[Feature]add MT2731_MP2_MR2_SVN388 baseline version
Change-Id: Ief04314834b31e27effab435d3ca8ba33b499059
diff --git a/src/kernel/linux/v4.14/net/rxrpc/peer_event.c b/src/kernel/linux/v4.14/net/rxrpc/peer_event.c
new file mode 100644
index 0000000..7d73e8c
--- /dev/null
+++ b/src/kernel/linux/v4.14/net/rxrpc/peer_event.c
@@ -0,0 +1,353 @@
+/* Peer event handling, typically ICMP messages.
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * 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 <linux/module.h>
+#include <linux/net.h>
+#include <linux/skbuff.h>
+#include <linux/errqueue.h>
+#include <linux/udp.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <linux/icmp.h>
+#include <net/sock.h>
+#include <net/af_rxrpc.h>
+#include <net/ip.h>
+#include "ar-internal.h"
+
+static void rxrpc_store_error(struct rxrpc_peer *, struct sock_exterr_skb *);
+
+/*
+ * Find the peer associated with an ICMP packet.
+ */
+static struct rxrpc_peer *rxrpc_lookup_peer_icmp_rcu(struct rxrpc_local *local,
+ const struct sk_buff *skb)
+{
+ struct sock_exterr_skb *serr = SKB_EXT_ERR(skb);
+ struct sockaddr_rxrpc srx;
+
+ _enter("");
+
+ memset(&srx, 0, sizeof(srx));
+ srx.transport_type = local->srx.transport_type;
+ srx.transport_len = local->srx.transport_len;
+ srx.transport.family = local->srx.transport.family;
+
+ /* Can we see an ICMP4 packet on an ICMP6 listening socket? and vice
+ * versa?
+ */
+ switch (srx.transport.family) {
+ case AF_INET:
+ srx.transport.sin.sin_port = serr->port;
+ switch (serr->ee.ee_origin) {
+ case SO_EE_ORIGIN_ICMP:
+ _net("Rx ICMP");
+ memcpy(&srx.transport.sin.sin_addr,
+ skb_network_header(skb) + serr->addr_offset,
+ sizeof(struct in_addr));
+ break;
+ case SO_EE_ORIGIN_ICMP6:
+ _net("Rx ICMP6 on v4 sock");
+ memcpy(&srx.transport.sin.sin_addr,
+ skb_network_header(skb) + serr->addr_offset + 12,
+ sizeof(struct in_addr));
+ break;
+ default:
+ memcpy(&srx.transport.sin.sin_addr, &ip_hdr(skb)->saddr,
+ sizeof(struct in_addr));
+ break;
+ }
+ break;
+
+#ifdef CONFIG_AF_RXRPC_IPV6
+ case AF_INET6:
+ srx.transport.sin6.sin6_port = serr->port;
+ switch (serr->ee.ee_origin) {
+ case SO_EE_ORIGIN_ICMP6:
+ _net("Rx ICMP6");
+ memcpy(&srx.transport.sin6.sin6_addr,
+ skb_network_header(skb) + serr->addr_offset,
+ sizeof(struct in6_addr));
+ break;
+ case SO_EE_ORIGIN_ICMP:
+ _net("Rx ICMP on v6 sock");
+ srx.transport.sin6.sin6_addr.s6_addr32[0] = 0;
+ srx.transport.sin6.sin6_addr.s6_addr32[1] = 0;
+ srx.transport.sin6.sin6_addr.s6_addr32[2] = htonl(0xffff);
+ memcpy(srx.transport.sin6.sin6_addr.s6_addr + 12,
+ skb_network_header(skb) + serr->addr_offset,
+ sizeof(struct in_addr));
+ break;
+ default:
+ memcpy(&srx.transport.sin6.sin6_addr,
+ &ipv6_hdr(skb)->saddr,
+ sizeof(struct in6_addr));
+ break;
+ }
+ break;
+#endif
+
+ default:
+ BUG();
+ }
+
+ return rxrpc_lookup_peer_rcu(local, &srx);
+}
+
+/*
+ * Handle an MTU/fragmentation problem.
