diff options
Diffstat (limited to 'lib/dpif.c')
| -rw-r--r-- | lib/dpif.c | 1060 |
1 files changed, 1060 insertions, 0 deletions
diff --git a/lib/dpif.c b/lib/dpif.c new file mode 100644 index 000000000..73ad5df00 --- /dev/null +++ b/lib/dpif.c @@ -0,0 +1,1060 @@ +/* + * Copyright (c) 2008, 2009 Nicira Networks. + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +#include <config.h> +#include "dpif.h" + +#include <assert.h> +#include <ctype.h> +#include <errno.h> +#include <fcntl.h> +#include <inttypes.h> +#include <net/if.h> +#include <linux/rtnetlink.h> +#include <linux/ethtool.h> +#include <linux/sockios.h> +#include <netinet/in.h> +#include <stdlib.h> +#include <string.h> +#include <sys/ioctl.h> +#include <sys/stat.h> +#include <sys/sysmacros.h> +#include <unistd.h> + +#include "coverage.h" +#include "dynamic-string.h" +#include "flow.h" +#include "netlink.h" +#include "odp-util.h" +#include "ofp-print.h" +#include "ofpbuf.h" +#include "packets.h" +#include "poll-loop.h" +#include "util.h" +#include "valgrind.h" + +#include "vlog.h" +#define THIS_MODULE VLM_dpif + +/* Rate limit for individual messages going to or from the datapath, output at + * DBG level. This is very high because, if these are enabled, it is because + * we really need to see them. */ +static struct vlog_rate_limit dpmsg_rl = VLOG_RATE_LIMIT_INIT(600, 600); + +/* Not really much point in logging many dpif errors. */ +static struct vlog_rate_limit error_rl = VLOG_RATE_LIMIT_INIT(9999, 5); + +static int get_minor_from_name(const char *name, unsigned int *minor); +static int name_to_minor(const char *name, unsigned int *minor); +static int lookup_minor(const char *name, unsigned int *minor); +static int open_by_minor(unsigned int minor, struct dpif *); +static int make_openvswitch_device(unsigned int minor, char **fnp); +static void check_rw_odp_flow(struct odp_flow *); + +int +dpif_open(const char *name, struct dpif *dpif) +{ + int listen_mask; + int error; + + dpif->fd = -1; + + error = name_to_minor(name, &dpif->minor); + if (error) { + return error; + } + + error = open_by_minor(dpif->minor, dpif); + if (error) { + return error; + } + + /* We can open the device, but that doesn't mean that it's been created. + * If it hasn't been, then any command other than ODP_DP_CREATE will + * return ENODEV. Try something innocuous. */ + listen_mask = 0; /* Make Valgrind happy. */ + if (ioctl(dpif->fd, ODP_GET_LISTEN_MASK, &listen_mask)) { + error = errno; + if (error != ENODEV) { + VLOG_WARN("dp%u: probe returned unexpected error: %s", + dpif->minor, strerror(error)); + } + dpif_close(dpif); + return error; + } + return 0; +} + +void +dpif_close(struct dpif *dpif) +{ + if (dpif) { + close(dpif->fd); + dpif->fd = -1; + } +} + +static int +do_ioctl(const struct dpif *dpif, int cmd, const char *cmd_name, + const void *arg) +{ + int error = ioctl(dpif->fd, cmd, arg) ? errno : 0; + if (cmd_name) { + if (error) { + VLOG_WARN_RL(&error_rl, "dp%u: ioctl(%s) failed (%s)", + dpif->minor, cmd_name, strerror(error)); + } else { + VLOG_DBG_RL(&dpmsg_rl, "dp%u: ioctl(%s): success", + dpif->minor, cmd_name); + } + } + return error; +} + +int +dpif_create(const char *name, struct dpif *dpif) +{ + unsigned int minor; + int error; + + if (!get_minor_from_name(name, &minor)) { + /* Minor was specified in 'name', go ahead and create it. */ + error = open_by_minor(minor, dpif); + if (error) { + return error; + } + + if (!strncmp(name, "nl:", 3)) { + char devname[128]; + sprintf(devname, "of%u", minor); + error = ioctl(dpif->fd, ODP_DP_CREATE, devname) < 0 ? errno : 0; + } else { + error = ioctl(dpif->fd, ODP_DP_CREATE, name) < 0 ? errno : 0; + } + if (error) { + dpif_close(dpif); + } + return error; + } else { + for (minor = 0; minor < ODP_MAX; minor++) { + error = open_by_minor(minor, dpif); + if (error) { + return error; + } + + error = ioctl(dpif->fd, ODP_DP_CREATE, name) < 0 ? errno : 0; + if (!error) { + return 0; + } + dpif_close(dpif); + if (error != EBUSY) { + return error; + } + } + return ENOBUFS; + } +} + +int +dpif_get_name(struct dpif *dpif, char *name, size_t name_size) +{ + struct odp_port port; + int error; + + assert(name_size > 0); + *name = '\0'; + + error = dpif_port_query_by_number(dpif, ODPP_LOCAL, &port); + if (!error) { + ovs_strlcpy(name, port.devname, name_size); + } + return error; +} + +int +dpif_delete(struct dpif *dpif) +{ + COVERAGE_INC(dpif_destroy); + return do_ioctl(dpif, ODP_DP_DESTROY, "ODP_DP_DESTROY", NULL); +} + +int +dpif_get_dp_stats(const struct dpif *dpif, struct odp_stats *stats) +{ + memset(stats, 0, sizeof *stats); + return do_ioctl(dpif, ODP_DP_STATS, "ODP_DP_STATS", stats); +} + +int +dpif_get_drop_frags(const struct dpif *dpif, bool *drop_frags) +{ + int tmp; + int error = do_ioctl(dpif, ODP_GET_DROP_FRAGS, "ODP_GET_DROP_FRAGS", &tmp); + *drop_frags = error ? tmp & 1 : false; + return error; +} + +int +dpif_set_drop_frags(struct dpif *dpif, bool drop_frags) +{ + int tmp = drop_frags; + return do_ioctl(dpif, ODP_SET_DROP_FRAGS, "ODP_SET_DROP_FRAGS", &tmp); +} + +int +dpif_get_listen_mask(const struct dpif *dpif, int *listen_mask) +{ + int error = do_ioctl(dpif, ODP_GET_LISTEN_MASK, "ODP_GET_LISTEN_MASK", + listen_mask); + if (error) { + *listen_mask = 0; + } + return error; +} + +int +dpif_set_listen_mask(struct dpif *dpif, int listen_mask) +{ + return do_ioctl(dpif, ODP_SET_LISTEN_MASK, "ODP_SET_LISTEN_MASK", + &listen_mask); +} + +int +dpif_purge(struct dpif *dpif) +{ + struct odp_stats stats; + unsigned int i; + int error; + + COVERAGE_INC(dpif_purge); + + error = dpif_get_dp_stats(dpif, &stats); + if (error) { + return error; + } + + for (i = 0; i < stats.max_miss_queue + stats.max_action_queue; i++) { + struct ofpbuf *buf; + error = dpif_recv(dpif, &buf); + if (error) { + return error == EAGAIN ? 0 : error; + } + ofpbuf_delete(buf); + } + return 0; +} + +int +dpif_port_add(struct dpif *dpif, const char *devname, uint16_t port_no, + uint16_t flags) +{ + struct odp_port port; + + COVERAGE_INC(dpif_port_add); + memset(&port, 0, sizeof port); + strncpy(port.devname, devname, sizeof port.devname); + port.port = port_no; + port.flags = flags; + if (!ioctl(dpif->fd, ODP_PORT_ADD, &port)) { + VLOG_DBG_RL(&dpmsg_rl, "dp%u: added %s as port %"PRIu16, + dpif->minor, devname, port_no); + return 0; + } else { + VLOG_WARN_RL(&error_rl, "dp%u: failed to add %s as port " + "%"PRIu16": %s", dpif->minor, devname, port_no, + strerror(errno)); + return errno; + } +} + +int +dpif_port_del(struct dpif *dpif, uint16_t port_no) +{ + int tmp = port_no; + COVERAGE_INC(dpif_port_del); + return do_ioctl(dpif, ODP_PORT_DEL, "ODP_PORT_DEL", &tmp); +} + +int +dpif_port_query_by_number(const struct dpif *dpif, uint16_t port_no, + struct odp_port *port) +{ + memset(port, 0, sizeof *port); + port->port = port_no; + if (!ioctl(dpif->fd, ODP_PORT_QUERY, port)) { + VLOG_DBG_RL(&dpmsg_rl, "dp%u: port %"PRIu16" is device %s", + dpif->minor, port_no, port->devname); + return 0; + } else { + VLOG_WARN_RL(&error_rl, "dp%u: failed to query port %"PRIu16": %s", + dpif->minor, port_no, strerror(errno)); + return errno; + } +} + +int +dpif_port_query_by_name(const struct dpif *dpif, const char *devname, + struct odp_port *port) +{ + memset(port, 0, sizeof *port); + strncpy(port->devname, devname, sizeof port->devname); + if (!ioctl(dpif->fd, ODP_PORT_QUERY, port)) { + VLOG_DBG_RL(&dpmsg_rl, "dp%u: device %s is on port %"PRIu16, + dpif->minor, devname, port->port); + return 0; + } else { + VLOG_WARN_RL(&error_rl, "dp%u: failed to query port %s: %s", + dpif->minor, devname, strerror(errno)); + return errno; + } +} + +int +dpif_port_list(const struct dpif *dpif, + struct odp_port **ports, size_t *n_ports) +{ + struct odp_portvec pv; + struct odp_stats stats; + int error; + + do { + error = dpif_get_dp_stats(dpif, &stats); + if (error) { + goto error; + } + + *ports = xcalloc(1, stats.n_ports * sizeof **ports); + pv.ports = *ports; + pv.n_ports = stats.n_ports; + error = do_ioctl(dpif, ODP_PORT_LIST, "ODP_PORT_LIST", &pv); + if (error) { + free(*ports); + goto error; + } + } while (pv.n_ports != stats.n_ports); + *n_ports = pv.n_ports; + return 0; + +error: + *ports = NULL; + *n_ports = 0; + return error; +} + +int +dpif_port_group_set(struct dpif *dpif, uint16_t group, + const uint16_t ports[], size_t n_ports) +{ + struct odp_port_group pg; + + COVERAGE_INC(dpif_port_group_set); + assert(n_ports <= UINT16_MAX); + pg.group = group; + pg.ports = (uint16_t *) ports; + pg.n_ports = n_ports; + return do_ioctl(dpif, ODP_PORT_GROUP_SET, "ODP_PORT_GROUP_SET", &pg); +} + +/* Careful: '*n_out' can be greater than 'n_ports' on return, if 'n_ports' is + * less than the number of ports in 'group'. */ +int +dpif_port_group_get(const struct dpif *dpif, uint16_t group, + uint16_t ports[], size_t n_ports, size_t *n_out) +{ + struct odp_port_group pg; + int error; + + assert(n_ports <= UINT16_MAX); + pg.group = group; + pg.ports = ports; + pg.n_ports = n_ports; + error = do_ioctl(dpif, ODP_PORT_GROUP_GET, "ODP_PORT_GROUP_GET", &pg); + *n_out = error ? 