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Release 4.11 net/netfilter/nf_conntrack_proto_udp.c

Directory: net/netfilter
/* (C) 1999-2001 Paul `Rusty' Russell
 * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
 * (C) 2006-2012 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/module.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>
#include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
#include <net/netfilter/ipv6/nf_conntrack_ipv6.h>


static unsigned int udp_timeouts[UDP_CT_MAX] = {
	[UDP_CT_UNREPLIED]	= 30*HZ,
	[UDP_CT_REPLIED]	= 180*HZ,
};


static inline struct nf_udp_net *udp_pernet(struct net *net) { return &net->ct.nf_ct_proto.udp; }

Contributors

PersonTokensPropCommitsCommitProp
Gao Feng24100.00%1100.00%
Total24100.00%1100.00%


static bool udp_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; }

Contributors

PersonTokensPropCommitsCommitProp
Yasuyuki Kozakai7683.52%120.00%
Jan Engelhardt88.79%240.00%
Eric W. Biedermann55.49%120.00%
Gao Feng22.20%120.00%
Total91100.00%5100.00%


static bool udp_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; }

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PersonTokensPropCommitsCommitProp
Yasuyuki Kozakai5896.67%150.00%
Jan Engelhardt23.33%150.00%
Total60100.00%2100.00%

/* Print out the per-protocol part of the tuple. */
static void udp_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)); }

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PersonTokensPropCommitsCommitProp
Yasuyuki Kozakai4896.00%150.00%
Joe Perches24.00%150.00%
Total50100.00%2100.00%


static unsigned int *udp_get_timeouts(struct net *net) { return udp_pernet(net)->timeouts; }

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PersonTokensPropCommitsCommitProp
Pablo Neira Ayuso1571.43%150.00%
Gao Feng628.57%150.00%
Total21100.00%2100.00%

/* Returns verdict for packet, and may modify conntracktype */
static int udp_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[UDP_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[UDP_CT_UNREPLIED]); } return NF_ACCEPT; }

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PersonTokensPropCommitsCommitProp
Yasuyuki Kozakai8478.50%114.29%
Pablo Neira Ayuso1514.02%228.57%
Patrick McHardy65.61%228.57%
Alexey Dobriyan10.93%114.29%
Jan Engelhardt10.93%114.29%
Total107100.00%7100.00%

/* Called when a new connection for this protocol found. */
static bool udp_new(struct nf_conn *ct, const struct sk_buff *skb, unsigned int dataoff, unsigned int *timeouts) { return true; }

Contributors

PersonTokensPropCommitsCommitProp
Yasuyuki Kozakai2172.41%125.00%
Pablo Neira Ayuso517.24%125.00%
Jan Engelhardt26.90%125.00%
Patrick McHardy13.45%125.00%
Total29100.00%4100.00%

#ifdef CONFIG_NF_CT_PROTO_UDPLITE
static int udplite_error(struct net *net, struct nf_conn *tmpl, struct sk_buff *skb, unsigned int dataoff, u8 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) { 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; }

Contributors

PersonTokensPropCommitsCommitProp
Yasuyuki Kozakai17961.72%19.09%
Florian Westphal7124.48%19.09%
Alexey Dobriyan165.52%327.27%
Patrick McHardy134.48%436.36%
Gao Feng62.07%19.09%
Jan Engelhardt51.72%19.09%
Total290100.00%11100.00%

#endif
static int udp_error(struct net *net, struct nf_conn *tmpl, struct sk_buff *skb, unsigned int dataoff, u_int8_t pf, unsigned int hooknum) { unsigned int udplen = skb->len - dataoff; const struct udphdr *hdr; struct udphdr _hdr; /* Header is too small? */ hdr = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr); if (hdr == NULL) { if (LOG_INVALID(net, IPPROTO_UDP)) nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL, "nf_ct_udp: short packet "); return -NF_ACCEPT; } /* Truncated/malformed packets */ if (ntohs(hdr->len) > udplen || ntohs(hdr->len) < sizeof(*hdr)) { if (LOG_INVALID(net, IPPROTO_UDP)) nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL, "nf_ct_udp: truncated/malformed packet "); return -NF_ACCEPT; } /* Packet with no checksum */ if (!hdr->check) return NF_ACCEPT; /* Checksum invalid? Ignore. * We skip checking packets on the outgoing path * because the checksum is assumed to be correct. * FIXME: Source route IP option packets --RR */ if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING && nf_checksum(skb, hooknum, dataoff, IPPROTO_UDP, pf)) { if (LOG_INVALID(net, IPPROTO_UDP)) nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL, "nf_ct_udp: bad UDP checksum "); return -NF_ACCEPT; } return NF_ACCEPT; }

Contributors

PersonTokensPropCommitsCommitProp
Florian Westphal21186.83%133.33%
Pablo Neira Ayuso2610.70%133.33%
Gao Feng62.47%133.33%
Total243100.00%3100.00%

