From 096d09067a67702f9802e5b3a0fc2ea9c22f1cf6 Mon Sep 17 00:00:00 2001 From: Florian Westphal Date: Tue, 19 Feb 2019 17:38:20 +0100 Subject: [PATCH] netfilter: nat: move nlattr parse and xfrm session decode to core None of these functions calls any external functions, moving them allows to avoid both the indirection and a need to export these symbols. Signed-off-by: Florian Westphal Signed-off-by: Pablo Neira Ayuso --- include/net/netfilter/nf_nat_l3proto.h | 9 -- net/ipv4/netfilter/nf_nat_l3proto_ipv4.c | 58 --------- net/ipv6/netfilter/nf_nat_l3proto_ipv6.c | 60 ---------- net/netfilter/nf_nat_core.c | 142 ++++++++++++++++++++--- 4 files changed, 123 insertions(+), 146 deletions(-) diff --git a/include/net/netfilter/nf_nat_l3proto.h b/include/net/netfilter/nf_nat_l3proto.h index d774ca0c4c5e..100972bbd9ad 100644 --- a/include/net/netfilter/nf_nat_l3proto.h +++ b/include/net/netfilter/nf_nat_l3proto.h @@ -18,15 +18,6 @@ struct nf_nat_l3proto { void (*csum_recalc)(struct sk_buff *skb, u8 proto, void *data, __sum16 *check, int datalen, int oldlen); - - void (*decode_session)(struct sk_buff *skb, - const struct nf_conn *ct, - enum ip_conntrack_dir dir, - unsigned long statusbit, - struct flowi *fl); - - int (*nlattr_to_range)(struct nlattr *tb[], - struct nf_nat_range2 *range); }; int nf_nat_l3proto_register(const struct nf_nat_l3proto *); diff --git a/net/ipv4/netfilter/nf_nat_l3proto_ipv4.c b/net/ipv4/netfilter/nf_nat_l3proto_ipv4.c index 4b07eb8a9b18..36b4f9659ffa 100644 --- a/net/ipv4/netfilter/nf_nat_l3proto_ipv4.c +++ b/net/ipv4/netfilter/nf_nat_l3proto_ipv4.c @@ -28,40 +28,6 @@ static const struct nf_nat_l3proto nf_nat_l3proto_ipv4; -#ifdef CONFIG_XFRM -static void nf_nat_ipv4_decode_session(struct sk_buff *skb, - const struct nf_conn *ct, - enum ip_conntrack_dir dir, - unsigned long statusbit, - struct flowi *fl) -{ - const struct nf_conntrack_tuple *t = &ct->tuplehash[dir].tuple; - struct flowi4 *fl4 = &fl->u.ip4; - - if (ct->status & statusbit) { - fl4->daddr = t->dst.u3.ip; - if (t->dst.protonum == IPPROTO_TCP || - t->dst.protonum == IPPROTO_UDP || - t->dst.protonum == IPPROTO_UDPLITE || - t->dst.protonum == IPPROTO_DCCP || - t->dst.protonum == IPPROTO_SCTP) - fl4->fl4_dport = t->dst.u.all; - } - - statusbit ^= IPS_NAT_MASK; - - if (ct->status & statusbit) { - fl4->saddr = t->src.u3.ip; - if (t->dst.protonum == IPPROTO_TCP || - t->dst.protonum == IPPROTO_UDP || - t->dst.protonum == IPPROTO_UDPLITE || - t->dst.protonum == IPPROTO_DCCP || - t->dst.protonum == IPPROTO_SCTP) - fl4->fl4_sport = t->src.u.all; - } -} -#endif /* CONFIG_XFRM */ - static bool nf_nat_ipv4_manip_pkt(struct sk_buff *skb, unsigned int iphdroff, const struct nf_conntrack_tuple *target, @@ -127,35 +93,11 @@ static void nf_nat_ipv4_csum_recalc(struct sk_buff *skb, htons(oldlen), htons(datalen), true); } -#if IS_ENABLED(CONFIG_NF_CT_NETLINK) -static