hello,
1) In 2.4 kernel series skbuff.h has following unions
for each TCP/IP layer.
/*Transport Layer*/
union
{
struct tcphdr *th;
struct udphdr *uh;
struct icmphdr *icmph;
struct igmphdr *igmph;
struct iphdr *ipiph;
struct spxhdr *spxh;
unsigned char *raw;
} h;
/* Network layer header */
union
{
struct iphdr *iph;
struct ipv6hdr *ipv6h;
struct arphdr *arph;
struct ipxhdr *ipxh;
unsigned char *raw;
} nh;
/* Link layer header */
union
{
struct ethhdr *ethernet;
unsigned char *raw;
} mac;
AND In 2.6 kernel series skbuff.h has following unions
for each TCP/IP layer.
union {
struct tcphdr *th;
struct udphdr *uh;
struct icmphdr *icmph;
struct igmphdr *igmph;
struct iphdr *ipiph;
struct ipv6hdr *ipv6h;
unsigned char *raw;
} h;
union {
struct iphdr *iph;
struct ipv6hdr *ipv6h;
struct arphdr *arph;
unsigned char *raw;
} nh;
union {
unsigned char *raw;
} mac;
why mac union in 2.6 not have ethernet header? Also
spxhdr and ipxhdr structures are removed from nh and h
unions.
2) Why header structures for ipcomp,eh,esp(IPSEC) not
included in skbuff.h?
Then how can skbuff adds/removes those headers in
skbuff?
regards,
linux_lover
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