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- /* (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_SCTP_MODULE
- case IPPROTO_SCTP:
- return false;
- #endif
- #ifdef CONFIG_NF_CT_PROTO_DCCP_MODULE
- case IPPROTO_DCCP:
- return false;
- #endif
- #ifdef CONFIG_NF_CT_PROTO_GRE_MODULE
- case IPPROTO_GRE:
- return false;
- #endif
- #ifdef CONFIG_NF_CT_PROTO_UDPLITE_MODULE
- case IPPROTO_UDPLITE:
- 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;
- }
- /* Print out the per-protocol part of the tuple. */
- static void generic_print_tuple(struct seq_file *s,
- const struct nf_conntrack_tuple *tuple)
- {
- }
- 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 hooknum,
- 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,
- },
- { }
- };
- #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
- static struct ctl_table generic_compat_sysctl_table[] = {
- {
- .procname = "ip_conntrack_generic_timeout",
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = proc_dointvec_jiffies,
- },
- { }
- };
- #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
- #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_kmemdup_compat_sysctl_table(struct nf_proto_net *pn,
- struct nf_generic_net *gn)
- {
- #ifdef CONFIG_SYSCTL
- #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
- pn->ctl_compat_table = kmemdup(generic_compat_sysctl_table,
- sizeof(generic_compat_sysctl_table),
- GFP_KERNEL);
- if (!pn->ctl_compat_table)
- return -ENOMEM;
- pn->ctl_compat_table[0].data = &gn->timeout;
- #endif
- #endif
- return 0;
- }
- static int generic_init_net(struct net *net, u_int16_t proto)
- {
- int ret;
- struct nf_generic_net *gn = generic_pernet(net);
- struct nf_proto_net *pn = &gn->pn;
- gn->timeout = nf_ct_generic_timeout;
- ret = generic_kmemdup_compat_sysctl_table(pn, gn);
- if (ret < 0)
- return ret;
- ret = generic_kmemdup_sysctl_table(pn, gn);
- if (ret < 0)
- nf_ct_kfree_compat_sysctl_table(pn);
- return ret;
- }
- 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,
- .name = "unknown",
- .pkt_to_tuple = generic_pkt_to_tuple,
- .invert_tuple = generic_invert_tuple,
- .print_tuple = generic_print_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,
- };
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