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Message-Id: <20220316084958.21169-2-sunshouxin@chinatelecom.cn>
Date: Wed, 16 Mar 2022 04:49:55 -0400
From: Sun Shouxin <sunshouxin@...natelecom.cn>
To: j.vosburgh@...il.com, vfalico@...il.com, andy@...yhouse.net,
davem@...emloft.net, kuba@...nel.org, yoshfuji@...ux-ipv6.org,
dsahern@...nel.org, oliver@...kum.org
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
huyd12@...natelecom.cn, sunshouxin@...natelecom.cn
Subject: [PATCH v3 1/4] net:ipv6:Refactor ndisc_send_na to support sending na by slave directly
Refactor ndisc_send_na to support sending na by slave directly.
Suggested-by: Hu Yadi <huyd12@...natelecom.cn>
Signed-off-by: Sun Shouxin <sunshouxin@...natelecom.cn>
---
changelog:
v1-->v2: remove ndisc_bond_send_na and refactor ndisc_send_na
v2-->v3: don't export ndisc_send_na
---
include/net/ipv6_stubs.h | 3 +-
include/net/ndisc.h | 9 +++++-
net/ipv6/ndisc.c | 64 +++++++++++++++++++++++++++++-----------
3 files changed, 56 insertions(+), 20 deletions(-)
diff --git a/include/net/ipv6_stubs.h b/include/net/ipv6_stubs.h
index 45e0339be6fa..2b64ea6590b6 100644
--- a/include/net/ipv6_stubs.h
+++ b/include/net/ipv6_stubs.h
@@ -56,7 +56,8 @@ struct ipv6_stub {
void (*udpv6_encap_enable)(void);
void (*ndisc_send_na)(struct net_device *dev, const struct in6_addr *daddr,
const struct in6_addr *solicited_addr,
- bool router, bool solicited, bool override, bool inc_opt);
+ bool router, bool solicited, bool override,
+ bool inc_opt, void *data);
#if IS_ENABLED(CONFIG_XFRM)
void (*xfrm6_local_rxpmtu)(struct sk_buff *skb, u32 mtu);
int (*xfrm6_udp_encap_rcv)(struct sock *sk, struct sk_buff *skb);
diff --git a/include/net/ndisc.h b/include/net/ndisc.h
index da7eec8669ec..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];
@@ -460,7 +466,8 @@ void ndisc_send_rs(struct net_device *dev,
const struct in6_addr *saddr, const struct in6_addr *daddr);
void ndisc_send_na(struct net_device *dev, const struct in6_addr *daddr,
const struct in6_addr *solicited_addr,
- bool router, bool solicited, bool override, bool inc_opt);
+ bool router, bool solicited, bool override, bool inc_opt,
+ void *data);
void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target);
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index fcb288b0ae13..47875aab86e5 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -518,29 +518,37 @@ EXPORT_SYMBOL(ndisc_send_skb);
void ndisc_send_na(struct net_device *dev, const struct in6_addr *daddr,
const struct in6_addr *solicited_addr,
- bool router, bool solicited, bool override, bool inc_opt)
+ bool router, bool solicited, bool override, bool inc_opt,
+ void *data)
{
struct sk_buff *skb;
struct in6_addr tmpaddr;
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)
@@ -568,8 +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)
@@ -591,7 +619,7 @@ static void ndisc_send_unsol_na(struct net_device *dev)
ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifa->addr,
/*router=*/ !!idev->cnf.forwarding,
/*solicited=*/ false, /*override=*/ true,
- /*inc_opt=*/ true);
+ /*inc_opt=*/ true, NULL);
}
read_unlock_bh(&idev->lock);
@@ -932,7 +960,7 @@ static void ndisc_recv_ns(struct sk_buff *skb)
if (dad) {
ndisc_send_na(dev, &in6addr_linklocal_allnodes, &msg->target,
- !!is_router, false, (ifp != NULL), true);
+ !!is_router, false, ifp, true, NULL);
goto out;
}
@@ -954,7 +982,7 @@ static void ndisc_recv_ns(struct sk_buff *skb)
NDISC_NEIGHBOUR_SOLICITATION, &ndopts);
if (neigh || !dev->header_ops) {
ndisc_send_na(dev, saddr, &msg->target, !!is_router,
- true, (ifp != NULL && inc), inc);
+ true, (ifp && inc), inc, NULL);
if (neigh)
neigh_release(neigh);
}
--
2.27.0
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