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* [PATCH net-next v3 0/2] Add helper functions to parse netlink msg of ip_tunnel
@ 2022-09-29 13:52 Liu Jian
  2022-09-29 13:52 ` [PATCH net-next v3 1/2] net: Add helper function to parse netlink msg of ip_tunnel_encap Liu Jian
                   ` (2 more replies)
  0 siblings, 3 replies; 4+ messages in thread
From: Liu Jian @ 2022-09-29 13:52 UTC (permalink / raw)
  To: davem, yoshfuji, dsahern, edumazet, kuba, pabeni, netdev; +Cc: liujian56

Add helper functions to parse netlink msg of ip_tunnel

v1->v2: Move the implementation of the helper function to ip_tunnel_core.c
v2->v3: Change EXPORT_SYMBOL to EXPORT_SYMBOL_GPL

Liu Jian (2):
  net: Add helper function to parse netlink msg of ip_tunnel_encap
  net: Add helper function to parse netlink msg of ip_tunnel_parm

 include/net/ip_tunnels.h  |  6 ++++
 net/ipv4/ip_tunnel_core.c | 67 +++++++++++++++++++++++++++++++++++++++
 net/ipv4/ipip.c           | 62 ++----------------------------------
 net/ipv6/ip6_tunnel.c     | 37 ++-------------------
 net/ipv6/sit.c            | 65 ++-----------------------------------
 5 files changed, 81 insertions(+), 156 deletions(-)

-- 
2.17.1


^ permalink raw reply	[flat|nested] 4+ messages in thread

* [PATCH net-next v3 1/2] net: Add helper function to parse netlink msg of ip_tunnel_encap
  2022-09-29 13:52 [PATCH net-next v3 0/2] Add helper functions to parse netlink msg of ip_tunnel Liu Jian
@ 2022-09-29 13:52 ` Liu Jian
  2022-09-29 13:52 ` [PATCH net-next v3 2/2] net: Add helper function to parse netlink msg of ip_tunnel_parm Liu Jian
  2022-10-03  7:10 ` [PATCH net-next v3 0/2] Add helper functions to parse netlink msg of ip_tunnel patchwork-bot+netdevbpf
  2 siblings, 0 replies; 4+ messages in thread
From: Liu Jian @ 2022-09-29 13:52 UTC (permalink / raw)
  To: davem, yoshfuji, dsahern, edumazet, kuba, pabeni, netdev; +Cc: liujian56

Add ip_tunnel_netlink_encap_parms to parse netlink msg of ip_tunnel_encap.
Reduces duplicate code, no actual functional changes.

Signed-off-by: Liu Jian <liujian56@huawei.com>
---
v2->v3: Change EXPORT_SYMBOL to EXPORT_SYMBOL_GPL
 include/net/ip_tunnels.h  |  3 +++
 net/ipv4/ip_tunnel_core.c | 35 +++++++++++++++++++++++++++++++++++
 net/ipv4/ipip.c           | 38 ++------------------------------------
 net/ipv6/ip6_tunnel.c     | 37 ++-----------------------------------
 net/ipv6/sit.c            | 38 ++------------------------------------
 5 files changed, 44 insertions(+), 107 deletions(-)

diff --git a/include/net/ip_tunnels.h b/include/net/ip_tunnels.h
index ced80e2f8b58..51da2957cf48 100644
--- a/include/net/ip_tunnels.h
+++ b/include/net/ip_tunnels.h
@@ -302,6 +302,9 @@ int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[],
 		      struct ip_tunnel_parm *p, __u32 fwmark);
 void ip_tunnel_setup(struct net_device *dev, unsigned int net_id);
 