0 : pg.n_ports; + return error; +} + +int +dpif_flow_flush(struct dpif *dpif) +{ + COVERAGE_INC(dpif_flow_flush); + return do_ioctl(dpif, ODP_FLOW_FLUSH, "ODP_FLOW_FLUSH", NULL); +} + +static enum vlog_level +flow_message_log_level(int error) +{ + return error ? VLL_WARN : VLL_DBG; +} + +static bool +should_log_flow_message(int error) +{ + return !vlog_should_drop(THIS_MODULE, flow_message_log_level(error), + error ? &error_rl : &dpmsg_rl); +} + +static void +log_flow_message(const struct dpif *dpif, int error, + const char *operation, + const flow_t *flow, const struct odp_flow_stats *stats, + const union odp_action *actions, size_t n_actions) +{ + struct ds ds = DS_EMPTY_INITIALIZER; + ds_put_format(&ds, "dp%u: ", dpif->minor); + if (error) { + ds_put_cstr(&ds, "failed to "); + } + ds_put_format(&ds, "%s ", operation); + if (error) { + ds_put_format(&ds, "(%s) ", strerror(error)); + } + flow_format(&ds, flow); + if (stats) { + ds_put_cstr(&ds, ", "); + format_odp_flow_stats(&ds, stats); + } + if (actions || n_actions) { + ds_put_cstr(&ds, ", actions:"); + format_odp_actions(&ds, actions, n_actions); + } + vlog(THIS_MODULE, flow_message_log_level(error), "%s", ds_cstr(&ds)); + ds_destroy(&ds); +} + +static int +do_flow_ioctl(const struct dpif *dpif, int cmd, struct odp_flow *flow, + const char *operation, bool show_stats) +{ + int error = do_ioctl(dpif, cmd, NULL, flow); + if (error && show_stats) { + flow->n_actions = 0; + } + if (should_log_flow_message(error)) { + log_flow_message(dpif, error, operation, &flow->key, + show_stats && !error ? &flow->stats : NULL, + flow->actions, flow->n_actions); + } + return error; +} + +int +dpif_flow_put(struct dpif *dpif, struct odp_flow_put *put) +{ + int error = do_ioctl(dpif, ODP_FLOW_PUT, NULL, put); + COVERAGE_INC(dpif_flow_put); + if (should_log_flow_message(error)) { + struct ds operation = DS_EMPTY_INITIALIZER; + ds_put_cstr(&operation, "put"); + if (put->flags & ODPPF_CREATE) { + ds_put_cstr(&operation, "[create]"); + } + if (put->flags & ODPPF_MODIFY) { + ds_put_cstr(&operation, "[modify]"); + } + if (put->flags & ODPPF_ZERO_STATS) { + ds_put_cstr(&operation, "[zero]"); + } +#define ODPPF_ALL (ODPPF_CREATE | ODPPF_MODIFY | ODPPF_ZERO_STATS) + if (put->flags & ~ODPPF_ALL) { + ds_put_format(&operation, "[%x]", put->flags & ~ODPPF_ALL); + } + log_flow_message(dpif, error, ds_cstr(&operation), &put->flow.key, + !error ? &put->flow.stats : NULL, + put->flow.actions, put->flow.n_actions); + ds_destroy(&operation); + } + return error; +} + +int +dpif_flow_del(struct dpif *dpif, struct odp_flow *flow) +{ + COVERAGE_INC(dpif_flow_del); + check_rw_odp_flow(flow); + memset(&flow->stats, 0, sizeof flow->stats); + return do_flow_ioctl(dpif, ODP_FLOW_DEL, flow, "delete flow", true); +} + +int +dpif_flow_get(const struct dpif *dpif, struct odp_flow *flow) +{ + COVERAGE_INC(dpif_flow_query); + check_rw_odp_flow(flow); + memset(&flow->stats, 0, sizeof flow->stats); + return do_flow_ioctl(dpif, ODP_FLOW_GET, flow, "get flow", true); +} + +int +dpif_flow_get_multiple(const struct dpif *dpif, + struct odp_flow flows[], size_t n) +{ + struct odp_flowvec fv; + size_t i; + + COVERAGE_ADD(dpif_flow_query_multiple, n); + fv.flows = flows; + fv.n_flows = n; + for (i = 0; i < n; i++) { + check_rw_odp_flow(&flows[i]); + } + return do_ioctl(dpif, ODP_FLOW_GET_MULTIPLE, "ODP_FLOW_GET_MULTIPLE", + &fv); +} + +int +dpif_flow_list(const struct dpif *dpif, struct odp_flow flows[], size_t n, + size_t *n_out) +{ + struct odp_flowvec fv; + uint32_t i; + int error; + + COVERAGE_INC(dpif_flow_query_list); + fv.flows = flows; + fv.n_flows = n; + if (RUNNING_ON_VALGRIND) { + memset(flows, 0, n * sizeof *flows); + } else { + for (i = 0; i < n; i++) { + flows[i].actions = NULL; + flows[i].n_actions = 0; + } + } + error = do_ioctl(dpif, ODP_FLOW_LIST, NULL, &fv); + if (error) { + *n_out = 0; + VLOG_WARN_RL(&error_rl, "dp%u: flow list failed (%s)", + dpif->minor, strerror(error)); + } else { + COVERAGE_ADD(dpif_flow_query_list_n, fv.n_flows); + *n_out = fv.n_flows; + VLOG_DBG_RL(&dpmsg_rl, "dp%u: listed %zu flows", dpif->minor, *n_out); + } + return error; +} + +int +dpif_flow_list_all(const struct dpif *dpif, + struct odp_flow **flowsp, size_t *np) +{ + struct odp_stats stats; + struct odp_flow *flows; + size_t n_flows; + int error; + + *flowsp = NULL; + *np = 0; + + error = dpif_get_dp_stats(dpif, &stats); + if (error) { + return error; + } + + flows = xmalloc(sizeof *flows * stats.n_flows); + error = dpif_flow_list(dpif, flows, stats.n_flows, &n_flows); + if (error) { + free(flows); + return error; + } + + if (stats.n_flows != n_flows) { + VLOG_WARN_RL(&error_rl, "dp%u: datapath stats reported %"PRIu32" " + "flows but flow listing reported %zu", + dpif->minor, stats.n_flows, n_flows); + } + *flowsp = flows; + *np = n_flows; + return 0; +} + +int +dpif_execute(struct dpif *dpif, uint16_t in_port, + const union odp_action actions[], size_t n_actions, + const struct ofpbuf *buf) +{ + int error; + + COVERAGE_INC(dpif_execute); + if (n_actions > 0) { + struct odp_execute execute; + memset(&execute, 0, sizeof execute); + execute.in_port = in_port; + execute.actions = (union odp_action *) actions; + execute.n_actions = n_actions; + execute.data = buf->data; + execute.length = buf->size; + error = do_ioctl(dpif, ODP_EXECUTE, NULL, &execute); + } else { + error = 0; + } + + if (!(error ? VLOG_DROP_WARN(&error_rl) : VLOG_DROP_DBG(&dpmsg_rl))) { + struct ds ds = DS_EMPTY_INITIALIZER; + char *packet = ofp_packet_to_string(buf->data, buf->size, buf->size); + ds_put_format(&ds, "dp%u: execute ", dpif->minor); + format_odp_actions(&ds, actions, n_actions); + if (error) { + ds_put_format(&ds, " failed (%s)", strerror(error)); + } + ds_put_format(&ds, " on packet %s", packet); + vlog(THIS_MODULE, error ? VLL_WARN : VLL_DBG, "%s", ds_cstr(&ds)); + ds_destroy(&ds); + free(packet); + } + return error; +} + +int +dpif_recv(struct dpif *dpif, struct ofpbuf **bufp) +{ + struct ofpbuf *buf; + int retval; + int error; + + buf = ofpbuf_new(65536); + retval = read(dpif->fd, ofpbuf_tail(buf), ofpbuf_tailroom(buf)); + if (retval < 0) { + error = errno; + if (error != EAGAIN) { + VLOG_WARN_RL(&error_rl, "dp%u: read failed: %s", + dpif->minor, strerror(error)); + } + } else if (retval >= sizeof(struct odp_msg)) { + struct odp_msg *msg = buf->data; + if (msg->length <= retval) { + buf->size += retval; + if (VLOG_IS_DBG_ENABLED()) { + void *payload = msg + 1; + size_t length = buf->size - sizeof *msg; + char *s = ofp_packet_to_string(payload, length, length); + VLOG_DBG_RL(&dpmsg_rl, "dp%u: received %s message of length " + "%zu on port %"PRIu16": %s", dpif->minor, + (msg->type == _ODPL_MISS_NR ? "miss" + : msg->type == _ODPL_ACTION_NR ? "action" + : "<unknown>"), + msg->length - sizeof(struct