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net: implement lockless SO_PRIORITY

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This is a followup of 8bf43be799 ("net: annotate data-races
around sk->sk_priority").

sk->sk_priority can be read and written without holding the socket lock.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Wenjia Zhang <wenjia@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2023-09-21 20:28:11 +00:00 committed by David S. Miller
parent 06bc3668cc
commit 10bbf1652c
24 changed files with 36 additions and 35 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/ppp/pppoe.c
View File

@ -877,7 +877,7 @@ static int pppoe_sendmsg(struct socket *sock, struct msghdr *m,
skb->dev = dev;
skb->priority = sk->sk_priority;
skb->priority = READ_ONCE(sk->sk_priority);
skb->protocol = cpu_to_be16(ETH_P_PPP_SES);
ph = skb_put(skb, total_len + sizeof(struct pppoe_hdr));

2
include/net/bluetooth/bluetooth.h
View File

@ -541,7 +541,7 @@ static inline struct sk_buff *bt_skb_sendmsg(struct sock *sk,
return ERR_PTR(-EFAULT);
}
skb->priority = sk->sk_priority;
skb->priority = READ_ONCE(sk->sk_priority);
return skb;
}

2
net/appletalk/aarp.c
View File

@ -664,7 +664,7 @@ int aarp_send_ddp(struct net_device *dev, struct sk_buff *skb,
sendit:
if (skb->sk)
skb->priority = skb->sk->sk_priority;
skb->priority = READ_ONCE(skb->sk->sk_priority);
if (dev_queue_xmit(skb))
goto drop;
sent:

2
net/ax25/af_ax25.c
View File

@ -939,7 +939,7 @@ struct sock *ax25_make_new(struct sock *osk, struct ax25_dev *ax25_dev)
sock_init_data(NULL, sk);
sk->sk_type = osk->sk_type;
sk->sk_priority = osk->sk_priority;
sk->sk_priority = READ_ONCE(osk->sk_priority);
sk->sk_protocol = osk->sk_protocol;
sk->sk_rcvbuf = osk->sk_rcvbuf;
sk->sk_sndbuf = osk->sk_sndbuf;

2
net/bluetooth/l2cap_sock.c
View File

@ -1615,7 +1615,7 @@ static struct sk_buff *l2cap_sock_alloc_skb_cb(struct l2cap_chan *chan,
return ERR_PTR(-ENOTCONN);
}
skb->priority = sk->sk_priority;
skb->priority = READ_ONCE(sk->sk_priority);
bt_cb(skb)->l2cap.chan = chan;

2
net/can/j1939/socket.c
View File

@ -884,7 +884,7 @@ static struct sk_buff *j1939_sk_alloc_skb(struct net_device *ndev,
skcb = j1939_skb_to_cb(skb);
memset(skcb, 0, sizeof(*skcb));
skcb->addr = jsk->addr;
skcb->priority = j1939_prio(sk->sk_priority);
skcb->priority = j1939_prio(READ_ONCE(sk->sk_priority));
if (msg->msg_name) {
struct sockaddr_can *addr = msg->msg_name;

2
net/can/raw.c
View File

@ -881,7 +881,7 @@ static int raw_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
}
skb->dev = dev;
skb->priority = sk->sk_priority;
skb->priority = READ_ONCE(sk->sk_priority);
skb->mark = READ_ONCE(sk->sk_mark);
skb->tstamp = sockc.transmit_time;

23
net/core/sock.c
View File

@ -806,9 +806,7 @@ EXPORT_SYMBOL(sock_no_linger);
void sock_set_priority(struct sock *sk, u32 priority)
{
lock_sock(sk);
WRITE_ONCE(sk->sk_priority, priority);
release_sock(sk);
}
EXPORT_SYMBOL(sock_set_priority);
@ -1118,6 +1116,18 @@ int sk_setsockopt(struct sock *sk, int level, int optname,
valbool = val ? 1 : 0;
/* handle options which do not require locking the socket. */
switch (optname) {
case SO_PRIORITY:
if ((val >= 0 && val <= 6) ||
sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) ||
sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
sock_set_priority(sk, val);
return 0;
}
return -EPERM;
}
sockopt_lock_sock(sk);
switch (optname) {
@ -1213,15 +1223,6 @@ int sk_setsockopt(struct sock *sk, int level, int optname,
sk->sk_no_check_tx = valbool;
break;
case SO_PRIORITY:
if ((val >= 0 && val <= 6) ||
sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) ||
sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
WRITE_ONCE(sk->sk_priority, val);
else
ret = -EPERM;
break;
case SO_LINGER:
if (optlen < sizeof(ling)) {
ret = -EINVAL; /* 1003.1g */

