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-rw-r--r--include/linux/in6.h4
-rw-r--r--include/linux/ipv6.h4
-rw-r--r--include/linux/netfilter/xt_TPROXY.h13
-rw-r--r--include/net/inet_hashtables.h2
-rw-r--r--include/net/netfilter/ipv6/nf_defrag_ipv6.h6
-rw-r--r--include/net/netfilter/nf_tproxy_core.h192
-rw-r--r--include/net/udp.h3
7 files changed, 216 insertions, 8 deletions
diff --git a/include/linux/in6.h b/include/linux/in6.h
index c4bf46f764bf..097a34b55560 100644
--- a/include/linux/in6.h
+++ b/include/linux/in6.h
@@ -268,6 +268,10 @@ struct in6_flowlabel_req {
268/* RFC5082: Generalized Ttl Security Mechanism */ 268/* RFC5082: Generalized Ttl Security Mechanism */
269#define IPV6_MINHOPCOUNT 73 269#define IPV6_MINHOPCOUNT 73
270 270
271#define IPV6_ORIGDSTADDR 74
272#define IPV6_RECVORIGDSTADDR IPV6_ORIGDSTADDR
273#define IPV6_TRANSPARENT 75
274
271/* 275/*
272 * Multicast Routing: 276 * Multicast Routing:
273 * see include/linux/mroute6.h. 277 * see include/linux/mroute6.h.
diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h
index e62683ba88e6..8e429d0e0405 100644
--- a/include/linux/ipv6.h
+++ b/include/linux/ipv6.h
@@ -341,7 +341,9 @@ struct ipv6_pinfo {
341 odstopts:1, 341 odstopts:1,
342 rxflow:1, 342 rxflow:1,
343 rxtclass:1, 343 rxtclass:1,
344 rxpmtu:1; 344 rxpmtu:1,
345 rxorigdstaddr:1;
346 /* 2 bits hole */
345 } bits; 347 } bits;
346 __u16 all; 348 __u16 all;
347 } rxopt; 349 } rxopt;
diff --git a/include/linux/netfilter/xt_TPROXY.h b/include/linux/netfilter/xt_TPROXY.h
index 152e8f97132b..3f3d69361289 100644
--- a/include/linux/netfilter/xt_TPROXY.h
+++ b/include/linux/netfilter/xt_TPROXY.h
@@ -1,5 +1,5 @@
1#ifndef _XT_TPROXY_H_target 1#ifndef _XT_TPROXY_H
2#define _XT_TPROXY_H_target 2#define _XT_TPROXY_H
3 3
4/* TPROXY target is capable of marking the packet to perform 4/* TPROXY target is capable of marking the packet to perform
5 * redirection. We can get rid of that whenever we get support for 5 * redirection. We can get rid of that whenever we get support for
@@ -11,4 +11,11 @@ struct xt_tproxy_target_info {
11 __be16 lport; 11 __be16 lport;
12}; 12};
13 13
14#endif /* _XT_TPROXY_H_target */ 14struct xt_tproxy_target_info_v1 {
15 u_int32_t mark_mask;
16 u_int32_t mark_value;
17 union nf_inet_addr laddr;
18 __be16 lport;
19};
20
21#endif /* _XT_TPROXY_H */
diff --git a/include/net/inet_hashtables.h b/include/net/inet_hashtables.h
index 74358d1b3f43..e9c2ed8af864 100644
--- a/include/net/inet_hashtables.h
+++ b/include/net/inet_hashtables.h
@@ -245,7 +245,7 @@ static inline int inet_sk_listen_hashfn(const struct sock *sk)
245} 245}
246 246
247/* Caller must disable local BH processing. */ 247/* Caller must disable local BH processing. */
248extern void __inet_inherit_port(struct sock *sk, struct sock *child); 248extern int __inet_inherit_port(struct sock *sk, struct sock *child);
249 249
250extern void inet_put_port(struct sock *sk); 250extern void inet_put_port(struct sock *sk);
251 251
diff --git a/include/net/netfilter/ipv6/nf_defrag_ipv6.h b/include/net/netfilter/ipv6/nf_defrag_ipv6.h
new file mode 100644
index 000000000000..94dd54d76b48
--- /dev/null
+++ b/include/net/netfilter/ipv6/nf_defrag_ipv6.h
@@ -0,0 +1,6 @@
1#ifndef _NF_DEFRAG_IPV6_H
2#define _NF_DEFRAG_IPV6_H
3
4extern void nf_defrag_ipv6_enable(void);
5
6#endif /* _NF_DEFRAG_IPV6_H */
diff --git a/include/net/netfilter/nf_tproxy_core.h b/include/net/netfilter/nf_tproxy_core.h
index 208b46f4d6d2..cd85b3bc8327 100644
--- a/include/net/netfilter/nf_tproxy_core.h
+++ b/include/net/netfilter/nf_tproxy_core.h
@@ -5,15 +5,201 @@
5#include <linux/in.h> 5#include <linux/in.h>
6#include <linux/skbuff.h> 6#include <linux/skbuff.h>
7#include <net/sock.h> 7#include <net/sock.h>
