[PATCH v6] net: bonding: Add support for IPV6 ns/na to balance-alb/balance-tlb mode

[PATCH v6] net: bonding: Add support for IPV6 ns/na to balance-alb/balance-tlb mode

[Sun Shouxin]

Since ipv6 neighbor solicitation and advertisement messages
isn't handled gracefully in bonding6 driver, we can see packet
drop due to inconsistency bewteen mac address in the option
message and source MAC .

Another examples is ipv6 neighbor solicitation and advertisement
messages from VM via tap attached to host brighe, the src mac
mighe be changed through balance-alb mode, but it is not synced
with Link-layer address in the option message.

The patch implements bond6's tx handle for ipv6 neighbor
solicitation and advertisement messages.

Suggested-by: Hu Yadi <huyd12@chinatelecom.cn>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Sun Shouxin <sunshouxin@chinatelecom.cn>
---
 drivers/net/bonding/bond_alb.c | 36 ++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/drivers/net/bonding/bond_alb.c b/drivers/net/bonding/bond_alb.c
index 533e476988f2..82b7071840b1 100644
--- a/drivers/net/bonding/bond_alb.c
+++ b/drivers/net/bonding/bond_alb.c
@@ -1269,6 +1269,34 @@ static int alb_set_mac_address(struct bonding *bond, void *addr)
 	return res;
 }
 
+/*determine if the packet is NA or NS*/
+static bool __alb_determine_nd(struct icmp6hdr *hdr)
+{
+	if (hdr->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT ||
+	    hdr->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) {
+		return true;
+	}
+
+	return false;
+}
+
+static bool alb_determine_nd(struct sk_buff *skb, struct bonding *bond)
+{
+	struct ipv6hdr *ip6hdr;
+	struct icmp6hdr *hdr;
+
+	if (skb->protocol == htons(ETH_P_IPV6)) {
+		ip6hdr = ipv6_hdr(skb);
+		if (ip6hdr->nexthdr == IPPROTO_ICMPV6) {
+			hdr = icmp6_hdr(skb);
+			if (__alb_determine_nd(hdr))
+				return true;
+		}
+	}
+
+	return false;
+}
+
 /************************ exported alb functions ************************/
 
 int bond_alb_initialize(struct bonding *bond, int rlb_enabled)
@@ -1350,6 +1378,9 @@ struct slave *bond_xmit_tlb_slave_get(struct bonding *bond,
 		switch (skb->protocol) {
 		case htons(ETH_P_IP):
 		case htons(ETH_P_IPV6):
+			if (alb_determine_nd(skb, bond))
+				break;
+
 			hash_index = bond_xmit_hash(bond, skb);
 			if (bond->params.tlb_dynamic_lb) {
 				tx_slave = tlb_choose_channel(bond,
@@ -1446,6 +1477,11 @@ struct slave *bond_xmit_alb_slave_get(struct bonding *bond,
 			break;
 		}
 
+		if (alb_determine_nd(skb, bond)) {
+			do_tx_balance = false;
+			break;
+		}
+
 		hash_start = (char *)&ip6hdr->daddr;
 		hash_size = sizeof(ip6hdr->daddr);
 		break;

base-commit: 79e06c4c4950be2abd8ca5d2428a8c915aa62c24
-- 
2.27.0

Re: [PATCH v6] net: bonding: Add support for IPV6 ns/na to balance-alb/balance-tlb mode

[Jay Vosburgh]

Sun Shouxin <sunshouxin@chinatelecom.cn> wrote:

>Since ipv6 neighbor solicitation and advertisement messages
>isn't handled gracefully in bonding6 driver, we can see packet
>drop due to inconsistency bewteen mac address in the option
>message and source MAC .
>
>Another examples is ipv6 neighbor solicitation and advertisement
>messages from VM via tap attached to host brighe, the src mac
>mighe be changed through balance-alb mode, but it is not synced
>with Link-layer address in the option message.
>
>The patch implements bond6's tx handle for ipv6 neighbor
>solicitation and advertisement messages.

