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sctp: Make the association hashtable handle multiple network namespaces 

- Use struct net in the hash calculation
- Use sock_net(association.base.sk) in the association lookups.
- On receive calculate the network namespace from skb->dev.
- Pass struct net from receive down to the functions that actually
  do the association lookup.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Acked-by: Vlad Yasevich <vyasevich@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric W. Biederman 2012-08-06 08:41:13 +00:00 committed by David S. Miller
parent 4cdadcbcb6
commit 4110cc255d
6 changed files with 54 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
include/net/sctp/sctp.h
View File

@ -156,7 +156,7 @@ void sctp_hash_established(struct sctp_association *);
void sctp_unhash_established(struct sctp_association *);
void sctp_hash_endpoint(struct sctp_endpoint *);
void sctp_unhash_endpoint(struct sctp_endpoint *);
struct sock *sctp_err_lookup(int family, struct sk_buff *,
struct sock *sctp_err_lookup(struct net *net, int family, struct sk_buff *,
struct sctphdr *, struct sctp_association **,
struct sctp_transport **);
void sctp_err_finish(struct sock *, struct sctp_association *);
@ -644,9 +644,9 @@ static inline int sctp_ep_hashfn(struct net *net, __u16 lport)
}
/* This is the hash function for the association hash table. */
static inline int sctp_assoc_hashfn(__u16 lport, __u16 rport)
static inline int sctp_assoc_hashfn(struct net *net, __u16 lport, __u16 rport)
{
int h = (lport << 16) + rport;
int h = (lport << 16) + rport + net_hash_mix(net);
h ^= h>>8;
return h & (sctp_assoc_hashsize - 1);
}

3
include/net/sctp/structs.h
View File

@ -1427,7 +1427,7 @@ int sctp_endpoint_is_peeled_off(struct sctp_endpoint *,
const union sctp_addr *);
struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *,
struct net *, const union sctp_addr *);
int sctp_has_association(const union sctp_addr *laddr,
int sctp_has_association(struct net *net, const union sctp_addr *laddr,
const union sctp_addr *paddr);
int sctp_verify_init(const struct sctp_association *asoc, sctp_cid_t,
@ -2014,6 +2014,7 @@ void sctp_assoc_control_transport(struct sctp_association *,
sctp_transport_cmd_t, sctp_sn_error_t);
struct sctp_transport *sctp_assoc_lookup_tsn(struct sctp_association *, __u32);
struct sctp_transport *sctp_assoc_is_match(struct sctp_association *,
struct net *,
const union sctp_addr *,
const union sctp_addr *);
void sctp_assoc_migrate(struct sctp_association *, struct sock *);

4
net/sctp/associola.c
View File

@ -1089,13 +1089,15 @@ out:
/* Is this the association we are looking for? */
struct sctp_transport *sctp_assoc_is_match(struct sctp_association *asoc,
struct net *net,
const union sctp_addr *laddr,
const union sctp_addr *paddr)
{
struct sctp_transport *transport;
if ((htons(asoc->base.bind_addr.port) == laddr->v4.sin_port) &&
(htons(asoc->peer.port) == paddr->v4.sin_port)) {
(htons(asoc->peer.port) == paddr->v4.sin_port) &&
net_eq(sock_net(asoc->base.sk), net)) {
transport = sctp_assoc_lookup_paddr(asoc, paddr);
if (!transport)
goto out;

6
net/sctp/endpointola.c
View File

@ -345,7 +345,8 @@ static struct sctp_association *__sctp_endpoint_lookup_assoc(
rport = ntohs(paddr->v4.sin_port);
hash = sctp_assoc_hashfn(ep->base.bind_addr.port, rport);
hash = sctp_assoc_hashfn(sock_net(ep->base.sk), ep->base.bind_addr.port,
rport);
head = &sctp_assoc_hashtable[hash];
read_lock(&head->lock);
sctp_for_each_hentry(epb, node, &head->chain) {
@ -388,13 +389,14 @@ int sctp_endpoint_is_peeled_off(struct sctp_endpoint *ep,
{
struct sctp_sockaddr_entry *addr;
struct sctp_bind_addr *bp;
struct net *net = sock_net(ep->base.sk);
bp = &ep->base.bind_addr;
/* This function is called with the socket lock held,
* so the address_list can not change.
*/
list_for_each_entry(addr, &bp->address_list, list) {
if (sctp_has_association(&addr->a, paddr))
if (sctp_has_association(net, &addr->a, paddr))
return 1;
}

