/* * AF_INET/AF_INET6 SOCK_STREAM protocol layer (tcp) * * Copyright 2000-2010 Willy Tarreau * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef CONFIG_HAP_CTTPROXY #include #endif static int tcp_bind_listeners(struct protocol *proto); /* Note: must not be declared as its list will be overwritten */ static struct protocol proto_tcpv4 = { .name = "tcpv4", .sock_domain = AF_INET, .sock_type = SOCK_STREAM, .sock_prot = IPPROTO_TCP, .sock_family = AF_INET, .sock_addrlen = sizeof(struct sockaddr_in), .l3_addrlen = 32/8, .accept = &stream_sock_accept, .read = &stream_sock_read, .write = &stream_sock_write, .bind_all = tcp_bind_listeners, .unbind_all = unbind_all_listeners, .enable_all = enable_all_listeners, .listeners = LIST_HEAD_INIT(proto_tcpv4.listeners), .nb_listeners = 0, }; /* Note: must not be declared as its list will be overwritten */ static struct protocol proto_tcpv6 = { .name = "tcpv6", .sock_domain = AF_INET6, .sock_type = SOCK_STREAM, .sock_prot = IPPROTO_TCP, .sock_family = AF_INET6, .sock_addrlen = sizeof(struct sockaddr_in6), .l3_addrlen = 128/8, .accept = &stream_sock_accept, .read = &stream_sock_read, .write = &stream_sock_write, .bind_all = tcp_bind_listeners, .unbind_all = unbind_all_listeners, .enable_all = enable_all_listeners, .listeners = LIST_HEAD_INIT(proto_tcpv6.listeners), .nb_listeners = 0, }; /* Binds ipv4 address to socket , unless is set, in which * case we try to bind . is a 2-bit field consisting of : * - 0 : ignore remote address (may even be a NULL pointer) * - 1 : use provided address * - 2 : use provided port * - 3 : use both * * The function supports multiple foreign binding methods : * - linux_tproxy: we directly bind to the foreign address * - cttproxy: we bind to a local address then nat. * The second one can be used as a fallback for the first one. * This function returns 0 when everything's OK, 1 if it could not bind, to the * local address, 2 if it could not bind to the foreign address. */ int tcpv4_bind_socket(int fd, int flags, struct sockaddr_in *local, struct sockaddr_in *remote) { struct sockaddr_in bind_addr; int foreign_ok = 0; int ret; #ifdef CONFIG_HAP_LINUX_TPROXY static int ip_transp_working = 1; if (flags && ip_transp_working) { if (setsockopt(fd, SOL_IP, IP_TRANSPARENT, (char *) &one, sizeof(one)) == 0 || setsockopt(fd, SOL_IP, IP_FREEBIND, (char *) &one, sizeof(one)) == 0) foreign_ok = 1; else ip_transp_working = 0; } #endif if (flags) { memset(&bind_addr, 0, sizeof(bind_addr)); if (flags & 1) bind_addr.sin_addr = remote->sin_addr; if (flags & 2) bind_addr.sin_port = remote->sin_port; } setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *) &one, sizeof(one)); if (foreign_ok) { ret = bind(fd, (struct sockaddr *)&bind_addr, sizeof(bind_addr)); if (ret < 0) return 2; } else { ret = bind(fd, (struct sockaddr *)local, sizeof(*local)); if (ret < 0) return 1; } if (!flags) return 0; #ifdef CONFIG_HAP_CTTPROXY if (!foreign_ok) { struct in_tproxy itp1, itp2; memset(&itp1, 0, sizeof(itp1)); itp1.op = TPROXY_ASSIGN; itp1.v.addr.faddr = bind_addr.sin_addr; itp1.v.addr.fport = bind_addr.sin_port; /* set connect flag on socket */ itp2.op = TPROXY_FLAGS; itp2.v.flags = ITP_CONNECT | ITP_ONCE; if (setsockopt(fd, SOL_IP, IP_TPROXY, &itp1, sizeof(itp1)) != -1 && setsockopt(fd, SOL_IP, IP_TPROXY, &itp2, sizeof(itp2)) != -1) { foreign_ok = 1; } } #endif if (!foreign_ok) /* we could not bind to a foreign address */ return 2; return 0; } /* * This function initiates a connection to the server assigned to this session * (s->srv, s->srv_addr). It will assign a server if none is assigned yet. A * source address may be pointed to by . Note that this is only used * in case of transparent proxying. Normal source bind addresses are still * determined locally (due to the possible need of a source port). * * It can return one of : * - SN_ERR_NONE if everything's OK * - SN_ERR_SRVTO if there are