summaryrefslogtreecommitdiffstats
path: root/target/linux/lantiq/patches-3.3/0055-MIPS-lantiq-udp-in-kernel-redirect.patch
blob: 98b43ab8add5f35c1f57db2060728f98d36f826a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
From 186a2683b8fc1730dff28b2201d7508501a1dee4 Mon Sep 17 00:00:00 2001
From: John Crispin <blogic@openwrt.org>
Date: Thu, 29 Sep 2011 20:29:54 +0200
Subject: [PATCH 55/70] MIPS: lantiq: udp in-kernel redirect

---
 include/linux/udp_redirect.h |   57 +++++++++++++
 net/Kconfig                  |    6 ++
 net/ipv4/Makefile            |    3 +
 net/ipv4/udp.c               |   28 ++++++-
 net/ipv4/udp_redirect_symb.c |  186 ++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 276 insertions(+), 4 deletions(-)
 create mode 100644 include/linux/udp_redirect.h
 create mode 100644 net/ipv4/udp_redirect_symb.c

--- /dev/null
+++ b/include/linux/udp_redirect.h
@@ -0,0 +1,57 @@
+#ifndef _UDP_REDIRECT_H
+#define _UDP_REDIRECT_H
+
+/******************************************************************************
+
+                               Copyright (c) 2006
+                            Infineon Technologies AG
+                     Am Campeon 1-12; 81726 Munich, Germany
+
+  THE DELIVERY OF THIS SOFTWARE AS WELL AS THE HEREBY GRANTED NON-EXCLUSIVE,
+  WORLDWIDE LICENSE TO USE, COPY, MODIFY, DISTRIBUTE AND SUBLICENSE THIS
+  SOFTWARE IS FREE OF CHARGE.
+
+  THE LICENSED SOFTWARE IS PROVIDED "AS IS" AND INFINEON EXPRESSLY DISCLAIMS
+  ALL REPRESENTATIONS AND WARRANTIES, WHETHER EXPRESS OR IMPLIED, INCLUDING
+  WITHOUT LIMITATION, WARRANTIES OR REPRESENTATIONS OF WORKMANSHIP,
+  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, DURABILITY, THAT THE
+  OPERATING OF THE LICENSED SOFTWARE WILL BE ERROR FREE OR FREE OF ANY THIRD
+  PARTY CLAIMS, INCLUDING WITHOUT LIMITATION CLAIMS OF THIRD PARTY INTELLECTUAL
+  PROPERTY INFRINGEMENT.
+
+  EXCEPT FOR ANY LIABILITY DUE TO WILFUL ACTS OR GROSS NEGLIGENCE AND EXCEPT
+  FOR ANY PERSONAL INJURY INFINEON SHALL IN NO EVENT BE LIABLE FOR ANY CLAIM
+  OR DAMAGES OF ANY KIND, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+  ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+  DEALINGS IN THE SOFTWARE.
+
+******************************************************************************/
+
+/* ============================= */
+/* Includes                      */
+/* ============================= */
+#ifndef _LINUX_TYPES_H
+#include <linux/types.h>
+#endif
+
+
+/* ============================= */
+/* Definitions                   */
+/* ============================= */
+#define UDP_REDIRECT_MAGIC (void*)0x55445052L
+
+
+/* ============================= */
+/* Global variable declaration   */
+/* ============================= */
+extern int (*udp_do_redirect_fn)(struct sock *sk, struct sk_buff *skb);
+extern int (*udpredirect_getfrag_fn)(void *p, char * to,
+                                     int offset, int fraglen, int odd,
+                                     struct sk_buff *skb);
+/* ============================= */
+/* Global function declaration   */
+/* ============================= */
+
+extern int udpredirect_getfrag(void *p, char * to, int offset,
+                               int fraglen, int odd, struct sk_buff *skb);
+#endif
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -78,6 +78,12 @@ config INET
 
 	  Short answer: say Y.
 
+config IFX_UDP_REDIRECT
+	bool "IFX Kernel Packet Interface for UDP redirection"
+	help
+	  You can say Y here if you want to use hooks from kernel for
+	  UDP redirection.
+
 if INET
 source "net/ipv4/Kconfig"
 source "net/ipv6/Kconfig"
--- a/net/ipv4/Makefile
+++ b/net/ipv4/Makefile
@@ -14,6 +14,9 @@ obj-y     := route.o inetpeer.o protocol
 	     inet_fragment.o ping.o
 
 obj-$(CONFIG_SYSCTL) += sysctl_net_ipv4.o
+ifneq ($(CONFIG_IFX_UDP_REDIRECT),)
+obj-$(CONFIG_IFX_UDP_REDIRECT) += udp_redirect_symb.o
+endif
 obj-$(CONFIG_PROC_FS) += proc.o
 obj-$(CONFIG_IP_MULTIPLE_TABLES) += fib_rules.o
 obj-$(CONFIG_IP_MROUTE) += ipmr.o
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -108,6 +108,10 @@
 #include <trace/events/udp.h>
 #include "udp_impl.h"
 
