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-rw-r--r--net/ipv4/netfilter/ip_conntrack_proto_icmp.c23
-rw-r--r--net/ipv4/netfilter/ip_conntrack_proto_tcp.c7
-rw-r--r--net/ipv4/netfilter/ip_conntrack_proto_udp.c7
-rw-r--r--net/ipv4/netfilter/ipt_REJECT.c9
-rw-r--r--net/ipv4/netfilter/nf_conntrack_proto_icmp.c20
-rw-r--r--net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c12
-rw-r--r--net/netfilter/nf_conntrack_proto_tcp.c50
-rw-r--r--net/netfilter/nf_conntrack_proto_udp.c50
8 files changed, 25 insertions, 153 deletions
diff --git a/net/ipv4/netfilter/ip_conntrack_proto_icmp.c b/net/ipv4/netfilter/ip_conntrack_proto_icmp.c
index 3021af0910f1..d8b14a9010a6 100644
--- a/net/ipv4/netfilter/ip_conntrack_proto_icmp.c
+++ b/net/ipv4/netfilter/ip_conntrack_proto_icmp.c
@@ -224,25 +224,14 @@ icmp_error(struct sk_buff *skb, enum ip_conntrack_info *ctinfo,
}
/* See ip_conntrack_proto_tcp.c */
- if (hooknum != NF_IP_PRE_ROUTING)
- goto checksum_skipped;
-
- switch (skb->ip_summed) {
- case CHECKSUM_HW:
- if (!(u16)csum_fold(skb->csum))
- break;
- /* fall through */
- case CHECKSUM_NONE:
- skb->csum = 0;
- if (__skb_checksum_complete(skb)) {
- if (LOG_INVALID(IPPROTO_ICMP))
- nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
- "ip_ct_icmp: bad ICMP checksum ");
- return -NF_ACCEPT;
- }
+ if (hooknum == NF_IP_PRE_ROUTING &&
+ nf_ip_checksum(skb, hooknum, skb->nh.iph->ihl * 4, 0)) {
+ if (LOG_INVALID(IPPROTO_ICMP))
+ nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
+ "ip_ct_icmp: bad ICMP checksum ");
+ return -NF_ACCEPT;
}
-checksum_skipped:
/*
* 18 is the highest 'known' ICMP type. Anything else is a mystery
*
diff --git a/net/ipv4/netfilter/ip_conntrack_proto_tcp.c b/net/ipv4/netfilter/ip_conntrack_proto_tcp.c
index e0dc37063545..062b252b58ad 100644
--- a/net/ipv4/netfilter/ip_conntrack_proto_tcp.c
+++ b/net/ipv4/netfilter/ip_conntrack_proto_tcp.c
@@ -870,11 +870,8 @@ static int tcp_error(struct sk_buff *skb,
* and moreover root might send raw packets.
*/
/* FIXME: Source route IP option packets --RR */
- if (hooknum == NF_IP_PRE_ROUTING
- && skb->ip_summed != CHECKSUM_UNNECESSARY
- && csum_tcpudp_magic(iph->saddr, iph->daddr, tcplen, IPPROTO_TCP,
- skb->ip_summed == CHECKSUM_HW ? skb->csum
- : skb_checksum(skb, iph->ihl*4, tcplen, 0))) {
+ if (hooknum == NF_IP_PRE_ROUTING &&
+ nf_ip_checksum(skb, hooknum, iph->ihl * 4, IPPROTO_TCP)) {
if (LOG_INVALID(IPPROTO_TCP))
nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
"ip_ct_tcp: bad TCP checksum ");
diff --git a/net/ipv4/netfilter/ip_conntrack_proto_udp.c b/net/ipv4/netfilter/ip_conntrack_proto_udp.c
index 55b7d3210adf..70899868783b 100644
--- a/net/ipv4/netfilter/ip_conntrack_proto_udp.c
+++ b/net/ipv4/netfilter/ip_conntrack_proto_udp.c
@@ -120,11 +120,8 @@ static int udp_error(struct sk_buff *skb, enum ip_conntrack_info *ctinfo,
* because the semantic of CHECKSUM_HW is different there
* and moreover root might send raw packets.
