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Message-Id: <0e303724a517da7e1eff357aac8ac31c03302415.1668628394.git.lucien.xin@gmail.com>
Date: Wed, 16 Nov 2022 15:01:20 -0500
From: Xin Long <lucien.xin@...il.com>
To: network dev <netdev@...r.kernel.org>, linux-sctp@...r.kernel.org
Cc: davem@...emloft.net, kuba@...nel.org,
Eric Dumazet <edumazet@...gle.com>,
Paolo Abeni <pabeni@...hat.com>,
Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
Neil Horman <nhorman@...driver.com>,
David Ahern <dsahern@...il.com>,
Carlo Carraro <colrack@...il.com>
Subject: [PATCHv2 net-next 5/7] sctp: add dif and sdif check in asoc and ep lookup
This patch at first adds a pernet global l3mdev_accept to decide if it
accepts the packets from a l3mdev when a SCTP socket doesn't bind to
any interface. It's set to 1 to avoid any possible incompatible issue,
and in next patch, a sysctl will be introduced to allow to change it.
Then similar to inet/udp_sk_bound_dev_eq(), sctp_sk_bound_dev_eq() is
added to check either dif or sdif is equal to sk_bound_dev_if, and to
check sid is 0 or l3mdev_accept is 1 if sk_bound_dev_if is not set.
This function is used to match a association or a endpoint, namely
called by sctp_addrs_lookup_transport() and sctp_endpoint_is_match().
All functions that needs updating are:
sctp_rcv():
asoc:
__sctp_rcv_lookup()
__sctp_lookup_association() -> sctp_addrs_lookup_transport()
__sctp_rcv_lookup_harder()
__sctp_rcv_init_lookup()
__sctp_lookup_association() -> sctp_addrs_lookup_transport()
__sctp_rcv_walk_lookup()
__sctp_rcv_asconf_lookup()
__sctp_lookup_association() -> sctp_addrs_lookup_transport()
ep:
__sctp_rcv_lookup_endpoint() -> sctp_endpoint_is_match()
sctp_connect():
sctp_endpoint_is_peeled_off()
__sctp_lookup_association()
sctp_has_association()
sctp_lookup_association()
__sctp_lookup_association() -> sctp_addrs_lookup_transport()
sctp_diag_dump_one():
sctp_transport_lookup_process() -> sctp_addrs_lookup_transport()
Signed-off-by: Xin Long <lucien.xin@...il.com>
---
include/net/netns/sctp.h | 4 ++
include/net/sctp/sctp.h | 6 ++-
include/net/sctp/structs.h | 8 +--
net/sctp/diag.c | 3 +-
net/sctp/endpointola.c | 13 +++--
net/sctp/input.c | 108 ++++++++++++++++++++-----------------
net/sctp/protocol.c | 4 ++
net/sctp/socket.c | 4 +-
8 files changed, 89 insertions(+), 61 deletions(-)
diff --git a/include/net/netns/sctp.h b/include/net/netns/sctp.h
index a681147aecd8..7eff3d981b89 100644
--- a/include/net/netns/sctp.h
+++ b/include/net/netns/sctp.h
@@ -175,6 +175,10 @@ struct netns_sctp {
/* Threshold for autoclose timeout, in seconds. */
unsigned long max_autoclose;
+
+#ifdef CONFIG_NET_L3_MASTER_DEV
+ int l3mdev_accept;
+#endif
};
#endif /* __NETNS_SCTP_H__ */
diff --git a/include/net/sctp/sctp.h b/include/net/sctp/sctp.h
index a04999ee99b0..e499fd753fc4 100644
--- a/include/net/sctp/sctp.h
+++ b/include/net/sctp/sctp.h
@@ -114,7 +114,7 @@ struct sctp_transport *sctp_transport_get_idx(struct net *net,
struct rhashtable_iter *iter, int pos);
int sctp_transport_lookup_process(sctp_callback_t cb, struct net *net,
const union sctp_addr *laddr,
- const union sctp_addr *paddr, void *p);
+ const union sctp_addr *paddr, void *p, int dif);
int sctp_transport_traverse_process(sctp_callback_t cb, sctp_callback_t cb_done,
struct net *net, int *pos, void *p);