#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) #include <linux/netfilter/nfnetlink.h> #include <linux/netfilter/nfnetlink_cttimeout.h>
static int udp_timeout_nlattr_to_obj(struct nlattr *tb[], struct net *net, void *data) { unsigned int *timeouts = data; struct nf_udp_net *un = udp_pernet(net); /* set default timeouts for UDP. */ timeouts[UDP_CT_UNREPLIED] = un->timeouts[UDP_CT_UNREPLIED]; timeouts[UDP_CT_REPLIED] = un->timeouts[UDP_CT_REPLIED]; if (tb[CTA_TIMEOUT_UDP_UNREPLIED]) { timeouts[UDP_CT_UNREPLIED] = ntohl(nla_get_be32(tb[CTA_TIMEOUT_UDP_UNREPLIED])) * HZ; } if (tb[CTA_TIMEOUT_UDP_REPLIED]) { timeouts[UDP_CT_REPLIED] = ntohl(nla_get_be32(tb[CTA_TIMEOUT_UDP_REPLIED])) * HZ; } return 0; }

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PersonTokensPropCommitsCommitProp
Florian Westphal9881.67%133.33%
Pablo Neira Ayuso2016.67%133.33%
David S. Miller21.67%133.33%
Total120100.00%3100.00%


static int udp_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data) { const unsigned int *timeouts = data; if (nla_put_be32(skb, CTA_TIMEOUT_UDP_UNREPLIED, htonl(timeouts[UDP_CT_UNREPLIED] / HZ)) || nla_put_be32(skb, CTA_TIMEOUT_UDP_REPLIED, htonl(timeouts[UDP_CT_REPLIED] / HZ))) goto nla_put_failure; return 0; nla_put_failure: return -ENOSPC; }

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PersonTokensPropCommitsCommitProp
Florian Westphal72100.00%1100.00%
Total72100.00%1100.00%

static const struct nla_policy udp_timeout_nla_policy[CTA_TIMEOUT_UDP_MAX+1] = { [CTA_TIMEOUT_UDP_UNREPLIED] = { .type = NLA_U32 }, [CTA_TIMEOUT_UDP_REPLIED] = { .type = NLA_U32 }, }; #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ #ifdef CONFIG_SYSCTL static struct ctl_table udp_sysctl_table[] = { { .procname = "nf_conntrack_udp_timeout", .maxlen = sizeof(unsigned int), .mode = 0644, .proc_handler = proc_dointvec_jiffies, }, { .procname = "nf_conntrack_udp_timeout_stream", .maxlen = sizeof(unsigned int), .mode = 0644, .proc_handler = proc_dointvec_jiffies, }, { } }; #endif /* CONFIG_SYSCTL */
static int udp_kmemdup_sysctl_table(struct nf_proto_net *pn, struct nf_udp_net *un) { #ifdef CONFIG_SYSCTL if (pn->ctl_table) return 0; pn->ctl_table = kmemdup(udp_sysctl_table, sizeof(udp_sysctl_table), GFP_KERNEL); if (!pn->ctl_table) return -ENOMEM; pn->ctl_table[0].data = &un->timeouts[UDP_CT_UNREPLIED]; pn->ctl_table[1].data = &un->timeouts[UDP_CT_REPLIED]; #endif return 0; }

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PersonTokensPropCommitsCommitProp
Florian Westphal94100.00%1100.00%
Total94100.00%1100.00%


static int udp_init_net(struct net *net, u_int16_t proto) { struct nf_udp_net *un = udp_pernet(net); struct nf_proto_net *pn = &un->pn; if (!pn->users) { int i; for (i = 0; i < UDP_CT_MAX; i++) un->timeouts[i] = udp_timeouts[i]; } return udp_kmemdup_sysctl_table(pn, un); }

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PersonTokensPropCommitsCommitProp
Florian Westphal79100.00%1100.00%
Total79100.00%1100.00%


static struct nf_proto_net *udp_get_net_proto(struct net *net) { return &net->ct.nf_ct_proto.udp.pn; }

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PersonTokensPropCommitsCommitProp
Florian Westphal25100.00%1100.00%
Total25100.00%1100.00%