odp_msg), + msg->port, s); + free(s); + } + *bufp = buf; + COVERAGE_INC(dpif_recv); + return 0; + } else { + VLOG_WARN_RL(&error_rl, "dp%u: discarding message truncated " + "from %zu bytes to %d", + dpif->minor, msg->length, retval); + error = ERANGE; + } + } else if (!retval) { + VLOG_WARN_RL(&error_rl, "dp%u: unexpected end of file", dpif->minor); + error = EPROTO; + } else { + VLOG_WARN_RL(&error_rl, + "dp%u: discarding too-short message (%d bytes)", + dpif->minor, retval); + error = ERANGE; + } + + *bufp = NULL; + ofpbuf_delete(buf); + return error; +} + +void +dpif_recv_wait(struct dpif *dpif) +{ + poll_fd_wait(dpif->fd, POLLIN); +} + +struct dpifmon { + struct dpif dpif; + struct nl_sock *sock; + int local_ifindex; +}; + +int +dpifmon_create(const char *datapath_name, struct dpifmon **monp) +{ + struct dpifmon *mon; + char local_name[IFNAMSIZ]; + int error; + + mon = *monp = xmalloc(sizeof *mon); + + error = dpif_open(datapath_name, &mon->dpif); + if (error) { + goto error; + } + error = dpif_get_name(&mon->dpif, local_name, sizeof local_name); + if (error) { + goto error_close_dpif; + } + + mon->local_ifindex = if_nametoindex(local_name); + if (!mon->local_ifindex) { + error = errno; + VLOG_WARN("could not get ifindex of %s device: %s", + local_name, strerror(errno)); + goto error_close_dpif; + } + + error = nl_sock_create(NETLINK_ROUTE, RTNLGRP_LINK, 0, 0, &mon->sock); + if (error) { + VLOG_WARN("could not create rtnetlink socket: %s", strerror(error)); + goto error_close_dpif; + } + + return 0; + +error_close_dpif: + dpif_close(&mon->dpif); +error: + free(mon); + *monp = NULL; + return error; +} + +void +dpifmon_destroy(struct dpifmon *mon) +{ + if (mon) { + dpif_close(&mon->dpif); + nl_sock_destroy(mon->sock); + } +} + +int +dpifmon_poll(struct dpifmon *mon, char **devnamep) +{ + static struct vlog_rate_limit slow_rl = VLOG_RATE_LIMIT_INIT(1, 5); + static const struct nl_policy rtnlgrp_link_policy[] = { + [IFLA_IFNAME] = { .type = NL_A_STRING }, + [IFLA_MASTER] = { .type = NL_A_U32, .optional = true }, + }; + struct nlattr *attrs[ARRAY_SIZE(rtnlgrp_link_policy)]; + struct ofpbuf *buf; + int error; + + *devnamep = NULL; +again: + error = nl_sock_recv(mon->sock, &buf, false); + switch (error) { + case 0: + if (!nl_policy_parse(buf, NLMSG_HDRLEN + sizeof(struct ifinfomsg), + rtnlgrp_link_policy, + attrs, ARRAY_SIZE(rtnlgrp_link_policy))) { + VLOG_WARN_RL(&slow_rl, "received bad rtnl message"); + error = ENOBUFS; + } else { + const char *devname = nl_attr_get_string(attrs[IFLA_IFNAME]); + bool for_us; + + if (attrs[IFLA_MASTER]) { + uint32_t master_ifindex = nl_attr_get_u32(attrs[IFLA_MASTER]); + for_us = master_ifindex == mon->local_ifindex; + } else { + /* It's for us if that device is one of our ports. This is + * open-coded instead of using dpif_port_query_by_name() to + * avoid logging a warning on failure. */ + struct odp_port port; + memset(&port, 0, sizeof port); + strncpy(port.devname, devname, sizeof port.devname); + for_us = !ioctl(mon->dpif.fd, ODP_PORT_QUERY, &port); + } + + if (!for_us) { + /* Not for us, try again. */ + ofpbuf_delete(buf); + COVERAGE_INC(dpifmon_poll_false_wakeup); + goto