no more servers * - SN_ERR_SRVCL if the connection was refused by the server * - SN_ERR_PRXCOND if the connection has been limited by the proxy (maxconn) * - SN_ERR_RESOURCE if a system resource is lacking (eg: fd limits, ports, ...) * - SN_ERR_INTERNAL for any other purely internal errors * Additionnally, in the case of SN_ERR_RESOURCE, an emergency log will be emitted. */ int tcpv4_connect_server(struct stream_interface *si, struct proxy *be, struct server *srv, struct sockaddr *srv_addr, struct sockaddr *from_addr) { int fd; if ((fd = si->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1) { qfprintf(stderr, "Cannot get a server socket.\n"); if (errno == ENFILE) send_log(be, LOG_EMERG, "Proxy %s reached system FD limit at %d. Please check system tunables.\n", be->id, maxfd); else if (errno == EMFILE) send_log(be, LOG_EMERG, "Proxy %s reached process FD limit at %d. Please check 'ulimit-n' and restart.\n", be->id, maxfd); else if (errno == ENOBUFS || errno == ENOMEM) send_log(be, LOG_EMERG, "Proxy %s reached system memory limit at %d sockets. Please check system tunables.\n", be->id, maxfd); /* this is a resource error */ return SN_ERR_RESOURCE; } if (fd >= global.maxsock) { /* do not log anything there, it's a normal condition when this option * is used to serialize connections to a server ! */ Alert("socket(): not enough free sockets. Raise -n argument. Giving up.\n"); close(fd); return SN_ERR_PRXCOND; /* it is a configuration limit */ } if ((fcntl(fd, F_SETFL, O_NONBLOCK)==-1) || (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *) &one, sizeof(one)) == -1)) { qfprintf(stderr,"Cannot set client socket to non blocking mode.\n"); close(fd); return SN_ERR_INTERNAL; } if (be->options & PR_O_TCP_SRV_KA) setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (char *) &one, sizeof(one)); if (be->options & PR_O_TCP_NOLING) setsockopt(fd, SOL_SOCKET, SO_LINGER, (struct linger *) &nolinger, sizeof(struct linger)); /* allow specific binding : * - server-specific at first * - proxy-specific next */ if (srv != NULL && srv->state & SRV_BIND_SRC) { int ret, flags = 0; switch (srv->state & SRV_TPROXY_MASK) { case SRV_TPROXY_ADDR: case SRV_TPROXY_CLI: flags = 3; break; case SRV_TPROXY_CIP: case SRV_TPROXY_DYN: flags = 1; break; } #ifdef SO_BINDTODEVICE /* Note: this might fail if not CAP_NET_RAW */ if (srv->iface_name) setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, srv->iface_name, srv->iface_len + 1); #endif if (srv->sport_range) { int attempts = 10; /* should be more than enough to find a spare port */ struct sockaddr_in src; ret = 1; src = srv->source_addr; do { /* note: in case of retry, we may have to release a previously * allocated port, hence this loop's construct. */ port_range_release_port(fdinfo[fd].port_range, fdinfo[fd].local_port); fdinfo[fd].port_range = NULL; if (!attempts) break; attempts--; fdinfo[fd].local_port = port_range_alloc_port(srv->sport_range); if (!fdinfo[fd].local_port) break; fdinfo[fd].port_range = srv->sport_range; src.sin_port = htons(fdinfo[fd].local_port); ret = tcpv4_bind_socket(fd, flags, &src, (struct sockaddr_in *)from_addr); } while (ret != 0); /* binding NOK */ } else { ret = tcpv4_bind_socket(fd, flags, &srv->source_addr, (struct sockaddr_in *)from_addr); } if (ret) { port_range_release_port(fdinfo[fd].port_range, fdinfo[fd].local_port); fdinfo[fd].port_range = NULL; close(fd); if (ret == 1) { Alert("Cannot bind to source address before connect() for server %s/%s. Aborting.\n", be->id, srv->id); send_log(be, LOG_EMERG, "Cannot bind to source address before connect() for server %s/%s.\n", be->id, srv->id); } else { Alert("Cannot bind to tproxy source address before connect() for server %s/%s. Aborting.\n", be->id, srv->id); send_log(be, LOG_EMERG, "Cannot bind to tproxy source address before connect() for server %s/%s.