* [PATCH nf] netfilter: nf_log: missing vlan offload tag and proto
@ 2020-10-12 20:55 Pablo Neira Ayuso
2020-10-12 20:55 ` [PATCH nf] netfilter: nftables: extend error reporting for chain updates Pablo Neira Ayuso
0 siblings, 1 reply; 2+ messages in thread
From: Pablo Neira Ayuso @ 2020-10-12 20:55 UTC (permalink / raw)
To: netfilter-devel
Dump vlan tag and proto for the usual vlan offload case if the
NF_LOG_MACDECODE flag is set on. Without this information the logging is
misleading as they is no reference to the VLAN header.
[12716.993704] test: IN=veth0 OUT= MACSRC=86:6c:92:ea:d6:73 MACDST=0e:3b:eb:86:73:76 VPROTO=8100 VID=10 MACPROTO=0800 SRC=192.168.10.2 DST=172.217.168.163 LEN=52 TOS=0x00 PREC=0x00 TTL=64 ID=2548 DF PROTO=TCP SPT=55848 DPT=80 WINDOW=501 RES=0x00 ACK FIN URGP=0
[12721.157643] test: IN=veth0 OUT= MACSRC=86:6c:92:ea:d6:73 MACDST=0e:3b:eb:86:73:76 VPROTO=8100 VID=10 MACPROTO=0806 ARP HTYPE=1 PTYPE=0x0800 OPCODE=2 MACSRC=86:6c:92:ea:d6:73 IPSRC=192.168.10.2 MACDST=0e:3b:eb:86:73:76 IPDST=192.168.10.1
Fixes: 83e96d443b37 ("netfilter: log: split family specific code to nf_log_{ip,ip6,common}.c files")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
include/net/netfilter/nf_log.h | 1 +
net/ipv4/netfilter/nf_log_arp.c | 19 +++++++++++++++++--
net/ipv4/netfilter/nf_log_ipv4.c | 6 ++++--
net/ipv6/netfilter/nf_log_ipv6.c | 8 +++++---
net/netfilter/nf_log_common.c | 12 ++++++++++++
5 files changed, 39 insertions(+), 7 deletions(-)
diff --git a/include/net/netfilter/nf_log.h b/include/net/netfilter/nf_log.h
index 0d3920896d50..716db4a0fed8 100644
--- a/include/net/netfilter/nf_log.h
+++ b/include/net/netfilter/nf_log.h
@@ -108,6 +108,7 @@ int nf_log_dump_tcp_header(struct nf_log_buf *m, const struct sk_buff *skb,
unsigned int logflags);
void nf_log_dump_sk_uid_gid(struct net *net, struct nf_log_buf *m,
struct sock *sk);
+void nf_log_dump_vlan(struct nf_log_buf *m, const struct sk_buff *skb);
void nf_log_dump_packet_common(struct nf_log_buf *m, u_int8_t pf,
unsigned int hooknum, const struct sk_buff *skb,
const struct net_device *in,
diff --git a/net/ipv4/netfilter/nf_log_arp.c b/net/ipv4/netfilter/nf_log_arp.c
index 7a83f881efa9..136030ad2e54 100644
--- a/net/ipv4/netfilter/nf_log_arp.c
+++ b/net/ipv4/netfilter/nf_log_arp.c
@@ -43,16 +43,31 @@ static void dump_arp_packet(struct nf_log_buf *m,
const struct nf_loginfo *info,
const struct sk_buff *skb, unsigned int nhoff)
{
- const struct arphdr *ah;
- struct arphdr _arph;
const struct arppayload *ap;
struct arppayload _arpp;
+ const struct arphdr *ah;
+ unsigned int logflags;
+ struct arphdr _arph;
ah = skb_header_pointer(skb, 0, sizeof(_arph), &_arph);
if (ah == NULL) {
nf_log_buf_add(m, "TRUNCATED");
return;
}
+
+ if (info->type == NF_LOG_TYPE_LOG)
+ logflags = info->u.log.logflags;
+ else
+ logflags = NF_LOG_DEFAULT_MASK;
+
+ if (logflags & NF_LOG_MACDECODE) {
+ nf_log_buf_add(m, "MACSRC=%pM MACDST=%pM ",
+ eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest);
+ nf_log_dump_vlan(m, skb);
+ nf_log_buf_add(m, "MACPROTO=%04x ",
+ ntohs(eth_hdr(skb)->h_proto));
+ }
+
nf_log_buf_add(m, "ARP HTYPE=%d PTYPE=0x%04x OPCODE=%d",
ntohs(ah->ar_hrd), ntohs(ah->ar_pro), ntohs(ah->ar_op));
diff --git a/net/ipv4/netfilter/nf_log_ipv4.c b/net/ipv4/netfilter/nf_log_ipv4.c
index 0c72156130b6..d07583fac8f8 100644
--- a/net/ipv4/netfilter/nf_log_ipv4.c
+++ b/net/ipv4/netfilter/nf_log_ipv4.c
@@ -284,8 +284,10 @@ static void dump_ipv4_mac_header(struct nf_log_buf *m,
switch (dev->type) {
case ARPHRD_ETHER:
- nf_log_buf_add(m, "MACSRC=%pM MACDST=%pM MACPROTO=%04x ",
- eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
+ nf_log_buf_add(m, "MACSRC=%pM MACDST=%pM ",
+ eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest);
+ nf_log_dump_vlan(m, skb);
+ nf_log_buf_add(m, "MACPROTO=%04x ",
ntohs(eth_hdr(skb)->h_proto));
return;
default:
diff --git a/net/ipv6/netfilter/nf_log_ipv6.c b/net/ipv6/netfilter/nf_log_ipv6.c
index da64550a5707..8210ff34ed9b 100644
--- a/net/ipv6/netfilter/nf_log_ipv6.c
+++ b/net/ipv6/netfilter/nf_log_ipv6.c
@@ -297,9 +297,11 @@ static void dump_ipv6_mac_header(struct nf_log_buf *m,
switch (dev->type) {
case ARPHRD_ETHER:
- nf_log_buf_add(m, "MACSRC=%pM MACDST=%pM MACPROTO=%04x ",
- eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest,
