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Diffstat (limited to 'net/ipv6/ndisc.c')
-rw-r--r--net/ipv6/ndisc.c237
1 files changed, 145 insertions, 92 deletions
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 452a2ac4eec8..2c74885f8355 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -84,13 +84,12 @@
#include <net/flow.h>
#include <net/ip6_checksum.h>
+#include <net/inet_common.h>
#include <linux/proc_fs.h>
#include <linux/netfilter.h>
#include <linux/netfilter_ipv6.h>
-static struct socket *ndisc_socket;
-
static u32 ndisc_hash(const void *pkey, const struct net_device *dev);
static int ndisc_constructor(struct neighbour *neigh);
static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb);
@@ -270,7 +269,7 @@ static struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len,
if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) {
ND_PRINTK2(KERN_WARNING
"%s(): duplicated ND6 option found: type=%d\n",
- __FUNCTION__,
+ __func__,
nd_opt->nd_opt_type);
} else {
ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt;
@@ -301,7 +300,7 @@ static struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len,
*/
ND_PRINTK2(KERN_NOTICE
"%s(): ignored unsupported option; type=%d, len=%d\n",
- __FUNCTION__,
+ __func__,
nd_opt->nd_opt_type, nd_opt->nd_opt_len);
}
}
@@ -441,30 +440,17 @@ static void pndisc_destructor(struct pneigh_entry *n)
/*
* Send a Neighbour Advertisement
*/
-
-static inline void ndisc_flow_init(struct flowi *fl, u8 type,
- struct in6_addr *saddr, struct in6_addr *daddr,
- int oif)
-{
- memset(fl, 0, sizeof(*fl));
- ipv6_addr_copy(&fl->fl6_src, saddr);
- ipv6_addr_copy(&fl->fl6_dst, daddr);
- fl->proto = IPPROTO_ICMPV6;
- fl->fl_icmp_type = type;
- fl->fl_icmp_code = 0;
- fl->oif = oif;
- security_sk_classify_flow(ndisc_socket->sk, fl);
-}
-
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,
+ const struct in6_addr *daddr,
+ const struct in6_addr *saddr,
+ struct icmp6hdr *icmp6h, const struct in6_addr *target,
int llinfo)
{
struct flowi fl;
struct dst_entry *dst;
- struct sock *sk = ndisc_socket->sk;
+ struct net *net = dev_net(dev);
+ struct sock *sk = net->ipv6.ndisc_sk;
struct sk_buff *skb;
struct icmp6hdr *hdr;
struct inet6_dev *idev;
@@ -474,10 +460,9 @@ static void __ndisc_send(struct net_device *dev,
type = icmp6h->icmp6_type;
- ndisc_flow_init(&fl, type, saddr, daddr,
- dev->ifindex);
+ icmpv6_flow_init(sk, &fl, type, saddr, daddr, dev->ifindex);
- dst = ndisc_dst_alloc(dev, neigh, daddr, ip6_output);
+ dst = icmp6_dst_alloc(dev, neigh, daddr);
if (!dst)
return;
@@ -499,7 +484,7 @@ static void __ndisc_send(struct net_device *dev,
if (!skb) {
ND_PRINTK0(KERN_ERR
"ICMPv6 ND: %s() failed to allocate an skb.\n",
- __FUNCTION__);
+ __func__);
dst_release(dst);
return;
}
@@ -545,25 +530,28 @@ static void __ndisc_send(struct net_device *dev,
}
static void ndisc_send_na(struct net_device *dev, struct neighbour *neigh,
- struct in6_addr *daddr, struct in6_addr *solicited_addr,
- int router, int solicited, int override, int inc_opt)
+ const struct in6_addr *daddr,
+ const struct in6_addr *solicited_addr,
+ int router, int solicited, int override, int inc_opt)
{
struct in6_addr tmpaddr;
struct inet6_ifaddr *ifp;
- struct in6_addr *src_addr;
+ const struct in6_addr *src_addr;
struct icmp6hdr icmp6h = {
.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT,
};
/* for anycast or proxy, solicited_addr != src_addr */
- ifp = ipv6_get_ifaddr(&init_net, solicited_addr, dev, 1);
+ ifp = ipv6_get_ifaddr(dev_net(dev), solicited_addr, dev, 1);
if (ifp) {