2
net/dccp/ipv6.c
View File

@ -239,7 +239,7 @@ static int dccp_v6_send_response(const struct sock *sk, struct request_sock *req
if (!opt)
opt = rcu_dereference(np->opt);
err = ip6_xmit(sk, skb, &fl6, READ_ONCE(sk->sk_mark), opt,
np->tclass, sk->sk_priority);
np->tclass, READ_ONCE(sk->sk_priority));
rcu_read_unlock();
err = net_xmit_eval(err);
}

2
net/ipv4/inet_diag.c
View File

@ -165,7 +165,7 @@ int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
* For cgroup2 classid is always zero.
*/
if (!classid)
classid = sk->sk_priority;
classid = READ_ONCE(sk->sk_priority);
if (nla_put_u32(skb, INET_DIAG_CLASS_ID, classid))
goto errout;

2
net/ipv4/ip_output.c
View File

@ -1449,7 +1449,7 @@ struct sk_buff *__ip_make_skb(struct sock *sk,
ip_options_build(skb, opt, cork->addr, rt);
}
skb->priority = (cork->tos != -1) ? cork->priority: sk->sk_priority;
skb->priority = (cork->tos != -1) ? cork->priority: READ_ONCE(sk->sk_priority);
skb->mark = cork->mark;
skb->tstamp = cork->transmit_time;
/*

2
net/ipv4/tcp_ipv4.c
View File

@ -828,7 +828,7 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb)
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;
inet_twsk(sk)->tw_priority : READ_ONCE(sk->sk_priority);
transmit_time = tcp_transmit_time(sk);
xfrm_sk_clone_policy(ctl_sk, sk);
txhash = (sk->sk_state == TCP_TIME_WAIT) ?

2
net/ipv4/tcp_minisocks.c
View File

@ -292,7 +292,7 @@ void tcp_time_wait(struct sock *sk, int state, int timeo)
tw->tw_transparent = inet_test_bit(TRANSPARENT, sk);
tw->tw_mark = sk->sk_mark;
tw->tw_priority = sk->sk_priority;
tw->tw_priority = READ_ONCE(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;

2
net/ipv6/inet6_connection_sock.c
View File

@ -133,7 +133,7 @@ int inet6_csk_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl_unused
fl6.daddr = sk->sk_v6_daddr;
res = ip6_xmit(sk, skb, &fl6, sk->sk_mark, rcu_dereference(np->opt),
np->tclass, sk->sk_priority);
np->tclass, READ_ONCE(sk->sk_priority));
rcu_read_unlock();
return res;
}

2
net/ipv6/ip6_output.c
View File

@ -1984,7 +1984,7 @@ struct sk_buff *__ip6_make_skb(struct sock *sk,
hdr->saddr = fl6->saddr;
hdr->daddr = *final_dst;
skb->priority = sk->sk_priority;
skb->priority = READ_ONCE(sk->sk_priority);
skb->mark = cork->base.mark;
skb->tstamp = cork->base.transmit_time;

4
net/ipv6/tcp_ipv6.c
View File

@ -565,7 +565,7 @@ static int tcp_v6_send_synack(const struct sock *sk, struct dst_entry *dst,
if (!opt)
opt = rcu_dereference(np->opt);
err = ip6_xmit(sk, skb, fl6, skb->mark ? : READ_ONCE(sk->sk_mark),
opt, tclass, sk->sk_priority);
opt, tclass, READ_ONCE(sk->sk_priority));
rcu_read_unlock();
err = net_xmit_eval(err);
}
@ -1058,7 +1058,7 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
trace_tcp_send_reset(sk, skb);
if (inet6_test_bit(REPFLOW, sk))
label = ip6_flowlabel(ipv6h);
priority = sk->sk_priority;
priority = READ_ONCE(sk->sk_priority);
txhash = sk->sk_txhash;
}
if (sk->sk_state == TCP_TIME_WAIT) {