+bool ip_tunnel_netlink_encap_parms(struct nlattr *data[],
+				   struct ip_tunnel_encap *encap);
+
 extern const struct header_ops ip_tunnel_header_ops;
 __be16 ip_tunnel_parse_protocol(const struct sk_buff *skb);
 
diff --git a/net/ipv4/ip_tunnel_core.c b/net/ipv4/ip_tunnel_core.c
index cc1caab4a654..6d08f7e39191 100644
--- a/net/ipv4/ip_tunnel_core.c
+++ b/net/ipv4/ip_tunnel_core.c
@@ -1079,3 +1079,38 @@ EXPORT_SYMBOL(ip_tunnel_parse_protocol);
 
 const struct header_ops ip_tunnel_header_ops = { .parse_protocol = ip_tunnel_parse_protocol };
 EXPORT_SYMBOL(ip_tunnel_header_ops);
+
+/* This function returns true when ENCAP attributes are present in the nl msg */
+bool ip_tunnel_netlink_encap_parms(struct nlattr *data[],
+				   struct ip_tunnel_encap *encap)
+{
+	bool ret = false;
+
+	memset(encap, 0, sizeof(*encap));
+
+	if (!data)
+		return ret;
+
+	if (data[IFLA_IPTUN_ENCAP_TYPE]) {
+		ret = true;
+		encap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
+	}
+
+	if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
+		ret = true;
+		encap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
+	}
+
+	if (data[IFLA_IPTUN_ENCAP_SPORT]) {
+		ret = true;
+		encap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
+	}
+
+	if (data[IFLA_IPTUN_ENCAP_DPORT]) {
+		ret = true;
+		encap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(ip_tunnel_netlink_encap_parms);
diff --git a/net/ipv4/ipip.c b/net/ipv4/ipip.c
index 123ea63a04cb..7c64ca06adf3 100644
--- a/net/ipv4/ipip.c
+++ b/net/ipv4/ipip.c
@@ -448,40 +448,6 @@ static void ipip_netlink_parms(struct nlattr *data[],
 		*fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]);
 }
 
-/* This function returns true when ENCAP attributes are present in the nl msg */
-static bool ipip_netlink_encap_parms(struct nlattr *data[],
-				     struct ip_tunnel_encap *ipencap)
-{
-	bool ret = false;
-
-	memset(ipencap, 0, sizeof(*ipencap));
-
-	if (!data)
-		return ret;
-
-	if (data[IFLA_IPTUN_ENCAP_TYPE]) {
-		ret = true;
-		ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
-	}
-
-	if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
-		ret = true;
-		ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
-	}
-
-	if (data[IFLA_IPTUN_ENCAP_SPORT]) {
-		ret = true;
-		ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
-	}
-
-	if (data[IFLA_IPTUN_ENCAP_DPORT]) {
-		ret = true;
-		ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
-	}
-
-	return ret;
-}
-
 static int ipip_newlink(struct net *src_net, struct net_device *dev,
 			struct nlattr *tb[], struct nlattr *data[],
 			struct netlink_ext_ack *extack)
@@ -491,7 +457,7 @@ static int ipip_newlink(struct net *src_net, struct net_device *dev,
 	struct ip_tunnel_encap ipencap;
 	__u32 fwmark = 0;
 
-	if (ipip_netlink_encap_parms(data, &ipencap)) {
+	if (ip_tunnel_netlink_encap_parms(data, &ipencap)) {
 		int err = ip_tunnel_encap_setup(t, &ipencap);
 
 		if (err < 0)
@@ -512,7 +478,7 @@ static int ipip_changelink(struct net_device *dev, struct nlattr *tb[],
 	bool collect_md;
 	__u32 fwmark = t->fwmark;
 
-	if (ipip_netlink_encap_parms(data, &ipencap)) {
+	if (ip_tunnel_netlink_encap_parms(data, &ipencap)) {
 		int err = ip_tunnel_encap_setup(t, &ipencap);
 
 		if (err < 0)
diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index 9e97f3b4c7e8..cc5d5e75b658 100644
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -1988,39 +1988,6 @@ static void ip6_tnl_netlink_parms(struct nlattr *data[],
 		parms->fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]);
 }
 
