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netfilter: move checksum_partial indirection to struct nf_ipv6_ops

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We cannot make a direct call to nf_ip6_checksum_partial() because that
would result in autoloading the 'ipv6' module because of symbol
dependencies.  Therefore, define checksum_partial indirection in
nf_ipv6_ops where this really belongs to.

For IPv4, we can indeed make a direct function call, which is faster,
given IPv4 is built-in in the networking code by default. Still,
CONFIG_INET=n and CONFIG_NETFILTER=y is possible, so define empty inline
stub for IPv4 in such case.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso
2017-12-20 16:04:18 +01:00
parent ef71fe27ec
commit f7dcbe2f36
7 changed files with 50 additions and 38 deletions
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24
include/linux/netfilter.h
View File

@@ -311,11 +311,6 @@ struct nf_queue_entry;
struct nf_afinfo {
unsigned short family;
__sum16 (*checksum_partial)(struct sk_buff *skb,
unsigned int hook,
unsigned int dataoff,
unsigned int len,
u_int8_t protocol);
int (*route)(struct net *net, struct dst_entry **dst,
struct flowi *fl, bool strict);
void (*saveroute)(const struct sk_buff *skb,
@@ -335,22 +330,9 @@ __sum16 nf_checksum(struct sk_buff *skb, unsigned int hook,
unsigned int dataoff, u_int8_t protocol,
unsigned short family);
static inline __sum16
nf_checksum_partial(struct sk_buff *skb, unsigned int hook,
unsigned int dataoff, unsigned int len,
u_int8_t protocol, unsigned short family)
{
const struct nf_afinfo *afinfo;
__sum16 csum = 0;
rcu_read_lock();
afinfo = nf_get_afinfo(family);
if (afinfo)
csum = afinfo->checksum_partial(skb, hook, dataoff, len,
protocol);
rcu_read_unlock();
return csum;
}
__sum16 nf_checksum_partial(struct sk_buff *skb, unsigned int hook,
unsigned int dataoff, unsigned int len,
u_int8_t protocol, unsigned short family);
int nf_register_afinfo(const struct nf_afinfo *afinfo);
void nf_unregister_afinfo(const struct nf_afinfo *afinfo);

11
include/linux/netfilter_ipv4.h
View File

@@ -11,12 +11,23 @@ int ip_route_me_harder(struct net *net, struct sk_buff *skb, unsigned addr_type)
#ifdef CONFIG_INET
__sum16 nf_ip_checksum(struct sk_buff *skb, unsigned int hook,
unsigned int dataoff, u_int8_t protocol);
__sum16 nf_ip_checksum_partial(struct sk_buff *skb, unsigned int hook,
unsigned int dataoff, unsigned int len,
u_int8_t protocol);
#else
static inline __sum16 nf_ip_checksum(struct sk_buff *skb, unsigned int hook,
unsigned int dataoff, u_int8_t protocol)
{
return 0;
}
static inline __sum16 nf_ip_checksum_partial(struct sk_buff *skb,
unsigned int hook,
unsigned int dataoff,
unsigned int len,
u_int8_t protocol)
{
return 0;
}
#endif /* CONFIG_INET */
#endif /*__LINUX_IP_NETFILTER_H*/

3
include/linux/netfilter_ipv6.h
View File

@@ -21,6 +21,9 @@ struct nf_ipv6_ops {
int (*output)(struct net *, struct sock *, struct sk_buff *));
__sum16 (*checksum)(struct sk_buff *skb, unsigned int hook,
unsigned int dataoff, u_int8_t protocol);
__sum16 (*checksum_partial)(struct sk_buff *skb, unsigned int hook,
unsigned int dataoff, unsigned int len,
u_int8_t protocol);
};
#ifdef CONFIG_NETFILTER