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netfilter: conntrack: merge ipv4+ipv6 confirm functions 

No need to have distinct functions.  After merge, ipv6 can avoid
protooff computation if the connection neither needs sequence adjustment
nor helper invocation -- this is the normal case.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2022-11-09 12:21:58 +01:00 committed by Pablo Neira Ayuso
parent bff3d05348
commit a70e483460
3 changed files with 63 additions and 108 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/net/netfilter/nf_conntrack_core.h
View File

@ -71,8 +71,7 @@ static inline int nf_conntrack_confirm(struct sk_buff *skb)
return ret;
}
unsigned int nf_confirm(struct sk_buff *skb, unsigned int protoff,
struct nf_conn *ct, enum ip_conntrack_info ctinfo);
unsigned int nf_confirm(void *priv, struct sk_buff *skb, const struct nf_hook_state *state);
void print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
const struct nf_conntrack_l4proto *proto);

32
net/bridge/netfilter/nf_conntrack_bridge.c
View File

@ -366,42 +366,12 @@ static int nf_ct_bridge_refrag_post(struct net *net, struct sock *sk,
return br_dev_queue_push_xmit(net, sk, skb);
}
static unsigned int nf_ct_bridge_confirm(struct sk_buff *skb)
{
enum ip_conntrack_info ctinfo;
struct nf_conn *ct;
int protoff;
ct = nf_ct_get(skb, &ctinfo);
if (!ct || ctinfo == IP_CT_RELATED_REPLY)
return nf_conntrack_confirm(skb);
switch (skb->protocol) {
case htons(ETH_P_IP):
protoff = skb_network_offset(skb) + ip_hdrlen(skb);
break;
case htons(ETH_P_IPV6): {
unsigned char pnum = ipv6_hdr(skb)->nexthdr;
__be16 frag_off;
protoff = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &pnum,
&frag_off);
if (protoff < 0 || (frag_off & htons(~0x7)) != 0)
return nf_conntrack_confirm(skb);
}
break;
default:
return NF_ACCEPT;
}
return nf_confirm(skb, protoff, ct, ctinfo);
}
static unsigned int nf_ct_bridge_post(void *priv, struct sk_buff *skb,
const struct nf_hook_state *state)
{
int ret;
ret = nf_ct_bridge_confirm(skb);
ret = nf_confirm(priv, skb, state);
if (ret != NF_ACCEPT)
return ret;

