| /* (C) 1999-2001 Paul `Rusty' Russell |
| * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #include <linux/types.h> |
| #include <linux/jiffies.h> |
| #include <linux/timer.h> |
| #include <linux/netfilter.h> |
| #include <net/netfilter/nf_conntrack_l4proto.h> |
| |
| static unsigned int nf_ct_generic_timeout __read_mostly = 600*HZ; |
| |
| static bool nf_generic_should_process(u8 proto) |
| { |
| switch (proto) { |
| #ifdef CONFIG_NF_CT_PROTO_GRE_MODULE |
| case IPPROTO_GRE: |
| return false; |
| #endif |
| default: |
| return true; |
| } |
| } |
| |
| static inline struct nf_generic_net *generic_pernet(struct net *net) |
| { |
| return &net->ct.nf_ct_proto.generic; |
| } |
| |
| static bool generic_pkt_to_tuple(const struct sk_buff *skb, |
| unsigned int dataoff, |
| struct net *net, struct nf_conntrack_tuple *tuple) |
| { |
| tuple->src.u.all = 0; |
| tuple->dst.u.all = 0; |
| |
| return true; |
| } |
| |
| static bool generic_invert_tuple(struct nf_conntrack_tuple *tuple, |
| const struct nf_conntrack_tuple *orig) |
| { |
| tuple->src.u.all = 0; |
| tuple->dst.u.all = 0; |
| |
| return true; |
| } |
| |
| static unsigned int *generic_get_timeouts(struct net *net) |
| { |
| return &(generic_pernet(net)->timeout); |
| } |
| |
| /* Returns verdict for packet, or -1 for invalid. */ |
| static int generic_packet(struct nf_conn *ct, |
| const struct sk_buff *skb, |
| unsigned int dataoff, |
| enum ip_conntrack_info ctinfo, |
| u_int8_t pf, |
| unsigned int *timeout) |
| { |
| nf_ct_refresh_acct(ct, ctinfo, skb, *timeout); |
| return NF_ACCEPT; |
| } |
| |
| /* Called when a new connection for this protocol found. */ |
| static bool generic_new(struct nf_conn *ct, const struct sk_buff *skb, |
| unsigned int dataoff, unsigned int *timeouts) |
| { |
| bool ret; |
| |
| ret = nf_generic_should_process(nf_ct_protonum(ct)); |
| if (!ret) |
| pr_warn_once("conntrack: generic helper won't handle protocol %d. Please consider loading the specific helper module.\n", |
| nf_ct_protonum(ct)); |
| return ret; |
| } |
| |
| #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) |
| |
| #include <linux/netfilter/nfnetlink.h> |
| #include <linux/netfilter/nfnetlink_cttimeout.h> |
| |
| static int generic_timeout_nlattr_to_obj(struct nlattr *tb[], |
| struct net *net, void *data) |
| { |
| unsigned int *timeout = data; |
| struct nf_generic_net *gn = generic_pernet(net); |
| |
| if (tb[CTA_TIMEOUT_GENERIC_TIMEOUT]) |
| *timeout = |
| ntohl(nla_get_be32(tb[CTA_TIMEOUT_GENERIC_TIMEOUT])) * HZ; |
| else { |
| /* Set default generic timeout. */ |
| *timeout = gn->timeout; |
| } |
| |
| return 0; |
| } |
| |
| static int |
| generic_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data) |
| { |
| const unsigned int *timeout = data; |
| |
| if (nla_put_be32(skb, CTA_TIMEOUT_GENERIC_TIMEOUT, htonl(*timeout / HZ))) |
| goto nla_put_failure; |
| |
| return 0; |
| |
| nla_put_failure: |
| return -ENOSPC; |
| } |
| |
| static const struct nla_policy |
| generic_timeout_nla_policy[CTA_TIMEOUT_GENERIC_MAX+1] = { |
| [CTA_TIMEOUT_GENERIC_TIMEOUT] = { .type = NLA_U32 }, |
| }; |
| #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ |
| |
| #ifdef CONFIG_SYSCTL |
| static struct ctl_table generic_sysctl_table[] = { |
| { |
| .procname = "nf_conntrack_generic_timeout", |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_jiffies, |
| }, |
| { } |
| }; |
| #endif /* CONFIG_SYSCTL */ |
| |
| static int generic_kmemdup_sysctl_table(struct nf_proto_net *pn, |
| struct nf_generic_net *gn) |
| { |
| #ifdef CONFIG_SYSCTL |
| pn->ctl_table = kmemdup(generic_sysctl_table, |
| sizeof(generic_sysctl_table), |
| GFP_KERNEL); |
| if (!pn->ctl_table) |
| return -ENOMEM; |
| |
| pn->ctl_table[0].data = &gn->timeout; |
| #endif |
| return 0; |
| } |
| |
| static int generic_init_net(struct net *net, u_int16_t proto) |
| { |
| struct nf_generic_net *gn = generic_pernet(net); |
| struct nf_proto_net *pn = &gn->pn; |
| |
| gn->timeout = nf_ct_generic_timeout; |
| |
| return generic_kmemdup_sysctl_table(pn, gn); |
| } |
| |
| static struct nf_proto_net *generic_get_net_proto(struct net *net) |
| { |
| return &net->ct.nf_ct_proto.generic.pn; |
| } |
| |
| struct nf_conntrack_l4proto nf_conntrack_l4proto_generic __read_mostly = |
| { |
| .l3proto = PF_UNSPEC, |
| .l4proto = 255, |
| .pkt_to_tuple = generic_pkt_to_tuple, |
| .invert_tuple = generic_invert_tuple, |
| .packet = generic_packet, |
| .get_timeouts = generic_get_timeouts, |
| .new = generic_new, |
| #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) |
| .ctnl_timeout = { |
| .nlattr_to_obj = generic_timeout_nlattr_to_obj, |
| .obj_to_nlattr = generic_timeout_obj_to_nlattr, |
| .nlattr_max = CTA_TIMEOUT_GENERIC_MAX, |
| .obj_size = sizeof(unsigned int), |
| .nla_policy = generic_timeout_nla_policy, |
| }, |
| #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ |
| .init_net = generic_init_net, |
| .get_net_proto = generic_get_net_proto, |
| }; |