On Aug 25, 2011, at 10:30 AM, Chuck Lever wrote:
> This seems like a good direction to go in. More comments below.
>
> On Aug 24, 2011, at 1:58 AM, Mi Jinlong wrote:
>
>> From: Mi Jinlong <mijinlong@xxxxxxxxxxxxxx>
>> Date: Mon, 24 Aug 2011 13:22:39 +0800
>> Subject: [PATCH] SUNRPC: Replace svc_addr_u by sockaddr_storage
>>
>> For IPv6 local address, lockd can not callback to client for
>> missing scope id when binding address at inet6_bind:
>>
>> 324 if (addr_type & IPV6_ADDR_LINKLOCAL) {
>> 325 if (addr_len >= sizeof(struct sockaddr_in6) &&
>> 326 addr->sin6_scope_id) {
>> 327 /* Override any existing binding, if another one
>> 328 * is supplied by user.
>> 329 */
>> 330 sk->sk_bound_dev_if = addr->sin6_scope_id;
>> 331 }
>> 332
>> 333 /* Binding to link-local address requires an interface */
>> 334 if (!sk->sk_bound_dev_if) {
>> 335 err = -EINVAL;
>> 336 goto out_unlock;
>> 337 }
>>
>> Replacing svc_addr_u by sockaddr_storage, let rqstp->rq_daddr contains more info
>> besides address.
>>
>> Signed-off-by: Mi Jinlong <mijinlong@xxxxxxxxxxxxxx>
>> ---
>> fs/lockd/host.c | 14 ++------------
>> fs/nfsd/nfs4state.c | 16 +---------------
>> include/linux/sunrpc/svc.h | 30 +++++++++++++++++++++---------
>> net/sunrpc/svc_xprt.c | 13 ++-----------
>> net/sunrpc/svcsock.c | 9 +++++----
>> 5 files changed, 31 insertions(+), 51 deletions(-)
>>
>> diff --git a/fs/lockd/host.c b/fs/lockd/host.c
>> index b7c99bf..b23db05 100644
>> --- a/fs/lockd/host.c
>> +++ b/fs/lockd/host.c
>> @@ -316,14 +316,8 @@ struct nlm_host *nlmsvc_lookup_host(const struct svc_rqst *rqstp,
>> struct hlist_node *pos;
>> struct nlm_host *host = NULL;
>> struct nsm_handle *nsm = NULL;
>> - struct sockaddr_in sin = {
>> - .sin_family = AF_INET,
>> - };
>> - struct sockaddr_in6 sin6 = {
>> - .sin6_family = AF_INET6,
>> - };
>> struct sockaddr *src_sap;
>> - size_t src_len = rqstp->rq_addrlen;
>> + size_t src_len = rqstp->rq_daddrlen;
>> struct nlm_lookup_host_info ni = {
>> .server = 1,
>> .sap = svc_addr(rqstp),
>> @@ -342,12 +336,8 @@ struct nlm_host *nlmsvc_lookup_host(const struct svc_rqst *rqstp,
>>
>> switch (ni.sap->sa_family) {
>> case AF_INET:
>> - sin.sin_addr.s_addr = rqstp->rq_daddr.addr.s_addr;
>> - src_sap = (struct sockaddr *)&sin;
>> - break;
>> case AF_INET6:
>> - ipv6_addr_copy(&sin6.sin6_addr, &rqstp->rq_daddr.addr6);
>> - src_sap = (struct sockaddr *)&sin6;
>> + src_sap = svc_daddr(rqstp);
>> break;
>> default:
>> dprintk("lockd: %s failed; unrecognized address family\n",
>
> With the destination address promoted to a full sockaddr, we probably do not need this switch any more.
>
> I notice that the IPv6 fork of rpc_cmp_addr() does not consider the scope IDs of the passed-in addresses. Perhaps it should?
