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Date: Tue, 14 Aug 2012 23:18:57 -0400
From: Vlad Yasevich <vyasevich@...il.com>
To: "Eric W. Biederman" <ebiederm@...ssion.com>
CC: David Miller <davem@...emloft.net>, linux-sctp@...r.kernel.org,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
Jan Ariyasu <jan.ariyasu@...com>,
Jan Ariyasu <jan.ariyasu@...il.com>,
Neil Horman <nhorman@...driver.com>,
Thomas Graf <tgraf@...radead.org>, Xi Wang <xi.wang@...il.com>
Subject: Re: [PATCH net-next 3/9] sctp: Make the association hashtable handle
multiple network namespaces
On 08/06/2012 02:41 PM, Eric W. Biederman wrote:
>
> - 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@...ssion.com>
Acked-by: Vlad Yasevich <vyasevich@...il.com>
> ---
> include/net/sctp/sctp.h | 6 ++--
> include/net/sctp/structs.h | 3 +-
> net/sctp/associola.c | 4 ++-
> net/sctp/endpointola.c | 6 +++-
> net/sctp/input.c | 64 +++++++++++++++++++++++++++----------------
> net/sctp/ipv6.c | 3 +-
> 6 files changed, 54 insertions(+), 32 deletions(-)
>
> diff --git a/include/net/sctp/sctp.h b/include/net/sctp/sctp.h
> index 87b119f..640915a 100644
> --- a/include/net/sctp/sctp.h
> +++ b/include/net/sctp/sctp.h
> @@ -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);
> }
> diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
> index 9f9de55..c0563d1 100644
> --- a/include/net/sctp/structs.h
> +++ b/include/net/sctp/structs.h
> @@ -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 *);
> diff --git a/net/sctp/associola.c b/net/sctp/associola.c
> index ebaef3e..a3601f3 100644
> --- a/net/sctp/associola.c
> +++ b/net/sctp/associola.c
> @@ -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;
> diff --git a/net/sctp/endpointola.c b/net/sctp/endpointola.c
> index 50c87b4..6b76393 100644
> --- a/net/sctp/endpointola.c
> +++ b/net/sctp/endpointola.c
> @@ -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;
> }
>
> diff --git a/net/sctp/input.c b/net/sctp/input.c
> index c0ca893..a7e9a85 100644
> --- a/net/sctp/input.c
> +++ b/net/sctp/input.c
> @@ -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;
> }
> diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c
> index ed7139e..2165a7e 100644
> --- a/net/sctp/ipv6.c
> +++ b/net/sctp/ipv6.c
> @@ -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;
>
--
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