net, neigh: Extend neigh->flags to 32 bit to allow for extensions

Currently, all bits in struct ndmsg's ndm_flags are used up with the most
recent addition of 435f2e7cc0b7 ("net: bridge: add support for sticky fdb
entries"). This makes it impossible to extend the neighboring subsystem
with new NTF_* flags:

  struct ndmsg {
    __u8   ndm_family;
    __u8   ndm_pad1;
    __u16  ndm_pad2;
    __s32  ndm_ifindex;
    __u16  ndm_state;
    __u8   ndm_flags;
    __u8   ndm_type;
  };

There are ndm_pad{1,2} attributes which are not used. However, due to
uncareful design, the kernel does not enforce them to be zero upon new
neighbor entry addition, and given they've been around forever, it is
not possible to reuse them today due to risk of breakage. One option to
overcome this limitation is to add a new NDA_FLAGS_EXT attribute for
extended flags.

In struct neighbour, there is a 3 byte hole between protocol and ha_lock,
which allows neigh->flags to be extended from 8 to 32 bits while still
being on the same cacheline as before. This also allows for all future
NTF_* flags being in neigh->flags rather than yet another flags field.
Unknown flags in NDA_FLAGS_EXT will be rejected by the kernel.

Co-developed-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Roopa Prabhu <roopa@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 40 insertions, 15 deletions

diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index 3e58037a8ae6..5245e888c981 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -159,7 +159,7 @@ static bool neigh_update_ext_learned(struct neighbour *neigh, u32 flags,
 				     int *notify)
 {
 	bool rc = false;
-	u8 ndm_flags;
+	u32 ndm_flags;
 
 	if (!(flags & NEIGH_UPDATE_F_ADMIN))
 		return rc;
@@ -379,7 +379,7 @@ EXPORT_SYMBOL(neigh_ifdown);
 
 static struct neighbour *neigh_alloc(struct neigh_table *tbl,
 				     struct net_device *dev,
-				     u8 flags, bool exempt_from_gc)
+				     u32 flags, bool exempt_from_gc)
 {
 	struct neighbour *n = NULL;
 	unsigned long now = jiffies;
@@ -578,7 +578,7 @@ EXPORT_SYMBOL(neigh_lookup_nodev);
 
 static struct neighbour *
 ___neigh_create(struct neigh_table *tbl, const void *pkey,
-		struct net_device *dev, u8 flags,
+		struct net_device *dev, u32 flags,
 		bool exempt_from_gc, bool want_ref)
 {
 	u32 hash_val, key_len = tbl->key_len;
@@ -1789,6 +1789,7 @@ const struct nla_policy nda_policy[NDA_MAX+1] = {
 	[NDA_MASTER]		= { .type = NLA_U32 },
 	[NDA_PROTOCOL]		= { .type = NLA_U8 },
 	[NDA_NH_ID]		= { .type = NLA_U32 },
+	[NDA_FLAGS_EXT]		= { .type = NLA_U32 },
 	[NDA_FDB_EXT_ATTRS]	= { .type = NLA_NESTED },
 };
 
@@ -1861,7 +1862,7 @@ static int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh,
 		     struct netlink_ext_ack *extack)
 {
 	int flags = NEIGH_UPDATE_F_ADMIN | NEIGH_UPDATE_F_OVERRIDE |
-		NEIGH_UPDATE_F_OVERRIDE_ISROUTER;
+		    NEIGH_UPDATE_F_OVERRIDE_ISROUTER;
 	struct net *net = sock_net(skb->sk);
 	struct ndmsg *ndm;
 	struct nlattr *tb[NDA_MAX+1];
@@ -1870,6 +1871,7 @@ static int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh,
 	struct neighbour *neigh;
 	void *dst, *lladdr;
 	u8 protocol = 0;
+	u32 ndm_flags;
 	int err;
 
 	ASSERT_RTNL();
@@ -1885,6 +1887,16 @@ static int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh,
 	}
 
 	ndm = nlmsg_data(nlh);
+	ndm_flags = ndm->ndm_flags;
+	if (tb[NDA_FLAGS_EXT]) {
+		u32 ext = nla_get_u32(tb[NDA_FLAGS_EXT]);
+
+		if (ext & ~0) {
+			NL_SET_ERR_MSG(extack, "Invalid extended flags");
+			goto out;
+		}
+		ndm_flags |= (ext << NTF_EXT_SHIFT);
+	}
 	if (ndm->ndm_ifindex) {
 		dev = __dev_get_by_index(net, ndm->ndm_ifindex);
 		if (dev == NULL) {
@@ -1912,14 +1924,13 @@ static int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh,
 
 	if (tb[NDA_PROTOCOL])
 		protocol = nla_get_u8(tb[NDA_PROTOCOL]);
-
-	if (ndm->ndm_flags & NTF_PROXY) {
+	if (ndm_flags & NTF_PROXY) {
 		struct pneigh_entry *pn;
 
 		err = -ENOBUFS;
 		pn = pneigh_lookup(tbl, net, dst, dev, 1);
 		if (pn) {
-			pn->flags = ndm->ndm_flags;
+			pn->flags = ndm_flags;
 			if (protocol)
 				pn->protocol = protocol;
 			err = 0;
@@ -1947,9 +1958,9 @@ static int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh,
 		}
 
 		exempt_from_gc = ndm->ndm_state & NUD_PERMANENT ||
-				 ndm->ndm_flags & NTF_EXT_LEARNED;
+				 ndm_flags & NTF_EXT_LEARNED;
 		neigh = ___neigh_create(tbl, dst, dev,
-					ndm->ndm_flags & NTF_EXT_LEARNED,
+					ndm_flags & NTF_EXT_LEARNED,
 					exempt_from_gc, true);
 		if (IS_ERR(neigh)) {
 			err = PTR_ERR(neigh);
@@ -1969,16 +1980,16 @@ static int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh,
 
