This patch introduces neighbour discovery ops callback structure. The
structure contains at first receive and transmit handling for NS/NA and
userspace option field functionality.
These callback offers 6lowpan different handling, such as 802.15.4 short
address handling or RFC6775 (Neighbor Discovery Optimization for IPv6 over
6LoWPANs).
Cc: David S. Miller <davem@xxxxxxxxxxxxx>
Cc: Alexey Kuznetsov <kuznet@xxxxxxxxxxxxx>
Cc: James Morris <jmorris@xxxxxxxxx>
Cc: Hideaki YOSHIFUJI <yoshfuji@xxxxxxxxxxxxxx>
Cc: Patrick McHardy <kaber@xxxxxxxxx>
Signed-off-by: Alexander Aring <aar@xxxxxxxxxxxxxx>
---
include/linux/netdevice.h | 3 ++
include/net/ndisc.h | 96 +++++++++++++++++++++++++++++++++++++++++++----
net/ipv6/addrconf.c | 1 +
net/ipv6/ndisc.c | 71 ++++++++++++++++++++++++-----------
net/ipv6/route.c | 2 +-
5 files changed, 144 insertions(+), 29 deletions(-)
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 0052c42..bc60033 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1677,6 +1677,9 @@ struct net_device {
#ifdef CONFIG_NET_L3_MASTER_DEV
const struct l3mdev_ops *l3mdev_ops;
#endif
+#if IS_ENABLED(CONFIG_IPV6)
+ const struct ndisc_ops *ndisc_ops;
+#endif
const struct header_ops *header_ops;
diff --git a/include/net/ndisc.h b/include/net/ndisc.h
index aac868e..14ed016 100644
--- a/include/net/ndisc.h
+++ b/include/net/ndisc.h
@@ -110,7 +110,8 @@ struct ndisc_options {
#define NDISC_OPT_SPACE(len) (((len)+2+7)&~7)
-struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len,
+struct ndisc_options *ndisc_parse_options(const struct net_device *dev,
+ u8 *opt, int opt_len,
struct ndisc_options *ndopts);
/*
@@ -173,6 +174,93 @@ static inline struct neighbour *__ipv6_neigh_lookup(struct net_device *dev, cons
return n;
}
+static inline int __ip6_ndisc_is_useropt(struct nd_opt_hdr *opt)
+{
+ return opt->nd_opt_type == ND_OPT_RDNSS ||
+ opt->nd_opt_type == ND_OPT_DNSSL;
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+struct ndisc_ops {
+ int (*is_useropt)(struct nd_opt_hdr *opt);
+ void (*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);
+ void (*recv_na)(struct sk_buff *skb);
+ void (*send_ns)(struct net_device *dev,
+ const struct in6_addr *solicit,
+ const struct in6_addr *daddr,
+ const struct in6_addr *saddr);
+ void (*recv_ns)(struct sk_buff *skb);
+};
+
+static inline int ndisc_is_useropt(const struct net_device *dev,
+ struct nd_opt_hdr *opt)
+{
+ if (likely(dev->ndisc_ops->is_useropt))
+ return dev->ndisc_ops->is_useropt(opt);
+ else
+ return 0;
+}
+
+static inline 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)
+{
+ if (likely(dev->ndisc_ops->send_na))
+ dev->ndisc_ops->send_na(dev, daddr, solicited_addr, router,
+ solicited, override, inc_opt);
+}
+
+static inline void ndisc_recv_na(struct sk_buff *skb)
+{
+ if (likely(skb->dev->ndisc_ops->recv_na))
+ skb->dev->ndisc_ops->recv_na(skb);
+}
+
+static inline void ndisc_send_ns(struct net_device *dev,
+ const struct in6_addr *solicit,
+ const struct in6_addr *daddr,
+ const struct in6_addr *saddr)
+{
+ if (likely(dev->ndisc_ops->send_ns))
+ dev->ndisc_ops->send_ns(dev, solicit, daddr, saddr);
+}
+
+static inline void ndisc_recv_ns(struct sk_buff *skb)
+{
+ if (likely(skb->dev->ndisc_ops->recv_ns))
+ skb->dev->ndisc_ops->recv_ns(skb);
+}
+#else
+static inline int ndisc_is_useropt(const struct net_device *dev,
+ struct nd_opt_hdr *opt)
