Release 4.11 net/ipv4/netfilter/nf_conntrack_proto_icmp.c
/* (C) 1999-2001 Paul `Rusty' Russell
* (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
* (C) 2006-2010 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/netfilter.h>
#include <linux/in.h>
#include <linux/icmp.h>
#include <linux/seq_file.h>
#include <net/ip.h>
#include <net/checksum.h>
#include <linux/netfilter_ipv4.h>
#include <net/netfilter/nf_conntrack_tuple.h>
#include <net/netfilter/nf_conntrack_l4proto.h>
#include <net/netfilter/nf_conntrack_core.h>
#include <net/netfilter/nf_conntrack_zones.h>
#include <net/netfilter/nf_log.h>
static unsigned int nf_ct_icmp_timeout __read_mostly = 30*HZ;
static inline struct nf_icmp_net *icmp_pernet(struct net *net)
{
return &net->ct.nf_ct_proto.icmp;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Gao Feng | 24 | 100.00% | 1 | 100.00% |
Total | 24 | 100.00% | 1 | 100.00% |
static bool icmp_pkt_to_tuple(const struct sk_buff *skb, unsigned int dataoff,
struct net *net, struct nf_conntrack_tuple *tuple)
{
const struct icmphdr *hp;
struct icmphdr _hdr;
hp = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
if (hp == NULL)
return false;
tuple->dst.u.icmp.type = hp->type;
tuple->src.u.icmp.id = hp->un.echo.id;
tuple->dst.u.icmp.code = hp->code;
return true;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Yasuyuki Kozakai | 98 | 88.29% | 1 | 25.00% |
Jan Engelhardt | 8 | 7.21% | 2 | 50.00% |
Eric W. Biedermann | 5 | 4.50% | 1 | 25.00% |
Total | 111 | 100.00% | 4 | 100.00% |
/* Add 1; spaces filled with 0. */
static const u_int8_t invmap[] = {
[ICMP_ECHO] = ICMP_ECHOREPLY + 1,
[ICMP_ECHOREPLY] = ICMP_ECHO + 1,
[ICMP_TIMESTAMP] = ICMP_TIMESTAMPREPLY + 1,
[ICMP_TIMESTAMPREPLY] = ICMP_TIMESTAMP + 1,
[ICMP_INFO_REQUEST] = ICMP_INFO_REPLY + 1,
[ICMP_INFO_REPLY] = ICMP_INFO_REQUEST + 1,
[ICMP_ADDRESS] = ICMP_ADDRESSREPLY + 1,
[ICMP_ADDRESSREPLY] = ICMP_ADDRESS + 1
};
static bool icmp_invert_tuple(struct nf_conntrack_tuple *tuple,
const struct nf_conntrack_tuple *orig)
{
if (orig->dst.u.icmp.type >= sizeof(invmap) ||
!invmap[orig->dst.u.icmp.type])
return false;
tuple->src.u.icmp.id = orig->src.u.icmp.id;
tuple->dst.u.icmp.type = invmap[orig->dst.u.icmp.type] - 1;
tuple->dst.u.icmp.code = orig->dst.u.icmp.code;
return true;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Yasuyuki Kozakai | 101 | 84.87% | 1 | 33.33% |
Pablo Neira Ayuso | 15 | 12.61% | 1 | 33.33% |
Jan Engelhardt | 3 | 2.52% | 1 | 33.33% |
Total | 119 | 100.00% | 3 | 100.00% |
/* Print out the per-protocol part of the tuple. */
static void icmp_print_tuple(struct seq_file *s,
const struct nf_conntrack_tuple *tuple)
{
seq_printf(s, "type=%u code=%u id=%u ",
tuple->dst.u.icmp.type,
tuple->dst.u.icmp.code,
ntohs(tuple->src.u.icmp.id));
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Yasuyuki Kozakai | 55 | 96.49% | 1 | 50.00% |
Joe Perches | 2 | 3.51% | 1 | 50.00% |
Total | 57 | 100.00% | 2 | 100.00% |
static unsigned int *icmp_get_timeouts(struct net *net)
{
return &icmp_pernet(net)->timeout;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Pablo Neira Ayuso | 16 | 72.73% | 1 | 50.00% |
Gao Feng | 6 | 27.27% | 1 | 50.00% |
Total | 22 | 100.00% | 2 | 100.00% |
/* Returns verdict for packet, or -1 for invalid. */
static int icmp_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)
{
/* Do not immediately delete the connection after the first
successful reply to avoid excessive conntrackd traffic
and also to handle correctly ICMP echo reply duplicates. */
nf_ct_refresh_acct(ct, ctinfo, skb, *timeout);
return NF_ACCEPT;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Yasuyuki Kozakai | 44 | 83.02% | 1 | 25.00% |
Pablo Neira Ayuso | 7 | 13.21% | 1 | 25.00% |
Jan Yenya Kasprzak | 1 | 1.89% | 1 | 25.00% |
Jan Engelhardt | 1 | 1.89% | 1 | 25.00% |
Total | 53 | 100.00% | 4 | 100.00% |
/* Called when a new connection for this protocol found. */
static bool icmp_new(struct nf_conn *ct, const struct sk_buff *skb,
unsigned int dataoff, unsigned int *timeouts)
{
static const u_int8_t valid_new[] = {
[ICMP_ECHO] = 1,
[ICMP_TIMESTAMP] = 1,
[ICMP_INFO_REQUEST] = 1,
[ICMP_ADDRESS] = 1
};
if (ct->tuplehash[0].tuple.dst.u.icmp.type >= sizeof(valid_new) ||
!valid_new[ct->tuplehash[0].tuple.dst.u.icmp.type]) {
/* Can't create a new ICMP `conn' with this. */
pr_debug("icmp: can't create new conn with type %u\n",
ct->tuplehash[0].tuple.dst.u.icmp.type);
nf_ct_dump_tuple_ip(&ct->tuplehash[0].tuple);
return false;
}
return true;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Yasuyuki Kozakai | 131 | 89.12% | 1 | 14.29% |
Patrick McHardy | 6 | 4.08% | 2 | 28.57% |
Pablo Neira Ayuso | 6 | 4.08% | 2 | 28.57% |
Jan Engelhardt | 4 | 2.72% | 2 | 28.57% |
Total | 147 | 100.00% | 7 | 100.00% |
/* Returns conntrack if it dealt with ICMP, and filled in skb fields */
static int
icmp_error_message(struct net *net, struct nf_conn *tmpl, struct sk_buff *skb,
unsigned int hooknum)
{
struct nf_conntrack_tuple innertuple, origtuple;
const struct nf_conntrack_l4proto *innerproto;
const struct nf_conntrack_tuple_hash *h;
const struct nf_conntrack_zone *zone;
enum ip_conntrack_info ctinfo;
struct nf_conntrack_zone tmp;
NF_CT_ASSERT(!skb_nfct(skb));
zone = nf_ct_zone_tmpl(tmpl, skb, &tmp);
/* Are they talking about one of our connections? */
if (!nf_ct_get_tuplepr(skb,
skb_network_offset(skb) + ip_hdrlen(skb)
+ sizeof(struct icmphdr),
PF_INET, net, &origtuple)) {
pr_debug("icmp_error_message: failed to get tuple\n");
return -NF_ACCEPT;
}
/* rcu_read_lock()ed by nf_hook_thresh */
innerproto = __nf_ct_l4proto_find(PF_INET, origtuple.dst.protonum);
/* Ordinarily, we'd expect the inverted tupleproto, but it's
been preserved inside the ICMP. */
if (!nf_ct_invert_tuple(&innertuple, &origtuple,
&nf_conntrack_l3proto_ipv4, innerproto)) {
pr_debug("icmp_error_message: no match\n");
return -NF_ACCEPT;
}
ctinfo = IP_CT_RELATED;
h = nf_conntrack_find_get(net, zone, &innertuple);
if (!h) {
pr_debug("icmp_error_message: no match\n");
return -NF_ACCEPT;
}
if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY)
ctinfo += IP_CT_IS_REPLY;
/* Update skb to refer to this connection */
nf_ct_set(skb, nf_ct_tuplehash_to_ctrack(h), ctinfo);
return NF_ACCEPT;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Yasuyuki Kozakai | 161 | 71.56% | 2 | 11.76% |
Daniel Borkmann | 20 | 8.89% | 2 | 11.76% |
Florian Westphal | 13 | 5.78% | 3 | 17.65% |
Patrick McHardy | 12 | 5.33% | 2 | 11.76% |
Alexey Dobriyan | 8 | 3.56% | 2 | 11.76% |
Arnaldo Carvalho de Melo | 3 | 1.33% | 1 | 5.88% |
Martin Josefsson | 2 | 0.89% | 1 | 5.88% |
Jan Engelhardt | 2 | 0.89% | 1 | 5.88% |
Eric W. Biedermann | 2 | 0.89% | 1 | 5.88% |
Aaron Conole | 1 | 0.44% | 1 | 5.88% |
Hideaki Yoshifuji / 吉藤英明 | 1 | 0.44% | 1 | 5.88% |
Total | 225 | 100.00% | 17 | 100.00% |
/* Small and modified version of icmp_rcv */
static int
icmp_error(struct net *net, struct nf_conn *tmpl,
struct sk_buff *skb, unsigned int dataoff,
u8 pf, unsigned int hooknum)
{
const struct icmphdr *icmph;
struct icmphdr _ih;
/* Not enough header? */
icmph = skb_header_pointer(skb, ip_hdrlen(skb), sizeof(_ih), &_ih);
if (icmph == NULL) {
if (LOG_INVALID(net, IPPROTO_ICMP))
nf_log_packet(net, PF_INET, 0, skb, NULL, NULL,
NULL, "nf_ct_icmp: short packet ");
return -NF_ACCEPT;
}
/* See ip_conntrack_proto_tcp.c */
if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING &&
nf_ip_checksum(skb, hooknum, dataoff, 0)) {
if (LOG_INVALID(net, IPPROTO_ICMP))
nf_log_packet(net, PF_INET, 0, skb, NULL, NULL, NULL,
"nf_ct_icmp: bad HW ICMP checksum ");
return -NF_ACCEPT;
}
/*
* 18 is the highest 'known' ICMP type. Anything else is a mystery
*
* RFC 1122: 3.2.2 Unknown ICMP messages types MUST be silently
* discarded.
*/
if (icmph->type > NR_ICMP_TYPES) {
if (LOG_INVALID(net, IPPROTO_ICMP))
nf_log_packet(net, PF_INET, 0, skb, NULL, NULL, NULL,
"nf_ct_icmp: invalid ICMP type ");
return -NF_ACCEPT;
}
/* Need to track icmp error message? */
if (icmph->type != ICMP_DEST_UNREACH &&
icmph->type != ICMP_SOURCE_QUENCH &&
icmph->type != ICMP_TIME_EXCEEDED &&
icmph->type != ICMP_PARAMETERPROB &&
icmph->type != ICMP_REDIRECT)
return NF_ACCEPT;
return icmp_error_message(net, tmpl, skb, hooknum);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Yasuyuki Kozakai | 204 | 80.95% | 1 | 7.69% |
Alexey Dobriyan | 18 | 7.14% | 3 | 23.08% |
Patrick McHardy | 15 | 5.95% | 5 | 38.46% |
Gao Feng | 6 | 2.38% | 1 | 7.69% |
Jan Engelhardt | 5 | 1.98% | 1 | 7.69% |
Arnaldo Carvalho de Melo | 3 | 1.19% | 1 | 7.69% |
Florian Westphal | 1 | 0.40% | 1 | 7.69% |
Total | 252 | 100.00% | 13 | 100.00% |
#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/nfnetlink_conntrack.h>
static int icmp_tuple_to_nlattr(struct sk_buff *skb,
const struct nf_conntrack_tuple *t)
{
if (nla_put_be16(skb, CTA_PROTO_ICMP_ID, t->src.u.icmp.id) ||
nla_put_u8(skb, CTA_PROTO_ICMP_TYPE, t->dst.u.icmp.type) ||
nla_put_u8(skb, CTA_PROTO_ICMP_CODE, t->dst.u.icmp.code))
goto nla_put_failure;
return 0;
nla_put_failure:
return -1;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Pablo Neira Ayuso | 69 | 84.15% | 1 | 25.00% |
David S. Miller | 11 | 13.41% | 1 | 25.00% |
Patrick McHardy | 2 | 2.44% | 2 | 50.00% |
Total | 82 | 100.00% | 4 | 100.00% |
static const struct nla_policy icmp_nla_policy[CTA_PROTO_MAX+1] = {
[CTA_PROTO_ICMP_TYPE] = { .type = NLA_U8 },
[CTA_PROTO_ICMP_CODE] = { .type = NLA_U8 },
[CTA_PROTO_ICMP_ID] = { .type = NLA_U16 },
};
static int icmp_nlattr_to_tuple(struct nlattr *tb[],
struct nf_conntrack_tuple *tuple)
{
if (!tb[CTA_PROTO_ICMP_TYPE] ||
!tb[CTA_PROTO_ICMP_CODE] ||
!tb[CTA_PROTO_ICMP_ID])
return -EINVAL;
tuple->dst.u.icmp.type = nla_get_u8(tb[CTA_PROTO_ICMP_TYPE]);
tuple->dst.u.icmp.code = nla_get_u8(tb[CTA_PROTO_ICMP_CODE]);
tuple->src.u.icmp.id = nla_get_be16(tb[CTA_PROTO_ICMP_ID]);
if (tuple->dst.u.icmp.type >= sizeof(invmap) ||
!invmap[tuple->dst.u.icmp.type])
return -EINVAL;
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Pablo Neira Ayuso | 128 | 96.24% | 1 | 25.00% |
Patrick McHardy | 5 | 3.76% | 3 | 75.00% |
Total | 133 | 100.00% | 4 | 100.00% |
static int icmp_nlattr_tuple_size(void)
{
return nla_policy_len(icmp_nla_policy, CTA_PROTO_MAX + 1);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Holger Eitzenberger | 18 | 100.00% | 1 | 100.00% |
Total | 18 | 100.00% | 1 | 100.00% |
#endif
#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/nfnetlink_cttimeout.h>
static int icmp_timeout_nlattr_to_obj(struct nlattr *tb[],
struct net *net, void *data)
{
unsigned int *timeout = data;
struct nf_icmp_net *in = icmp_pernet(net);
if (tb[CTA_TIMEOUT_ICMP_TIMEOUT]) {
*timeout =
ntohl(nla_get_be32(tb[CTA_TIMEOUT_ICMP_TIMEOUT])) * HZ;
} else {
/* Set default ICMP timeout. */
*timeout = in->timeout;
}
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Pablo Neira Ayuso | 59 | 76.62% | 1 | 50.00% |
Gao Feng | 18 | 23.38% | 1 | 50.00% |
Total | 77 | 100.00% | 2 | 100.00% |
static int
icmp_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data)
{
const unsigned int *timeout = data;
if (nla_put_be32(skb, CTA_TIMEOUT_ICMP_TIMEOUT, htonl(*timeout / HZ)))
goto nla_put_failure;
return 0;
nla_put_failure:
return -ENOSPC;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Pablo Neira Ayuso | 46 | 86.79% | 1 | 50.00% |
David S. Miller | 7 | 13.21% | 1 | 50.00% |
Total | 53 | 100.00% | 2 | 100.00% |
static const struct nla_policy
icmp_timeout_nla_policy[CTA_TIMEOUT_ICMP_MAX+1] = {
[CTA_TIMEOUT_ICMP_TIMEOUT] = { .type = NLA_U32 },
};
#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
#ifdef CONFIG_SYSCTL
static struct ctl_table icmp_sysctl_table[] = {
{
.procname = "nf_conntrack_icmp_timeout",
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
{ }
};
#endif /* CONFIG_SYSCTL */