* FIXME: Source route IP option packets --RR */
- if (hooknum == NF_IP_PRE_ROUTING
- && skb->ip_summed != CHECKSUM_UNNECESSARY
- && csum_tcpudp_magic(iph->saddr, iph->daddr, udplen, IPPROTO_UDP,
- skb->ip_summed == CHECKSUM_HW ? skb->csum
- : skb_checksum(skb, iph->ihl*4, udplen, 0))) {
+ if (hooknum == NF_IP_PRE_ROUTING &&
+ nf_ip_checksum(skb, hooknum, iph->ihl * 4, IPPROTO_UDP)) {
if (LOG_INVALID(IPPROTO_UDP))
nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
"ip_ct_udp: bad UDP checksum ");
diff --git a/net/ipv4/netfilter/ipt_REJECT.c b/net/ipv4/netfilter/ipt_REJECT.c
index 4269a5440d43..0bba3c2bb786 100644
--- a/net/ipv4/netfilter/ipt_REJECT.c
+++ b/net/ipv4/netfilter/ipt_REJECT.c
@@ -106,7 +106,6 @@ static void send_reset(struct sk_buff *oldskb, int hook)
struct rtable *rt;
u_int16_t tmp_port;
u_int32_t tmp_addr;
- unsigned int tcplen;
int needs_ack;
int hh_len;
@@ -124,13 +123,7 @@ static void send_reset(struct sk_buff *oldskb, int hook)
return;
/* Check checksum */
- tcplen = oldskb->len - iph->ihl * 4;
- if (((hook != NF_IP_LOCAL_IN && oldskb->ip_summed != CHECKSUM_HW) ||
- (hook == NF_IP_LOCAL_IN &&
- oldskb->ip_summed != CHECKSUM_UNNECESSARY)) &&
- csum_tcpudp_magic(iph->saddr, iph->daddr, tcplen, IPPROTO_TCP,
- oldskb->ip_summed == CHECKSUM_HW ? oldskb->csum :
- skb_checksum(oldskb, iph->ihl * 4, tcplen, 0)))
+ if (nf_ip_checksum(oldskb, hook, iph->ihl * 4, IPPROTO_TCP))
return;
if ((rt = route_reverse(oldskb, oth, hook)) == NULL)
diff --git a/net/ipv4/netfilter/nf_conntrack_proto_icmp.c b/net/ipv4/netfilter/nf_conntrack_proto_icmp.c
index 52dc175be39a..4b0d361cc6e6 100644
--- a/net/ipv4/netfilter/nf_conntrack_proto_icmp.c
+++ b/net/ipv4/netfilter/nf_conntrack_proto_icmp.c
@@ -235,30 +235,14 @@ icmp_error(struct sk_buff *skb, unsigned int dataoff,
}
/* See ip_conntrack_proto_tcp.c */
- if (hooknum != NF_IP_PRE_ROUTING)
- goto checksum_skipped;
-
- switch (skb->ip_summed) {
- case CHECKSUM_HW:
- if (!(u16)csum_fold(skb->csum))
- break;
+ if (hooknum == NF_IP_PRE_ROUTING &&
+ nf_ip_checksum(skb, hooknum, dataoff, 0)) {
if (LOG_INVALID(IPPROTO_ICMP))
nf_log_packet(PF_INET, 0, skb, NULL, NULL, NULL,
"nf_ct_icmp: bad HW ICMP checksum ");
return -NF_ACCEPT;
- case CHECKSUM_NONE:
- if ((u16)csum_fold(skb_checksum(skb, 0, skb->len, 0))) {
- if (LOG_INVALID(IPPROTO_ICMP))
- nf_log_packet(PF_INET, 0, skb, NULL, NULL,
- NULL,
- "nf_ct_icmp: bad ICMP checksum ");
- return -NF_ACCEPT;
- }
- default:
- break;
}
-checksum_skipped:
/*
* 18 is the highest 'known' ICMP type. Anything else is a mystery
*
diff --git a/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c b/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c
index 09945c333055..86c6703265d0 100644
--- a/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c
+++ b/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c
@@ -233,21 +233,13 @@ icmpv6_error(struct sk_buff *skb, unsigned int dataoff,
return -NF_ACCEPT;
}
- if (hooknum != NF_IP6_PRE_ROUTING)
- goto skipped;
-
- /* Ignore it if the checksum's bogus. */
- if (csum_ipv6_magic(&skb->nh.ipv6h->saddr, &skb->nh.ipv6h->daddr,
- skb->len - dataoff, IPPROTO_ICMPV6,
- skb_checksum(skb, dataoff,
- skb->len - dataoff, 0))) {
+ if (hooknum == NF_IP6_PRE_ROUTING &&
+ nf_ip6_checksum(skb, hooknum, dataoff, IPPROTO_ICMPV6)) {
nf_log_packet(PF_INET6, 0, skb, NULL, NULL, NULL,
"nf_ct_icmpv6: ICMPv6 checksum failed\n");
return -NF_ACCEPT;
}
-skipped:
-
/* is not error message ? */
if (icmp6h->icmp6_type >= 128)
return NF_ACCEPT;
diff --git a/net/netfilter/nf_conntrack_proto_tcp.c b/net/netfilter/nf_conntrack_proto_tcp.c