64
net/sctp/input.c
View File

@ -66,13 +66,15 @@
/* Forward declarations for internal helpers. */
static int sctp_rcv_ootb(struct sk_buff *);
static struct sctp_association *__sctp_rcv_lookup(struct sk_buff *skb,
static struct sctp_association *__sctp_rcv_lookup(struct net *net,
struct sk_buff *skb,
const union sctp_addr *laddr,
const union sctp_addr *paddr,
struct sctp_transport **transportp);
static struct sctp_endpoint *__sctp_rcv_lookup_endpoint(struct net *net,
const union sctp_addr *laddr);
static struct sctp_association *__sctp_lookup_association(
struct net *net,
const union sctp_addr *local,
const union sctp_addr *peer,
struct sctp_transport **pt);
@ -180,7 +182,7 @@ int sctp_rcv(struct sk_buff *skb)
!af->addr_valid(&dest, NULL, skb))
goto discard_it;
asoc = __sctp_rcv_lookup(skb, &src, &dest, &transport);
asoc = __sctp_rcv_lookup(net, skb, &src, &dest, &transport);
if (!asoc)
ep = __sctp_rcv_lookup_endpoint(net, &dest);
@ -476,7 +478,7 @@ void sctp_icmp_proto_unreachable(struct sock *sk,
}
/* Common lookup code for icmp/icmpv6 error handler. */
struct sock *sctp_err_lookup(int family, struct sk_buff *skb,
struct sock *sctp_err_lookup(struct net *net, int family, struct sk_buff *skb,
struct sctphdr *sctphdr,
struct sctp_association **app,
struct sctp_transport **tpp)
@ -505,7 +507,7 @@ struct sock *sctp_err_lookup(int family, struct sk_buff *skb,
/* Look for an association that matches the incoming ICMP error
* packet.
*/
asoc = __sctp_lookup_association(&saddr, &daddr, &transport);
asoc = __sctp_lookup_association(net, &saddr, &daddr, &transport);
if (!asoc)
return NULL;
@ -588,6 +590,7 @@ void sctp_v4_err(struct sk_buff *skb, __u32 info)
struct inet_sock *inet;
sk_buff_data_t saveip, savesctp;
int err;
struct net *net = dev_net(skb->dev);
if (skb->len < ihlen + 8) {
ICMP_INC_STATS_BH(&init_net, ICMP_MIB_INERRORS);
@ -599,7 +602,7 @@ void sctp_v4_err(struct sk_buff *skb, __u32 info)
savesctp = skb->transport_header;
skb_reset_network_header(skb);
skb_set_transport_header(skb, ihlen);
sk = sctp_err_lookup(AF_INET, skb, sctp_hdr(skb), &asoc, &transport);
sk = sctp_err_lookup(net, AF_INET, skb, sctp_hdr(skb), &asoc, &transport);
/* Put back, the original values. */
skb->network_header = saveip;
skb->transport_header = savesctp;
@ -803,13 +806,15 @@ hit:
/* Insert association into the hash table. */
static void __sctp_hash_established(struct sctp_association *asoc)
{
struct net *net = sock_net(asoc->base.sk);
struct sctp_ep_common *epb;
struct sctp_hashbucket *head;
epb = &asoc->base;
/* Calculate which chain this entry will belong to. */
epb->hashent = sctp_assoc_hashfn(epb->bind_addr.port, asoc->peer.port);
epb->hashent = sctp_assoc_hashfn(net, epb->bind_addr.port,
asoc->peer.port);
head = &sctp_assoc_hashtable[epb->hashent];
@ -832,12 +837,13 @@ void sctp_hash_established(struct sctp_association *asoc)
/* Remove association from the hash table. */
static void __sctp_unhash_established(struct sctp_association *asoc)
{
struct net *net = sock_net(asoc->base.sk);
struct sctp_hashbucket *head;
struct sctp_ep_common *epb;
epb = &asoc->base;
epb->hashent = sctp_assoc_hashfn(epb->bind_addr.port,
epb->hashent = sctp_assoc_hashfn(net, epb->bind_addr.port,
asoc->peer.port);
head = &sctp_assoc_hashtable[epb->hashent];
@ -860,6 +866,7 @@ void sctp_unhash_established(struct sctp_association *asoc)
/* Look up an association. */
static struct sctp_association *__sctp_lookup_association(
struct net *net,
const union sctp_addr *local,
const union sctp_addr *peer,
struct sctp_transport **pt)
@ -874,12 +881,13 @@ static struct sctp_association *__sctp_lookup_association(
/* Optimize here for direct hit, only listening connections can
* have wildcards anyways.
*/
hash = sctp_assoc_hashfn(ntohs(local->v4.sin_port), ntohs(peer->v4.sin_port));
hash = sctp_assoc_hashfn(net, ntohs(local->v4.sin_port),
ntohs(peer->v4.sin_port));
head = &sctp_assoc_hashtable[hash];
read_lock(&head->lock);
sctp_for_each_hentry(epb, node, &head->chain) {
asoc = sctp_assoc(epb);
transport = sctp_assoc_is_match(asoc, local, peer);
transport = sctp_assoc_is_match(asoc, net, local, peer);
if (transport)
goto hit;
}
@ -897,27 +905,29 @@ hit:
/* Look up an association. BH-safe. */
SCTP_STATIC
struct sctp_association *sctp_lookup_association(const union sctp_addr *laddr,
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_association *asoc;
sctp_local_bh_disable();
asoc = __sctp_lookup_association(laddr, paddr, transportp);
asoc = __sctp_lookup_association(net, laddr, paddr, transportp);
sctp_local_bh_enable();
return asoc;
}
/* Is there an association matching the given local and peer addresses? */
int sctp_has_association(const union sctp_addr *laddr,
int sctp_has_association(struct net *net,
const union sctp_addr *laddr,
const union sctp_addr *paddr)
{
struct sctp_association *asoc;
struct sctp_transport *transport;
if ((asoc = sctp_lookup_association(laddr, paddr, &transport))) {
if ((asoc = sctp_lookup_association(net, laddr, paddr, &transport))) {
sctp_association_put(asoc);
return 1;
}
@ -943,7 +953,8 @@ int sctp_has_association(const union sctp_addr *laddr,
* in certain circumstances.
*
*/
static struct sctp_association *__sctp_rcv_init_lookup(struct sk_buff *skb,
static struct sctp_association *__sctp_rcv_init_lookup(struct net *net,
struct sk_buff *skb,
const union sctp_addr *laddr, struct sctp_transport **transportp)
{
struct sctp_association *asoc;
@ -983,7 +994,7 @@ static struct sctp_association *__sctp_rcv_init_lookup(struct sk_buff *skb,
af->from_addr_param(paddr, params.addr, sh->source, 0);
asoc = __sctp_lookup_association(laddr, paddr, &transport);
asoc = __sctp_lookup_association(net, laddr, paddr, &transport);
if (asoc)
return asoc;
}
@ -1006,6 +1017,7 @@ static struct sctp_association *__sctp_rcv_init_lookup(struct sk_buff *skb,
* subsequent ASCONF Chunks. If found, proceed to rule D4.
*/
static struct sctp_association *__sctp_rcv_asconf_lookup(
struct net *net,
sctp_chunkhdr_t *ch,
const union sctp_addr *laddr,
__be16 peer_port,
@ -1025,7 +1037,7 @@ static struct sctp_association *__sctp_rcv_asconf_lookup(
af->from_addr_param(&paddr, param, peer_port, 0);
