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From:   Sun Shouxin <sunshouxin@chinatelecom.cn>
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        huyd12@chinatelecom.cn, sunshouxin@chinatelecom.cn
Subject: [PATCH v6 2/4] net:ipv6:Refactor ndisc_send_na to support sending na by slave directly
Date:   Wed, 23 Mar 2022 08:09:04 -0400
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Refactor ndisc_send_na to support sending na by slave directly.

Signed-off-by: Sun Shouxin <sunshouxin@chinatelecom.cn>
---
 include/net/ndisc.h |  6 +++++
 net/ipv6/ndisc.c    | 55 +++++++++++++++++++++++++++++++++------------
 2 files changed, 47 insertions(+), 14 deletions(-)

diff --git a/include/net/ndisc.h b/include/net/ndisc.h
index 24cf6e92fecc..e71702a44a3d 100644
--- a/include/net/ndisc.h
+++ b/include/net/ndisc.h
@@ -107,6 +107,12 @@ struct nd_opt_hdr {
 	__u8		nd_opt_len;
 } __packed;
 
+struct nd_sendinfo {
+	__u16 vlanid;
+	void *mac_dst;
+	const void *mac_src;
+};
+
 /* ND options */
 struct ndisc_options {
 	struct nd_opt_hdr *nd_opt_array[__ND_OPT_ARRAY_MAX];
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index f7bd7082abb4..47875aab86e5 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -526,22 +526,29 @@ void ndisc_send_na(struct net_device *dev, const struct in6_addr *daddr,
 	struct inet6_ifaddr *ifp;
 	const struct in6_addr *src_addr;
 	struct nd_msg *msg;
+	struct nd_sendinfo *sendinfo = data;
+	struct net *net = dev_net(dev);
+	struct sock *sk = net->ipv6.ndisc_sk;
 	int optlen = 0;
 
-	/* for anycast or proxy, solicited_addr != src_addr */
-	ifp = ipv6_get_ifaddr(dev_net(dev), solicited_addr, dev, 1);
-	if (ifp) {
-		src_addr = solicited_addr;
-		if (ifp->flags & IFA_F_OPTIMISTIC)
-			override = false;
-		inc_opt |= ifp->idev->cnf.force_tllao;
-		in6_ifa_put(ifp);
+	if (!sendinfo) {
+		/* for anycast or proxy, solicited_addr != src_addr */
+		ifp = ipv6_get_ifaddr(dev_net(dev), solicited_addr, dev, 1);
+		if (ifp) {
+			src_addr = solicited_addr;
+			if (ifp->flags & IFA_F_OPTIMISTIC)
+				override = false;
+			inc_opt |= ifp->idev->cnf.force_tllao;
+			in6_ifa_put(ifp);
+		} else {
+			if (ipv6_dev_get_saddr(dev_net(dev), dev, daddr,
+					       inet6_sk(dev_net(dev)->ipv6.ndisc_sk)->srcprefs,
+					       &tmpaddr))
+				return;
+			src_addr = &tmpaddr;
+		}
 	} else {
-		if (ipv6_dev_get_saddr(dev_net(dev), dev, daddr,
-				       inet6_sk(dev_net(dev)->ipv6.ndisc_sk)->srcprefs,
-				       &tmpaddr))
-			return;
-		src_addr = &tmpaddr;
+		src_addr = solicited_addr;
 	}
 
 	if (!dev->addr_len)
@@ -569,8 +576,28 @@ void ndisc_send_na(struct net_device *dev, const struct in6_addr *daddr,
 		ndisc_fill_addr_option(skb, ND_OPT_TARGET_LL_ADDR,
 				       dev->dev_addr,
 				       NDISC_NEIGHBOUR_ADVERTISEMENT);
+	if (!sendinfo) {
+		ndisc_send_skb(skb, daddr, src_addr);
+	} else {
+		if (sendinfo->vlanid)
+			__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
+					       sendinfo->vlanid);
+
+		msg->icmph.icmp6_cksum = csum_ipv6_magic(src_addr, daddr, skb->len,
+							 IPPROTO_ICMPV6,
+							 csum_partial(&msg->icmph,
+								      skb->len, 0));
 
-	ndisc_send_skb(skb, daddr, src_addr);
+		ip6_nd_hdr(skb, src_addr, daddr, inet6_sk(sk)->hop_limit, skb->len);
+
+		skb->protocol = htons(ETH_P_IPV6);
+		skb->dev = dev;
+		if (dev_hard_header(skb, dev, ETH_P_IPV6, sendinfo->mac_dst,
+				    sendinfo->mac_src, skb->len) < 0)
+			return;
+
+		dev_queue_xmit(skb);
+	}
 }
 
 static void ndisc_send_unsol_na(struct net_device *dev)
-- 
2.27.0