again; + } + COVERAGE_INC(dpifmon_poll_changed); + *devnamep = xstrdup(devname); + } + ofpbuf_delete(buf); + break; + + case EAGAIN: + /* Nothing to do. */ + break; + + case ENOBUFS: + VLOG_WARN_RL(&slow_rl, "dpifmon socket overflowed"); + break; + + default: + VLOG_WARN_RL(&slow_rl, "error on dpifmon socket: %s", strerror(error)); + break; + } + return error; +} + +void +dpifmon_run(struct dpifmon *mon UNUSED) +{ + /* Nothing to do in this implementation. */ +} + +void +dpifmon_wait(struct dpifmon *mon) +{ + nl_sock_wait(mon->sock, POLLIN); +} + +static int get_openvswitch_major(void); +static int get_major(const char *target, int default_major); + +static int +lookup_minor(const char *name, unsigned int *minor) +{ + struct ethtool_drvinfo drvinfo; + struct ifreq ifr; + int error; + int sock; + + *minor = -1; + sock = socket(AF_INET, SOCK_DGRAM, 0); + if (sock < 0) { + VLOG_WARN("socket(AF_INET) failed: %s", strerror(errno)); + error = errno; + goto error; + } + + memset(&ifr, 0, sizeof ifr); + strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name); + ifr.ifr_data = (caddr_t) &drvinfo; + + memset(&drvinfo, 0, sizeof drvinfo); + drvinfo.cmd = ETHTOOL_GDRVINFO; + if (ioctl(sock, SIOCETHTOOL, &ifr)) { + VLOG_WARN("ioctl(SIOCETHTOOL) failed: %s", strerror(errno)); + error = errno; + goto error_close_sock; + } + + if (strcmp(drvinfo.driver, "openvswitch")) { + VLOG_WARN("%s is not an openvswitch device", name); + error = EOPNOTSUPP; + goto error_close_sock; + } + + if (!isdigit(drvinfo.bus_info[0])) { + VLOG_WARN("%s ethtool info does not contain an openvswitch minor", + name); + error = EPROTOTYPE; + goto error_close_sock; + } + + *minor = atoi(drvinfo.bus_info); + close(sock); + return 0; + +error_close_sock: + close(sock); +error: + return error; +} + +static int +make_openvswitch_device(unsigned int minor, char **fnp) +{ + dev_t dev = makedev(get_openvswitch_major(), minor); + const char dirname[] = "/dev/net"; + struct stat s; + char fn[128]; + + *fnp = NULL; + sprintf(fn, "%s/dp%d", dirname, minor); + if (!stat(fn, &s)) { + if (!S_ISCHR(s.st_mode)) { + VLOG_WARN_RL(&error_rl, "%s is not a character device, fixing", + fn); + } else if (s.st_rdev != dev) { + VLOG_WARN_RL(&error_rl, + "%s is device %u:%u instead of %u:%u, fixing", + fn, major(s.st_rdev), minor(s.st_rdev), + major(dev), minor(dev)); + } else { + goto success; + } + if (unlink(fn)) { + VLOG_WARN_RL(&error_rl, "%s: unlink failed (%s)", + fn, strerror(errno)); + return errno; + } + } else if (errno == ENOENT) { + if (stat(dirname, &s)) { + if (errno == ENOENT) { + if (mkdir(dirname, 0755)) { + VLOG_WARN_RL(&error_rl, "%s: mkdir failed (%s)", + dirname, strerror(errno)); + return errno; + } + } else { + VLOG_WARN_RL(&error_rl, "%s: stat failed (%s)", + dirname, strerror(errno)); + return errno; + } + } + } else { + VLOG_WARN_RL(&error_rl, "%s: stat failed (%s)", fn, strerror(errno)); + return errno; + } + + /* The device needs to be created. */ + if (mknod(fn, S_IFCHR | 0700, dev)) { + VLOG_WARN_RL(&error_rl, + "%s: creating character device %u:%u failed (%s)", + fn, major(dev), minor(dev), strerror(errno)); + return errno; + } + +success: + *fnp = xstrdup(fn); + return 