src_addr = solicited_addr;
if (ifp->flags & IFA_F_OPTIMISTIC)
override = 0;
in6_ifa_put(ifp);
} else {
- if (ipv6_dev_get_saddr(dev, daddr, &tmpaddr))
+ if (ipv6_dev_get_saddr(dev, daddr,
+ inet6_sk(dev_net(dev)->ipv6.ndisc_sk)->srcprefs,
+ &tmpaddr))
return;
src_addr = &tmpaddr;
}
@@ -578,8 +566,8 @@ static void ndisc_send_na(struct net_device *dev, struct neighbour *neigh,
}
void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh,
- struct in6_addr *solicit,
- struct in6_addr *daddr, struct in6_addr *saddr)
+ const struct in6_addr *solicit,
+ const struct in6_addr *daddr, const struct in6_addr *saddr)
{
struct in6_addr addr_buf;
struct icmp6hdr icmp6h = {
@@ -598,8 +586,8 @@ void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh,
!ipv6_addr_any(saddr) ? ND_OPT_SOURCE_LL_ADDR : 0);
}
-void ndisc_send_rs(struct net_device *dev, struct in6_addr *saddr,
- struct in6_addr *daddr)
+void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr,
+ const struct in6_addr *daddr)
{
struct icmp6hdr icmp6h = {
.icmp6_type = NDISC_ROUTER_SOLICITATION,
@@ -616,7 +604,7 @@ void ndisc_send_rs(struct net_device *dev, struct in6_addr *saddr,
* suppress the inclusion of the sllao.
*/
if (send_sllao) {
- struct inet6_ifaddr *ifp = ipv6_get_ifaddr(&init_net, saddr,
+ struct inet6_ifaddr *ifp = ipv6_get_ifaddr(dev_net(dev), saddr,
dev, 1);
if (ifp) {
if (ifp->flags & IFA_F_OPTIMISTIC) {
@@ -654,7 +642,7 @@ static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb)
struct in6_addr *target = (struct in6_addr *)&neigh->primary_key;
int probes = atomic_read(&neigh->probes);
- if (skb && ipv6_chk_addr(&init_net, &ipv6_hdr(skb)->saddr, dev, 1))
+ if (skb && ipv6_chk_addr(dev_net(dev), &ipv6_hdr(skb)->saddr, dev, 1))
saddr = &ipv6_hdr(skb)->saddr;
if ((probes -= neigh->parms->ucast_probes) < 0) {
@@ -662,7 +650,7 @@ static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb)
ND_PRINTK1(KERN_DEBUG
"%s(): trying to ucast probe in NUD_INVALID: "
NIP6_FMT "\n",
- __FUNCTION__,
+ __func__,
NIP6(*target));
}
ndisc_send_ns(dev, neigh, target, target, saddr);
@@ -676,18 +664,19 @@ static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb)
}
}
-static struct pneigh_entry *pndisc_check_router(struct net_device *dev,
- struct in6_addr *addr, int *is_router)
+static int pndisc_is_router(const void *pkey,
+ struct net_device *dev)
{
struct pneigh_entry *n;
+ int ret = -1;
read_lock_bh(&nd_tbl.lock);
- n = __pneigh_lookup(&nd_tbl, &init_net, addr, dev);
- if (n != NULL)
- *is_router = (n->flags & NTF_ROUTER);
+ n = __pneigh_lookup(&nd_tbl, dev_net(dev), pkey, dev);
+ if (n)
+ ret = !!(n->flags & NTF_ROUTER);
read_unlock_bh(&nd_tbl.lock);
- return n;
+ return ret;
}
static void ndisc_recv_ns(struct sk_buff *skb)
@@ -703,10 +692,9 @@ static void ndisc_recv_ns(struct sk_buff *skb)
struct inet6_ifaddr *ifp;
struct inet6_dev *idev = NULL;
struct neighbour *neigh;
- struct pneigh_entry *pneigh = NULL;
int dad = ipv6_addr_any(saddr);
int inc;
- int is_router = 0;
+ int is_router = -1;
if (ipv6_addr_is_multicast(&msg->target)) {
ND_PRINTK2(KERN_WARNING
@@ -756,7 +744,8 @@ static void ndisc_recv_ns(struct sk_buff *skb)
inc = ipv6_addr_is_multicast(daddr);
- if ((ifp = ipv6_get_ifaddr(&init_net, &msg->target, dev, 1)) != NULL) {
+ ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1);
+ if (ifp) {
if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) {
if (dad) {
@@ -801,11 +790,10 @@ static void ndisc_recv_ns(struct sk_buff *skb)
return;
}
- if (ipv6_chk_acast_addr(dev, &msg->target) ||
+ if (ipv6_chk_acast_addr(dev_net(dev), dev, &msg->target) ||
