diff options
Diffstat (limited to 'net/sunrpc/svc.c')
| -rw-r--r-- | net/sunrpc/svc.c | 42 |
1 files changed, 34 insertions, 8 deletions
diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c index 7c8070ec93c8..a08aeb56b8e4 100644 --- a/net/sunrpc/svc.c +++ b/net/sunrpc/svc.c @@ -11,7 +11,7 @@ */ #include <linux/linkage.h> -#include <linux/sched.h> +#include <linux/sched/signal.h> #include <linux/errno.h> #include <linux/net.h> #include <linux/in.h> @@ -385,7 +385,7 @@ static int svc_uses_rpcbind(struct svc_serv *serv) for (i = 0; i < progp->pg_nvers; i++) { if (progp->pg_vers[i] == NULL) continue; - if (progp->pg_vers[i]->vs_hidden == 0) + if (!progp->pg_vers[i]->vs_hidden) return 1; } } @@ -976,6 +976,13 @@ int svc_register(const struct svc_serv *serv, struct net *net, if (vers->vs_hidden) continue; + /* + * Don't register a UDP port if we need congestion + * control. + */ + if (vers->vs_need_cong_ctrl && proto == IPPROTO_UDP) + continue; + error = __svc_register(net, progp->pg_name, progp->pg_prog, i, family, proto, port); @@ -1155,8 +1162,7 @@ svc_process_common(struct svc_rqst *rqstp, struct kvec *argv, struct kvec *resv) case SVC_DENIED: goto err_bad_auth; case SVC_CLOSE: - if (test_bit(XPT_TEMP, &rqstp->rq_xprt->xpt_flags)) - svc_close_xprt(rqstp->rq_xprt); + goto close; case SVC_DROP: goto dropit; case SVC_COMPLETE: @@ -1170,6 +1176,21 @@ svc_process_common(struct svc_rqst *rqstp, struct kvec *argv, struct kvec *resv) !(versp = progp->pg_vers[vers])) goto err_bad_vers; + /* + * Some protocol versions (namely NFSv4) require some form of + * congestion control. (See RFC 7530 section 3.1 paragraph 2) + * In other words, UDP is not allowed. We mark those when setting + * up the svc_xprt, and verify that here. + * + * The spec is not very clear about what error should be returned + * when someone tries to access a server that is listening on UDP + * for lower versions. RPC_PROG_MISMATCH seems to be the closest + * fit. + */ + if (versp->vs_need_cong_ctrl && + !test_bit(XPT_CONG_CTRL, &rqstp->rq_xprt->xpt_flags)) + goto err_bad_vers; + procp = versp->vs_proc + proc; if (proc >= versp->vs_nproc || !procp->pc_func) goto err_bad_proc; @@ -1246,7 +1267,7 @@ svc_process_common(struct svc_rqst *rqstp, struct kvec *argv, struct kvec *resv) sendit: if (svc_authorise(rqstp)) - goto dropit; + goto close; return 1; /* Caller can now send it */ dropit: @@ -1254,11 +1275,16 @@ svc_process_common(struct svc_rqst *rqstp, struct kvec *argv, struct kvec *resv) dprintk("svc: svc_process dropit\n"); return 0; + close: + if (test_bit(XPT_TEMP, &rqstp->rq_xprt->xpt_flags)) + svc_close_xprt(rqstp->rq_xprt); + dprintk("svc: svc_process close\n"); + return 0; + err_short_len: - svc_printk(rqstp, "short len %Zd, dropping request\n", + svc_printk(rqstp, "short len %zd, dropping request\n", argv->iov_len); - - goto dropit; /* drop request */ + goto close; err_bad_rpc: serv->sv_stats->rpcbadfmt++; |