\n", be->id, srv->id); } return SN_ERR_RESOURCE; } } else if (be->options & PR_O_BIND_SRC) { int ret, flags = 0; switch (be->options & PR_O_TPXY_MASK) { case PR_O_TPXY_ADDR: case PR_O_TPXY_CLI: flags = 3; break; case PR_O_TPXY_CIP: case PR_O_TPXY_DYN: flags = 1; break; } #ifdef SO_BINDTODEVICE /* Note: this might fail if not CAP_NET_RAW */ if (be->iface_name) setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, be->iface_name, be->iface_len + 1); #endif ret = tcpv4_bind_socket(fd, flags, &be->source_addr, (struct sockaddr_in *)from_addr); if (ret) { close(fd); if (ret == 1) { Alert("Cannot bind to source address before connect() for proxy %s. Aborting.\n", be->id); send_log(be, LOG_EMERG, "Cannot bind to source address before connect() for proxy %s.\n", be->id); } else { Alert("Cannot bind to tproxy source address before connect() for proxy %s. Aborting.\n", be->id); send_log(be, LOG_EMERG, "Cannot bind to tproxy source address before connect() for proxy %s.\n", be->id); } return SN_ERR_RESOURCE; } } #if defined(TCP_QUICKACK) /* disabling tcp quick ack now allows the first request to leave the * machine with the first ACK. We only do this if there are pending * data in the buffer. */ if ((be->options2 & PR_O2_SMARTCON) && si->ob->send_max) setsockopt(fd, IPPROTO_TCP, TCP_QUICKACK, (char *) &zero, sizeof(zero)); #endif if (global.tune.server_sndbuf) setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &global.tune.server_sndbuf, sizeof(global.tune.server_sndbuf)); if (global.tune.server_rcvbuf) setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &global.tune.server_rcvbuf, sizeof(global.tune.server_rcvbuf)); if ((connect(fd, (struct sockaddr *)srv_addr, sizeof(struct sockaddr_in)) == -1) && (errno != EINPROGRESS) && (errno != EALREADY) && (errno != EISCONN)) { if (errno == EAGAIN || errno == EADDRINUSE) { char *msg; if (errno == EAGAIN) /* no free ports left, try again later */ msg = "no free ports"; else msg = "local address already in use"; qfprintf(stderr,"Cannot connect: %s.\n",msg); port_range_release_port(fdinfo[fd].port_range, fdinfo[fd].local_port); fdinfo[fd].port_range = NULL; close(fd); send_log(be, LOG_EMERG, "Connect() failed for server %s/%s: %s.\n", be->id, srv->id, msg); return SN_ERR_RESOURCE; } else if (errno == ETIMEDOUT) { //qfprintf(stderr,"Connect(): ETIMEDOUT"); port_range_release_port(fdinfo[fd].port_range, fdinfo[fd].local_port); fdinfo[fd].port_range = NULL; close(fd); return SN_ERR_SRVTO; } else { // (errno == ECONNREFUSED || errno == ENETUNREACH || errno == EACCES || errno == EPERM) //qfprintf(stderr,"Connect(): %d", errno); port_range_release_port(fdinfo[fd].port_range, fdinfo[fd].local_port); fdinfo[fd].port_range = NULL; close(fd); return SN_ERR_SRVCL; } } fdtab[fd].owner = si; fdtab[fd].state = FD_STCONN; /* connection in progress */ fdtab[fd].flags = FD_FL_TCP | FD_FL_TCP_NODELAY; fdtab[fd].cb[DIR_RD].f = &stream_sock_read; fdtab[fd].cb[DIR_RD].b = si->ib; fdtab[fd].cb[DIR_WR].f = &stream_sock_write; fdtab[fd].cb[DIR_WR].b = si->ob; fdinfo[fd].peeraddr = (struct sockaddr *)srv_addr; fdinfo[fd].peerlen = sizeof(struct sockaddr_in); fd_insert(fd); EV_FD_SET(fd, DIR_WR); /* for connect status */ si->state = SI_ST_CON; si->flags |= SI_FL_CAP_SPLTCP; /* TCP supports splicing */ si->exp = tick_add_ifset(now_ms, be->timeout.connect); return SN_ERR_NONE; /* connection is OK */ } /* This function tries to bind a TCPv4/v6 listener. It may return a warning or * an error message in if the message is at most bytes long * (including '\0'). The return value is composed from ERR_ABORT, ERR_WARN, * ERR_ALERT, ERR_RETRYABLE and ERR_FATAL. ERR_NONE indicates that everything * was alright and that no message was returned. ERR_RETRYABLE means that an * error occurred but that it may vanish after a retry (eg: port in use), and * ERR_FATAL indicates a non-fixable error.ERR_WARN and ERR_ALERT do not alter * the meaning of the error, but just indicate that a message