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ipv6: lockless IPV6_AUTOFLOWLABEL implementation 

Move np->autoflowlabel and np->autoflowlabel_set in 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 16:02:06 +00:00 committed by David S. Miller
parent 6559c0ff3b
commit 5121516b0c
5 changed files with 13 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/linux/ipv6.h
View File

@ -253,8 +253,6 @@ struct ipv6_pinfo {
* 100: prefer care-of address
*/
dontfrag:1,
autoflowlabel:1,
autoflowlabel_set:1,
rtalert_isolate:1;
__u8 min_hopcount;
__u8 tclass;

2
include/net/inet_sock.h
View File

@ -271,6 +271,8 @@ enum {
INET_FLAGS_MC6_LOOP = 20,
INET_FLAGS_RECVERR6_RFC4884 = 21,
INET_FLAGS_MC6_ALL = 22,
INET_FLAGS_AUTOFLOWLABEL_SET = 23,
INET_FLAGS_AUTOFLOWLABEL = 24,
};
/* cmsg flags for inet */

2
include/net/ipv6.h
View File

@ -428,7 +428,7 @@ int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
int flags);
int ip6_flowlabel_init(void);
void ip6_flowlabel_cleanup(void);
bool ip6_autoflowlabel(struct net *net, const struct ipv6_pinfo *np);
bool ip6_autoflowlabel(struct net *net, const struct sock *sk);
static inline void fl6_sock_release(struct ip6_flowlabel *fl)
{

12
net/ipv6/ip6_output.c
View File

@ -232,12 +232,11 @@ int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb)
}
EXPORT_SYMBOL(ip6_output);
bool ip6_autoflowlabel(struct net *net, const struct ipv6_pinfo *np)
bool ip6_autoflowlabel(struct net *net, const struct sock *sk)
{
if (!np->autoflowlabel_set)
if (!inet6_test_bit(AUTOFLOWLABEL_SET, sk))
return ip6_default_np_autolabel(net);
else
return np->autoflowlabel;
return inet6_test_bit(AUTOFLOWLABEL, sk);
}
/*
@ -314,7 +313,7 @@ int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
hlimit = ip6_dst_hoplimit(dst);
ip6_flow_hdr(hdr, tclass, ip6_make_flowlabel(net, skb, fl6->flowlabel,
ip6_autoflowlabel(net, np), fl6));
ip6_autoflowlabel(net, sk), fl6));
hdr->payload_len = htons(seg_len);
hdr->nexthdr = proto;
@ -1938,7 +1937,6 @@ struct sk_buff *__ip6_make_skb(struct sock *sk,
struct sk_buff *skb, *tmp_skb;
struct sk_buff **tail_skb;
struct in6_addr *final_dst;
struct ipv6_pinfo *np = inet6_sk(sk);
struct net *net = sock_net(sk);
struct ipv6hdr *hdr;
struct ipv6_txoptions *opt = v6_cork->opt;
@ -1981,7 +1979,7 @@ struct sk_buff *__ip6_make_skb(struct sock *sk,
ip6_flow_hdr(hdr, v6_cork->tclass,
ip6_make_flowlabel(net, skb, fl6->flowlabel,
ip6_autoflowlabel(net, np), fl6));
ip6_autoflowlabel(net, sk), fl6));
hdr->hop_limit = v6_cork->hop_limit;
hdr->nexthdr = proto;
hdr->saddr = fl6->saddr;

11
net/ipv6/ipv6_sockglue.c
View File

@ -474,6 +474,10 @@ int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
return -EINVAL;
inet6_assign_bit(MC6_ALL, sk, valbool);
return 0;
case IPV6_AUTOFLOWLABEL:
inet6_assign_bit(AUTOFLOWLABEL, sk, valbool);
inet6_set_bit(AUTOFLOWLABEL_SET, sk);
return 0;
}
if (needs_rtnl)
rtnl_lock();
@ -970,11 +974,6 @@ done:
np->dontfrag = valbool;
retv = 0;
break;
case IPV6_AUTOFLOWLABEL:
np->autoflowlabel = valbool;
np->autoflowlabel_set = 1;
retv = 0;
break;
case IPV6_RECVFRAGSIZE:
np->rxopt.bits.recvfragsize = valbool;
retv = 0;
@ -1447,7 +1446,7 @@ int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
break;
case IPV6_AUTOFLOWLABEL:
val = ip6_autoflowlabel(sock_net(sk), np);
val = ip6_autoflowlabel(sock_net(sk), sk);
break;
case IPV6_RECVFRAGSIZE: