Commit fb8daa62 authored by Sridhar Samudrala's avatar Sridhar Samudrala

[SCTP] Handle non-linear ip re-assembled skb's in sctp_rcv()

parent 41c6b812
/* SCTP kernel reference Implementation
* Copyright (c) 1999-2000 Cisco, Inc.
* Copyright (c) 1999-2001 Motorola, Inc.
* Copyright (c) 2001-2002 International Business Machines, Corp.
* Copyright (c) 2001-2003 International Business Machines, Corp.
* Copyright (c) 2001 Intel Corp.
*
* This file is part of the SCTP kernel reference Implementation
......@@ -37,6 +37,7 @@
* Xingang Guo <xingang.guo@intel.com>
* Jon Grimm <jgrimm@us.ibm.com>
* Daisy Chang <daisyc@us.ibm.com>
* Sridhar Samudrala <sri@us.ibm.com>
*
* Any bugs reported given to us we will try to fix... any fixes shared will
* be incorporated into the next SCTP release.
......@@ -147,7 +148,9 @@ extern int sctp_primitive_REQUESTHEARTBEAT(sctp_association_t *, void *arg);
/*
* sctp_crc32c.c
*/
extern __u32 count_crc(__u8 *ptr, __u16 count);
extern __u32 sctp_start_cksum(__u8 *ptr, __u16 count);
extern __u32 sctp_update_cksum(__u8 *ptr, __u16 count, __u32 cksum);
extern __u32 sctp_end_cksum(__u32 cksum);
/*
* sctp_input.c
......
/* SCTP kernel reference Implementation
* Copyright (c) 1999-2000 Cisco, Inc.
* Copyright (c) 1999-2001 Motorola, Inc.
* Copyright (c) 2003 International Business Machines, Corp.
*
* This file is part of the SCTP kernel reference Implementation
*
......@@ -36,6 +37,7 @@
* Randall Stewart <rstewar1@email.mot.com>
* Ken Morneau <kmorneau@cisco.com>
* Qiaobing Xie <qxie1@email.mot.com>
* Sridhar Samudrala <sri@us.ibm.com>
*
* Any bugs reported given to us we will try to fix... any fixes shared will
* be incorporated into the next SCTP release.
......@@ -122,7 +124,7 @@ unsigned long update_adler32(unsigned long adler,
return (s2 << 16) + s1;
}
__u32 count_crc(__u8 *ptr, __u16 count)
__u32 sctp_start_cksum(__u8 *ptr, __u16 count)
{
/*
* Update a running Adler-32 checksum with the bytes
......@@ -146,3 +148,15 @@ __u32 count_crc(__u8 *ptr, __u16 count)
return adler;
}
__u32 sctp_update_cksum(__u8 *ptr, __u16 count, __u32 adler)
{
adler = update_adler32(adler, ptr, count);
return adler;
}
__u32 sctp_end_cksum(__u32 adler)
{
return adler;
}
/* SCTP kernel reference Implementation
* Copyright (c) 1999-2001 Motorola, Inc.
* Copyright (c) 2001 International Business Machines, Corp.
* Copyright (c) 2001-2003 International Business Machines, Corp.
*
* This file is part of the SCTP kernel reference Implementation
*
......@@ -33,6 +33,7 @@
* Written or modified by:
* Dinakaran Joseph
* Jon Grimm <jgrimm@us.ibm.com>
* Sridhar Samudrala <sri@us.ibm.com>
*
* Any bugs reported given to us we will try to fix... any fixes shared will
* be incorporated into the next SCTP release.
......@@ -135,11 +136,10 @@ __u32 crc_c[256] = {
0xBE2DA0A5, 0x4C4623A6, 0x5F16D052, 0xAD7D5351,
};
__u32 count_crc(__u8 *buffer, __u16 length)
__u32 sctp_start_cksum(__u8 *buffer, __u16 length)
{
__u32 crc32 = ~(__u32) 0;
__u32 i, result;
__u8 byte0, byte1, byte2, byte3;
__u32 i;
/* Optimize this routine to be SCTP specific, knowing how
* to skip the checksum field of the SCTP header.
......@@ -157,6 +157,24 @@ __u32 count_crc(__u8 *buffer, __u16 length)
for (i = sizeof(struct sctphdr); i < length ; i++)
CRC32C(crc32, buffer[i]);
return crc32;
}
__u32 sctp_update_cksum(__u8 *buffer, __u16 length, __u32 crc32)
{
__u32 i;
for (i = 0; i < length ; i++)
CRC32C(crc32, buffer[i]);
return crc32;
}
__u32 sctp_end_cksum(__u32 crc32)
{
__u32 result;
__u8 byte0, byte1, byte2, byte3;
result = ~crc32;
/* result now holds the negated polynomial remainder;
......@@ -183,5 +201,3 @@ __u32 count_crc(__u8 *buffer, __u16 length)
byte3);
return crc32;
}
/* SCTP kernel reference Implementation
* Copyright (c) 1999-2000 Cisco, Inc.
* Copyright (c) 1999-2001 Motorola, Inc.
* Copyright (c) 2001 International Business Machines, Corp.
* Copyright (c) 2001-2003 International Business Machines, Corp.
* Copyright (c) 2001 Intel Corp.
* Copyright (c) 2001 Nokia, Inc.
