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net: fix the counter ICMP_MIB_INERRORS/ICMP6_MIB_INERRORS 

When dealing with ICMPv[46] Error Message, function icmp_socket_deliver()
and icmpv6_notify() do some valid checks on packet's length, but then some
protocols check packet's length redaudantly. So remove those duplicated
statements, and increase counter ICMP_MIB_INERRORS/ICMP6_MIB_INERRORS in
function icmp_socket_deliver() and icmpv6_notify() respectively.

In addition, add missed counter in udp6/udplite6 when socket is NULL.

Signed-off-by: Duan Jiong <duanj.fnst@cn.fujitsu.com>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Duan Jiong 2014-07-31 17:54:32 +08:00 committed by David S. Miller
parent 299ee123e1
commit 7304fe4681
5 changed files with 17 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
net/ipv4/icmp.c
View File

@ -663,8 +663,10 @@ static void icmp_socket_deliver(struct sk_buff *skb, u32 info)
/* Checkin full IP header plus 8 bytes of protocol to /* Checkin full IP header plus 8 bytes of protocol to
* avoid additional coding at protocol handlers. * avoid additional coding at protocol handlers.
*/ */
if (!pskb_may_pull(skb, iph->ihl * 4 + 8)) if (!pskb_may_pull(skb, iph->ihl * 4 + 8)) {
ICMP_INC_STATS_BH(dev_net(skb->dev), ICMP_MIB_INERRORS);
return; return;
}
raw_icmp_error(skb, protocol, info); raw_icmp_error(skb, protocol, info);

5
net/ipv4/tcp_ipv4.c
View File

@ -344,11 +344,6 @@ void tcp_v4_err(struct sk_buff *icmp_skb, u32 info)
int err; int err;
struct net *net = dev_net(icmp_skb->dev); struct net *net = dev_net(icmp_skb->dev);
if (icmp_skb->len < (iph->ihl << 2) + 8) {
ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS);
return;
}
sk = inet_lookup(net, &tcp_hashinfo, iph->daddr, th->dest, sk = inet_lookup(net, &tcp_hashinfo, iph->daddr, th->dest,
iph->saddr, th->source, inet_iif(icmp_skb)); iph->saddr, th->source, inet_iif(icmp_skb));
if (!sk) { if (!sk) {

13
net/ipv6/icmp.c
View File

@ -626,9 +626,10 @@ void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info)
int inner_offset; int inner_offset;
__be16 frag_off; __be16 frag_off;
u8 nexthdr; u8 nexthdr;
struct net *net = dev_net(skb->dev);
if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
return; goto out;
nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr;
if (ipv6_ext_hdr(nexthdr)) { if (ipv6_ext_hdr(nexthdr)) {
@ -636,14 +637,14 @@ void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info)
inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr),
&nexthdr, &frag_off); &nexthdr, &frag_off);
if (inner_offset<0) if (inner_offset<0)
return; goto out;
} else { } else {
inner_offset = sizeof(struct ipv6hdr); inner_offset = sizeof(struct ipv6hdr);
} }
/* Checkin header including 8 bytes of inner protocol header. */ /* Checkin header including 8 bytes of inner protocol header. */
if (!pskb_may_pull(skb, inner_offset+8)) if (!pskb_may_pull(skb, inner_offset+8))
return; goto out;
/* BUGGG_FUTURE: we should try to parse exthdrs in this packet. /* BUGGG_FUTURE: we should try to parse exthdrs in this packet.
Without this we will not able f.e. to make source routed Without this we will not able f.e. to make source routed
@ -652,13 +653,15 @@ void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info)
--ANK (980726) --ANK (980726)
*/ */
rcu_read_lock();
ipprot = rcu_dereference(inet6_protos[nexthdr]); ipprot = rcu_dereference(inet6_protos[nexthdr]);
if (ipprot && ipprot->err_handler) if (ipprot && ipprot->err_handler)
ipprot->err_handler(skb, NULL, type, code, inner_offset, info); ipprot->err_handler(skb, NULL, type, code, inner_offset, info);
rcu_read_unlock();
raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info); raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info);
return;
out:
ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
} }
/* /*

8
net/ipv6/udp.c
View File

@ -533,11 +533,15 @@ void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
struct udphdr *uh = (struct udphdr*)(skb->data+offset); struct udphdr *uh = (struct udphdr*)(skb->data+offset);
struct sock *sk; struct sock *sk;
int err; int err;
struct net *net = dev_net(skb->dev);
sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest, sk = __udp6_lib_lookup(net, daddr, uh->dest,
saddr, uh->source, inet6_iif(skb), udptable); saddr, uh->source, inet6_iif(skb), udptable);
if (sk == NULL) if (sk == NULL) {
ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
ICMP6_MIB_INERRORS);
return; return;
}
if (type == ICMPV6_PKT_TOOBIG) { if (type == ICMPV6_PKT_TOOBIG) {
if (!ip6_sk_accept_pmtu(sk)) if (!ip6_sk_accept_pmtu(sk))

5
net/sctp/input.c
View File

@ -575,11 +575,6 @@ void sctp_v4_err(struct sk_buff *skb, __u32 info)
int err; int err;
struct net *net = dev_net(skb->dev); struct net *net = dev_net(skb->dev);
if (skb->len < ihlen + 8) {
ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS);
return;
}
/* Fix up skb to look at the embedded net header. */ /* Fix up skb to look at the embedded net header. */
saveip = skb->network_header; saveip = skb->network_header;
savesctp = skb->transport_header; savesctp = skb->transport_header;