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Message-Id: <20180108202000.12989-37-pablo@netfilter.org>
Date: Mon, 8 Jan 2018 21:19:44 +0100
From: Pablo Neira Ayuso <pablo@...filter.org>
To: netfilter-devel@...r.kernel.org
Cc: davem@...emloft.net, netdev@...r.kernel.org
Subject: [PATCH 36/52] netfilter: move route indirection to struct nf_ipv6_ops
We cannot make a direct call to nf_ip6_route() because that would result
in autoloading the 'ipv6' module because of symbol dependencies.
Therefore, define route 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@...filter.org>
---
include/linux/netfilter.h | 4 ++--
include/linux/netfilter_ipv4.h | 7 +++++++
include/linux/netfilter_ipv6.h | 2 ++
net/bridge/netfilter/nf_tables_bridge.c | 7 -------
net/ipv4/netfilter.c | 6 +++---
net/ipv6/netfilter.c | 2 +-
net/ipv6/netfilter/nft_fib_ipv6.c | 12 +++++-------
net/netfilter/nf_conntrack_h323_main.c | 30 +++++++++++++++---------------
net/netfilter/nft_rt.c | 15 +++++----------
net/netfilter/utils.c | 21 +++++++++++++++++++++
net/netfilter/xt_TCPMSS.c | 5 +----
net/netfilter/xt_addrtype.c | 15 ++++++---------
12 files changed, 68 insertions(+), 58 deletions(-)
diff --git a/include/linux/netfilter.h b/include/linux/netfilter.h
index 5fc2443225f9..02c35eabd348 100644
--- a/include/linux/netfilter.h
+++ b/include/linux/netfilter.h
@@ -311,8 +311,6 @@ struct nf_queue_entry;
struct nf_afinfo {
unsigned short family;
- int (*route)(struct net *net, struct dst_entry **dst,
- struct flowi *fl, bool strict);
int (*reroute)(struct net *net, struct sk_buff *skb,
const struct nf_queue_entry *entry);
int route_key_size;
@@ -331,6 +329,8 @@ __sum16 nf_checksum(struct sk_buff *skb, unsigned int hook,
__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_route(struct net *net, struct dst_entry **dst, struct flowi *fl,
+ bool strict, unsigned short family);
int nf_register_afinfo(const struct nf_afinfo *afinfo);
void nf_unregister_afinfo(const struct nf_afinfo *afinfo);
diff --git a/include/linux/netfilter_ipv4.h b/include/linux/netfilter_ipv4.h
index 8d4ef1e3ce74..2a4e2c415647 100644
--- a/include/linux/netfilter_ipv4.h
+++ b/include/linux/netfilter_ipv4.h
@@ -24,6 +24,8 @@ __sum16 nf_ip_checksum(struct sk_buff *skb, unsigned int hook,
__sum16 nf_ip_checksum_partial(struct sk_buff *skb, unsigned int hook,
unsigned int dataoff, unsigned int len,
u_int8_t protocol);
+int nf_ip_route(struct net *net, struct dst_entry **dst, struct flowi *fl,
+ bool strict);
#else
static inline __sum16 nf_ip_checksum(struct sk_buff *skb, unsigned int hook,
unsigned int dataoff, u_int8_t protocol)
@@ -38,6 +40,11 @@ static inline __sum16 nf_ip_checksum_partial(struct sk_buff *skb,
{
return 0;
}
+static inline int nf_ip_route(struct net *net, struct dst_entry **dst,
+ struct flowi *fl, bool strict)
+{
+ return -EOPNOTSUPP;
+}
#endif /* CONFIG_INET */
#endif /*__LINUX_IP_NETFILTER_H*/
diff --git a/include/linux/netfilter_ipv6.h b/include/linux/netfilter_ipv6.h
index 08d58dc018b5..e5700bb314a1 100644
--- a/include/linux/netfilter_ipv6.h
