commit 11052589cf5c0bab3b4884d423d5f60c38fcf25d upstream
Commit e21145a9871a ("ipv4: namespacify ip_early_demux sysctl knob") made
it possible to enable/disable early_demux on a per-netns basis. Then, we
introduced two knobs, tcp_early_demux and udp_early_demux, to switch it for
TCP/UDP in commit dddb64bcb346 ("net: Add sysctl to toggle early demux for
tcp and udp"). However, the .proc_handler() was wrong and actually
disabled us from changing the behaviour in each netns.
We can execute early_demux if net.ipv4.ip_early_demux is on and each proto
.early_demux() handler is not NULL. When we toggle (tcp|udp)_early_demux,
the change itself is saved in each netns variable, but the .early_demux()
handler is a global variable, so the handler is switched based on the
init_net's sysctl variable. Thus, netns (tcp|udp)_early_demux knobs have
nothing to do with the logic. Whether we CAN execute proto .early_demux()
is always decided by init_net's sysctl knob, and whether we DO it or not is
by each netns ip_early_demux knob.
This patch namespacifies (tcp|udp)_early_demux again. For now, the users
of the .early_demux() handler are TCP and UDP only, and they are called
directly to avoid retpoline. So, we can remove the .early_demux() handler
from inet6?_protos and need not dereference them in ip6?_rcv_finish_core().
If another proto needs .early_demux(), we can restore it at that time.
Fixes: dddb64bcb346 ("net: Add sysctl to toggle early demux for tcp and udp")
Signed-off-by: Kuniyuki Iwashima <kuniyu@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20220713175207.7727-1-kuniyu@xxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
---
include/net/protocol.h | 4 ---
include/net/tcp.h | 2 ++
include/net/udp.h | 1 +
net/ipv4/af_inet.c | 14 ++-------
net/ipv4/ip_input.c | 37 ++++++++++++++----------
net/ipv4/sysctl_net_ipv4.c | 59 ++------------------------------------
net/ipv6/ip6_input.c | 26 ++++++++++-------
net/ipv6/tcp_ipv6.c | 9 ++----
net/ipv6/udp.c | 9 ++----
9 files changed, 48 insertions(+), 113 deletions(-)
diff --git a/include/net/protocol.h b/include/net/protocol.h
index 2b778e1d2d8f..0fd2df844fc7 100644
--- a/include/net/protocol.h
+++ b/include/net/protocol.h
@@ -35,8 +35,6 @@
/* This is used to register protocols. */
struct net_protocol {
- int (*early_demux)(struct sk_buff *skb);
- int (*early_demux_handler)(struct sk_buff *skb);
int (*handler)(struct sk_buff *skb);
/* This returns an error if we weren't able to handle the error. */
@@ -53,8 +51,6 @@ struct net_protocol {
#if IS_ENABLED(CONFIG_IPV6)
struct inet6_protocol {
- void (*early_demux)(struct sk_buff *skb);
- void (*early_demux_handler)(struct sk_buff *skb);
int (*handler)(struct sk_buff *skb);
/* This returns an error if we weren't able to handle the error. */
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 5b2473a08241..077feeca6c99 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -922,6 +922,8 @@ static inline int tcp_v6_sdif(const struct sk_buff *skb)
#endif
return 0;
}
+
+void tcp_v6_early_demux(struct sk_buff *skb);
#endif
static inline bool inet_exact_dif_match(struct net *net, struct sk_buff *skb)
diff --git a/include/net/udp.h b/include/net/udp.h
index e66854e767dc..bbd607fb939a 100644
--- a/include/net/udp.h
+++ b/include/net/udp.h
@@ -169,6 +169,7 @@ typedef struct sock *(*udp_lookup_t)(struct sk_buff *skb, __be16 sport,
struct sk_buff *udp_gro_receive(struct list_head *head, struct sk_buff *skb,
struct udphdr *uh, udp_lookup_t lookup);
int udp_gro_complete(struct sk_buff *skb, int nhoff, udp_lookup_t lookup);
+void udp_v6_early_demux(struct sk_buff *skb);
struct sk_buff *__udp_gso_segment(struct sk_buff *gso_skb,
netdev_features_t features);
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index 058dbcb90541..3c6412cb4b48 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -1702,12 +1702,7 @@ static const struct net_protocol igmp_protocol = {
};
#endif
-/* thinking of making this const? Don't.
- * early_demux can change based on sysctl.
- */
-static struct net_protocol tcp_protocol = {
- .early_demux = tcp_v4_early_demux,
- .early_demux_handler = tcp_v4_early_demux,
+static const struct net_protocol tcp_protocol = {
.handler = tcp_v4_rcv,
.err_handler = tcp_v4_err,
.no_policy = 1,
@@ -1715,12 +1710,7 @@ static struct net_protocol tcp_protocol = {
.icmp_strict_tag_validation = 1,
};
-/* thinking of making this const? Don't.