(idev->cnf.forwarding &&
(ipv6_devconf.proxy_ndp || idev->cnf.proxy_ndp) &&
- (pneigh = pndisc_check_router(dev, &msg->target,
- &is_router)) != NULL)) {
+ (is_router = pndisc_is_router(&msg->target, dev)) >= 0)) {
if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) &&
skb->pkt_type != PACKET_HOST &&
inc != 0 &&
@@ -826,13 +814,11 @@ static void ndisc_recv_ns(struct sk_buff *skb)
goto out;
}
- is_router = !!(pneigh ? is_router : idev->cnf.forwarding);
+ if (is_router < 0)
+ is_router = !!idev->cnf.forwarding;
if (dad) {
- struct in6_addr maddr;
-
- ipv6_addr_all_nodes(&maddr);
- ndisc_send_na(dev, NULL, &maddr, &msg->target,
+ ndisc_send_na(dev, NULL, &in6addr_linklocal_allnodes, &msg->target,
is_router, 0, (ifp != NULL), 1);
goto out;
}
@@ -914,7 +900,8 @@ static void ndisc_recv_na(struct sk_buff *skb)
return;
}
}
- if ((ifp = ipv6_get_ifaddr(&init_net, &msg->target, dev, 1))) {
+ ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1);
+ if (ifp) {
if (ifp->flags & IFA_F_TENTATIVE) {
addrconf_dad_failure(ifp);
return;
@@ -945,7 +932,7 @@ static void ndisc_recv_na(struct sk_buff *skb)
*/
if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) &&
ipv6_devconf.forwarding && ipv6_devconf.proxy_ndp &&
- pneigh_lookup(&nd_tbl, &init_net, &msg->target, dev, 0)) {
+ pneigh_lookup(&nd_tbl, dev_net(dev), &msg->target, dev, 0)) {
/* XXX: idev->cnf.prixy_ndp */
goto out;
}
@@ -1035,6 +1022,7 @@ static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt)
struct sk_buff *skb;
struct nlmsghdr *nlh;
struct nduseroptmsg *ndmsg;
+ struct net *net = dev_net(ra->dev);
int err;
int base_size = NLMSG_ALIGN(sizeof(struct nduseroptmsg)
+ (opt->nd_opt_len << 3));
@@ -1064,7 +1052,7 @@ static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt)
&ipv6_hdr(ra)->saddr);
nlmsg_end(skb, nlh);
- err = rtnl_notify(skb, &init_net, 0, RTNLGRP_ND_USEROPT, NULL,
+ err = rtnl_notify(skb, net, 0, RTNLGRP_ND_USEROPT, NULL,
GFP_ATOMIC);
if (err < 0)
goto errout;
@@ -1075,7 +1063,7 @@ nla_put_failure:
nlmsg_free(skb);
err = -EMSGSIZE;
errout:
- rtnl_set_sk_err(&init_net, RTNLGRP_ND_USEROPT, err);
+ rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err);
}
static void ndisc_router_discovery(struct sk_buff *skb)
@@ -1104,6 +1092,14 @@ static void ndisc_router_discovery(struct sk_buff *skb)
return;
}
+#ifdef CONFIG_IPV6_NDISC_NODETYPE
+ if (skb->ndisc_nodetype == NDISC_NODETYPE_HOST) {
+ ND_PRINTK2(KERN_WARNING
+ "ICMPv6 RA: from host or unauthorized router\n");
+ return;
+ }
+#endif
+
/*
* set the RA_RECV flag in the interface
*/
@@ -1127,6 +1123,12 @@ static void ndisc_router_discovery(struct sk_buff *skb)
return;
}
+#ifdef CONFIG_IPV6_NDISC_NODETYPE
+ /* skip link-specific parameters from interior routers */
+ if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT)
+ goto skip_linkparms;
+#endif
+
if (in6_dev->if_flags & IF_RS_SENT) {
/*
* flag that an RA was received after an RS was sent
@@ -1178,7 +1180,7 @@ static void ndisc_router_discovery(struct sk_buff *skb)
if (rt == NULL) {
ND_PRINTK0(KERN_ERR
"ICMPv6 RA: %s() failed to add default route.\n",
- __FUNCTION__);
+ __func__);
in6_dev_put(in6_dev);
return;
}
@@ -1187,7 +1189,7 @@ static void ndisc_router_discovery(struct sk_buff *skb)
if (neigh == NULL) {
ND_PRINTK0(KERN_ERR
"ICMPv6 RA: %s() got default router without neighbour.\n",
- __FUNCTION__);
+ __func__);
dst_release(&rt->u.dst);
in6_dev_put(in6_dev);
return;
@@ -1241,6 +1243,10 @@ skip_defrtr:
}
}
+#ifdef CONFIG_IPV6_NDISC_NODETYPE
+skip_linkparms:
+#endif
+
/*
* Process options.