2
net/mptcp/sockopt.c
View File

@ -89,7 +89,7 @@ static void mptcp_sol_socket_sync_intval(struct mptcp_sock *msk, int optname, in
sock_valbool_flag(ssk, SOCK_KEEPOPEN, !!val);
break;
case SO_PRIORITY:
ssk->sk_priority = val;
WRITE_ONCE(ssk->sk_priority, val);
break;
case SO_SNDBUF:
case SO_SNDBUFFORCE:

2
net/netrom/af_netrom.c
View File

@ -487,7 +487,7 @@ static struct sock *nr_make_new(struct sock *osk)
sock_init_data(NULL, sk);
sk->sk_type = osk->sk_type;
sk->sk_priority = osk->sk_priority;
sk->sk_priority = READ_ONCE(osk->sk_priority);
sk->sk_protocol = osk->sk_protocol;
sk->sk_rcvbuf = osk->sk_rcvbuf;
sk->sk_sndbuf = osk->sk_sndbuf;

2
net/rose/af_rose.c
View File

@ -583,7 +583,7 @@ static struct sock *rose_make_new(struct sock *osk)
#endif
sk->sk_type = osk->sk_type;
sk->sk_priority = osk->sk_priority;
sk->sk_priority = READ_ONCE(osk->sk_priority);
sk->sk_protocol = osk->sk_protocol;
sk->sk_rcvbuf = osk->sk_rcvbuf;
sk->sk_sndbuf = osk->sk_sndbuf;

2
net/sched/em_meta.c
View File

@ -546,7 +546,7 @@ META_COLLECTOR(int_sk_prio)
*err = -1;
return;
}
dst->value = sk->sk_priority;
dst->value = READ_ONCE(sk->sk_priority);
}
META_COLLECTOR(int_sk_rcvlowat)

2
net/sctp/ipv6.c
View File

@ -247,7 +247,7 @@ static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *t)
rcu_read_lock();
res = ip6_xmit(sk, skb, fl6, sk->sk_mark,
rcu_dereference(np->opt),
tclass, sk->sk_priority);
tclass, READ_ONCE(sk->sk_priority));
rcu_read_unlock();
return res;
}

2
net/smc/af_smc.c
View File

@ -493,7 +493,7 @@ static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk,
nsk->sk_sndtimeo = osk->sk_sndtimeo;
nsk->sk_rcvtimeo = osk->sk_rcvtimeo;
nsk->sk_mark = READ_ONCE(osk->sk_mark);
nsk->sk_priority = osk->sk_priority;
nsk->sk_priority = READ_ONCE(osk->sk_priority);
nsk->sk_rcvlowat = osk->sk_rcvlowat;
nsk->sk_bound_dev_if = osk->sk_bound_dev_if;
nsk->sk_err = osk->sk_err;

2
net/x25/af_x25.c
View File

@ -598,7 +598,7 @@ static struct sock *x25_make_new(struct sock *osk)
x25 = x25_sk(sk);
sk->sk_type = osk->sk_type;
sk->sk_priority = osk->sk_priority;
sk->sk_priority = READ_ONCE(osk->sk_priority);
sk->sk_protocol = osk->sk_protocol;
sk->sk_rcvbuf = osk->sk_rcvbuf;
sk->sk_sndbuf = osk->sk_sndbuf;

2
net/xdp/xsk.c
View File

@ -684,7 +684,7 @@ static struct sk_buff *xsk_build_skb(struct xdp_sock *xs,
}
skb->dev = dev;
skb->priority = xs->sk.sk_priority;
skb->priority = READ_ONCE(xs->sk.sk_priority);
skb->mark = READ_ONCE(xs->sk.sk_mark);
skb->destructor = xsk_destruct_skb;
xsk_set_destructor_arg(skb);