+{
+ return 0;
+}
+
+static inline 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) { }
+
+static inline void ndisc_recv_na(struct sk_buff *skb) { }
+
+static inline void ndisc_send_ns(struct net_device *dev,
+ const struct in6_addr *solicit,
+ const struct in6_addr *daddr,
+ const struct in6_addr *saddr) { }
+
+static inline void ndisc_recv_ns(struct sk_buff *skb) { }
+#endif
+
+void ip6_register_ndisc_ops(struct net_device *dev);
+
int ndisc_init(void);
int ndisc_late_init(void);
@@ -181,14 +269,8 @@ void ndisc_cleanup(void);
int ndisc_rcv(struct sk_buff *skb);
-void ndisc_send_ns(struct net_device *dev, const struct in6_addr *solicit,
- 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,
- const struct in6_addr *solicited_addr,
- bool router, bool solicited, bool override, bool inc_opt);
void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target);
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 54e18c2..a2ef04b 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -3266,6 +3266,7 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event,
idev = ipv6_add_dev(dev);
if (IS_ERR(idev))
return notifier_from_errno(PTR_ERR(idev));
+ ip6_register_ndisc_ops(dev);
}
break;
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 176c7c4..297080a 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -185,24 +185,25 @@ static struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur,
return cur <= end && cur->nd_opt_type == type ? cur : NULL;
}
-static inline int ndisc_is_useropt(struct nd_opt_hdr *opt)
+static inline int ip6_ndisc_is_useropt(struct nd_opt_hdr *opt)
{
- return opt->nd_opt_type == ND_OPT_RDNSS ||
- opt->nd_opt_type == ND_OPT_DNSSL;
+ return __ip6_ndisc_is_useropt(opt);
}
-static struct nd_opt_hdr *ndisc_next_useropt(struct nd_opt_hdr *cur,
+static struct nd_opt_hdr *ndisc_next_useropt(const struct net_device *dev,
+ struct nd_opt_hdr *cur,
struct nd_opt_hdr *end)
{
if (!cur || !end || cur >= end)
return NULL;
do {
cur = ((void *)cur) + (cur->nd_opt_len << 3);
- } while (cur < end && !ndisc_is_useropt(cur));
- return cur <= end && ndisc_is_useropt(cur) ? cur : NULL;
+ } while (cur < end && !ndisc_is_useropt(dev, cur));
+ return cur <= end && ndisc_is_useropt(dev, cur) ? cur : NULL;
}
-struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len,
+struct ndisc_options *ndisc_parse_options(const struct net_device *dev,
+ u8 *opt, int opt_len,
struct ndisc_options *ndopts)
{
struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)opt;
@@ -243,7 +244,7 @@ struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len,
break;
#endif
default:
- if (ndisc_is_useropt(nd_opt)) {
+ if (ndisc_is_useropt(dev, nd_opt)) {
ndopts->nd_useropts_end = nd_opt;
if (!ndopts->nd_useropts)
ndopts->nd_useropts = nd_opt;
@@ -479,9 +480,11 @@ static void ndisc_send_skb(struct sk_buff *skb,
rcu_read_unlock();
}
-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)
+static void ip6_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)
{
struct sk_buff *skb;
struct in6_addr tmpaddr;
@@ -555,8 +558,10 @@ 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)
+static void ip6_ndisc_send_ns(struct net_device *dev,
+ const struct in6_addr *solicit,
+ const struct in6_addr *daddr,
+ const struct in6_addr *saddr)
{
struct sk_buff *skb;
struct in6_addr addr_buf;
@@ -702,7 +707,7 @@ static int pndisc_is_router(const void *pkey,
