X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=lib%2Fsocket-util.c;h=a37dfe4aa5cbf01572d87d69b0b3e6be2d6b7771;hb=7c690f462fec1af60d76c67fac226fc648ea9149;hp=a9b3b1adcaec1a1cc83a7ad09acb8ade31898a90;hpb=cea157688977bbbb136f9c3bfe020fe485b43d39;p=sliver-openvswitch.git diff --git a/lib/socket-util.c b/lib/socket-util.c index a9b3b1adc..a37dfe4aa 100644 --- a/lib/socket-util.c +++ b/lib/socket-util.c @@ -1,5 +1,5 @@ /* - * Copyright (c) 2008, 2009, 2010, 2011, 2012 Nicira Networks. + * Copyright (c) 2008, 2009, 2010, 2011, 2012 Nicira, Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. @@ -30,14 +30,16 @@ #include #include #include +#include #include #include #include "dynamic-string.h" #include "fatal-signal.h" #include "packets.h" +#include "poll-loop.h" #include "util.h" #include "vlog.h" -#if AF_PACKET && __linux__ +#if AF_PACKET && LINUX_DATAPATH #include #endif #ifdef HAVE_NETLINK @@ -49,11 +51,9 @@ VLOG_DEFINE_THIS_MODULE(socket_util); /* #ifdefs make it a pain to maintain code: you have to try to build both ways. * Thus, this file compiles all of the code regardless of the target, by - * writing "if (LINUX)" instead of "#ifdef __linux__". */ -#ifdef __linux__ -#define LINUX 1 -#else -#define LINUX 0 + * writing "if (LINUX_DATAPATH)" instead of "#ifdef __linux__". */ +#ifndef LINUX_DATAPATH +#define LINUX_DATAPATH 0 #endif #ifndef O_DIRECTORY @@ -82,15 +82,25 @@ set_nonblocking(int fd) } } -static int +void +xset_nonblocking(int fd) +{ + if (set_nonblocking(fd)) { + exit(EXIT_FAILURE); + } +} + +int set_dscp(int fd, uint8_t dscp) { + int val; + if (dscp > 63) { return EINVAL; } - dscp = dscp << 2; - if (setsockopt(fd, IPPROTO_IP, IP_TOS, &dscp, sizeof dscp)) { + val = dscp << 2; + if (setsockopt(fd, IPPROTO_IP, IP_TOS, &val, sizeof val)) { return errno; } @@ -171,7 +181,7 @@ lookup_ipv6(const char *host_name, struct in6_addr *addr) * Most Open vSwitch code should not use this because it causes deadlocks: * gethostbyname() sends out a DNS request but that starts a new flow for which * OVS must set up a flow, but it can't because it's waiting for a DNS reply. - * The synchronous lookup also delays other activty. (Of course we can solve + * The synchronous lookup also delays other activity. (Of course we can solve * this but it doesn't seem worthwhile quite yet.) */ int lookup_hostname(const char *host_name, struct in_addr *addr) @@ -254,7 +264,7 @@ drain_rcvbuf(int fd) * * On other Unix-like OSes, MSG_TRUNC has no effect in the flags * argument. */ - char buffer[LINUX ? 1 : 2048]; + char buffer[LINUX_DATAPATH ? 1 : 2048]; ssize_t n_bytes = recv(fd, buffer, sizeof buffer, MSG_TRUNC | MSG_DONTWAIT); if (n_bytes <= 0 || n_bytes >= rcvbuf) { @@ -323,7 +333,7 @@ make_sockaddr_un(const char *name, struct sockaddr_un *un, socklen_t *un_len, if (strlen(name) > MAX_UN_LEN) { static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 1); - if (LINUX) { + if (LINUX_DATAPATH) { /* 'name' is too long to fit in a sockaddr_un, but we have a * workaround for that on Linux: shorten it by opening a file * descriptor for the directory part of the name and indirecting @@ -384,12 +394,11 @@ bind_unix_socket(int fd, struct sockaddr *sun, socklen_t sun_len) /* Creates a Unix domain socket in the given 'style' (either SOCK_DGRAM or * SOCK_STREAM) that is bound to '*bind_path' (if 'bind_path' is non-null) and * connected to '*connect_path' (if 'connect_path' is non-null). If 'nonblock' - * is true, the socket is made non-blocking. If 'passcred' is true, the socket - * is configured to receive SCM_CREDENTIALS control messages. + * is true, the socket is made non-blocking. * * Returns the socket's fd if successful, otherwise a negative errno value. */ int -make_unix_socket(int style, bool nonblock, bool passcred OVS_UNUSED, +make_unix_socket(int style, bool nonblock, const