aboutsummaryrefslogtreecommitdiffstats
path: root/net/ipv6/ndisc.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/ipv6/ndisc.c')
-rw-r--r--net/ipv6/ndisc.c135
1 files changed, 111 insertions, 24 deletions
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 5b596659177c..6cc33dc83d1c 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -15,9 +15,10 @@
/*
* Changes:
*
+ * Pierre Ynard : export userland ND options
+ * through netlink (RDNSS support)
* Lars Fenneberg : fixed MTU setting on receipt
* of an RA.
- *
* Janos Farkas : kmalloc failure checks
* Alexey Kuznetsov : state machine reworked
* and moved to net/core.
@@ -78,6 +79,9 @@
#include <net/addrconf.h>
#include <net/icmp.h>
+#include <net/netlink.h>
+#include <linux/rtnetlink.h>
+
#include <net/flow.h>
#include <net/ip6_checksum.h>
#include <linux/proc_fs.h>
@@ -161,6 +165,8 @@ struct ndisc_options {
struct nd_opt_hdr *nd_opts_ri;
struct nd_opt_hdr *nd_opts_ri_end;
#endif
+ struct nd_opt_hdr *nd_useropts;
+ struct nd_opt_hdr *nd_useropts_end;
};
#define nd_opts_src_lladdr nd_opt_array[ND_OPT_SOURCE_LL_ADDR]
@@ -225,6 +231,22 @@ 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)
+{
+ return (opt->nd_opt_type == ND_OPT_RDNSS);
+}
+
+static struct nd_opt_hdr *ndisc_next_useropt(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);
+}
+
static struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len,
struct ndisc_options *ndopts)
{
@@ -256,7 +278,7 @@ static struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len,
break;
case ND_OPT_PREFIX_INFO:
ndopts->nd_opts_pi_end = nd_opt;
- if (ndopts->nd_opt_array[nd_opt->nd_opt_type] == 0)
+ if (!ndopts->nd_opt_array[nd_opt->nd_opt_type])
ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt;
break;
#ifdef CONFIG_IPV6_ROUTE_INFO
@@ -267,14 +289,21 @@ static struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len,
break;
#endif
default:
- /*
- * Unknown options must be silently ignored,
- * to accommodate future extension to the protocol.
- */
- ND_PRINTK2(KERN_NOTICE
- "%s(): ignored unsupported option; type=%d, len=%d\n",
- __FUNCTION__,
- nd_opt->nd_opt_type, nd_opt->nd_opt_len);
+ if (ndisc_is_useropt(nd_opt)) {
+ ndopts->nd_useropts_end = nd_opt;
+ if (!ndopts->nd_useropts)
+ ndopts->nd_useropts = nd_opt;
+ } else {
+ /*
+ * Unknown options must be silently ignored,
+ * to accommodate future extension to the
+ * protocol.
+ */
+ ND_PRINTK2(KERN_NOTICE
+ "%s(): ignored unsupported option; type=%d, len=%d\n",
+ __FUNCTION__,
+ nd_opt->nd_opt_type, nd_opt->nd_opt_len);
+ }
}
opt_len -= l;
nd_opt = ((void *)nd_opt) + l;
@@ -354,7 +383,7 @@ static int ndisc_constructor(struct neighbour *neigh)
rcu_read_unlock();
neigh->type = is_multicast ? RTN_MULTICAST : RTN_UNICAST;
- if (dev->hard_header == NULL) {
+ if (!dev->header_ops) {
neigh->nud_state = NUD_NOARP;
neigh->ops = &ndisc_direct_ops;
neigh->output = neigh->ops->queue_xmit;
@@ -371,7 +400,7 @@ static int ndisc_constructor(struct neighbour *neigh)
neigh->nud_state = NUD_NOARP;
memcpy(neigh->ha, dev->broadcast, dev->addr_len);
}
- if (dev->hard_header_cache)
+ if (dev->header_ops->cache)
neigh->ops = &ndisc_hh_ops;
else
neigh->ops = &ndisc_generic_ops;
@@ -431,7 +460,7 @@ static void __ndisc_send(struct net_device *dev,
struct neighbour *neigh,
struct in6_addr *daddr, struct in6_addr *saddr,
struct icmp6hdr *icmp6h, struct in6_addr *target,
- int llinfo, int icmp6_mib_outnd)
+ int llinfo)
{
struct flowi fl;
struct dst_entry *dst;
@@ -441,9 +470,11 @@ static void __ndisc_send(struct net_device *dev,
struct inet6_dev *idev;
int len;
int err;
- u8 *opt;
+ u8 *opt, type;
+
+ type = icmp6h->icmp6_type;
- ndisc_flow_init(&fl, icmp6h->icmp6_type, saddr, daddr,
+ ndisc_flow_init(&fl, type, saddr, daddr,
dev->ifindex);
dst = ndisc_dst_alloc(dev, neigh, daddr, ip6_output);
@@ -504,7 +535,7 @@ static void __ndisc_send(struct net_device *dev,
