* flow translation. */
#define MAX_RESUBMIT_RECURSION 64
+/* Maximum number of resubmit actions in a flow translation, whether they are
+ * recursive or not. */
+#define MAX_RESUBMITS (MAX_RESUBMIT_RECURSION * MAX_RESUBMIT_RECURSION)
+
struct ovs_rwlock xlate_rwlock = OVS_RWLOCK_INITIALIZER;
struct xbridge {
/* The rule that we are currently translating, or NULL. */
struct rule_dpif *rule;
- int recurse; /* Recursion level, via xlate_table_action. */
+ int mpls_depth_delta; /* Delta of the mpls stack depth since
+ * actions were last committed.
+ * Must be between -1 and 1 inclusive. */
+ ovs_be32 pre_push_mpls_lse; /* Used to record the top-most MPLS LSE
+ * prior to an mpls_push so that it may be
+ * used for a subsequent mpls_pop. */
+
+ /* Resubmit statistics, via xlate_table_action(). */
+ int recurse; /* Current resubmit nesting depth. */
+ int resubmits; /* Total number of resubmits. */
+
uint32_t orig_skb_priority; /* Priority when packet arrived. */
uint8_t table_id; /* OpenFlow table ID where flow was found. */
uint32_t sflow_n_outputs; /* Number of output ports. */
/* If 'struct flow' gets additional metadata, we'll need to zero it out
* before traversing a patch port. */
- BUILD_ASSERT_DECL(FLOW_WC_SEQ == 20);
+ BUILD_ASSERT_DECL(FLOW_WC_SEQ == 21);
if (!xport) {
xlate_report(ctx, "Nonexistent output port");
if (out_port != ODPP_NONE) {
commit_odp_actions(flow, &ctx->base_flow,
- &ctx->xout->odp_actions, &ctx->xout->wc);
+ &ctx->xout->odp_actions, &ctx->xout->wc,
+ &ctx->mpls_depth_delta);
nl_msg_put_odp_port(&ctx->xout->odp_actions, OVS_ACTION_ATTR_OUTPUT,
out_port);
rule_dpif_credit_stats(rule, ctx->xin->resubmit_stats);
}
+ ctx->resubmits++;
ctx->recurse++;
ctx->rule = rule;
actions = rule_dpif_get_actions(rule);
xlate_table_action(struct xlate_ctx *ctx,
ofp_port_t in_port, uint8_t table_id, bool may_packet_in)
{
- if (ctx->recurse < MAX_RESUBMIT_RECURSION) {
+ static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 1);
+
+ if (ctx->recurse >= MAX_RESUBMIT_RECURSION) {
+ VLOG_ERR_RL(&rl, "resubmit actions recursed over %d times",
+ MAX_RESUBMIT_RECURSION);
+ } else if (ctx->resubmits >= MAX_RESUBMITS) {
+ VLOG_ERR_RL(&rl, "over %d resubmit actions", MAX_RESUBMITS);
+ } else if (ctx->xout->odp_actions.size > UINT16_MAX) {
+ VLOG_ERR_RL(&rl, "resubmits yielded over 64 kB of actions");
+ } else if (ctx->stack.size >= 65536) {
+ VLOG_ERR_RL(&rl, "resubmits yielded over 64 kB of stack");
+ } else {
struct rule_dpif *rule;
ofp_port_t old_in_port = ctx->xin->flow.in_port.ofp_port;
uint8_t old_table_id = ctx->table_id;
}
ctx->table_id = old_table_id;
- } else {
- static struct vlog_rate_limit recurse_rl = VLOG_RATE_LIMIT_INIT(1, 1);
-
- VLOG_ERR_RL(&recurse_rl, "resubmit actions recursed over %d times",
- MAX_RESUBMIT_RECURSION);
+ return;
}
+
+ ctx->exit = true;
}
static void
memset(&key.tunnel, 0, sizeof key.tunnel);
commit_odp_actions(&ctx->xin->flow, &ctx->base_flow,
- &ctx->xout->odp_actions, &ctx->xout->wc);
+ &ctx->xout->odp_actions, &ctx->xout->wc,
+ &ctx->mpls_depth_delta);
odp_execute_actions(NULL, packet, &key, ctx->xout->odp_actions.data,
ctx->xout->odp_actions.size, NULL, NULL);
ofpbuf_delete(packet);
}
-static void
+static bool
compose_mpls_push_action(struct xlate_ctx *ctx, ovs_be16 eth_type)
{
struct flow_wildcards *wc = &ctx->xout->wc;
ovs_assert(eth_type_mpls(eth_type));
+ /* If mpls_depth_delta is negative then an MPLS POP action has been
+ * composed and the resulting MPLS label stack is unknown. This means
+ * an MPLS PUSH action can't be composed as it needs to know either the
+ * top-most MPLS LSE to use as a template for the new MPLS LSE, or that
+ * there is no MPLS label stack present. Thus, stop processing.
