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Message-Id: <20171107005213.22618-6-pablo@netfilter.org>
Date: Tue, 7 Nov 2017 01:51:55 +0100
From: Pablo Neira Ayuso <pablo@...filter.org>
To: netfilter-devel@...r.kernel.org
Cc: davem@...emloft.net, netdev@...r.kernel.org
Subject: [PATCH 05/23] netfilter: conntrack: add and use nf_l4proto_log_invalid
From: Florian Westphal <fw@...len.de>
We currently pass down the l4 protocol to the conntrack ->packet()
function, but the only user of this is the debug info decision.
Same information can be derived from struct nf_conn.
As a first step, add and use a new log function for this, similar to
nf_ct_helper_log().
Add __cold annotation -- invalid packets should be infrequent so
gcc can consider all call paths that lead to such a function as
unlikely.
Signed-off-by: Florian Westphal <fw@...len.de>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
include/net/netfilter/nf_conntrack_l4proto.h | 10 +++++++
net/ipv4/netfilter/nf_conntrack_proto_icmp.c | 18 ++++++------
net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c | 14 +++++----
net/netfilter/nf_conntrack_proto.c | 24 ++++++++++++++++
net/netfilter/nf_conntrack_proto_dccp.c | 3 +-
net/netfilter/nf_conntrack_proto_sctp.c | 3 +-
net/netfilter/nf_conntrack_proto_tcp.c | 22 +++++++-------
net/netfilter/nf_conntrack_proto_udp.c | 40 ++++++++++++--------------
8 files changed, 82 insertions(+), 52 deletions(-)
diff --git a/include/net/netfilter/nf_conntrack_l4proto.h b/include/net/netfilter/nf_conntrack_l4proto.h
index 738a0307a96b..6d79a061d360 100644
--- a/include/net/netfilter/nf_conntrack_l4proto.h
+++ b/include/net/netfilter/nf_conntrack_l4proto.h
@@ -152,8 +152,18 @@ extern const struct nla_policy nf_ct_port_nla_policy[];
#define LOG_INVALID(net, proto) \
((net)->ct.sysctl_log_invalid == (proto) || \
(net)->ct.sysctl_log_invalid == IPPROTO_RAW)
+
+__printf(5, 6) __cold
+void nf_l4proto_log_invalid(const struct sk_buff *skb,
+ struct net *net,
+ u16 pf, u8 protonum,
+ const char *fmt, ...);
#else
static inline int LOG_INVALID(struct net *net, int proto) { return 0; }
+
+static inline __printf(5, 6) __cold
+void nf_l4proto_log_invalid(const struct sk_buff *skb, struct net *net,
+ u16 pf, u8 protonum, const char *fmt, ...) {}
#endif /* CONFIG_SYSCTL */
#endif /*_NF_CONNTRACK_PROTOCOL_H*/
diff --git a/net/ipv4/netfilter/nf_conntrack_proto_icmp.c b/net/ipv4/netfilter/nf_conntrack_proto_icmp.c
index a046c298413a..7281a7b77a0e 100644
--- a/net/ipv4/netfilter/nf_conntrack_proto_icmp.c
+++ b/net/ipv4/netfilter/nf_conntrack_proto_icmp.c
@@ -165,6 +165,12 @@ icmp_error_message(struct net *net, struct nf_conn *tmpl, struct sk_buff *skb,
return NF_ACCEPT;
}
+static void icmp_error_log(const struct sk_buff *skb, struct net *net,
+ u8 pf, const char *msg)
+{
+ nf_l4proto_log_invalid(skb, net, pf, IPPROTO_ICMP, "%s", msg);
+}
+
/* Small and modified version of icmp_rcv */
static int
icmp_error(struct net *net, struct nf_conn *tmpl,
@@ -177,18 +183,14 @@ icmp_error(struct net *net, struct nf_conn *tmpl,
/* Not enough header? */
icmph = skb_header_pointer(skb, ip_hdrlen(skb), sizeof(_ih), &_ih);
if (icmph == NULL) {
- if (LOG_INVALID(net, IPPROTO_ICMP))
- nf_log_packet(net, PF_INET, 0, skb, NULL, NULL,
- NULL, "nf_ct_icmp: short packet ");
+ icmp_error_log(skb, net, pf, "short packet");
return -NF_ACCEPT;
}
/* See ip_conntrack_proto_tcp.c */
if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING &&
nf_ip_checksum(skb, hooknum, dataoff, 0)) {
- if (LOG_INVALID(net, IPPROTO_ICMP))
- nf_log_packet(net, PF_INET, 0, skb, NULL, NULL, NULL,
- "nf_ct_icmp: bad HW ICMP checksum ");
+ icmp_error_log(skb, net, pf, "bad hw icmp checksum");
return -NF_ACCEPT;
}
@@ -199,9 +201,7 @@ icmp_error(struct net *net, struct nf_conn *tmpl,
* discarded.