is present which * should be displayed with the respective level. Last, ERR_ABORT indicates * that it's pointless to try to start other listeners. No error message is * returned if errlen is NULL. */ int tcp_bind_listener(struct listener *listener, char *errmsg, int errlen) { __label__ tcp_return, tcp_close_return; int fd, err; const char *msg = NULL; /* ensure we never return garbage */ if (errmsg && errlen) *errmsg = 0; if (listener->state != LI_ASSIGNED) return ERR_NONE; /* already bound */ err = ERR_NONE; if ((fd = socket(listener->addr.ss_family, SOCK_STREAM, IPPROTO_TCP)) == -1) { err |= ERR_RETRYABLE | ERR_ALERT; msg = "cannot create listening socket"; goto tcp_return; } if (fd >= global.maxsock) { err |= ERR_FATAL | ERR_ABORT | ERR_ALERT; msg = "not enough free sockets (raise '-n' parameter)"; goto tcp_close_return; } if (fcntl(fd, F_SETFL, O_NONBLOCK) == -1) { err |= ERR_FATAL | ERR_ALERT; msg = "cannot make socket non-blocking"; goto tcp_close_return; } if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *) &one, sizeof(one)) == -1) { /* not fatal but should be reported */ msg = "cannot do so_reuseaddr"; err |= ERR_ALERT; } if (listener->options & LI_O_NOLINGER) setsockopt(fd, SOL_SOCKET, SO_LINGER, (struct linger *) &nolinger, sizeof(struct linger)); #ifdef SO_REUSEPORT /* OpenBSD supports this. As it's present in old libc versions of Linux, * it might return an error that we will silently ignore. */ setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, (char *) &one, sizeof(one)); #endif #ifdef CONFIG_HAP_LINUX_TPROXY if ((listener->options & LI_O_FOREIGN) && (setsockopt(fd, SOL_IP, IP_TRANSPARENT, (char *) &one, sizeof(one)) == -1) && (setsockopt(fd, SOL_IP, IP_FREEBIND, (char *) &one, sizeof(one)) == -1)) { msg = "cannot make listening socket transparent"; err |= ERR_ALERT; } #endif #ifdef SO_BINDTODEVICE /* Note: this might fail if not CAP_NET_RAW */ if (listener->interface) { if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, listener->interface, strlen(listener->interface) + 1) == -1) { msg = "cannot bind listener to device"; err |= ERR_WARN; } } #endif #if defined(TCP_MAXSEG) if (listener->maxseg) { if (setsockopt(fd, IPPROTO_TCP, TCP_MAXSEG, &listener->maxseg, sizeof(listener->maxseg)) == -1) { msg = "cannot set MSS"; err |= ERR_WARN; } } #endif #if defined(TCP_DEFER_ACCEPT) if (listener->options & LI_O_DEF_ACCEPT) { /* defer accept by up to one second */ int accept_delay = 1; if (setsockopt(fd, IPPROTO_TCP, TCP_DEFER_ACCEPT, &accept_delay, sizeof(accept_delay)) == -1) { msg = "cannot enable DEFER_ACCEPT"; err |= ERR_WARN; } } #endif if (bind(fd, (struct sockaddr *)&listener->addr, listener->proto->sock_addrlen) == -1) { err |= ERR_RETRYABLE | ERR_ALERT; msg = "cannot bind socket"; goto tcp_close_return; } if (listen(fd, listener->backlog ? listener->backlog : listener->maxconn) == -1) { err |= ERR_RETRYABLE | ERR_ALERT; msg = "cannot listen to socket"; goto tcp_close_return; } #if defined(TCP_QUICKACK) if (listener->options & LI_O_NOQUICKACK) setsockopt(fd, IPPROTO_TCP, TCP_QUICKACK, (char *) &zero, sizeof(zero)); #endif /* the socket is ready */ listener->fd = fd; listener->state = LI_LISTEN; fdtab[fd].owner = listener; /* reference the listener instead of a task */ fdtab[fd].state = FD_STLISTEN; fdtab[fd].flags = FD_FL_TCP | ((listener->options & LI_O_NOLINGER) ? FD_FL_TCP_NOLING : 0); fdtab[fd].cb[DIR_RD].f = listener->proto->accept; fdtab[fd].cb[DIR_WR].f = NULL; /* never called */ fdtab[fd].cb[DIR_RD].b = fdtab[fd].cb[DIR_WR].b = NULL; fdinfo[fd].peeraddr = NULL; fdinfo[fd].peerlen = 0; fd_insert(fd); tcp_return: if (msg && errlen) strlcpy2(errmsg, msg, errlen); return err; tcp_close_return: close(fd); goto tcp_return; } /* This function creates all TCP sockets bound to the protocol entry . * It is intended to be used as the protocol's bind_all() function. * The sockets will be registered