target/linux/lantiq/patches/300-udp_redirect.patch

   1 --- /dev/null
   2 +++ b/include/linux/udp_redirect.h
   3 @@ -0,0 +1,57 @@
   4 +#ifndef _UDP_REDIRECT_H
   5 +#define _UDP_REDIRECT_H
   6 +
   7 +/******************************************************************************
   8 +
   9 +                               Copyright (c) 2006
  10 +                            Infineon Technologies AG
  11 +                     Am Campeon 1-12; 81726 Munich, Germany
  12 +
  13 +  THE DELIVERY OF THIS SOFTWARE AS WELL AS THE HEREBY GRANTED NON-EXCLUSIVE,
  14 +  WORLDWIDE LICENSE TO USE, COPY, MODIFY, DISTRIBUTE AND SUBLICENSE THIS
  15 +  SOFTWARE IS FREE OF CHARGE.
  16 +
  17 +  THE LICENSED SOFTWARE IS PROVIDED "AS IS" AND INFINEON EXPRESSLY DISCLAIMS
  18 +  ALL REPRESENTATIONS AND WARRANTIES, WHETHER EXPRESS OR IMPLIED, INCLUDING
  19 +  WITHOUT LIMITATION, WARRANTIES OR REPRESENTATIONS OF WORKMANSHIP,
  20 +  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, DURABILITY, THAT THE
  21 +  OPERATING OF THE LICENSED SOFTWARE WILL BE ERROR FREE OR FREE OF ANY THIRD
  22 +  PARTY CLAIMS, INCLUDING WITHOUT LIMITATION CLAIMS OF THIRD PARTY INTELLECTUAL
  23 +  PROPERTY INFRINGEMENT.
  24 +
  25 +  EXCEPT FOR ANY LIABILITY DUE TO WILFUL ACTS OR GROSS NEGLIGENCE AND EXCEPT
  26 +  FOR ANY PERSONAL INJURY INFINEON SHALL IN NO EVENT BE LIABLE FOR ANY CLAIM
  27 +  OR DAMAGES OF ANY KIND, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  28 +  ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  29 +  DEALINGS IN THE SOFTWARE.
  30 +
  31 +******************************************************************************/
  32 +
  33 +/* ============================= */
  34 +/* Includes                      */
  35 +/* ============================= */
  36 +#ifndef _LINUX_TYPES_H
  37 +#include <linux/types.h>
  38 +#endif
  39 +
  40 +
  41 +/* ============================= */
  42 +/* Definitions                   */
  43 +/* ============================= */
  44 +#define UDP_REDIRECT_MAGIC (void*)0x55445052L
  45 +
  46 +
  47 +/* ============================= */
  48 +/* Global variable declaration   */
  49 +/* ============================= */
  50 +extern int (*udp_do_redirect_fn)(struct sock *sk, struct sk_buff *skb);
  51 +extern int (*udpredirect_getfrag_fn)(void *p, char * to,
  52 +                                     int offset, int fraglen, int odd,
  53 +                                     struct sk_buff *skb);
  54 +/* ============================= */
  55 +/* Global function declaration   */
  56 +/* ============================= */
  57 +
  58 +extern int udpredirect_getfrag(void *p, char * to, int offset,
  59 +                               int fraglen, int odd, struct sk_buff *skb);
  60 +#endif
  61 --- /dev/null
  62 +++ b/net/ipv4/udp_redirect_symb.c
  63 @@ -0,0 +1,186 @@
  64 +/******************************************************************************
  65 +
  66 +                               Copyright (c) 2006
  67 +                            Infineon Technologies AG
  68 +                     Am Campeon 1-12; 81726 Munich, Germany
  69 +
  70 +  THE DELIVERY OF THIS SOFTWARE AS WELL AS THE HEREBY GRANTED NON-EXCLUSIVE,
  71 +  WORLDWIDE LICENSE TO USE, COPY, MODIFY, DISTRIBUTE AND SUBLICENSE THIS
  72 +  SOFTWARE IS FREE OF CHARGE.