*/
if (icmph->type > NR_ICMP_TYPES) {
- if (LOG_INVALID(net, IPPROTO_ICMP))
- nf_log_packet(net, PF_INET, 0, skb, NULL, NULL, NULL,
- "nf_ct_icmp: invalid ICMP type ");
+ icmp_error_log(skb, net, pf, "invalid icmp type");
return -NF_ACCEPT;
}
diff --git a/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c b/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c
index a9e1fd1a8536..0f227ca4a5a2 100644
--- a/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c
+++ b/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c
@@ -176,6 +176,12 @@ icmpv6_error_message(struct net *net, struct nf_conn *tmpl,
return NF_ACCEPT;
}
+static void icmpv6_error_log(const struct sk_buff *skb, struct net *net,
+ u8 pf, const char *msg)
+{
+ nf_l4proto_log_invalid(skb, net, pf, IPPROTO_ICMPV6, "%s", msg);
+}
+
static int
icmpv6_error(struct net *net, struct nf_conn *tmpl,
struct sk_buff *skb, unsigned int dataoff,
@@ -187,17 +193,13 @@ icmpv6_error(struct net *net, struct nf_conn *tmpl,
icmp6h = skb_header_pointer(skb, dataoff, sizeof(_ih), &_ih);
if (icmp6h == NULL) {
- if (LOG_INVALID(net, IPPROTO_ICMPV6))
- nf_log_packet(net, PF_INET6, 0, skb, NULL, NULL, NULL,
- "nf_ct_icmpv6: short packet ");
+ icmpv6_error_log(skb, net, pf, "short packet");
return -NF_ACCEPT;
}
if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING &&
nf_ip6_checksum(skb, hooknum, dataoff, IPPROTO_ICMPV6)) {
- if (LOG_INVALID(net, IPPROTO_ICMPV6))
- nf_log_packet(net, PF_INET6, 0, skb, NULL, NULL, NULL,
- "nf_ct_icmpv6: ICMPv6 checksum failed ");
+ icmpv6_error_log(skb, net, pf, "ICMPv6 checksum failed");
return -NF_ACCEPT;
}
diff --git a/net/netfilter/nf_conntrack_proto.c b/net/netfilter/nf_conntrack_proto.c
index b3e489c859ec..bcd3ee270d75 100644
--- a/net/netfilter/nf_conntrack_proto.c
+++ b/net/netfilter/nf_conntrack_proto.c
@@ -27,6 +27,7 @@
#include <net/netfilter/nf_conntrack_l3proto.h>
#include <net/netfilter/nf_conntrack_l4proto.h>
#include <net/netfilter/nf_conntrack_core.h>
+#include <net/netfilter/nf_log.h>
static struct nf_conntrack_l4proto __rcu **nf_ct_protos[NFPROTO_NUMPROTO] __read_mostly;
struct nf_conntrack_l3proto __rcu *nf_ct_l3protos[NFPROTO_NUMPROTO] __read_mostly;
@@ -63,6 +64,29 @@ nf_ct_unregister_sysctl(struct ctl_table_header **header,
*header = NULL;
*table = NULL;
}
+
+__printf(5, 6)
+void nf_l4proto_log_invalid(const struct sk_buff *skb,
+ struct net *net,
+ u16 pf, u8 protonum,
+ const char *fmt, ...)