+#if defined(CONFIG_IFX_UDP_REDIRECT) || defined(CONFIG_IFX_UDP_REDIRECT_MODULE)
+#include <linux/udp_redirect.h>
+#endif
+
 struct udp_table udp_table __read_mostly;
 EXPORT_SYMBOL(udp_table);
 
@@ -804,7 +808,7 @@ int udp_sendmsg(struct kiocb *iocb, stru
 	u8  tos;
 	int err, is_udplite = IS_UDPLITE(sk);
 	int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
-	int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
+	int (*getfrag)(void *, char *, int, int, int, struct sk_buff *) = NULL;
 	struct sk_buff *skb;
 	struct ip_options_data opt_copy;
 
@@ -821,7 +825,13 @@ int udp_sendmsg(struct kiocb *iocb, stru
 	ipc.opt = NULL;
 	ipc.tx_flags = 0;
 
-	getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
+/* UDPREDIRECT */
+#if defined(CONFIG_IFX_UDP_REDIRECT) || defined(CONFIG_IFX_UDP_REDIRECT_MODULE)
+	if(udpredirect_getfrag_fn && sk->sk_user_data == UDP_REDIRECT_MAGIC)
+		getfrag = udpredirect_getfrag_fn;
+	else
+#endif /* IFX_UDP_REDIRECT */
+		getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
 
 	fl4 = &inet->cork.fl.u.ip4;
 	if (up->pending) {
@@ -1625,6 +1635,7 @@ int __udp4_lib_rcv(struct sk_buff *skb,
 	struct rtable *rt = skb_rtable(skb);
 	__be32 saddr, daddr;
 	struct net *net = dev_net(skb->dev);
+	int ret = 0;
 
 	/*
 	 *  Validate the packet.
@@ -1657,7 +1668,16 @@ int __udp4_lib_rcv(struct sk_buff *skb,
 	sk = __udp4_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
 
 	if (sk != NULL) {
-		int ret = udp_queue_rcv_skb(sk, skb);
+	/* UDPREDIRECT */
+#if defined(CONFIG_IFX_UDP_REDIRECT) || defined(CONFIG_IFX_UDP_REDIRECT_MODULE)
+      if(udp_do_redirect_fn && sk->sk_user_data == UDP_REDIRECT_MAGIC)
+      {
+         udp_do_redirect_fn(sk,skb);
+         kfree_skb(skb);
+         return(0);
+      }
+#endif
+		ret = udp_queue_rcv_skb(sk, skb);
 		sock_put(sk);
 
 		/* a return value > 0 means to resubmit the input, but
@@ -1954,7 +1974,7 @@ struct proto udp_prot = {
 	.clear_sk	   = sk_prot_clear_portaddr_nulls,
 };
 EXPORT_SYMBOL(udp_prot);
-
+EXPORT_SYMBOL(udp_rcv);
 /* ------------------------------------------------------------------------ */
 #ifdef CONFIG_PROC_FS
 
