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![Pablo Neira Ayuso](/assets/img/avatar_default.png)
This patch generalizes nf_ct_l4proto_net by splitting it into chunks and moving the corresponding protocol part to where it really belongs to. To clarify, note that we follow two different approaches to support per-net depending if it's built-in or run-time loadable protocol tracker. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> Acked-by: Gao feng <gaofeng@cn.fujitsu.com>
216 lines
5.2 KiB
C
216 lines
5.2 KiB
C
/* (C) 1999-2001 Paul `Rusty' Russell
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* (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/types.h>
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#include <linux/jiffies.h>
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#include <linux/timer.h>
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#include <linux/netfilter.h>
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#include <net/netfilter/nf_conntrack_l4proto.h>
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static unsigned int nf_ct_generic_timeout __read_mostly = 600*HZ;
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static inline struct nf_generic_net *generic_pernet(struct net *net)
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{
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return &net->ct.nf_ct_proto.generic;
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}
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static bool generic_pkt_to_tuple(const struct sk_buff *skb,
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unsigned int dataoff,
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struct nf_conntrack_tuple *tuple)
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{
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tuple->src.u.all = 0;
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tuple->dst.u.all = 0;
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return true;
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}
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static bool generic_invert_tuple(struct nf_conntrack_tuple *tuple,
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const struct nf_conntrack_tuple *orig)
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{
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tuple->src.u.all = 0;
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tuple->dst.u.all = 0;
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return true;
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}
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/* Print out the per-protocol part of the tuple. */
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static int generic_print_tuple(struct seq_file *s,
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const struct nf_conntrack_tuple *tuple)
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{
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return 0;
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}
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static unsigned int *generic_get_timeouts(struct net *net)
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{
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return &(generic_pernet(net)->timeout);
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}
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/* Returns verdict for packet, or -1 for invalid. */
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static int generic_packet(struct nf_conn *ct,
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const struct sk_buff *skb,
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unsigned int dataoff,
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enum ip_conntrack_info ctinfo,
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u_int8_t pf,
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unsigned int hooknum,
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unsigned int *timeout)
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{
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nf_ct_refresh_acct(ct, ctinfo, skb, *timeout);
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return NF_ACCEPT;
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}
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/* Called when a new connection for this protocol found. */
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static bool generic_new(struct nf_conn *ct, const struct sk_buff *skb,
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unsigned int dataoff, unsigned int *timeouts)
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{
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return true;
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}
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#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
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#include <linux/netfilter/nfnetlink.h>
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#include <linux/netfilter/nfnetlink_cttimeout.h>
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static int generic_timeout_nlattr_to_obj(struct nlattr *tb[],
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struct net *net, void *data)
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{
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unsigned int *timeout = data;
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struct nf_generic_net *gn = generic_pernet(net);
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if (tb[CTA_TIMEOUT_GENERIC_TIMEOUT])
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*timeout =
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ntohl(nla_get_be32(tb[CTA_TIMEOUT_GENERIC_TIMEOUT])) * HZ;
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else {
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/* Set default generic timeout. */
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*timeout = gn->timeout;
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}
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return 0;
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}
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static int
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generic_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data)
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{
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const unsigned int *timeout = data;
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if (nla_put_be32(skb, CTA_TIMEOUT_GENERIC_TIMEOUT, htonl(*timeout / HZ)))
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goto nla_put_failure;
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return 0;
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nla_put_failure:
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return -ENOSPC;
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}
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static const struct nla_policy
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generic_timeout_nla_policy[CTA_TIMEOUT_GENERIC_MAX+1] = {
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[CTA_TIMEOUT_GENERIC_TIMEOUT] = { .type = NLA_U32 },
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};
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#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
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#ifdef CONFIG_SYSCTL
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static struct ctl_table generic_sysctl_table[] = {
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{
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.procname = "nf_conntrack_generic_timeout",
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = proc_dointvec_jiffies,
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},
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{ }
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};
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#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
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static struct ctl_table generic_compat_sysctl_table[] = {
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{
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.procname = "ip_conntrack_generic_timeout",
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = proc_dointvec_jiffies,
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},
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{ }
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};
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#endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
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#endif /* CONFIG_SYSCTL */
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static int generic_kmemdup_sysctl_table(struct nf_proto_net *pn,
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struct nf_generic_net *gn)
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{
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#ifdef CONFIG_SYSCTL
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pn->ctl_table = kmemdup(generic_sysctl_table,
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sizeof(generic_sysctl_table),
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GFP_KERNEL);
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if (!pn->ctl_table)
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return -ENOMEM;
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pn->ctl_table[0].data = &gn->timeout;
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#endif
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return 0;
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}
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static int generic_kmemdup_compat_sysctl_table(struct nf_proto_net *pn,
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struct nf_generic_net *gn)
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{
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#ifdef CONFIG_SYSCTL
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#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
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pn->ctl_compat_table = kmemdup(generic_compat_sysctl_table,
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sizeof(generic_compat_sysctl_table),
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GFP_KERNEL);
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if (!pn->ctl_compat_table)
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return -ENOMEM;
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pn->ctl_compat_table[0].data = &gn->timeout;
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#endif
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#endif
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return 0;
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}
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static int generic_init_net(struct net *net, u_int16_t proto)
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{
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int ret;
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struct nf_generic_net *gn = generic_pernet(net);
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struct nf_proto_net *pn = &gn->pn;
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gn->timeout = nf_ct_generic_timeout;
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ret = generic_kmemdup_compat_sysctl_table(pn, gn);
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if (ret < 0)
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return ret;
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ret = generic_kmemdup_sysctl_table(pn, gn);
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if (ret < 0)
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nf_ct_kfree_compat_sysctl_table(pn);
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return ret;
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}
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static struct nf_proto_net *generic_get_net_proto(struct net *net)
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{
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return &net->ct.nf_ct_proto.generic.pn;
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}
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struct nf_conntrack_l4proto nf_conntrack_l4proto_generic __read_mostly =
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{
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.l3proto = PF_UNSPEC,
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.l4proto = 255,
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.name = "unknown",
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.pkt_to_tuple = generic_pkt_to_tuple,
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.invert_tuple = generic_invert_tuple,
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.print_tuple = generic_print_tuple,
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.packet = generic_packet,
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.get_timeouts = generic_get_timeouts,
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.new = generic_new,
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#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
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.ctnl_timeout = {
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.nlattr_to_obj = generic_timeout_nlattr_to_obj,
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.obj_to_nlattr = generic_timeout_obj_to_nlattr,
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.nlattr_max = CTA_TIMEOUT_GENERIC_MAX,
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.obj_size = sizeof(unsigned int),
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.nla_policy = generic_timeout_nla_policy,
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},
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#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
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.init_net = generic_init_net,
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.get_net_proto = generic_get_net_proto,
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};
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