0; +} + + +static int +get_openvswitch_major(void) +{ + static unsigned int openvswitch_major; + if (!openvswitch_major) { + enum { DEFAULT_MAJOR = 248 }; + openvswitch_major = get_major("openvswitch", DEFAULT_MAJOR); + } + return openvswitch_major; +} + +static int +get_major(const char *target, int default_major) +{ + const char fn[] = "/proc/devices"; + char line[128]; + FILE *file; + int ln; + + file = fopen(fn, "r"); + if (!file) { + VLOG_ERR("opening %s failed (%s)", fn, strerror(errno)); + goto error; + } + + for (ln = 1; fgets(line, sizeof line, file); ln++) { + char name[64]; + int major; + + if (!strncmp(line, "Character", 9) || line[0] == '\0') { + /* Nothing to do. */ + } else if (!strncmp(line, "Block", 5)) { + /* We only want character devices, so skip the rest of the file. */ + break; + } else if (sscanf(line, "%d %63s", &major, name)) { + if (!strcmp(name, target)) { + fclose(file); + return major; + } + } else { + static bool warned; + if (!warned) { + VLOG_WARN("%s:%d: syntax error", fn, ln); + } + warned = true; + } + } + + VLOG_ERR("%s: %s major not found (is the module loaded?), using " + "default major %d", fn, target, default_major); +error: + VLOG_INFO("using default major %d for %s", default_major, target); + return default_major; +} + +static int +name_to_minor(const char *name, unsigned int *minor) +{ + if (!get_minor_from_name(name, minor)) { + return 0; + } + return lookup_minor(name, minor); +} + +static int +get_minor_from_name(const char *name, unsigned int *minor) +{ + if (!strncmp(name, "dp", 2) && isdigit(name[2])) { + *minor = atoi(name + 2); + return 0; + } else if (!strncmp(name, "nl:", 3) && isdigit(name[3])) { + /* This is for compatibility only and will be dropped. */ + *minor = atoi(name + 3); + return 0; + } else { + return EINVAL; + } +} + +static int +open_by_minor(unsigned int minor, struct dpif *dpif) +{ + int error; + char *fn; + int fd; + + dpif->minor = -1; + dpif->fd = -1; + error = make_openvswitch_device(minor, &fn); + if (error) { + return error; + } + + fd = open(fn, O_RDONLY | O_NONBLOCK); + if (fd < 0) { + error = errno; + VLOG_WARN("%s: open failed (%s)", fn, strerror(error)); + free(fn); + return error; + } + + free(fn); + dpif->minor = minor; + dpif->fd = fd; + return 0; +} + +/* There is a tendency to construct odp_flow objects on the stack and to + * forget to properly initialize their "actions" and "n_actions" members. + * When this happens, we get memory corruption because the kernel + * writes through the random pointer that is in the "actions" member. + * + * This function attempts to combat the problem by: + * + * - Forcing a segfault if "actions" points to an invalid region (instead + * of just getting back EFAULT, which can be easily missed in the log). + * + * - Storing a distinctive value that is likely to cause an + * easy-to-identify error later if it is dereferenced, etc. + * + * - Triggering a warning on uninitialized memory from Valgrind if + * "actions" or "n_actions" was not initialized. + */ +static void +check_rw_odp_flow(struct odp_flow *flow) +{ + if (flow->n_actions) { + memset(&flow->actions[0], 0xcc, sizeof flow->actions[0]); + } +} |