+ *
+ * If mpls_depth_delta is positive then an MPLS PUSH action has been
+ * composed and no further MPLS PUSH action may be performed without
+ * losing MPLS LSE and ether type information held in xtx->xin->flow.
+ * Thus, stop processing.
+ *
+ * If the MPLS LSE of the flow and base_flow differ then the MPLS LSE
+ * has been updated. Performing a MPLS PUSH action may be would result in
+ * losing MPLS LSE and ether type information held in xtx->xin->flow.
+ * Thus, stop processing.
+ *
+ * It is planned that in the future this case will be handled
+ * by recirculation */
+ if (ctx->mpls_depth_delta ||
+ ctx->xin->flow.mpls_lse != ctx->base_flow.mpls_lse) {
+ return true;
+ }
+
memset(&wc->masks.mpls_lse, 0xff, sizeof wc->masks.mpls_lse);
- memset(&wc->masks.mpls_depth, 0xff, sizeof wc->masks.mpls_depth);
- if (flow->mpls_depth) {
+ ctx->pre_push_mpls_lse = ctx->xin->flow.mpls_lse;
+
+ if (eth_type_mpls(ctx->xin->flow.dl_type)) {
flow->mpls_lse &= ~htonl(MPLS_BOS_MASK);
- flow->mpls_depth++;
} else {
ovs_be32 label;
uint8_t tc, ttl;
tc = (flow->nw_tos & IP_DSCP_MASK) >> 2;
ttl = flow->nw_ttl ? flow->nw_ttl : 0x40;
flow->mpls_lse = set_mpls_lse_values(ttl, tc, 1, label);
- flow->mpls_depth = 1;
}
flow->dl_type = eth_type;
+ ctx->mpls_depth_delta++;
+
+ return false;
}
-static void
+static bool
compose_mpls_pop_action(struct xlate_ctx *ctx, ovs_be16 eth_type)
{
struct flow_wildcards *wc = &ctx->xout->wc;
- struct flow *flow = &ctx->xin->flow;
- ovs_assert(eth_type_mpls(ctx->xin->flow.dl_type));
- ovs_assert(!eth_type_mpls(eth_type));
+ if (!eth_type_mpls(ctx->xin->flow.dl_type)) {
+ return true;
+ }
+
+ /* If mpls_depth_delta is negative then an MPLS POP action has been
+ * composed. Performing another MPLS POP action
+ * would result in losing ether type that results from
+ * the already composed MPLS POP. Thus, stop processing.
+ *
+ * It is planned that in the future this case will be handled
+ * by recirculation */
+ if (ctx->mpls_depth_delta < 0) {
+ return true;
+ }
memset(&wc->masks.mpls_lse, 0xff, sizeof wc->masks.mpls_lse);
- memset(&wc->masks.mpls_depth, 0xff, sizeof wc->masks.mpls_depth);
- if (flow->mpls_depth) {
- flow->mpls_depth--;
- flow->mpls_lse = htonl(0);
- if (!flow->mpls_depth) {
- flow->dl_type = eth_type;
- }
+ /* If mpls_depth_delta is positive then an MPLS PUSH action has been
+ * executed and the previous MPLS LSE saved in ctx->pre_push_mpls_lse. The
+ * flow's MPLS LSE should be restored to that value to allow any
+ * subsequent actions that update of the LSE to be executed correctly.
+ */
+ if (ctx->mpls_depth_delta > 0) {
+ ctx->xin->flow.mpls_lse = ctx->pre_push_mpls_lse;
}
+
+ ctx->xin->flow.dl_type = eth_type;
+ ctx->mpls_depth_delta--;
+
+ return false;
}
static bool
return true;
}
+ /* If mpls_depth_delta is negative then an MPLS POP action has been
+ * executed and the resulting MPLS label stack is unknown. This means
+ * a SET MPLS TTL push action can't be executed as it needs to manipulate
+ * the top-most MPLS LSE. Thus, stop processing.
+ *
+ * It is planned that in the future this case will be handled
+ * by recirculation.