8#include <net/inet_sock.h> 8#include <net/inet_hashtables.h>
9#include <net/inet6_hashtables.h>
9#include <net/tcp.h> 10#include <net/tcp.h>
10 11
12#define NFT_LOOKUP_ANY 0
13#define NFT_LOOKUP_LISTENER 1
14#define NFT_LOOKUP_ESTABLISHED 2
15
11/* look up and get a reference to a matching socket */ 16/* look up and get a reference to a matching socket */
12extern struct sock * 17
18
19/* This function is used by the 'TPROXY' target and the 'socket'
20 * match. The following lookups are supported:
21 *
22 * Explicit TProxy target rule
23 * ===========================
24 *
25 * This is used when the user wants to intercept a connection matching
26 * an explicit iptables rule. In this case the sockets are assumed
27 * matching in preference order:
28 *
29 * - match: if there's a fully established connection matching the
30 * _packet_ tuple, it is returned, assuming the redirection
31 * already took place and we process a packet belonging to an
32 * established connection
33 *
34 * - match: if there's a listening socket matching the redirection
35 * (e.g. on-port & on-ip of the connection), it is returned,
36 * regardless if it was bound to 0.0.0.0 or an explicit
37 * address. The reasoning is that if there's an explicit rule, it
38 * does not really matter if the listener is bound to an interface
39 * or to 0. The user already stated that he wants redirection
40 * (since he added the rule).
41 *
42 * "socket" match based redirection (no specific rule)
43 * ===================================================
44 *
45 * There are connections with dynamic endpoints (e.g. FTP data
46 * connection) that the user is unable to add explicit rules
47 * for. These are taken care of by a generic "socket" rule. It is
48 * assumed that the proxy application is trusted to open such
49 * connections without explicit iptables rule (except of course the
50 * generic 'socket' rule). In this case the following sockets are
51 * matched in preference order:
52 *
53 * - match: if there's a fully established connection matching the
54 * _packet_ tuple
55 *
56 * - match: if there's a non-zero bound listener (possibly with a
57 * non-local address) We don't accept zero-bound listeners, since
58 * then local services could intercept traffic going through the
59 * box.
60 *
61 * Please note that there's an overlap between what a TPROXY target
62 * and a socket match will match. Normally if you have both rules the
63 * "socket" match will be the first one, effectively all packets
64 * belonging to established connections going through that one.
65 */
66static inline struct sock *
13nf_tproxy_get_sock_v4(struct net *net, const u8 protocol, 67nf_tproxy_get_sock_v4(struct net *net, const u8 protocol,
14 const __be32 saddr, const __be32 daddr, 68 const __be32 saddr, const __be32 daddr,
15 const __be16 sport, const __be16 dport, 69 const __be16 sport, const __be16 dport,
16 const struct net_device *in, bool listening); 70 const struct net_device *in, int lookup_type)
71{
72 struct sock *sk;
73
74 /* look up socket */
75 switch (protocol) {
76 case IPPROTO_TCP:
77 switch (lookup_type) {
78 case NFT_LOOKUP_ANY:
79 sk = __inet_lookup(net, &tcp_hashinfo,
80 saddr, sport, daddr, dport,
81 in->ifindex);
82 break;
83 case NFT_LOOKUP_LISTENER:
84 sk = inet_lookup_listener(net, &tcp_hashinfo,
85 daddr, dport,
86 in->ifindex);
87
88 /* NOTE: we return listeners even if bound to
89 * 0.0.0.0, those are filtered out in
90 * xt_socket, since xt_TPROXY needs 0 bound
91 * listeners too */
92
93 break;
94 case NFT_LOOKUP_ESTABLISHED:
95 sk = inet_lookup_established(net, &tcp_hashinfo,
96 saddr, sport, daddr, dport,
97 in->ifindex);
98 break;
99 default:
100 WARN_ON(1);
101 sk = NULL;
102 break;
103 }
104 break;
105 case IPPROTO_UDP:
106 sk = udp4_lib_lookup(net, saddr, sport, daddr, dport,
107 in->ifindex);
108 if (sk && lookup_type != NFT_LOOKUP_ANY) {
109 int connected = (sk->sk_state == TCP_ESTABLISHED);
110 int wildcard = (inet_sk(sk)->inet_rcv_saddr == 0);
111
112 /* NOTE: we return listeners even if bound to
113 * 0.0.0.0, those are filtered out in
114 * xt_socket, since xt_TPROXY needs 0 bound
115 * listeners too */
116 if ((lookup_type == NFT_LOOKUP_ESTABLISHED && (!connected || wildcard)) ||
117 (lookup_type == NFT_LOOKUP_LISTENER && connected)) {
118 sock_put(sk);
119 sk = NULL;
120 }
121 }
122 break;
123 default:
124 WARN_ON(1);
125 sk = NULL;
126 }
127
128 pr_debug("tproxy socket lookup: proto %u %08x:%u -> %08x:%u, lookup type: %d, sock %p\n",
129 protocol, ntohl(saddr), ntohs(sport), ntohl(daddr), ntohs(dport), lookup_type, sk);
130
131 return sk;
132}
133
134#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
135static inline struct sock *
136nf_tproxy_get_sock_v6(struct net *net, const u8 protocol,
137 const struct in6_addr *saddr, const struct in6_addr *daddr,
138 const __be16 sport, const __be16 dport,
139 const struct net_device *in, int lookup_type)
140{
141 struct sock *sk;
142
143 /* look up socket */
144 switch (protocol) {
145 case IPPROTO_TCP:
146 switch (lookup_type) {
147 case NFT_LOOKUP_ANY:
148 sk = inet6_lookup(net, &tcp_hashinfo,
149 saddr, sport, daddr, dport,
150 in->ifindex);
151 break;
152 case NFT_LOOKUP_LISTENER:
153 sk = inet6_lookup_listener(net, &tcp_hashinfo,
154 daddr, ntohs(dport),
155 in->ifindex);
156
157 /* NOTE: we return listeners even if bound to
158 * 0.0.0.0, those are filtered out in
159 * xt_socket, since xt_TPROXY needs 0 bound
160 * listeners too */
161
162 break;
163 case NFT_LOOKUP_ESTABLISHED:
164 sk = __inet6_lookup_established(net, &tcp_hashinfo,
165 saddr, sport, daddr, ntohs(dport),
166 in->ifindex);
167 break;
168 default:
169 WARN_ON(1);
170 sk = NULL;
171 break;
172 }
173 break;
174 case IPPROTO_UDP:
175 sk = udp6_lib_lookup(net, saddr, sport, daddr, dport,
176 in->ifindex);
177 if (sk && lookup_type != NFT_LOOKUP_ANY) {
178 int connected = (sk->sk_state == TCP_ESTABLISHED);
179 int wildcard = ipv6_addr_any(&inet6_sk(sk)->rcv_saddr);
180
181 /* NOTE: we return listeners even if bound to
182 * 0.0.0.0, those are filtered out in
183 * xt_socket, since xt_TPROXY needs 0 bound
184 * listeners too */
185 if ((lookup_type == NFT_LOOKUP_ESTABLISHED && (!connected || wildcard)) ||
186 (lookup_type == NFT_LOOKUP_LISTENER && connected)) {
187 sock_put(sk);
188 sk = NULL;
189 }
190 }
191 break;
192 default:
193 WARN_ON(1);
194 sk = NULL;
195 }
196
197 pr_debug("tproxy socket lookup: proto %u %pI6:%u -> %pI6:%u, lookup type: %d, sock %p\n",
198 protocol, saddr, ntohs(sport), daddr, ntohs(dport), lookup_type, sk);
199
200 return sk;
201}
202#endif
17 203
18static inline void 204static inline void
19nf_tproxy_put_sock(struct sock *sk) 205nf_tproxy_put_sock(struct sock *sk)
diff --git a/include/net/udp.h b/include/net/udp.h
index a184d3496b13..200b82848c9a 100644
--- a/include/net/udp.h
+++ b/include/net/udp.h
@@ -183,6 +183,9 @@ extern int udp_lib_setsockopt(struct sock *sk, int level, int optname,
183extern struct sock *udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport, 183extern struct sock *udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport,
184 __be32 daddr, __be16 dport, 184 __be32 daddr, __be16 dport,
185 int dif); 185 int dif);
186extern struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
187 const struct in6_addr *daddr, __be16 dport,
188 int dif);
186 189
187/* 190/*
188 * SNMP statistics for UDP and UDP-Lite 191 * SNMP statistics for UDP and UDP-Lite
generated by cgit v1.2.2 (git 2.25.0) at 2025-12-29 23:17:49 -0500