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authorEric Dumazet <edumazet@google.com>2023-03-16 04:10:11 +0300
committerDavid S. Miller <davem@davemloft.net>2023-03-17 11:52:05 +0300
commit164bddace2e03f6005e650cb88f101a66ebdc05a (patch)
tree862fb745ff1aa864b0f0b3f46d2b39f6c8bd1f48 /net/packet
parent7438344660fa55b33b8234c1797c886eb73667a7 (diff)
downloadlinux-164bddace2e03f6005e650cb88f101a66ebdc05a.tar.xz
net/packet: convert po->tp_loss to an atomic flag
tp_loss can be read locklessly. Convert it to an atomic flag to avoid races. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/packet')
-rw-r--r--net/packet/af_packet.c6
-rw-r--r--net/packet/diag.c2
-rw-r--r--net/packet/internal.h4
3 files changed, 6 insertions, 6 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 7800dc622ff3..119063c8a1c5 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -2843,7 +2843,7 @@ static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
if (unlikely(tp_len < 0)) {
tpacket_error:
- if (po->tp_loss) {
+ if (packet_sock_flag(po, PACKET_SOCK_TP_LOSS)) {
__packet_set_status(po, ph,
TP_STATUS_AVAILABLE);
packet_increment_head(&po->tx_ring);
@@ -3886,7 +3886,7 @@ packet_setsockopt(struct socket *sock, int level, int optname, sockptr_t optval,
if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) {
ret = -EBUSY;
} else {
- po->tp_loss = !!val;
+ packet_sock_flag_set(po, PACKET_SOCK_TP_LOSS, val);
ret = 0;
}
release_sock(sk);
@@ -4095,7 +4095,7 @@ static int packet_getsockopt(struct socket *sock, int level, int optname,
val = po->tp_reserve;
break;
case PACKET_LOSS:
- val = po->tp_loss;
+ val = packet_sock_flag(po, PACKET_SOCK_TP_LOSS);
break;
case PACKET_TIMESTAMP:
val = READ_ONCE(po->tp_tstamp);
diff --git a/net/packet/diag.c b/net/packet/diag.c
index 0abca32e2f87..8bb4ce6a8e61 100644
--- a/net/packet/diag.c
+++ b/net/packet/diag.c
@@ -29,7 +29,7 @@ static int pdiag_put_info(const struct packet_sock *po, struct sk_buff *nlskb)
pinfo.pdi_flags |= PDI_ORIGDEV;
if (po->has_vnet_hdr)
pinfo.pdi_flags |= PDI_VNETHDR;
- if (po->tp_loss)
+ if (packet_sock_flag(po, PACKET_SOCK_TP_LOSS))
pinfo.pdi_flags |= PDI_LOSS;
return nla_put(nlskb, PACKET_DIAG_INFO, sizeof(pinfo), &pinfo);
diff --git a/net/packet/internal.h b/net/packet/internal.h
index 0d16a581e271..9d406a92ede8 100644
--- a/net/packet/internal.h
+++ b/net/packet/internal.h
@@ -118,8 +118,7 @@ struct packet_sock {
struct mutex pg_vec_lock;
unsigned long flags;
unsigned int running; /* bind_lock must be held */
- unsigned int has_vnet_hdr:1, /* writer must hold sock lock */
- tp_loss:1;
+ unsigned int has_vnet_hdr:1; /* writer must hold sock lock */
int pressure;
int ifindex; /* bound device */
__be16 num;
@@ -146,6 +145,7 @@ enum packet_sock_flags {
PACKET_SOCK_ORIGDEV,
PACKET_SOCK_AUXDATA,
PACKET_SOCK_TX_HAS_OFF,
+ PACKET_SOCK_TP_LOSS,
};
static inline void packet_sock_flag_set(struct packet_sock *po,