+ */
+static void rxrpc_adjust_mtu(struct rxrpc_peer *peer, struct sock_exterr_skb *serr)
+{
+ u32 mtu = serr->ee.ee_info;
+
+ _net("Rx ICMP Fragmentation Needed (%d)", mtu);
+
+ /* wind down the local interface MTU */
+ if (mtu > 0 && peer->if_mtu == 65535 && mtu < peer->if_mtu) {
+ peer->if_mtu = mtu;
+ _net("I/F MTU %u", mtu);
+ }
+
+ if (mtu == 0) {
+ /* they didn't give us a size, estimate one */
+ mtu = peer->if_mtu;
+ if (mtu > 1500) {
+ mtu >>= 1;
+ if (mtu < 1500)
+ mtu = 1500;
+ } else {
+ mtu -= 100;
+ if (mtu < peer->hdrsize)
+ mtu = peer->hdrsize + 4;
+ }
+ }
+
+ if (mtu < peer->mtu) {
+ spin_lock_bh(&peer->lock);
+ peer->mtu = mtu;
+ peer->maxdata = peer->mtu - peer->hdrsize;
+ spin_unlock_bh(&peer->lock);
+ _net("Net MTU %u (maxdata %u)",
+ peer->mtu, peer->maxdata);
+ }
+}
+
+/*
+ * Handle an error received on the local endpoint.
+ */
+void rxrpc_error_report(struct sock *sk)
+{
+ struct sock_exterr_skb *serr;
+ struct rxrpc_local *local = sk->sk_user_data;
+ struct rxrpc_peer *peer;
+ struct sk_buff *skb;
+
+ if (unlikely(!local))
+ return;
+
+ _enter("%p{%d}", sk, local->debug_id);
+
+ skb = sock_dequeue_err_skb(sk);
+ if (!skb) {
+ _leave("UDP socket errqueue empty");
+ return;
+ }
+ rxrpc_new_skb(skb, rxrpc_skb_rx_received);
+ serr = SKB_EXT_ERR(skb);
+ if (!skb->len && serr->ee.ee_origin == SO_EE_ORIGIN_TIMESTAMPING) {
+ _leave("UDP empty message");
+ rxrpc_free_skb(skb, rxrpc_skb_rx_freed);
+ return;
+ }
+
+ rcu_read_lock();
+ peer = rxrpc_lookup_peer_icmp_rcu(local, skb);
+ if (peer && !rxrpc_get_peer_maybe(peer))
+ peer = NULL;
+ if (!peer) {
+ rcu_read_unlock();
+ rxrpc_free_skb(skb, rxrpc_skb_rx_freed);
+ _leave(" [no peer]");
+ return;
+ }
+
+ if ((serr->ee.ee_origin == SO_EE_ORIGIN_ICMP &&
+ serr->ee.ee_type == ICMP_DEST_UNREACH &&
+ serr->ee.ee_code == ICMP_FRAG_NEEDED)) {
+ rxrpc_adjust_mtu(peer, serr);
+ rcu_read_unlock();
+ rxrpc_free_skb(skb, rxrpc_skb_rx_freed);
+ rxrpc_put_peer(peer);
+ _leave(" [MTU update]");
+ return;
+ }
+
+ rxrpc_store_error(peer, serr);
+ rcu_read_unlock();
+ rxrpc_free_skb(skb, rxrpc_skb_rx_freed);
+
+ /* The ref we obtained is passed off to the work item */
+ rxrpc_queue_work(&peer->error_distributor);
+ _leave("");
+}
+
+/*
+ * Map an error report to error codes on the peer record.
