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hc
2024-01-05 071106ecf68c401173c58808b1cf5f68cc50d390 
 kernel/net/ipv4/ping.c
....@@ -1,14 +1,10 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /*
23  * INET		An implementation of the TCP/IP protocol suite for the LINUX
34  *		operating system.  INET is implemented using the  BSD Socket
45  *		interface as the means of communication with the user level.
56  *
67  *		"Ping" sockets
7
- *
8
- *		This program is free software; you can redistribute it and/or
9
- *		modify it under the terms of the GNU General Public License
10
- *		as published by the Free Software Foundation; either version
11
- *		2 of the License, or (at your option) any later version.
128  *
139  * Based on ipv4/udp.c code.
1410  *
....@@ -17,7 +13,6 @@
1713  *
1814  * Pavel gave all rights to bugs to Vasiliy,
1915  * none of the bugs are Pavel's now.
20
- *
2116  */
2217 
2318 #include <linux/uaccess.h>
....@@ -305,10 +300,12 @@
305300 
306301 /* Checks the bind address and possibly modifies sk->sk_bound_dev_if. */
307302 static int ping_check_bind_addr(struct sock *sk, struct inet_sock *isk,
308
-				struct sockaddr *uaddr, int addr_len) {
303
+				struct sockaddr *uaddr, int addr_len)
304
+{
309305 	struct net *net = sock_net(sk);
310306 	if (sk->sk_family == AF_INET) {
311307 		struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
308
+		u32 tb_id = RT_TABLE_LOCAL;
312309 		int chk_addr_ret;
313310 
314311 		if (addr_len < sizeof(*addr))
....@@ -322,10 +319,12 @@
322319 		pr_debug("ping_check_bind_addr(sk=%p,addr=%pI4,port=%d)\n",
323320 			 sk, &addr->sin_addr.s_addr, ntohs(addr->sin_port));
324321 
325
-		chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr);
326
-
327322 		if (addr->sin_addr.s_addr == htonl(INADDR_ANY))
328323 			chk_addr_ret = RTN_LOCAL;
324
+		else {
325
+			tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id;
326
+			chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id);
327
+		}
329328 
330329 		if ((!inet_can_nonlocal_bind(net, isk) &&
331330 		     chk_addr_ret != RTN_LOCAL) ||
....@@ -363,6 +362,14 @@
363362 				return -ENODEV;
364363 			}
365364 		}
365
+
366
+		if (!dev && sk->sk_bound_dev_if) {
367
+			dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
368
+			if (!dev) {
369
+				rcu_read_unlock();
370
+				return -ENODEV;
371
+			}
372
+		}
366373 		has_addr = pingv6_ops.ipv6_chk_addr(net, &addr->sin6_addr, dev,
367374 						    scoped);
368375 		rcu_read_unlock();
....@@ -395,20 +402,6 @@
395402 	}
396403 }
397404 
398
-static void ping_clear_saddr(struct sock *sk, int dif)
399
-{
400
-	sk->sk_bound_dev_if = dif;
401
-	if (sk->sk_family == AF_INET) {
402
-		struct inet_sock *isk = inet_sk(sk);
403
-		isk->inet_rcv_saddr = isk->inet_saddr = 0;
404
-#if IS_ENABLED(CONFIG_IPV6)
405
-	} else if (sk->sk_family == AF_INET6) {
406
-		struct ipv6_pinfo *np = inet6_sk(sk);
407
-		memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr));
408
-		memset(&np->saddr, 0, sizeof(np->saddr));
409
-#endif
410
-	}
411
-}
412405 /*
413406  * We need our own bind because there are no privileged id's == local ports.
414407  * Moreover, we don't allow binding to multi- and broadcast addresses.
....@@ -432,12 +425,13 @@
432425 		goto out;
433426 
434427 	err = -EADDRINUSE;
435
-	ping_set_saddr(sk, uaddr);
436428 	snum = ntohs(((struct sockaddr_in *)uaddr)->sin_port);
437429 	if (ping_get_port(sk, snum) != 0) {
438
-		ping_clear_saddr(sk, dif);
430
+		/* Restore possibly modified sk->sk_bound_dev_if by ping_check_bind_addr(). */
431
+		sk->sk_bound_dev_if = dif;
439432 		goto out;
440433 	}
434
+	ping_set_saddr(sk, uaddr);
441435 
442436 	pr_debug("after bind(): num = %hu, dif = %d\n",
443437 		 isk->inet_num,
....@@ -659,7 +653,8 @@
659653 }
660654 
661655 int ping_common_sendmsg(int family, struct msghdr *msg, size_t len,
662
-			void *user_icmph, size_t icmph_len) {
656
+			void *user_icmph, size_t icmph_len)
657
+{
663658 	u8 type, code;
664659 
665660 	if (len > 0xFFFF)
....@@ -786,14 +781,14 @@
786781 	}
787782 
788783 	if (ipv4_is_multicast(daddr)) {
789
-		if (!ipc.oif)
784
+		if (!ipc.oif || netif_index_is_l3_master(sock_net(sk), ipc.oif))
790785 			ipc.oif = inet->mc_index;
791786 		if (!saddr)
792787 			saddr = inet->mc_addr;
793788 	} else if (!ipc.oif)
794789 		ipc.oif = inet->uc_index;
795790 
796
-	flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos,
791
+	flowi4_init_output(&fl4, ipc.oif, ipc.sockc.mark, tos,
797792 			   RT_SCOPE_UNIVERSE, sk->sk_protocol,
798793 			   inet_sk_flowi_flags(sk), faddr, saddr, 0, 0,
799794 			   sk->sk_uid);
....@@ -801,7 +796,7 @@
801796 	fl4.fl4_icmp_type = user_icmph.type;
802797 	fl4.fl4_icmp_code = user_icmph.code;
803798 
804
-	security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
799
+	security_sk_classify_flow(sk, flowi4_to_flowi_common(&fl4));
805800 	rt = ip_route_output_flow(net, &fl4, sk);
806801 	if (IS_ERR(rt)) {
807802 		err = PTR_ERR(rt);
....@@ -1125,7 +1120,7 @@
11251120 	__u16 srcp = ntohs(inet->inet_sport);
11261121 
11271122 	seq_printf(f, "%5d: %08X:%04X %08X:%04X"
1128
-		" %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d",
1123
+		" %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %u",
11291124 		bucket, src, srcp, dest, destp, sp->sk_state,
11301125 		sk_wmem_alloc_get(sp),
11311126 		sk_rmem_alloc_get(sp),