	As previously discussed, this looks reasonable to me to resolve
the described MAC discrepancy.  One minor nit is a couple of misspelled
words in the description above, "brighe" and "mighe."

Acked-by: Jay Vosburgh <jay.vosburgh@canonical.com>

	-J

>Suggested-by: Hu Yadi <huyd12@chinatelecom.cn>
>Reported-by: kernel test robot <lkp@intel.com>
>Signed-off-by: Sun Shouxin <sunshouxin@chinatelecom.cn>
>---
> drivers/net/bonding/bond_alb.c | 36 ++++++++++++++++++++++++++++++++++
> 1 file changed, 36 insertions(+)
>
>diff --git a/drivers/net/bonding/bond_alb.c b/drivers/net/bonding/bond_alb.c
>index 533e476988f2..82b7071840b1 100644
>--- a/drivers/net/bonding/bond_alb.c
>+++ b/drivers/net/bonding/bond_alb.c
>@@ -1269,6 +1269,34 @@ static int alb_set_mac_address(struct bonding *bond, void *addr)
> 	return res;
> }
> 
>+/*determine if the packet is NA or NS*/
>+static bool __alb_determine_nd(struct icmp6hdr *hdr)
>+{
>+	if (hdr->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT ||
>+	    hdr->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) {
>+		return true;
>+	}
>+
>+	return false;
>+}
>+
>+static bool alb_determine_nd(struct sk_buff *skb, struct bonding *bond)
>+{
>+	struct ipv6hdr *ip6hdr;
>+	struct icmp6hdr *hdr;
>+
>+	if (skb->protocol == htons(ETH_P_IPV6)) {
>+		ip6hdr = ipv6_hdr(skb);
>+		if (ip6hdr->nexthdr == IPPROTO_ICMPV6) {
>+			hdr = icmp6_hdr(skb);
>+			if (__alb_determine_nd(hdr))
>+				return true;
>+		}
>+	}
>+
>+	return false;
>+}
>+
> /************************ exported alb functions ************************/
> 
> int bond_alb_initialize(struct bonding *bond, int rlb_enabled)
>@@ -1350,6 +1378,9 @@ struct slave *bond_xmit_tlb_slave_get(struct bonding *bond,
> 		switch (skb->protocol) {
> 		case htons(ETH_P_IP):
> 		case htons(ETH_P_IPV6):
>+			if (alb_determine_nd(skb, bond))
>+				break;
>+
> 			hash_index = bond_xmit_hash(bond, skb);
> 			if (bond->params.tlb_dynamic_lb) {
> 				tx_slave = tlb_choose_channel(bond,
>@@ -1446,6 +1477,11 @@ struct slave *bond_xmit_alb_slave_get(struct bonding *bond,
> 			break;
> 		}
> 
>+		if (alb_determine_nd(skb, bond)) {
>+			do_tx_balance = false;
>+			break;
>+		}
>+
> 		hash_start = (char *)&ip6hdr->daddr;
> 		hash_size = sizeof(ip6hdr->daddr);
> 		break;
>
>base-commit: 79e06c4c4950be2abd8ca5d2428a8c915aa62c24
>-- 
>2.27.0
>

---
	-Jay Vosburgh, jay.vosburgh@canonical.com

Re: [PATCH v6] net: bonding: Add support for IPV6 ns/na to balance-alb/balance-tlb mode

[孙守鑫]

在 2022/1/21 14:25, Jay Vosburgh 写道:
> Sun Shouxin <sunshouxin@chinatelecom.cn> wrote:
>
>> Since ipv6 neighbor solicitation and advertisement messages
>> isn't handled gracefully in bonding6 driver, we can see packet
>> drop due to inconsistency bewteen mac address in the option
>> message and source MAC .
>>
>> Another examples is ipv6 neighbor solicitation and advertisement
>> messages from VM via tap attached to host brighe, the src mac
>> mighe be changed through balance-alb mode, but it is not synced
>> with Link-layer address in the option message.
>>
>> The patch implements bond6's tx handle for ipv6 neighbor
>> solicitation and advertisement messages.
> 	As previously discussed, this looks reasonable to me to resolve
> the described MAC discrepancy.  One minor nit is a couple of misspelled
> words in the description above, "brighe" and "mighe."
>
> Acked-by: Jay Vosburgh <jay.vosburgh@canonical.com>
>
> 	-J


Thanks your comment, I'll adjust it and send out V7 soon.