char *bind_path, const char *connect_path) { int error; @@ -457,16 +466,6 @@ make_unix_socket(int style, bool nonblock, bool passcred OVS_UNUSED, } } -#ifdef SCM_CREDENTIALS - if (passcred) { - int enable = 1; - if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &enable, sizeof(enable))) { - error = errno; - goto error; - } - } -#endif - return fd; error: @@ -892,6 +891,22 @@ xpipe(int fds[2]) } } +void +xpipe_nonblocking(int fds[2]) +{ + xpipe(fds); + xset_nonblocking(fds[0]); + xset_nonblocking(fds[1]); +} + +void +xsocketpair(int domain, int type, int protocol, int fds[2]) +{ + if (socketpair(domain, type, protocol, fds)) { + VLOG_FATAL("failed to create socketpair (%s)", strerror(errno)); + } +} + static int getsockopt_int(int fd, int level, int option, const char *optname, int *valuep) { @@ -971,7 +986,7 @@ describe_sockaddr(struct ds *string, int fd, } } #endif -#if AF_PACKET && __linux__ +#if AF_PACKET && LINUX_DATAPATH else if (ss.ss_family == AF_PACKET) { struct sockaddr_ll sll; @@ -1001,7 +1016,7 @@ describe_sockaddr(struct ds *string, int fd, } -#ifdef __linux__ +#ifdef LINUX_DATAPATH static void put_fd_filename(struct ds *string, int fd) { @@ -1045,9 +1060,255 @@ describe_fd(int fd) : S_ISFIFO(s.st_mode) ? "FIFO" : S_ISLNK(s.st_mode) ? "symbolic link" : "unknown")); -#ifdef __linux__ +#ifdef LINUX_DATAPATH put_fd_filename(&string, fd); #endif } return ds_steal_cstr(&string); } + +/* Returns the total of the 'iov_len' members of the 'n_iovs' in 'iovs'. + * The caller must ensure that the total does not exceed SIZE_MAX. */ +size_t +iovec_len(const struct iovec iovs[], size_t n_iovs) +{ + size_t len = 0; + size_t i; + + for (i = 0; i < n_iovs; i++) { + len += iovs[i].iov_len; + } + return len; +} + +/* Returns true if all of the 'n_iovs' iovecs in 'iovs' have length zero. */ +bool +iovec_is_empty(const struct iovec iovs[], size_t n_iovs) +{ + size_t i; + + for (i = 0; i < n_iovs; i++) { + if (iovs[i].iov_len) { + return false; + } + } + return true; +} + +/* Sends the 'n_iovs' iovecs of data in 'iovs' and the 'n_fds' file descriptors + * in 'fds' on Unix domain socket 'sock'. Returns the number of bytes + * successfully sent or -1 if an error occurred. On error, sets errno + * appropriately. */ +int +send_iovec_and_fds(int sock, + const struct iovec *iovs, size_t n_iovs, + const int fds[], size_t n_fds) +{ + assert(sock >= 0); + if (n_fds > 0) { + union { + struct cmsghdr cm; + char control[CMSG_SPACE(SOUTIL_MAX_FDS * sizeof *fds)]; + } cmsg; + struct msghdr msg; + + assert(!iovec_is_empty(iovs, n_iovs)); + assert(n_fds <= SOUTIL_MAX_FDS); + + memset(&cmsg, 0, sizeof cmsg); + cmsg.cm.cmsg_len = CMSG_LEN(n_fds * sizeof *fds); + cmsg.cm.cmsg_level = SOL_SOCKET; + cmsg.cm.cmsg_type = SCM_RIGHTS; + memcpy(CMSG_DATA(&cmsg.cm), fds, n_fds * sizeof *fds); + + msg.msg_name = NULL; + msg.msg_namelen = 0; + msg.msg_iov = (struct iovec *) iovs; + msg.msg_iovlen = n_iovs; + msg.msg_control = &cmsg.cm; + msg.msg_controllen = CMSG_SPACE(n_fds * sizeof *fds); + msg.msg_flags = 0; + + return sendmsg(sock, &msg, 0); + } else { + return writev(sock, iovs, n_iovs); + } +} + +/* Sends the 'n_iovs' iovecs of data in 'iovs' and the 'n_fds' file descriptors + * in 'fds' on Unix domain socket 'sock'. If 'skip_bytes' is nonzero, then the + * first 'skip_bytes' of data in the iovecs are not sent, and none of the file + * descriptors are sent. The function continues to retry sending until an + * error (other than EINTR) occurs or all the data and fds are sent. + * + * Returns 0 if all the data and fds were successfully sent, otherwise a + * positive errno value. Regardless of success, stores the number of bytes + * sent (always at least 'skip_bytes') in '*bytes_sent'. (If at least one byte + * is sent, then all the fds have been sent.) + * + * 'skip_bytes' must be less than or equal to iovec_len(iovs, n_iovs). */ +int +send_iovec_and_fds_fully(int sock, + const struct iovec iovs[], size_t n_iovs, + const int fds[], size_t n_fds, + size_t skip_bytes, size_t *bytes_sent) +{ + *bytes_sent = 0; + while (n_iovs > 0) { + int retval; + + if (skip_bytes) { + retval = skip_bytes; + skip_bytes = 0; + } else if (!