- * early_demux can change based on sysctl.
- */
-static struct net_protocol udp_protocol = {
- .early_demux = udp_v4_early_demux,
- .early_demux_handler = udp_v4_early_demux,
+static const struct net_protocol udp_protocol = {
.handler = udp_rcv,
.err_handler = udp_err,
.no_policy = 1,
diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c
index c59a78a267c3..1464e2738211 100644
--- a/net/ipv4/ip_input.c
+++ b/net/ipv4/ip_input.c
@@ -302,31 +302,38 @@ static inline bool ip_rcv_options(struct sk_buff *skb, struct net_device *dev)
return true;
}
-INDIRECT_CALLABLE_DECLARE(int udp_v4_early_demux(struct sk_buff *));
-INDIRECT_CALLABLE_DECLARE(int tcp_v4_early_demux(struct sk_buff *));
+int udp_v4_early_demux(struct sk_buff *);
+int tcp_v4_early_demux(struct sk_buff *);
static int ip_rcv_finish_core(struct net *net, struct sock *sk,
struct sk_buff *skb, struct net_device *dev)
{
const struct iphdr *iph = ip_hdr(skb);
- int (*edemux)(struct sk_buff *skb);
struct rtable *rt;
int err;
- if (net->ipv4.sysctl_ip_early_demux &&
+ if (READ_ONCE(net->ipv4.sysctl_ip_early_demux) &&
!skb_dst(skb) &&
!skb->sk &&
!ip_is_fragment(iph)) {
- const struct net_protocol *ipprot;
- int protocol = iph->protocol;
-
- ipprot = rcu_dereference(inet_protos[protocol]);
- if (ipprot && (edemux = READ_ONCE(ipprot->early_demux))) {
- err = INDIRECT_CALL_2(edemux, tcp_v4_early_demux,
- udp_v4_early_demux, skb);
- if (unlikely(err))
- goto drop_error;
- /* must reload iph, skb->head might have changed */
- iph = ip_hdr(skb);
+ switch (iph->protocol) {
+ case IPPROTO_TCP:
+ if (READ_ONCE(net->ipv4.sysctl_tcp_early_demux)) {
+ tcp_v4_early_demux(skb);
+
+ /* must reload iph, skb->head might have changed */
+ iph = ip_hdr(skb);
+ }
+ break;
+ case IPPROTO_UDP:
+ if (READ_ONCE(net->ipv4.sysctl_udp_early_demux)) {
+ err = udp_v4_early_demux(skb);
+ if (unlikely(err))
+ goto drop_error;
+
+ /* must reload iph, skb->head might have changed */
+ iph = ip_hdr(skb);
+ }
+ break;
}
}
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index c83a5d05aeaa..4d4dba1d42ae 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -363,61 +363,6 @@ static int proc_tcp_fastopen_key(struct ctl_table *table, int write,
return ret;
}
-static void proc_configure_early_demux(int enabled, int protocol)
-{
- struct net_protocol *ipprot;
-#if IS_ENABLED(CONFIG_IPV6)
- struct inet6_protocol *ip6prot;
-#endif
-
- rcu_read_lock();
-
- ipprot = rcu_dereference(inet_protos[protocol]);
- if (ipprot)
- ipprot->early_demux = enabled ? ipprot->early_demux_handler :
- NULL;
-
-#if IS_ENABLED(CONFIG_IPV6)
- ip6prot = rcu_dereference(inet6_protos[protocol]);
- if (ip6prot)
- ip6prot->early_demux = enabled ? ip6prot->early_demux_handler :
- NULL;
-#endif
- rcu_read_unlock();
-}
-
-static int proc_tcp_early_demux(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp, loff_t *ppos)
-{
- int ret = 0;
-
- ret = proc_dointvec(table, write, buffer, lenp, ppos);
-
- if (write && !ret) {
- int enabled = init_net.ipv4.sysctl_tcp_early_demux;
-
- proc_configure_early_demux(enabled, IPPROTO_TCP);
- }
-
- return ret;
-}
-
-static int proc_udp_early_demux(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp, loff_t *ppos)
-{
- int ret = 0;
-
- ret = proc_dointvec(table, write, buffer, lenp, ppos);
-
- if (write && !ret) {
- int enabled = init_net.ipv4.sysctl_udp_early_demux;
-
- proc_configure_early_demux(enabled, IPPROTO_UDP);
- }
-
- return ret;
-}
-
static int proc_tfo_blackhole_detect_timeout(struct ctl_table *table,