*/
@@ -1272,7 +1278,13 @@ skip_defrtr:
for (p = ndopts.nd_opts_ri;
p;
p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) {
- if (((struct route_info *)p)->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen)
+ struct route_info *ri = (struct route_info *)p;
+#ifdef CONFIG_IPV6_NDISC_NODETYPE
+ if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT &&
+ ri->prefix_len == 0)
+ continue;
+#endif
+ if (ri->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen)
continue;
rt6_route_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3,
&ipv6_hdr(skb)->saddr);
@@ -1280,6 +1292,12 @@ skip_defrtr:
}
#endif
+#ifdef CONFIG_IPV6_NDISC_NODETYPE
+ /* skip link-specific ndopts from interior routers */
+ if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT)
+ goto out;
+#endif
+
if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) {
struct nd_opt_hdr *p;
for (p = ndopts.nd_opts_pi;
@@ -1343,6 +1361,16 @@ static void ndisc_redirect_rcv(struct sk_buff *skb)
int optlen;
u8 *lladdr = NULL;
+#ifdef CONFIG_IPV6_NDISC_NODETYPE
+ switch (skb->ndisc_nodetype) {
+ case NDISC_NODETYPE_HOST:
+ case NDISC_NODETYPE_NODEFAULT:
+ ND_PRINTK2(KERN_WARNING
+ "ICMPv6 Redirect: from host or unauthorized router\n");
+ return;
+ }
+#endif
+
if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) {
ND_PRINTK2(KERN_WARNING
"ICMPv6 Redirect: source address is not link-local.\n");
@@ -1418,15 +1446,16 @@ static void ndisc_redirect_rcv(struct sk_buff *skb)
}
void ndisc_send_redirect(struct sk_buff *skb, struct neighbour *neigh,
- struct in6_addr *target)
+ const struct in6_addr *target)
{
- struct sock *sk = ndisc_socket->sk;
+ struct net_device *dev = skb->dev;
+ struct net *net = dev_net(dev);
+ struct sock *sk = net->ipv6.ndisc_sk;
int len = sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr);
struct sk_buff *buff;
struct icmp6hdr *icmph;
struct in6_addr saddr_buf;
struct in6_addr *addrp;
- struct net_device *dev;
struct rt6_info *rt;
struct dst_entry *dst;
struct inet6_dev *idev;
@@ -1436,8 +1465,6 @@ void ndisc_send_redirect(struct sk_buff *skb, struct neighbour *neigh,
int err;
u8 ha_buf[MAX_ADDR_LEN], *ha = NULL;
- dev = skb->dev;
-
if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) {
ND_PRINTK2(KERN_WARNING
"ICMPv6 Redirect: no link-local address on %s\n",
@@ -1452,10 +1479,10 @@ void ndisc_send_redirect(struct sk_buff *skb, struct neighbour *neigh,
return;
}
- ndisc_flow_init(&fl, NDISC_REDIRECT, &saddr_buf, &ipv6_hdr(skb)->saddr,
- dev->ifindex);
+ icmpv6_flow_init(sk, &fl, NDISC_REDIRECT,
+ &saddr_buf, &ipv6_hdr(skb)->saddr, dev->ifindex);
- dst = ip6_route_output(NULL, &fl);
+ dst = ip6_route_output(net, NULL, &fl);
if (dst == NULL)
return;
@@ -1499,12 +1526,11 @@ void ndisc_send_redirect(struct sk_buff *skb, struct neighbour *neigh,
if (buff == NULL) {
ND_PRINTK0(KERN_ERR
"ICMPv6 Redirect: %s() failed to allocate an skb.\n",
- __FUNCTION__);