int sctp_for_each_endpoint(int (*cb)(struct sctp_endpoint *, void *), void *p);
@@ -162,10 +162,12 @@ void sctp_unhash_transport(struct sctp_transport *t);
struct sctp_transport *sctp_addrs_lookup_transport(
struct net *net,
const union sctp_addr *laddr,
- const union sctp_addr *paddr);
+ const union sctp_addr *paddr,
+ int dif, int sdif);
struct sctp_transport *sctp_epaddr_lookup_transport(
const struct sctp_endpoint *ep,
const union sctp_addr *paddr);
+bool sctp_sk_bound_dev_eq(struct net *net, int bound_dev_if, int dif, int sdif);
/*
* sctp/proc.c
diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index 7b4884c63b26..afa3781e3ca2 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -1379,10 +1379,12 @@ struct sctp_association *sctp_endpoint_lookup_assoc(
struct sctp_transport **);
bool sctp_endpoint_is_peeled_off(struct sctp_endpoint *ep,
const union sctp_addr *paddr);
-struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *,
- struct net *, const union sctp_addr *);
+struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *ep,
+ struct net *net,
+ const union sctp_addr *laddr,
+ int dif, int sdif);
bool sctp_has_association(struct net *net, const union sctp_addr *laddr,
- const union sctp_addr *paddr);
+ const union sctp_addr *paddr, int dif, int sdif);
int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep,
const struct sctp_association *asoc,
diff --git a/net/sctp/diag.c b/net/sctp/diag.c
index d9c6d8f30f09..a557009e9832 100644
--- a/net/sctp/diag.c
+++ b/net/sctp/diag.c
@@ -426,6 +426,7 @@ static int sctp_diag_dump_one(struct netlink_callback *cb,
struct net *net = sock_net(skb->sk);
const struct nlmsghdr *nlh = cb->nlh;
union sctp_addr laddr, paddr;
+ int dif = req->id.idiag_if;
struct sctp_comm_param commp = {
.skb = skb,
.r = req,
@@ -454,7 +455,7 @@ static int sctp_diag_dump_one(struct netlink_callback *cb,
}
return sctp_transport_lookup_process(sctp_sock_dump_one,
- net, &laddr, &paddr, &commp);
+ net, &laddr, &paddr, &commp, dif);
}
static void sctp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
diff --git a/net/sctp/endpointola.c b/net/sctp/endpointola.c
index efffde7f2328..7e77b450697c 100644
--- a/net/sctp/endpointola.c
+++ b/net/sctp/endpointola.c
@@ -246,12 +246,15 @@ void sctp_endpoint_put(struct sctp_endpoint *ep)
/* Is this the endpoint we are looking for? */
struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *ep,
struct net *net,
- const union sctp_addr *laddr)
+ const union sctp_addr *laddr,
+ int dif, int sdif)
{
+ int bound_dev_if = READ_ONCE(ep->base.sk->sk_bound_dev_if);
struct sctp_endpoint *retval = NULL;
- if ((htons(ep->base.bind_addr.port) == laddr->v4.sin_port) &&
- net_eq(ep->base.net, net)) {
+ if (net_eq(ep->base.net, net) &&
+ sctp_sk_bound_dev_eq(net, bound_dev_if, dif, sdif) &&
+ (htons(ep->base.bind_addr.port) == laddr->v4.sin_port)) {
if (sctp_bind_addr_match(&ep->base.bind_addr, laddr,
sctp_sk(ep->base.sk)))
retval = ep;
@@ -298,6 +301,7 @@ struct sctp_association *sctp_endpoint_lookup_assoc(
bool sctp_endpoint_is_peeled_off(struct sctp_endpoint *ep,
const union sctp_addr *paddr)
{
+ int bound_dev_if = READ_ONCE(ep->base.sk->sk_bound_dev_if);
struct sctp_sockaddr_entry *addr;
struct net *net = ep->base.net;
struct sctp_bind_addr *bp;
@@ -307,7 +311,8 @@ bool sctp_endpoint_is_peeled_off(struct sctp_endpoint *ep,
* so the address_list can not change.