  73 +
  74 +  THE LICENSED SOFTWARE IS PROVIDED "AS IS" AND INFINEON EXPRESSLY DISCLAIMS
  75 +  ALL REPRESENTATIONS AND WARRANTIES, WHETHER EXPRESS OR IMPLIED, INCLUDING
  76 +  WITHOUT LIMITATION, WARRANTIES OR REPRESENTATIONS OF WORKMANSHIP,
  77 +  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, DURABILITY, THAT THE
  78 +  OPERATING OF THE LICENSED SOFTWARE WILL BE ERROR FREE OR FREE OF ANY THIRD
  79 +  PARTY CLAIMS, INCLUDING WITHOUT LIMITATION CLAIMS OF THIRD PARTY INTELLECTUAL
  80 +  PROPERTY INFRINGEMENT.
  81 +
  82 +  EXCEPT FOR ANY LIABILITY DUE TO WILFUL ACTS OR GROSS NEGLIGENCE AND EXCEPT
  83 +  FOR ANY PERSONAL INJURY INFINEON SHALL IN NO EVENT BE LIABLE FOR ANY CLAIM
  84 +  OR DAMAGES OF ANY KIND, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  85 +  ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  86 +  DEALINGS IN THE SOFTWARE.
  87 +
  88 +******************************************************************************/
  89 +#if defined(CONFIG_IFX_UDP_REDIRECT) || defined(CONFIG_IFX_UDP_REDIRECT_MODULE)
  90 +/* ============================= */
  91 +/* Includes                      */
  92 +/* ============================= */
  93 +#include <net/checksum.h>
  94 +#include <net/udp.h>
  95 +#include <linux/module.h>
  96 +#include <linux/skbuff.h>
  97 +#include <linux/udp_redirect.h>
  98 +
  99 +/* ============================= */
 100 +/* Global variable definition    */
 101 +/* ============================= */
 102 +int (*udpredirect_getfrag_fn) (void *p, char * to, int offset,
 103 +                               int fraglen, int odd, struct sk_buff *skb) = NULL;
 104 +int (*udp_do_redirect_fn)(struct sock *sk, struct sk_buff *skb) = NULL;
 105 +
 106 +/* ============================= */
 107 +/* Local type definitions        */
 108 +/* ============================= */
 109 +struct udpfakehdr
 110 +{
 111 +  struct udphdr uh;
 112 +  u32 saddr;
 113 +  u32 daddr;
 114 +  struct iovec *iov;
 115 +  u32 wcheck;
 116 +};
 117 +
 118 +/* ============================= */
 119 +/* Local function declaration    */
 120 +/* ============================= */
 121 +static int udpredirect_csum_partial_copy_fromiovecend(unsigned char *kdata,
 122 +              struct iovec *iov, int offset, unsigned int len, __wsum *csump);
 123 +
 124 +static int udpredirect_memcpy_fromiovecend(unsigned char *kdata, struct iovec *iov, int offset,
 125 +                        int len);
 126 +
 127 +/* ============================= */
 128 +/* Global function definition    */
 129 +/* ============================= */
 130 +
 131 +/*
 132 +   Copy of udp_getfrag() from udp.c
 133 +   This function exists because no copy_from_user() is needed for udpredirect.
 134 +*/
 135 +
 136 +int
 137 +udpredirect_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb)
 138 +{
 139 +   struct iovec *iov = from;
 140 +
 141 +        if (skb->ip_summed == CHECKSUM_PARTIAL) {
 142 +                if (udpredirect_memcpy_fromiovecend(to, iov, offset, len) < 0)
 143 +                        return -EFAULT;
 144 +        } else {
 145 +                __wsum csum = 0;
 146 +                if (udpredirect_csum_partial_copy_fromiovecend(to, iov, offset, len, &csum) < 0)
 147 +                        return -EFAULT;
 148 +                skb->csum = csum_block_add(skb->csum, csum, odd);
 149 +        }
 150 +        return 0;
 151 +}
 152 +
 153 +static int udpredirect_memcpy_fromiovecend(unsigned char *kdata, struct iovec *iov, int offset,
 154 +                        int len)
 155 +{
 156 +        /* Skip over the finished iovecs */
 157 +        while (offset >= iov->iov_len) {
 158 +                offset -= iov->iov_len;
 159 +                iov++;
 160 +        }
 161 +
 162 +        while (len > 0) {
 163 +                u8 __user *base = iov->iov_base + offset;
 164 +                int copy = min_t(unsigned int, len, iov->iov_len - offset);
 165 +
 166 +                offset = 0;
 167 +                memcpy(kdata, base, copy);
 168 +                len -= copy;
 169 +                kdata += copy;
 170 +                iov++;
 171 +        }
 172 +
 173 +        return 0;
 174 +}
 175 +
 176 +/*
 177 +   Copy of csum_partial_copy_fromiovecend() from iovec.c
 178 +   This function exists because no copy_from_user() is needed for udpredirect.