+ __func__);
dst_release(dst);
return;
}
-
skb_reserve(buff, LL_RESERVED_SPACE(dev));
ip6_nd_hdr(sk, buff, dev, &saddr_buf, &ipv6_hdr(skb)->saddr,
IPPROTO_ICMPV6, len);
@@ -1625,18 +1651,16 @@ int ndisc_rcv(struct sk_buff *skb)
static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
{
struct net_device *dev = ptr;
-
- if (dev->nd_net != &init_net)
- return NOTIFY_DONE;
+ struct net *net = dev_net(dev);
switch (event) {
case NETDEV_CHANGEADDR:
neigh_changeaddr(&nd_tbl, dev);
- fib6_run_gc(~0UL);
+ fib6_run_gc(~0UL, net);
break;
case NETDEV_DOWN:
neigh_ifdown(&nd_tbl, dev);
- fib6_run_gc(~0UL);
+ fib6_run_gc(~0UL, net);
break;
default:
break;
@@ -1745,44 +1769,74 @@ static int ndisc_ifinfo_sysctl_strategy(ctl_table *ctl, int __user *name,
#endif
-int __init ndisc_init(struct net_proto_family *ops)
+static int ndisc_net_init(struct net *net)
{
struct ipv6_pinfo *np;
struct sock *sk;
int err;
- err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &ndisc_socket);
+ err = inet_ctl_sock_create(&sk, PF_INET6,
+ SOCK_RAW, IPPROTO_ICMPV6, net);
if (err < 0) {
ND_PRINTK0(KERN_ERR
"ICMPv6 NDISC: Failed to initialize the control socket (err %d).\n",
err);
- ndisc_socket = NULL; /* For safety. */
return err;
}
- sk = ndisc_socket->sk;
+ net->ipv6.ndisc_sk = sk;
+
np = inet6_sk(sk);
- sk->sk_allocation = GFP_ATOMIC;
np->hop_limit = 255;
/* Do not loopback ndisc messages */
np->mc_loop = 0;
- sk->sk_prot->unhash(sk);
+ return 0;
+}
+
+static void ndisc_net_exit(struct net *net)
+{
+ inet_ctl_sock_destroy(net->ipv6.ndisc_sk);
+}
+
+static struct pernet_operations ndisc_net_ops = {
+ .init = ndisc_net_init,
+ .exit = ndisc_net_exit,
+};
+
+int __init ndisc_init(void)
+{
+ int err;
+
+ err = register_pernet_subsys(&ndisc_net_ops);
+ if (err)
+ return err;
/*
* Initialize the neighbour table
*/
-
neigh_table_init(&nd_tbl);
#ifdef CONFIG_SYSCTL
- neigh_sysctl_register(NULL, &nd_tbl.parms, NET_IPV6, NET_IPV6_NEIGH,
- "ipv6",
- &ndisc_ifinfo_sysctl_change,
- &ndisc_ifinfo_sysctl_strategy);
+ err = neigh_sysctl_register(NULL, &nd_tbl.parms, NET_IPV6,
+ NET_IPV6_NEIGH, "ipv6",
+ &ndisc_ifinfo_sysctl_change,
+ &ndisc_ifinfo_sysctl_strategy);
+ if (err)
+ goto out_unregister_pernet;
#endif
+ err = register_netdevice_notifier(&ndisc_netdev_notifier);
+ if (err)
+ goto out_unregister_sysctl;
+out:
+ return err;
- register_netdevice_notifier(&ndisc_netdev_notifier);
- return 0;
+out_unregister_sysctl:
+#ifdef CONFIG_SYSCTL
+ neigh_sysctl_unregister(&nd_tbl.parms);
+out_unregister_pernet:
+#endif
+ unregister_pernet_subsys(&ndisc_net_ops);
+ goto out;
}
void ndisc_cleanup(void)
@@ -1792,6 +1846,5 @@ void ndisc_cleanup(void)
neigh_sysctl_unregister(&nd_tbl.parms);
#endif
neigh_table_clear(&nd_tbl);
- sock_release(ndisc_socket);
- ndisc_socket = NULL; /* For safety. */
+ unregister_pernet_subsys(&ndisc_net_ops);
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.