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f6c0f5d209
ctl packets sent on behalf of TIME_WAIT sockets currently have a zero skb->priority, which can cause various problems. In this patch we : - add a tw_priority field in struct inet_timewait_sock. - populate it from sk->sk_priority when a TIME_WAIT is created. - For IPv4, change ip_send_unicast_reply() and its two callers to propagate tw_priority correctly. ip_send_unicast_reply() no longer changes sk->sk_priority. - For IPv6, make sure TIME_WAIT sockets pass their tw_priority field to tcp_v6_send_response() and tcp_v6_send_ack(). Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
127 lines
3.6 KiB
C
127 lines
3.6 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 a generic INET TIMEWAIT sock
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*
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* From code originally in net/tcp.h
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*/
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#ifndef _INET_TIMEWAIT_SOCK_
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#define _INET_TIMEWAIT_SOCK_
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#include <linux/list.h>
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#include <linux/timer.h>
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#include <linux/types.h>
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#include <linux/workqueue.h>
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#include <net/inet_sock.h>
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#include <net/sock.h>
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#include <net/tcp_states.h>
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#include <net/timewait_sock.h>
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#include <linux/atomic.h>
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struct inet_bind_bucket;
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/*
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* This is a TIME_WAIT sock. It works around the memory consumption
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* problems of sockets in such a state on heavily loaded servers, but
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* without violating the protocol specification.
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*/
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struct inet_timewait_sock {
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/*
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* Now struct sock also uses sock_common, so please just
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* don't add nothing before this first member (__tw_common) --acme
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*/
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struct sock_common __tw_common;
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#define tw_family __tw_common.skc_family
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#define tw_state __tw_common.skc_state
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#define tw_reuse __tw_common.skc_reuse
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#define tw_reuseport __tw_common.skc_reuseport
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#define tw_ipv6only __tw_common.skc_ipv6only
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#define tw_bound_dev_if __tw_common.skc_bound_dev_if
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#define tw_node __tw_common.skc_nulls_node
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#define tw_bind_node __tw_common.skc_bind_node
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#define tw_refcnt __tw_common.skc_refcnt
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#define tw_hash __tw_common.skc_hash
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#define tw_prot __tw_common.skc_prot
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#define tw_net __tw_common.skc_net
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#define tw_daddr __tw_common.skc_daddr
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#define tw_v6_daddr __tw_common.skc_v6_daddr
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#define tw_rcv_saddr __tw_common.skc_rcv_saddr
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#define tw_v6_rcv_saddr __tw_common.skc_v6_rcv_saddr
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#define tw_dport __tw_common.skc_dport
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#define tw_num __tw_common.skc_num
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#define tw_cookie __tw_common.skc_cookie
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#define tw_dr __tw_common.skc_tw_dr
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__u32 tw_mark;
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volatile unsigned char tw_substate;
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unsigned char tw_rcv_wscale;
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/* Socket demultiplex comparisons on incoming packets. */
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/* these three are in inet_sock */
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__be16 tw_sport;
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/* And these are ours. */
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unsigned int tw_kill : 1,
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tw_transparent : 1,
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tw_flowlabel : 20,
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tw_pad : 2, /* 2 bits hole */
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tw_tos : 8;
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u32 tw_txhash;
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u32 tw_priority;
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struct timer_list tw_timer;
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struct inet_bind_bucket *tw_tb;
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};
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#define tw_tclass tw_tos
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static inline struct inet_timewait_sock *inet_twsk(const struct sock *sk)
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{
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return (struct inet_timewait_sock *)sk;
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}
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void inet_twsk_free(struct inet_timewait_sock *tw);
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void inet_twsk_put(struct inet_timewait_sock *tw);
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void inet_twsk_bind_unhash(struct inet_timewait_sock *tw,
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struct inet_hashinfo *hashinfo);
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struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk,
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struct inet_timewait_death_row *dr,
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const int state);
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void inet_twsk_hashdance(struct inet_timewait_sock *tw, struct sock *sk,
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struct inet_hashinfo *hashinfo);
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void __inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo,
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bool rearm);
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static inline void inet_twsk_schedule(struct inet_timewait_sock *tw, int timeo)
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{
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__inet_twsk_schedule(tw, timeo, false);
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}
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static inline void inet_twsk_reschedule(struct inet_timewait_sock *tw, int timeo)
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{
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__inet_twsk_schedule(tw, timeo, true);
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}
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void inet_twsk_deschedule_put(struct inet_timewait_sock *tw);
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void inet_twsk_purge(struct inet_hashinfo *hashinfo, int family);
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static inline
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struct net *twsk_net(const struct inet_timewait_sock *twsk)
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{
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return read_pnet(&twsk->tw_net);
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}
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static inline
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void twsk_net_set(struct inet_timewait_sock *twsk, struct net *net)
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{
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write_pnet(&twsk->tw_net, net);
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}
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#endif /* _INET_TIMEWAIT_SOCK_ */
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