struct nf_conntrack_l4proto nf_conntrack_l4proto_udp4 __read_mostly = { .l3proto = PF_INET, .l4proto = IPPROTO_UDP, .name = "udp", .allow_clash = true, .pkt_to_tuple = udp_pkt_to_tuple, .invert_tuple = udp_invert_tuple, .print_tuple = udp_print_tuple, .packet = udp_packet, .get_timeouts = udp_get_timeouts, .new = udp_new, .error = udp_error, #if IS_ENABLED(CONFIG_NF_CT_NETLINK) .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size, .nla_policy = nf_ct_port_nla_policy, #endif #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) .ctnl_timeout = { .nlattr_to_obj = udp_timeout_nlattr_to_obj, .obj_to_nlattr = udp_timeout_obj_to_nlattr, .nlattr_max = CTA_TIMEOUT_UDP_MAX, .obj_size = sizeof(unsigned int) * CTA_TIMEOUT_UDP_MAX, .nla_policy = udp_timeout_nla_policy, }, #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ .init_net = udp_init_net, .get_net_proto = udp_get_net_proto, }; EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_udp4); #ifdef CONFIG_NF_CT_PROTO_UDPLITE struct nf_conntrack_l4proto nf_conntrack_l4proto_udplite4 __read_mostly = { .l3proto = PF_INET, .l4proto = IPPROTO_UDPLITE, .name = "udplite", .allow_clash = true, .pkt_to_tuple = udp_pkt_to_tuple, .invert_tuple = udp_invert_tuple, .print_tuple = udp_print_tuple, .packet = udp_packet, .get_timeouts = udp_get_timeouts, .new = udp_new, .error = udplite_error, #if IS_ENABLED(CONFIG_NF_CT_NETLINK) .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size, .nla_policy = nf_ct_port_nla_policy, #endif #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) .ctnl_timeout = { .nlattr_to_obj = udp_timeout_nlattr_to_obj, .obj_to_nlattr = udp_timeout_obj_to_nlattr, .nlattr_max = CTA_TIMEOUT_UDP_MAX, .obj_size = sizeof(unsigned int) * CTA_TIMEOUT_UDP_MAX, .nla_policy = udp_timeout_nla_policy, }, #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ .init_net = udp_init_net, .get_net_proto = udp_get_net_proto, }; EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_udplite4); #endif struct nf_conntrack_l4proto nf_conntrack_l4proto_udp6 __read_mostly = { .l3proto = PF_INET6, .l4proto = IPPROTO_UDP, .name = "udp", .allow_clash = true, .pkt_to_tuple = udp_pkt_to_tuple, .invert_tuple = udp_invert_tuple, .print_tuple = udp_print_tuple, .packet = udp_packet, .get_timeouts = udp_get_timeouts, .new = udp_new, .error = udp_error, #if IS_ENABLED(CONFIG_NF_CT_NETLINK) .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size, .nla_policy = nf_ct_port_nla_policy, #endif #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) .ctnl_timeout = { .nlattr_to_obj = udp_timeout_nlattr_to_obj, .obj_to_nlattr = udp_timeout_obj_to_nlattr, .nlattr_max = CTA_TIMEOUT_UDP_MAX, .obj_size = sizeof(unsigned int) * CTA_TIMEOUT_UDP_MAX, .nla_policy = udp_timeout_nla_policy, }, #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ .init_net = udp_init_net, .get_net_proto = udp_get_net_proto, }; EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_udp6); #ifdef CONFIG_NF_CT_PROTO_UDPLITE struct nf_conntrack_l4proto nf_conntrack_l4proto_udplite6 __read_mostly = { .l3proto = PF_INET6, .l4proto = IPPROTO_UDPLITE, .name = "udplite", .allow_clash = true, .pkt_to_tuple = udp_pkt_to_tuple, .invert_tuple = udp_invert_tuple, .print_tuple = udp_print_tuple, .packet = udp_packet, .get_timeouts = udp_get_timeouts, .new = udp_new, .error = udplite_error, #if IS_ENABLED(CONFIG_NF_CT_NETLINK) .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr, .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple, .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size, .nla_policy = nf_ct_port_nla_policy, #endif #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) .ctnl_timeout = { .nlattr_to_obj = udp_timeout_nlattr_to_obj, .obj_to_nlattr = udp_timeout_obj_to_nlattr, .nlattr_max = CTA_TIMEOUT_UDP_MAX, .obj_size = sizeof(unsigned int) * CTA_TIMEOUT_UDP_MAX, .nla_policy = udp_timeout_nla_policy, }, #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */ .init_net = udp_init_net, .get_net_proto = udp_get_net_proto, }; EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_udplite6); #endif

Overall Contributors

PersonTokensPropCommitsCommitProp
Florian Westphal103048.61%12.38%
Yasuyuki Kozakai60828.69%12.38%
Pablo Neira Ayuso26212.36%614.29%
Patrick McHardy813.82%1433.33%
Gao Feng683.21%511.90%
Jan Engelhardt180.85%37.14%
Alexey Dobriyan170.80%49.52%
Holger Eitzenberger100.47%12.38%
Martin Josefsson80.38%24.76%
Christoph Paasch60.28%12.38%
Eric W. Biedermann50.24%12.38%
Igor Maravić20.09%12.38%
David S. Miller20.09%12.38%
Joe Perches20.09%12.38%
Total2119100.00%42100.00%
Directory: net/netfilter
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