+ */
+static void rxrpc_store_error(struct rxrpc_peer *peer,
+ struct sock_exterr_skb *serr)
+{
+ struct sock_extended_err *ee;
+ int err;
+
+ _enter("");
+
+ ee = &serr->ee;
+
+ _net("Rx Error o=%d t=%d c=%d e=%d",
+ ee->ee_origin, ee->ee_type, ee->ee_code, ee->ee_errno);
+
+ err = ee->ee_errno;
+
+ switch (ee->ee_origin) {
+ case SO_EE_ORIGIN_ICMP:
+ switch (ee->ee_type) {
+ case ICMP_DEST_UNREACH:
+ switch (ee->ee_code) {
+ case ICMP_NET_UNREACH:
+ _net("Rx Received ICMP Network Unreachable");
+ break;
+ case ICMP_HOST_UNREACH:
+ _net("Rx Received ICMP Host Unreachable");
+ break;
+ case ICMP_PORT_UNREACH:
+ _net("Rx Received ICMP Port Unreachable");
+ break;
+ case ICMP_NET_UNKNOWN:
+ _net("Rx Received ICMP Unknown Network");
+ break;
+ case ICMP_HOST_UNKNOWN:
+ _net("Rx Received ICMP Unknown Host");
+ break;
+ default:
+ _net("Rx Received ICMP DestUnreach code=%u",
+ ee->ee_code);
+ break;
+ }
+ break;
+
+ case ICMP_TIME_EXCEEDED:
+ _net("Rx Received ICMP TTL Exceeded");
+ break;
+
+ default:
+ _proto("Rx Received ICMP error { type=%u code=%u }",
+ ee->ee_type, ee->ee_code);
+ break;
+ }
+ break;
+
+ case SO_EE_ORIGIN_NONE:
+ case SO_EE_ORIGIN_LOCAL:
+ _proto("Rx Received local error { error=%d }", err);
+ err += RXRPC_LOCAL_ERROR_OFFSET;
+ break;
+
+ case SO_EE_ORIGIN_ICMP6:
+ default:
+ _proto("Rx Received error report { orig=%u }", ee->ee_origin);
+ break;
+ }
+
+ peer->error_report = err;
+}
+
+/*
+ * Distribute an error that occurred on a peer
+ */
+void rxrpc_peer_error_distributor(struct work_struct *work)
+{
+ struct rxrpc_peer *peer =
+ container_of(work, struct rxrpc_peer, error_distributor);
+ struct rxrpc_call *call;
+ enum rxrpc_call_completion compl;
+ int error;
+
+ _enter("");
+
+ error = READ_ONCE(peer->error_report);
+ if (error < RXRPC_LOCAL_ERROR_OFFSET) {
+ compl = RXRPC_CALL_NETWORK_ERROR;
+ } else {
+ compl = RXRPC_CALL_LOCAL_ERROR;
+ error -= RXRPC_LOCAL_ERROR_OFFSET;
+ }
+
+ _debug("ISSUE ERROR %s %d", rxrpc_call_completions[compl], error);
+
+ spin_lock_bh(&peer->lock);
+
+ while (!hlist_empty(&peer->error_targets)) {
+ call = hlist_entry(peer->error_targets.first,
+ struct rxrpc_call, error_link);
+ hlist_del_init(&call->error_link);
+ rxrpc_see_call(call);
+
+ if (rxrpc_set_call_completion(call, compl, 0, -error))
+ rxrpc_notify_socket(call);
+ }
+
+ spin_unlock_bh(&peer->lock);
+
+ rxrpc_put_peer(peer);
+ _leave("");
+}
+
+/*
+ * Add RTT information to cache. This is called in softirq mode and has
+ * exclusive access to the peer RTT data.
+ */
+void rxrpc_peer_add_rtt(struct rxrpc_call *call, enum rxrpc_rtt_rx_trace why,
+ rxrpc_serial_t send_serial, rxrpc_serial_t resp_serial,
+ ktime_t send_time, ktime_t resp_time)
+{
+ struct rxrpc_peer *peer = call->peer;
+ s64 rtt;
+ u64 sum = peer->rtt_sum, avg;
+ u8 cursor = peer->rtt_cursor, usage = peer->rtt_usage;
+
+ rtt = ktime_to_ns(ktime_sub(resp_time, send_time));
+ if (rtt < 0)
+ return;
+
+ /* Replace the oldest datum in the RTT buffer */
+ sum -= peer->rtt_cache[cursor];
+ sum += rtt;
+ peer->rtt_cache[cursor] = rtt;
+ peer->rtt_cursor = (cursor + 1) & (RXRPC_RTT_CACHE_SIZE - 1);
+ peer->rtt_sum = sum;
+ if (usage < RXRPC_RTT_CACHE_SIZE) {
+ usage++;
+ peer->rtt_usage = usage;
+ }
+
+ /* Now recalculate the average */
+ if (usage == RXRPC_RTT_CACHE_SIZE) {
+ avg = sum / RXRPC_RTT_CACHE_SIZE;
+ } else {
+ avg = sum;
+ do_div(avg, usage);
+ }
+
+ peer->rtt = avg;
+ trace_rxrpc_rtt_rx(call, why, send_serial, resp_serial, rtt,
+ usage, avg);
+}