but not added to any fd_set, in order not to * loose them across the fork(). A call to enable_all_listeners() is needed * to complete initialization. The return value is composed from ERR_*. */ static int tcp_bind_listeners(struct protocol *proto) { struct listener *listener; int err = ERR_NONE; list_for_each_entry(listener, &proto->listeners, proto_list) { err |= tcp_bind_listener(listener, NULL, 0); if ((err & ERR_CODE) == ERR_ABORT) break; } return err; } /* Add listener to the list of tcpv4 listeners. The listener's state * is automatically updated from LI_INIT to LI_ASSIGNED. The number of * listeners is updated. This is the function to use to add a new listener. */ void tcpv4_add_listener(struct listener *listener) { if (listener->state != LI_INIT) return; listener->state = LI_ASSIGNED; listener->proto = &proto_tcpv4; LIST_ADDQ(&proto_tcpv4.listeners, &listener->proto_list); proto_tcpv4.nb_listeners++; } /* Add listener to the list of tcpv4 listeners. The listener's state * is automatically updated from LI_INIT to LI_ASSIGNED. The number of * listeners is updated. This is the function to use to add a new listener. */ void tcpv6_add_listener(struct listener *listener) { if (listener->state != LI_INIT) return; listener->state = LI_ASSIGNED; listener->proto = &proto_tcpv6; LIST_ADDQ(&proto_tcpv6.listeners, &listener->proto_list); proto_tcpv6.nb_listeners++; } /* This function performs the TCP request analysis on the current request. It * returns 1 if the processing can continue on next analysers, or zero if it * needs more data, encounters an error, or wants to immediately abort the * request. It relies on buffers flags, and updates s->req->analysers. The * function may be called for frontend rules and backend rules. It only relies * on the backend pointer so this works for both cases. */ int tcp_inspect_request(struct session *s, struct buffer *req, int an_bit) { struct tcp_rule *rule; struct stksess *ts; struct stktable *t; int partial; DPRINTF(stderr,"[%u] %s: session=%p b=%p, exp(r,w)=%u,%u bf=%08x bl=%d analysers=%02x\n", now_ms, __FUNCTION__, s, req, req->rex, req->wex, req->flags, req->l, req->analysers); /* We don't know whether we have enough data, so must proceed * this way : * - iterate through all rules in their declaration order * - if one rule returns MISS, it means the inspect delay is * not over yet, then return immediately, otherwise consider * it as a non-match. * - if one rule returns OK, then return OK * - if one rule returns KO, then return KO */ if (req->flags & (BF_SHUTR|BF_FULL) || !s->be->tcp_req.inspect_delay || tick_is_expired(req->analyse_exp, now_ms)) partial = 0; else partial = ACL_PARTIAL; list_for_each_entry(rule, &s->be->tcp_req.inspect_rules, list) { int ret = ACL_PAT_PASS; if (rule->cond) { ret = acl_exec_cond(rule->cond, s->be, s, &s->txn, ACL_DIR_REQ | partial); if (ret == ACL_PAT_MISS) { buffer_dont_connect(req); /* just set the request timeout once at the beginning of the request */ if (!tick_isset(req->analyse_exp) && s->be->tcp_req.inspect_delay) req->analyse_exp = tick_add_ifset(now_ms, s->be->tcp_req.inspect_delay); return 0; } ret = acl_pass(ret); if (rule->cond->pol == ACL_COND_UNLESS) ret = !ret; } if (ret) { /* we have a matching rule. */ if (rule->action == TCP_ACT_REJECT) { buffer_abort(req); buffer_abort(s->rep); req->analysers = 0; s->be->counters.denied_req++; if (s->listener->counters) s->listener->counters->denied_req++; if (!(s->flags & SN_ERR_MASK)) s->flags |= SN_ERR_PRXCOND; if (!