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Message-ID: <20230812093344.3561556-2-edumazet@google.com>
Date: Sat, 12 Aug 2023 09:33:30 +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 01/15] inet: introduce inet->inet_flags
Various inet fields are currently racy.
do_ip_setsockopt() and do_ip_getsockopt() are mostly holding
the socket lock, but some (fast) paths do not.
Use a new inet->inet_flags to hold atomic bits in the series.
Remove inet->cmsg_flags, and use instead 9 bits from inet_flags.
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Acked-by: Soheil Hassas Yeganeh <soheil@...gle.com>
---
include/net/inet_sock.h | 55 +++++++++++++++++++++------
net/ipv4/ip_sockglue.c | 84 +++++++++++++++--------------------------
net/ipv4/ping.c | 5 ++-
net/ipv4/raw.c | 2 +-
net/ipv4/udp.c | 2 +-
net/ipv6/datagram.c | 2 +-
net/ipv6/udp.c | 2 +-
net/l2tp/l2tp_ip.c | 2 +-
8 files changed, 83 insertions(+), 71 deletions(-)
diff --git a/include/net/inet_sock.h b/include/net/inet_sock.h
index 0bb32bfc61832dd787abcb2db3ee85d55c83f2c9..e3b35b0015f335fefa350fd81797a9466ba32f32 100644
--- a/include/net/inet_sock.h
+++ b/include/net/inet_sock.h
@@ -194,6 +194,7 @@ struct rtable;
* @inet_rcv_saddr - Bound local IPv4 addr
* @inet_dport - Destination port
* @inet_num - Local port
+ * @inet_flags - various atomic flags
* @inet_saddr - Sending source
* @uc_ttl - Unicast TTL
* @inet_sport - Source port
@@ -218,11 +219,11 @@ struct inet_sock {
#define inet_dport sk.__sk_common.skc_dport
#define inet_num sk.__sk_common.skc_num
+ unsigned long inet_flags;
__be32 inet_saddr;
__s16 uc_ttl;
- __u16 cmsg_flags;
- struct ip_options_rcu __rcu *inet_opt;
__be16 inet_sport;
+ struct ip_options_rcu __rcu *inet_opt;
__u16 inet_id;
__u8 tos;
@@ -259,16 +260,48 @@ struct inet_sock {
#define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */
#define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */
+enum {
+ INET_FLAGS_PKTINFO = 0,
+ INET_FLAGS_TTL = 1,
+ INET_FLAGS_TOS = 2,
+ INET_FLAGS_RECVOPTS = 3,
+ INET_FLAGS_RETOPTS = 4,
+ INET_FLAGS_PASSSEC = 5,
+ INET_FLAGS_ORIGDSTADDR = 6,
+ INET_FLAGS_CHECKSUM = 7,
+ INET_FLAGS_RECVFRAGSIZE = 8,
+};
+
/* cmsg flags for inet */
-#define IP_CMSG_PKTINFO BIT(0)
-#define IP_CMSG_TTL BIT(1)
-#define IP_CMSG_TOS BIT(2)
-#define IP_CMSG_RECVOPTS BIT(3)
-#define IP_CMSG_RETOPTS BIT(4)
-#define IP_CMSG_PASSSEC BIT(5)
-#define IP_CMSG_ORIGDSTADDR BIT(6)
-#define IP_CMSG_CHECKSUM BIT(7)
-#define IP_CMSG_RECVFRAGSIZE BIT(8)
+#define IP_CMSG_PKTINFO BIT(INET_FLAGS_PKTINFO)
+#define IP_CMSG_TTL BIT(INET_FLAGS_TTL)
+#define IP_CMSG_TOS BIT(INET_FLAGS_TOS)
+#define IP_CMSG_RECVOPTS BIT(INET_FLAGS_RECVOPTS)
+#define IP_CMSG_RETOPTS BIT(INET_FLAGS_RETOPTS)
+#define IP_CMSG_PASSSEC BIT(INET_FLAGS_PASSSEC)
+#define IP_CMSG_ORIGDSTADDR BIT(INET_FLAGS_ORIGDSTADDR)
+#define IP_CMSG_CHECKSUM BIT(INET_FLAGS_CHECKSUM)
+#define IP_CMSG_RECVFRAGSIZE BIT(INET_FLAGS_RECVFRAGSIZE)
+
+#define IP_CMSG_ALL (IP_CMSG_PKTINFO | IP_CMSG_TTL | \
+ IP_CMSG_TOS | IP_CMSG_RECVOPTS | \
+ IP_CMSG_RETOPTS | IP_CMSG_PASSSEC | \
+ IP_CMSG_ORIGDSTADDR | IP_CMSG_CHECKSUM | \