* Copyright (c) 2001 La Monte H.P. Yarroll
......@@ -72,10 +72,19 @@ static inline int sctp_rcv_checksum(struct sk_buff *skb)
{
struct sctphdr *sh;
__u32 cmp, val;
struct sk_buff *list = skb_shinfo(skb)->frag_list;
sh = (struct sctphdr *) skb->h.raw;
cmp = ntohl(sh->checksum);
val = count_crc((__u8 *)sh, skb->len);
val = sctp_start_cksum((__u8 *)sh, skb_headlen(skb));
for (; list; list = list->next)
val = sctp_update_cksum((__u8 *)list->data, skb_headlen(list),
val);
val = sctp_end_cksum(val);
if (val != cmp) {
/* CRC failure, dump it. */
return -1;
......
/* SCTP kernel reference Implementation
* Copyright (c) 1999-2000 Cisco, Inc.
* Copyright (c) 1999-2001 Motorola, Inc.
* Copyright (c) 2001 International Business Machines, Corp.
* Copyright (c) 2001-2003 International Business Machines, Corp.
*
* This file is part of the SCTP kernel reference Implementation
*
......@@ -62,7 +62,6 @@
#include <net/sctp/sm.h>
/* Forward declarations for private helpers. */
__u32 count_crc(__u8 *ptr, __u16 count);
static void sctp_packet_reset(sctp_packet_t *packet);
static sctp_xmit_t sctp_packet_append_data(sctp_packet_t *packet,
sctp_chunk_t *chunk);
......@@ -358,7 +357,8 @@ int sctp_packet_transmit(sctp_packet_t *packet)
* Note: Adler-32 is no longer applicable, as has been replaced
* by CRC32-C as described in <draft-ietf-tsvwg-sctpcsum-02.txt>.
*/
crc32 = count_crc((__u8 *)sh, nskb->len);
crc32 = sctp_start_cksum((__u8 *)sh, nskb->len);
crc32 = sctp_end_cksum(crc32);
/* 3) Put the resultant value into the checksum field in the
* common header, and leave the rest of the bits unchanged.
......
/* Copyright (c) 1999-2000 Cisco, Inc.
* Copyright (c) 1999-2001 Motorola, Inc.
* Copyright (c) 2001-2002 International Business Machines, Corp.
* Copyright (c) 2001-2003 International Business Machines, Corp.
* Copyright (c) 2001-2002 Intel Corp.
* Copyright (c) 2001-2002 Nokia, Inc.
* Copyright (c) 2001 La Monte H.P. Yarroll
......@@ -1091,18 +1091,25 @@ SCTP_STATIC int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
static int sctp_skb_pull(struct sk_buff *skb, int len)
{
struct sk_buff *list;
int skb_len = skb_headlen(skb);
int rlen;
if (len <= skb->len) {
if (len <= skb_len) {
__skb_pull(skb, len);
return 0;
}
len -= skb->len;
__skb_pull(skb, skb->len);
len -= skb_len;
__skb_pull(skb, skb_len);
for (list = skb_shinfo(skb)->frag_list; list; list = list->next) {
len = sctp_skb_pull(list, len);
if (!len)
rlen = sctp_skb_pull(list, len);
skb->len -= (len-rlen);
skb->data_len -= (len-rlen);
if (!rlen)
return 0;
len = rlen;
}
return len;
......@@ -1130,7 +1137,7 @@ SCTP_STATIC int sctp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr
{
sctp_ulpevent_t *event = NULL;
sctp_opt_t *sp = sctp_sk(sk);
struct sk_buff *skb, *list;
struct sk_buff *skb;
int copied;
int err = 0;
int skb_len;
......@@ -1154,8 +1161,6 @@ SCTP_STATIC int sctp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr
* frag_list.
*/
skb_len = skb->len;
for (list = skb_shinfo(skb)->frag_list; list; list = list->next)
skb_len += list->len;
copied = skb_len;
if (copied > len)
......
/* SCTP kernel reference Implementation
* Copyright (c) 1999-2000 Cisco, Inc.
* Copyright (c) 1999-2001 Motorola, Inc.
* Copyright (c) 2001-2002 International Business Machines, Corp.
* Copyright (c) 2001-2003 International Business Machines, Corp.
* Copyright (c) 2001 Intel Corp.
* Copyright (c) 2001 Nokia, Inc.
* Copyright (c) 2001 La Monte H.P. Yarroll
......@@ -233,23 +233,41 @@ static inline void sctp_ulpqueue_store_reasm(sctp_ulpqueue_t *ulpq, sctp_ulpeven
/* Helper function to return an event corresponding to the reassembled
* datagram.
* This routine creates a re-assembled skb given the first and last skb's
* as stored in the reassembly queue. The skb's may be non-linear if the sctp
* payload was fragmented on the way and ip had to reassemble them.
* We add the rest of skb's to the first skb's fraglist.
*/
static inline sctp_ulpevent_t *sctp_make_reassembled_event(struct sk_buff *f_frag, struct sk_buff *l_frag)
{
struct sk_buff *pos;
sctp_ulpevent_t *event;
struct sk_buff *pnext;
struct sk_buff *pnext, *last;
struct sk_buff *list = skb_shinfo(f_frag)->frag_list;
/* Store the pointer to the 2nd skb */
pos = f_frag->next;
/* Set the first fragment's frag_list to point to the 2nd fragment. */
skb_shinfo(f_frag)->frag_list = pos;
/* Get the last skb in the f_frag's frag_list if present. */
for (last = list; list; last = list,list = list->next);
/* Add the list of remaining fragments to the first fragments
* frag_list.
*/
if (last)
last->next = pos;
else
skb_shinfo(f_frag)->frag_list = pos;
/* Remove the first fragment from the reassembly queue. */
__skb_unlink(f_frag, f_frag->list);
do {
pnext = pos->next;
/* Update the len and data_len fields of the first fragment. */
f_frag->len += pos->len;
f_frag->data_len += pos->len;
/* Remove the fragment from the reassembly queue. */
__skb_unlink(pos, pos->list);
......
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