>
>> Suggested-by: Hu Yadi <huyd12@chinatelecom.cn>
>> Reported-by: kernel test robot <lkp@intel.com>
>> Signed-off-by: Sun Shouxin <sunshouxin@chinatelecom.cn>
>> ---
>> drivers/net/bonding/bond_alb.c | 36 ++++++++++++++++++++++++++++++++++
>> 1 file changed, 36 insertions(+)
>>
>> diff --git a/drivers/net/bonding/bond_alb.c b/drivers/net/bonding/bond_alb.c
>> index 533e476988f2..82b7071840b1 100644
>> --- a/drivers/net/bonding/bond_alb.c
>> +++ b/drivers/net/bonding/bond_alb.c
>> @@ -1269,6 +1269,34 @@ static int alb_set_mac_address(struct bonding *bond, void *addr)
>> 	return res;
>> }
>>
>> +/*determine if the packet is NA or NS*/
>> +static bool __alb_determine_nd(struct icmp6hdr *hdr)
>> +{
>> +	if (hdr->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT ||
>> +	    hdr->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION) {
>> +		return true;
>> +	}
>> +
>> +	return false;
>> +}
>> +
>> +static bool alb_determine_nd(struct sk_buff *skb, struct bonding *bond)
>> +{
>> +	struct ipv6hdr *ip6hdr;
>> +	struct icmp6hdr *hdr;
>> +
>> +	if (skb->protocol == htons(ETH_P_IPV6)) {
>> +		ip6hdr = ipv6_hdr(skb);
>> +		if (ip6hdr->nexthdr == IPPROTO_ICMPV6) {
>> +			hdr = icmp6_hdr(skb);
>> +			if (__alb_determine_nd(hdr))
>> +				return true;
>> +		}
>> +	}
>> +
>> +	return false;
>> +}
>> +
>> /************************ exported alb functions ************************/
>>
>> int bond_alb_initialize(struct bonding *bond, int rlb_enabled)
>> @@ -1350,6 +1378,9 @@ struct slave *bond_xmit_tlb_slave_get(struct bonding *bond,
>> 		switch (skb->protocol) {
>> 		case htons(ETH_P_IP):
>> 		case htons(ETH_P_IPV6):
>> +			if (alb_determine_nd(skb, bond))
>> +				break;
>> +
>> 			hash_index = bond_xmit_hash(bond, skb);
>> 			if (bond->params.tlb_dynamic_lb) {
>> 				tx_slave = tlb_choose_channel(bond,
>> @@ -1446,6 +1477,11 @@ struct slave *bond_xmit_alb_slave_get(struct bonding *bond,
>> 			break;
>> 		}
>>
>> +		if (alb_determine_nd(skb, bond)) {
>> +			do_tx_balance = false;
>> +			break;
>> +		}
>> +
>> 		hash_start = (char *)&ip6hdr->daddr;
>> 		hash_size = sizeof(ip6hdr->daddr);
>> 		break;
>>
>> base-commit: 79e06c4c4950be2abd8ca5d2428a8c915aa62c24
>> -- 
>> 2.27.0
>>
> ---
> 	-Jay Vosburgh, jay.vosburgh@canonical.com

Re: [PATCH v6] net: bonding: Add support for IPV6 ns/na to balance-alb/balance-tlb mode

[Jakub Kicinski]

On Fri, 21 Jan 2022 14:38:03 +0800 孙守鑫 wrote:
> Thanks your comment, I'll adjust it and send out V7 soon.

Next week, please, net-next is closed until 5.17-rc1 is released.