diff options
Diffstat (limited to 'net/netfilter/nf_conntrack_proto_udplite.c')
-rw-r--r-- | net/netfilter/nf_conntrack_proto_udplite.c | 324 |
1 files changed, 0 insertions, 324 deletions
diff --git a/net/netfilter/nf_conntrack_proto_udplite.c b/net/netfilter/nf_conntrack_proto_udplite.c deleted file mode 100644 index c35f7bf05d8c..000000000000 --- a/net/netfilter/nf_conntrack_proto_udplite.c +++ /dev/null @@ -1,324 +0,0 @@ -/* (C) 1999-2001 Paul `Rusty' Russell - * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> - * (C) 2007 Patrick McHardy <kaber@trash.net> - * - * 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/timer.h> -#include <linux/udp.h> -#include <linux/seq_file.h> -#include <linux/skbuff.h> -#include <linux/ipv6.h> -#include <net/ip6_checksum.h> -#include <net/checksum.h> - -#include <linux/netfilter.h> -#include <linux/netfilter_ipv4.h> -#include <linux/netfilter_ipv6.h> -#include <net/netfilter/nf_conntrack_l4proto.h> -#include <net/netfilter/nf_conntrack_ecache.h> -#include <net/netfilter/nf_log.h> - -static unsigned int udplite_timeouts[UDPLITE_CT_MAX] = { - [UDPLITE_CT_UNREPLIED] = 30*HZ, - [UDPLITE_CT_REPLIED] = 180*HZ, -}; - -static inline struct nf_udplite_net *udplite_pernet(struct net *net) -{ - return &net->ct.nf_ct_proto.udplite; -} - -static bool udplite_pkt_to_tuple(const struct sk_buff *skb, - unsigned int dataoff, - struct net *net, - struct nf_conntrack_tuple *tuple) -{ - const struct udphdr *hp; - struct udphdr _hdr; - - /* Actually only need first 4 bytes to get ports. */ - hp = skb_header_pointer(skb, dataoff, 4, &_hdr); - if (hp == NULL) - return false; - - tuple->src.u.udp.port = hp->source; - tuple->dst.u.udp.port = hp->dest; - return true; -} - -static bool udplite_invert_tuple(struct nf_conntrack_tuple *tuple, - const struct nf_conntrack_tuple *orig) -{ - tuple->src.u.udp.port = orig->dst.u.udp.port; - tuple->dst.u.udp.port = orig->src.u.udp.port; - return true; -} - -/* Print out the per-protocol part of the tuple. */ -static void udplite_print_tuple(struct seq_file *s, - const struct nf_conntrack_tuple *tuple) -{ - seq_printf(s, "sport=%hu dport=%hu ", - ntohs(tuple->src.u.udp.port), - ntohs(tuple->dst.u.udp.port)); -} - -static unsigned int *udplite_get_timeouts(struct net *net) -{ - return udplite_pernet(net)->timeouts; -} - -/* Returns verdict for packet, and may modify conntracktype */ -static int udplite_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 *timeouts) -{ - /* If we've seen traffic both ways, this is some kind of UDP - stream. Extend timeout. */ - if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) { - nf_ct_refresh_acct(ct, ctinfo, skb, - timeouts[UDPLITE_CT_REPLIED]); - /* Also, more likely to be important, and not a probe */ - if (!test_and_set_bit(IPS_ASSURED_BIT, &ct->status)) - nf_conntrack_event_cache(IPCT_ASSURED, ct); - } else { - nf_ct_refresh_acct(ct, ctinfo, skb, - timeouts[UDPLITE_CT_UNREPLIED]); - } - return NF_ACCEPT; -} - -/* Called when a new connection for this protocol found. */ -static bool udplite_new(struct nf_conn *ct, const struct sk_buff *skb, - unsigned int dataoff, unsigned int *timeouts) -{ - return true; -} - -static int udplite_error(struct net *net, struct nf_conn *tmpl, - struct sk_buff *skb, - unsigned int dataoff, - enum ip_conntrack_info *ctinfo, - u_int8_t pf, - unsigned int hooknum) -{ - unsigned int udplen = skb->len - dataoff; - const struct udphdr *hdr; - struct udphdr _hdr; - unsigned int cscov; - - /* Header is too small? */ - hdr = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr); - if (hdr == NULL) { - if (LOG_INVALID(net, IPPROTO_UDPLITE)) - nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL, - "nf_ct_udplite: short packet "); - return -NF_ACCEPT; - } - - cscov = ntohs(hdr->len); - if (cscov == 0) - cscov = udplen; - else if (cscov < sizeof(*hdr) || cscov > udplen) { - if (LOG_INVALID(net, IPPROTO_UDPLITE)) - nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL, - "nf_ct_udplite: invalid checksum coverage "); - return -NF_ACCEPT; - } - - /* UDPLITE mandates checksums */ - if (!hdr->check) { - if (LOG_INVALID(net, IPPROTO_UDPLITE)) - nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL, - "nf_ct_udplite: checksum missing "); - return -NF_ACCEPT; - } - - /* Checksum invalid? Ignore. */ - if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING && - nf_checksum_partial(skb, hooknum, dataoff, cscov, IPPROTO_UDP, - pf)) { - if (LOG_INVALID(net, IPPROTO_UDPLITE)) - nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL, - "nf_ct_udplite: bad UDPLite checksum "); - return -NF_ACCEPT; - } - - return NF_ACCEPT; -} - -#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) - -#include <linux/netfilter/nfnetlink.h> -#include <linux/netfilter/nfnetlink_cttimeout.h> - -static int udplite_timeout_nlattr_to_obj(struct nlattr *tb[], - struct net *net, void *data) -{ - unsigned int *timeouts = data; - struct nf_udplite_net *un = udplite_pernet(net); - - /* set default timeouts for UDPlite. */ - timeouts[UDPLITE_CT_UNREPLIED] = un->timeouts[UDPLITE_CT_UNREPLIED]; - timeouts[UDPLITE_CT_REPLIED] = un->timeouts[UDPLITE_CT_REPLIED]; - - if (tb[CTA_TIMEOUT_UDPLITE_UNREPLIED]) { - timeouts[UDPLITE_CT_UNREPLIED] = - ntohl(nla_get_be32(tb[CTA_TIMEOUT_UDPLITE_UNREPLIED])) * HZ; - } - if (tb[CTA_TIMEOUT_UDPLITE_REPLIED]) { - timeouts[UDPLITE_CT_REPLIED] = - ntohl(nla_get_be32(tb[CTA_TIMEOUT_UDPLITE_REPLIED])) * HZ; - } - return 0; -} - -static int -udplite_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data) -{ - const unsigned int *timeouts = data; - - if (nla_put_be32(skb, CTA_TIMEOUT_UDPLITE_UNREPLIED, - htonl(timeouts[UDPLITE_CT_UNREPLIED] / HZ)) || - nla_put_be32(skb, CTA_TIMEOUT_UDPLITE_REPLIED, - htonl(timeouts[UDPLITE_CT_REPLIED] / HZ))) - goto nla_put_failure; - return 0; - -nla_put_failure: - return -ENOSPC; -} - -static const struct nla_policy -udplite_timeout_nla_policy[CTA_TIMEOUT_UDPLITE_MAX+1] = { - [CTA_TIMEOUT_UDPLITE_UNREPLIED] = { .type = NLA_U32 }, - [CTA_TIMEOUT_UDPLITE_REPLIED] = { .type = NLA_U32 }, -}; -#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ - -#ifdef CONFIG_SYSCTL -static struct ctl_table udplite_sysctl_table[] = { - { - .procname = "nf_conntrack_udplite_timeout", - .maxlen = sizeof(unsigned int), - .mode = 0644, - .proc_handler = proc_dointvec_jiffies, - }, - { - .procname = "nf_conntrack_udplite_timeout_stream", - .maxlen = sizeof(unsigned