From: Florian Westphal <fw@xxxxxxxxx>
It is never accessed for reading and the only places that write to it
are the icmp(6) handlers, which also set skb->nfct (and skb->nfctinfo).
The conntrack core specifically checks for attached skb->nfct after
->error() invocation and returns early in this case.
Signed-off-by: Florian Westphal <fw@xxxxxxxxx>
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
---
include/net/netfilter/nf_conntrack_l4proto.h | 2 +-
net/ipv4/netfilter/nf_conntrack_proto_icmp.c | 12 ++++++------
net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c | 12 ++++++------
net/netfilter/nf_conntrack_core.c | 3 +--
net/netfilter/nf_conntrack_proto_dccp.c | 1 -
net/netfilter/nf_conntrack_proto_sctp.c | 2 +-
net/netfilter/nf_conntrack_proto_tcp.c | 1 -
net/netfilter/nf_conntrack_proto_udp.c | 3 +--
8 files changed, 16 insertions(+), 20 deletions(-)
diff --git a/include/net/netfilter/nf_conntrack_l4proto.h b/include/net/netfilter/nf_conntrack_l4proto.h
index e7b836590f0b..85e993e278d5 100644
--- a/include/net/netfilter/nf_conntrack_l4proto.h
+++ b/include/net/netfilter/nf_conntrack_l4proto.h
@@ -55,7 +55,7 @@ struct nf_conntrack_l4proto {
void (*destroy)(struct nf_conn *ct);
int (*error)(struct net *net, struct nf_conn *tmpl, struct sk_buff *skb,
- unsigned int dataoff, enum ip_conntrack_info *ctinfo,
+ unsigned int dataoff,
u_int8_t pf, unsigned int hooknum);
/* Print out the per-protocol part of the tuple. Return like seq_* */
diff --git a/net/ipv4/netfilter/nf_conntrack_proto_icmp.c b/net/ipv4/netfilter/nf_conntrack_proto_icmp.c
index d075b3cf2400..566afac98a88 100644
--- a/net/ipv4/netfilter/nf_conntrack_proto_icmp.c
+++ b/net/ipv4/netfilter/nf_conntrack_proto_icmp.c
@@ -128,13 +128,13 @@ static bool icmp_new(struct nf_conn *ct, const struct sk_buff *skb,
/* Returns conntrack if it dealt with ICMP, and filled in skb fields */
static int
icmp_error_message(struct net *net, struct nf_conn *tmpl, struct sk_buff *skb,
- enum ip_conntrack_info *ctinfo,
unsigned int hooknum)
{
struct nf_conntrack_tuple innertuple, origtuple;
const struct nf_conntrack_l4proto *innerproto;
const struct nf_conntrack_tuple_hash *h;
const struct nf_conntrack_zone *zone;
+ enum ip_conntrack_info ctinfo;
struct nf_conntrack_zone tmp;
NF_CT_ASSERT(skb->nfct == NULL);
@@ -160,7 +160,7 @@ icmp_error_message(struct net *net, struct nf_conn *tmpl, struct sk_buff *skb,
return -NF_ACCEPT;
}
- *ctinfo = IP_CT_RELATED;
+ ctinfo = IP_CT_RELATED;
h = nf_conntrack_find_get(net, zone, &innertuple);
if (!h) {
@@ -169,11 +169,11 @@ icmp_error_message(struct net *net, struct nf_conn *tmpl, struct sk_buff *skb,
}
if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY)
- *ctinfo += IP_CT_IS_REPLY;
+ ctinfo += IP_CT_IS_REPLY;
/* Update skb to refer to this connection */
skb->nfct = &nf_ct_tuplehash_to_ctrack(h)->ct_general;
- skb->nfctinfo = *ctinfo;
+ skb->nfctinfo = ctinfo;
return NF_ACCEPT;
}
@@ -181,7 +181,7 @@ icmp_error_message(struct net *net, struct nf_conn *tmpl, struct sk_buff *skb,
static int
icmp_error(struct net *net, struct nf_conn *tmpl,
struct sk_buff *skb, unsigned int dataoff,
- enum ip_conntrack_info *ctinfo, u_int8_t pf, unsigned int hooknum)
+ u8 pf, unsigned int hooknum)
{
const struct icmphdr *icmph;
struct icmphdr _ih;
@@ -225,7 +225,7 @@ icmp_error(struct net *net, struct nf_conn *tmpl,
icmph->type != ICMP_REDIRECT)
return NF_ACCEPT;
- return icmp_error_message(net, tmpl, skb, ctinfo, hooknum);
+ return icmp_error_message(net, tmpl, skb, hooknum);
}
#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
diff --git a/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c b/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c
index f5a61bc3ec2b..44b9af3f813e 100644
--- a/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c
+++ b/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c
@@ -145,12 +145,12 @@ static int
icmpv6_error_message(struct net *net, struct nf_conn *tmpl,
struct sk_buff *skb,
unsigned int icmp6off,
- enum ip_conntrack_info *ctinfo,
unsigned int hooknum)
{
struct nf_conntrack_tuple intuple, origtuple;
const struct nf_conntrack_tuple_hash *h;
const struct nf_conntrack_l4proto *inproto;
+ enum ip_conntrack_info ctinfo;