- ntohs(eth_hdr(skb)->h_proto));
+ nf_log_buf_add(m, "MACSRC=%pM MACDST=%pM ",
+ eth_hdr(skb)->h_source, eth_hdr(skb)->h_dest);
+ nf_log_dump_vlan(m, skb);
+ nf_log_buf_add(m, "MACPROTO=%04x ",
+ ntohs(eth_hdr(skb)->h_proto));
return;
default:
break;
diff --git a/net/netfilter/nf_log_common.c b/net/netfilter/nf_log_common.c
index ae5628ddbe6d..fd7c5f0f5c25 100644
--- a/net/netfilter/nf_log_common.c
+++ b/net/netfilter/nf_log_common.c
@@ -171,6 +171,18 @@ nf_log_dump_packet_common(struct nf_log_buf *m, u_int8_t pf,
}
EXPORT_SYMBOL_GPL(nf_log_dump_packet_common);
+void nf_log_dump_vlan(struct nf_log_buf *m, const struct sk_buff *skb)
+{
+ u16 vid;
+
+ if (!skb_vlan_tag_present(skb))
+ return;
+
+ vid = skb_vlan_tag_get(skb);
+ nf_log_buf_add(m, "VPROTO=%04x VID=%u ", ntohs(skb->vlan_proto), vid);
+}
+EXPORT_SYMBOL_GPL(nf_log_dump_vlan);
+
/* bridge and netdev logging families share this code. */
void nf_log_l2packet(struct net *net, u_int8_t pf,
__be16 protocol,
--
2.20.1
^ permalink raw reply related [flat|nested] 2+ messages in thread* [PATCH nf] netfilter: nftables: extend error reporting for chain updates
2020-10-12 20:55 [PATCH nf] netfilter: nf_log: missing vlan offload tag and proto Pablo Neira Ayuso
@ 2020-10-12 20:55 ` Pablo Neira Ayuso
0 siblings, 0 replies; 2+ messages in thread
From: Pablo Neira Ayuso @ 2020-10-12 20:55 UTC (permalink / raw)
To: netfilter-devel
The initial support for netlink extended ACK is missing the chain update
path, which results in misleading error reporting in case of EEXIST.
Fixes 36dd1bcc07e5 ("netfilter: nf_tables: initial support for extended ACK reporting")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
net/netfilter/nf_tables_api.c | 19 ++++++++++++++-----
1 file changed, 14 insertions(+), 5 deletions(-)
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 4603b667973a..0e43063767d6 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -2103,7 +2103,8 @@ static bool nft_hook_list_equal(struct list_head *hook_list1,
}
static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
- u32 flags)
+ u32 flags, const struct nlattr *attr,
+ struct netlink_ext_ack *extack)
{
const struct nlattr * const *nla = ctx->nla;
struct nft_table *table = ctx->table;
@@ -2119,9 +2120,10 @@ static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
return -EOPNOTSUPP;
if (nla[NFTA_CHAIN_HOOK]) {
- if (!nft_is_base_chain(chain))
+ if (!nft_is_base_chain(chain)) {
+ NL_SET_BAD_ATTR(extack, attr);
return -EEXIST;
-
+ }
err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
false);
if (err < 0)
@@ -2130,6 +2132,7 @@ static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
basechain = nft_base_chain(chain);
if (basechain->type != hook.type) {
nft_chain_release_hook(&hook);
+ NL_SET_BAD_ATTR(extack, attr);
return -EEXIST;
}
@@ -2137,6 +2140,7 @@ static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
if (!nft_hook_list_equal(&basechain->hook_list,
&hook.list)) {
nft_chain_release_hook(&hook);
+ NL_SET_BAD_ATTR(extack, attr);
return -EEXIST;
}
} else {
@@ -2144,6 +2148,7 @@ static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
if (ops->hooknum != hook.num ||
ops->priority != hook.priority) {
nft_chain_release_hook(&hook);
+ NL_SET_BAD_ATTR(extack, attr);
return -EEXIST;
}
}
@@ -2156,8 +2161,10 @@ static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
chain2 = nft_chain_lookup(ctx->net, table,
nla[NFTA_CHAIN_NAME], genmask);
- if (!IS_ERR(chain2))
+ if (!IS_ERR(chain2)) {
+ NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
return -EEXIST;
+ }
}
if (nla[NFTA_CHAIN_COUNTERS]) {
@@ -2200,6 +2207,7 @@ static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
nft_trans_chain_update(tmp) &&
nft_trans_chain_name(tmp) &&
strcmp(name, nft_trans_chain_name(tmp)) == 0) {
+ NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
kfree(name);
goto err;
}
@@ -2322,7 +2330,8 @@ static int nf_tables_newchain(struct net *net, struct sock *nlsk,
return -EOPNOTSUPP;
flags |= chain->flags & NFT_CHAIN_BASE;
- return nf_tables_updchain(&ctx, genmask, policy, flags);
+ return nf_tables_updchain(&ctx, genmask, policy, flags, attr,
+ extack);
}
return nf_tables_addchain(&ctx, family, genmask, policy, flags);
--
2.20.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
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