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Date: Sat, 12 Aug 2023 09:33:31 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>
Cc: Simon Horman <simon.horman@...igine.com>, Soheil Hassas Yeganeh <soheil@...gle.com>, netdev@...r.kernel.org,
eric.dumazet@...il.com, Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH v3 net-next 02/15] inet: set/get simple options locklessly
Now we have inet->inet_flags, we can set following options
without having to hold the socket lock:
IP_PKTINFO, IP_RECVTTL, IP_RECVTOS, IP_RECVOPTS, IP_RETOPTS,
IP_PASSSEC, IP_RECVORIGDSTADDR, IP_RECVFRAGSIZE.
ip_sock_set_pktinfo() no longer hold the socket lock.
Similarly we can get the following options whithout holding
the socket lock:
IP_PKTINFO, IP_RECVTTL, IP_RECVTOS, IP_RECVOPTS, IP_RETOPTS,
IP_PASSSEC, IP_RECVORIGDSTADDR, IP_CHECKSUM, IP_RECVFRAGSIZE.
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Acked-by: Soheil Hassas Yeganeh <soheil@...gle.com>
---
net/ipv4/ip_sockglue.c | 118 ++++++++++++++++++++++-------------------
1 file changed, 62 insertions(+), 56 deletions(-)
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 66f55f3db5ec88e1c771847444eba1d554aca8dc..69b87518348aa5697edc6d88679384f00681f539 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -636,9 +636,7 @@ EXPORT_SYMBOL(ip_sock_set_mtu_discover);
void ip_sock_set_pktinfo(struct sock *sk)
{
- lock_sock(sk);
inet_set_bit(PKTINFO, sk);
- release_sock(sk);
}
EXPORT_SYMBOL(ip_sock_set_pktinfo);
@@ -952,6 +950,36 @@ int do_ip_setsockopt(struct sock *sk, int level, int optname,
if (ip_mroute_opt(optname))
return ip_mroute_setsockopt(sk, optname, optval, optlen);
+ /* Handle options that can be set without locking the socket. */
+ switch (optname) {
+ case IP_PKTINFO:
+ inet_assign_bit(PKTINFO, sk, val);
+ return 0;
+ case IP_RECVTTL:
+ inet_assign_bit(TTL, sk, val);
+ return 0;
+ case IP_RECVTOS:
+ inet_assign_bit(TOS, sk, val);
+ return 0;
+ case IP_RECVOPTS:
+ inet_assign_bit(RECVOPTS, sk, val);
+ return 0;
+ case IP_RETOPTS:
+ inet_assign_bit(RETOPTS, sk, val);
+ return 0;
+ case IP_PASSSEC:
+ inet_assign_bit(PASSSEC, sk, val);
+ return 0;
+ case IP_RECVORIGDSTADDR:
+ inet_assign_bit(ORIGDSTADDR, sk, val);
+ return 0;
+ case IP_RECVFRAGSIZE:
+ if (sk->sk_type != SOCK_RAW && sk->sk_type != SOCK_DGRAM)
+ return -EINVAL;
+ inet_assign_bit(RECVFRAGSIZE, sk, val);
+ return 0;
+ }
+
err = 0;
if (needs_rtnl)
rtnl_lock();
@@ -991,27 +1019,6 @@ int do_ip_setsockopt(struct sock *sk, int level, int optname,
kfree_rcu(old, rcu);
break;
}
- case IP_PKTINFO:
- inet_assign_bit(PKTINFO, sk, val);
- break;
- case IP_RECVTTL:
- inet_assign_bit(TTL, sk, val);
- break;
- case IP_RECVTOS:
- inet_assign_bit(TOS, sk, val);
- break;
- case IP_RECVOPTS:
- inet_assign_bit(RECVOPTS, sk, val);
- break;
- case IP_RETOPTS:
- inet_assign_bit(RETOPTS, sk, val);
- break;
- case IP_PASSSEC:
- inet_assign_bit(PASSSEC, sk, val);
- break;
- case IP_RECVORIGDSTADDR:
- inet_assign_bit(ORIGDSTADDR, sk, val);
- break;
case IP_CHECKSUM:
if (val) {
if (!(inet_test_bit(CHECKSUM, sk))) {
@@ -1025,11 +1032,6 @@ int do_ip_setsockopt(struct sock *sk, int level, int optname,
}
}
break;
- case IP_RECVFRAGSIZE:
- if (sk->sk_type != SOCK_RAW && sk->sk_type != SOCK_DGRAM)
- goto e_inval;
- inet_assign_bit(RECVFRAGSIZE, sk, val);
- break;
case IP_TOS: /* This sets both TOS and Precedence */
__ip_sock_set_tos(sk, val);
break;
@@ -1544,6 +1546,37 @@ int do_ip_getsockopt(struct sock *sk, int level, int optname,
if (len < 0)
return -EINVAL;
+ /* Handle options that can be read without locking the socket. */
+ switch (optname) {
+ case IP_PKTINFO:
+ val = inet_test_bit(PKTINFO, sk);
+ goto copyval;
+ case IP_RECVTTL:
+ val = inet_test_bit(TTL, sk);
+ goto copyval;
+ case IP_RECVTOS:
+ val = inet_test_bit(TOS, sk);
+ goto copyval;
+ case IP_RECVOPTS:
+ val = inet_test_bit(RECVOPTS, sk);
+ goto copyval;
+ case IP_RETOPTS:
+ val = inet_test_bit(RETOPTS, sk);
+ goto copyval;
+ case IP_PASSSEC:
+ val = inet_test_bit(PASSSEC, sk);
+ goto copyval;
+ case IP_RECVORIGDSTADDR:
+ val = inet_test_bit(ORIGDSTADDR, sk);
+ goto copyval;
+ case IP_CHECKSUM:
+ val = inet_test_bit(CHECKSUM, sk);
+ goto copyval;
+ case IP_RECVFRAGSIZE:
+ val = inet_test_bit(RECVFRAGSIZE, sk);
+ goto copyval;
+ }
+
if (needs_rtnl)
rtnl_lock();
sockopt_lock_sock(sk);
@@ -1578,33 +1611,6 @@ int do_ip_getsockopt(struct sock *sk, int level, int optname,
return -EFAULT;
return 0;
}
- case IP_PKTINFO:
- val = inet_test_bit(PKTINFO, sk);
- break;
- case IP_RECVTTL:
- val = inet_test_bit(TTL, sk);
- break;
- case IP_RECVTOS:
- val = inet_test_bit(TOS, sk);
- break;
- case IP_RECVOPTS:
- val = inet_test_bit(RECVOPTS, sk);
- break;
- case IP_RETOPTS:
- val = inet_test_bit(RETOPTS, sk);
- break;
- case IP_PASSSEC:
- val = inet_test_bit(PASSSEC, sk);
- break;
- case IP_RECVORIGDSTADDR:
- val = inet_test_bit(ORIGDSTADDR, sk);
- break;
- case IP_CHECKSUM:
- val = inet_test_bit(CHECKSUM, sk);
- break;
- case IP_RECVFRAGSIZE:
- val = inet_test_bit(RECVFRAGSIZE, sk);
- break;
case IP_TOS:
val = inet->tos;
break;
@@ -1754,7 +1760,7 @@ int do_ip_getsockopt(struct sock *sk, int level, int optname,
return -ENOPROTOOPT;
}
sockopt_release_sock(sk);
-
+copyval:
if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
unsigned char ucval = (unsigned char)val;
len = 1;
--
2.41.0.640.ga95def55d0-goog
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