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-rw-r--r--include/net/netfilter/nf_tables.h6
-rw-r--r--include/net/netfilter/nf_tables_ipv4.h33
-rw-r--r--include/net/netfilter/nf_tables_ipv6.h46
-rw-r--r--net/netfilter/nf_tables_api.c14
-rw-r--r--net/netfilter/nft_chain_filter.c35
5 files changed, 126 insertions, 8 deletions
diff --git a/include/net/netfilter/nf_tables.h b/include/net/netfilter/nf_tables.h
index 0bd2a081ae39..3965ce18226f 100644
--- a/include/net/netfilter/nf_tables.h
+++ b/include/net/netfilter/nf_tables.h
@@ -1081,6 +1081,12 @@ struct nft_table {
u8 *udata;
};
+static inline bool nft_base_chain_netdev(int family, u32 hooknum)
+{
+ return family == NFPROTO_NETDEV ||
+ (family == NFPROTO_INET && hooknum == NF_INET_INGRESS);
+}
+
void nft_register_chain_type(const struct nft_chain_type *);
void nft_unregister_chain_type(const struct nft_chain_type *);
diff --git a/include/net/netfilter/nf_tables_ipv4.h b/include/net/netfilter/nf_tables_ipv4.h
index ed7b511f0a59..1f7bea39ad1b 100644
--- a/include/net/netfilter/nf_tables_ipv4.h
+++ b/include/net/netfilter/nf_tables_ipv4.h
@@ -53,4 +53,37 @@ static inline void nft_set_pktinfo_ipv4_validate(struct nft_pktinfo *pkt,
nft_set_pktinfo_unspec(pkt, skb);
}
+static inline int nft_set_pktinfo_ipv4_ingress(struct nft_pktinfo *pkt,
+ struct sk_buff *skb)
+{
+ struct iphdr *iph;
+ u32 len, thoff;
+
+ if (!pskb_may_pull(skb, sizeof(*iph)))
+ return -1;
+
+ iph = ip_hdr(skb);
+ if (iph->ihl < 5 || iph->version != 4)
+ goto inhdr_error;
+
+ len = ntohs(iph->tot_len);
+ thoff = iph->ihl * 4;
+ if (skb->len < len) {
+ __IP_INC_STATS(nft_net(pkt), IPSTATS_MIB_INTRUNCATEDPKTS);
+ return -1;
+ } else if (len < thoff) {
+ goto inhdr_error;
+ }
+
+ pkt->tprot_set = true;
+ pkt->tprot = iph->protocol;
+ pkt->xt.thoff = thoff;
+ pkt->xt.fragoff = ntohs(iph->frag_off) & IP_OFFSET;
+
+ return 0;
+
+inhdr_error:
+ __IP_INC_STATS(nft_net(pkt), IPSTATS_MIB_INHDRERRORS);
+ return -1;
+}
#endif
diff --git a/include/net/netfilter/nf_tables_ipv6.h b/include/net/netfilter/nf_tables_ipv6.h
index d0f1c537b017..867de29f3f7a 100644
--- a/include/net/netfilter/nf_tables_ipv6.h
+++ b/include/net/netfilter/nf_tables_ipv6.h
@@ -70,4 +70,50 @@ static inline void nft_set_pktinfo_ipv6_validate(struct nft_pktinfo *pkt,
nft_set_pktinfo_unspec(pkt, skb);
}
+static inline int nft_set_pktinfo_ipv6_ingress(struct nft_pktinfo *pkt,
+ struct sk_buff *skb)
+{
+#if IS_ENABLED(CONFIG_IPV6)
+ unsigned int flags = IP6_FH_F_AUTH;
+ unsigned short frag_off;
+ unsigned int thoff = 0;
+ struct inet6_dev *idev;
+ struct ipv6hdr *ip6h;
+ int protohdr;
+ u32 pkt_len;
+
+ if (!pskb_may_pull(skb, sizeof(*ip6h)))
+ return -1;
+
+ ip6h = ipv6_hdr(skb);
+ if (ip6h->version != 6)
+ goto inhdr_error;
+
+ pkt_len = ntohs(ip6h->payload_len);
+ if (pkt_len + sizeof(*ip6h) > skb->len) {
+ idev = __in6_dev_get(nft_in(pkt));
+ __IP6_INC_STATS(nft_net(pkt), idev, IPSTATS_MIB_INTRUNCATEDPKTS);
+ return -1;
+ }
+
+ protohdr = ipv6_find_hdr(pkt->skb, &thoff, -1, &frag_off, &flags);
+ if (protohdr < 0)
+ goto inhdr_error;
+
+ pkt->tprot_set = true;
+ pkt->tprot = protohdr;
+ pkt->xt.thoff = thoff;
+ pkt->xt.fragoff = frag_off;
+
+ return 0;
+
+inhdr_error:
+ idev = __in6_dev_get(nft_in(pkt));
+ __IP6_INC_STATS(nft_net(pkt), idev, IPSTATS_MIB_INHDRERRORS);
+ return -1;
+#else
+ return -1;
+#endif
+}
+
#endif
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index ae2c04d411b1..f22ad21d0230 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -206,7 +206,7 @@ static int nf_tables_register_hook(struct net *net,
if (basechain->type->ops_register)
return basechain->type->ops_register(net, ops);
- if (table->family == NFPROTO_NETDEV)
+ if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
return nft_netdev_register_hooks(net, &basechain->hook_list);
return nf_register_net_hook(net, &basechain->ops);
