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

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Date:   Thu, 20 Jan 2022 22:25:26 -0800
From:   Jay Vosburgh <jay.vosburgh@...onical.com>
To:     Sun Shouxin <sunshouxin@...natelecom.cn>
cc:     vfalico@...il.com, andy@...yhouse.net, davem@...emloft.net,
        kuba@...nel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, huyd12@...natelecom.cn
Subject: Re: [PATCH v6] net: bonding: Add support for IPV6 ns/na to balance-alb/balance-tlb mode

Sun Shouxin <sunshouxin@...natelecom.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@...onical.com>

	-J

>Suggested-by: Hu Yadi <huyd12@...natelecom.cn>
>Reported-by: kernel test robot <lkp@...el.com>
>Signed-off-by: Sun Shouxin <sunshouxin@...natelecom.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@...onical.com