*/
list_for_each_entry(addr, &bp->address_list, list) {
- if (sctp_has_association(net, &addr->a, paddr))
+ if (sctp_has_association(net, &addr->a, paddr,
+ bound_dev_if, bound_dev_if))
return true;
}
diff --git a/net/sctp/input.c b/net/sctp/input.c
index 4f43afa8678f..bf70371301ff 100644
--- a/net/sctp/input.c
+++ b/net/sctp/input.c
@@ -50,16 +50,19 @@ static struct sctp_association *__sctp_rcv_lookup(struct net *net,
struct sk_buff *skb,
const union sctp_addr *paddr,
const union sctp_addr *laddr,
- struct sctp_transport **transportp);
+ struct sctp_transport **transportp,
+ int dif, int sdif);
static struct sctp_endpoint *__sctp_rcv_lookup_endpoint(
struct net *net, struct sk_buff *skb,
const union sctp_addr *laddr,
- const union sctp_addr *daddr);
+ const union sctp_addr *daddr,
+ int dif, int sdif);
static struct sctp_association *__sctp_lookup_association(
struct net *net,
const union sctp_addr *local,
const union sctp_addr *peer,
- struct sctp_transport **pt);
+ struct sctp_transport **pt,
+ int dif, int sdif);
static int sctp_add_backlog(struct sock *sk, struct sk_buff *skb);
@@ -92,11 +95,11 @@ int sctp_rcv(struct sk_buff *skb)
struct sctp_chunk *chunk;
union sctp_addr src;
union sctp_addr dest;
- int bound_dev_if;
int family;
struct sctp_af *af;
struct net *net = dev_net(skb->dev);
bool is_gso = skb_is_gso(skb) && skb_is_gso_sctp(skb);
+ int dif, sdif;
if (skb->pkt_type != PACKET_HOST)
goto discard_it;
@@ -141,6 +144,8 @@ int sctp_rcv(struct sk_buff *skb)
/* Initialize local addresses for lookups. */
af->from_skb(&src, skb, 1);
af->from_skb(&dest, skb, 0);
+ dif = af->skb_iif(skb);
+ sdif = af->skb_sdif(skb);
/* If the packet is to or from a non-unicast address,
* silently discard the packet.
@@ -157,35 +162,15 @@ int sctp_rcv(struct sk_buff *skb)
!af->addr_valid(&dest, NULL, skb))
goto discard_it;
- asoc = __sctp_rcv_lookup(net, skb, &src, &dest, &transport);
+ asoc = __sctp_rcv_lookup(net, skb, &src, &dest, &transport, dif, sdif);
if (!asoc)
- ep = __sctp_rcv_lookup_endpoint(net, skb, &dest, &src);
+ ep = __sctp_rcv_lookup_endpoint(net, skb, &dest, &src, dif, sdif);
/* Retrieve the common input handling substructure. */
rcvr = asoc ? &asoc->base : &ep->base;
sk = rcvr->sk;
- /*
- * If a frame arrives on an interface and the receiving socket is
- * bound to another interface, via SO_BINDTODEVICE, treat it as OOTB
- */
- bound_dev_if = READ_ONCE(sk->sk_bound_dev_if);
- if (bound_dev_if && (bound_dev_if != af->skb_iif(skb))) {
- if (transport) {
- sctp_transport_put(transport);
- asoc = NULL;
- transport = NULL;
- } else {
- sctp_endpoint_put(ep);
- ep = NULL;
- }
- sk = net->sctp.ctl_sock;
- ep = sctp_sk(sk)->ep;
- sctp_endpoint_hold(ep);
- rcvr = &ep->base;
- }
-
/*
* RFC 2960, 8.4 - Handle "Out of the blue" Packets.
* An SCTP packet is called an "out of the blue" (OOTB)
@@ -485,6 +470,8 @@ struct sock *sctp_err_lookup(struct net *net, int family, struct sk_buff *skb,
struct sctp_association *asoc;
struct sctp_transport *transport = NULL;
__u32 vtag = ntohl(sctphdr->vtag);
+ int sdif = inet_sdif(skb);
+ int dif = inet_iif(skb);
*app = NULL; *tpp = NULL;
@@ -500,7 +487,7 @@ struct sock *sctp_err_lookup(struct net *net, int family, struct sk_buff *skb,
/* Look for an association that matches the incoming ICMP error
* packet.
