diff options
Diffstat (limited to 'net/sunrpc/svc.c')
| -rw-r--r-- | net/sunrpc/svc.c | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c index 2e22889a8837..b94efd93d3e4 100644 --- a/net/sunrpc/svc.c +++ b/net/sunrpc/svc.c @@ -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); @@ -1169,6 +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; |