From 2d89c68ac78ae432038ef23371d2fa949d725d43 Mon Sep 17 00:00:00 2001 From: Patrick McHardy Date: Sun, 28 Jul 2013 22:54:10 +0200 Subject: [PATCH] netfilter: nf_nat: change sequence number adjustments to 32 bits Using 16 bits is too small, when many adjustments happen the offsets might overflow and break the connection. Signed-off-by: Patrick McHardy Signed-off-by: Pablo Neira Ayuso --- include/linux/netfilter.h | 2 +- include/net/netfilter/nf_conntrack.h | 2 +- include/net/netfilter/nf_nat.h | 2 +- include/net/netfilter/nf_nat_helper.h | 6 +++--- net/netfilter/nf_conntrack_core.c | 2 +- net/netfilter/nf_conntrack_proto_tcp.c | 4 ++-- net/netfilter/nf_nat_helper.c | 8 ++++---- 7 files changed, 13 insertions(+), 13 deletions(-) diff --git a/include/linux/netfilter.h b/include/linux/netfilter.h index f4bbf2c..655d5d1 100644 --- a/include/linux/netfilter.h +++ b/include/linux/netfilter.h @@ -330,7 +330,7 @@ extern struct nfq_ct_hook __rcu *nfq_ct_hook; struct nfq_ct_nat_hook { void (*seq_adjust)(struct sk_buff *skb, struct nf_conn *ct, - u32 ctinfo, int off); + u32 ctinfo, s32 off); }; extern struct nfq_ct_nat_hook __rcu *nfq_ct_nat_hook; #else diff --git a/include/net/netfilter/nf_conntrack.h b/include/net/netfilter/nf_conntrack.h index 939aced..e5eb8b6 100644 --- a/include/net/netfilter/nf_conntrack.h +++ b/include/net/netfilter/nf_conntrack.h @@ -234,7 +234,7 @@ static inline bool nf_ct_kill(struct nf_conn *ct) } /* These are for NAT. Icky. */ -extern s16 (*nf_ct_nat_offset)(const struct nf_conn *ct, +extern s32 (*nf_ct_nat_offset)(const struct nf_conn *ct, enum ip_conntrack_dir dir, u32 seq); diff --git a/include/net/netfilter/nf_nat.h b/include/net/netfilter/nf_nat.h index ad14a79..e244141 100644 --- a/include/net/netfilter/nf_nat.h +++ b/include/net/netfilter/nf_nat.h @@ -19,7 +19,7 @@ struct nf_nat_seq { u_int32_t correction_pos; /* sequence number offset before and after last modification */ - int16_t offset_before, offset_after; + int32_t offset_before, offset_after; }; #include diff --git a/include/net/netfilter/nf_nat_helper.h b/include/net/netfilter/nf_nat_helper.h index b4d6bfc..194c347 100644 --- a/include/net/netfilter/nf_nat_helper.h +++ b/include/net/netfilter/nf_nat_helper.h @@ -41,7 +41,7 @@ extern int nf_nat_mangle_udp_packet(struct sk_buff *skb, extern void nf_nat_set_seq_adjust(struct nf_conn *ct, enum ip_conntrack_info ctinfo, - __be32 seq, s16 off); + __be32 seq, s32 off); extern int nf_nat_seq_adjust(struct sk_buff *skb, struct nf_conn *ct, enum ip_conntrack_info ctinfo, @@ -56,11 +56,11 @@ extern int (*nf_nat_seq_adjust_hook)(struct sk_buff *skb, extern void nf_nat_follow_master(struct nf_conn *ct, struct nf_conntrack_expect *this); -extern s16 nf_nat_get_offset(const struct nf_conn *ct, +extern s32 nf_nat_get_offset(const struct nf_conn *ct, enum ip_conntrack_dir dir, u32 seq); extern void nf_nat_tcp_seq_adjust(struct sk_buff *skb, struct nf_conn *ct, - u32 dir, int off); + u32 dir, s32 off); #endif diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c index 089e408..0934611 100644 --- a/net/netfilter/nf_conntrack_core.c +++ b/net/netfilter/nf_conntrack_core.c @@ -1695,7 +1695,7 @@ err_stat: return ret; } -s16 (*nf_ct_nat_offset)(const struct nf_conn *ct, +s32 (*nf_ct_nat_offset)(const struct nf_conn *ct, enum ip_conntrack_dir dir, u32 seq); EXPORT_SYMBOL_GPL(nf_ct_nat_offset); diff --git a/net/netfilter/nf_conntrack_proto_tcp.c b/net/netfilter/nf_conntrack_proto_tcp.c index 7dcc376..8f308d8 100644 --- a/net/netfilter/nf_conntrack_proto_tcp.c +++ b/net/netfilter/nf_conntrack_proto_tcp.c @@ -496,7 +496,7 @@ static void tcp_sack(const struct sk_buff *skb, unsigned int dataoff, } #ifdef CONFIG_NF_NAT_NEEDED -static inline s16 nat_offset(const struct nf_conn *ct, +static inline s32 nat_offset(const struct nf_conn *ct, enum ip_conntrack_dir dir, u32 seq) { @@ -525,7 +525,7 @@ static bool tcp_in_window(const struct nf_conn *ct, struct ip_ct_tcp_state *receiver = &state->seen[!dir]; const struct nf_conntrack_tuple *tuple = &ct->tuplehash[dir].tuple; __u32 seq, ack, sack, end, win, swin; - s16 receiver_offset; + s32 receiver_offset; bool res; /* diff --git a/net/netfilter/nf_nat_helper.c b/net/netfilter/nf_nat_helper.c index a7262ed..ff4a589 100644 --- a/net/netfilter/nf_nat_helper.c +++ b/net/netfilter/nf_nat_helper.c @@ -68,13 +68,13 @@ adjust_tcp_sequence(u32 seq, } /* Get the offset value, for conntrack */ -s16 nf_nat_get_offset(const struct nf_conn *ct, +s32 nf_nat_get_offset(const struct nf_conn *ct, enum ip_conntrack_dir dir, u32 seq) { struct nf_conn_nat *nat = nfct_nat(ct); struct nf_nat_seq *this_way; - s16 offset; + s32 offset; if (!nat) return 0; @@ -143,7 +143,7 @@ static int enlarge_skb(struct sk_buff *skb, unsigned int extra) } void nf_nat_set_seq_adjust(struct nf_conn *ct, enum ip_conntrack_info ctinfo, - __be32 seq, s16 off) + __be32 seq, s32 off) { if (!off) return; @@ -370,7 +370,7 @@ nf_nat_seq_adjust(struct sk_buff *skb, struct tcphdr *tcph; int dir; __be32 newseq, newack; - s16 seqoff, ackoff; + s32 seqoff, ackoff; struct nf_conn_nat *nat = nfct_nat(ct); struct nf_nat_seq *this_way, *other_way; int res; -- 2.7.4