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Commite21145a987("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 commitdddb64bcb3("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:dddb64bcb3("net: Add sysctl to toggle early demux for tcp and udp") Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com> Link: https://lore.kernel.org/r/20220713175207.7727-1-kuniyu@amazon.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
117 lines
3.8 KiB
C
117 lines
3.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* Definitions for the protocol dispatcher.
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*
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* Version: @(#)protocol.h 1.0.2 05/07/93
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*
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* Author: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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*
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* Changes:
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* Alan Cox : Added a name field and a frag handler
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* field for later.
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* Alan Cox : Cleaned up, and sorted types.
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* Pedro Roque : inet6 protocols
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*/
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#ifndef _PROTOCOL_H
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#define _PROTOCOL_H
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#include <linux/in6.h>
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#include <linux/skbuff.h>
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#if IS_ENABLED(CONFIG_IPV6)
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#include <linux/ipv6.h>
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#endif
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#include <linux/netdevice.h>
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/* This is one larger than the largest protocol value that can be
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* found in an ipv4 or ipv6 header. Since in both cases the protocol
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* value is presented in a __u8, this is defined to be 256.
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*/
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#define MAX_INET_PROTOS 256
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/* This is used to register protocols. */
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struct net_protocol {
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int (*handler)(struct sk_buff *skb);
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/* This returns an error if we weren't able to handle the error. */
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int (*err_handler)(struct sk_buff *skb, u32 info);
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unsigned int no_policy:1,
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/* does the protocol do more stringent
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* icmp tag validation than simple
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* socket lookup?
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*/
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icmp_strict_tag_validation:1;
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};
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#if IS_ENABLED(CONFIG_IPV6)
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struct inet6_protocol {
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int (*handler)(struct sk_buff *skb);
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/* This returns an error if we weren't able to handle the error. */
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int (*err_handler)(struct sk_buff *skb,
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struct inet6_skb_parm *opt,
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u8 type, u8 code, int offset,
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__be32 info);
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unsigned int flags; /* INET6_PROTO_xxx */
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};
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#define INET6_PROTO_NOPOLICY 0x1
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#define INET6_PROTO_FINAL 0x2
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#endif
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struct net_offload {
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struct offload_callbacks callbacks;
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unsigned int flags; /* Flags used by IPv6 for now */
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};
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/* This should be set for any extension header which is compatible with GSO. */
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#define INET6_PROTO_GSO_EXTHDR 0x1
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/* This is used to register socket interfaces for IP protocols. */
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struct inet_protosw {
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struct list_head list;
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/* These two fields form the lookup key. */
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unsigned short type; /* This is the 2nd argument to socket(2). */
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unsigned short protocol; /* This is the L4 protocol number. */
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struct proto *prot;
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const struct proto_ops *ops;
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unsigned char flags; /* See INET_PROTOSW_* below. */
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};
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#define INET_PROTOSW_REUSE 0x01 /* Are ports automatically reusable? */
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#define INET_PROTOSW_PERMANENT 0x02 /* Permanent protocols are unremovable. */
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#define INET_PROTOSW_ICSK 0x04 /* Is this an inet_connection_sock? */
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extern struct net_protocol __rcu *inet_protos[MAX_INET_PROTOS];
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extern const struct net_offload __rcu *inet_offloads[MAX_INET_PROTOS];
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extern const struct net_offload __rcu *inet6_offloads[MAX_INET_PROTOS];
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#if IS_ENABLED(CONFIG_IPV6)
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extern struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS];
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#endif
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int inet_add_protocol(const struct net_protocol *prot, unsigned char num);
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int inet_del_protocol(const struct net_protocol *prot, unsigned char num);
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int inet_add_offload(const struct net_offload *prot, unsigned char num);
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int inet_del_offload(const struct net_offload *prot, unsigned char num);
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void inet_register_protosw(struct inet_protosw *p);
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void inet_unregister_protosw(struct inet_protosw *p);
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#if IS_ENABLED(CONFIG_IPV6)
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int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char num);
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int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char num);
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int inet6_register_protosw(struct inet_protosw *p);
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void inet6_unregister_protosw(struct inet_protosw *p);
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#endif
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int inet6_add_offload(const struct net_offload *prot, unsigned char num);
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int inet6_del_offload(const struct net_offload *prot, unsigned char num);
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#endif /* _PROTOCOL_H */
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