>
>> diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
>> index 3787ec1..07a18a5 100644
>> --- a/fs/nfsd/nfs4state.c
>> +++ b/fs/nfsd/nfs4state.c
>> @@ -1173,20 +1173,6 @@ find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
>> return NULL;
>> }
>>
>> -static void rpc_svcaddr2sockaddr(struct sockaddr *sa, unsigned short family, union svc_addr_u *svcaddr)
>> -{
>> - switch (family) {
>> - case AF_INET:
>> - ((struct sockaddr_in *)sa)->sin_family = AF_INET;
>> - ((struct sockaddr_in *)sa)->sin_addr = svcaddr->addr;
>> - return;
>> - case AF_INET6:
>> - ((struct sockaddr_in6 *)sa)->sin6_family = AF_INET6;
>> - ((struct sockaddr_in6 *)sa)->sin6_addr = svcaddr->addr6;
>> - return;
>> - }
>> -}
>> -
>> static void
>> gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp)
>> {
>> @@ -1218,7 +1204,7 @@ gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_r
>>
>> conn->cb_prog = se->se_callback_prog;
>> conn->cb_ident = se->se_callback_ident;
>> - rpc_svcaddr2sockaddr((struct sockaddr *)&conn->cb_saddr, expected_family, &rqstp->rq_daddr);
>> + memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen);
>> return;
>> out_err:
>> conn->cb_addr.ss_family = AF_UNSPEC;
>> diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h
>> index 223588a..3bc0dc9 100644
>> --- a/include/linux/sunrpc/svc.h
>> +++ b/include/linux/sunrpc/svc.h
>> @@ -212,11 +212,6 @@ static inline void svc_putu32(struct kvec *iov, __be32 val)
>> iov->iov_len += sizeof(__be32);
>> }
>>
>> -union svc_addr_u {
>> - struct in_addr addr;
>> - struct in6_addr addr6;
>> -};
>> -
>> /*
>> * The context of a single thread, including the request currently being
>> * processed.
>> @@ -225,8 +220,12 @@ struct svc_rqst {
>> struct list_head rq_list; /* idle list */
>> struct list_head rq_all; /* all threads list */
>> struct svc_xprt * rq_xprt; /* transport ptr */
>> +
>> struct sockaddr_storage rq_addr; /* peer address */
>> size_t rq_addrlen;
>> + struct sockaddr_storage rq_daddr; /* dest addr of request
>> + * - reply from here */
>> + size_t rq_daddrlen;
>>
>> struct svc_serv * rq_server; /* RPC service definition */
>> struct svc_pool * rq_pool; /* thread pool */
>> @@ -255,9 +254,6 @@ struct svc_rqst {
>> unsigned short
>> rq_secure : 1; /* secure port */
>>
>> - union svc_addr_u rq_daddr; /* dest addr of request
>> - * - reply from here */
>> -
>> void * rq_argp; /* decoded arguments */
>> void * rq_resp; /* xdr'd results */
>> void * rq_auth_data; /* flavor-specific data */
>> @@ -300,6 +296,21 @@ static inline struct sockaddr *svc_addr(const struct svc_rqst *rqst)
>> return (struct sockaddr *) &rqst->rq_addr;
>> }
>>
>> +static inline struct sockaddr_in *svc_daddr_in(const struct svc_rqst *rqst)
>> +{
>> + return (struct sockaddr_in *) &rqst->rq_daddr;
>> +}
>> +
>> +static inline struct sockaddr_in6 *svc_daddr_in6(const struct svc_rqst *rqst)
>> +{
>> + return (struct sockaddr_in6 *) &rqst->rq_daddr;
>> +}
>> +
>> +static inline struct sockaddr *svc_daddr(const struct svc_rqst *rqst)
>> +{
>> + return (struct sockaddr *) &rqst->rq_daddr;
>> +}
>> +
>> /*
>> * Check buffer bounds after decoding arguments
>> */
>> @@ -340,7 +351,8 @@ struct svc_deferred_req {
>> struct svc_xprt *xprt;
>> struct sockaddr_storage addr; /* where reply must go */
>> size_t addrlen;
>> - union svc_addr_u daddr; /* where reply must come from */
>> + struct sockaddr_storage daddr; /* where reply must come from */
>> + size_t daddrlen;
>> struct cache_deferred_req handle;
>> size_t xprt_hlen;
>> int argslen;
>> diff --git a/net/sunrpc/svc_xprt.c b/net/sunrpc/svc_xprt.c
>> index bd31208..d86bb67 100644
>> --- a/net/sunrpc/svc_xprt.c
>> +++ b/net/sunrpc/svc_xprt.c
>> @@ -254,8 +254,6 @@ EXPORT_SYMBOL_GPL(svc_create_xprt);
>> */
>> void svc_xprt_copy_addrs(struct svc_rqst *rqstp, struct svc_xprt *xprt)
>> {
>> - struct sockaddr *sin;
>> -
>> memcpy(&rqstp->rq_addr, &xprt->xpt_remote, xprt->xpt_remotelen);
>> rqstp->rq_addrlen = xprt->xpt_remotelen;
>>
>> @@ -263,15 +261,8 @@ void svc_xprt_copy_addrs(struct svc_rqst *rqstp, struct svc_xprt *xprt)
>> * Destination address in request is needed for binding the
>> * source address in RPC replies/callbacks later.