+ IP_CMSG_RECVFRAGSIZE)
+
+static inline unsigned long inet_cmsg_flags(const struct inet_sock *inet)
+{
+ return READ_ONCE(inet->inet_flags) & IP_CMSG_ALL;
+}
+
+#define inet_test_bit(nr, sk) \
+ test_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags)
+#define inet_set_bit(nr, sk) \
+ set_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags)
+#define inet_clear_bit(nr, sk) \
+ clear_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags)
+#define inet_assign_bit(nr, sk, val) \
+ assign_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags, val)
static inline bool sk_is_inet(struct sock *sk)
{
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index d41bce8927b2cca825a804dc113450b62262cc94..66f55f3db5ec88e1c771847444eba1d554aca8dc 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -171,8 +171,10 @@ static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk,
struct sk_buff *skb, int tlen, int offset)
{
- struct inet_sock *inet = inet_sk(sk);
- unsigned int flags = inet->cmsg_flags;
+ unsigned long flags = inet_cmsg_flags(inet_sk(sk));
+
+ if (!flags)
+ return;
/* Ordered by supposed usage frequency */
if (flags & IP_CMSG_PKTINFO) {
@@ -568,7 +570,7 @@ int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) {
sin->sin_family = AF_INET;
sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
- if (inet_sk(sk)->cmsg_flags)
+ if (inet_cmsg_flags(inet_sk(sk)))
ip_cmsg_recv(msg, skb);
}
@@ -635,7 +637,7 @@ EXPORT_SYMBOL(ip_sock_set_mtu_discover);
void ip_sock_set_pktinfo(struct sock *sk)
{
lock_sock(sk);
- inet_sk(sk)->cmsg_flags |= IP_CMSG_PKTINFO;
+ inet_set_bit(PKTINFO, sk);
release_sock(sk);
}
EXPORT_SYMBOL(ip_sock_set_pktinfo);
@@ -990,67 +992,43 @@ int do_ip_setsockopt(struct sock *sk, int level, int optname,
break;
}
case IP_PKTINFO:
- if (val)
- inet->cmsg_flags |= IP_CMSG_PKTINFO;
- else
- inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
+ inet_assign_bit(PKTINFO, sk, val);
break;
case IP_RECVTTL:
- if (val)
- inet->cmsg_flags |= IP_CMSG_TTL;
- else
- inet->cmsg_flags &= ~IP_CMSG_TTL;
+ inet_assign_bit(TTL, sk, val);
break;
case IP_RECVTOS:
- if (val)
- inet->cmsg_flags |= IP_CMSG_TOS;
- else
- inet->cmsg_flags &= ~IP_CMSG_TOS;
+ inet_assign_bit(TOS, sk, val);
break;
case IP_RECVOPTS:
- if (val)
- inet->cmsg_flags |= IP_CMSG_RECVOPTS;
- else
- inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
+ inet_assign_bit(RECVOPTS, sk, val);
break;
case IP_RETOPTS:
- if (val)
- inet->cmsg_flags |= IP_CMSG_RETOPTS;
- else
- inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
+ inet_assign_bit(RETOPTS, sk, val);
break;
case IP_PASSSEC:
- if (val)
- inet->cmsg_flags |= IP_CMSG_PASSSEC;
- else
- inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
+ inet_assign_bit(PASSSEC, sk, val);
break;
case IP_RECVORIGDSTADDR:
- if (val)
- inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
- else
- inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
+ inet_assign_bit(ORIGDSTADDR, sk, val);
break;
case IP_CHECKSUM:
if (val) {
- if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) {
+ if (!(inet_test_bit(CHECKSUM, sk))) {
