---

yaml --- r: 183496 b: refs/heads/master c: d218d11 h: refs/heads/master v: v3
git-mirror · Jan 12, 2010 · 3652787 · 3652787
1 parent 26c0e65
commit 3652787
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Showing 5 changed files with 22 additions and 3 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: c8e000604bce02a87742240a9b716a0f1b680c0b
+refs/heads/master: d218d11133d888f9745802146a50255a4781d37a
diff --git a/trunk/include/linux/in.h b/trunk/include/linux/in.h
@@ -84,6 +84,8 @@ struct in_addr {
 #define IP_ORIGDSTADDR       20
 #define IP_RECVORIGDSTADDR   IP_ORIGDSTADDR
 
+#define IP_MINTTL       21
+
 /* IP_MTU_DISCOVER values */
 #define IP_PMTUDISC_DONT		0	/* Never send DF frames */
 #define IP_PMTUDISC_WANT		1	/* Use per route hints	*/

diff --git a/trunk/include/net/inet_sock.h b/trunk/include/net/inet_sock.h
@@ -122,10 +122,12 @@ struct inet_sock {
 	__be32			inet_saddr;
 	__s16			uc_ttl;
 	__u16			cmsg_flags;
-	struct ip_options	*opt;
 	__be16			inet_sport;
 	__u16			inet_id;
+
+	struct ip_options	*opt;
 	__u8			tos;
+	__u8			min_ttl;
 	__u8			mc_ttl;
 	__u8			pmtudisc;
 	__u8			recverr:1,

diff --git a/trunk/net/ipv4/ip_sockglue.c b/trunk/net/ipv4/ip_sockglue.c
@@ -451,7 +451,8 @@ static int do_ip_setsockopt(struct sock *sk, int level,
 			     (1<<IP_TTL) | (1<<IP_HDRINCL) |
 			     (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) |
 			     (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) |
-			     (1<<IP_PASSSEC) | (1<<IP_TRANSPARENT))) ||
+			     (1<<IP_PASSSEC) | (1<<IP_TRANSPARENT) |
+			     (1<<IP_MINTTL))) ||
 	    optname == IP_MULTICAST_TTL ||
 	    optname == IP_MULTICAST_ALL ||
 	    optname == IP_MULTICAST_LOOP ||
@@ -936,6 +937,14 @@ static int do_ip_setsockopt(struct sock *sk, int level,
 		inet->transparent = !!val;
 		break;
 
+	case IP_MINTTL:
+		if (optlen < 1)
+			goto e_inval;
+		if (val < 0 || val > 255)
+			goto e_inval;
+		inet->min_ttl = val;
+		break;
+
 	default:
 		err = -ENOPROTOOPT;
 		break;
@@ -1198,6 +1207,9 @@ static int do_ip_getsockopt(struct sock *sk, int level, int optname,
 	case IP_TRANSPARENT:
 		val = inet->transparent;
 		break;
+	case IP_MINTTL:
+		val = inet->min_ttl;
+		break;
 	default:
 		release_sock(sk);
 		return -ENOPROTOOPT;

diff --git a/trunk/net/ipv4/tcp_ipv4.c b/trunk/net/ipv4/tcp_ipv4.c
@@ -1649,6 +1649,9 @@ int tcp_v4_rcv(struct sk_buff *skb)
 	if (!sk)
 		goto no_tcp_socket;
 
+	if (iph->ttl < inet_sk(sk)->min_ttl)
+		goto discard_and_relse;
+
 process:
 	if (sk->sk_state == TCP_TIME_WAIT)
 		goto do_time_wait;