 	if (protocol)
 		neigh->protocol = protocol;
-	if (ndm->ndm_flags & NTF_EXT_LEARNED)
+	if (ndm_flags & NTF_EXT_LEARNED)
 		flags |= NEIGH_UPDATE_F_EXT_LEARNED;
-	if (ndm->ndm_flags & NTF_ROUTER)
+	if (ndm_flags & NTF_ROUTER)
 		flags |= NEIGH_UPDATE_F_ISROUTER;
-	if (ndm->ndm_flags & NTF_USE)
+	if (ndm_flags & NTF_USE)
 		flags |= NEIGH_UPDATE_F_USE;
 
 	err = __neigh_update(neigh, lladdr, ndm->ndm_state, flags,
 			     NETLINK_CB(skb).portid, extack);
-	if (!err && ndm->ndm_flags & NTF_USE) {
+	if (!err && ndm_flags & NTF_USE) {
 		neigh_event_send(neigh, NULL);
 		err = 0;
 	}
@@ -2433,6 +2444,7 @@ out:
 static int neigh_fill_info(struct sk_buff *skb, struct neighbour *neigh,
 			   u32 pid, u32 seq, int type, unsigned int flags)
 {
+	u32 neigh_flags, neigh_flags_ext;
 	unsigned long now = jiffies;
 	struct nda_cacheinfo ci;
 	struct nlmsghdr *nlh;
@@ -2442,11 +2454,14 @@ static int neigh_fill_info(struct sk_buff *skb, struct neighbour *neigh,
 	if (nlh == NULL)
 		return -EMSGSIZE;
 
+	neigh_flags_ext = neigh->flags >> NTF_EXT_SHIFT;
+	neigh_flags     = neigh->flags & NTF_OLD_MASK;
+
 	ndm = nlmsg_data(nlh);
 	ndm->ndm_family	 = neigh->ops->family;
 	ndm->ndm_pad1    = 0;
 	ndm->ndm_pad2    = 0;
-	ndm->ndm_flags	 = neigh->flags;
+	ndm->ndm_flags	 = neigh_flags;
 	ndm->ndm_type	 = neigh->type;
 	ndm->ndm_ifindex = neigh->dev->ifindex;
 
@@ -2477,6 +2492,8 @@ static int neigh_fill_info(struct sk_buff *skb, struct neighbour *neigh,
 
 	if (neigh->protocol && nla_put_u8(skb, NDA_PROTOCOL, neigh->protocol))
 		goto nla_put_failure;
+	if (neigh_flags_ext && nla_put_u32(skb, NDA_FLAGS_EXT, neigh_flags_ext))
+		goto nla_put_failure;
 
 	nlmsg_end(skb, nlh);
 	return 0;
@@ -2490,6 +2507,7 @@ static int pneigh_fill_info(struct sk_buff *skb, struct pneigh_entry *pn,
 			    u32 pid, u32 seq, int type, unsigned int flags,
 			    struct neigh_table *tbl)
 {
+	u32 neigh_flags, neigh_flags_ext;
 	struct nlmsghdr *nlh;
 	struct ndmsg *ndm;
 
@@ -2497,11 +2515,14 @@ static int pneigh_fill_info(struct sk_buff *skb, struct pneigh_entry *pn,
 	if (nlh == NULL)
 		return -EMSGSIZE;
 
+	neigh_flags_ext = pn->flags >> NTF_EXT_SHIFT;
+	neigh_flags     = pn->flags & NTF_OLD_MASK;
+
 	ndm = nlmsg_data(nlh);
 	ndm->ndm_family	 = tbl->family;
 	ndm->ndm_pad1    = 0;
 	ndm->ndm_pad2    = 0;
-	ndm->ndm_flags	 = pn->flags | NTF_PROXY;
+	ndm->ndm_flags	 = neigh_flags | NTF_PROXY;
 	ndm->ndm_type	 = RTN_UNICAST;
 	ndm->ndm_ifindex = pn->dev ? pn->dev->ifindex : 0;
 	ndm->ndm_state	 = NUD_NONE;
@@ -2511,6 +2532,8 @@ static int pneigh_fill_info(struct sk_buff *skb, struct pneigh_entry *pn,
 
 	if (pn->protocol && nla_put_u8(skb, NDA_PROTOCOL, pn->protocol))
 		goto nla_put_failure;
+	if (neigh_flags_ext && nla_put_u32(skb, NDA_FLAGS_EXT, neigh_flags_ext))
+		goto nla_put_failure;
 
 	nlmsg_end(skb, nlh);
 	return 0;
@@ -2826,6 +2849,7 @@ static inline size_t neigh_nlmsg_size(void)
 	       + nla_total_size(MAX_ADDR_LEN) /* NDA_LLADDR */
 	       + nla_total_size(sizeof(struct nda_cacheinfo))
 	       + nla_total_size(4)  /* NDA_PROBES */
+	       + nla_total_size(4)  /* NDA_FLAGS_EXT */
 	       + nla_total_size(1); /* NDA_PROTOCOL */
 }
 
@@ -2854,6 +2878,7 @@ static inline size_t pneigh_nlmsg_size(void)
 {
 	return NLMSG_ALIGN(sizeof(struct ndmsg))
 	       + nla_total_size(MAX_ADDR_LEN) /* NDA_DST */
+	       + nla_total_size(4)  /* NDA_FLAGS_EXT */
 	       + nla_total_size(1); /* NDA_PROTOCOL */
 }