err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, dst->dev, dst_output);
if (!err) {
- ICMP6_INC_STATS(idev, icmp6_mib_outnd);
+ ICMP6MSGOUT_INC_STATS(idev, type);
ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
}
@@ -542,8 +573,7 @@ static void ndisc_send_na(struct net_device *dev, struct neighbour *neigh,
__ndisc_send(dev, neigh, daddr, src_addr,
&icmp6h, solicited_addr,
- inc_opt ? ND_OPT_TARGET_LL_ADDR : 0,
- ICMP6_MIB_OUTNEIGHBORADVERTISEMENTS);
+ inc_opt ? ND_OPT_TARGET_LL_ADDR : 0);
}
void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh,
@@ -564,8 +594,7 @@ void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh,
__ndisc_send(dev, neigh, daddr, saddr,
&icmp6h, solicit,
- !ipv6_addr_any(saddr) ? ND_OPT_SOURCE_LL_ADDR : 0,
- ICMP6_MIB_OUTNEIGHBORSOLICITS);
+ !ipv6_addr_any(saddr) ? ND_OPT_SOURCE_LL_ADDR : 0);
}
void ndisc_send_rs(struct net_device *dev, struct in6_addr *saddr,
@@ -599,8 +628,7 @@ void ndisc_send_rs(struct net_device *dev, struct in6_addr *saddr,
#endif
__ndisc_send(dev, NULL, daddr, saddr,
&icmp6h, NULL,
- send_sllao ? ND_OPT_SOURCE_LL_ADDR : 0,
- ICMP6_MIB_OUTROUTERSOLICITS);
+ send_sllao ? ND_OPT_SOURCE_LL_ADDR : 0);
}
@@ -808,7 +836,7 @@ static void ndisc_recv_ns(struct sk_buff *skb)
neigh_update(neigh, lladdr, NUD_STALE,
NEIGH_UPDATE_F_WEAK_OVERRIDE|
NEIGH_UPDATE_F_OVERRIDE);
- if (neigh || !dev->hard_header) {
+ if (neigh || !dev->header_ops) {
ndisc_send_na(dev, neigh, saddr, &msg->target,
is_router,
1, (ifp != NULL && inc), inc);
@@ -985,6 +1013,53 @@ out:
in6_dev_put(idev);
}
+static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt)
+{
+ struct icmp6hdr *icmp6h = (struct icmp6hdr *)skb_transport_header(ra);
+ struct sk_buff *skb;
+ struct nlmsghdr *nlh;
+ struct nduseroptmsg *ndmsg;
+ int err;
+ int base_size = NLMSG_ALIGN(sizeof(struct nduseroptmsg)
+ + (opt->nd_opt_len << 3));
+ size_t msg_size = base_size + nla_total_size(sizeof(struct in6_addr));
+
+ skb = nlmsg_new(msg_size, GFP_ATOMIC);
+ if (skb == NULL) {
+ err = -ENOBUFS;
+ goto errout;
+ }
+
+ nlh = nlmsg_put(skb, 0, 0, RTM_NEWNDUSEROPT, base_size, 0);
+ if (nlh == NULL) {
+ goto nla_put_failure;
+ }
+
+ ndmsg = nlmsg_data(nlh);
+ ndmsg->nduseropt_family = AF_INET6;
+ ndmsg->nduseropt_icmp_type = icmp6h->icmp6_type;
+ ndmsg->nduseropt_icmp_code = icmp6h->icmp6_code;
+ ndmsg->nduseropt_opts_len = opt->nd_opt_len << 3;
+
+ memcpy(ndmsg + 1, opt, opt->nd_opt_len << 3);
+
+ NLA_PUT(skb, NDUSEROPT_SRCADDR, sizeof(struct in6_addr),
+ &ipv6_hdr(ra)->saddr);
+ nlmsg_end(skb, nlh);
+
+ err = rtnl_notify(skb, 0, RTNLGRP_ND_USEROPT, NULL, GFP_ATOMIC);
+ if (err < 0)
+ goto errout;
+
+ return;
+
+nla_put_failure:
+ nlmsg_free(skb);
+ err = -EMSGSIZE;
+errout:
+ rtnl_set_sk_err(RTNLGRP_ND_USEROPT, err);
+}
+
static void ndisc_router_discovery(struct sk_buff *skb)
{
struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb);
@@ -1217,6 +1292,15 @@ skip_defrtr:
}
}
+ if (ndopts.nd_useropts) {
+ struct nd_opt_hdr *opt;
+ for (opt = ndopts.nd_useropts;
+ opt;
+ opt = ndisc_next_useropt(opt, ndopts.nd_useropts_end)) {
+ ndisc_ra_useropt(skb, opt);
+ }
+ }
+
if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) {
ND_PRINTK2(KERN_WARNING
"ICMPv6 RA: invalid RA options");
@@ -1455,7 +1539,7 @@ void ndisc_send_redirect(struct sk_buff *skb, struct neighbour *neigh,
IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS);
err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, buff, NULL, dst->dev, dst_output);
if (!err) {
- ICMP6_INC_STATS(idev, ICMP6_MIB_OUTREDIRECTS);
+ ICMP6MSGOUT_INC_STATS(idev, NDISC_REDIRECT);
ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
}
@@ -1525,6 +1609,9 @@ static int ndisc_netdev_event(struct notifier_block *this, unsigned long event,
{
struct net_device *dev = ptr;
+ if (dev->nd_net != &init_net)
+ return NOTIFY_DONE;
+
switch (event) {
case NETDEV_CHANGEADDR:
neigh_changeaddr(&nd_tbl, dev);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.