--- /dev/null
+++ b/net/ipv4/udp_redirect_symb.c
@@ -0,0 +1,186 @@
+/******************************************************************************
+
+                               Copyright (c) 2006
+                            Infineon Technologies AG
+                     Am Campeon 1-12; 81726 Munich, Germany
+
+  THE DELIVERY OF THIS SOFTWARE AS WELL AS THE HEREBY GRANTED NON-EXCLUSIVE,
+  WORLDWIDE LICENSE TO USE, COPY, MODIFY, DISTRIBUTE AND SUBLICENSE THIS
+  SOFTWARE IS FREE OF CHARGE.
+
+  THE LICENSED SOFTWARE IS PROVIDED "AS IS" AND INFINEON EXPRESSLY DISCLAIMS
+  ALL REPRESENTATIONS AND WARRANTIES, WHETHER EXPRESS OR IMPLIED, INCLUDING
+  WITHOUT LIMITATION, WARRANTIES OR REPRESENTATIONS OF WORKMANSHIP,
+  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, DURABILITY, THAT THE
+  OPERATING OF THE LICENSED SOFTWARE WILL BE ERROR FREE OR FREE OF ANY THIRD
+  PARTY CLAIMS, INCLUDING WITHOUT LIMITATION CLAIMS OF THIRD PARTY INTELLECTUAL
+  PROPERTY INFRINGEMENT.
+
+  EXCEPT FOR ANY LIABILITY DUE TO WILFUL ACTS OR GROSS NEGLIGENCE AND EXCEPT
+  FOR ANY PERSONAL INJURY INFINEON SHALL IN NO EVENT BE LIABLE FOR ANY CLAIM
+  OR DAMAGES OF ANY KIND, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+  ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+  DEALINGS IN THE SOFTWARE.
+
+******************************************************************************/
+#if defined(CONFIG_IFX_UDP_REDIRECT) || defined(CONFIG_IFX_UDP_REDIRECT_MODULE)
+/* ============================= */
+/* Includes                      */
+/* ============================= */
+#include <net/checksum.h>
+#include <net/udp.h>
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/udp_redirect.h>
+
+/* ============================= */
+/* Global variable definition    */
+/* ============================= */
+int (*udpredirect_getfrag_fn) (void *p, char * to, int offset,
+                               int fraglen, int odd, struct sk_buff *skb) = NULL;
+int (*udp_do_redirect_fn)(struct sock *sk, struct sk_buff *skb) = NULL;
+
+/* ============================= */
+/* Local type definitions        */
+/* ============================= */
+struct udpfakehdr
+{
+  struct udphdr uh;
+  u32 saddr;
+  u32 daddr;
+  struct iovec *iov;
+  u32 wcheck;
+};
+
+/* ============================= */
+/* Local function declaration    */
+/* ============================= */
+static int udpredirect_csum_partial_copy_fromiovecend(unsigned char *kdata,
+              struct iovec *iov, int offset, unsigned int len, __wsum *csump);
+
+static int udpredirect_memcpy_fromiovecend(unsigned char *kdata, struct iovec *iov, int offset,
+                        int len);
+
+/* ============================= */
+/* Global function definition    */
+/* ============================= */
+
+/*
+   Copy of udp_getfrag() from udp.c
+   This function exists because no copy_from_user() is needed for udpredirect.
+*/
+
+int
+udpredirect_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb)
+{
+   struct iovec *iov = from;
+
+        if (skb->ip_summed == CHECKSUM_PARTIAL) {
+                if (udpredirect_memcpy_fromiovecend(to, iov, offset, len) < 0)
+                        return -EFAULT;
+        } else {
+                __wsum csum = 0;
+                if (udpredirect_csum_partial_copy_fromiovecend(to, iov, offset, len, &csum) < 0)
+                        return -EFAULT;
+                skb->csum = csum_block_add(skb->csum, csum, odd);
+        }
+        return 0;
+}
+
+static int udpredirect_memcpy_fromiovecend(unsigned char *kdata, struct iovec *iov, int offset,
+                        int len)
+{
+        /* Skip over the finished iovecs */
+        while (offset >= iov->iov_len) {
+                offset -= iov->iov_len;
+                iov++;
+        }
+
+        while (len > 0) {
+                u8 __user *base = iov->iov_base + offset;
+                int copy = min_t(unsigned int, len, iov->iov_len - offset);
+
+                offset = 0;
+                memcpy(kdata, base, copy);
+                len -= copy;
+                kdata += copy;
+                iov++;
+        }
+
+        return 0;
+}
+
+/*
+   Copy of csum_partial_copy_fromiovecend() from iovec.c
+   This function exists because no copy_from_user() is needed for udpredirect.
+*/
+
+int udpredirect_csum_partial_copy_fromiovecend(unsigned char *kdata, struct iovec *iov,
+				 int offset, unsigned int len, __wsum *csump)
+{
+	__wsum csum = *csump;
+	int partial_cnt = 0, err = 0;
+
+	/* Skip over the finished iovecs */
+	while (offset >= iov->iov_len) {
+		offset -= iov->iov_len;
+		iov++;
+	}
+
+	while (len > 0) {
+		u8 __user *base = iov->iov_base + offset;
+		int copy = min_t(unsigned int, len, iov->iov_len - offset);
+
+		offset = 0;
+
+		/* There is a remnant from previous iov. */
+		if (partial_cnt) {
+			int par_len = 4 - partial_cnt;
+
+			/* iov component is too short ... */
+			if (par_len > copy) {
+				memcpy(kdata, base, copy);
+				kdata += copy;
+				base  += copy;
+				partial_cnt += copy;
+				len   -= copy;
+				iov++;
+				if (len)
+					continue;
+				*csump = csum_partial(kdata - partial_cnt,
+							 partial_cnt, csum);
+				goto out;
+			}
+			memcpy(kdata, base, par_len);
+			csum = csum_partial(kdata - partial_cnt, 4, csum);
+			kdata += par_len;
+			base  += par_len;
+			copy  -= par_len;
+			len   -= par_len;
+			partial_cnt = 0;
+		}
+
+		if (len > copy) {
+			partial_cnt = copy % 4;
+			if (partial_cnt) {
+				copy -= partial_cnt;
+				memcpy(kdata + copy, base + copy, partial_cnt);
+			}
+		}
+
+		if (copy) {
+			csum = csum_partial_copy_nocheck(base, kdata, copy, csum);
+		}
+		len   -= copy + partial_cnt;
+		kdata += copy + partial_cnt;
+		iov++;
+	}
+        *csump = csum;
+out:
+	return err;
+}
+
+EXPORT_SYMBOL(udpredirect_getfrag);
+EXPORT_SYMBOL(udp_do_redirect_fn);
+EXPORT_SYMBOL(udpredirect_getfrag_fn);
+#endif /* CONFIG_IFX_UDP_REDIRECT* */