return ret;
}
-static void ndisc_recv_ns(struct sk_buff *skb)
+static void ip6_ndisc_recv_ns(struct sk_buff *skb)
{
struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb);
const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
@@ -738,7 +743,7 @@ static void ndisc_recv_ns(struct sk_buff *skb)
return;
}
- if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) {
+ if (!ndisc_parse_options(dev, msg->opt, ndoptlen, &ndopts)) {
ND_PRINTK(2, warn, "NS: invalid ND options\n");
return;
}
@@ -874,7 +879,7 @@ out:
in6_dev_put(idev);
}
-static void ndisc_recv_na(struct sk_buff *skb)
+static void ip6_ndisc_recv_na(struct sk_buff *skb)
{
struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb);
struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
@@ -912,7 +917,7 @@ static void ndisc_recv_na(struct sk_buff *skb)
idev->cnf.drop_unsolicited_na)
return;
- if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) {
+ if (!ndisc_parse_options(dev, msg->opt, ndoptlen, &ndopts)) {
ND_PRINTK(2, warn, "NS: invalid ND option\n");
return;
}
@@ -1019,7 +1024,7 @@ static void ndisc_recv_rs(struct sk_buff *skb)
goto out;
/* Parse ND options */
- if (!ndisc_parse_options(rs_msg->opt, ndoptlen, &ndopts)) {
+ if (!ndisc_parse_options(skb->dev, rs_msg->opt, ndoptlen, &ndopts)) {
ND_PRINTK(2, notice, "NS: invalid ND option, ignored\n");
goto out;
}
@@ -1137,7 +1142,7 @@ static void ndisc_router_discovery(struct sk_buff *skb)
return;
}
- if (!ndisc_parse_options(opt, optlen, &ndopts)) {
+ if (!ndisc_parse_options(skb->dev, opt, optlen, &ndopts)) {
ND_PRINTK(2, warn, "RA: invalid ND options\n");
return;
}
@@ -1424,7 +1429,8 @@ skip_routeinfo:
struct nd_opt_hdr *p;
for (p = ndopts.nd_useropts;
p;
- p = ndisc_next_useropt(p, ndopts.nd_useropts_end)) {
+ p = ndisc_next_useropt(skb->dev, p,
+ ndopts.nd_useropts_end)) {
ndisc_ra_useropt(skb, p);
}
}
@@ -1462,7 +1468,7 @@ static void ndisc_redirect_rcv(struct sk_buff *skb)
return;
}
- if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts))
+ if (!ndisc_parse_options(skb->dev, msg->opt, ndoptlen, &ndopts))
return;
if (!ndopts.nd_opts_rh) {
@@ -1783,6 +1789,29 @@ int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, void __user *bu
#endif
+static const struct ndisc_ops ip6_ndisc_ops = {
+ .is_useropt = ip6_ndisc_is_useropt,
+ .send_na = ip6_ndisc_send_na,
+ .recv_na = ip6_ndisc_recv_na,
+ .send_ns = ip6_ndisc_send_ns,
+ .recv_ns = ip6_ndisc_recv_ns,
+};
+
+void ip6_register_ndisc_ops(struct net_device *dev)
+{
+ switch (dev->type) {
+ default:
+ if (dev->ndisc_ops) {
+ ND_PRINTK(2, warn,
+ "%s: ndisc_ops already defined for interface type=%d\n",
+ __func__, dev->type);
+ } else {
+ dev->ndisc_ops = &ip6_ndisc_ops;
+ }
+ break;
+ }
+}
+
static int __net_init ndisc_net_init(struct net *net)
{
struct ipv6_pinfo *np;
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index cc180b3..5fa276d 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -2149,7 +2149,7 @@ static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_bu
* first-hop router for the specified ICMP Destination Address.
*/
- if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) {
+ if (!ndisc_parse_options(skb->dev, msg->opt, optlen, &ndopts)) {
net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
return;
}
--
2.8.0
--
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