Now, when we sendmsg, we translate the ep to laddr by selecting the
first element of the list, and then do a lookup for a transport.
But sctp_hash_cmp() will compare it against asoc addr_list, which may
be a subset of ep addr_list, meaning that this chosen laddr may not be
there, and thus making it impossible to find the transport.
So we fix it by using ep + paddr to lookup transports in hashtable. In
sctp_hash_cmp, if .ep is set, we will check if this ep == asoc->ep,
or we will do the laddr check.
Fixes: d6c0256a60e6 ("sctp: add the rhashtable apis for sctp global transport hashtable")
Signed-off-by: Xin Long <lucien.xin@xxxxxxxxx>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@xxxxxxxxx>
Reported-by: Vlad Yasevich <vyasevich@xxxxxxxxx>
---
net/sctp/input.c | 38 +++++++++++++++++++++++---------------
1 file changed, 23 insertions(+), 15 deletions(-)
diff --git a/net/sctp/input.c b/net/sctp/input.c
index d9a6e66..b9a536b 100644
--- a/net/sctp/input.c
+++ b/net/sctp/input.c
@@ -784,6 +784,7 @@ hit:
/* rhashtable for transport */
struct sctp_hash_cmp_arg {
+ const struct sctp_endpoint *ep;
const union sctp_addr *laddr;
const union sctp_addr *paddr;
const struct net *net;
@@ -797,15 +798,20 @@ static inline int sctp_hash_cmp(struct rhashtable_compare_arg *arg,
struct sctp_association *asoc = t->asoc;
const struct net *net = x->net;
- if (x->laddr->v4.sin_port != htons(asoc->base.bind_addr.port))
- return 1;
if (!sctp_cmp_addr_exact(&t->ipaddr, x->paddr))
return 1;
if (!net_eq(sock_net(asoc->base.sk), net))
return 1;
- if (!sctp_bind_addr_match(&asoc->base.bind_addr,
- x->laddr, sctp_sk(asoc->base.sk)))
- return 1;
+ if (x->ep) {
+ if (x->ep != asoc->ep)
+ return 1;
+ } else {
+ if (x->laddr->v4.sin_port != htons(asoc->base.bind_addr.port))
+ return 1;
+ if (!sctp_bind_addr_match(&asoc->base.bind_addr,
+ x->laddr, sctp_sk(asoc->base.sk)))
+ return 1;
+ }
return 0;
}
@@ -832,9 +838,11 @@ static inline u32 sctp_hash_key(const void *data, u32 len, u32 seed)
const struct sctp_hash_cmp_arg *x = data;
const union sctp_addr *paddr = x->paddr;
const struct net *net = x->net;
- u16 lport = x->laddr->v4.sin_port;
+ u16 lport;
u32 addr;
+ lport = x->ep ? htons(x->ep->base.bind_addr.port) :
+ x->laddr->v4.sin_port;
if (paddr->sa.sa_family == AF_INET6)
addr = jhash(&paddr->v6.sin6_addr, 16, seed);
else
@@ -864,12 +872,9 @@ void sctp_transport_hashtable_destroy(void)
void sctp_hash_transport(struct sctp_transport *t)
{
- struct sctp_sockaddr_entry *addr;
struct sctp_hash_cmp_arg arg;
- addr = list_entry(t->asoc->base.bind_addr.address_list.next,
- struct sctp_sockaddr_entry, list);
- arg.laddr = &addr->a;
+ arg.ep = t->asoc->ep;
arg.paddr = &t->ipaddr;
arg.net = sock_net(t->asoc->base.sk);
@@ -891,6 +896,7 @@ struct sctp_transport *sctp_addrs_lookup_transport(
const union sctp_addr *paddr)
{
struct sctp_hash_cmp_arg arg = {
+ .ep = NULL,
.laddr = laddr,
.paddr = paddr,
.net = net,
@@ -904,13 +910,15 @@ struct sctp_transport *sctp_epaddr_lookup_transport(
const struct sctp_endpoint *ep,
const union sctp_addr *paddr)
{
- struct sctp_sockaddr_entry *addr;
struct net *net = sock_net(ep->base.sk);
+ struct sctp_hash_cmp_arg arg = {
+ .ep = ep,
+ .paddr = paddr,
+ .net = net,
+ };
- addr = list_entry(ep->base.bind_addr.address_list.next,
- struct sctp_sockaddr_entry, list);
-
- return sctp_addrs_lookup_transport(net, &addr->a, paddr);
+ return rhashtable_lookup_fast(&sctp_transport_hashtable, &arg,
+ sctp_hash_params);
}
/* Look up an association. */
--
2.1.0
--
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