136
net/netfilter/nf_conntrack_proto.c
View File

@ -121,40 +121,6 @@ const struct nf_conntrack_l4proto *nf_ct_l4proto_find(u8 l4proto)
};
EXPORT_SYMBOL_GPL(nf_ct_l4proto_find);
unsigned int nf_confirm(struct sk_buff *skb, unsigned int protoff,
struct nf_conn *ct, enum ip_conntrack_info ctinfo)
{
const struct nf_conn_help *help;
help = nfct_help(ct);
if (help) {
const struct nf_conntrack_helper *helper;
int ret;
/* rcu_read_lock()ed by nf_hook_thresh */
helper = rcu_dereference(help->helper);
if (helper) {
ret = helper->help(skb,
protoff,
ct, ctinfo);
if (ret != NF_ACCEPT)
return ret;
}
}
if (test_bit(IPS_SEQ_ADJUST_BIT, &ct->status) &&
!nf_is_loopback_packet(skb)) {
if (!nf_ct_seq_adjust(skb, ct, ctinfo, protoff)) {
NF_CT_STAT_INC_ATOMIC(nf_ct_net(ct), drop);
return NF_DROP;
}
}
/* We've seen it coming out the other side: confirm it */
return nf_conntrack_confirm(skb);
}
EXPORT_SYMBOL_GPL(nf_confirm);
static bool in_vrf_postrouting(const struct nf_hook_state *state)
{
#if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
@ -165,24 +131,71 @@ static bool in_vrf_postrouting(const struct nf_hook_state *state)
return false;
}
static unsigned int ipv4_confirm(void *priv,
struct sk_buff *skb,
const struct nf_hook_state *state)
unsigned int nf_confirm(void *priv,
struct sk_buff *skb,
const struct nf_hook_state *state)
{
const struct nf_conn_help *help;
enum ip_conntrack_info ctinfo;
unsigned int protoff;
struct nf_conn *ct;
bool seqadj_needed;
__be16 frag_off;
u8 pnum;
ct = nf_ct_get(skb, &ctinfo);
if (!ct || ctinfo == IP_CT_RELATED_REPLY)
return nf_conntrack_confirm(skb);
if (in_vrf_postrouting(state))
if (!ct || in_vrf_postrouting(state))
return NF_ACCEPT;
return nf_confirm(skb,
skb_network_offset(skb) + ip_hdrlen(skb),
ct, ctinfo);
help = nfct_help(ct);
seqadj_needed = test_bit(IPS_SEQ_ADJUST_BIT, &ct->status) && !nf_is_loopback_packet(skb);
if (!help && !seqadj_needed)
return nf_conntrack_confirm(skb);
/* helper->help() do not expect ICMP packets */
if (ctinfo == IP_CT_RELATED_REPLY)
return nf_conntrack_confirm(skb);
switch (nf_ct_l3num(ct)) {
case NFPROTO_IPV4:
protoff = skb_network_offset(skb) + ip_hdrlen(skb);
break;
case NFPROTO_IPV6:
pnum = ipv6_hdr(skb)->nexthdr;
protoff = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &pnum, &frag_off);
if (protoff < 0 || (frag_off & htons(~0x7)) != 0)
return nf_conntrack_confirm(skb);
break;
default:
return nf_conntrack_confirm(skb);
}
if (help) {
const struct nf_conntrack_helper *helper;
int ret;
/* rcu_read_lock()ed by nf_hook */
helper = rcu_dereference(help->helper);
if (helper) {
ret = helper->help(skb,
protoff,
ct, ctinfo);
if (ret != NF_ACCEPT)
return ret;
}
}
if (seqadj_needed &&
!nf_ct_seq_adjust(skb, ct, ctinfo, protoff)) {
NF_CT_STAT_INC_ATOMIC(nf_ct_net(ct), drop);
return NF_DROP;
}
/* We've seen it coming out the other side: confirm it */
return nf_conntrack_confirm(skb);
}
EXPORT_SYMBOL_GPL(nf_confirm);
static unsigned int ipv4_conntrack_in(void *priv,
struct sk_buff *skb,
@ -230,13 +243,13 @@ static const struct nf_hook_ops ipv4_conntrack_ops[] = {
.priority = NF_IP_PRI_CONNTRACK,
},
{
.hook = ipv4_confirm,
.hook = nf_confirm,
.pf = NFPROTO_IPV4,
.hooknum = NF_INET_POST_ROUTING,
.priority = NF_IP_PRI_CONNTRACK_CONFIRM,
},
{
.hook = ipv4_confirm,
.hook = nf_confirm,
.pf = NFPROTO_IPV4,
.hooknum = NF_INET_LOCAL_IN,
.priority = NF_IP_PRI_CONNTRACK_CONFIRM,
@ -373,33 +386,6 @@ static struct nf_sockopt_ops so_getorigdst6 = {
.owner = THIS_MODULE,
};
static unsigned int ipv6_confirm(void *priv,
struct sk_buff *skb,
const struct nf_hook_state *state)
{
struct nf_conn *ct;
enum ip_conntrack_info ctinfo;
unsigned char pnum = ipv6_hdr(skb)->nexthdr;
__be16 frag_off;
int protoff;
ct = nf_ct_get(skb, &ctinfo);
if (!ct || ctinfo == IP_CT_RELATED_REPLY)
return nf_conntrack_confirm(skb);
if (in_vrf_postrouting(state))
return NF_ACCEPT;
protoff = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &pnum,
&frag_off);
if (protoff < 0 || (frag_off & htons(~0x7)) != 0) {
pr_debug("proto header not found\n");
return nf_conntrack_confirm(skb);
}
return nf_confirm(skb, protoff, ct, ctinfo);
}
static unsigned int ipv6_conntrack_in(void *priv,
struct sk_buff *skb,
const struct nf_hook_state *state)
@ -428,13 +414,13 @@ static const struct nf_hook_ops ipv6_conntrack_ops[] = {
.priority = NF_IP6_PRI_CONNTRACK,
},
{
.hook = ipv6_confirm,
.hook = nf_confirm,
.pf = NFPROTO_IPV6,
.hooknum = NF_INET_POST_ROUTING,
.priority = NF_IP6_PRI_LAST,
},
{
.hook = ipv6_confirm,
.hook = nf_confirm,
.pf = NFPROTO_IPV6,
.hooknum = NF_INET_LOCAL_IN,
.priority = NF_IP6_PRI_LAST - 1,