(s->flags & SN_FINST_MASK)) s->flags |= SN_FINST_R; return 0; } else if (rule->action == TCP_ACT_TRK_SC1) { if (!s->stkctr1_entry) { /* only the first valid track-sc1 directive applies. * Also, note that right now we can only track SRC so we * don't check how to get the key, but later we may need * to consider rule->act_prm->trk_ctr.type. */ t = rule->act_prm.trk_ctr.table.t; ts = stktable_get_entry(t, tcpv4_src_to_stktable_key(s)); if (ts) { session_track_stkctr1(s, t, ts); if (s->fe != s->be) s->flags |= SN_BE_TRACK_SC1; } } } else if (rule->action == TCP_ACT_TRK_SC2) { if (!s->stkctr2_entry) { /* only the first valid track-sc2 directive applies. * Also, note that right now we can only track SRC so we * don't check how to get the key, but later we may need * to consider rule->act_prm->trk_ctr.type. */ t = rule->act_prm.trk_ctr.table.t; ts = stktable_get_entry(t, tcpv4_src_to_stktable_key(s)); if (ts) { session_track_stkctr2(s, t, ts); if (s->fe != s->be) s->flags |= SN_BE_TRACK_SC2; } } } else { /* otherwise accept */ break; } } } /* if we get there, it means we have no rule which matches, or * we have an explicit accept, so we apply the default accept. */ req->analysers &= ~an_bit; req->analyse_exp = TICK_ETERNITY; return 1; } /* This function performs the TCP layer4 analysis on the current request. It * returns 0 if a reject rule matches, otherwise 1 if either an accept rule * matches or if no more rule matches. It can only use rules which don't need * any data. */ int tcp_exec_req_rules(struct session *s) { struct tcp_rule *rule; struct stksess *ts; struct stktable *t = NULL; int result = 1; int ret; list_for_each_entry(rule, &s->fe->tcp_req.l4_rules, list) { ret = ACL_PAT_PASS; if (rule->cond) { ret = acl_exec_cond(rule->cond, s->fe, s, NULL, ACL_DIR_REQ); ret = acl_pass(ret); if (rule->cond->pol == ACL_COND_UNLESS) ret = !ret; } if (ret) { /* we have a matching rule. */ if (rule->action == TCP_ACT_REJECT) { s->fe->counters.denied_conn++; if (s->listener->counters) s->listener->counters->denied_conn++; if (!(s->flags & SN_ERR_MASK)) s->flags |= SN_ERR_PRXCOND; if (!(s->flags & SN_FINST_MASK)) s->flags |= SN_FINST_R; result = 0; break; } else if (rule->action == TCP_ACT_TRK_SC1) { if (!s->stkctr1_entry) { /* only the first valid track-sc1 directive applies. * Also, note that right now we can only track SRC so we * don't check how to get the key, but later we may need * to consider rule->act_prm->trk_ctr.type. */ t = rule->act_prm.trk_ctr.table.t; ts = stktable_get_entry(t, tcpv4_src_to_stktable_key(s)); if (ts) session_track_stkctr1(s, t, ts); } } else if (rule->action == TCP_ACT_TRK_SC2) { if (!s->stkctr2_entry) { /* only the first valid track-sc2 directive applies. * Also, note that right now we can only track SRC so we * don't check how to get the key, but later we may need * to consider rule->act_prm->trk_ctr.type. */ t = rule->act_prm.trk_ctr.table.t; ts = stktable_get_entry(t, tcpv4_src_to_stktable_key(s)); if (ts) session_track_stkctr2(s, t, ts); } } else { /* otherwise it's an accept */ break; } } } return result; } /* Parse a tcp-request rule. Return a negative value in case of failure */ static int tcp_parse_request_rule(char **args, int arg, int section_type, struct proxy *curpx, struct proxy *defpx, struct tcp_rule *rule, char *err, int errlen) { if (curpx == defpx) { snprintf(err, errlen, "%s %s is not allowed in 'defaults' sections", args[0], args[1]); return -1; } if (!strcmp(args[arg], "accept")) { arg++; rule->action = TCP_ACT_ACCEPT; } else if (!strcmp(args[arg], "reject")) { arg++; rule->action = TCP_ACT_REJECT; } else if (strcmp(args[arg], "track-sc1") == 0) { int ret; arg++; ret = parse_track_counters(args, &arg, section_type, curpx, &rule->act_prm.trk_ctr, defpx, err, errlen); if (ret < 0) /* nb: warnings are not handled yet */ return -1; rule->action = TCP_ACT_TRK_SC1; } else if (strcmp(args[arg], "track-sc2") == 0) { int ret; arg++; ret = parse_track_counters(args, &arg, section_type, curpx, &rule->act_prm.trk_ctr, defpx, err, errlen); if (ret < 0) /* nb: warnings are not handled yet */ return -1; rule->action = TCP_ACT_TRK_SC2; } else { snprintf(err, errlen, "'%s %s' expects 'accept', 'reject', 'track-sc1' " "or 'track-sc2' in %s '%s' (was '%s')", args[0], args[1], proxy_type_str(curpx), curpx->id, args[arg]); return -1; } if (strcmp(args[arg], "if") == 0 || strcmp(args[arg], "unless") == 0) { if ((rule->cond = build_acl_cond(NULL, 0, curpx, (const char **)args+arg)) == NULL) { snprintf(err, errlen, "error detected in %s '%s' while parsing '%s' condition", proxy_type_str(curpx), curpx->id, args[arg]); return -1; } } else if (*args[arg]) { snprintf(err, errlen, "'%s %s %s' only accepts 'if' or 'unless', in %s '%s' (was '%s')", args[0], args[1], args[2], proxy_type_str(curpx), curpx->id, args[arg]); return -1; } return 0; } /* This function should be called to parse a line starting with the "tcp-request" * keyword. */ static int tcp_parse_tcp_req(char **args, int section_type, struct proxy *curpx, struct proxy *defpx, char *err, int errlen) { const char *ptr = NULL; unsigned int val; int retlen; int warn = 0; int arg; struct tcp_rule *rule; if (!*args[1]) { snprintf(err, errlen, "missing argument for '%s' in %s '%s'", args[0], proxy_type_str(curpx), curpx->id); return -1; } if (!strcmp(args[1], "inspect-delay")) { if (curpx == defpx) { snprintf(err, errlen, "%s %s is not allowed in 'defaults' sections", args[0], args[1]); return -1; } if (!*args[2] || (ptr = parse_time_err(args[2], &val, TIME_UNIT_MS))) { retlen = snprintf(err, errlen, "'%s %s' expects a positive delay in milliseconds, in %s '%s'", args[0], args[1], proxy_type_str(curpx), curpx->id); if (ptr && retlen < errlen) retlen += snprintf(err+retlen, errlen - retlen, " (unexpected character '%c')", *ptr); return -1; } if (curpx->tcp_req.inspect_delay) { snprintf(err, errlen, "ignoring %s %s (was already defined) in %s '%s'", args[0], args[1], proxy_type_str(curpx), curpx->id); return 1; } curpx->tcp_req.inspect_delay = val; return 0; } rule = (struct tcp_rule *)calloc(1, sizeof(*rule)); LIST_INIT(&rule->list); arg = 1; if (strcmp(args[1], "content") == 0) { arg++; if (tcp_parse_request_rule(args, arg, section_type, curpx, defpx, rule, err, errlen) < 0) goto error; if (rule->cond && (rule->cond->requires & ACL_USE_RTR_ANY)) { struct acl *acl; const char *name; acl = cond_find_require(rule->cond, ACL_USE_RTR_ANY); name = acl ? acl->name : "(unknown)"; retlen = snprintf(err, errlen, "acl '%s' involves some response-only criteria which will be ignored.", name); warn++; } LIST_ADDQ(&curpx->tcp_req.inspect_rules, &rule->list); } else if (strcmp(args[1], "connection") == 0) { arg++; if (!(curpx->cap & PR_CAP_FE)) { snprintf(err, errlen, "%s %s is not allowed because %s %s is not a frontend", args[0], args[1], proxy_type_str(curpx), curpx->id); return -1; } if (tcp_parse_request_rule(args, arg, section_type, curpx, defpx, rule, err, errlen) < 0) goto error; if (rule->cond && (rule->cond->requires & (ACL_USE_RTR_ANY|ACL_USE_L6_ANY|ACL_USE_L7_ANY))) { struct acl *acl; const char *name; acl = cond_find_require(rule->cond, ACL_USE_RTR_ANY|ACL_USE_L6_ANY|ACL_USE_L7_ANY); name = acl ? acl->name : "(unknown)"; if (acl->requires & (ACL_USE_L6_ANY|ACL_USE_L7_ANY)) { retlen = snprintf(err, errlen, "'%s %s' may not reference acl '%s' which makes use of " "payload in %s '%s'. Please use '%s content' for this.", args[0], args[1], name, proxy_type_str(curpx), curpx->id, args[0]); goto error; } if (acl->requires & ACL_USE_RTR_ANY) retlen = snprintf(err, errlen, "acl '%s' involves some response-only criteria which will be ignored.", name); warn++; } LIST_ADDQ(&curpx->tcp_req.l4_rules, &rule->list); } else { retlen = snprintf(err, errlen, "'%s' expects 'inspect-delay', 'connection', or 'content' in %s '%s' (was '%s')", args[0], proxy_type_str(curpx), curpx->id, args[1]); goto error; } return warn; error: free(rule); return -1; } /************************************************************************/ /* All supported ACL keywords must be declared here. */ /************************************************************************/ /* set test->ptr to point to the source IPv4/IPv6 