>> */
>> - sin = (struct sockaddr *)&xprt->xpt_local;
>> - switch (sin->sa_family) {
>> - case AF_INET:
>> - rqstp->rq_daddr.addr = ((struct sockaddr_in *)sin)->sin_addr;
>> - break;
>> - case AF_INET6:
>> - rqstp->rq_daddr.addr6 = ((struct sockaddr_in6 *)sin)->sin6_addr;
>> - break;
>> - }
>> + memcpy(&rqstp->rq_daddr, &xprt->xpt_local, xprt->xpt_locallen);
>> + rqstp->rq_daddrlen = xprt->xpt_locallen;
>> }
>> EXPORT_SYMBOL_GPL(svc_xprt_copy_addrs);
>>
>> diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c
>> index 767d494..b9f4ad4 100644
>> --- a/net/sunrpc/svcsock.c
>> +++ b/net/sunrpc/svcsock.c
>> @@ -143,7 +143,8 @@ static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh)
>> cmh->cmsg_level = SOL_IP;
>> cmh->cmsg_type = IP_PKTINFO;
>> pki->ipi_ifindex = 0;
>> - pki->ipi_spec_dst.s_addr = rqstp->rq_daddr.addr.s_addr;
>> + pki->ipi_spec_dst.s_addr =
>> + svc_daddr_in(rqstp)->sin_addr.s_addr;
>> cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
>> }
>> break;
>> @@ -155,7 +156,7 @@ static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh)
>> cmh->cmsg_type = IPV6_PKTINFO;
>> pki->ipi6_ifindex = 0;
>> ipv6_addr_copy(&pki->ipi6_addr,
>> - &rqstp->rq_daddr.addr6);
>> + &svc_daddr_in6(rqstp)->sin6_addr);
>
> I kind of suspect more is needed here to deal with ipi6_ifindex.
>
>> cmh->cmsg_len = CMSG_LEN(sizeof(*pki));
>> }
>> break;
>> @@ -500,7 +501,7 @@ static int svc_udp_get_dest_address4(struct svc_rqst *rqstp,
>> struct in_pktinfo *pki = CMSG_DATA(cmh);
>> if (cmh->cmsg_type != IP_PKTINFO)
>> return 0;
>> - rqstp->rq_daddr.addr.s_addr = pki->ipi_spec_dst.s_addr;
>> + svc_daddr_in(rqstp)->sin_addr.s_addr = pki->ipi_spec_dst.s_addr;
>> return 1;
>> }
>>
>> @@ -513,7 +514,7 @@ static int svc_udp_get_dest_address6(struct svc_rqst *rqstp,
>> struct in6_pktinfo *pki = CMSG_DATA(cmh);
>> if (cmh->cmsg_type != IPV6_PKTINFO)
>> return 0;
>> - ipv6_addr_copy(&rqstp->rq_daddr.addr6, &pki->ipi6_addr);
>> + ipv6_addr_copy(&svc_daddr_in6(rqstp)->sin6_addr, &pki->ipi6_addr);
>
> Likewise, is the incoming interface index ignored when constructing svc_daddr_in6(rqstp) ?
Also, I can't seem to find where the address family field of svc_daddr() is being set.
>
>> return 1;
>> }
>>
>> --
>> 1.7.6
--
Chuck Lever
chuck[dot]lever[at]oracle[dot]com
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