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Added ipv4_pseudo_header structure

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This commit is contained in:
Nikhil Chandru Rao
2006-06-28 09:59:27 +00:00
parent e60817fa7a
commit 6e2c97b0c0
2 changed files with 16 additions and 21 deletions
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19
src/net/ipv4.c
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@@ -124,21 +124,18 @@ static void ipv4_dump ( struct iphdr *iphdr __unused ) {
void ipv4_tx_csum ( struct pk_buff *pkb, uint8_t trans_proto ) {
struct iphdr *iphdr = pkb->data;
void *pshdr = malloc ( IP_PSHLEN );
void *csum_offset = iphdr + IP_HLEN + ( trans_proto == IP_UDP ? 6 : 16 );
int offset = 0;
struct ipv4_pseudo_header pshdr;
void *csum_offset = iphdr + sizeof ( *iphdr ) + ( trans_proto == IP_UDP ? 6 : 16 );
/* Calculate pseudo header */
memcpy ( pshdr, &iphdr->src, sizeof ( in_addr ) );
offset += sizeof ( in_addr );
memcpy ( pshdr + offset, &iphdr->dest, sizeof ( in_addr ) );
offset += sizeof ( in_addr );
*( ( uint8_t* ) ( pshdr + offset++ ) ) = 0x00;
*( ( uint8_t* ) ( pshdr + offset++ ) ) = iphdr->protocol;
*( ( uint16_t* ) ( pshdr + offset ) ) = pkb_len ( pkb ) - IP_HLEN;
pshdr.src = iphdr->src;
pshdr.dest = iphdr->dest;
pshdr.zero_padding = 0x00;
pshdr.protocol = iphdr->protocol;
pshdr.len = htons ( pkb_len ( pkb ) - sizeof ( *iphdr ) );
/* Update the checksum value */
*( ( uint16_t* ) csum_offset ) = *( ( uint16_t* ) csum_offset ) + calc_chksum ( pshdr, IP_PSHLEN );
*( ( uint16_t* ) csum_offset ) = *( ( uint16_t* ) csum_offset ) + calc_chksum ( &pshdr, IP_PSHLEN );
}
/**