netfilter: nft_log: perform module load from nf_tables

modprobe calls from the nf_logger_find_get() API causes deadlock in very
special cases because they occur with the nf_tables transaction mutex held.

In the specific case of nf_log, deadlock is via:

 A nf_tables -> transaction mutex -> nft_log -> modprobe -> nf_log_syslog \
	    -> pernet_ops rwsem -> wait for C
 B netlink event -> rtnl_mutex -> nf_tables transaction mutex -> wait for A
 C close() -> ip6mr_sk_done -> rtnl_mutex -> wait for B

Earlier patch added NFLOG/xt_LOG module softdeps to avoid the need to load
the backend module during a transaction.

For nft_log we would have to add a softdep for both nfnetlink_log or
nf_log_syslog, since we do not know in advance which of the two backends
are going to be configured.

This defers the modprobe op until after the transaction mutex is released.

Tested-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/include/net/netfilter/nf_tables.h b/include/net/netfilter/nf_tables.h
index 0cef5ad..8fefa11 100644 (file)
--- a/include/net/netfilter/nf_tables.h
+++ b/include/net/netfilter/nf_tables.h
@@ -1562,4 +1562,9 @@ void nf_tables_trans_destroy_flush_work(void);
 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result);
 __be64 nf_jiffies64_to_msecs(u64 input);
 
+#ifdef CONFIG_MODULES
+__printf(2, 3) int nft_request_module(struct net *net, const char *fmt, ...);
+#else
+static inline int nft_request_module(struct net *net, const char *fmt, ...) { return -ENOENT; }
+#endif
 #endif /* _NET_NF_TABLES_H */

diff --git a/net/netfilter/nf_log.c b/net/netfilter/nf_log.c
index eaa8181..edee7fa 100644 (file)
--- a/net/netfilter/nf_log.c
+++ b/net/netfilter/nf_log.c
@@ -170,9 +170,6 @@ int nf_logger_find_get(int pf, enum nf_log_type type)
                return 0;
        }
 
-       if (rcu_access_pointer(loggers[pf][type]) == NULL)
-               request_module("nf-logger-%u-%u", pf, type);
-
        rcu_read_lock();
        logger = rcu_dereference(loggers[pf][type]);
        if (logger == NULL)

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index fc2526b..c09b67f 100644 (file)
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -586,8 +586,8 @@ struct nft_module_request {
 };
 
 #ifdef CONFIG_MODULES
-static __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
-                                            ...)
+__printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
+                                     ...)
 {
        char module_name[MODULE_NAME_LEN];
        struct nft_module_request *req;
@@ -620,6 +620,7 @@ static __printf(2, 3) int nft_request_module(struct net *net, const char *fmt,
 
        return -EAGAIN;
 }
+EXPORT_SYMBOL_GPL(nft_request_module);
 #endif
 
 static void lockdep_nfnl_nft_mutex_not_held(void)

diff --git a/net/netfilter/nft_log.c b/net/netfilter/nft_log.c
index a06a46b..54f6c20 100644 (file)
--- a/net/netfilter/nft_log.c
+++ b/net/netfilter/nft_log.c
@@ -128,6 +128,20 @@ static const struct nla_policy nft_log_policy[NFTA_LOG_MAX + 1] = {
        [NFTA_LOG_FLAGS]        = { .type = NLA_U32 },
 };
 
+static int nft_log_modprobe(struct net *net, enum nf_log_type t)
+{
+       switch (t) {
+       case NF_LOG_TYPE_LOG:
+               return nft_request_module(net, "%s", "nf_log_syslog");
+       case NF_LOG_TYPE_ULOG:
+               return nft_request_module(net, "%s", "nfnetlink_log");
+       case NF_LOG_TYPE_MAX:
+               break;
+       }
+
+       return -ENOENT;
+}
+
 static int nft_log_init(const struct nft_ctx *ctx,
                        const struct nft_expr *expr,
                        const struct nlattr * const tb[])
@@ -197,8 +211,12 @@ static int nft_log_init(const struct nft_ctx *ctx,
                return 0;
 
        err = nf_logger_find_get(ctx->family, li->type);
-       if (err < 0)
+       if (err < 0) {
+               if (nft_log_modprobe(ctx->net, li->type) == -EAGAIN)
+                       err = -EAGAIN;
+
                goto err1;
+       }
 
        return 0;