*/
- asoc = __sctp_lookup_association(net, &saddr, &daddr, &transport);
+ asoc = __sctp_lookup_association(net, &saddr, &daddr, &transport, dif, sdif);
if (!asoc)
return NULL;
@@ -850,7 +837,8 @@ static inline __u32 sctp_hashfn(const struct net *net, __be16 lport,
static struct sctp_endpoint *__sctp_rcv_lookup_endpoint(
struct net *net, struct sk_buff *skb,
const union sctp_addr *laddr,
- const union sctp_addr *paddr)
+ const union sctp_addr *paddr,
+ int dif, int sdif)
{
struct sctp_hashbucket *head;
struct sctp_endpoint *ep;
@@ -863,7 +851,7 @@ static struct sctp_endpoint *__sctp_rcv_lookup_endpoint(
head = &sctp_ep_hashtable[hash];
read_lock(&head->lock);
sctp_for_each_hentry(ep, &head->chain) {
- if (sctp_endpoint_is_match(ep, net, laddr))
+ if (sctp_endpoint_is_match(ep, net, laddr, dif, sdif))
goto hit;
}
@@ -990,14 +978,26 @@ void sctp_unhash_transport(struct sctp_transport *t)
sctp_hash_params);
}
+bool sctp_sk_bound_dev_eq(struct net *net, int bound_dev_if, int dif, int sdif)
+{
+ bool l3mdev_accept = true;
+
+#if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
+ l3mdev_accept = !!READ_ONCE(net->sctp.l3mdev_accept);
+#endif
+ return inet_bound_dev_eq(l3mdev_accept, bound_dev_if, dif, sdif);
+}
+
/* return a transport with holding it */
struct sctp_transport *sctp_addrs_lookup_transport(
struct net *net,
const union sctp_addr *laddr,
- const union sctp_addr *paddr)
+ const union sctp_addr *paddr,
+ int dif, int sdif)
{
struct rhlist_head *tmp, *list;
struct sctp_transport *t;
+ int bound_dev_if;
struct sctp_hash_cmp_arg arg = {
.paddr = paddr,
.net = net,
@@ -1011,7 +1011,9 @@ struct sctp_transport *sctp_addrs_lookup_transport(
if (!sctp_transport_hold(t))
continue;
- if (sctp_bind_addr_match(&t->asoc->base.bind_addr,
+ bound_dev_if = READ_ONCE(t->asoc->base.sk->sk_bound_dev_if);
+ if (sctp_sk_bound_dev_eq(net, bound_dev_if, dif, sdif) &&
+ sctp_bind_addr_match(&t->asoc->base.bind_addr,
laddr, sctp_sk(t->asoc->base.sk)))
return t;
sctp_transport_put(t);
@@ -1048,12 +1050,13 @@ static struct sctp_association *__sctp_lookup_association(
struct net *net,
const union sctp_addr *local,
const union sctp_addr *peer,
- struct sctp_transport **pt)
+ struct sctp_transport **pt,
+ int dif, int sdif)
{
struct sctp_transport *t;
struct sctp_association *asoc = NULL;
- t = sctp_addrs_lookup_transport(net, local, peer);
+ t = sctp_addrs_lookup_transport(net, local, peer, dif, sdif);
if (!t)
goto out;
@@ -1069,12 +1072,13 @@ static
struct sctp_association *sctp_lookup_association(struct net *net,
const union sctp_addr *laddr,
const union sctp_addr *paddr,
- struct sctp_transport **transportp)
+ struct sctp_transport **transportp,
+ int dif, int sdif)
{
struct sctp_association *asoc;
rcu_read_lock();
- asoc = __sctp_lookup_association(net, laddr, paddr, transportp);
+ asoc = __sctp_lookup_association(net, laddr, paddr, transportp, dif, sdif);
rcu_read_unlock();
return asoc;
@@ -1083,11 +1087,12 @@ struct sctp_association *sctp_lookup_association(struct net *net,
/* Is there an association matching the given local and peer addresses? */
bool sctp_has_association(struct net *net,
const union sctp_addr *laddr,
- const union sctp_addr *paddr)
+ const union sctp_addr *paddr,
+ int dif, int sdif)
{
struct sctp_transport *transport;
- if (sctp_lookup_association(net, laddr, paddr, &transport)) {
+ if (sctp_lookup_association(net, laddr, paddr, &transport, dif, sdif)) {
sctp_transport_put(transport);
return true;
}
@@ -1115,7 +1120,8 @@ bool sctp_has_association(struct net *net,
*/
static struct sctp_association *__sctp_rcv_init_lookup(struct net *net,
struct sk_buff *skb,
- const union sctp_addr *laddr, struct sctp_transport **transportp)
+ const union sctp_addr *laddr, struct sctp_transport **transportp,
+ int dif, int sdif)
{
struct sctp_association *asoc;
union sctp_addr addr;
@@ -1154,7 +1160,7 @@ static struct sctp_association *__sctp_rcv_init_lookup(struct net *net,
if (!af->from_addr_param(paddr, params.addr, sh->source, 0))
continue;
- asoc = __sctp_lookup_association(net, laddr, paddr, transportp);
+ asoc = __sctp_lookup_association(net, laddr, paddr, transportp, dif, sdif);
