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ipv6: separate ndisc_ns_create() from ndisc_send_ns()

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This patch separate NS message allocation steps from ndisc_send_ns(),
so it could be used in other places, like bonding, to allocate and
send IPv6 NS message.

Also export ndisc_send_skb() and ndisc_ns_create() for later bonding usage.

Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Hangbin Liu 2022-02-21 13:54:53 +08:00 committed by David S. Miller
parent 91398a960e
commit 696c654441
2 changed files with 37 additions and 17 deletions
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5
include/net/ndisc.h
View File

@ -447,10 +447,15 @@ void ndisc_cleanup(void);
int ndisc_rcv(struct sk_buff *skb);
struct sk_buff *ndisc_ns_create(struct net_device *dev, const struct in6_addr *solicit,
const struct in6_addr *saddr, u64 nonce);
void ndisc_send_ns(struct net_device *dev, const struct in6_addr *solicit,
const struct in6_addr *daddr, const struct in6_addr *saddr,
u64 nonce);
void ndisc_send_skb(struct sk_buff *skb, const struct in6_addr *daddr,
const struct in6_addr *saddr);
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,

49
net/ipv6/ndisc.c
View File

@ -466,9 +466,8 @@ static void ip6_nd_hdr(struct sk_buff *skb,
hdr->daddr = *daddr;
}
static void ndisc_send_skb(struct sk_buff *skb,
const struct in6_addr *daddr,
const struct in6_addr *saddr)
void ndisc_send_skb(struct sk_buff *skb, const struct in6_addr *daddr,
const struct in6_addr *saddr)
{
struct dst_entry *dst = skb_dst(skb);
struct net *net = dev_net(skb->dev);
@ -515,6 +514,7 @@ static void ndisc_send_skb(struct sk_buff *skb,
rcu_read_unlock();
}
EXPORT_SYMBOL(ndisc_send_skb);
void ndisc_send_na(struct net_device *dev, const struct in6_addr *daddr,
const struct in6_addr *solicited_addr,
@ -598,22 +598,16 @@ static void ndisc_send_unsol_na(struct net_device *dev)
in6_dev_put(idev);
}
void ndisc_send_ns(struct net_device *dev, const struct in6_addr *solicit,
const struct in6_addr *daddr, const struct in6_addr *saddr,
u64 nonce)
struct sk_buff *ndisc_ns_create(struct net_device *dev, const struct in6_addr *solicit,
const struct in6_addr *saddr, u64 nonce)
{
struct sk_buff *skb;
struct in6_addr addr_buf;
int inc_opt = dev->addr_len;
int optlen = 0;
struct sk_buff *skb;
struct nd_msg *msg;
int optlen = 0;
if (!saddr) {
if (ipv6_get_lladdr(dev, &addr_buf,
(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)))
return;
saddr = &addr_buf;
}
if (!saddr)
return NULL;
if (ipv6_addr_any(saddr))
inc_opt = false;
@ -625,7 +619,7 @@ void ndisc_send_ns(struct net_device *dev, const struct in6_addr *solicit,
skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen);
if (!skb)
return;
return NULL;
msg = skb_put(skb, sizeof(*msg));
*msg = (struct nd_msg) {
@ -647,7 +641,28 @@ void ndisc_send_ns(struct net_device *dev, const struct in6_addr *solicit,
memcpy(opt + 2, &nonce, 6);
}
ndisc_send_skb(skb, daddr, saddr);
return skb;
}
EXPORT_SYMBOL(ndisc_ns_create);
void ndisc_send_ns(struct net_device *dev, const struct in6_addr *solicit,
const struct in6_addr *daddr, const struct in6_addr *saddr,
u64 nonce)
{
struct in6_addr addr_buf;
struct sk_buff *skb;
if (!saddr) {
if (ipv6_get_lladdr(dev, &addr_buf,
(IFA_F_TENTATIVE | IFA_F_OPTIMISTIC)))
return;
saddr = &addr_buf;
}
skb = ndisc_ns_create(dev, solicit, saddr, nonce);
if (skb)
ndisc_send_skb(skb, daddr, saddr);
}
void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr,