2018-06-29 05:46:51 +00:00
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// SPDX-License-Identifier: GPL-2.0
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2006-11-29 01:35:03 +00:00
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#include <linux/types.h>
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#include <linux/netfilter.h>
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#include <linux/module.h>
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include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 08:04:11 +00:00
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#include <linux/slab.h>
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2006-11-29 01:35:17 +00:00
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#include <linux/mutex.h>
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2006-11-29 01:35:03 +00:00
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#include <linux/vmalloc.h>
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#include <linux/stddef.h>
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#include <linux/err.h>
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#include <linux/percpu.h>
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#include <linux/notifier.h>
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#include <linux/kernel.h>
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#include <linux/netdevice.h>
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#include <net/netfilter/nf_conntrack.h>
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2006-11-29 01:35:06 +00:00
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#include <net/netfilter/nf_conntrack_l4proto.h>
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2006-11-29 01:35:03 +00:00
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#include <net/netfilter/nf_conntrack_core.h>
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2019-05-29 11:25:36 +00:00
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#include <net/netfilter/nf_conntrack_bridge.h>
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2017-10-11 08:47:40 +00:00
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#include <net/netfilter/nf_log.h>
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2006-11-29 01:35:03 +00:00
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2018-06-29 05:46:51 +00:00
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#include <linux/ip.h>
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#include <linux/icmp.h>
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#include <linux/sysctl.h>
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#include <net/route.h>
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#include <net/ip.h>
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#include <linux/netfilter_ipv4.h>
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#include <linux/netfilter_ipv6.h>
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#include <linux/netfilter_ipv6/ip6_tables.h>
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#include <net/netfilter/nf_conntrack_helper.h>
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#include <net/netfilter/nf_conntrack_zones.h>
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#include <net/netfilter/nf_conntrack_seqadj.h>
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#include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
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#include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
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#include <net/netfilter/nf_nat_helper.h>
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#include <net/netfilter/ipv4/nf_defrag_ipv4.h>
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#include <net/netfilter/ipv6/nf_defrag_ipv6.h>
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#include <linux/ipv6.h>
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#include <linux/in6.h>
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#include <net/ipv6.h>
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#include <net/inet_frag.h>
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2007-03-14 23:37:52 +00:00
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static DEFINE_MUTEX(nf_ct_proto_mutex);
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2006-11-29 01:35:17 +00:00
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2007-03-14 23:37:52 +00:00
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#ifdef CONFIG_SYSCTL
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2021-06-16 20:06:19 +00:00
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__printf(4, 5)
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2017-10-11 08:47:40 +00:00
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void nf_l4proto_log_invalid(const struct sk_buff *skb,
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2021-06-16 20:06:19 +00:00
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const struct nf_hook_state *state,
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u8 protonum,
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2017-10-11 08:47:40 +00:00
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const char *fmt, ...)
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{
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2021-06-16 20:06:19 +00:00
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struct net *net = state->net;
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2017-10-11 08:47:40 +00:00
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struct va_format vaf;
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va_list args;
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2019-04-17 16:49:44 +00:00
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if (net->ct.sysctl_log_invalid != protonum &&
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2017-10-11 08:47:40 +00:00
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net->ct.sysctl_log_invalid != IPPROTO_RAW)
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return;
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va_start(args, fmt);
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vaf.fmt = fmt;
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vaf.va = &args;
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2021-06-16 20:06:19 +00:00
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nf_log_packet(net, state->pf, 0, skb, state->in, state->out,
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NULL, "nf_ct_proto_%d: %pV ", protonum, &vaf);
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2017-10-11 08:47:40 +00:00
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va_end(args);
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}
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EXPORT_SYMBOL_GPL(nf_l4proto_log_invalid);
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2017-10-11 08:47:41 +00:00
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2021-06-16 20:06:19 +00:00
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__printf(4, 5)
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2017-10-11 08:47:41 +00:00
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void nf_ct_l4proto_log_invalid(const struct sk_buff *skb,
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const struct nf_conn *ct,
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2021-06-16 20:06:19 +00:00
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const struct nf_hook_state *state,
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2017-10-11 08:47:41 +00:00
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const char *fmt, ...)
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{
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struct va_format vaf;
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struct net *net;
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va_list args;
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net = nf_ct_net(ct);
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if (likely(net->ct.sysctl_log_invalid == 0))
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return;
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va_start(args, fmt);
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vaf.fmt = fmt;
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vaf.va = &args;
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2021-06-16 20:06:19 +00:00
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nf_l4proto_log_invalid(skb, state,
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2017-10-11 08:47:41 +00:00
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nf_ct_protonum(ct), "%pV", &vaf);
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va_end(args);
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}
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EXPORT_SYMBOL_GPL(nf_ct_l4proto_log_invalid);
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2006-11-29 01:35:17 +00:00
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#endif
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2019-01-15 21:03:47 +00:00
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const struct nf_conntrack_l4proto *nf_ct_l4proto_find(u8 l4proto)
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2006-11-29 01:35:03 +00:00
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{
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2019-01-15 21:03:47 +00:00
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switch (l4proto) {
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case IPPROTO_UDP: return &nf_conntrack_l4proto_udp;
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case IPPROTO_TCP: return &nf_conntrack_l4proto_tcp;
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case IPPROTO_ICMP: return &nf_conntrack_l4proto_icmp;
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#ifdef CONFIG_NF_CT_PROTO_DCCP
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case IPPROTO_DCCP: return &nf_conntrack_l4proto_dccp;
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#endif
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#ifdef CONFIG_NF_CT_PROTO_SCTP
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case IPPROTO_SCTP: return &nf_conntrack_l4proto_sctp;
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#endif
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#ifdef CONFIG_NF_CT_PROTO_UDPLITE
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case IPPROTO_UDPLITE: return &nf_conntrack_l4proto_udplite;
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#endif
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#ifdef CONFIG_NF_CT_PROTO_GRE
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case IPPROTO_GRE: return &nf_conntrack_l4proto_gre;
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#endif
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#if IS_ENABLED(CONFIG_IPV6)
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case IPPROTO_ICMPV6: return &nf_conntrack_l4proto_icmpv6;
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#endif /* CONFIG_IPV6 */
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2006-11-29 01:35:03 +00:00
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}
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2019-01-15 21:03:47 +00:00
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return &nf_conntrack_l4proto_generic;
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};
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EXPORT_SYMBOL_GPL(nf_ct_l4proto_find);
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2016-11-07 17:31:17 +00:00
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netfilter: bridge: add connection tracking system
This patch adds basic connection tracking support for the bridge,
including initial IPv4 support.
This patch register two hooks to deal with the bridge forwarding path,
one from the bridge prerouting hook to call nf_conntrack_in(); and
another from the bridge postrouting hook to confirm the entry.
The conntrack bridge prerouting hook defragments packets before passing
them to nf_conntrack_in() to look up for an existing entry, otherwise a
new entry is allocated and it is attached to the skbuff. The conntrack
bridge postrouting hook confirms new conntrack entries, ie. if this is
the first packet seen, then it adds the entry to the hashtable and (if
needed) it refragments the skbuff into the original fragments, leaving
the geometry as is if possible. Exceptions are linearized skbuffs, eg.
skbuffs that are passed up to nfqueue and conntrack helpers, as well as
cloned skbuff for the local delivery (eg. tcpdump), also in case of
bridge port flooding (cloned skbuff too).
The packet defragmentation is done through the ip_defrag() call. This
forces us to save the bridge control buffer, reset the IP control buffer
area and then restore it after call. This function also bumps the IP
fragmentation statistics, it would be probably desiderable to have
independent statistics for the bridge defragmentation/refragmentation.
The maximum fragment length is stored in the control buffer and it is
used to refragment the skbuff from the postrouting path.
The new fraglist splitter and fragment transformer APIs are used to
implement the bridge refragmentation code. The br_ip_fragment() function
drops the packet in case the maximum fragment size seen is larger than
the output port MTU.
This patchset follows the principle that conntrack should not drop
packets, so users can do it through policy via invalid state matching.
Like br_netfilter, there is no refragmentation for packets that are
passed up for local delivery, ie. prerouting -> input path. There are
calls to nf_reset() already in several spots in the stack since time ago
already, eg. af_packet, that show that skbuff fraglist handling from the
netif_rx path is supported already.
The helpers are called from the postrouting hook, before confirmation,
from there we may see packet floods to bridge ports. Then, although
unlikely, this may result in exercising the helpers many times for each
clone. It would be good to explore how to pass all the packets in a list
to the conntrack hook to do this handle only once for this case.
Thanks to Florian Westphal for handing me over an initial patchset
version to add support for conntrack bridge.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2019-05-29 11:25:37 +00:00
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unsigned int nf_confirm(struct sk_buff *skb, unsigned int protoff,
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struct nf_conn *ct, enum ip_conntrack_info ctinfo)
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2018-06-29 05:46:51 +00:00
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{
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const struct nf_conn_help *help;
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help = nfct_help(ct);
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2019-01-09 16:19:34 +00:00
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if (help) {
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const struct nf_conntrack_helper *helper;
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int ret;
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/* rcu_read_lock()ed by nf_hook_thresh */
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helper = rcu_dereference(help->helper);
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if (helper) {
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ret = helper->help(skb,
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protoff,
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ct, ctinfo);
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if (ret != NF_ACCEPT)
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return ret;
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}
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}
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2018-06-29 05:46:51 +00:00
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2019-01-09 16:19:34 +00:00
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if (test_bit(IPS_SEQ_ADJUST_BIT, &ct->status) &&
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!nf_is_loopback_packet(skb)) {
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if (!nf_ct_seq_adjust(skb, ct, ctinfo, protoff)) {
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NF_CT_STAT_INC_ATOMIC(nf_ct_net(ct), drop);
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return NF_DROP;
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}
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}
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2018-06-29 05:46:51 +00:00
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2019-01-09 16:19:34 +00:00
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/* We've seen it coming out the other side: confirm it */
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return nf_conntrack_confirm(skb);
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2018-06-29 05:46:51 +00:00
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}
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netfilter: bridge: add connection tracking system
This patch adds basic connection tracking support for the bridge,
including initial IPv4 support.
This patch register two hooks to deal with the bridge forwarding path,
one from the bridge prerouting hook to call nf_conntrack_in(); and
another from the bridge postrouting hook to confirm the entry.
The conntrack bridge prerouting hook defragments packets before passing
them to nf_conntrack_in() to look up for an existing entry, otherwise a
new entry is allocated and it is attached to the skbuff. The conntrack
bridge postrouting hook confirms new conntrack entries, ie. if this is
the first packet seen, then it adds the entry to the hashtable and (if
needed) it refragments the skbuff into the original fragments, leaving
the geometry as is if possible. Exceptions are linearized skbuffs, eg.
skbuffs that are passed up to nfqueue and conntrack helpers, as well as
cloned skbuff for the local delivery (eg. tcpdump), also in case of
bridge port flooding (cloned skbuff too).
The packet defragmentation is done through the ip_defrag() call. This
forces us to save the bridge control buffer, reset the IP control buffer
area and then restore it after call. This function also bumps the IP
fragmentation statistics, it would be probably desiderable to have
independent statistics for the bridge defragmentation/refragmentation.
The maximum fragment length is stored in the control buffer and it is
used to refragment the skbuff from the postrouting path.
The new fraglist splitter and fragment transformer APIs are used to
implement the bridge refragmentation code. The br_ip_fragment() function
drops the packet in case the maximum fragment size seen is larger than
the output port MTU.
This patchset follows the principle that conntrack should not drop
packets, so users can do it through policy via invalid state matching.
Like br_netfilter, there is no refragmentation for packets that are
passed up for local delivery, ie. prerouting -> input path. There are
calls to nf_reset() already in several spots in the stack since time ago
already, eg. af_packet, that show that skbuff fraglist handling from the
netif_rx path is supported already.
The helpers are called from the postrouting hook, before confirmation,
from there we may see packet floods to bridge ports. Then, although
unlikely, this may result in exercising the helpers many times for each
clone. It would be good to explore how to pass all the packets in a list
to the conntrack hook to do this handle only once for this case.
Thanks to Florian Westphal for handing me over an initial patchset
version to add support for conntrack bridge.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2019-05-29 11:25:37 +00:00
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EXPORT_SYMBOL_GPL(nf_confirm);
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2018-06-29 05:46:51 +00:00
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2021-10-25 14:13:59 +00:00
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static bool in_vrf_postrouting(const struct nf_hook_state *state)
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{
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#if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
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if (state->hook == NF_INET_POST_ROUTING &&
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netif_is_l3_master(state->out))
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return true;
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#endif
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return false;
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}
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2018-06-29 05:46:51 +00:00
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static unsigned int ipv4_confirm(void *priv,
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struct sk_buff *skb,
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const struct nf_hook_state *state)
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{
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enum ip_conntrack_info ctinfo;
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2019-01-09 16:19:34 +00:00
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struct nf_conn *ct;
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2018-06-29 05:46:51 +00:00
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ct = nf_ct_get(skb, &ctinfo);
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if (!ct || ctinfo == IP_CT_RELATED_REPLY)
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2019-01-09 16:19:34 +00:00
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return nf_conntrack_confirm(skb);
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2018-06-29 05:46:51 +00:00
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2021-10-25 14:13:59 +00:00
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if (in_vrf_postrouting(state))
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return NF_ACCEPT;
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2019-01-09 16:19:34 +00:00
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return nf_confirm(skb,
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skb_network_offset(skb) + ip_hdrlen(skb),
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ct, ctinfo);
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2018-06-29 05:46:51 +00:00
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}
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static unsigned int ipv4_conntrack_in(void *priv,
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struct sk_buff *skb,
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const struct nf_hook_state *state)
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{
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2018-09-12 13:19:07 +00:00
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return nf_conntrack_in(skb, state);
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2018-06-29 05:46:51 +00:00
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}
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static unsigned int ipv4_conntrack_local(void *priv,
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struct sk_buff *skb,
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const struct nf_hook_state *state)
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{
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if (ip_is_fragment(ip_hdr(skb))) { /* IP_NODEFRAG setsockopt set */
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enum ip_conntrack_info ctinfo;
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struct nf_conn *tmpl;
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tmpl = nf_ct_get(skb, &ctinfo);
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if (tmpl && nf_ct_is_template(tmpl)) {
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/* when skipping ct, clear templates to avoid fooling
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|
|
|
* later targets/matches
|
|
|
|
*/
|
|
|
|
skb->_nfct = 0;
|
|
|
|
nf_ct_put(tmpl);
|
|
|
|
}
|
|
|
|
return NF_ACCEPT;
|
|
|
|
}
|
|
|
|
|
2018-09-12 13:19:07 +00:00
|
|
|
return nf_conntrack_in(skb, state);
|
2018-06-29 05:46:51 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Connection tracking may drop packets, but never alters them, so
|
|
|
|
* make it the first hook.
|
|
|
|
*/
|
|
|
|
static const struct nf_hook_ops ipv4_conntrack_ops[] = {
|
|
|
|
{
|
|
|
|
.hook = ipv4_conntrack_in,
|
|
|
|
.pf = NFPROTO_IPV4,
|
|
|
|
.hooknum = NF_INET_PRE_ROUTING,
|
|
|
|
.priority = NF_IP_PRI_CONNTRACK,
|
|
|
|
},
|
|
|
|
{
|
|
|
|
.hook = ipv4_conntrack_local,
|
|
|
|
.pf = NFPROTO_IPV4,
|
|
|
|
.hooknum = NF_INET_LOCAL_OUT,
|
|
|
|
.priority = NF_IP_PRI_CONNTRACK,
|
|
|
|
},
|
|
|
|
{
|
|
|
|
.hook = ipv4_confirm,
|
|
|
|
.pf = NFPROTO_IPV4,
|
|
|
|
.hooknum = NF_INET_POST_ROUTING,
|
|
|
|
.priority = NF_IP_PRI_CONNTRACK_CONFIRM,
|
|
|
|
},
|
|
|
|
{
|
|
|
|
.hook = ipv4_confirm,
|
|
|
|
.pf = NFPROTO_IPV4,
|
|
|
|
.hooknum = NF_INET_LOCAL_IN,
|
|
|
|
.priority = NF_IP_PRI_CONNTRACK_CONFIRM,
|
|
|
|
},
|
|
|
|
};
|
|
|
|
|
|
|
|
/* Fast function for those who don't want to parse /proc (and I don't
|
|
|
|
* blame them).
|
|
|
|
* Reversing the socket's dst/src point of view gives us the reply
|
|
|
|
* mapping.
|
|
|
|
*/
|
|
|
|
static int
|
|
|
|
getorigdst(struct sock *sk, int optval, void __user *user, int *len)
|
|
|
|
{
|
|
|
|
const struct inet_sock *inet = inet_sk(sk);
|
|
|
|
const struct nf_conntrack_tuple_hash *h;
|
|
|
|
struct nf_conntrack_tuple tuple;
|
|
|
|
|
|
|
|
memset(&tuple, 0, sizeof(tuple));
|
|
|
|
|
|
|
|
lock_sock(sk);
|
|
|
|
tuple.src.u3.ip = inet->inet_rcv_saddr;
|
|
|
|
tuple.src.u.tcp.port = inet->inet_sport;
|
|
|
|
tuple.dst.u3.ip = inet->inet_daddr;
|
|
|
|
tuple.dst.u.tcp.port = inet->inet_dport;
|
|
|
|
tuple.src.l3num = PF_INET;
|
|
|
|
tuple.dst.protonum = sk->sk_protocol;
|
|
|
|
release_sock(sk);
|
|
|
|
|
|
|
|
/* We only do TCP and SCTP at the moment: is there a better way? */
|
|
|
|
if (tuple.dst.protonum != IPPROTO_TCP &&
|
|
|
|
tuple.dst.protonum != IPPROTO_SCTP) {
|
|
|
|
pr_debug("SO_ORIGINAL_DST: Not a TCP/SCTP socket\n");
|
|
|
|
return -ENOPROTOOPT;
|
|
|
|
}
|
|
|
|
|
|
|
|
if ((unsigned int)*len < sizeof(struct sockaddr_in)) {
|
|
|
|
pr_debug("SO_ORIGINAL_DST: len %d not %zu\n",
|
|
|
|
*len, sizeof(struct sockaddr_in));
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
h = nf_conntrack_find_get(sock_net(sk), &nf_ct_zone_dflt, &tuple);
|
|
|
|
if (h) {
|
|
|
|
struct sockaddr_in sin;
|
|
|
|
struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
|
|
|
|
|
|
|
|
sin.sin_family = AF_INET;
|
|
|
|
sin.sin_port = ct->tuplehash[IP_CT_DIR_ORIGINAL]
|
|
|
|
.tuple.dst.u.tcp.port;
|
|
|
|
sin.sin_addr.s_addr = ct->tuplehash[IP_CT_DIR_ORIGINAL]
|
|
|
|
.tuple.dst.u3.ip;
|
|
|
|
memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
|
|
|
|
|
|
|
|
pr_debug("SO_ORIGINAL_DST: %pI4 %u\n",
|
|
|
|
&sin.sin_addr.s_addr, ntohs(sin.sin_port));
|
|
|
|
nf_ct_put(ct);
|
|
|
|
if (copy_to_user(user, &sin, sizeof(sin)) != 0)
|
|
|
|
return -EFAULT;
|
|
|
|
else
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
pr_debug("SO_ORIGINAL_DST: Can't find %pI4/%u-%pI4/%u.\n",
|
|
|
|
&tuple.src.u3.ip, ntohs(tuple.src.u.tcp.port),
|
|
|
|
&tuple.dst.u3.ip, ntohs(tuple.dst.u.tcp.port));
|
|
|
|
return -ENOENT;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct nf_sockopt_ops so_getorigdst = {
|
|
|
|
.pf = PF_INET,
|
|
|
|
.get_optmin = SO_ORIGINAL_DST,
|
|
|
|
.get_optmax = SO_ORIGINAL_DST + 1,
|
|
|
|
.get = getorigdst,
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
};
|
|
|
|
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
|
|
static int
|
|
|
|
ipv6_getorigdst(struct sock *sk, int optval, void __user *user, int *len)
|
|
|
|
{
|
|
|
|
struct nf_conntrack_tuple tuple = { .src.l3num = NFPROTO_IPV6 };
|
|
|
|
const struct ipv6_pinfo *inet6 = inet6_sk(sk);
|
|
|
|
const struct inet_sock *inet = inet_sk(sk);
|
|
|
|
const struct nf_conntrack_tuple_hash *h;
|
|
|
|
struct sockaddr_in6 sin6;
|
|
|
|
struct nf_conn *ct;
|
|
|
|
__be32 flow_label;
|
|
|
|
int bound_dev_if;
|
|
|
|
|
|
|
|
lock_sock(sk);
|
|
|
|
tuple.src.u3.in6 = sk->sk_v6_rcv_saddr;
|
|
|
|
tuple.src.u.tcp.port = inet->inet_sport;
|
|
|
|
tuple.dst.u3.in6 = sk->sk_v6_daddr;
|
|
|
|
tuple.dst.u.tcp.port = inet->inet_dport;
|
|
|
|
tuple.dst.protonum = sk->sk_protocol;
|
|
|
|
bound_dev_if = sk->sk_bound_dev_if;
|
|
|
|
flow_label = inet6->flow_label;
|
|
|
|
release_sock(sk);
|
|
|
|
|
|
|
|
if (tuple.dst.protonum != IPPROTO_TCP &&