@@ -228,7 +228,7 @@ static void nf_tables_unregister_hook(struct net *net,
if (basechain->type->ops_unregister)
return basechain->type->ops_unregister(net, ops);
- if (table->family == NFPROTO_NETDEV)
+ if (nft_base_chain_netdev(table->family, basechain->ops.hooknum))
nft_netdev_unregister_hooks(net, &basechain->hook_list);
else
nf_unregister_net_hook(net, &basechain->ops);
@@ -1381,7 +1381,7 @@ static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
if (nla_put_be32(skb, NFTA_HOOK_PRIORITY, htonl(ops->priority)))
goto nla_put_failure;
- if (family == NFPROTO_NETDEV) {
+ if (nft_base_chain_netdev(family, ops->hooknum)) {
nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
list_for_each_entry(hook, &basechain->hook_list, list) {
if (!first)
@@ -1685,7 +1685,7 @@ void nf_tables_chain_destroy(struct nft_ctx *ctx)
if (nft_is_base_chain(chain)) {
struct nft_base_chain *basechain = nft_base_chain(chain);
- if (ctx->family == NFPROTO_NETDEV) {
+ if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
list_for_each_entry_safe(hook, next,
&basechain->hook_list, list) {
list_del_rcu(&hook->list);
@@ -1877,7 +1877,7 @@ static int nft_chain_parse_hook(struct net *net,
hook->type = type;
INIT_LIST_HEAD(&hook->list);
- if (family == NFPROTO_NETDEV) {
+ if (nft_base_chain_netdev(family, hook->num)) {
err = nft_chain_parse_netdev(net, ha, &hook->list);
if (err < 0) {
module_put(type->owner);
@@ -1944,7 +1944,7 @@ static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
INIT_LIST_HEAD(&basechain->hook_list);
chain = &basechain->chain;
- if (family == NFPROTO_NETDEV) {
+ if (nft_base_chain_netdev(family, hook->num)) {
list_splice_init(&hook->list, &basechain->hook_list);
list_for_each_entry(h, &basechain->hook_list, list)
nft_basechain_hook_init(&h->ops, family, hook, chain);
@@ -2168,7 +2168,7 @@ static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
return -EEXIST;
}
- if (ctx->family == NFPROTO_NETDEV) {
+ if (nft_base_chain_netdev(ctx->family, hook.num)) {
if (!nft_hook_list_equal(&basechain->hook_list,
&hook.list)) {
nft_chain_release_hook(&hook);
diff --git a/net/netfilter/nft_chain_filter.c b/net/netfilter/nft_chain_filter.c
index c78d01bc02e9..ff8528ad3dc6 100644
--- a/net/netfilter/nft_chain_filter.c
+++ b/net/netfilter/nft_chain_filter.c
@@ -161,16 +161,49 @@ static unsigned int nft_do_chain_inet(void *priv, struct sk_buff *skb,
return nft_do_chain(&pkt, priv);
}
+static unsigned int nft_do_chain_inet_ingress(void *priv, struct sk_buff *skb,
+ const struct nf_hook_state *state)
+{
+ struct nf_hook_state ingress_state = *state;
+ struct nft_pktinfo pkt;
+
+ switch (skb->protocol) {
+ case htons(ETH_P_IP):
+ /* Original hook is NFPROTO_NETDEV and NF_NETDEV_INGRESS. */
+ ingress_state.pf = NFPROTO_IPV4;
+ ingress_state.hook = NF_INET_INGRESS;
+ nft_set_pktinfo(&pkt, skb, &ingress_state);
+
+ if (nft_set_pktinfo_ipv4_ingress(&pkt, skb) < 0)
+ return NF_DROP;
+ break;
+ case htons(ETH_P_IPV6):
+ ingress_state.pf = NFPROTO_IPV6;
+ ingress_state.hook = NF_INET_INGRESS;
+ nft_set_pktinfo(&pkt, skb, &ingress_state);
+
+ if (nft_set_pktinfo_ipv6_ingress(&pkt, skb) < 0)
+ return NF_DROP;
+ break;
+ default:
+ return NF_ACCEPT;
+ }
+
+ return nft_do_chain(&pkt, priv);
+}
+
static const struct nft_chain_type nft_chain_filter_inet = {
.name = "filter",
.type = NFT_CHAIN_T_DEFAULT,
.family = NFPROTO_INET,
- .hook_mask = (1 << NF_INET_LOCAL_IN) |
+ .hook_mask = (1 << NF_INET_INGRESS) |
+ (1 << NF_INET_LOCAL_IN) |
(1 << NF_INET_LOCAL_OUT) |
(1 << NF_INET_FORWARD) |
(1 << NF_INET_PRE_ROUTING) |
(1 << NF_INET_POST_ROUTING),
.hooks = {
+ [NF_INET_INGRESS] = nft_do_chain_inet_ingress,
[NF_INET_LOCAL_IN] = nft_do_chain_inet,
[NF_INET_LOCAL_OUT] = nft_do_chain_inet,
[NF_INET_FORWARD] = nft_do_chain_inet,
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.