int nf_nat_ipv4_nlattr_to_range(struct nlattr *tb[], - struct nf_nat_range2 *range) -{ - if (tb[CTA_NAT_V4_MINIP]) { - range->min_addr.ip = nla_get_be32(tb[CTA_NAT_V4_MINIP]); - range->flags |= NF_NAT_RANGE_MAP_IPS; - } - - if (tb[CTA_NAT_V4_MAXIP]) - range->max_addr.ip = nla_get_be32(tb[CTA_NAT_V4_MAXIP]); - else - range->max_addr.ip = range->min_addr.ip; - - return 0; -} -#endif - static const struct nf_nat_l3proto nf_nat_l3proto_ipv4 = { .l3proto = NFPROTO_IPV4, .manip_pkt = nf_nat_ipv4_manip_pkt, .csum_update = nf_nat_ipv4_csum_update, .csum_recalc = nf_nat_ipv4_csum_recalc, -#if IS_ENABLED(CONFIG_NF_CT_NETLINK) - .nlattr_to_range = nf_nat_ipv4_nlattr_to_range, -#endif -#ifdef CONFIG_XFRM - .decode_session = nf_nat_ipv4_decode_session, -#endif }; int nf_nat_icmp_reply_translation(struct sk_buff *skb, diff --git a/net/ipv6/netfilter/nf_nat_l3proto_ipv6.c b/net/ipv6/netfilter/nf_nat_l3proto_ipv6.c index 490bfd3c9162..5d667cf9bab8 100644 --- a/net/ipv6/netfilter/nf_nat_l3proto_ipv6.c +++ b/net/ipv6/netfilter/nf_nat_l3proto_ipv6.c @@ -28,40 +28,6 @@ static const struct nf_nat_l3proto nf_nat_l3proto_ipv6; -#ifdef CONFIG_XFRM -static void nf_nat_ipv6_decode_session(struct sk_buff *skb, - const struct nf_conn *ct, - enum ip_conntrack_dir dir, - unsigned long statusbit, - struct flowi *fl) -{ - const struct nf_conntrack_tuple *t = &ct->tuplehash[dir].tuple; - struct flowi6 *fl6 = &fl->u.ip6; - - if (ct->status & statusbit) { - fl6->daddr = t->dst.u3.in6; - if (t->dst.protonum == IPPROTO_TCP || - t->dst.protonum == IPPROTO_UDP || - t->dst.protonum == IPPROTO_UDPLITE || - t->dst.protonum == IPPROTO_DCCP || - t->dst.protonum == IPPROTO_SCTP) - fl6->fl6_dport = t->dst.u.all; - } - - statusbit ^= IPS_NAT_MASK; - - if (ct->status & statusbit) { - fl6->saddr = t->src.u3.in6; - if (t->dst.protonum == IPPROTO_TCP || - t->dst.protonum == IPPROTO_UDP || - t->dst.protonum == IPPROTO_UDPLITE || - t->dst.protonum == IPPROTO_DCCP || - t->dst.protonum == IPPROTO_SCTP) - fl6->fl6_sport = t->src.u.all; - } -} -#endif - static bool nf_nat_ipv6_manip_pkt(struct sk_buff *skb, unsigned int iphdroff, const struct nf_conntrack_tuple *target, @@ -136,37 +102,11 @@ static void nf_nat_ipv6_csum_recalc(struct sk_buff *skb, htons(oldlen), htons(datalen), true); } -#if IS_ENABLED(CONFIG_NF_CT_NETLINK) -static int nf_nat_ipv6_nlattr_to_range(struct nlattr *tb[], - struct nf_nat_range2 *range) -{ - if (tb[CTA_NAT_V6_MINIP]) { - nla_memcpy(&range->min_addr.ip6, tb[CTA_NAT_V6_MINIP], - sizeof(struct in6_addr)); - range->flags |= NF_NAT_RANGE_MAP_IPS; - } - - if (tb[CTA_NAT_V6_MAXIP]) - nla_memcpy(&range->max_addr.ip6, tb[CTA_NAT_V6_MAXIP], - sizeof(struct in6_addr)); - else - range->max_addr = range->min_addr; - - return 0; -} -#endif - static const struct nf_nat_l3proto nf_nat_l3proto_ipv6 = { .l3proto = NFPROTO_IPV6, .manip_pkt = nf_nat_ipv6_manip_pkt, .csum_update = nf_nat_ipv6_csum_update, .csum_recalc = nf_nat_ipv6_csum_recalc, -#if IS_ENABLED(CONFIG_NF_CT_NETLINK) - .nlattr_to_range = nf_nat_ipv6_nlattr_to_range, -#endif -#ifdef CONFIG_XFRM - .decode_session = nf_nat_ipv6_decode_session, -#endif }; int nf_nat_icmpv6_reply_translation(struct sk_buff *skb, diff --git a/net/netfilter/nf_nat_core.c b/net/netfilter/nf_nat_core.c index 35e61038ae96..0f39ae7a9f34 100644 --- a/net/netfilter/nf_nat_core.c +++ b/net/netfilter/nf_nat_core.c @@ -65,9 +65,74 @@ __nf_nat_l3proto_find(u8 family) } #ifdef CONFIG_XFRM +static void nf_nat_ipv4_decode_session(struct sk_buff *skb, + const struct nf_conn *ct, + enum ip_conntrack_dir dir, + unsigned long statusbit, + struct flowi *fl) +{ + const struct nf_conntrack_tuple *t = &ct->tuplehash[dir].tuple; + struct flowi4 *fl4 = &fl->u.ip4; + + if (ct->status & statusbit) { + fl4->daddr = t->dst.u3.ip; + if (t->dst.protonum == IPPROTO_TCP || + t->dst.protonum == IPPROTO_UDP || + t->dst.protonum == IPPROTO_UDPLITE || + t->dst.protonum == IPPROTO_DCCP || + t->dst.protonum == IPPROTO_SCTP) + fl4->fl4_dport = t->dst.u.all; + } + + statusbit ^= IPS_NAT_MASK; + + if (ct->status & statusbit) { + fl4->saddr = t->src.u3.ip; + if (t->dst.protonum == IPPROTO_TCP || + t->dst.protonum == IPPROTO_UDP || + t->dst.protonum == IPPROTO_UDPLITE || + t->dst.protonum == IPPROTO_DCCP || + t->dst.protonum == IPPROTO_SCTP) + fl4->fl4_sport = t->src.u.all; + } +} + +static void nf_nat_ipv6_decode_session(struct sk_buff *skb, + const struct nf_conn *ct, + enum ip_conntrack_dir dir, + unsigned long statusbit, + struct flowi *fl) +{ +#if IS_ENABLED(CONFIG_IPV6) + const struct nf_conntrack_tuple *t = &ct->tuplehash[dir].tuple; + struct flowi6 *fl6 = &fl->u.ip6; + + if (ct->status & statusbit) { + fl6->daddr = t->dst.u3.in6; + if (t->dst.protonum == IPPROTO_TCP || + t->dst.protonum == IPPROTO_UDP || + t->dst.protonum == IPPROTO_UDPLITE || + t->dst.protonum == IPPROTO_DCCP || + t->dst.protonum == IPPROTO_SCTP) + fl6->fl6_dport = t->dst.u.all; + } + + statusbit ^= IPS_NAT_MASK; + + if (ct->status & statusbit) { + fl6->saddr = t->src.u3.in6; + if (t->dst.protonum == IPPROTO_TCP || + t->dst.protonum == IPPROTO_UDP || + t->dst.protonum == IPPROTO_UDPLITE || + t->dst.protonum == IPPROTO_DCCP || + t->dst.protonum == IPPROTO_SCTP) + fl6->fl6_sport = t->src.u.all; + } +#endif +} + static void __nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl) { - const struct nf_nat_l3proto *l3proto; const struct nf_conn *ct; enum ip_conntrack_info ctinfo; enum ip_conntrack_dir dir; @@ -79,17 +144,20 @@ static void __nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl) return; family = nf_ct_l3num(ct); - l3proto = __nf_nat_l3proto_find(family); - if (l3proto == NULL) - return; - dir = CTINFO2DIR(ctinfo); if (dir == IP_CT_DIR_ORIGINAL) statusbit = IPS_DST_NAT; else statusbit = IPS_SRC_NAT; - l3proto->decode_session(skb, ct, dir, statusbit, fl); + switch (family) { + case NFPROTO_IPV4: + nf_nat_ipv4_decode_session(skb, ct, dir, statusbit, fl); + return; + case NFPROTO_IPV6: + nf_nat_ipv6_decode_session(skb, ct, dir, statusbit, fl); + return; + } } int nf_xfrm_me_harder(struct net *net, struct sk_buff *skb, unsigned int family) @@ -887,10 +955,43 @@ static const struct nla_policy nat_nla_policy[CTA_NAT_MAX+1] = { [CTA_NAT_PROTO] = { .type = NLA_NESTED }, }; +static int nf_nat_ipv4_nlattr_to_range(struct nlattr *tb[], + struct nf_nat_range2 *range) +{ + if (tb[CTA_NAT_V4_MINIP]) { + range->min_addr.ip = nla_get_be32(tb[CTA_NAT_V4_MINIP]); + range->flags |= NF_NAT_RANGE_MAP_IPS; + } + + if (tb[CTA_NAT_V4_MAXIP]) + range->max_addr.ip = nla_get_be32(tb[CTA_NAT_V4_MAXIP]); + else + range->max_addr.ip = range->min_addr.ip; + + return 0; +} + +static int nf_nat_ipv6_nlattr_to_range(struct nlattr *tb[], + struct nf_nat_range2 *range) +{ + if (tb[CTA_NAT_V6_MINIP]) { + nla_memcpy(&range->min_addr.ip6, tb[CTA_NAT_V6_MINIP], + sizeof(struct in6_addr)); + range->flags |= NF_NAT_RANGE_MAP_IPS; + } + + if (tb[CTA_NAT_V6_MAXIP]) + nla_memcpy(&range->max_addr.ip6, tb[CTA_NAT_V6_MAXIP], + sizeof(struct in6_addr)); + else + range->max_addr = range->min_addr; + + return 0; +} + static int nfnetlink_parse_nat(const struct nlattr *nat, - const struct nf_conn *ct, struct nf_nat_range2 *range, - const struct nf_nat_l3proto *l3proto) + const struct nf_conn *ct, struct nf_nat_range2 *range) { struct nlattr *tb[CTA_NAT_MAX+1]; int err; @@ -901,8 +1002,19 @@ nfnetlink_parse_nat(const struct nlattr *nat, if (err < 0) return err; - err = l3proto->nlattr_to_range(tb, range); - if (err < 0) + switch (nf_ct_l3num(ct)) { + case NFPROTO_IPV4: + err = nf_nat_ipv4_nlattr_to_range(tb, range); + break; + case NFPROTO_IPV6: + err = nf_nat_ipv6_nlattr_to_range(tb, range); + break; + default: + err = -EPROTONOSUPPORT; + break; + } + + if (err) return err; if (!tb[CTA_NAT_PROTO]) @@ -918,7 +1030,6 @@ nfnetlink_parse_nat_setup(struct nf_conn *ct, const struct nlattr *attr) { struct nf_nat_range2 range; - const struct nf_nat_l3proto *l3proto; int err; /* Should not happen, restricted to creating new conntracks @@ -927,18 +1038,11 @@ nfnetlink_parse_nat_setup(struct nf_conn *ct, if (WARN_ON_ONCE(nf_nat_initialized(ct, manip))) return -EEXIST; - /* Make sure that L3 NAT is there by when we call nf_nat_setup_info to - * attach the null binding, otherwise this may oops. - */ - l3proto = __nf_nat_l3proto_find(nf_ct_l3num(ct)); - if (l3proto == NULL) - return -EAGAIN; - /* No NAT information has been passed, allocate the null-binding */ if (attr == NULL) return __nf_nat_alloc_null_binding(ct, manip) == NF_DROP ? -ENOMEM : 0; - err = nfnetlink_parse_nat(attr, ct, &range, l3proto); + err = nfnetlink_parse_nat(attr, ct, &range); if (err < 0) return err;