index 6492ed66fb3c..69899f27d26a 100644
--- a/net/netfilter/nf_conntrack_proto_tcp.c
+++ b/net/netfilter/nf_conntrack_proto_tcp.c
@@ -799,8 +799,7 @@ static int tcp_error(struct sk_buff *skb,
unsigned int dataoff,
enum ip_conntrack_info *ctinfo,
int pf,
- unsigned int hooknum,
- int(*csum)(const struct sk_buff *,unsigned int))
+ unsigned int hooknum)
{
struct tcphdr _tcph, *th;
unsigned int tcplen = skb->len - dataoff;
@@ -830,9 +829,8 @@ static int tcp_error(struct sk_buff *skb,
*/
/* FIXME: Source route IP option packets --RR */
if (((pf == PF_INET && hooknum == NF_IP_PRE_ROUTING) ||
- (pf == PF_INET6 && hooknum == NF_IP6_PRE_ROUTING))
- && skb->ip_summed != CHECKSUM_UNNECESSARY
- && csum(skb, dataoff)) {
+ (pf == PF_INET6 && hooknum == NF_IP6_PRE_ROUTING)) &&
+ nf_checksum(skb, hooknum, dataoff, IPPROTO_TCP, pf)) {
if (LOG_INVALID(IPPROTO_TCP))
nf_log_packet(pf, 0, skb, NULL, NULL, NULL,
"nf_ct_tcp: bad TCP checksum ");
@@ -851,44 +849,6 @@ static int tcp_error(struct sk_buff *skb,
return NF_ACCEPT;
}
-static int csum4(const struct sk_buff *skb, unsigned int dataoff)
-{
- return csum_tcpudp_magic(skb->nh.iph->saddr, skb->nh.iph->daddr,
- skb->len - dataoff, IPPROTO_TCP,
- skb->ip_summed == CHECKSUM_HW ? skb->csum
- : skb_checksum(skb, dataoff,
- skb->len - dataoff, 0));
-}
-
-static int csum6(const struct sk_buff *skb, unsigned int dataoff)
-{
- return csum_ipv6_magic(&skb->nh.ipv6h->saddr, &skb->nh.ipv6h->daddr,
- skb->len - dataoff, IPPROTO_TCP,
- skb->ip_summed == CHECKSUM_HW
- ? csum_sub(skb->csum,
- skb_checksum(skb, 0, dataoff, 0))
- : skb_checksum(skb, dataoff, skb->len - dataoff,
- 0));
-}
-
-static int tcp_error4(struct sk_buff *skb,
- unsigned int dataoff,
- enum ip_conntrack_info *ctinfo,
- int pf,
- unsigned int hooknum)
-{
- return tcp_error(skb, dataoff, ctinfo, pf, hooknum, csum4);
-}
-
-static int tcp_error6(struct sk_buff *skb,
- unsigned int dataoff,
- enum ip_conntrack_info *ctinfo,
- int pf,
- unsigned int hooknum)
-{
- return tcp_error(skb, dataoff, ctinfo, pf, hooknum, csum6);
-}
-
/* Returns verdict for packet, or -1 for invalid. */
static int tcp_packet(struct nf_conn *conntrack,
const struct sk_buff *skb,
@@ -1218,7 +1178,7 @@ struct nf_conntrack_protocol nf_conntrack_protocol_tcp4 =
.print_conntrack = tcp_print_conntrack,
.packet = tcp_packet,
.new = tcp_new,
- .error = tcp_error4,
+ .error = tcp_error,
#if defined(CONFIG_NF_CT_NETLINK) || \
defined(CONFIG_NF_CT_NETLINK_MODULE)
.to_nfattr = tcp_to_nfattr,
@@ -1239,7 +1199,7 @@ struct nf_conntrack_protocol nf_conntrack_protocol_tcp6 =
.print_conntrack = tcp_print_conntrack,
.packet = tcp_packet,
.new = tcp_new,
- .error = tcp_error6,
+ .error = tcp_error,
#if defined(CONFIG_NF_CT_NETLINK) || \
defined(CONFIG_NF_CT_NETLINK_MODULE)
.to_nfattr = tcp_to_nfattr,
diff --git a/net/netfilter/nf_conntrack_proto_udp.c b/net/netfilter/nf_conntrack_proto_udp.c
index 831d206344e0..d93edbfde9e3 100644
--- a/net/netfilter/nf_conntrack_proto_udp.c
+++ b/net/netfilter/nf_conntrack_proto_udp.c
@@ -103,8 +103,7 @@ static int udp_new(struct nf_conn *conntrack, const struct sk_buff *skb,
static int udp_error(struct sk_buff *skb, unsigned int dataoff,
enum ip_conntrack_info *ctinfo,
int pf,
- unsigned int hooknum,
- int (*csum)(const struct sk_buff *, unsigned int))
+ unsigned int hooknum)
{
unsigned int udplen = skb->len - dataoff;
struct udphdr _hdr, *hdr;
@@ -136,9 +135,8 @@ static int udp_error(struct sk_buff *skb, unsigned int dataoff,
* and moreover root might send raw packets.
