Commit 7f7c6bb7 authored by Jakub Kicinski's avatar Jakub Kicinski
Browse files

Merge branch 'ipv6-follow-up-for-rtnl-free-rtm_newroute-series' 

Kuniyuki Iwashima says:

====================
ipv6: Follow up for RTNL-free RTM_NEWROUTE series.

Patch 1 removes rcu_read_lock() in fib6_get_table().
Patch 2 removes rtnl_is_held arg for lwtunnel_valid_encap_type(), which
 was short-term fix and is no longer used.
Patch 3 fixes RCU vs GFP_KERNEL report by syzkaller.
Patch 4~7 reverts GFP_ATOMIC uses to GFP_KERNEL.

v1: https://lore.kernel.org/20250514201943.74456-1-kuniyu@amazon.com
====================

Link: https://patch.msgid.link/20250516022759.44392-1-kuniyu@amazon.com


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parents 5b1ced44 002dba13

include/net/lwtunnel.h

+5 −8
Original line number Diff line number Diff line
@@ -116,11 +116,9 @@ int lwtunnel_encap_add_ops(const struct lwtunnel_encap_ops *op, 
int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op,

			   unsigned int num);

int lwtunnel_valid_encap_type(u16 encap_type,

			      struct netlink_ext_ack *extack,

			      bool rtnl_is_held);

			      struct netlink_ext_ack *extack);

int lwtunnel_valid_encap_type_attr(struct nlattr *attr, int len,

				   struct netlink_ext_ack *extack,

				   bool rtnl_is_held);

				   struct netlink_ext_ack *extack);

int lwtunnel_build_state(struct net *net, u16 encap_type,

			 struct nlattr *encap,

			 unsigned int family, const void *cfg,
@@ -203,15 +201,14 @@ static inline int lwtunnel_encap_del_ops(const struct lwtunnel_encap_ops *op, 
}



static inline int lwtunnel_valid_encap_type(u16 encap_type,

					    struct netlink_ext_ack *extack,

					    bool rtnl_is_held)

					    struct netlink_ext_ack *extack)

{

	NL_SET_ERR_MSG(extack, "CONFIG_LWTUNNEL is not enabled in this kernel");

	return -EOPNOTSUPP;

}



static inline int lwtunnel_valid_encap_type_attr(struct nlattr *attr, int len,

						 struct netlink_ext_ack *extack,

						 bool rtnl_is_held)

						 struct netlink_ext_ack *extack)

{

	/* return 0 since we are not walking attr looking for

	 * RTA_ENCAP_TYPE attribute on nexthops.

net/core/lwtunnel.c

+3 −12
Original line number Diff line number Diff line
@@ -149,8 +149,7 @@ int lwtunnel_build_state(struct net *net, u16 encap_type, 
}

EXPORT_SYMBOL_GPL(lwtunnel_build_state);



int lwtunnel_valid_encap_type(u16 encap_type, struct netlink_ext_ack *extack,

			      bool rtnl_is_held)

int lwtunnel_valid_encap_type(u16 encap_type, struct netlink_ext_ack *extack)

{

	const struct lwtunnel_encap_ops *ops;

	int ret = -EINVAL;
@@ -167,12 +166,7 @@ int lwtunnel_valid_encap_type(u16 encap_type, struct netlink_ext_ack *extack, 
		const char *encap_type_str = lwtunnel_encap_str(encap_type);



		if (encap_type_str) {

			if (rtnl_is_held)

				__rtnl_unlock();

			request_module("rtnl-lwt-%s", encap_type_str);

			if (rtnl_is_held)

				rtnl_lock();



			ops = rcu_access_pointer(lwtun_encaps[encap_type]);

		}

	}
@@ -186,8 +180,7 @@ int lwtunnel_valid_encap_type(u16 encap_type, struct netlink_ext_ack *extack, 
EXPORT_SYMBOL_GPL(lwtunnel_valid_encap_type);



int lwtunnel_valid_encap_type_attr(struct nlattr *attr, int remaining,

				   struct netlink_ext_ack *extack,

				   bool rtnl_is_held)

				   struct netlink_ext_ack *extack)

{

	struct rtnexthop *rtnh = (struct rtnexthop *)attr;

	struct nlattr *nla_entype;
@@ -208,9 +201,7 @@ int lwtunnel_valid_encap_type_attr(struct nlattr *attr, int remaining, 
				}

				encap_type = nla_get_u16(nla_entype);



				if (lwtunnel_valid_encap_type(encap_type,

							      extack,

							      rtnl_is_held) != 0)

				if (lwtunnel_valid_encap_type(encap_type, extack))

					return -EOPNOTSUPP;

			}

		}

net/ipv4/fib_frontend.c

+2 −2
Original line number Diff line number Diff line
@@ -807,7 +807,7 @@ static int rtm_to_fib_config(struct net *net, struct sk_buff *skb, 
		case RTA_MULTIPATH:

			err = lwtunnel_valid_encap_type_attr(nla_data(attr),

							     nla_len(attr),

							     extack, false);

							     extack);

			if (err < 0)

				goto errout;

			cfg->fc_mp = nla_data(attr);
@@ -825,7 +825,7 @@ static int rtm_to_fib_config(struct net *net, struct sk_buff *skb, 
		case RTA_ENCAP_TYPE:

			cfg->fc_encap_type = nla_get_u16(attr);

			err = lwtunnel_valid_encap_type(cfg->fc_encap_type,

							extack, false);

							extack);

			if (err < 0)

				goto errout;

			break;

net/ipv4/fib_semantics.c

+4 −6
Original line number Diff line number Diff line
@@ -617,12 +617,10 @@ int fib_nh_common_init(struct net *net, struct fib_nh_common *nhc, 
{

	int err;



	if (!nhc->nhc_pcpu_rth_output) {

	nhc->nhc_pcpu_rth_output = alloc_percpu_gfp(struct rtable __rcu *,

						    gfp_flags);

	if (!nhc->nhc_pcpu_rth_output)

		return -ENOMEM;

	}



	if (encap) {

		struct lwtunnel_state *lwtstate;

net/ipv4/nexthop.c

+1 −2
Original line number Diff line number Diff line
@@ -3180,8 +3180,7 @@ static int rtm_to_nh_config(struct net *net, struct sk_buff *skb, 
		}



		cfg->nh_encap_type = nla_get_u16(tb[NHA_ENCAP_TYPE]);

		err = lwtunnel_valid_encap_type(cfg->nh_encap_type,

						extack, false);

		err = lwtunnel_valid_encap_type(cfg->nh_encap_type, extack);

		if (err < 0)

			goto out;