int), - .mode = 0644, - .proc_handler = proc_dointvec_jiffies, - }, - { } -}; -#endif /* CONFIG_SYSCTL */ - -static int udplite_kmemdup_sysctl_table(struct nf_proto_net *pn, - struct nf_udplite_net *un) -{ -#ifdef CONFIG_SYSCTL - if (pn->ctl_table) - return 0; - - pn->ctl_table = kmemdup(udplite_sysctl_table, - sizeof(udplite_sysctl_table), - GFP_KERNEL); - if (!pn->ctl_table) - return -ENOMEM; - - pn->ctl_table[0].data = &un->timeouts[UDPLITE_CT_UNREPLIED]; - pn->ctl_table[1].data = &un->timeouts[UDPLITE_CT_REPLIED]; -#endif - return 0; -} - -static int udplite_init_net(struct net *net, u_int16_t proto) -{ - struct nf_udplite_net *un = udplite_pernet(net); - struct nf_proto_net *pn = &un->pn; - - if (!pn->users) { - int i; - - for (i = 0 ; i < UDPLITE_CT_MAX; i++) - un->timeouts[i] = udplite_timeouts[i]; - } - - return udplite_kmemdup_sysctl_table(pn, un); -} - -struct nf_conntrack_l4proto nf_conntrack_l4proto_udplite4 __read_mostly = -{ - .l3proto = PF_INET, - .l4proto = IPPROTO_UDPLITE, - .name = "udplite", - .allow_clash = true, - .pkt_to_tuple = udplite_pkt_to_tuple, - .invert_tuple = udplite_invert_tuple, - .print_tuple = udplite_print_tuple, - .packet = udplite_packet, - .get_timeouts = udplite_get_timeouts, - .new = udplite_new, - .error = udplite_error, -#if IS_ENABLED(CONFIG_NF_CT_NETLINK) - .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, - .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size, - .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, - .nla_policy = nf_ct_port_nla_policy, -#endif -#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) - .ctnl_timeout = { - .nlattr_to_obj = udplite_timeout_nlattr_to_obj, - .obj_to_nlattr = udplite_timeout_obj_to_nlattr, - .nlattr_max = CTA_TIMEOUT_UDPLITE_MAX, - .obj_size = sizeof(unsigned int) * - CTA_TIMEOUT_UDPLITE_MAX, - .nla_policy = udplite_timeout_nla_policy, - }, -#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ - .init_net = udplite_init_net, -}; -EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_udplite4); - -struct nf_conntrack_l4proto nf_conntrack_l4proto_udplite6 __read_mostly = -{ - .l3proto = PF_INET6, - .l4proto = IPPROTO_UDPLITE, - .name = "udplite", - .allow_clash = true, - .pkt_to_tuple = udplite_pkt_to_tuple, - .invert_tuple = udplite_invert_tuple, - .print_tuple = udplite_print_tuple, - .packet = udplite_packet, - .get_timeouts = udplite_get_timeouts, - .new = udplite_new, - .error = udplite_error, -#if IS_ENABLED(CONFIG_NF_CT_NETLINK) - .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, - .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size, - .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, - .nla_policy = nf_ct_port_nla_policy, -#endif -#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) - .ctnl_timeout = { - .nlattr_to_obj = udplite_timeout_nlattr_to_obj, - .obj_to_nlattr = udplite_timeout_obj_to_nlattr, - .nlattr_max = CTA_TIMEOUT_UDPLITE_MAX, - .obj_size = sizeof(unsigned int) * - CTA_TIMEOUT_UDPLITE_MAX, - .nla_policy = udplite_timeout_nla_policy, - }, -#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ - .init_net = udplite_init_net, -}; -EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_udplite6); |