diff options
Diffstat (limited to 'net/netfilter/nf_nat_helper.c')
| -rw-r--r-- | net/netfilter/nf_nat_helper.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/net/netfilter/nf_nat_helper.c b/net/netfilter/nf_nat_helper.c index a263505455fc..067d6d6f6b7d 100644 --- a/net/netfilter/nf_nat_helper.c +++ b/net/netfilter/nf_nat_helper.c @@ -198,3 +198,22 @@ void nf_nat_follow_master(struct nf_conn *ct, nf_nat_setup_info(ct, &range, NF_NAT_MANIP_DST); } EXPORT_SYMBOL(nf_nat_follow_master); + +u16 nf_nat_exp_find_port(struct nf_conntrack_expect *exp, u16 port) +{ + /* Try to get same port: if not, try to change it. */ + for (; port != 0; port++) { + int res; + + exp->tuple.dst.u.tcp.port = htons(port); + res = nf_ct_expect_related(exp, 0); + if (res == 0) + return port; + + if (res != -EBUSY) + break; + } + + return 0; +} +EXPORT_SYMBOL_GPL(nf_nat_exp_find_port); |