* FIXME: Source route IP option packets --RR */
if (((pf == PF_INET && hooknum == NF_IP_PRE_ROUTING) ||
- (pf == PF_INET6 && hooknum == NF_IP6_PRE_ROUTING))
- && skb->ip_summed != CHECKSUM_UNNECESSARY
- && csum(skb, dataoff)) {
+ (pf == PF_INET6 && hooknum == NF_IP6_PRE_ROUTING)) &&
+ nf_checksum(skb, hooknum, dataoff, IPPROTO_UDP, pf)) {
if (LOG_INVALID(IPPROTO_UDP))
nf_log_packet(pf, 0, skb, NULL, NULL, NULL,
"nf_ct_udp: bad UDP checksum ");
@@ -148,44 +146,6 @@ static int udp_error(struct sk_buff *skb, unsigned int dataoff,
return NF_ACCEPT;
}
-static int csum4(const struct sk_buff *skb, unsigned int dataoff)
-{
- return csum_tcpudp_magic(skb->nh.iph->saddr, skb->nh.iph->daddr,
- skb->len - dataoff, IPPROTO_UDP,
- skb->ip_summed == CHECKSUM_HW ? skb->csum
- : skb_checksum(skb, dataoff,
- skb->len - dataoff, 0));
-}
-
-static int csum6(const struct sk_buff *skb, unsigned int dataoff)
-{
- return csum_ipv6_magic(&skb->nh.ipv6h->saddr, &skb->nh.ipv6h->daddr,
- skb->len - dataoff, IPPROTO_UDP,
- skb->ip_summed == CHECKSUM_HW
- ? csum_sub(skb->csum,
- skb_checksum(skb, 0, dataoff, 0))
- : skb_checksum(skb, dataoff, skb->len - dataoff,
- 0));
-}
-
-static int udp_error4(struct sk_buff *skb,
- unsigned int dataoff,
- enum ip_conntrack_info *ctinfo,
- int pf,
- unsigned int hooknum)
-{
- return udp_error(skb, dataoff, ctinfo, pf, hooknum, csum4);
-}
-
-static int udp_error6(struct sk_buff *skb,
- unsigned int dataoff,
- enum ip_conntrack_info *ctinfo,
- int pf,
- unsigned int hooknum)
-{
- return udp_error(skb, dataoff, ctinfo, pf, hooknum, csum6);
-}
-
struct nf_conntrack_protocol nf_conntrack_protocol_udp4 =
{
.l3proto = PF_INET,
@@ -197,7 +157,7 @@ struct nf_conntrack_protocol nf_conntrack_protocol_udp4 =
.print_conntrack = udp_print_conntrack,
.packet = udp_packet,
.new = udp_new,
- .error = udp_error4,
+ .error = udp_error,
#if defined(CONFIG_NF_CT_NETLINK) || \
defined(CONFIG_NF_CT_NETLINK_MODULE)
.tuple_to_nfattr = nf_ct_port_tuple_to_nfattr,
@@ -216,7 +176,7 @@ struct nf_conntrack_protocol nf_conntrack_protocol_udp6 =
.print_conntrack = udp_print_conntrack,
.packet = udp_packet,
.new = udp_new,
- .error = udp_error6,
+ .error = udp_error,
#if defined(CONFIG_NF_CT_NETLINK) || \
defined(CONFIG_NF_CT_NETLINK_MODULE)
.tuple_to_nfattr = nf_ct_port_tuple_to_nfattr,
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.