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authorPhil Sutter <phil@nwl.cc>2018-08-20 15:30:03 +0200
committerFlorian Westphal <fw@strlen.de>2018-08-21 17:57:16 +0200
commit5ee03e6df41727652e0dc6ffaef8411b8840d812 (patch)
treee459442cfb4035a6bba51db4bd7c49ea344cb14f /iptables
parent37b68b2bc903112a74545c7f4a49c89e889582a9 (diff)
xtables: Use meta l4proto for -p match
Use of payload expression to match against IPv6 nexthdr field does not work if extension headers are present. A simple example for that is matching for fragmented icmpv6 traffic. Instead, generate a 'meta l4proto' expression which works even if extension headers are present. For consistency, apply the same change to iptables-nft as well. No adjustment to reverse path required as the needed bits were added by commit 6ea7579e6fe24 ("nft: decode meta l4proto") already. Signed-off-by: Phil Sutter <phil@nwl.cc> Signed-off-by: Florian Westphal <fw@strlen.de>
Diffstat (limited to 'iptables')
-rw-r--r--iptables/nft-ipv4.c3
-rw-r--r--iptables/nft-ipv6.c3
-rw-r--r--iptables/nft-shared.c6
-rw-r--r--iptables/nft-shared.h1
4 files changed, 9 insertions, 4 deletions
diff --git a/iptables/nft-ipv4.c b/iptables/nft-ipv4.c
index 105b1341..2d1bd10e 100644
--- a/iptables/nft-ipv4.c
+++ b/iptables/nft-ipv4.c
@@ -45,8 +45,7 @@ static int nft_ipv4_add(struct nftnl_rule *r, void *data)
if (cs->fw.ip.proto != 0) {
op = nft_invflags2cmp(cs->fw.ip.invflags, XT_INV_PROTO);
- add_proto(r, offsetof(struct iphdr, protocol), 1,
- cs->fw.ip.proto, op);
+ add_l4proto(r, cs->fw.ip.proto, op);
}
if (cs->fw.ip.src.s_addr != 0) {
diff --git a/iptables/nft-ipv6.c b/iptables/nft-ipv6.c
index dd23557c..48a7cefe 100644
--- a/iptables/nft-ipv6.c
+++ b/iptables/nft-ipv6.c
@@ -44,8 +44,7 @@ static int nft_ipv6_add(struct nftnl_rule *r, void *data)
if (cs->fw6.ipv6.proto != 0) {
op = nft_invflags2cmp(cs->fw6.ipv6.invflags, XT_INV_PROTO);
- add_proto(r, offsetof(struct ip6_hdr, ip6_nxt), 1,
- cs->fw6.ipv6.proto, op);
+ add_l4proto(r, cs->fw6.ipv6.proto, op);
}
if (!IN6_IS_ADDR_UNSPECIFIED(&cs->fw6.ipv6.src)) {
diff --git a/iptables/nft-shared.c b/iptables/nft-shared.c
index b31234ee..62a57dd5 100644
--- a/iptables/nft-shared.c
+++ b/iptables/nft-shared.c
@@ -188,6 +188,12 @@ void add_proto(struct nftnl_rule *r, int offset, size_t len,
add_cmp_u8(r, proto, op);
}
+void add_l4proto(struct nftnl_rule *r, uint8_t proto, uint32_t op)
+{
+ add_meta(r, NFT_META_L4PROTO);
+ add_cmp_u8(r, proto, op);
+}
+
bool is_same_interfaces(const char *a_iniface, const char *a_outiface,
unsigned const char *a_iniface_mask,
unsigned const char *a_outiface_mask,
diff --git a/iptables/nft-shared.h b/iptables/nft-shared.h
index 80750784..59e1062a 100644
--- a/iptables/nft-shared.h
+++ b/iptables/nft-shared.h
@@ -122,6 +122,7 @@ void add_addr(struct nftnl_rule *r, int offset,
void *data, void *mask, size_t len, uint32_t op);
void add_proto(struct nftnl_rule *r, int offset, size_t len,
uint8_t proto, uint32_t op);
+void add_l4proto(struct nftnl_rule *r, uint8_t proto, uint32_t op);
void add_compat(struct nftnl_rule *r, uint32_t proto, bool inv);
bool is_same_interfaces(const char *a_iniface, const char *a_outiface,