diff options
Diffstat (limited to 'net/netfilter/nf_conntrack_helper.c')
-rw-r--r-- | net/netfilter/nf_conntrack_helper.c | 98 |
1 files changed, 0 insertions, 98 deletions
diff --git a/net/netfilter/nf_conntrack_helper.c b/net/netfilter/nf_conntrack_helper.c index 48ea6d0264b5..0c4db2f2ac43 100644 --- a/net/netfilter/nf_conntrack_helper.c +++ b/net/netfilter/nf_conntrack_helper.c @@ -242,104 +242,6 @@ int __nf_ct_try_assign_helper(struct nf_conn *ct, struct nf_conn *tmpl, } EXPORT_SYMBOL_GPL(__nf_ct_try_assign_helper); -/* 'skb' should already be pulled to nh_ofs. */ -int nf_ct_helper(struct sk_buff *skb, struct nf_conn *ct, - enum ip_conntrack_info ctinfo, u16 proto) -{ - const struct nf_conntrack_helper *helper; - const struct nf_conn_help *help; - unsigned int protoff; - int err; - - if (ctinfo == IP_CT_RELATED_REPLY) - return NF_ACCEPT; - - help = nfct_help(ct); - if (!help) - return NF_ACCEPT; - - helper = rcu_dereference(help->helper); - if (!helper) - return NF_ACCEPT; - - if (helper->tuple.src.l3num != NFPROTO_UNSPEC && - helper->tuple.src.l3num != proto) - return NF_ACCEPT; - - switch (proto) { - case NFPROTO_IPV4: - protoff = ip_hdrlen(skb); - proto = ip_hdr(skb)->protocol; - break; - case NFPROTO_IPV6: { - u8 nexthdr = ipv6_hdr(skb)->nexthdr; - __be16 frag_off; - int ofs; - - ofs = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr, - &frag_off); - if (ofs < 0 || (frag_off & htons(~0x7)) != 0) { - pr_debug("proto header not found\n"); - return NF_ACCEPT; - } - protoff = ofs; - proto = nexthdr; - break; - } - default: - WARN_ONCE(1, "helper invoked on non-IP family!"); - return NF_DROP; - } - - if (helper->tuple.dst.protonum != proto) - return NF_ACCEPT; - - err = helper->help(skb, protoff, ct, ctinfo); - if (err != NF_ACCEPT) - return err; - - /* Adjust seqs after helper. This is needed due to some helpers (e.g., - * FTP with NAT) adusting the TCP payload size when mangling IP - * addresses and/or port numbers in the text-based control connection. - */ - if (test_bit(IPS_SEQ_ADJUST_BIT, &ct->status) && - !nf_ct_seq_adjust(skb, ct, ctinfo, protoff)) - return NF_DROP; - return NF_ACCEPT; -} -EXPORT_SYMBOL_GPL(nf_ct_helper); - -int nf_ct_add_helper(struct nf_conn *ct, const char *name, u8 family, - u8 proto, bool nat, struct nf_conntrack_helper **hp) -{ - struct nf_conntrack_helper *helper; - struct nf_conn_help *help; - int ret = 0; - - helper = nf_conntrack_helper_try_module_get(name, family, proto); - if (!helper) - return -EINVAL; - - help = nf_ct_helper_ext_add(ct, GFP_KERNEL); - if (!help) { - nf_conntrack_helper_put(helper); - return -ENOMEM; - } -#if IS_ENABLED(CONFIG_NF_NAT) - if (nat) { - ret = nf_nat_helper_try_module_get(name, family, proto); - if (ret) { - nf_conntrack_helper_put(helper); - return ret; - } - } -#endif - rcu_assign_pointer(help->helper, helper); - *hp = helper; - return ret; -} -EXPORT_SYMBOL_GPL(nf_ct_add_helper); - /* appropriate ct lock protecting must be taken by caller */ static int unhelp(struct nf_conn *ct, void *me) { |