static int icmp_kmemdup_sysctl_table(struct nf_proto_net *pn,
struct nf_icmp_net *in)
{
#ifdef CONFIG_SYSCTL
pn->ctl_table = kmemdup(icmp_sysctl_table,
sizeof(icmp_sysctl_table),
GFP_KERNEL);
if (!pn->ctl_table)
return -ENOMEM;
pn->ctl_table[0].data = &in->timeout;
#endif
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Gao Feng | 65 | 100.00% | 3 | 100.00% |
Total | 65 | 100.00% | 3 | 100.00% |
static int icmp_init_net(struct net *net, u_int16_t proto)
{
struct nf_icmp_net *in = icmp_pernet(net);
struct nf_proto_net *pn = &in->pn;
in->timeout = nf_ct_icmp_timeout;
return icmp_kmemdup_sysctl_table(pn, in);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Gao Feng | 48 | 100.00% | 1 | 100.00% |
Total | 48 | 100.00% | 1 | 100.00% |
static struct nf_proto_net *icmp_get_net_proto(struct net *net)
{
return &net->ct.nf_ct_proto.icmp.pn;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Pablo Neira Ayuso | 25 | 100.00% | 1 | 100.00% |
Total | 25 | 100.00% | 1 | 100.00% |
struct nf_conntrack_l4proto nf_conntrack_l4proto_icmp __read_mostly =
{
.l3proto = PF_INET,
.l4proto = IPPROTO_ICMP,
.name = "icmp",
.pkt_to_tuple = icmp_pkt_to_tuple,
.invert_tuple = icmp_invert_tuple,
.print_tuple = icmp_print_tuple,
.packet = icmp_packet,
.get_timeouts = icmp_get_timeouts,
.new = icmp_new,
.error = icmp_error,
.destroy = NULL,
.me = NULL,
#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
.tuple_to_nlattr = icmp_tuple_to_nlattr,
.nlattr_tuple_size = icmp_nlattr_tuple_size,
.nlattr_to_tuple = icmp_nlattr_to_tuple,
.nla_policy = icmp_nla_policy,
#endif
#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
.ctnl_timeout = {
.nlattr_to_obj = icmp_timeout_nlattr_to_obj,
.obj_to_nlattr = icmp_timeout_obj_to_nlattr,
.nlattr_max = CTA_TIMEOUT_ICMP_MAX,
.obj_size = sizeof(unsigned int),
.nla_policy = icmp_timeout_nla_policy,
},
#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
.init_net = icmp_init_net,
.get_net_proto = icmp_get_net_proto,
};
Overall Contributors
Person | Tokens | Prop | Commits | CommitProp |
Yasuyuki Kozakai | 970 | 50.23% | 2 | 3.85% |
Pablo Neira Ayuso | 514 | 26.62% | 4 | 7.69% |
Gao Feng | 172 | 8.91% | 5 | 9.62% |
Patrick McHardy | 123 | 6.37% | 16 | 30.77% |
Alexey Dobriyan | 26 | 1.35% | 4 | 7.69% |
Jan Engelhardt | 23 | 1.19% | 4 | 7.69% |
Holger Eitzenberger | 23 | 1.19% | 1 | 1.92% |
Daniel Borkmann | 20 | 1.04% | 2 | 3.85% |
David S. Miller | 18 | 0.93% | 1 | 1.92% |
Florian Westphal | 14 | 0.73% | 3 | 5.77% |
Eric W. Biedermann | 8 | 0.41% | 2 | 3.85% |
Martin Josefsson | 6 | 0.31% | 1 | 1.92% |
Arnaldo Carvalho de Melo | 6 | 0.31% | 1 | 1.92% |
Joe Perches | 2 | 0.10% | 1 | 1.92% |
Duan Jiong | 2 | 0.10% | 1 | 1.92% |
Jan Yenya Kasprzak | 1 | 0.05% | 1 | 1.92% |
Aaron Conole | 1 | 0.05% | 1 | 1.92% |
Brian Haley | 1 | 0.05% | 1 | 1.92% |
Hideaki Yoshifuji / 吉藤英明 | 1 | 0.05% | 1 | 1.92% |
Total | 1931 | 100.00% | 52 | 100.00% |
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.