return __sctp_lookup_association(laddr, &paddr, transportp);
return __sctp_lookup_association(net, laddr, &paddr, transportp);
}
@ -1038,7 +1050,8 @@ static struct sctp_association *__sctp_rcv_asconf_lookup(
* This means that any chunks that can help us identify the association need
* to be looked at to find this association.
*/
static struct sctp_association *__sctp_rcv_walk_lookup(struct sk_buff *skb,
static struct sctp_association *__sctp_rcv_walk_lookup(struct net *net,
struct sk_buff *skb,
const union sctp_addr *laddr,
struct sctp_transport **transportp)
{
@ -1080,7 +1093,8 @@ static struct sctp_association *__sctp_rcv_walk_lookup(struct sk_buff *skb,
case SCTP_CID_ASCONF:
if (have_auth || sctp_addip_noauth)
asoc = __sctp_rcv_asconf_lookup(ch, laddr,
asoc = __sctp_rcv_asconf_lookup(
net, ch, laddr,
sctp_hdr(skb)->source,
transportp);
default:
@ -1103,7 +1117,8 @@ static struct sctp_association *__sctp_rcv_walk_lookup(struct sk_buff *skb,
* include looking inside of INIT/INIT-ACK chunks or after the AUTH
* chunks.
*/
static struct sctp_association *__sctp_rcv_lookup_harder(struct sk_buff *skb,
static struct sctp_association *__sctp_rcv_lookup_harder(struct net *net,
struct sk_buff *skb,
const union sctp_addr *laddr,
struct sctp_transport **transportp)
{
@ -1123,11 +1138,11 @@ static struct sctp_association *__sctp_rcv_lookup_harder(struct sk_buff *skb,
switch (ch->type) {
case SCTP_CID_INIT:
case SCTP_CID_INIT_ACK:
return __sctp_rcv_init_lookup(skb, laddr, transportp);
return __sctp_rcv_init_lookup(net, skb, laddr, transportp);
break;
default:
return __sctp_rcv_walk_lookup(skb, laddr, transportp);
return __sctp_rcv_walk_lookup(net, skb, laddr, transportp);
break;
}
@ -1136,21 +1151,22 @@ static struct sctp_association *__sctp_rcv_lookup_harder(struct sk_buff *skb,
}
/* Lookup an association for an inbound skb. */
static struct sctp_association *__sctp_rcv_lookup(struct sk_buff *skb,
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_association *asoc;
asoc = __sctp_lookup_association(laddr, paddr, transportp);
asoc = __sctp_lookup_association(net, laddr, paddr, transportp);
/* Further lookup for INIT/INIT-ACK packets.
* SCTP Implementors Guide, 2.18 Handling of address
* parameters within the INIT or INIT-ACK.
*/
if (!asoc)
asoc = __sctp_rcv_lookup_harder(skb, laddr, transportp);
asoc = __sctp_rcv_lookup_harder(net, skb, laddr, transportp);
return asoc;
}

3
net/sctp/ipv6.c
View File

@ -154,6 +154,7 @@ SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
struct ipv6_pinfo *np;
sk_buff_data_t saveip, savesctp;
int err;
struct net *net = dev_net(skb->dev);
idev = in6_dev_get(skb->dev);
@ -162,7 +163,7 @@ SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
savesctp = skb->transport_header;
skb_reset_network_header(skb);
skb_set_transport_header(skb, offset);
sk = sctp_err_lookup(AF_INET6, skb, sctp_hdr(skb), &asoc, &transport);
sk = sctp_err_lookup(net, AF_INET6, skb, sctp_hdr(skb), &asoc, &transport);
/* Put back, the original pointers. */
skb->network_header = saveip;
skb->transport_header = savesctp;