|
|
|
|
tuple.dst.protonum != IPPROTO_SCTP)
|
|
|
|
return -ENOPROTOOPT;
|
|
|
|
|
|
|
|
if (*len < 0 || (unsigned int)*len < sizeof(sin6))
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
h = nf_conntrack_find_get(sock_net(sk), &nf_ct_zone_dflt, &tuple);
|
|
|
|
if (!h) {
|
|
|
|
pr_debug("IP6T_SO_ORIGINAL_DST: Can't find %pI6c/%u-%pI6c/%u.\n",
|
|
|
|
&tuple.src.u3.ip6, ntohs(tuple.src.u.tcp.port),
|
|
|
|
&tuple.dst.u3.ip6, ntohs(tuple.dst.u.tcp.port));
|
|
|
|
return -ENOENT;
|
|
|
|
}
|
|
|
|
|
|
|
|
ct = nf_ct_tuplehash_to_ctrack(h);
|
|
|
|
|
|
|
|
sin6.sin6_family = AF_INET6;
|
|
|
|
sin6.sin6_port = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.u.tcp.port;
|
|
|
|
sin6.sin6_flowinfo = flow_label & IPV6_FLOWINFO_MASK;
|
|
|
|
memcpy(&sin6.sin6_addr,
|
|
|
|
&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.u3.in6,
|
|
|
|
sizeof(sin6.sin6_addr));
|
|
|
|
|
|
|
|
nf_ct_put(ct);
|
|
|
|
sin6.sin6_scope_id = ipv6_iface_scope_id(&sin6.sin6_addr, bound_dev_if);
|
|
|
|
return copy_to_user(user, &sin6, sizeof(sin6)) ? -EFAULT : 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct nf_sockopt_ops so_getorigdst6 = {
|
|
|
|
.pf = NFPROTO_IPV6,
|
|
|
|
.get_optmin = IP6T_SO_ORIGINAL_DST,
|
|
|
|
.get_optmax = IP6T_SO_ORIGINAL_DST + 1,
|
|
|
|
.get = ipv6_getorigdst,
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
};
|
|
|
|
|
|
|
|
static unsigned int ipv6_confirm(void *priv,
|
|
|
|
struct sk_buff *skb,
|
|
|
|
const struct nf_hook_state *state)
|
|
|
|
{
|
|
|
|
struct nf_conn *ct;
|
|
|
|
enum ip_conntrack_info ctinfo;
|
|
|
|
unsigned char pnum = ipv6_hdr(skb)->nexthdr;
|
|
|
|
__be16 frag_off;
|
2019-01-09 16:19:34 +00:00
|
|
|
int protoff;
|
2018-06-29 05:46:51 +00:00
|
|
|
|
|
|
|
ct = nf_ct_get(skb, &ctinfo);
|
|
|
|
if (!ct || ctinfo == IP_CT_RELATED_REPLY)
|
2019-01-09 16:19:34 +00:00
|
|
|
return nf_conntrack_confirm(skb);
|
2018-06-29 05:46:51 +00:00
|
|
|
|
2021-10-25 14:13:59 +00:00
|
|
|
if (in_vrf_postrouting(state))
|
|
|
|
return NF_ACCEPT;
|
|
|
|
|
2018-06-29 05:46:51 +00:00
|
|
|
protoff = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &pnum,
|
|
|
|
&frag_off);
|
|
|
|
if (protoff < 0 || (frag_off & htons(~0x7)) != 0) {
|
|
|
|
pr_debug("proto header not found\n");
|
2019-01-09 16:19:34 +00:00
|
|
|
return nf_conntrack_confirm(skb);
|
2018-06-29 05:46:51 +00:00
|
|
|
}
|
|
|
|
|
2019-01-09 16:19:34 +00:00
|
|
|
return nf_confirm(skb, protoff, ct, ctinfo);
|
2018-06-29 05:46:51 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static unsigned int ipv6_conntrack_in(void *priv,
|
|
|
|
struct sk_buff *skb,
|
|
|
|
const struct nf_hook_state *state)
|
|
|
|
{
|
2018-09-12 13:19:07 +00:00
|
|
|
return nf_conntrack_in(skb, state);
|
2018-06-29 05:46:51 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static unsigned int ipv6_conntrack_local(void *priv,
|
|
|
|
struct sk_buff *skb,
|
|
|
|
const struct nf_hook_state *state)
|
|
|
|
{
|
2018-09-12 13:19:07 +00:00
|
|
|
return nf_conntrack_in(skb, state);
|
2018-06-29 05:46:51 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static const struct nf_hook_ops ipv6_conntrack_ops[] = {
|
|
|
|
{
|
|
|
|
.hook = ipv6_conntrack_in,
|
|
|
|
.pf = NFPROTO_IPV6,
|
|
|
|
.hooknum = NF_INET_PRE_ROUTING,
|
|
|
|
.priority = NF_IP6_PRI_CONNTRACK,
|
|
|
|
},
|
|
|
|
{
|
|
|
|
.hook = ipv6_conntrack_local,
|
|
|
|
.pf = NFPROTO_IPV6,
|
|
|
|