 179 +*/
 180 +
 181 +int udpredirect_csum_partial_copy_fromiovecend(unsigned char *kdata, struct iovec *iov,
 182 +                                int offset, unsigned int len, __wsum *csump)
 183 +{
 184 +       __wsum csum = *csump;
 185 +       int partial_cnt = 0, err = 0;
 186 +
 187 +       /* Skip over the finished iovecs */
 188 +       while (offset >= iov->iov_len) {
 189 +               offset -= iov->iov_len;
 190 +               iov++;
 191 +       }
 192 +
 193 +       while (len > 0) {
 194 +               u8 __user *base = iov->iov_base + offset;
 195 +               int copy = min_t(unsigned int, len, iov->iov_len - offset);
 196 +
 197 +               offset = 0;
 198 +
 199 +               /* There is a remnant from previous iov. */
 200 +               if (partial_cnt) {
 201 +                       int par_len = 4 - partial_cnt;
 202 +
 203 +                       /* iov component is too short ... */
 204 +                       if (par_len > copy) {
 205 +                               memcpy(kdata, base, copy);
 206 +                               kdata += copy;
 207 +                               base  += copy;
 208 +                               partial_cnt += copy;
 209 +                               len   -= copy;
 210 +                               iov++;
 211 +                               if (len)
 212 +                                       continue;
 213 +                               *csump = csum_partial(kdata - partial_cnt,
 214 +                                                        partial_cnt, csum);
 215 +                               goto out;
 216 +                       }
 217 +                       memcpy(kdata, base, par_len);
 218 +                       csum = csum_partial(kdata - partial_cnt, 4, csum);
 219 +                       kdata += par_len;
 220 +                       base  += par_len;
 221 +                       copy  -= par_len;
 222 +                       len   -= par_len;
 223 +                       partial_cnt = 0;
 224 +               }
 225 +
 226 +               if (len > copy) {
 227 +                       partial_cnt = copy % 4;
 228 +                       if (partial_cnt) {
 229 +                               copy -= partial_cnt;
 230 +                               memcpy(kdata + copy, base + copy, partial_cnt);
 231 +                       }
 232 +               }
 233 +
 234 +               if (copy) {
 235 +                       csum = csum_partial_copy_nocheck(base, kdata, copy, csum);
 236 +               }
 237 +               len   -= copy + partial_cnt;
 238 +               kdata += copy + partial_cnt;
 239 +               iov++;
 240 +       }
 241 +        *csump = csum;
 242 +out:
 243 +       return err;
 244 +}
 245 +
 246 +EXPORT_SYMBOL(udpredirect_getfrag);
 247 +EXPORT_SYMBOL(udp_do_redirect_fn);
 248 +EXPORT_SYMBOL(udpredirect_getfrag_fn);
 249 +#endif /* CONFIG_IFX_UDP_REDIRECT* */
 250 --- a/net/ipv4/Makefile
 251 +++ b/net/ipv4/Makefile
 252 @@ -14,6 +14,9 @@ obj-y     := route.o inetpeer.o protocol
 253              inet_fragment.o
 254
 255  obj-$(CONFIG_SYSCTL) += sysctl_net_ipv4.o
 256 +ifneq ($(CONFIG_IFX_UDP_REDIRECT),)
 257 +obj-$(CONFIG_IFX_UDP_REDIRECT) += udp_redirect_symb.o
 258 +endif
