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tcp: honor SO_PRIORITY in TIME_WAIT state

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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>
This commit is contained in:
Eric Dumazet 2019-09-24 08:01:16 -07:00 committed by David S. Miller
parent e9a5dceee5
commit f6c0f5d209
5 changed files with 10 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/net/inet_timewait_sock.h
View File

@ -71,6 +71,7 @@ struct inet_timewait_sock {
tw_pad : 2, /* 2 bits hole */
tw_tos : 8;
u32 tw_txhash;
u32 tw_priority;
struct timer_list tw_timer;
struct inet_bind_bucket *tw_tb;
};

1
net/ipv4/ip_output.c
View File

@ -1694,7 +1694,6 @@ void ip_send_unicast_reply(struct sock *sk, struct sk_buff *skb,
inet_sk(sk)->tos = arg->tos;
sk->sk_priority = skb->priority;
sk->sk_protocol = ip_hdr(skb)->protocol;
sk->sk_bound_dev_if = arg->bound_dev_if;
sk->sk_sndbuf = sysctl_wmem_default;

4
net/ipv4/tcp_ipv4.c
View File

@ -771,6 +771,8 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb)
if (sk) {
ctl_sk->sk_mark = (sk->sk_state == TCP_TIME_WAIT) ?
inet_twsk(sk)->tw_mark : sk->sk_mark;
ctl_sk->sk_priority = (sk->sk_state == TCP_TIME_WAIT) ?
inet_twsk(sk)->tw_priority : sk->sk_priority;
transmit_time = tcp_transmit_time(sk);
}
ip_send_unicast_reply(ctl_sk,
@ -866,6 +868,8 @@ static void tcp_v4_send_ack(const struct sock *sk,
ctl_sk = this_cpu_read(*net->ipv4.tcp_sk);
ctl_sk->sk_mark = (sk->sk_state == TCP_TIME_WAIT) ?
inet_twsk(sk)->tw_mark : sk->sk_mark;
ctl_sk->sk_priority = (sk->sk_state == TCP_TIME_WAIT) ?
inet_twsk(sk)->tw_priority : sk->sk_priority;
transmit_time = tcp_transmit_time(sk);
ip_send_unicast_reply(ctl_sk,
skb, &TCP_SKB_CB(skb)->header.h4.opt,

1
net/ipv4/tcp_minisocks.c
View File

@ -266,6 +266,7 @@ void tcp_time_wait(struct sock *sk, int state, int timeo)
tw->tw_transparent = inet->transparent;
tw->tw_mark = sk->sk_mark;
tw->tw_priority = sk->sk_priority;
tw->tw_rcv_wscale = tp->rx_opt.rcv_wscale;
tcptw->tw_rcv_nxt = tp->rcv_nxt;
tcptw->tw_snd_nxt = tp->snd_nxt;

6
net/ipv6/tcp_ipv6.c
View File

@ -995,8 +995,10 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
label = ip6_flowlabel(ipv6h);
priority = sk->sk_priority;
}
if (sk->sk_state == TCP_TIME_WAIT)
if (sk->sk_state == TCP_TIME_WAIT) {
label = cpu_to_be32(inet_twsk(sk)->tw_flowlabel);
priority = inet_twsk(sk)->tw_priority;
}
} else {
if (net->ipv6.sysctl.flowlabel_reflect & FLOWLABEL_REFLECT_TCP_RESET)
label = ip6_flowlabel(ipv6h);
@ -1029,7 +1031,7 @@ static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb)
tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale,
tcp_time_stamp_raw() + tcptw->tw_ts_offset,
tcptw->tw_ts_recent, tw->tw_bound_dev_if, tcp_twsk_md5_key(tcptw),
tw->tw_tclass, cpu_to_be32(tw->tw_flowlabel), 0);
tw->tw_tclass, cpu_to_be32(tw->tw_flowlabel), tw->tw_priority);
inet_twsk_put(tw);
}