.hooknum = NF_INET_LOCAL_OUT,
|
|
|
|
.priority = NF_IP6_PRI_CONNTRACK,
|
|
|
|
},
|
|
|
|
{
|
|
|
|
.hook = ipv6_confirm,
|
|
|
|
.pf = NFPROTO_IPV6,
|
|
|
|
.hooknum = NF_INET_POST_ROUTING,
|
|
|
|
.priority = NF_IP6_PRI_LAST,
|
|
|
|
},
|
|
|
|
{
|
|
|
|
.hook = ipv6_confirm,
|
|
|
|
.pf = NFPROTO_IPV6,
|
|
|
|
.hooknum = NF_INET_LOCAL_IN,
|
|
|
|
.priority = NF_IP6_PRI_LAST - 1,
|
|
|
|
},
|
|
|
|
};
|
|
|
|
#endif
|
|
|
|
|
2018-08-24 21:22:08 +00:00
|
|
|
static int nf_ct_tcp_fixup(struct nf_conn *ct, void *_nfproto)
|
|
|
|
{
|
|
|
|
u8 nfproto = (unsigned long)_nfproto;
|
|
|
|
|
|
|
|
if (nf_ct_l3num(ct) != nfproto)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
if (nf_ct_protonum(ct) == IPPROTO_TCP &&
|
|
|
|
ct->proto.tcp.state == TCP_CONNTRACK_ESTABLISHED) {
|
|
|
|
ct->proto.tcp.seen[0].td_maxwin = 0;
|
|
|
|
ct->proto.tcp.seen[1].td_maxwin = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2019-05-29 11:25:36 +00:00
|
|
|
static struct nf_ct_bridge_info *nf_ct_bridge_info;
|
|
|
|
|
2018-06-29 05:46:51 +00:00
|
|
|
static int nf_ct_netns_do_get(struct net *net, u8 nfproto)
|
|
|
|
{
|
2021-06-02 10:39:07 +00:00
|
|
|
struct nf_conntrack_net *cnet = nf_ct_pernet(net);
|
2019-05-29 11:25:36 +00:00
|
|
|
bool fixup_needed = false, retry = true;
|
2018-06-29 05:46:51 +00:00
|
|
|
int err = 0;
|
2019-05-29 11:25:36 +00:00
|
|
|
retry:
|
2018-06-29 05:46:51 +00:00
|
|
|
mutex_lock(&nf_ct_proto_mutex);
|
|
|
|
|
|
|
|
switch (nfproto) {
|
|
|
|
case NFPROTO_IPV4:
|
|
|
|
cnet->users4++;
|
|
|
|
if (cnet->users4 > 1)
|
|
|
|
goto out_unlock;
|
|
|
|
err = nf_defrag_ipv4_enable(net);
|
|
|
|
if (err) {
|
|
|
|
cnet->users4 = 0;
|
|
|
|
goto out_unlock;
|
|
|
|
}
|
|
|
|
|
|
|
|
err = nf_register_net_hooks(net, ipv4_conntrack_ops,
|
|
|
|
ARRAY_SIZE(ipv4_conntrack_ops));
|
|
|
|
if (err)
|
|
|
|
cnet->users4 = 0;
|
2018-08-24 21:22:08 +00:00
|
|
|
else
|
|
|
|
fixup_needed = true;
|
2018-06-29 05:46:51 +00:00
|
|
|
break;
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
|
|
case NFPROTO_IPV6:
|
|
|
|
cnet->users6++;
|
|
|
|
if (cnet->users6 > 1)
|
|
|
|
goto out_unlock;
|
|
|
|
err = nf_defrag_ipv6_enable(net);
|
|
|
|
if (err < 0) {
|
|
|
|
cnet->users6 = 0;
|
|
|
|
goto out_unlock;
|
|
|
|
}
|
|
|
|
|
|
|
|
err = nf_register_net_hooks(net, ipv6_conntrack_ops,
|
|
|
|
ARRAY_SIZE(ipv6_conntrack_ops));
|
|
|
|
if (err)
|
|
|
|
cnet->users6 = 0;
|
2018-08-24 21:22:08 +00:00
|
|
|
else
|
|
|
|
fixup_needed = true;
|
2018-06-29 05:46:51 +00:00
|
|
|
break;
|
|
|
|
#endif
|
2019-05-29 11:25:36 +00:00
|
|
|
case NFPROTO_BRIDGE:
|
|
|
|
if (!nf_ct_bridge_info) {
|
|
|
|
if (!retry) {
|
|
|
|
err = -EPROTO;
|
|
|
|
goto out_unlock;
|
|
|
|
}
|
|
|
|
mutex_unlock(&nf_ct_proto_mutex);
|
|
|
|
request_module("nf_conntrack_bridge");
|
|
|
|
retry = false;
|
|
|
|
goto retry;
|
|
|
|
}
|
|
|
|
if (!try_module_get(nf_ct_bridge_info->me)) {
|
|
|
|
err = -EPROTO;
|
|
|
|
goto out_unlock;
|
|
|
|
}
|
|
|
|
cnet->users_bridge++;
|
|
|
|
if (cnet->users_bridge > 1)
|
|
|
|
goto out_unlock;
|
|
|
|
|
|
|
|
err = nf_register_net_hooks(net, nf_ct_bridge_info->ops,
|
|
|
|
nf_ct_bridge_info->ops_size);
|
|
|
|
if (err)
|
|
|
|
cnet->users_bridge = 0;
|
|
|
|
else
|
|
|
|
fixup_needed = true;
|
|
|
|
break;
|
2018-06-29 05:46:51 +00:00
|
|
|
default:
|
|
|
|
err = -EPROTO;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
out_unlock:
|
|
|
