diff options
author | Florian Westphal <fw@strlen.de> | 2018-05-15 00:46:56 +0300 |
---|---|---|
committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2018-05-23 10:14:05 +0300 |
commit | 06cad3acf07893820391bda912bebc3a8c058994 (patch) | |
tree | 7980b3592fd44f4e6d2ab923d4a914d90de1ab2b /net/netfilter/core.c | |
parent | 4e25ceb80b585891c5e2a6edfa481bc4709e9544 (diff) |
netfilter: core: export raw versions of add/delete hook functions
This will allow the nat core to reuse the nf_hook infrastructure
to maintain nat lookup functions.
The raw versions don't assume a particular hook location, the
functions get added/deleted from the hook blob that is passed to the
functions.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/netfilter/core.c')
-rw-r--r-- | net/netfilter/core.c | 75 |
1 files changed, 54 insertions, 21 deletions
diff --git a/net/netfilter/core.c b/net/netfilter/core.c index 0f6b8172fb9a..5f0ebf9a8d5b 100644 --- a/net/netfilter/core.c +++ b/net/netfilter/core.c @@ -186,9 +186,31 @@ static void hooks_validate(const struct nf_hook_entries *hooks) #endif } +int nf_hook_entries_insert_raw(struct nf_hook_entries __rcu **pp, + const struct nf_hook_ops *reg) +{ + struct nf_hook_entries *new_hooks; + struct nf_hook_entries *p; + + p = rcu_dereference_raw(*pp); + new_hooks = nf_hook_entries_grow(p, reg); + if (IS_ERR(new_hooks)) + return PTR_ERR(new_hooks); + + hooks_validate(new_hooks); + + rcu_assign_pointer(*pp, new_hooks); + + BUG_ON(p == new_hooks); + nf_hook_entries_free(p); + return 0; +} +EXPORT_SYMBOL_GPL(nf_hook_entries_insert_raw); + /* * __nf_hook_entries_try_shrink - try to shrink hook array * + * @old -- current hook blob at @pp * @pp -- location of hook blob * * Hook unregistration must always succeed, so to-be-removed hooks @@ -201,14 +223,14 @@ static void hooks_validate(const struct nf_hook_entries *hooks) * * Returns address to free, or NULL. */ -static void *__nf_hook_entries_try_shrink(struct nf_hook_entries __rcu **pp) +static void *__nf_hook_entries_try_shrink(struct nf_hook_entries *old, + struct nf_hook_entries __rcu **pp) { - struct nf_hook_entries *old, *new = NULL; unsigned int i, j, skip = 0, hook_entries; + struct nf_hook_entries *new = NULL; struct nf_hook_ops **orig_ops; struct nf_hook_ops **new_ops; - old = nf_entry_dereference(*pp); if (WARN_ON_ONCE(!old)) return NULL; @@ -347,11 +369,10 @@ static int __nf_register_net_hook(struct net *net, int pf, * This cannot fail, hook unregistration must always succeed. * Therefore replace the to-be-removed hook with a dummy hook. */ -static void nf_remove_net_hook(struct nf_hook_entries *old, - const struct nf_hook_ops *unreg, int pf) +static bool nf_remove_net_hook(struct nf_hook_entries *old, + const struct nf_hook_ops *unreg) { struct nf_hook_ops **orig_ops; - bool found = false; unsigned int i; orig_ops = nf_hook_entries_get_hook_ops(old); @@ -360,21 +381,10 @@ static void nf_remove_net_hook(struct nf_hook_entries *old, continue; WRITE_ONCE(old->hooks[i].hook, accept_all); WRITE_ONCE(orig_ops[i], &dummy_ops); - found = true; - break; + return true; } - if (found) { -#ifdef CONFIG_NETFILTER_INGRESS - if (pf == NFPROTO_NETDEV && unreg->hooknum == NF_NETDEV_INGRESS) - net_dec_ingress_queue(); -#endif -#ifdef HAVE_JUMP_LABEL - static_key_slow_dec(&nf_hooks_needed[pf][unreg->hooknum]); -#endif - } else { - WARN_ONCE(1, "hook not found, pf %d num %d", pf, unreg->hooknum); - } + return false; } static void __nf_unregister_net_hook(struct net *net, int pf, @@ -395,9 +405,19 @@ static void __nf_unregister_net_hook(struct net *net, int pf, return; } - nf_remove_net_hook(p, reg, pf); + if (nf_remove_net_hook(p, reg)) { +#ifdef CONFIG_NETFILTER_INGRESS + if (pf == NFPROTO_NETDEV && reg->hooknum == NF_NETDEV_INGRESS) + net_dec_ingress_queue(); +#endif +#ifdef HAVE_JUMP_LABEL + static_key_slow_dec(&nf_hooks_needed[pf][reg->hooknum]); +#endif + } else { + WARN_ONCE(1, "hook not found, pf %d num %d", pf, reg->hooknum); + } - p = __nf_hook_entries_try_shrink(pp); + p = __nf_hook_entries_try_shrink(p, pp); mutex_unlock(&nf_hook_mutex); if (!p) return; @@ -417,6 +437,19 @@ void nf_unregister_net_hook(struct net *net, const struct nf_hook_ops *reg) } EXPORT_SYMBOL(nf_unregister_net_hook); +void nf_hook_entries_delete_raw(struct nf_hook_entries __rcu **pp, + const struct nf_hook_ops *reg) +{ + struct nf_hook_entries *p; + + p = rcu_dereference_raw(*pp); + if (nf_remove_net_hook(p, reg)) { + p = __nf_hook_entries_try_shrink(p, pp); + nf_hook_entries_free(p); + } +} +EXPORT_SYMBOL_GPL(nf_hook_entries_delete_raw); + int nf_register_net_hook(struct net *net, const struct nf_hook_ops *reg) { int err; |