+ */
+ if (ctx->mpls_depth_delta < 0) {
+ return true;
+ }
+
ctx->xout->wc.masks.mpls_lse |= htonl(MPLS_TTL_MASK);
set_mpls_lse_ttl(&ctx->xin->flow.mpls_lse, ttl);
return false;
xlate_learn_action(struct xlate_ctx *ctx,
const struct ofpact_learn *learn)
{
- struct ofputil_flow_mod *fm;
+ uint64_t ofpacts_stub[1024 / 8];
+ struct ofputil_flow_mod fm;
struct ofpbuf ofpacts;
ctx->xout->has_learn = true;
return;
}
- fm = xmalloc(sizeof *fm);
- ofpbuf_init(&ofpacts, 0);
- learn_execute(learn, &ctx->xin->flow, fm, &ofpacts);
-
- ofproto_dpif_flow_mod(ctx->xbridge->ofproto, fm);
+ ofpbuf_use_stub(&ofpacts, ofpacts_stub, sizeof ofpacts_stub);
+ learn_execute(learn, &ctx->xin->flow, &fm, &ofpacts);
+ ofproto_dpif_flow_mod(ctx->xbridge->ofproto, &fm);
+ ofpbuf_uninit(&ofpacts);
}
static void
uint32_t probability = (os->probability << 16) | os->probability;
commit_odp_actions(&ctx->xin->flow, &ctx->base_flow,
- &ctx->xout->odp_actions, &ctx->xout->wc);
+ &ctx->xout->odp_actions, &ctx->xout->wc,
+ &ctx->mpls_depth_delta);
compose_flow_sample_cookie(os->probability, os->collector_set_id,
os->obs_domain_id, os->obs_point_id, &cookie);
break;
case OFPACT_PUSH_MPLS:
- compose_mpls_push_action(ctx, ofpact_get_PUSH_MPLS(a)->ethertype);
+ if (compose_mpls_push_action(ctx,
+ ofpact_get_PUSH_MPLS(a)->ethertype)) {
+ return;
+ }
break;
case OFPACT_POP_MPLS:
- compose_mpls_pop_action(ctx, ofpact_get_POP_MPLS(a)->ethertype);
+ if (compose_mpls_pop_action(ctx,
+ ofpact_get_POP_MPLS(a)->ethertype)) {
+ return;
+ }
break;
case OFPACT_SET_MPLS_TTL:
ofpbuf_put(&dst->odp_actions, src->odp_actions.data,
src->odp_actions.size);
}
+
+/* Returns a reference to the sflow handled associated with ofproto, or NULL if
+ * there is none. The caller is responsible for decrementing the results ref
+ * count with dpif_sflow_unref(). */
+struct dpif_sflow *
+xlate_get_sflow(const struct ofproto_dpif *ofproto)
+{
+ struct dpif_sflow *sflow = NULL;
+ struct xbridge *xbridge;
+
+ ovs_rwlock_rdlock(&xlate_rwlock);
+ xbridge = xbridge_lookup(ofproto);
+ if (xbridge) {
+ sflow = dpif_sflow_ref(xbridge->sflow);
+ }
+ ovs_rwlock_unlock(&xlate_rwlock);
+
+ return sflow;
+}
+
+/* Returns a reference to the ipfix handled associated with ofproto, or NULL if
+ * there is none. The caller is responsible for decrementing the results ref
+ * count with dpif_ipfix_unref(). */
+struct dpif_ipfix *
+xlate_get_ipfix(const struct ofproto_dpif *ofproto)
+{
+ struct dpif_ipfix *ipfix = NULL;
+ struct xbridge *xbridge;
+
+ ovs_rwlock_rdlock(&xlate_rwlock);
+ xbridge = xbridge_lookup(ofproto);
+ if (xbridge) {
+ ipfix = dpif_ipfix_ref(xbridge->ipfix);
+ }
+ ovs_rwlock_unlock(&xlate_rwlock);
+
+ return ipfix;
+}
\f
static struct skb_priority_to_dscp *
get_skb_priority(const struct xport *xport, uint32_t skb_priority)
}
ctx.recurse = 0;
+ ctx.resubmits = 0;
ctx.orig_skb_priority = flow->skb_priority;
ctx.table_id = 0;
ctx.exit = false;
+ ctx.mpls_depth_delta = 0;
if (xin->ofpacts) {
ofpacts = xin->ofpacts;
}
}
+ if (nl_attr_oversized(ctx.xout->odp_actions.size)) {
+ /* These datapath actions are too big for a Netlink attribute, so we
+ * can't execute them. */
+ static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 1);
+
+ VLOG_ERR_RL(&rl, "discarding oversize datapath actions");
+ ofpbuf_clear(&ctx.xout->odp_actions);
+ }
+
ofpbuf_uninit(&ctx.stack);
/* Clear the metadata and register wildcard masks, because we won't
git://git.onelab.eu / sliver-openvswitch.git / blobdiff