+++ b/include/linux/netfilter_ipv6.h
@@ -33,6 +33,8 @@ struct nf_ipv6_ops {
__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);
};
#ifdef CONFIG_NETFILTER
diff --git a/net/bridge/netfilter/nf_tables_bridge.c b/net/bridge/netfilter/nf_tables_bridge.c
index f38350c6bc29..014b6571f2ac 100644
--- a/net/bridge/netfilter/nf_tables_bridge.c
+++ b/net/bridge/netfilter/nf_tables_bridge.c
@@ -101,15 +101,8 @@ static int nf_br_reroute(struct net *net, struct sk_buff *skb,
return 0;
}
-static int nf_br_route(struct net *net, struct dst_entry **dst,
- struct flowi *fl, bool strict __always_unused)
-{
- return 0;
-}
-
static const struct nf_afinfo nf_br_afinfo = {
.family = AF_BRIDGE,
- .route = nf_br_route,
.reroute = nf_br_reroute,
.route_key_size = 0,
};
diff --git a/net/ipv4/netfilter.c b/net/ipv4/netfilter.c
index 7878ae6c35b2..e9d47e4ec182 100644
--- a/net/ipv4/netfilter.c
+++ b/net/ipv4/netfilter.c
@@ -150,8 +150,8 @@ __sum16 nf_ip_checksum_partial(struct sk_buff *skb, unsigned int hook,
}
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)
+int nf_ip_route(struct net *net, struct dst_entry **dst, struct flowi *fl,
+ bool strict __always_unused)
{
struct rtable *rt = ip_route_output_key(net, &fl->u.ip4);
if (IS_ERR(rt))
@@ -159,10 +159,10 @@ static int nf_ip_route(struct net *net, struct dst_entry **dst,
*dst = &rt->dst;
return 0;
}
+EXPORT_SYMBOL_GPL(nf_ip_route);
static const struct nf_afinfo nf_ip_afinfo = {
.family = AF_INET,
- .route = nf_ip_route,
.reroute = nf_ip_reroute,
.route_key_size = sizeof(struct ip_rt_info),
};
diff --git a/net/ipv6/netfilter.c b/net/ipv6/netfilter.c
index 6d1f470660db..f03bb043e4e4 100644
--- a/net/ipv6/netfilter.c
+++ b/net/ipv6/netfilter.c
@@ -170,11 +170,11 @@ static const struct nf_ipv6_ops ipv6ops = {
.fragment = ip6_fragment,
.checksum = nf_ip6_checksum,
.checksum_partial = nf_ip6_checksum_partial,
+ .route = nf_ip6_route,
};
static const struct nf_afinfo nf_ip6_afinfo = {
.family = AF_INET6,
- .route = nf_ip6_route,
.reroute = nf_ip6_reroute,
.route_key_size = sizeof(struct ip6_rt_info),
};
diff --git a/net/ipv6/netfilter/nft_fib_ipv6.c b/net/ipv6/netfilter/nft_fib_ipv6.c
index 54b5899543ef..cc5174c7254c 100644
--- a/net/ipv6/netfilter/nft_fib_ipv6.c
+++ b/net/ipv6/netfilter/nft_fib_ipv6.c
@@ -60,7 +60,6 @@ static u32 __nft_fib6_eval_type(const struct nft_fib *priv,
{
const struct net_device *dev = NULL;
const struct nf_ipv6_ops *v6ops;
- const struct nf_afinfo *afinfo;
int route_err, addrtype;
struct rt6_info *rt;
struct flowi6 fl6 = {
@@ -69,8 +68,8 @@ static u32 __nft_fib6_eval_type(const struct nft_fib *priv,
};
u32 ret = 0;
- afinfo = nf_get_afinfo(NFPROTO_IPV6);
- if (!afinfo)
+ v6ops = nf_get_ipv6_ops();
+ if (!v6ops)
return RTN_UNREACHABLE;
if (priv->flags & NFTA_FIB_F_IIF)
@@ -80,12 +79,11 @@ static u32 __nft_fib6_eval_type(const struct nft_fib *priv,
nft_fib6_flowi_init(&fl6, priv, pkt, dev, iph);
- v6ops = nf_get_ipv6_ops();
- if (dev && v6ops && v6ops->chk_addr(nft_net(pkt), &fl6.daddr, dev, true))