inet_inc_convert_csum(sk);
- inet->cmsg_flags |= IP_CMSG_CHECKSUM;
+ inet_set_bit(CHECKSUM, sk);
}
} else {
- if (inet->cmsg_flags & IP_CMSG_CHECKSUM) {
+ if (inet_test_bit(CHECKSUM, sk)) {
inet_dec_convert_csum(sk);
- inet->cmsg_flags &= ~IP_CMSG_CHECKSUM;
+ inet_clear_bit(CHECKSUM, sk);
}
}
break;
case IP_RECVFRAGSIZE:
if (sk->sk_type != SOCK_RAW && sk->sk_type != SOCK_DGRAM)
goto e_inval;
- if (val)
- inet->cmsg_flags |= IP_CMSG_RECVFRAGSIZE;
- else
- inet->cmsg_flags &= ~IP_CMSG_RECVFRAGSIZE;
+ inet_assign_bit(RECVFRAGSIZE, sk, val);
break;
case IP_TOS: /* This sets both TOS and Precedence */
__ip_sock_set_tos(sk, val);
@@ -1415,7 +1393,7 @@ int do_ip_setsockopt(struct sock *sk, int level, int optname,
void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb)
{
struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb);
- bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) ||
+ bool prepare = inet_test_bit(PKTINFO, sk) ||
ipv6_sk_rxinfo(sk);
if (prepare && skb_rtable(skb)) {
@@ -1601,31 +1579,31 @@ int do_ip_getsockopt(struct sock *sk, int level, int optname,
return 0;
}
case IP_PKTINFO:
- val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
+ val = inet_test_bit(PKTINFO, sk);
break;
case IP_RECVTTL:
- val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
+ val = inet_test_bit(TTL, sk);
break;
case IP_RECVTOS:
- val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
+ val = inet_test_bit(TOS, sk);
break;
case IP_RECVOPTS:
- val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
+ val = inet_test_bit(RECVOPTS, sk);
break;
case IP_RETOPTS:
- val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
+ val = inet_test_bit(RETOPTS, sk);
break;
case IP_PASSSEC:
- val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
+ val = inet_test_bit(PASSSEC, sk);
break;
case IP_RECVORIGDSTADDR:
- val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
+ val = inet_test_bit(ORIGDSTADDR, sk);
break;
case IP_CHECKSUM:
- val = (inet->cmsg_flags & IP_CMSG_CHECKSUM) != 0;
+ val = inet_test_bit(CHECKSUM, sk);
break;
case IP_RECVFRAGSIZE:
- val = (inet->cmsg_flags & IP_CMSG_RECVFRAGSIZE) != 0;
+ val = inet_test_bit(RECVFRAGSIZE, sk);
break;
case IP_TOS:
val = inet->tos;
@@ -1737,7 +1715,7 @@ int do_ip_getsockopt(struct sock *sk, int level, int optname,
msg.msg_controllen = len;
msg.msg_flags = in_compat_syscall() ? MSG_CMSG_COMPAT : 0;
- if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
+ if (inet_test_bit(PKTINFO, sk)) {
struct in_pktinfo info;
info.ipi_addr.s_addr = inet->inet_rcv_saddr;
@@ -1745,11 +1723,11 @@ int do_ip_getsockopt(struct sock *sk, int level, int optname,
info.ipi_ifindex = inet->mc_index;
put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
}
- if (inet->cmsg_flags & IP_CMSG_TTL) {
+ if (inet_test_bit(TTL, sk)) {
int hlim = inet->mc_ttl;
put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
}
- if (inet->cmsg_flags & IP_CMSG_TOS) {
+ if (inet_test_bit(TOS, sk)) {
int tos = inet->rcv_tos;
put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos);
}
diff --git a/net/ipv4/ping.c b/net/ipv4/ping.c
