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ipv6: move np->repflow to atomic flags 

Move np->repflow to inet->inet_flags to fix data-races.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2023-09-12 16:02:09 +00:00 committed by David S. Miller
parent 3fa29971c6
commit 3cccda8db2
6 changed files with 14 additions and 15 deletions
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1
include/linux/ipv6.h
View File

@ -244,7 +244,6 @@ struct ipv6_pinfo {
/* sockopt flags */
__u16 sndflow:1,
repflow:1,
pmtudisc:3,
padding:1, /* 1 bit hole */
srcprefs:3, /* 001: prefer temporary address

1
include/net/inet_sock.h
View File

@ -275,6 +275,7 @@ enum {
INET_FLAGS_AUTOFLOWLABEL = 24,
INET_FLAGS_DONTFRAG = 25,
INET_FLAGS_RECVERR6 = 26,
INET_FLAGS_REPFLOW = 27,
};
/* cmsg flags for inet */

2
net/dccp/ipv6.c
View File

@ -679,7 +679,7 @@ ipv6_pktoptions:
WRITE_ONCE(np->mcast_hops, ipv6_hdr(opt_skb)->hop_limit);
if (np->rxopt.bits.rxflow || np->rxopt.bits.rxtclass)
np->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(opt_skb));
if (np->repflow)
if (inet6_test_bit(REPFLOW, sk))
np->flow_label = ip6_flowlabel(ipv6_hdr(opt_skb));
if (ipv6_opt_accepted(sk, opt_skb,
&DCCP_SKB_CB(opt_skb)->header.h6)) {

3
net/ipv6/af_inet6.c
View File

@ -220,7 +220,8 @@ lookup_protocol:
inet6_set_bit(MC6_LOOP, sk);
inet6_set_bit(MC6_ALL, sk);
np->pmtudisc = IPV6_PMTUDISC_WANT;
np->repflow = net->ipv6.sysctl.flowlabel_reflect & FLOWLABEL_REFLECT_ESTABLISHED;
inet6_assign_bit(REPFLOW, sk, net->ipv6.sysctl.flowlabel_reflect &
FLOWLABEL_REFLECT_ESTABLISHED);
sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
sk->sk_txrehash = READ_ONCE(net->core.sysctl_txrehash);

8
net/ipv6/ip6_flowlabel.c
View File

@ -513,7 +513,7 @@ int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
return 0;
}
if (np->repflow) {
if (inet6_test_bit(REPFLOW, sk)) {
freq->flr_label = np->flow_label;
return 0;
}
@ -551,10 +551,10 @@ static int ipv6_flowlabel_put(struct sock *sk, struct in6_flowlabel_req *freq)
if (freq->flr_flags & IPV6_FL_F_REFLECT) {
if (sk->sk_protocol != IPPROTO_TCP)
return -ENOPROTOOPT;
if (!np->repflow)
if (!inet6_test_bit(REPFLOW, sk))
return -ESRCH;
np->flow_label = 0;
np->repflow = 0;
inet6_clear_bit(REPFLOW, sk);
return 0;
}
@ -626,7 +626,7 @@ static int ipv6_flowlabel_get(struct sock *sk, struct in6_flowlabel_req *freq,
if (sk->sk_protocol != IPPROTO_TCP)
return -ENOPROTOOPT;
np->repflow = 1;
inet6_set_bit(REPFLOW, sk);
return 0;
}

14
net/ipv6/tcp_ipv6.c
View File

@ -548,7 +548,7 @@ static int tcp_v6_send_synack(const struct sock *sk, struct dst_entry *dst,
&ireq->ir_v6_rmt_addr);
fl6->daddr = ireq->ir_v6_rmt_addr;
if (np->repflow && ireq->pktopts)
if (inet6_test_bit(REPFLOW, sk) && ireq->pktopts)
fl6->flowlabel = ip6_flowlabel(ipv6_hdr(ireq->pktopts));
tclass = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_reflect_tos) ?
@ -797,7 +797,7 @@ static void tcp_v6_init_req(struct request_sock *req,
(ipv6_opt_accepted(sk_listener, skb, &TCP_SKB_CB(skb)->header.h6) ||
np->rxopt.bits.rxinfo ||
np->rxopt.bits.rxoinfo || np->rxopt.bits.rxhlim ||
np->rxopt.bits.rxohlim || np->repflow)) {
np->rxopt.bits.rxohlim || inet6_test_bit(REPFLOW, sk_listener))) {
refcount_inc(&skb->users);
ireq->pktopts = skb;
}
@ -1055,10 +1055,8 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
if (sk) {
oif = sk->sk_bound_dev_if;
if (sk_fullsock(sk)) {
const struct ipv6_pinfo *np = tcp_inet6_sk(sk);
trace_tcp_send_reset(sk, skb);
if (np->repflow)
if (inet6_test_bit(REPFLOW, sk))
label = ip6_flowlabel(ipv6h);
priority = sk->sk_priority;
txhash = sk->sk_txhash;
@ -1247,7 +1245,7 @@ static struct sock *tcp_v6_syn_recv_sock(const struct sock *sk, struct sk_buff *
newnp->mcast_oif = inet_iif(skb);
newnp->mcast_hops = ip_hdr(skb)->ttl;
newnp->rcv_flowinfo = 0;
if (np->repflow)
if (inet6_test_bit(REPFLOW, sk))
newnp->flow_label = 0;
/*
@ -1320,7 +1318,7 @@ static struct sock *tcp_v6_syn_recv_sock(const struct sock *sk, struct sk_buff *
newnp->mcast_oif = tcp_v6_iif(skb);
newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb));
if (np->repflow)
if (inet6_test_bit(REPFLOW, sk))
newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb));
/* Set ToS of the new socket based upon the value of incoming SYN.
@ -1546,7 +1544,7 @@ ipv6_pktoptions:
ipv6_hdr(opt_skb)->hop_limit);
if (np->rxopt.bits.rxflow || np->rxopt.bits.rxtclass)
np->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(opt_skb));
if (np->repflow)
if (inet6_test_bit(REPFLOW, sk))
np->flow_label = ip6_flowlabel(ipv6_hdr(opt_skb));
if (ipv6_opt_accepted(sk, opt_skb, &TCP_SKB_CB(opt_skb)->header.h6)) {
tcp_v6_restore_cb(opt_skb);