+ if (dev && v6ops->chk_addr(nft_net(pkt), &fl6.daddr, dev, true))
ret = RTN_LOCAL;
- route_err = afinfo->route(nft_net(pkt), (struct dst_entry **)&rt,
- flowi6_to_flowi(&fl6), false);
+ route_err = v6ops->route(nft_net(pkt), (struct dst_entry **)&rt,
+ flowi6_to_flowi(&fl6), false);
if (route_err)
goto err;
diff --git a/net/netfilter/nf_conntrack_h323_main.c b/net/netfilter/nf_conntrack_h323_main.c
index 7f0e0f66e488..005589c6d0f6 100644
--- a/net/netfilter/nf_conntrack_h323_main.c
+++ b/net/netfilter/nf_conntrack_h323_main.c
@@ -24,6 +24,7 @@
#include <linux/skbuff.h>
#include <net/route.h>
#include <net/ip6_route.h>
+#include <linux/netfilter_ipv6.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_core.h>
@@ -721,14 +722,8 @@ static int callforward_do_filter(struct net *net,
const union nf_inet_addr *dst,
u_int8_t family)
{
- const struct nf_afinfo *afinfo;
int ret = 0;
- /* rcu_read_lock()ed by nf_hook_thresh */
- afinfo = nf_get_afinfo(family);
- if (!afinfo)
- return 0;
-
switch (family) {
case AF_INET: {
struct flowi4 fl1, fl2;
@@ -739,10 +734,10 @@ static int callforward_do_filter(struct net *net,
memset(&fl2, 0, sizeof(fl2));
fl2.daddr = dst->ip;
- if (!afinfo->route(net, (struct dst_entry **)&rt1,
- flowi4_to_flowi(&fl1), false)) {
- if (!afinfo->route(net, (struct dst_entry **)&rt2,
- flowi4_to_flowi(&fl2), false)) {
+ if (!nf_ip_route(net, (struct dst_entry **)&rt1,
+ flowi4_to_flowi(&fl1), false)) {
+ if (!nf_ip_route(net, (struct dst_entry **)&rt2,
+ flowi4_to_flowi(&fl2), false)) {
if (rt_nexthop(rt1, fl1.daddr) ==
rt_nexthop(rt2, fl2.daddr) &&
rt1->dst.dev == rt2->dst.dev)
@@ -755,18 +750,23 @@ static int callforward_do_filter(struct net *net,
}
#if IS_ENABLED(CONFIG_NF_CONNTRACK_IPV6)
case AF_INET6: {
- struct flowi6 fl1, fl2;
+ const struct nf_ipv6_ops *v6ops;
struct rt6_info *rt1, *rt2;
+ struct flowi6 fl1, fl2;
+
+ v6ops = nf_get_ipv6_ops();
+ if (!v6ops)
+ return 0;
memset(&fl1, 0, sizeof(fl1));
fl1.daddr = src->in6;
memset(&fl2, 0, sizeof(fl2));
fl2.daddr = dst->in6;
- if (!afinfo->route(net, (struct dst_entry **)&rt1,
- flowi6_to_flowi(&fl1), false)) {
- if (!afinfo->route(net, (struct dst_entry **)&rt2,
- flowi6_to_flowi(&fl2), false)) {
+ if (!v6ops->route(net, (struct dst_entry **)&rt1,
+ flowi6_to_flowi(&fl1), false)) {
+ if (!v6ops->route(net, (struct dst_entry **)&rt2,
+ flowi6_to_flowi(&fl2), false)) {
if (ipv6_addr_equal(rt6_nexthop(rt1, &fl1.daddr),
rt6_nexthop(rt2, &fl2.daddr)) &&
rt1->dst.dev == rt2->dst.dev)
diff --git a/net/netfilter/nft_rt.c b/net/netfilter/nft_rt.c
index a6b7d05aeacf..11a2071b6dd4 100644
--- a/net/netfilter/nft_rt.c
+++ b/net/netfilter/nft_rt.c
@@ -27,7 +27,7 @@ static u16 get_tcpmss(const struct nft_pktinfo *pkt, const struct dst_entry *skb
{
u32 minlen = sizeof(struct ipv6hdr), mtu = dst_mtu(skbdst);
const struct sk_buff *skb = pkt->skb;
- const struct nf_afinfo *ai;
+ struct dst_entry *dst = NULL;
struct flowi fl;
memset(&fl, 0, sizeof(fl));
@@ -43,15 +43,10 @@ static u16 get_tcpmss(const struct nft_pktinfo *pkt, const struct dst_entry *skb
break;
}
