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compat_xtables: fix compilation with <= 2.6.19

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Once upon a time there was no such checksumming...
This commit is contained in:
Jan Engelhardt
2009-04-30 20:23:52 +02:00
parent 637516f2d4
commit 73e7b5ead1
4 changed files with 34 additions and 10 deletions
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17
extensions/compat_xtables.c
View File

@@ -20,11 +20,6 @@
#include "compat_skbuff.h"
#include "compat_xtnu.h"
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 19)
typedef __u16 __bitwise __sum16;
typedef __u32 __bitwise __wsum;
#endif
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 22)
static int xtnu_match_run(const struct sk_buff *skb,
const struct net_device *in, const struct net_device *out,
@@ -452,17 +447,23 @@ void xtnu_proto_csum_replace4(__sum16 *sum, struct sk_buff *skb,
__be32 from, __be32 to, bool pseudohdr)
{
__be32 diff[] = {~from, to};
const void *dv = diff; /* kludge for < v2.6.19-555-g72685fc */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 19)
if (skb->ip_summed != CHECKSUM_PARTIAL) {
*sum = csum_fold(csum_partial(diff, sizeof(diff),
*sum = csum_fold(csum_partial(dv, sizeof(diff),
~csum_unfold(*sum)));
if (skb->ip_summed == CHECKSUM_COMPLETE && pseudohdr)
skb->csum = ~csum_partial(diff, sizeof(diff),
skb->csum = ~csum_partial(dv, sizeof(diff),
~skb->csum);
} else if (pseudohdr) {
*sum = ~csum_fold(csum_partial(diff, sizeof(diff),
*sum = ~csum_fold(csum_partial(dv, sizeof(diff),
csum_unfold(*sum)));
}
#else
*sum = csum_fold(csum_partial(dv, sizeof(diff),
~csum_unfold(*sum)));
#endif
}
EXPORT_SYMBOL_GPL(xtnu_proto_csum_replace4);
#endif

2
extensions/compat_xtables.h
View File

@@ -37,6 +37,7 @@
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 19)
# define neigh_hh_output xtnu_neigh_hh_output
# define IPPROTO_UDPLITE 136
# define CSUM_MANGLED_0 ((__force __sum16)0xffff)
#endif
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 24)
@@ -70,6 +71,7 @@
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 19)
# define csum_replace2 xtnu_csum_replace2
# define csum_replace4 xtnu_csum_replace4
# define inet_proto_csum_replace4 xtnu_proto_csum_replace4
#elif LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 24)
# define csum_replace2 nf_csum_replace2
# define csum_replace4 nf_csum_replace4

11
extensions/compat_xtnu.h
View File

@@ -9,6 +9,10 @@
typedef _Bool bool;
enum { false = 0, true = 1, };
#endif
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 19)
typedef __u16 __bitwise __sum16;
typedef __u32 __bitwise __wsum;
#endif
struct flowi;
struct hh_cache;
@@ -122,6 +126,13 @@ static inline struct xtnu_target *xtcompat_nutarget(const struct xt_target *t)
return q;
}
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 19)
static inline __wsum csum_unfold(__sum16 n)
{
return (__force __wsum)n;
}
#endif
extern int xtnu_ip_local_out(struct sk_buff *);
extern int xtnu_ip_route_me_harder(struct sk_buff **, unsigned int);
extern int xtnu_skb_make_writable(struct sk_buff **, unsigned int);

14
extensions/xt_RAWNAT.c
View File

@@ -79,6 +79,7 @@ static void rawnat4_update_l4(struct sk_buff *skb, __be32 oldip, __be32 newip)
void *transport_hdr = (void *)iph + ip_hdrlen(skb);
struct tcphdr *tcph;
struct udphdr *udph;
bool cond;
switch (iph->protocol) {
case IPPROTO_TCP:
@@ -88,7 +89,11 @@ static void rawnat4_update_l4(struct sk_buff *skb, __be32 oldip, __be32 newip)
case IPPROTO_UDP:
case IPPROTO_UDPLITE:
udph = transport_hdr;
if (udph->check != 0 || skb->ip_summed == CHECKSUM_PARTIAL) {
cond = udph->check != 0;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 19)
cond |= skb->ip_summed == CHECKSUM_PARTIAL;
#endif
if (cond) {
inet_proto_csum_replace4(&udph->check, skb,
oldip, newip, true);
if (udph->check == 0)
@@ -200,6 +205,7 @@ static void rawnat6_update_l4(struct sk_buff *skb, unsigned int l4proto,
struct tcphdr *tcph;
struct udphdr *udph;
unsigned int i;
bool cond;
switch (l4proto) {
case IPPROTO_TCP:
@@ -211,7 +217,11 @@ static void rawnat6_update_l4(struct sk_buff *skb, unsigned int l4proto,
case IPPROTO_UDP:
case IPPROTO_UDPLITE:
udph = (void *)iph + l4offset;
if (udph->check != 0 || skb->ip_summed == CHECKSUM_PARTIAL) {
cond = udph->check;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 19)
cond |= skb->ip_summed == CHECKSUM_PARTIAL;
#endif
if (cond) {
for (i = 0; i < 4; ++i)
inet_proto_csum_replace4(&udph->check, skb,
oldip->s6_addr32[i],