From patchwork Fri Sep 5 13:08:10 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sreedhar Kodali X-Patchwork-Id: 4852011 Return-Path: X-Original-To: patchwork-linux-rdma@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 963C59F2EC for ; Fri, 5 Sep 2014 13:08:31 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 06268201F7 for ; Fri, 5 Sep 2014 13:08:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 04894201C0 for ; Fri, 5 Sep 2014 13:08:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932187AbaIENIP (ORCPT ); Fri, 5 Sep 2014 09:08:15 -0400 Received: from e9.ny.us.ibm.com ([32.97.182.139]:33230 "EHLO e9.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932083AbaIENIO (ORCPT ); Fri, 5 Sep 2014 09:08:14 -0400 Received: from /spool/local by e9.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Fri, 5 Sep 2014 09:08:12 -0400 Received: from b01cxnp22035.gho.pok.ibm.com (b01cxnp22035.gho.pok.ibm.com [9.57.198.25]) by d01dlp02.pok.ibm.com (Postfix) with ESMTP id 90DC76E8028 for ; Fri, 5 Sep 2014 09:07:59 -0400 (EDT) Received: from d01av02.pok.ibm.com (d01av02.pok.ibm.com [9.56.224.216]) by b01cxnp22035.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id s85D8BC251314746 for ; Fri, 5 Sep 2014 13:08:11 GMT Received: from d01av02.pok.ibm.com (localhost [127.0.0.1]) by d01av02.pok.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id s85D8AFV017716 for ; Fri, 5 Sep 2014 09:08:10 -0400 Received: from ltcweb.rtp.raleigh.ibm.com (ltcweb.rtp.raleigh.ibm.com [9.37.210.204]) by d01av02.pok.ibm.com (8.14.4/8.14.4/NCO v10.0 AVin) with ESMTP id s85D8AX7017691; Fri, 5 Sep 2014 09:08:10 -0400 Received: from ltc.linux.ibm.com (localhost.localdomain [127.0.0.1]) by ltcweb.rtp.raleigh.ibm.com (Postfix) with ESMTP id 4E777C0103; Fri, 5 Sep 2014 09:08:10 -0400 (EDT) MIME-Version: 1.0 Date: Fri, 05 Sep 2014 18:38:10 +0530 From: Sreedhar Kodali To: linux-rdma@vger.kernel.org Cc: sean.hefty@intel.com, pradeeps@linux.vnet.ibm.com Subject: [PATCH v2 1/4] rsockets: fine grained interception mechanism for rsocket preloading Message-ID: X-Sender: srkodali@linux.vnet.ibm.com User-Agent: Roundcube Webmail/1.0.1 X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 14090513-7182-0000-0000-0000005F8994 Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org X-Spam-Status: No, score=-8.6 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Sreedhar Kodali By default the R-Sockets pre-loading library intercepts all the stream and datagram sockets belonging to a launched program processes and threads. However, distributed application and database servers may require fine grained interception to ensure that only the processes which are listening for remote connections on the RDMA transport need to be enabled with RDMA while remaining can continue to use TCP as before. This allows proper communication happening between various server components locally. A configuration file based mechanism is introduced to facilitate this fine grained interception mechanism. As part of preload initialization, the configuration file is scanned and an in-memory record store is created with all the entries found. When a request is made to intercept a socket, its attributes are cross checked with stored records to see whether we should proceed with rsocket switch over. Note: Right now, the fine grained interception mechanism is enabled only for newly created sockets. Going forward, this can be extened to select connections based on the specified host/IP addresses and ports as well. "preload_config" is the name of the configuration file which should exist in the default configuration location (usually the full path to this configuration file is: /etc/rdma/rsocket/preload_config) of an installed rsocket library. The sample format for this configuration file is shown below: @# @# Sample config file for preloading in a program specific way @# @# Each line entry should have the following format: @# @# prog_name dom_spec type_spec proto_spec @# @# where, @# @# prog_name - program or command name (string without spaces) @# dom_spec - one or more socket domain strings separated by commas @# - format: {*|domain,[,domain,...]} @# - '*' means any valid domain @# - valid domains: inet/inet6/ib @# type_spec - one or more socket type strings separated by commas @# - format: {*|type[,type,...]} @# - '*' means any valid type @# - valid types: stream/dgram @# proto_spec - one or more socket protocol strings separated by commas @# - format: {*|protocol[,protocol,...]} @# - '*' means any valid protocol @# - valid protocols: tcp/udp @# - one ore more tab or space characters @# @# Note: @# Lines beginning with '#' character are treated as comments. @# Comments at the end of an entry are allowed and should be preceded @# by '#' character. @# Blank lines are ignored. @ @progA inet stream tcp # intercept progA's internet stream sockets @progB inet6 dgram udp # intercept progB's ipv6 datagram sockets @progC * * * # intercept progC's sockets Signed-off-by: Sreedhar Kodali Reviewed-by: Pradeep Satyanarayana --- + /* entry matched */ + return 1; +} + static int fd_open(void) { struct fd_info *fdi; @@ -308,6 +514,14 @@ static void init_preload(void) rs.fcntl = dlsym(RTLD_DEFAULT, "rfcntl"); getenv_options(); + + if (scan_preload_config() == 0) { + config_avail = 1; + } + if (entryp) { + atexit(free_preload_config); + } + init = 1; out: pthread_mutex_unlock(&mut); @@ -404,10 +618,15 @@ int socket(int domain, int type, int protocol) static __thread int recursive; int index, ret; + init_preload(); + + if (config_avail && intercept_socket(domain, type, protocol) == 0) { + goto real; + } + if (recursive) goto real; - init_preload(); index = fd_open(); if (index < 0) return index; --- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/src/preload.c b/src/preload.c index fb2149b..7330a38 100644 --- a/src/preload.c +++ b/src/preload.c @@ -50,6 +50,8 @@ #include #include #include +#include +#include #include #include @@ -122,6 +124,210 @@ struct fd_info { atomic_t refcnt; }; +typedef struct { + char *name; + uint32_t domain; + uint32_t type; + uint32_t protocol; +} config_entry_t; + +static config_entry_t *entryp; +static int16_t nentries; +static int16_t config_avail; +extern char *program_invocation_short_name; + +/* scan preload configuration file and create + * in-memory config store + * should be called only once under lock + */ +static int scan_preload_config(void) +{ + FILE *fp; + char line[512]; + char *lp, *cp, *str1, *str2; + char *token, *subtoken, *saveptr1, *saveptr2; + int i, j, ret = 0; + + fp = fopen(RS_CONF_DIR "/preload_config", "r"); + if (fp == NULL) { + return -1; + } + + while ((lp = fgets(line, sizeof(line), fp)) != NULL) { + + /* trim white space at the beginning of each line */ + while (*lp != '\0') { + if (isspace(*lp)) { + lp++; + continue; + } else { + break; + } + } + + /* skip comment and blank lines */ + if (*lp == '\0' || *lp == '#') { + continue; + } + + /* trim comments and newlines at the end of each line */ + if ((cp = strpbrk(lp, "#\n")) != NULL) { + *cp = '\0'; + } + + /* now allocate memory for new configuration entry */ + entryp = (config_entry_t *) realloc(entryp, (nentries + 1) * sizeof(config_entry_t)); + if (!entryp) { + ret = -1; + goto scan_done; + } + memset(entryp + nentries, '\0', sizeof(config_entry_t)); + + /* tokenize the retrieved line and parse individual fields */ + for (i = 1, str1 = lp; ; i++, str1 = NULL) { + token = strtok_r(str1, " \t", &saveptr1); + if (token == NULL) { + break; + } + + /* first field should contain program name */ + if (i == 1) { + entryp[nentries].name = (char *) malloc((strlen(token) + 1)); + if (!entryp[nentries].name) { + ret = -1; + goto scan_done; + } + memcpy(entryp[nentries].name, token, strlen(token) + 1); + continue; + } + + /* second field onwards can contain multiple entries separate by comma */ + for (j = 1, str2 = token; ; j++, str2 = NULL) { + subtoken = strtok_r(str2, ",", &saveptr2); + if (subtoken == NULL) { + break; + } + + /* second field is socket domain + * rsocket currently recognizes only AF_INET, AF_INET6 and AF_IB domains + * '*' implies all the valid domains + */ + if (i == 2) { + if (*subtoken == '*') { + entryp[nentries].domain |= (1 << AF_INET); + entryp[nentries].domain |= (1 << AF_INET6); + entryp[nentries].domain |= (1 << AF_IB); + break; + } else if (strcmp(subtoken, "inet6") == 0) { + entryp[nentries].domain |= (1 << AF_INET6); + } else if (strcmp(subtoken, "inet") == 0) { + entryp[nentries].domain |= (1 << AF_INET); + } else if (strcmp(subtoken, "ib") == 0) { + entryp[nentries].domain |= (1 << AF_IB); + } + continue; + } + + /* third field is socket type + * rsocket currently recognizes only SOCK_STREAM and SOCK_DGRAM types + * '*' implies all the valid types + */ + if (i == 3) { + if (*subtoken == '*') { + entryp[nentries].type |= (1 << SOCK_STREAM); + entryp[nentries].type |= (1 << SOCK_DGRAM); + break; + } else if (strcmp(subtoken, "stream") == 0) { + entryp[nentries].type |= (1 << SOCK_STREAM); + } else if (strcmp(subtoken, "dgram") == 0) { + entryp[nentries].type |= (1 << SOCK_DGRAM); + } + continue; + } + + /* fourth field is socket protocol + * rsocket currently recgonizes only IPPROTO_TCP and IPPROTO_UDP protocols + * '*' implies all the valid protocols + */ + if (i == 4) { + if (*subtoken == '*') { + entryp[nentries].protocol |= (1 << IPPROTO_TCP); + entryp[nentries].protocol |= (1 << IPPROTO_UDP); + break; + } else if (strcmp(subtoken, "tcp") == 0) { + entryp[nentries].protocol |= (1 << IPPROTO_TCP); + } else if (strcmp(subtoken, "udp") == 0) { + entryp[nentries].protocol |= (1 << IPPROTO_UDP); + } + continue; + } + } + } + nentries += 1; + } + +scan_done: + fclose(fp); + return ret; +} + +/* free in-memory config store + * should be called only once during finalization + */ +static void free_preload_config(void) +{ + int i; + + if (entryp) { + for (i = 0; i < nentries; i++) { + if (entryp[i].name) { + free(entryp[i].name); + } + } + free(entryp); + } + + return; +} + +/* check whether interception is required for this socket + * compares the provided attributes with that available in the in-memory + * data store for the current process + * sets-up in-memory config store if it's already not done + */ +static int intercept_socket(int domain, int type, int protocol) +{ + int i; + + /* locate the config entry */ + for (i = 0; i < nentries; i++) { + if (strncmp(entryp[i].name, program_invocation_short_name, strlen(entryp[i].name)) == 0) { + break; + } + } + if (i == nentries) { + return 0; + } + + /* match domain field */ + if (!(entryp[i].domain & (1 << domain))) { + return 0; + } + + /* match type field */ + if (!(entryp[i].type & (1 << type))) { + return 0; + } + + /* match protocol field only if protocol is specified */ + if (protocol && !(entryp[i].protocol & (1 << protocol))) { + return 0; + } +