address and test->i to the family */ static int acl_fetch_src(struct proxy *px, struct session *l4, void *l7, int dir, struct acl_expr *expr, struct acl_test *test) { test->i = l4->cli_addr.ss_family; if (test->i == AF_INET) test->ptr = (void *)&((struct sockaddr_in *)&l4->cli_addr)->sin_addr; else test->ptr = (void *)&((struct sockaddr_in6 *)(&l4->cli_addr))->sin6_addr; test->flags = ACL_TEST_F_READ_ONLY; return 1; } /* extract the connection's source address */ static int pattern_fetch_src(struct proxy *px, struct session *l4, void *l7, int dir, const char *arg, int arg_len, union pattern_data *data) { data->ip.s_addr = ((struct sockaddr_in *)&l4->cli_addr)->sin_addr.s_addr; return 1; } /* set test->i to the connection's source port */ static int acl_fetch_sport(struct proxy *px, struct session *l4, void *l7, int dir, struct acl_expr *expr, struct acl_test *test) { if (l4->cli_addr.ss_family == AF_INET) test->i = ntohs(((struct sockaddr_in *)&l4->cli_addr)->sin_port); else test->i = ntohs(((struct sockaddr_in6 *)(&l4->cli_addr))->sin6_port); test->flags = 0; return 1; } /* set test->ptr to point to the frontend's IPv4/IPv6 address and test->i to the family */ static int acl_fetch_dst(struct proxy *px, struct session *l4, void *l7, int dir, struct acl_expr *expr, struct acl_test *test) { if (!(l4->flags & SN_FRT_ADDR_SET)) get_frt_addr(l4); test->i = l4->frt_addr.ss_family; if (test->i == AF_INET) test->ptr = (void *)&((struct sockaddr_in *)&l4->frt_addr)->sin_addr; else test->ptr = (void *)&((struct sockaddr_in6 *)(&l4->frt_addr))->sin6_addr; test->flags = ACL_TEST_F_READ_ONLY; return 1; } /* extract the connection's destination address */ static int pattern_fetch_dst(struct proxy *px, struct session *l4, void *l7, int dir, const char *arg, int arg_len, union pattern_data *data) { data->ip.s_addr = ((struct sockaddr_in *)&l4->frt_addr)->sin_addr.s_addr; return 1; } /* set test->i to the frontend connexion's destination port */ static int acl_fetch_dport(struct proxy *px, struct session *l4, void *l7, int dir, struct acl_expr *expr, struct acl_test *test) { if (!(l4->flags & SN_FRT_ADDR_SET)) get_frt_addr(l4); if (l4->frt_addr.ss_family == AF_INET) test->i = ntohs(((struct sockaddr_in *)&l4->frt_addr)->sin_port); else test->i = ntohs(((struct sockaddr_in6 *)(&l4->frt_addr))->sin6_port); test->flags = 0; return 1; } static int pattern_fetch_dport(struct proxy *px, struct session *l4, void *l7, int dir, const char *arg, int arg_len, union pattern_data *data) { data->integer = ntohs(((struct sockaddr_in *)&l4->frt_addr)->sin_port); return 1; } static struct cfg_kw_list cfg_kws = {{ },{ { CFG_LISTEN, "tcp-request", tcp_parse_tcp_req }, { 0, NULL, NULL }, }}; /* Note: must not be declared as its list will be overwritten */ static struct acl_kw_list acl_kws = {{ },{ { "src_port", acl_parse_int, acl_fetch_sport, acl_match_int, ACL_USE_TCP_PERMANENT }, { "src", acl_parse_ip, acl_fetch_src, acl_match_ip, ACL_USE_TCP4_PERMANENT|ACL_MAY_LOOKUP }, { "dst", acl_parse_ip, acl_fetch_dst, acl_match_ip, ACL_USE_TCP4_PERMANENT|ACL_MAY_LOOKUP }, { "dst_port", acl_parse_int, acl_fetch_dport, acl_match_int, ACL_USE_TCP_PERMANENT }, { NULL, NULL, NULL, NULL }, }}; /* Note: must not be declared as its list will be overwritten */ static struct pattern_fetch_kw_list pattern_fetch_keywords = {{ },{ { "src", pattern_fetch_src, PATTERN_TYPE_IP, PATTERN_FETCH_REQ }, { "dst", pattern_fetch_dst, PATTERN_TYPE_IP, PATTERN_FETCH_REQ }, { "dst_port", pattern_fetch_dport, PATTERN_TYPE_INTEGER, PATTERN_FETCH_REQ }, { NULL, NULL, 0, 0 }, }}; __attribute__((constructor)) static void __tcp_protocol_init(void) { protocol_register(&proto_tcpv4); protocol_register(&proto_tcpv6); pattern_register_fetches(&pattern_fetch_keywords); cfg_register_keywords(&cfg_kws); acl_register_keywords(&acl_kws); } /* * Local variables: * c-indent-level: 8 * c-basic-offset: 8 * End: */