+{
+ struct va_format vaf;
+ va_list args;
+
+ if (net->ct.sysctl_log_invalid != protonum ||
+ net->ct.sysctl_log_invalid != IPPROTO_RAW)
+ return;
+
+ va_start(args, fmt);
+ vaf.fmt = fmt;
+ vaf.va = &args;
+
+ nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
+ "nf_ct_proto_%d: %pV ", protonum, &vaf);
+ va_end(args);
+}
+EXPORT_SYMBOL_GPL(nf_l4proto_log_invalid);
#endif
const struct nf_conntrack_l4proto *
diff --git a/net/netfilter/nf_conntrack_proto_dccp.c b/net/netfilter/nf_conntrack_proto_dccp.c
index 0f5a4d79f6b8..ef501c7edb96 100644
--- a/net/netfilter/nf_conntrack_proto_dccp.c
+++ b/net/netfilter/nf_conntrack_proto_dccp.c
@@ -604,8 +604,7 @@ static int dccp_error(struct net *net, struct nf_conn *tmpl,
return NF_ACCEPT;
out_invalid:
- if (LOG_INVALID(net, IPPROTO_DCCP))
- nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL, "%s", msg);
+ nf_l4proto_log_invalid(skb, net, pf, IPPROTO_DCCP, "%s", msg);
return -NF_ACCEPT;
}
diff --git a/net/netfilter/nf_conntrack_proto_sctp.c b/net/netfilter/nf_conntrack_proto_sctp.c
index 6303a88af12b..aa630c561361 100644
--- a/net/netfilter/nf_conntrack_proto_sctp.c
+++ b/net/netfilter/nf_conntrack_proto_sctp.c
@@ -522,8 +522,7 @@ static int sctp_error(struct net *net, struct nf_conn *tpl, struct sk_buff *skb,
}
return NF_ACCEPT;
out_invalid:
- if (LOG_INVALID(net, IPPROTO_SCTP))
- nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL, "%s", logmsg);
+ nf_l4proto_log_invalid(skb, net, pf, IPPROTO_SCTP, "%s", logmsg);
return -NF_ACCEPT;
}
diff --git a/net/netfilter/nf_conntrack_proto_tcp.c b/net/netfilter/nf_conntrack_proto_tcp.c
index cba1c6ffe51a..14198b2a2e2c 100644
--- a/net/netfilter/nf_conntrack_proto_tcp.c
+++ b/net/netfilter/nf_conntrack_proto_tcp.c
@@ -738,6 +738,12 @@ static const u8 tcp_valid_flags[(TCPHDR_FIN|TCPHDR_SYN|TCPHDR_RST|TCPHDR_ACK|
[TCPHDR_ACK|TCPHDR_URG] = 1,
};
+static void tcp_error_log(const struct sk_buff *skb, struct net *net,
+ u8 pf, const char *msg)
+{
+ nf_l4proto_log_invalid(skb, net, pf, IPPROTO_TCP, "%s", msg);
+}
+
/* Protect conntrack agaist broken packets. Code taken from ipt_unclean.c. */
static int tcp_error(struct net *net, struct nf_conn *tmpl,
struct sk_buff *skb,
@@ -753,17 +759,13 @@ static int tcp_error(struct net *net, struct nf_conn *tmpl,
/* Smaller that minimal TCP header? */
th = skb_header_pointer(skb, dataoff, sizeof(_tcph), &_tcph);
if (th == NULL) {
- if (LOG_INVALID(net, IPPROTO_TCP))
- nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
- "nf_ct_tcp: short packet ");
+ tcp_error_log(skb, net, pf, "short packet");
return -NF_ACCEPT;
}
/* Not whole TCP header or malformed packet */
if (th->doff*4 < sizeof(struct tcphdr) || tcplen < th->doff*4) {
- if (LOG_INVALID(net, IPPROTO_TCP))
- nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
- "nf_ct_tcp: truncated/malformed packet ");
+ tcp_error_log(skb, net, pf, "truncated packet");
return -NF_ACCEPT;
}
@@ -774,18 +776,14 @@ static int tcp_error(struct net *net, struct nf_conn *tmpl,
/* FIXME: Source route IP option packets --RR */
if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING &&
nf_checksum(skb, hooknum, dataoff, IPPROTO_TCP, pf)) {
- if (LOG_INVALID(net, IPPROTO_TCP))
- nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
- "nf_ct_tcp: bad TCP checksum ");
+ tcp_error_log(skb, net, pf, "bad checksum");
return -NF_ACCEPT;
}
/* Check TCP flags. */
tcpflags = (tcp_flag_byte(th) & ~(TCPHDR_ECE|TCPHDR_CWR|TCPHDR_PSH));
if (!tcp_valid_flags[tcpflags]) {
- if (LOG_INVALID(net, IPPROTO_TCP))
- nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
- "nf_ct_tcp: invalid TCP flag combination ");
+ tcp_error_log(skb, net, pf, "invalid tcp flag combination");
return -NF_ACCEPT;
}
diff --git a/net/netfilter/nf_conntrack_proto_udp.c b/net/netfilter/nf_conntrack_proto_udp.c
index 8af734cd1a94..fc20cf430251 100644
--- a/net/netfilter/nf_conntrack_proto_udp.c
+++ b/net/netfilter/nf_conntrack_proto_udp.c
@@ -99,6 +99,12 @@ static bool udp_new(struct nf_conn *ct, const struct sk_buff *skb,
}
#ifdef CONFIG_NF_CT_PROTO_UDPLITE
+static void udplite_error_log(const struct sk_buff *skb, struct net *net,
+ u8 pf, const char *msg)
+{
+ nf_l4proto_log_invalid(skb, net, pf, IPPROTO_UDPLITE, "%s", msg);
+}
+
static int udplite_error(struct net *net, struct nf_conn *tmpl,
struct sk_buff *skb,
unsigned int dataoff,
@@ -112,9 +118,7 @@ static int udplite_error(struct net *net, struct nf_conn *tmpl,
/* Header is too small? */
hdr = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
if (!hdr) {
- if (LOG_INVALID(net, IPPROTO_UDPLITE))
- nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
- "nf_ct_udplite: short packet ");
+ udplite_error_log(skb, net, pf, "short packet");
return -NF_ACCEPT;
}
@@ -122,17 +126,13 @@ static int udplite_error(struct net *net, struct nf_conn *tmpl,
if (cscov == 0) {
cscov = udplen;
} else if (cscov < sizeof(*hdr) || cscov > udplen) {
- if (LOG_INVALID(net, IPPROTO_UDPLITE))
- nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
- "nf_ct_udplite: invalid checksum coverage ");
+ udplite_error_log(skb, net, pf, "invalid checksum coverage");
return -NF_ACCEPT;
}
/* UDPLITE mandates checksums */
if (!hdr->check) {
- if (LOG_INVALID(net, IPPROTO_UDPLITE))
- nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
- "nf_ct_udplite: checksum missing ");
+ udplite_error_log(skb, net, pf, "checksum missing");
return -NF_ACCEPT;
}
@@ -140,9 +140,7 @@ static int udplite_error(struct net *net, struct nf_conn *tmpl,
if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING &&
nf_checksum_partial(skb, hooknum, dataoff, cscov, IPPROTO_UDP,
pf)) {
- if (LOG_INVALID(net, IPPROTO_UDPLITE))
- nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
- "nf_ct_udplite: bad UDPLite checksum ");
+ udplite_error_log(skb, net, pf, "bad checksum");
return -NF_ACCEPT;
}
@@ -150,6 +148,12 @@ static int udplite_error(struct net *net, struct nf_conn *tmpl,
}
#endif
+static void udp_error_log(const struct sk_buff *skb, struct net *net,
+ u8 pf, const char *msg)
+{
+ nf_l4proto_log_invalid(skb, net, pf, IPPROTO_UDP, "%s", msg);
+}
+
static int udp_error(struct net *net, struct nf_conn *tmpl, struct sk_buff *skb,
unsigned int dataoff,
u_int8_t pf,
@@ -162,17 +166,13 @@ static int udp_error(struct net *net, struct nf_conn *tmpl, struct sk_buff *skb,
/* Header is too small? */
hdr = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
if (hdr == NULL) {
- if (LOG_INVALID(net, IPPROTO_UDP))
- nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
- "nf_ct_udp: short packet ");
+ udp_error_log(skb, net, pf, "short packet");
return -NF_ACCEPT;
}
/* Truncated/malformed packets */
if (ntohs(hdr->len) > udplen || ntohs(hdr->len) < sizeof(*hdr)) {
- if (LOG_INVALID(net, IPPROTO_UDP))
- nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
- "nf_ct_udp: truncated/malformed packet ");
+ udp_error_log(skb, net, pf, "truncated/malformed packet");
return -NF_ACCEPT;
}
@@ -186,9 +186,7 @@ static int udp_error(struct net *net, struct nf_conn *tmpl, struct sk_buff *skb,
* FIXME: Source route IP option packets --RR */
if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING &&
nf_checksum(skb, hooknum, dataoff, IPPROTO_UDP, pf)) {
- if (LOG_INVALID(net, IPPROTO_UDP))
- nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
- "nf_ct_udp: bad UDP checksum ");
+ udp_error_log(skb, net, pf, "bad checksum");
return -NF_ACCEPT;
}
--
2.11.0
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