|
mutex_unlock(&nf_ct_proto_mutex);
|
2018-08-24 21:22:08 +00:00
|
|
|
|
|
|
|
if (fixup_needed)
|
|
|
|
nf_ct_iterate_cleanup_net(net, nf_ct_tcp_fixup,
|
|
|
|
(void *)(unsigned long)nfproto, 0, 0);
|
|
|
|
|
2018-06-29 05:46:51 +00:00
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void nf_ct_netns_do_put(struct net *net, u8 nfproto)
|
|
|
|
{
|
2021-06-02 10:39:07 +00:00
|
|
|
struct nf_conntrack_net *cnet = nf_ct_pernet(net);
|
2018-06-29 05:46:51 +00:00
|
|
|
|
|
|
|
mutex_lock(&nf_ct_proto_mutex);
|
|
|
|
switch (nfproto) {
|
|
|
|
case NFPROTO_IPV4:
|
2021-04-21 07:45:40 +00:00
|
|
|
if (cnet->users4 && (--cnet->users4 == 0)) {
|
2018-06-29 05:46:51 +00:00
|
|
|
nf_unregister_net_hooks(net, ipv4_conntrack_ops,
|
|
|
|
ARRAY_SIZE(ipv4_conntrack_ops));
|
2021-04-21 07:45:40 +00:00
|
|
|
nf_defrag_ipv4_disable(net);
|
|
|
|
}
|
2018-06-29 05:46:51 +00:00
|
|
|
break;
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
|
|
case NFPROTO_IPV6:
|
2021-04-21 07:45:40 +00:00
|
|
|
if (cnet->users6 && (--cnet->users6 == 0)) {
|
2018-06-29 05:46:51 +00:00
|
|
|
nf_unregister_net_hooks(net, ipv6_conntrack_ops,
|
|
|
|
ARRAY_SIZE(ipv6_conntrack_ops));
|
2021-04-21 07:45:40 +00:00
|
|
|
nf_defrag_ipv6_disable(net);
|
|
|
|
}
|
2018-06-29 05:46:51 +00:00
|
|
|
break;
|
|
|
|
#endif
|
2019-05-29 11:25:36 +00:00
|
|
|
case NFPROTO_BRIDGE:
|
|
|
|
if (!nf_ct_bridge_info)
|
|
|
|
break;
|
|
|
|
if (cnet->users_bridge && (--cnet->users_bridge == 0))
|
|
|
|
nf_unregister_net_hooks(net, nf_ct_bridge_info->ops,
|
|
|
|
nf_ct_bridge_info->ops_size);
|
|
|
|
|
|
|
|
module_put(nf_ct_bridge_info->me);
|
|
|
|
break;
|
2018-06-29 05:46:51 +00:00
|
|
|
}
|
|
|
|
mutex_unlock(&nf_ct_proto_mutex);
|
|
|
|
}
|
|
|
|
|
2019-05-29 11:25:39 +00:00
|
|
|
static int nf_ct_netns_inet_get(struct net *net)
|
2018-06-29 05:46:51 +00:00
|
|
|
{
|
|
|
|
int err;
|
|
|
|
|
2019-05-29 11:25:39 +00:00
|
|
|
err = nf_ct_netns_do_get(net, NFPROTO_IPV4);
|
2020-09-01 14:56:02 +00:00
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
2019-05-29 11:25:39 +00:00
|
|
|
if (err < 0)
|
|
|
|
goto err1;
|
|
|
|
err = nf_ct_netns_do_get(net, NFPROTO_IPV6);
|
|
|
|
if (err < 0)
|
|
|
|
goto err2;
|
2018-06-29 05:46:51 +00:00
|
|
|
|
2019-05-29 11:25:39 +00:00
|
|
|
return err;
|
2018-06-29 05:46:51 +00:00
|
|
|
err2:
|
|
|
|
nf_ct_netns_put(net, NFPROTO_IPV4);
|
|
|
|
err1:
|
2020-09-01 14:56:02 +00:00
|
|
|
#endif
|
2018-06-29 05:46:51 +00:00
|
|
|
return err;
|
|
|
|
}
|
2019-05-29 11:25:39 +00:00
|
|
|
|
|
|
|
int nf_ct_netns_get(struct net *net, u8 nfproto)
|
|
|
|
{
|
|
|
|
int err;
|
|
|
|
|
|
|
|
switch (nfproto) {
|
|
|
|
case NFPROTO_INET:
|
|
|
|
err = nf_ct_netns_inet_get(net);
|
|
|
|
break;
|
|
|
|
case NFPROTO_BRIDGE:
|
|
|
|
err = nf_ct_netns_do_get(net, NFPROTO_BRIDGE);
|
|
|
|
if (err < 0)
|
|
|
|
return err;
|
|
|
|
|
|
|
|
err = nf_ct_netns_inet_get(net);
|
|
|
|
if (err < 0) {
|
|
|
|
nf_ct_netns_put(net, NFPROTO_BRIDGE);
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
err = nf_ct_netns_do_get(net, nfproto);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
return err;
|
|
|
|
}
|
2018-06-29 05:46:51 +00:00
|
|
|
EXPORT_SYMBOL_GPL(nf_ct_netns_get);
|
|
|
|
|
|
|
|
void nf_ct_netns_put(struct net *net, uint8_t nfproto)
|
|
|
|
{
|
2019-05-29 11:25:39 +00:00
|
|
|
switch (nfproto) {
|
|
|
|
case NFPROTO_BRIDGE:
|
|
|
|
nf_ct_netns_do_put(net, NFPROTO_BRIDGE);