-static bool ip6_tnl_netlink_encap_parms(struct nlattr *data[],
-					struct ip_tunnel_encap *ipencap)
-{
-	bool ret = false;
-
-	memset(ipencap, 0, sizeof(*ipencap));
-
-	if (!data)
-		return ret;
-
-	if (data[IFLA_IPTUN_ENCAP_TYPE]) {
-		ret = true;
-		ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
-	}
-
-	if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
-		ret = true;
-		ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
-	}
-
-	if (data[IFLA_IPTUN_ENCAP_SPORT]) {
-		ret = true;
-		ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
-	}
-
-	if (data[IFLA_IPTUN_ENCAP_DPORT]) {
-		ret = true;
-		ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
-	}
-
-	return ret;
-}
-
 static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev,
 			   struct nlattr *tb[], struct nlattr *data[],
 			   struct netlink_ext_ack *extack)
@@ -2033,7 +2000,7 @@ static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev,
 
 	nt = netdev_priv(dev);
 
-	if (ip6_tnl_netlink_encap_parms(data, &ipencap)) {
+	if (ip_tunnel_netlink_encap_parms(data, &ipencap)) {
 		err = ip6_tnl_encap_setup(nt, &ipencap);
 		if (err < 0)
 			return err;
@@ -2070,7 +2037,7 @@ static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[],
 	if (dev == ip6n->fb_tnl_dev)
 		return -EINVAL;
 
-	if (ip6_tnl_netlink_encap_parms(data, &ipencap)) {
+	if (ip_tunnel_netlink_encap_parms(data, &ipencap)) {
 		int err = ip6_tnl_encap_setup(t, &ipencap);
 
 		if (err < 0)
diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index 98f1cf40746f..a8a258f672fa 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -1534,40 +1534,6 @@ static void ipip6_netlink_parms(struct nlattr *data[],
 		*fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]);
 }
 
-/* This function returns true when ENCAP attributes are present in the nl msg */
-static bool ipip6_netlink_encap_parms(struct nlattr *data[],
-				      struct ip_tunnel_encap *ipencap)
-{
-	bool ret = false;
-
-	memset(ipencap, 0, sizeof(*ipencap));
-
-	if (!data)
-		return ret;
-
-	if (data[IFLA_IPTUN_ENCAP_TYPE]) {
-		ret = true;
-		ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
-	}
-
-	if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
-		ret = true;
-		ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
-	}
-
-	if (data[IFLA_IPTUN_ENCAP_SPORT]) {
-		ret = true;
-		ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
-	}
-
-	if (data[IFLA_IPTUN_ENCAP_DPORT]) {
-		ret = true;
-		ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
-	}
-
-	return ret;
-}
-
 #ifdef CONFIG_IPV6_SIT_6RD
 /* This function returns true when 6RD attributes are present in the nl msg */
 static bool ipip6_netlink_6rd_parms(struct nlattr *data[],
@@ -1619,7 +1585,7 @@ static int ipip6_newlink(struct net *src_net, struct net_device *dev,
 
 	nt = netdev_priv(dev);
 
-	if (ipip6_netlink_encap_parms(data, &ipencap)) {
+	if (ip_tunnel_netlink_encap_parms(data, &ipencap)) {
 		err = ip_tunnel_encap_setup(nt, &ipencap);
 		if (err < 0)
 			return err;
@@ -1671,7 +1637,7 @@ static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[],
 	if (dev == sitn->fb_tunnel_dev)
 		return -EINVAL;
 
-	if (ipip6_netlink_encap_parms(data, &ipencap)) {
+	if (ip_tunnel_netlink_encap_parms(data, &ipencap)) {
 		err = ip_tunnel_encap_setup(t, &ipencap);
 		if (err < 0)
 			return err;
-- 
2.17.1


^ permalink raw reply related	[flat|nested] 4+ messages in thread

* [PATCH net-next v3 2/2] net: Add helper function to parse netlink msg of ip_tunnel_parm
  2022-09-29 13:52 [PATCH net-next v3 0/2] Add helper functions to parse netlink msg of ip_tunnel Liu Jian
  2022-09-29 13:52 ` [PATCH net-next v3 1/2] net: Add helper function to parse netlink msg of ip_tunnel_encap Liu Jian
@ 2022-09-29 13:52 ` Liu Jian
  2022-10-03  7:10 ` [PATCH net-next v3 0/2] Add helper functions to parse netlink msg of ip_tunnel patchwork-bot+netdevbpf
  2 siblings, 0 replies; 4+ messages in thread
From: Liu Jian @ 2022-09-29 13:52 UTC (permalink / raw)
  To: davem, yoshfuji, dsahern, edumazet, kuba, pabeni, netdev; +Cc: liujian56

Add ip_tunnel_netlink_parms to parse netlink msg of ip_tunnel_parm.
Reduces duplicate code, no actual functional changes.

