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Date: Wed, 23 Jan 2019 13:47:30 +0100
From: Simon Horman <horms@...ge.net.au>
To: Julian Anastasov <ja@....bg>,
Pablo Neira Ayuso <pablo@...filter.org>
Cc: Matteo Croce <mcroce@...hat.com>, lvs-devel@...r.kernel.org,
netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
coreteam@...filter.org, Wensong Zhang <wensong@...ux-vs.org>,
Paolo Abeni <pabeni@...hat.com>
Subject: Re: [PATCH ipvs-next] ipvs: use indirect call wrappers
On Sun, Jan 20, 2019 at 02:12:04PM +0200, Julian Anastasov wrote:
>
> Hello,
>
> On Sat, 19 Jan 2019, Matteo Croce wrote:
>
> > Use the new indirect call wrappers in IPVS when calling the TCP or UDP
> > protocol specific functions.
> > This avoids an indirect calls in IPVS, and reduces the performance
> > impact of the Spectre mitigation.
> >
> > Signed-off-by: Matteo Croce <mcroce@...hat.com>
>
> Looks good to me, thanks!
>
> Acked-by: Julian Anastasov <ja@....bg>
Likewise, Pablo could you consider applying this to nf-next?
Acked-by: Simon Horman <horms@...ge.net.au>
>
> > ---
> > net/netfilter/ipvs/ip_vs_core.c | 49 +++++++++++++++++++++++-----
> > net/netfilter/ipvs/ip_vs_proto_tcp.c | 3 +-
> > net/netfilter/ipvs/ip_vs_proto_udp.c | 3 +-
> > 3 files changed, 45 insertions(+), 10 deletions(-)
> >
> > diff --git a/net/netfilter/ipvs/ip_vs_core.c b/net/netfilter/ipvs/ip_vs_core.c
> > index fe9abf3cc10a..e969dad66991 100644
> > --- a/net/netfilter/ipvs/ip_vs_core.c
> > +++ b/net/netfilter/ipvs/ip_vs_core.c
> > @@ -53,6 +53,7 @@
> > #endif
> >
> > #include <net/ip_vs.h>
> > +#include <linux/indirect_call_wrapper.h>
> >
> >
> > EXPORT_SYMBOL(register_ip_vs_scheduler);
> > @@ -70,6 +71,29 @@ EXPORT_SYMBOL(ip_vs_get_debug_level);
> > #endif
> > EXPORT_SYMBOL(ip_vs_new_conn_out);
> >
> > +#ifdef CONFIG_IP_VS_PROTO_TCP
> > +INDIRECT_CALLABLE_DECLARE(int
> > + tcp_snat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp,
> > + struct ip_vs_conn *cp, struct ip_vs_iphdr *iph));
> > +#endif
> > +
> > +#ifdef CONFIG_IP_VS_PROTO_UDP
> > +INDIRECT_CALLABLE_DECLARE(int
> > + udp_snat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp,
> > + struct ip_vs_conn *cp, struct ip_vs_iphdr *iph));
> > +#endif
> > +
> > +#if defined(CONFIG_IP_VS_PROTO_TCP) && defined(CONFIG_IP_VS_PROTO_UDP)
> > +#define SNAT_CALL(f, ...) \
> > + INDIRECT_CALL_2(f, tcp_snat_handler, udp_snat_handler, __VA_ARGS__)
> > +#elif defined(CONFIG_IP_VS_PROTO_TCP)
> > +#define SNAT_CALL(f, ...) INDIRECT_CALL_1(f, tcp_snat_handler, __VA_ARGS__)
> > +#elif defined(CONFIG_IP_VS_PROTO_UDP)
> > +#define SNAT_CALL(f, ...) INDIRECT_CALL_1(f, udp_snat_handler, __VA_ARGS__)
> > +#else
> > +#define SNAT_CALL(f, ...) f(__VA_ARGS__)
> > +#endif
> > +
> > static unsigned int ip_vs_net_id __read_mostly;
> > /* netns cnt used for uniqueness */
> > static atomic_t ipvs_netns_cnt = ATOMIC_INIT(0);
> > @@ -478,7 +502,9 @@ ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
> > */
> > if ((!skb->dev || skb->dev->flags & IFF_LOOPBACK)) {
> > iph->hdr_flags ^= IP_VS_HDR_INVERSE;
> > - cp = pp->conn_in_get(svc->ipvs, svc->af, skb, iph);
> > + cp = INDIRECT_CALL_1(pp->conn_in_get,
> > + ip_vs_conn_in_get_proto, svc->ipvs,
> > + svc->af, skb, iph);
> > iph->hdr_flags ^= IP_VS_HDR_INVERSE;
> >
> > if (cp) {
> > @@ -972,7 +998,8 @@ static int ip_vs_out_icmp(struct netns_ipvs *ipvs, struct sk_buff *skb,
> > ip_vs_fill_iph_skb_icmp(AF_INET, skb, offset, true, &ciph);
> >
> > /* The embedded headers contain source and dest in reverse order */
> > - cp = pp->conn_out_get(ipvs, AF_INET, skb, &ciph);
> > + cp = INDIRECT_CALL_1(pp->conn_out_get, ip_vs_conn_out_get_proto,
> > + ipvs, AF_INET, skb, &ciph);
> > if (!cp)
> > return NF_ACCEPT;
> >
> > @@ -1028,7 +1055,8 @@ static int ip_vs_out_icmp_v6(struct netns_ipvs *ipvs, struct sk_buff *skb,
> > return NF_ACCEPT;
> >