- ai = nf_get_afinfo(nft_pf(pkt));
- if (ai) {
- struct dst_entry *dst = NULL;
-
- ai->route(nft_net(pkt), &dst, &fl, false);
- if (dst) {
- mtu = min(mtu, dst_mtu(dst));
- dst_release(dst);
- }
+ nf_route(nft_net(pkt), &dst, &fl, false, nft_pf(pkt));
+ if (dst) {
+ mtu = min(mtu, dst_mtu(dst));
+ dst_release(dst);
}
if (mtu <= minlen || mtu > 0xffff)
diff --git a/net/netfilter/utils.c b/net/netfilter/utils.c
index ca6d8d62496d..45c22418c955 100644
--- a/net/netfilter/utils.c
+++ b/net/netfilter/utils.c
@@ -48,3 +48,24 @@ __sum16 nf_checksum_partial(struct sk_buff *skb, unsigned int hook,
return csum;
}
EXPORT_SYMBOL_GPL(nf_checksum_partial);
+
+int nf_route(struct net *net, struct dst_entry **dst, struct flowi *fl,
+ bool strict, unsigned short family)
+{
+ const struct nf_ipv6_ops *v6ops;
+ int ret = 0;
+
+ switch (family) {
+ case AF_INET:
+ ret = nf_ip_route(net, dst, fl, strict);
+ break;
+ case AF_INET6:
+ v6ops = rcu_dereference(nf_ipv6_ops);
+ if (v6ops)
+ ret = v6ops->route(net, dst, fl, strict);
+ break;
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(nf_route);
diff --git a/net/netfilter/xt_TCPMSS.c b/net/netfilter/xt_TCPMSS.c
index 9dae4d665965..99bb8e410f22 100644
--- a/net/netfilter/xt_TCPMSS.c
+++ b/net/netfilter/xt_TCPMSS.c
@@ -48,7 +48,6 @@ static u_int32_t tcpmss_reverse_mtu(struct net *net,
unsigned int family)
{
struct flowi fl;
- const struct nf_afinfo *ai;
struct rtable *rt = NULL;
u_int32_t mtu = ~0U;
@@ -62,10 +61,8 @@ static u_int32_t tcpmss_reverse_mtu(struct net *net,
memset(fl6, 0, sizeof(*fl6));
fl6->daddr = ipv6_hdr(skb)->saddr;
}
- ai = nf_get_afinfo(family);
- if (ai != NULL)
- ai->route(net, (struct dst_entry **)&rt, &fl, false);
+ nf_route(net, (struct dst_entry **)&rt, &fl, false, family);
if (rt != NULL) {
mtu = dst_mtu(&rt->dst);
dst_release(&rt->dst);
diff --git a/net/netfilter/xt_addrtype.c b/net/netfilter/xt_addrtype.c
index 3b2be2ae6987..911a7c0da504 100644
--- a/net/netfilter/xt_addrtype.c
+++ b/net/netfilter/xt_addrtype.c
@@ -36,7 +36,7 @@ MODULE_ALIAS("ip6t_addrtype");
static u32 match_lookup_rt6(struct net *net, const struct net_device *dev,
const struct in6_addr *addr, u16 mask)
{
- const struct nf_afinfo *afinfo;
+ const struct nf_ipv6_ops *v6ops;
struct flowi6 flow;
struct rt6_info *rt;
u32 ret = 0;
@@ -47,17 +47,14 @@ static u32 match_lookup_rt6(struct net *net, const struct net_device *dev,
if (dev)
flow.flowi6_oif = dev->ifindex;
- afinfo = nf_get_afinfo(NFPROTO_IPV6);
- if (afinfo != NULL) {
- const struct nf_ipv6_ops *v6ops;
-
+ v6ops = nf_get_ipv6_ops();
+ if (v6ops) {
if (dev && (mask & XT_ADDRTYPE_LOCAL)) {
- v6ops = nf_get_ipv6_ops();
- if (v6ops && v6ops->chk_addr(net, addr, dev, true))
+ if (v6ops->chk_addr(net, addr, dev, true))
ret = XT_ADDRTYPE_LOCAL;
}
- route_err = afinfo->route(net, (struct dst_entry **)&rt,
- flowi6_to_flowi(&flow), false);
+ route_err = v6ops->route(net, (struct dst_entry **)&rt,
+ flowi6_to_flowi(&flow), false);
} else {
route_err = 1;
}
--
2.11.0
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