index 25dd78cee1792fdbd46873e58a503ab5a45d85b2..7e8702cb6634465f5e319a10e8f845093a354f47 100644
--- a/net/ipv4/ping.c
+++ b/net/ipv4/ping.c
@@ -894,7 +894,7 @@ int ping_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int flags,
*addr_len = sizeof(*sin);
}
- if (isk->cmsg_flags)
+ if (inet_cmsg_flags(isk))
ip_cmsg_recv(msg, skb);
#if IS_ENABLED(CONFIG_IPV6)
@@ -921,7 +921,8 @@ int ping_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int flags,
if (skb->protocol == htons(ETH_P_IPV6) &&
inet6_sk(sk)->rxopt.all)
pingv6_ops.ip6_datagram_recv_specific_ctl(sk, msg, skb);
- else if (skb->protocol == htons(ETH_P_IP) && isk->cmsg_flags)
+ else if (skb->protocol == htons(ETH_P_IP) &&
+ inet_cmsg_flags(isk))
ip_cmsg_recv(msg, skb);
#endif
} else {
diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index cb381f5aa46438394cdec520a99f7a8bc67fcfb9..e6e813f4aa317c3a5f242776a889610ccc1aa72f 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -767,7 +767,7 @@ static int raw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
*addr_len = sizeof(*sin);
}
- if (inet->cmsg_flags)
+ if (inet_cmsg_flags(inet))
ip_cmsg_recv(msg, skb);
if (flags & MSG_TRUNC)
copied = skb->len;
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 3e2f29c14fa8c4ec10009b08e5740b7be052132d..4b791133989c0abe4f869ef0c56649c9d671db1a 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -1870,7 +1870,7 @@ int udp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int flags,
if (udp_sk(sk)->gro_enabled)
udp_cmsg_recv(msg, sk, skb);
- if (inet->cmsg_flags)
+ if (inet_cmsg_flags(inet))
ip_cmsg_recv_offset(msg, sk, skb, sizeof(struct udphdr), off);
err = copied;
diff --git a/net/ipv6/datagram.c b/net/ipv6/datagram.c
index d80d6024cafa90932ba7d749c0b8d4cd8f9d9cc3..41ebc4e574734456357169e883c3d13e42fa66b2 100644
--- a/net/ipv6/datagram.c
+++ b/net/ipv6/datagram.c
@@ -524,7 +524,7 @@ int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
} else {
ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
&sin->sin6_addr);
- if (inet_sk(sk)->cmsg_flags)
+ if (inet_cmsg_flags(inet_sk(sk)))
ip_cmsg_recv(msg, skb);
}
}
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 1ea01b0d9be383b2f7095ca40d89fd1599e0e33f..ebc6ae47cfeadc699e3f5a1f46be85803ff37fdd 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -420,7 +420,7 @@ int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
ip6_datagram_recv_common_ctl(sk, msg, skb);
if (is_udp4) {
- if (inet->cmsg_flags)
+ if (inet_cmsg_flags(inet))
ip_cmsg_recv_offset(msg, sk, skb,
sizeof(struct udphdr), off);
} else {
diff --git a/net/l2tp/l2tp_ip.c b/net/l2tp/l2tp_ip.c
index f9073bc7281f96267f6b40b830a19fa0e8df140f..9a2a9ed3ba478b9d00885b1a00e87f0edde5cb33 100644
--- a/net/l2tp/l2tp_ip.c
+++ b/net/l2tp/l2tp_ip.c
@@ -552,7 +552,7 @@ static int l2tp_ip_recvmsg(struct sock *sk, struct msghdr *msg,
memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
*addr_len = sizeof(*sin);
}
- if (inet->cmsg_flags)
+ if (inet_cmsg_flags(inet))
ip_cmsg_recv(msg, skb);
if (flags & MSG_TRUNC)
copied = skb->len;
--
2.41.0.640.ga95def55d0-goog
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