diff options
author | Rick Jones <rick.jones2@hp.com> | 2014-11-17 22:04:29 (GMT) |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2014-11-18 20:28:28 (GMT) |
commit | e3e3217029a35c579bf100998b43976d0b1cb8d7 (patch) | |
tree | dc2e5073002588cea3bb600e9df7d8de00359d86 /net/ipv4/icmp.c | |
parent | 54aeba7f06323e04d59a6053ee3c6023079667b2 (diff) | |
download | linux-e3e3217029a35c579bf100998b43976d0b1cb8d7.tar.xz |
icmp: Remove some spurious dropped packet profile hits from the ICMP path
If icmp_rcv() has successfully processed the incoming ICMP datagram, we
should use consume_skb() rather than kfree_skb() because a hit on the likes
of perf -e skb:kfree_skb is not called-for.
Signed-off-by: Rick Jones <rick.jones2@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/icmp.c')
-rw-r--r-- | net/ipv4/icmp.c | 43 |
1 files changed, 28 insertions, 15 deletions
diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c index 36b7bfa..36f5584 100644 --- a/net/ipv4/icmp.c +++ b/net/ipv4/icmp.c @@ -190,7 +190,7 @@ EXPORT_SYMBOL(icmp_err_convert); */ struct icmp_control { - void (*handler)(struct sk_buff *skb); + bool (*handler)(struct sk_buff *skb); short error; /* This ICMP is classed as an error message */ }; @@ -746,7 +746,7 @@ static bool icmp_tag_validation(int proto) * ICMP_PARAMETERPROB. */ -static void icmp_unreach(struct sk_buff *skb) +static bool icmp_unreach(struct sk_buff *skb) { const struct iphdr *iph; struct icmphdr *icmph; @@ -839,10 +839,10 @@ static void icmp_unreach(struct sk_buff *skb) icmp_socket_deliver(skb, info); out: - return; + return true; out_err: ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS); - goto out; + return false; } @@ -850,17 +850,20 @@ out_err: * Handle ICMP_REDIRECT. */ -static void icmp_redirect(struct sk_buff *skb) +static bool icmp_redirect(struct sk_buff *skb) { if (skb->len < sizeof(struct iphdr)) { ICMP_INC_STATS_BH(dev_net(skb->dev), ICMP_MIB_INERRORS); - return; + return false; } - if (!pskb_may_pull(skb, sizeof(struct iphdr))) - return; + if (!pskb_may_pull(skb, sizeof(struct iphdr))) { + /* there aught to be a stat */ + return false; + } icmp_socket_deliver(skb, icmp_hdr(skb)->un.gateway); + return true; } /* @@ -875,7 +878,7 @@ static void icmp_redirect(struct sk_buff *skb) * See also WRT handling of options once they are done and working. */ -static void icmp_echo(struct sk_buff *skb) +static bool icmp_echo(struct sk_buff *skb) { struct net *net; @@ -891,6 +894,8 @@ static void icmp_echo(struct sk_buff *skb) icmp_param.head_len = sizeof(struct icmphdr); icmp_reply(&icmp_param, skb); } + /* should there be an ICMP stat for ignored echos? */ + return true; } /* @@ -900,7 +905,7 @@ static void icmp_echo(struct sk_buff *skb) * MUST be accurate to a few minutes. * MUST be updated at least at 15Hz. */ -static void icmp_timestamp(struct sk_buff *skb) +static bool icmp_timestamp(struct sk_buff *skb) { struct timespec tv; struct icmp_bxm icmp_param; @@ -927,15 +932,17 @@ static void icmp_timestamp(struct sk_buff *skb) icmp_param.data_len = 0; icmp_param.head_len = sizeof(struct icmphdr) + 12; icmp_reply(&icmp_param, skb); -out: - return; + return true; + out_err: ICMP_INC_STATS_BH(dev_net(skb_dst(skb)->dev), ICMP_MIB_INERRORS); - goto out; + return false; } -static void icmp_discard(struct sk_buff *skb) +static bool icmp_discard(struct sk_buff *skb) { + /* pretend it was a success */ + return true; } /* @@ -946,6 +953,7 @@ int icmp_rcv(struct sk_buff *skb) struct icmphdr *icmph; struct rtable *rt = skb_rtable(skb); struct net *net = dev_net(rt->dst.dev); + bool success; if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) { struct sec_path *sp = skb_sec_path(skb); @@ -1012,7 +1020,12 @@ int icmp_rcv(struct sk_buff *skb) } } - icmp_pointers[icmph->type].handler(skb); + success = icmp_pointers[icmph->type].handler(skb); + + if (success) { + consume_skb(skb); + return 0; + } drop: kfree_skb(skb); |