Signed-off-by: Liu Jian <liujian56@huawei.com>
---
v2->v3: Change EXPORT_SYMBOL to EXPORT_SYMBOL_GPL
 include/net/ip_tunnels.h  |  3 +++
 net/ipv4/ip_tunnel_core.c | 32 ++++++++++++++++++++++++++++++++
 net/ipv4/ipip.c           | 24 +-----------------------
 net/ipv6/sit.c            | 27 +--------------------------
 4 files changed, 37 insertions(+), 49 deletions(-)

diff --git a/include/net/ip_tunnels.h b/include/net/ip_tunnels.h
index 51da2957cf48..fca357679816 100644
--- a/include/net/ip_tunnels.h
+++ b/include/net/ip_tunnels.h
@@ -305,6 +305,9 @@ void ip_tunnel_setup(struct net_device *dev, unsigned int net_id);
 bool ip_tunnel_netlink_encap_parms(struct nlattr *data[],
 				   struct ip_tunnel_encap *encap);
 
+void ip_tunnel_netlink_parms(struct nlattr *data[],
+			     struct ip_tunnel_parm *parms);
+
 extern const struct header_ops ip_tunnel_header_ops;
 __be16 ip_tunnel_parse_protocol(const struct sk_buff *skb);
 
diff --git a/net/ipv4/ip_tunnel_core.c b/net/ipv4/ip_tunnel_core.c
index 6d08f7e39191..92c02c886fe7 100644
--- a/net/ipv4/ip_tunnel_core.c
+++ b/net/ipv4/ip_tunnel_core.c
@@ -1114,3 +1114,35 @@ bool ip_tunnel_netlink_encap_parms(struct nlattr *data[],
 	return ret;
 }
 EXPORT_SYMBOL_GPL(ip_tunnel_netlink_encap_parms);
+
+void ip_tunnel_netlink_parms(struct nlattr *data[],
+			     struct ip_tunnel_parm *parms)
+{
+	if (data[IFLA_IPTUN_LINK])
+		parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
+
+	if (data[IFLA_IPTUN_LOCAL])
+		parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]);
+
+	if (data[IFLA_IPTUN_REMOTE])
+		parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]);
+
+	if (data[IFLA_IPTUN_TTL]) {
+		parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]);
+		if (parms->iph.ttl)
+			parms->iph.frag_off = htons(IP_DF);
+	}
+
+	if (data[IFLA_IPTUN_TOS])
+		parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]);
+
+	if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC]))
+		parms->iph.frag_off = htons(IP_DF);
+
+	if (data[IFLA_IPTUN_FLAGS])
+		parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]);
+
+	if (data[IFLA_IPTUN_PROTO])
+		parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]);
+}
+EXPORT_SYMBOL_GPL(ip_tunnel_netlink_parms);
diff --git a/net/ipv4/ipip.c b/net/ipv4/ipip.c
index 7c64ca06adf3..180f9daf5bec 100644
--- a/net/ipv4/ipip.c
+++ b/net/ipv4/ipip.c
@@ -417,29 +417,7 @@ static void ipip_netlink_parms(struct nlattr *data[],
 	if (!data)
 		return;
 
-	if (data[IFLA_IPTUN_LINK])
-		parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
-
-	if (data[IFLA_IPTUN_LOCAL])
-		parms->iph.saddr = nla_get_in_addr(data[IFLA_IPTUN_LOCAL]);
-
-	if (data[IFLA_IPTUN_REMOTE])
-		parms->iph.daddr = nla_get_in_addr(data[IFLA_IPTUN_REMOTE]);
-
-	if (data[IFLA_IPTUN_TTL]) {
-		parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]);
-		if (parms->iph.ttl)
-			parms->iph.frag_off = htons(IP_DF);
-	}
-
-	if (data[IFLA_IPTUN_TOS])
-		parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]);
-
-	if (data[IFLA_IPTUN_PROTO])
-		parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]);
-
-	if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC]))
-		parms->iph.frag_off = htons(IP_DF);
+	ip_tunnel_netlink_parms(data, parms);
 
 	if (data[IFLA_IPTUN_COLLECT_METADATA])
 		*collect_md = true;
diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index a8a258f672fa..d27683e3fc97 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -1503,32 +1503,7 @@ static void ipip6_netlink_parms(struct nlattr *data[],
 	if (!data)
 		return;
 
-	if (data[IFLA_IPTUN_LINK])
-		parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
-
-	if (data[IFLA_IPTUN_LOCAL])
-		parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]);
-
-	if (data[IFLA_IPTUN_REMOTE])
-		parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]);
-
-	if (data[IFLA_IPTUN_TTL]) {
-		parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]);
-		if (parms->iph.ttl)
-			parms->iph.frag_off = htons(IP_DF);
-	}
-
-	if (data[IFLA_IPTUN_TOS])
-		parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]);
-
-	if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC]))
-		parms->iph.frag_off = htons(IP_DF);
-
-	if (data[IFLA_IPTUN_FLAGS])
-		parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]);
-
-	if (data[IFLA_IPTUN_PROTO])
-		parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]);
+	ip_tunnel_netlink_parms(data, parms);
 
 	if (data[IFLA_IPTUN_FWMARK])
 		*fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]);
-- 
2.17.1


^ permalink raw reply related	[flat|nested] 4+ messages in thread

* Re: [PATCH net-next v3 0/2] Add helper functions to parse netlink msg of ip_tunnel
  2022-09-29 13:52 [PATCH net-next v3 0/2] Add helper functions to parse netlink msg of ip_tunnel Liu Jian
  2022-09-29 13:52 ` [PATCH net-next v3 1/2] net: Add helper function to parse netlink msg of ip_tunnel_encap Liu Jian
  2022-09-29 13:52 ` [PATCH net-next v3 2/2] net: Add helper function to parse netlink msg of ip_tunnel_parm Liu Jian
@ 2022-10-03  7:10 ` patchwork-bot+netdevbpf
  2 siblings, 0 replies; 4+ messages in thread
From: patchwork-bot+netdevbpf @ 2022-10-03  7:10 UTC (permalink / raw)
  To: Liu Jian; +Cc: davem, yoshfuji, dsahern, edumazet, kuba, pabeni, netdev

Hello:

This series was applied to netdev/net-next.git (master)
by David S. Miller <davem@davemloft.net>:

On Thu, 29 Sep 2022 21:52:01 +0800 you wrote:
> Add helper functions to parse netlink msg of ip_tunnel
> 
> v1->v2: Move the implementation of the helper function to ip_tunnel_core.c
> v2->v3: Change EXPORT_SYMBOL to EXPORT_SYMBOL_GPL
> 
> Liu Jian (2):
>   net: Add helper function to parse netlink msg of ip_tunnel_encap
>   net: Add helper function to parse netlink msg of ip_tunnel_parm
> 
> [...]

Here is the summary with links:
  - [net-next,v3,1/2] net: Add helper function to parse netlink msg of ip_tunnel_encap
    https://git.kernel.org/netdev/net-next/c/537dd2d9fb9f
  - [net-next,v3,2/2] net: Add helper function to parse netlink msg of ip_tunnel_parm
    https://git.kernel.org/netdev/net-next/c/b86fca800a6a

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html



^ permalink raw reply	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2022-10-03  7:10 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2022-09-29 13:52 [PATCH net-next v3 0/2] Add helper functions to parse netlink msg of ip_tunnel Liu Jian
2022-09-29 13:52 ` [PATCH net-next v3 1/2] net: Add helper function to parse netlink msg of ip_tunnel_encap Liu Jian
2022-09-29 13:52 ` [PATCH net-next v3 2/2] net: Add helper function to parse netlink msg of ip_tunnel_parm Liu Jian
2022-10-03  7:10 ` [PATCH net-next v3 0/2] Add helper functions to parse netlink msg of ip_tunnel patchwork-bot+netdevbpf

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