diff options
author | Eric Dumazet <edumazet@google.com> | 2012-04-19 21:56:11 +0000 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2012-04-21 16:36:42 -0400 |
commit | c06fff6e175729f0d89201c98d21e55c2bf1a850 (patch) | |
tree | d60332d8bdfd452dadcd94739762308952fca6af | |
parent | 900f65d361d333c949ef76a828343075f4fdf523 (diff) | |
download | linux-c06fff6e175729f0d89201c98d21e55c2bf1a850.tar.bz2 |
af_packet: packet_getsockopt() cleanup
Factorize code, since most fetched values are int type.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r-- | net/packet/af_packet.c | 46 |
1 files changed, 8 insertions, 38 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index 40053a08f009..0f661745df0f 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -3224,10 +3224,10 @@ static int packet_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen) { int len; - int val; + int val, lv = sizeof(val); struct sock *sk = sock->sk; struct packet_sock *po = pkt_sk(sk); - void *data; + void *data = &val; struct tpacket_stats st; union tpacket_stats_u st_u; @@ -3242,21 +3242,17 @@ static int packet_getsockopt(struct socket *sock, int level, int optname, switch (optname) { case PACKET_STATISTICS: - if (po->tp_version == TPACKET_V3) { - len = sizeof(struct tpacket_stats_v3); - } else { - if (len > sizeof(struct tpacket_stats)) - len = sizeof(struct tpacket_stats); - } spin_lock_bh(&sk->sk_receive_queue.lock); if (po->tp_version == TPACKET_V3) { + lv = sizeof(struct tpacket_stats_v3); memcpy(&st_u.stats3, &po->stats, - sizeof(struct tpacket_stats)); + sizeof(struct tpacket_stats)); st_u.stats3.tp_freeze_q_cnt = - po->stats_u.stats3.tp_freeze_q_cnt; + po->stats_u.stats3.tp_freeze_q_cnt; st_u.stats3.tp_packets += po->stats.tp_drops; data = &st_u.stats3; } else { + lv = sizeof(struct tpacket_stats); st = po->stats; st.tp_packets += st.tp_drops; data = &st; @@ -3265,31 +3261,16 @@ static int packet_getsockopt(struct socket *sock, int level, int optname, spin_unlock_bh(&sk->sk_receive_queue.lock); break; case PACKET_AUXDATA: - if (len > sizeof(int)) - len = sizeof(int); val = po->auxdata; - - data = &val; break; case PACKET_ORIGDEV: - if (len > sizeof(int)) - len = sizeof(int); val = po->origdev; - - data = &val; break; case PACKET_VNET_HDR: - if (len > sizeof(int)) - len = sizeof(int); val = po->has_vnet_hdr; - - data = &val; break; case PACKET_VERSION: - if (len > sizeof(int)) - len = sizeof(int); val = po->tp_version; - data = &val; break; case PACKET_HDRLEN: if (len > sizeof(int)) @@ -3309,39 +3290,28 @@ static int packet_getsockopt(struct socket *sock, int level, int optname, default: return -EINVAL; } - data = &val; break; case PACKET_RESERVE: - if (len > sizeof(unsigned int)) - len = sizeof(unsigned int); val = po->tp_reserve; - data = &val; break; case PACKET_LOSS: - if (len > sizeof(unsigned int)) - len = sizeof(unsigned int); val = po->tp_loss; - data = &val; break; case PACKET_TIMESTAMP: - if (len > sizeof(int)) - len = sizeof(int); val = po->tp_tstamp; - data = &val; break; case PACKET_FANOUT: - if (len > sizeof(int)) - len = sizeof(int); val = (po->fanout ? ((u32)po->fanout->id | ((u32)po->fanout->type << 16)) : 0); - data = &val; break; default: return -ENOPROTOOPT; } + if (len > lv) + len = lv; if (put_user(len, optlen)) return -EFAULT; if (copy_to_user(optval, data, len)) |