED_SPACE(dst->dev)));
148 if (unlikely(err))
149 return err;
150
151 inner_hdr = ipv6_hdr(skb);
152 flowlabel = seg6_make_flowlabel(net, skb, inner_hdr);
153
154 skb_push(skb, tot_len);
155 skb_reset_network_header(skb);
156 skb_mac_header_rebuild(skb);
157 hdr = ipv6_hdr(skb);
158
159 /* inherit tc, flowlabel and hlim
160 * hlim will be decremented in ip6_forward() afterwards and
161 * decapsulation will overwrite inner hlim with outer hlim
162 */
163
164 if (skb->protocol == htons(ETH_P_IPV6)) {
165 ip6_flow_hdr(hdr, ip6_tclass(ip6_flowinfo(inner_hdr)),
166 flowlabel);
167 hdr->hop_limit = inner_hdr->hop_limit;
168 } else {
169 ip6_flow_hdr(hdr, 0, flowlabel);
170 hdr->hop_limit = ip6_dst_hoplimit(skb_dst(skb));
171
172 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
173
174 /* the control block has been erased, so we have to set the
175 * iif once again.
176 * We read the receiving interface index directly from the
177 * skb->skb_iif as it is done in the IPv4 receiving path (i.e.:
178 * ip_rcv_core(...)).
179 */
180 IP6CB(skb)->iif = skb->skb_iif;
181 }
182
183 hdr->nexthdr = NEXTHDR_ROUTING;
184
185 isrh = (void *)hdr + sizeof(*hdr);
186 memcpy(isrh, osrh, hdrlen);
187
188 isrh->nexthdr = proto;
189
190 hdr->daddr = isrh->segments[isrh->first_segment];
191 set_tun_src(net, skb_dst(skb)->dev, &hdr->daddr, &hdr->saddr);
192
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
Hi Justin,
kernel test robot noticed the following build errors:
[auto build test ERROR on net-next/main]
url: https://github.com/intel-lab-lkp/linux/commits/Justin-Iurman/net-ipv6-ioam6_iptunnel-mitigate-2-realloc-issue/20241025-214849
base: net-next/main
patch link: https://lore.kernel.org/r/20241025133727.27742-3-justin.iurman%40uliege.be
patch subject: [PATCH net-next 2/3] net: ipv6: seg6_iptunnel: mitigate 2-realloc issue
config: arc-randconfig-001-20241026 (https://download.01.org/0day-ci/archive/20241026/202410261651.MiKpheOT-lkp@intel.com/config)
compiler: arc-elf-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241026/202410261651.MiKpheOT-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202410261651.MiKpheOT-lkp@intel.com/
All error/warnings (new ones prefixed by >>):
net/ipv6/seg6_iptunnel.c: In function 'seg6_do_srh_encap':
>> net/ipv6/seg6_iptunnel.c:130:16: error: implicit declaration of function '__seg6_do_srh_encap'; did you mean 'seg6_do_srh_encap'? [-Werror=implicit-function-declaration]
130 | return __seg6_do_srh_encap(skb, osrh, proto, NULL);
| ^~~~~~~~~~~~~~~~~~~
| seg6_do_srh_encap
net/ipv6/seg6_iptunnel.c: At top level:
>> net/ipv6/seg6_iptunnel.c:134:5: warning: no previous prototype for '__seg6_do_srh_encap' [-Wmissing-prototypes]
134 | int __seg6_do_srh_encap(struct sk_buff *skb, struct ipv6_sr_hdr *osrh,
| ^~~~~~~~~~~~~~~~~~~
net/ipv6/seg6_iptunnel.c: In function 'seg6_do_srh_inline':
>> net/ipv6/seg6_iptunnel.c:330:16: error: implicit declaration of function '__seg6_do_srh_inline'; did you mean 'seg6_do_srh_inline'? [-Werror=implicit-function-declaration]
330 | return __seg6_do_srh_inline(skb, osrh, NULL);
| ^~~~~~~~~~~~~~~~~~~~
| seg6_do_srh_inline
net/ipv6/seg6_iptunnel.c: At top level:
>> net/ipv6/seg6_iptunnel.c:334:5: warning: no previous prototype for '__seg6_do_srh_inline' [-Wmissing-prototypes]
334 | int __seg6_do_srh_inline(struct sk_buff *skb, struct ipv6_sr_hdr *osrh,
| ^~~~~~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors
vim +130 net/ipv6/seg6_iptunnel.c
126
127 /* encapsulate an IPv6 packet within an outer IPv6 header with a given SRH */
128 int seg6_do_srh_encap(struct sk_buff *skb, struct ipv6_sr_hdr *osrh, int proto)
129 {
> 130 return __seg6_do_srh_encap(skb, osrh, proto, NULL);
131 }
132 EXPORT_SYMBOL_GPL(seg6_do_srh_encap);
133
> 134 int __seg6_do_srh_encap(struct sk_buff *skb, struct ipv6_sr_hdr *osrh,
135 int proto, struct dst_entry *dst)
136 {
137 struct net *net = dev_net(skb_dst(skb)->dev);
138 struct ipv6hdr *hdr, *inner_hdr;
139 struct ipv6_sr_hdr *isrh;
140 int hdrlen, tot_len, err;
141 __be32 flowlabel;
142
143 hdrlen = (osrh->hdrlen + 1) << 3;
144 tot_len = hdrlen + sizeof(*hdr);
145
146 err = skb_cow_head(skb, tot_len + (!dst ? skb->mac_len
147 : LL_RESERVED_SPACE(dst->dev)));
148 if (unlikely(err))
149 return err;
150
151 inner_hdr = ipv6_hdr(skb);
152 flowlabel = seg6_make_flowlabel(net, skb, inner_hdr);
153
154 skb_push(skb, tot_len);
155 skb_reset_network_header(skb);
156 skb_mac_header_rebuild(skb);
157 hdr = ipv6_hdr(skb);
158
159 /* inherit tc, flowlabel and hlim
160 * hlim will be decremented in ip6_forward() afterwards and
161 * decapsulation will overwrite inner hlim with outer hlim
162 */
163
164 if (skb->protocol == htons(ETH_P_IPV6)) {
165 ip6_flow_hdr(hdr, ip6_tclass(ip6_flowinfo(inner_hdr)),
166 flowlabel);
167 hdr->hop_limit = inner_hdr->hop_limit;
168 } else {
169 ip6_flow_hdr(hdr, 0, flowlabel);
170 hdr->hop_limit = ip6_dst_hoplimit(skb_dst(skb));
171
172 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
173
174 /* the control block has been erased, so we have to set the
175 * iif once again.
176 * We read the receiving interface index directly from the
177 * skb->skb_iif as it is done in the IPv4 receiving path (i.e.:
178 * ip_rcv_core(...)).
179 */
180 IP6CB(skb)->iif = skb->skb_iif;
181 }
182
183 hdr->nexthdr = NEXTHDR_ROUTING;
184
185 isrh = (void *)hdr + sizeof(*hdr);
186 memcpy(isrh, osrh, hdrlen);
187
188 isrh->nexthdr = proto;
189
190 hdr->daddr = isrh->segments[isrh->first_segment];
191 set_tun_src(net, skb_dst(skb)->dev, &hdr->daddr, &hdr->saddr);
192
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
© 2016 - 2024 Red Hat, Inc.