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netfilter: move checksum_partial indirection to struct nf_ipv6_ops 

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

8
net/bridge/netfilter/nf_tables_bridge.c
View File

@ -106,13 +106,6 @@ static int nf_br_reroute(struct net *net, struct sk_buff *skb,
return 0;
}
static __sum16 nf_br_checksum_partial(struct sk_buff *skb, unsigned int hook,
unsigned int dataoff, unsigned int len,
u_int8_t protocol)
{
return 0;
}
static int nf_br_route(struct net *net, struct dst_entry **dst,
struct flowi *fl, bool strict __always_unused)
{
@ -121,7 +114,6 @@ static int nf_br_route(struct net *net, struct dst_entry **dst,
static const struct nf_afinfo nf_br_afinfo = {
.family = AF_BRIDGE,
.checksum_partial = nf_br_checksum_partial,
.route = nf_br_route,
.saveroute = nf_br_saveroute,
.reroute = nf_br_reroute,

8
net/ipv4/netfilter.c
View File

@ -155,9 +155,9 @@ __sum16 nf_ip_checksum(struct sk_buff *skb, unsigned int hook,
}
EXPORT_SYMBOL(nf_ip_checksum);
static __sum16 nf_ip_checksum_partial(struct sk_buff *skb, unsigned int hook,
unsigned int dataoff, unsigned int len,
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)
{
const struct iphdr *iph = ip_hdr(skb);
__sum16 csum = 0;
@ -175,6 +175,7 @@ static __sum16 nf_ip_checksum_partial(struct sk_buff *skb, unsigned int hook,
}
return csum;
}
EXPORT_SYMBOL_GPL(nf_ip_checksum_partial);
static int nf_ip_route(struct net *net, struct dst_entry **dst,
struct flowi *fl, bool strict __always_unused)
@ -188,7 +189,6 @@ static int nf_ip_route(struct net *net, struct dst_entry **dst,
static const struct nf_afinfo nf_ip_afinfo = {
.family = AF_INET,
.checksum_partial = nf_ip_checksum_partial,
.route = nf_ip_route,
.saveroute = nf_ip_saveroute,
.reroute = nf_ip_reroute,

10
net/ipv6/netfilter.c
View File

@ -190,15 +190,15 @@ static __sum16 nf_ip6_checksum_partial(struct sk_buff *skb, unsigned int hook,
};
static const struct nf_ipv6_ops ipv6ops = {
.chk_addr = ipv6_chk_addr,
.route_input = ip6_route_input,
.fragment = ip6_fragment,
.checksum = nf_ip6_checksum,
.chk_addr = ipv6_chk_addr,
.route_input = ip6_route_input,
.fragment = ip6_fragment,
.checksum = nf_ip6_checksum,
.checksum_partial = nf_ip6_checksum_partial,
};
static const struct nf_afinfo nf_ip6_afinfo = {
.family = AF_INET6,
.checksum_partial = nf_ip6_checksum_partial,
.route = nf_ip6_route,
.saveroute = nf_ip6_saveroute,
.reroute = nf_ip6_reroute,

24
net/netfilter/utils.c
View File

@ -24,3 +24,27 @@ __sum16 nf_checksum(struct sk_buff *skb, unsigned int hook,
return csum;
}
EXPORT_SYMBOL_GPL(nf_checksum);
__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_ipv6_ops *v6ops;
__sum16 csum = 0;
switch (family) {
case AF_INET:
csum = nf_ip_checksum_partial(skb, hook, dataoff, len,
protocol);
break;
case AF_INET6:
v6ops = rcu_dereference(nf_ipv6_ops);
if (v6ops)
csum = v6ops->checksum_partial(skb, hook, dataoff, len,
protocol);
break;
}
return csum;
}
EXPORT_SYMBOL_GPL(nf_checksum_partial);