if (asoc)
return asoc;
}
@@ -1181,7 +1187,8 @@ static struct sctp_association *__sctp_rcv_asconf_lookup(
struct sctp_chunkhdr *ch,
const union sctp_addr *laddr,
__be16 peer_port,
- struct sctp_transport **transportp)
+ struct sctp_transport **transportp,
+ int dif, int sdif)
{
struct sctp_addip_chunk *asconf = (struct sctp_addip_chunk *)ch;
struct sctp_af *af;
@@ -1201,7 +1208,7 @@ static struct sctp_association *__sctp_rcv_asconf_lookup(
if (!af->from_addr_param(&paddr, param, peer_port, 0))
return NULL;
- return __sctp_lookup_association(net, laddr, &paddr, transportp);
+ return __sctp_lookup_association(net, laddr, &paddr, transportp, dif, sdif);
}
@@ -1217,7 +1224,8 @@ static struct sctp_association *__sctp_rcv_asconf_lookup(
static struct sctp_association *__sctp_rcv_walk_lookup(struct net *net,
struct sk_buff *skb,
const union sctp_addr *laddr,
- struct sctp_transport **transportp)
+ struct sctp_transport **transportp,
+ int dif, int sdif)
{
struct sctp_association *asoc = NULL;
struct sctp_chunkhdr *ch;
@@ -1260,7 +1268,7 @@ static struct sctp_association *__sctp_rcv_walk_lookup(struct net *net,
asoc = __sctp_rcv_asconf_lookup(
net, ch, laddr,
sctp_hdr(skb)->source,
- transportp);
+ transportp, dif, sdif);
break;
default:
break;
@@ -1285,7 +1293,8 @@ static struct sctp_association *__sctp_rcv_walk_lookup(struct net *net,
static struct sctp_association *__sctp_rcv_lookup_harder(struct net *net,
struct sk_buff *skb,
const union sctp_addr *laddr,
- struct sctp_transport **transportp)
+ struct sctp_transport **transportp,
+ int dif, int sdif)
{
struct sctp_chunkhdr *ch;
@@ -1309,9 +1318,9 @@ static struct sctp_association *__sctp_rcv_lookup_harder(struct net *net,
/* If this is INIT/INIT-ACK look inside the chunk too. */
if (ch->type == SCTP_CID_INIT || ch->type == SCTP_CID_INIT_ACK)
- return __sctp_rcv_init_lookup(net, skb, laddr, transportp);
+ return __sctp_rcv_init_lookup(net, skb, laddr, transportp, dif, sdif);
- return __sctp_rcv_walk_lookup(net, skb, laddr, transportp);
+ return __sctp_rcv_walk_lookup(net, skb, laddr, transportp, dif, sdif);
}
/* Lookup an association for an inbound skb. */
@@ -1319,11 +1328,12 @@ static struct sctp_association *__sctp_rcv_lookup(struct net *net,
struct sk_buff *skb,
const union sctp_addr *paddr,
const union sctp_addr *laddr,
- struct sctp_transport **transportp)
+ struct sctp_transport **transportp,
+ int dif, int sdif)
{
struct sctp_association *asoc;
- asoc = __sctp_lookup_association(net, laddr, paddr, transportp);
+ asoc = __sctp_lookup_association(net, laddr, paddr, transportp, dif, sdif);
if (asoc)
goto out;
@@ -1331,7 +1341,7 @@ static struct sctp_association *__sctp_rcv_lookup(struct net *net,
* SCTP Implementors Guide, 2.18 Handling of address
* parameters within the INIT or INIT-ACK.
*/
- asoc = __sctp_rcv_lookup_harder(net, skb, laddr, transportp);
+ asoc = __sctp_rcv_lookup_harder(net, skb, laddr, transportp, dif, sdif);
if (asoc)
goto out;
diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c
index a18cf0471a8d..909a89a1cff4 100644
--- a/net/sctp/protocol.c
+++ b/net/sctp/protocol.c
@@ -1394,6 +1394,10 @@ static int __net_init sctp_defaults_init(struct net *net)
/* Initialize maximum autoclose timeout. */
net->sctp.max_autoclose = INT_MAX / HZ;
+#ifdef CONFIG_NET_L3_MASTER_DEV
+ net->sctp.l3mdev_accept = 1;
+#endif
+
status = sctp_sysctl_net_register(net);
if (status)
goto err_sysctl_register;
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 4306164238ef..5acbdf0d38f3 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -5315,14 +5315,14 @@ EXPORT_SYMBOL_GPL(sctp_for_each_endpoint);
int sctp_transport_lookup_process(sctp_callback_t cb, struct net *net,
const union sctp_addr *laddr,
- const union sctp_addr *paddr, void *p)
+ const union sctp_addr *paddr, void *p, int dif)
{
struct sctp_transport *transport;
struct sctp_endpoint *ep;
int err = -ENOENT;
rcu_read_lock();
- transport = sctp_addrs_lookup_transport(net, laddr, paddr);
+ transport = sctp_addrs_lookup_transport(net, laddr, paddr, dif, dif);
if (!transport) {
rcu_read_unlock();
return err;
--
2.31.1
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