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netfilter: nat: fold in_range indirection into caller 

No need for indirections here, we only support ipv4 and ipv6
and the called functions are very small.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2018-12-13 16:01:30 +01:00 committed by Pablo Neira Ayuso
parent 203f2e7820
commit 40e786bd29
4 changed files with 16 additions and 26 deletions
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3
include/net/netfilter/nf_nat_l3proto.h
View File

@ -6,9 +6,6 @@ struct nf_nat_l4proto;
struct nf_nat_l3proto {
u8 l3proto;
bool (*in_range)(const struct nf_conntrack_tuple *t,
const struct nf_nat_range2 *range);
bool (*manip_pkt)(struct sk_buff *skb,
unsigned int iphdroff,
const struct nf_nat_l4proto *l4proto,

8
net/ipv4/netfilter/nf_nat_l3proto_ipv4.c
View File

@ -62,13 +62,6 @@ static void nf_nat_ipv4_decode_session(struct sk_buff *skb,
}
#endif /* CONFIG_XFRM */
static bool nf_nat_ipv4_in_range(const struct nf_conntrack_tuple *t,
const struct nf_nat_range2 *range)
{
return ntohl(t->src.u3.ip) >= ntohl(range->min_addr.ip) &&
ntohl(t->src.u3.ip) <= ntohl(range->max_addr.ip);
}
static bool nf_nat_ipv4_manip_pkt(struct sk_buff *skb,
unsigned int iphdroff,
const struct nf_nat_l4proto *l4proto,
@ -155,7 +148,6 @@ static int nf_nat_ipv4_nlattr_to_range(struct nlattr *tb[],
static const struct nf_nat_l3proto nf_nat_l3proto_ipv4 = {
.l3proto = NFPROTO_IPV4,
.in_range = nf_nat_ipv4_in_range,
.manip_pkt = nf_nat_ipv4_manip_pkt,
.csum_update = nf_nat_ipv4_csum_update,
.csum_recalc = nf_nat_ipv4_csum_recalc,

8
net/ipv6/netfilter/nf_nat_l3proto_ipv6.c
View File

@ -61,13 +61,6 @@ static void nf_nat_ipv6_decode_session(struct sk_buff *skb,
}
#endif
static bool nf_nat_ipv6_in_range(const struct nf_conntrack_tuple *t,
const struct nf_nat_range2 *range)
{
return ipv6_addr_cmp(&t->src.u3.in6, &range->min_addr.in6) >= 0 &&
ipv6_addr_cmp(&t->src.u3.in6, &range->max_addr.in6) <= 0;
}
static bool nf_nat_ipv6_manip_pkt(struct sk_buff *skb,
unsigned int iphdroff,
const struct nf_nat_l4proto *l4proto,
@ -165,7 +158,6 @@ static int nf_nat_ipv6_nlattr_to_range(struct nlattr *tb[],
static const struct nf_nat_l3proto nf_nat_l3proto_ipv6 = {
.l3proto = NFPROTO_IPV6,
.in_range = nf_nat_ipv6_in_range,
.manip_pkt = nf_nat_ipv6_manip_pkt,
.csum_update = nf_nat_ipv6_csum_update,
.csum_recalc = nf_nat_ipv6_csum_recalc,

23
net/netfilter/nf_nat_core.c
View File

@ -172,11 +172,21 @@ nf_nat_used_tuple(const struct nf_conntrack_tuple *tuple,
}
EXPORT_SYMBOL(nf_nat_used_tuple);
static bool nf_nat_inet_in_range(const struct nf_conntrack_tuple *t,
const struct nf_nat_range2 *range)
{
if (t->src.l3num == NFPROTO_IPV4)
return ntohl(t->src.u3.ip) >= ntohl(range->min_addr.ip) &&
ntohl(t->src.u3.ip) <= ntohl(range->max_addr.ip);
return ipv6_addr_cmp(&t->src.u3.in6, &range->min_addr.in6) >= 0 &&
ipv6_addr_cmp(&t->src.u3.in6, &range->max_addr.in6) <= 0;
}
/* If we source map this tuple so reply looks like reply_tuple, will
* that meet the constraints of range.
*/
static int in_range(const struct nf_nat_l3proto *l3proto,
const struct nf_nat_l4proto *l4proto,
static int in_range(const struct nf_nat_l4proto *l4proto,
const struct nf_conntrack_tuple *tuple,
const struct nf_nat_range2 *range)
{
@ -184,7 +194,7 @@ static int in_range(const struct nf_nat_l3proto *l3proto,
* range specified, otherwise let this drag us onto a new src IP.
*/
if (range->flags & NF_NAT_RANGE_MAP_IPS &&
!l3proto->in_range(tuple, range))
!nf_nat_inet_in_range(tuple, range))
return 0;
if (!(range->flags & NF_NAT_RANGE_PROTO_SPECIFIED) ||
@ -211,7 +221,6 @@ same_src(const struct nf_conn *ct,
static int
find_appropriate_src(struct net *net,
const struct nf_conntrack_zone *zone,
const struct nf_nat_l3proto *l3proto,
const struct nf_nat_l4proto *l4proto,
const struct nf_conntrack_tuple *tuple,
struct nf_conntrack_tuple *result,
@ -229,7 +238,7 @@ find_appropriate_src(struct net *net,
&ct->tuplehash[IP_CT_DIR_REPLY].tuple);
result->dst = tuple->dst;
if (in_range(l3proto, l4proto, result, range))
if (in_range(l4proto, result, range))
return 1;
}
}
@ -463,12 +472,12 @@ get_unique_tuple(struct nf_conntrack_tuple *tuple,
if (maniptype == NF_NAT_MANIP_SRC &&
!(range->flags & NF_NAT_RANGE_PROTO_RANDOM_ALL)) {
/* try the original tuple first */
if (in_range(l3proto, l4proto, orig_tuple, range)) {
if (in_range(l4proto, orig_tuple, range)) {
if (!nf_nat_used_tuple(orig_tuple, ct)) {
*tuple = *orig_tuple;
goto out;
}
} else if (find_appropriate_src(net, zone, l3proto, l4proto,
} else if (find_appropriate_src(net, zone, l4proto,
orig_tuple, tuple, range)) {
pr_debug("get_unique_tuple: Found current src map\n");
if (!nf_nat_used_tuple(tuple, ct))