int write,
void __user *buffer,
@@ -701,14 +646,14 @@ static struct ctl_table ipv4_net_table[] = {
.data = &init_net.ipv4.sysctl_udp_early_demux,
.maxlen = sizeof(int),
.mode = 0644,
- .proc_handler = proc_udp_early_demux
+ .proc_handler = proc_douintvec_minmax,
},
{
.procname = "tcp_early_demux",
.data = &init_net.ipv4.sysctl_tcp_early_demux,
.maxlen = sizeof(int),
.mode = 0644,
- .proc_handler = proc_tcp_early_demux
+ .proc_handler = proc_douintvec_minmax,
},
{
.procname = "ip_default_ttl",
diff --git a/net/ipv6/ip6_input.c b/net/ipv6/ip6_input.c
index e6c4966aa956..ebf90bce063a 100644
--- a/net/ipv6/ip6_input.c
+++ b/net/ipv6/ip6_input.c
@@ -44,21 +44,25 @@
#include <net/inet_ecn.h>
#include <net/dst_metadata.h>
-INDIRECT_CALLABLE_DECLARE(void udp_v6_early_demux(struct sk_buff *));
-INDIRECT_CALLABLE_DECLARE(void tcp_v6_early_demux(struct sk_buff *));
+void udp_v6_early_demux(struct sk_buff *);
+void tcp_v6_early_demux(struct sk_buff *);
static void ip6_rcv_finish_core(struct net *net, struct sock *sk,
struct sk_buff *skb)
{
- void (*edemux)(struct sk_buff *skb);
-
- if (net->ipv4.sysctl_ip_early_demux && !skb_dst(skb) && skb->sk == NULL) {
- const struct inet6_protocol *ipprot;
-
- ipprot = rcu_dereference(inet6_protos[ipv6_hdr(skb)->nexthdr]);
- if (ipprot && (edemux = READ_ONCE(ipprot->early_demux)))
- INDIRECT_CALL_2(edemux, tcp_v6_early_demux,
- udp_v6_early_demux, skb);
+ if (READ_ONCE(net->ipv4.sysctl_ip_early_demux) &&
+ !skb_dst(skb) && !skb->sk) {
+ switch (ipv6_hdr(skb)->nexthdr) {
+ case IPPROTO_TCP:
+ if (READ_ONCE(net->ipv4.sysctl_tcp_early_demux))
+ tcp_v6_early_demux(skb);
+ break;
+ case IPPROTO_UDP:
+ if (READ_ONCE(net->ipv4.sysctl_udp_early_demux))
+ udp_v6_early_demux(skb);
+ break;
+ }
}
+
if (!skb_valid_dst(skb))
ip6_route_input(skb);
}
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 397c4597c438..831f779aba7b 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -1729,7 +1729,7 @@ INDIRECT_CALLABLE_SCOPE int tcp_v6_rcv(struct sk_buff *skb)
goto discard_it;
}
-INDIRECT_CALLABLE_SCOPE void tcp_v6_early_demux(struct sk_buff *skb)
+void tcp_v6_early_demux(struct sk_buff *skb)
{
const struct ipv6hdr *hdr;
const struct tcphdr *th;
@@ -2084,12 +2084,7 @@ struct proto tcpv6_prot = {
.diag_destroy = tcp_abort,
};
-/* thinking of making this const? Don't.
- * early_demux can change based on sysctl.
- */
-static struct inet6_protocol tcpv6_protocol = {
- .early_demux = tcp_v6_early_demux,
- .early_demux_handler = tcp_v6_early_demux,
+static const struct inet6_protocol tcpv6_protocol = {
.handler = tcp_v6_rcv,
.err_handler = tcp_v6_err,
.flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 62c0db6df563..fd1ce0405b7e 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -973,7 +973,7 @@ static struct sock *__udp6_lib_demux_lookup(struct net *net,
return NULL;
}
-INDIRECT_CALLABLE_SCOPE void udp_v6_early_demux(struct sk_buff *skb)
+void udp_v6_early_demux(struct sk_buff *skb)
{
struct net *net = dev_net(skb->dev);
const struct udphdr *uh;
@@ -1603,12 +1603,7 @@ int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
}
#endif
-/* thinking of making this const? Don't.
- * early_demux can change based on sysctl.
- */
-static struct inet6_protocol udpv6_protocol = {
- .early_demux = udp_v6_early_demux,
- .early_demux_handler = udp_v6_early_demux,
+static const struct inet6_protocol udpv6_protocol = {
.handler = udpv6_rcv,
.err_handler = udpv6_err,
.flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
--
2.30.2