 259  obj-$(CONFIG_IP_FIB_HASH) += fib_hash.o
 260  obj-$(CONFIG_IP_FIB_TRIE) += fib_trie.o
 261  obj-$(CONFIG_PROC_FS) += proc.o
 262 --- a/net/ipv4/udp.c
 263 +++ b/net/ipv4/udp.c
 264 @@ -106,6 +106,10 @@
 265  #include <net/xfrm.h>
 266  #include "udp_impl.h"
 267
 268 +#if defined(CONFIG_IFX_UDP_REDIRECT) || defined(CONFIG_IFX_UDP_REDIRECT_MODULE)
 269 +#include <linux/udp_redirect.h>
 270 +#endif
 271 +
 272  struct udp_table udp_table __read_mostly;
 273  EXPORT_SYMBOL(udp_table);
 274
 275 @@ -782,7 +786,7 @@ int udp_sendmsg(struct kiocb *iocb, stru
 276         u8  tos;
 277         int err, is_udplite = IS_UDPLITE(sk);
 278         int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
 279 -       int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
 280 +       int (*getfrag)(void *, char *, int, int, int, struct sk_buff *) = NULL;
 281
 282         if (len > 0xFFFF)
 283                 return -EMSGSIZE;
 284 @@ -944,6 +948,12 @@ back_from_confirm:
 285
 286  do_append_data:
 287         up->len += ulen;
 288 +       /* UDPREDIRECT */
 289 +#if defined(CONFIG_IFX_UDP_REDIRECT) || defined(CONFIG_IFX_UDP_REDIRECT_MODULE)
 290 +       if(udpredirect_getfrag_fn && sk->sk_user_data == UDP_REDIRECT_MAGIC)
 291 +               getfrag = udpredirect_getfrag_fn;
 292 +       else
 293 +#endif /* IFX_UDP_REDIRECT */
 294         getfrag  =  is_udplite ?  udplite_getfrag : ip_generic_getfrag;
 295         err = ip_append_data(sk, getfrag, msg->msg_iov, ulen,
 296                         sizeof(struct udphdr), &ipc, &rt,
 297 @@ -1518,6 +1528,7 @@ int __udp4_lib_rcv(struct sk_buff *skb,
 298         struct rtable *rt = skb_rtable(skb);
 299         __be32 saddr, daddr;
 300         struct net *net = dev_net(skb->dev);
 301 +       int ret = 0;
 302
 303         /*
 304          *  Validate the packet.
 305 @@ -1550,7 +1561,16 @@ int __udp4_lib_rcv(struct sk_buff *skb,
 306         sk = __udp4_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
 307
 308         if (sk != NULL) {
 309 -               int ret = udp_queue_rcv_skb(sk, skb);
 310 +       /* UDPREDIRECT */
 311 +#if defined(CONFIG_IFX_UDP_REDIRECT) || defined(CONFIG_IFX_UDP_REDIRECT_MODULE)
 312 +      if(udp_do_redirect_fn && sk->sk_user_data == UDP_REDIRECT_MAGIC)
 313 +      {
 314 +         udp_do_redirect_fn(sk,skb);
 315 +         kfree_skb(skb);
 316 +         return(0);
 317 +      }
 318 +#endif
 319 +               ret = udp_queue_rcv_skb(sk, skb);
 320                 sock_put(sk);
 321
 322                 /* a return value > 0 means to resubmit the input, but
 323 @@ -1845,7 +1865,7 @@ struct proto udp_prot = {
 324  #endif
 325  };
 326  EXPORT_SYMBOL(udp_prot);
 327 -
 328 +EXPORT_SYMBOL(udp_rcv);
 329  /* ------------------------------------------------------------------------ */
 330  #ifdef CONFIG_PROC_FS
 331
 332 --- a/net/Kconfig
 333 +++ b/net/Kconfig
 334 @@ -72,6 +72,12 @@ config INET
 335
 336           Short answer: say Y.
 337
 338 +config IFX_UDP_REDIRECT
 339 +       bool "IFX Kernel Packet Interface for UDP redirection"
 340 +       help
 341 +         You can say Y here if you want to use hooks from kernel for
 342 +         UDP redirection.
 343 +
 344  if INET
 345  source "net/ipv4/Kconfig"
 346  source "net/ipv6/Kconfig"