|
2020-07-08 20:09:39 +00:00
|
|
|
fallthrough;
|
2019-05-29 11:25:39 +00:00
|
|
|
case NFPROTO_INET:
|
2018-06-29 05:46:51 +00:00
|
|
|
nf_ct_netns_do_put(net, NFPROTO_IPV4);
|
|
|
|
nf_ct_netns_do_put(net, NFPROTO_IPV6);
|
2019-05-29 11:25:39 +00:00
|
|
|
break;
|
|
|
|
default:
|
2018-06-29 05:46:51 +00:00
|
|
|
nf_ct_netns_do_put(net, nfproto);
|
2019-05-29 11:25:39 +00:00
|
|
|
break;
|
2018-06-29 05:46:51 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(nf_ct_netns_put);
|
|
|
|
|
2019-05-29 11:25:36 +00:00
|
|
|
void nf_ct_bridge_register(struct nf_ct_bridge_info *info)
|
|
|
|
{
|
|
|
|
WARN_ON(nf_ct_bridge_info);
|
|
|
|
mutex_lock(&nf_ct_proto_mutex);
|
|
|
|
nf_ct_bridge_info = info;
|
|
|
|
mutex_unlock(&nf_ct_proto_mutex);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(nf_ct_bridge_register);
|
|
|
|
|
|
|
|
void nf_ct_bridge_unregister(struct nf_ct_bridge_info *info)
|
|
|
|
{
|
|
|
|
WARN_ON(!nf_ct_bridge_info);
|
|
|
|
mutex_lock(&nf_ct_proto_mutex);
|
|
|
|
nf_ct_bridge_info = NULL;
|
|
|
|
mutex_unlock(&nf_ct_proto_mutex);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(nf_ct_bridge_unregister);
|
|
|
|
|
2018-06-29 05:46:51 +00:00
|
|
|
int nf_conntrack_proto_init(void)
|
|
|
|
{
|
2019-01-15 21:03:47 +00:00
|
|
|
int ret;
|
2018-06-29 05:46:51 +00:00
|
|
|
|
|
|
|
ret = nf_register_sockopt(&so_getorigdst);
|
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
|
|
ret = nf_register_sockopt(&so_getorigdst6);
|
|
|
|
if (ret < 0)
|
|
|
|
goto cleanup_sockopt;
|
|
|
|
#endif
|
2018-09-17 10:02:54 +00:00
|
|
|
|
2018-06-29 05:46:51 +00:00
|
|
|
return ret;
|
2019-01-15 21:03:47 +00:00
|
|
|
|
2018-06-29 05:46:51 +00:00
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
|
|
cleanup_sockopt:
|
2021-05-04 14:40:00 +00:00
|
|
|
nf_unregister_sockopt(&so_getorigdst);
|
2018-06-29 05:46:51 +00:00
|
|
|
#endif
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
void nf_conntrack_proto_fini(void)
|
|
|
|
{
|
|
|
|
nf_unregister_sockopt(&so_getorigdst);
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
|
|
nf_unregister_sockopt(&so_getorigdst6);
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
|
2019-01-15 21:03:47 +00:00
|
|
|
void nf_conntrack_proto_pernet_init(struct net *net)
|
2007-03-14 23:38:25 +00:00
|
|
|
{
|
2019-01-15 21:03:45 +00:00
|
|
|
nf_conntrack_generic_init_net(net);
|
|
|
|
nf_conntrack_udp_init_net(net);
|
|
|
|
nf_conntrack_tcp_init_net(net);
|
|
|
|
nf_conntrack_icmp_init_net(net);
|
2019-01-21 13:46:47 +00:00
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
2019-01-15 21:03:45 +00:00
|
|
|
nf_conntrack_icmpv6_init_net(net);
|
2019-01-21 13:46:47 +00:00
|
|
|
#endif
|
2019-01-15 21:03:45 +00:00
|
|
|
#ifdef CONFIG_NF_CT_PROTO_DCCP
|
|
|
|
nf_conntrack_dccp_init_net(net);
|
|
|
|
#endif
|
|
|
|
#ifdef CONFIG_NF_CT_PROTO_SCTP
|
|
|
|
nf_conntrack_sctp_init_net(net);
|
|
|
|
#endif
|
|
|
|
#ifdef CONFIG_NF_CT_PROTO_GRE
|
|
|
|
nf_conntrack_gre_init_net(net);
|
|
|
|
#endif
|
2007-03-14 23:38:25 +00:00
|
|
|
}
|
|
|
|
|
2018-06-29 05:46:51 +00:00
|
|
|
module_param_call(hashsize, nf_conntrack_set_hashsize, param_get_uint,
|
|
|
|
&nf_conntrack_htable_size, 0600);
|
|
|
|
|
|
|
|
MODULE_ALIAS("ip_conntrack");
|
|
|
|
MODULE_ALIAS("nf_conntrack-" __stringify(AF_INET));
|
|
|
|
MODULE_ALIAS("nf_conntrack-" __stringify(AF_INET6));
|
|
|
|
MODULE_LICENSE("GPL");
|