*bytes_sent) { + retval = send_iovec_and_fds(sock, iovs, n_iovs, fds, n_fds); + } else { + retval = writev(sock, iovs, n_iovs); + } + + if (retval > 0) { + *bytes_sent += retval; + while (retval > 0) { + const uint8_t *base = iovs->iov_base; + size_t len = iovs->iov_len; + + if (retval < len) { + size_t sent; + int error; + + error = write_fully(sock, base + retval, len - retval, + &sent); + *bytes_sent += sent; + retval += sent; + if (error) { + return error; + } + } + retval -= len; + iovs++; + n_iovs--; + } + } else if (retval == 0) { + if (iovec_is_empty(iovs, n_iovs)) { + break; + } + VLOG_WARN("send returned 0"); + return EPROTO; + } else if (errno != EINTR) { + return errno; + } + } + + return 0; +} + +/* Sends the 'n_iovs' iovecs of data in 'iovs' and the 'n_fds' file descriptors + * in 'fds' on Unix domain socket 'sock'. The function continues to retry + * sending until an error (other than EAGAIN or EINTR) occurs or all the data + * and fds are sent. Upon EAGAIN, the function blocks until the socket is + * ready for more data. + * + * Returns 0 if all the data and fds were successfully sent, otherwise a + * positive errno value. */ +int +send_iovec_and_fds_fully_block(int sock, + const struct iovec iovs[], size_t n_iovs, + const int fds[], size_t n_fds) +{ + size_t sent = 0; + + for (;;) { + int error; + + error = send_iovec_and_fds_fully(sock, iovs, n_iovs, + fds, n_fds, sent, &sent); + if (error != EAGAIN) { + return error; + } + poll_fd_wait(sock, POLLOUT); + poll_block(); + } +} + +/* Attempts to receive from Unix domain socket 'sock' up to 'size' bytes of + * data into 'data' and up to SOUTIL_MAX_FDS file descriptors into 'fds'. + * + * - Upon success, returns the number of bytes of data copied into 'data' + * and stores the number of received file descriptors into '*n_fdsp'. + * + * - On failure, returns a negative errno value and stores 0 in + * '*n_fdsp'. + * + * - On EOF, returns 0 and stores 0 in '*n_fdsp'. */ +int +recv_data_and_fds(int sock, + void *data, size_t size, + int fds[SOUTIL_MAX_FDS], size_t *n_fdsp) +{ + union { + struct cmsghdr cm; + char control[CMSG_SPACE(SOUTIL_MAX_FDS * sizeof *fds)]; + } cmsg; + struct msghdr msg; + int retval; + struct cmsghdr *p; + size_t i; + + *n_fdsp = 0; + + do { + struct iovec iov; + + iov.iov_base = data; + iov.iov_len = size; + + msg.msg_name = NULL; + msg.msg_namelen = 0; + msg.msg_iov = &iov; + msg.msg_iovlen = 1; + msg.msg_control = &cmsg.cm; + msg.msg_controllen = sizeof cmsg.control; + msg.msg_flags = 0; + + retval = recvmsg(sock, &msg, 0); + } while (retval < 0 && errno == EINTR); + if (retval <= 0) { + return retval < 0 ? -errno : 0; + } + + for (p = CMSG_FIRSTHDR(&msg); p; p = CMSG_NXTHDR(&msg, p)) { + if (p->cmsg_level != SOL_SOCKET || p->cmsg_type != SCM_RIGHTS) { + VLOG_ERR("unexpected control message %d:%d", + p->cmsg_level, p->cmsg_type); + goto error; + } else if (*n_fdsp) { + VLOG_ERR("multiple SCM_RIGHTS received"); + goto error; + } else { + size_t n_fds = (p->cmsg_len - CMSG_LEN(0)) / sizeof *fds; + const int *fds_data = (const int *) CMSG_DATA(p); + + assert(n_fds > 0); + if (n_fds > SOUTIL_MAX_FDS) { + VLOG_ERR("%zu fds received but only %d supported", + n_fds, SOUTIL_MAX_FDS); + for (i = 0; i < n_fds; i++) { + close(fds_data[i]); + } + goto error; + } + + *n_fdsp = n_fds; + memcpy(fds, fds_data, n_fds * sizeof *fds); + } + } + + return retval; + +error: + for (i = 0; i < *n_fdsp; i++) { + close(fds[i]); + } + *n_fdsp = 0; + return EPROTO; +}