struct nf_conntrack_zone tmp;
NF_CT_ASSERT(skb->nfct == NULL);
@@ -176,7 +176,7 @@ icmpv6_error_message(struct net *net, struct nf_conn *tmpl,
return -NF_ACCEPT;
}
- *ctinfo = IP_CT_RELATED;
+ ctinfo = IP_CT_RELATED;
h = nf_conntrack_find_get(net, nf_ct_zone_tmpl(tmpl, skb, &tmp),
&intuple);
@@ -185,19 +185,19 @@ icmpv6_error_message(struct net *net, struct nf_conn *tmpl,
return -NF_ACCEPT;
} else {
if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY)
- *ctinfo += IP_CT_IS_REPLY;
+ ctinfo += IP_CT_IS_REPLY;
}
/* Update skb to refer to this connection */
skb->nfct = &nf_ct_tuplehash_to_ctrack(h)->ct_general;
- skb->nfctinfo = *ctinfo;
+ skb->nfctinfo = ctinfo;
return NF_ACCEPT;
}
static int
icmpv6_error(struct net *net, struct nf_conn *tmpl,
struct sk_buff *skb, unsigned int dataoff,
- enum ip_conntrack_info *ctinfo, u_int8_t pf, unsigned int hooknum)
+ u8 pf, unsigned int hooknum)
{
const struct icmp6hdr *icmp6h;
struct icmp6hdr _ih;
@@ -232,7 +232,7 @@ icmpv6_error(struct net *net, struct nf_conn *tmpl,
if (icmp6h->icmp6_type >= 128)
return NF_ACCEPT;
- return icmpv6_error_message(net, tmpl, skb, dataoff, ctinfo, hooknum);
+ return icmpv6_error_message(net, tmpl, skb, dataoff, hooknum);
}
#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index 3a073cd9fcf4..86186a2e2715 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -1326,8 +1326,7 @@ nf_conntrack_in(struct net *net, u_int8_t pf, unsigned int hooknum,
* inverse of the return code tells to the netfilter
* core what to do with the packet. */
if (l4proto->error != NULL) {
- ret = l4proto->error(net, tmpl, skb, dataoff, &ctinfo,
- pf, hooknum);
+ ret = l4proto->error(net, tmpl, skb, dataoff, pf, hooknum);
if (ret <= 0) {
NF_CT_STAT_INC_ATOMIC(net, error);
NF_CT_STAT_INC_ATOMIC(net, invalid);
diff --git a/net/netfilter/nf_conntrack_proto_dccp.c b/net/netfilter/nf_conntrack_proto_dccp.c
index b68ce6ac13b3..93dd1c5b7bff 100644
--- a/net/netfilter/nf_conntrack_proto_dccp.c
+++ b/net/netfilter/nf_conntrack_proto_dccp.c
@@ -561,7 +561,6 @@ static int dccp_packet(struct nf_conn *ct, const struct sk_buff *skb,
static int dccp_error(struct net *net, struct nf_conn *tmpl,
struct sk_buff *skb, unsigned int dataoff,
- enum ip_conntrack_info *ctinfo,
u_int8_t pf, unsigned int hooknum)
{
struct dccp_hdr _dh, *dh;
diff --git a/net/netfilter/nf_conntrack_proto_sctp.c b/net/netfilter/nf_conntrack_proto_sctp.c
index 44a647418948..33279aab583d 100644
--- a/net/netfilter/nf_conntrack_proto_sctp.c
+++ b/net/netfilter/nf_conntrack_proto_sctp.c
@@ -508,7 +508,7 @@ static bool sctp_new(struct nf_conn *ct, const struct sk_buff *skb,
}
static int sctp_error(struct net *net, struct nf_conn *tpl, struct sk_buff *skb,
- unsigned int dataoff, enum ip_conntrack_info *ctinfo,
+ unsigned int dataoff,
u8 pf, unsigned int hooknum)
{
const struct sctphdr *sh;
diff --git a/net/netfilter/nf_conntrack_proto_tcp.c b/net/netfilter/nf_conntrack_proto_tcp.c
index 69f687740c76..b122e9dacfed 100644
--- a/net/netfilter/nf_conntrack_proto_tcp.c
+++ b/net/netfilter/nf_conntrack_proto_tcp.c
@@ -750,7 +750,6 @@ static const u8 tcp_valid_flags[(TCPHDR_FIN|TCPHDR_SYN|TCPHDR_RST|TCPHDR_ACK|
static int tcp_error(struct net *net, struct nf_conn *tmpl,
struct sk_buff *skb,
unsigned int dataoff,
- enum ip_conntrack_info *ctinfo,
u_int8_t pf,
unsigned int hooknum)
{
diff --git a/net/netfilter/nf_conntrack_proto_udp.c b/net/netfilter/nf_conntrack_proto_udp.c
index ae63944c9dc4..f6ebce6178ca 100644
--- a/net/netfilter/nf_conntrack_proto_udp.c
+++ b/net/netfilter/nf_conntrack_proto_udp.c
@@ -112,7 +112,6 @@ static bool udp_new(struct nf_conn *ct, const struct sk_buff *skb,
static int udplite_error(struct net *net, struct nf_conn *tmpl,
struct sk_buff *skb,
unsigned int dataoff,
- enum ip_conntrack_info *ctinfo,
u8 pf, unsigned int hooknum)
{
unsigned int udplen = skb->len - dataoff;
@@ -162,7 +161,7 @@ static int udplite_error(struct net *net, struct nf_conn *tmpl,
#endif
static int udp_error(struct net *net, struct nf_conn *tmpl, struct sk_buff *skb,
- unsigned int dataoff, enum ip_conntrack_info *ctinfo,
+ unsigned int dataoff,
u_int8_t pf,
unsigned int hooknum)
{
--
2.1.4
--
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