> > /* The embedded headers contain source and dest in reverse order */
> > - cp = pp->conn_out_get(ipvs, AF_INET6, skb, &ciph);
> > + cp = INDIRECT_CALL_1(pp->conn_out_get, ip_vs_conn_out_get_proto,
> > + ipvs, AF_INET6, skb, &ciph);
> > if (!cp)
> > return NF_ACCEPT;
> >
> > @@ -1263,7 +1291,8 @@ handle_response(int af, struct sk_buff *skb, struct ip_vs_proto_data *pd,
> > goto drop;
> >
> > /* mangle the packet */
> > - if (pp->snat_handler && !pp->snat_handler(skb, pp, cp, iph))
> > + if (pp->snat_handler &&
> > + !SNAT_CALL(pp->snat_handler, skb, pp, cp, iph))
> > goto drop;
> >
> > #ifdef CONFIG_IP_VS_IPV6
> > @@ -1389,7 +1418,8 @@ ip_vs_out(struct netns_ipvs *ipvs, unsigned int hooknum, struct sk_buff *skb, in
> > /*
> > * Check if the packet belongs to an existing entry
> > */
> > - cp = pp->conn_out_get(ipvs, af, skb, &iph);
> > + cp = INDIRECT_CALL_1(pp->conn_out_get, ip_vs_conn_out_get_proto,
> > + ipvs, af, skb, &iph);
> >
> > if (likely(cp)) {
> > if (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ)
> > @@ -1644,7 +1674,8 @@ ip_vs_in_icmp(struct netns_ipvs *ipvs, struct sk_buff *skb, int *related,
> > /* The embedded headers contain source and dest in reverse order.
> > * For IPIP this is error for request, not for reply.
> > */
> > - cp = pp->conn_in_get(ipvs, AF_INET, skb, &ciph);
> > + cp = INDIRECT_CALL_1(pp->conn_in_get, ip_vs_conn_in_get_proto,
> > + ipvs, AF_INET, skb, &ciph);
> >
> > if (!cp) {
> > int v;
> > @@ -1796,7 +1827,8 @@ static int ip_vs_in_icmp_v6(struct netns_ipvs *ipvs, struct sk_buff *skb,
> > /* The embedded headers contain source and dest in reverse order
> > * if not from localhost
> > */
> > - cp = pp->conn_in_get(ipvs, AF_INET6, skb, &ciph);
> > + cp = INDIRECT_CALL_1(pp->conn_in_get, ip_vs_conn_in_get_proto,
> > + ipvs, AF_INET6, skb, &ciph);
> >
> > if (!cp) {
> > int v;
> > @@ -1925,7 +1957,8 @@ ip_vs_in(struct netns_ipvs *ipvs, unsigned int hooknum, struct sk_buff *skb, int
> > /*
> > * Check if the packet belongs to an existing connection entry
> > */
> > - cp = pp->conn_in_get(ipvs, af, skb, &iph);
> > + cp = INDIRECT_CALL_1(pp->conn_in_get, ip_vs_conn_in_get_proto,
> > + ipvs, af, skb, &iph);
> >
> > conn_reuse_mode = sysctl_conn_reuse_mode(ipvs);
> > if (conn_reuse_mode && !iph.fragoffs && is_new_conn(skb, &iph) && cp) {
> > diff --git a/net/netfilter/ipvs/ip_vs_proto_tcp.c b/net/netfilter/ipvs/ip_vs_proto_tcp.c
> > index 6a275f989085..479419759983 100644
> > --- a/net/netfilter/ipvs/ip_vs_proto_tcp.c
> > +++ b/net/netfilter/ipvs/ip_vs_proto_tcp.c
> > @@ -28,6 +28,7 @@
> > #include <net/ip6_checksum.h>
> > #include <linux/netfilter.h>
> > #include <linux/netfilter_ipv4.h>
> > +#include <linux/indirect_call_wrapper.h>
> >
> > #include <net/ip_vs.h>
> >
> > @@ -146,7 +147,7 @@ tcp_partial_csum_update(int af, struct tcphdr *tcph,
> > }
> >
> >
> > -static int
> > +INDIRECT_CALLABLE_SCOPE int
> > tcp_snat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp,
> > struct ip_vs_conn *cp, struct ip_vs_iphdr *iph)
> > {
> > diff --git a/net/netfilter/ipvs/ip_vs_proto_udp.c b/net/netfilter/ipvs/ip_vs_proto_udp.c
> > index 3285718264d5..646c384910fb 100644
> > --- a/net/netfilter/ipvs/ip_vs_proto_udp.c
> > +++ b/net/netfilter/ipvs/ip_vs_proto_udp.c
> > @@ -23,6 +23,7 @@
> > #include <linux/netfilter.h>
> > #include <linux/netfilter_ipv4.h>
> > #include <linux/udp.h>
> > +#include <linux/indirect_call_wrapper.h>
> >
> > #include <net/ip_vs.h>
> > #include <net/ip.h>
> > @@ -136,7 +137,7 @@ udp_partial_csum_update(int af, struct udphdr *uhdr,
> > }
> >
> >
> > -static int
> > +INDIRECT_CALLABLE_SCOPE int
> > udp_snat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp,
> > struct ip_vs_conn *cp, struct ip_vs_iphdr *iph)
> > {
> > --
> > 2.20.1
>
> Regards
>
> --
> Julian Anastasov <ja@....bg>
>
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