Adam <adam@eax.com> writes:
>
> and as show in above example and other repeated test, the port
> part is always set to 0. Shouldn't that be set to port number?
SOCK_RAW has no ports, so no.
>
> on similar token the "padding" part after the IP is always set
> to the same pattern. Shouldn't it rather be zeroed, or be
> some random data?
It should stay at the old value or alternatively be zeroed. That's a
kernel bug.
Here is a patch that implements the first alternative. David, please consider
applying.
diff -burp linux/include/linux/in.h linux-work/include/linux/in.h
--- linux/include/linux/in.h Thu Jul 5 13:18:27 2001
+++ linux-work/include/linux/in.h Sun Jul 8 19:05:30 2001
@@ -109,6 +109,10 @@ struct in_pktinfo
};
/* Structure describing an Internet (IP) socket address. */
+/* Note here and in others places is the assumption made that there
+ are no holes in in this structure. This is ok for all architectures
+ which layout structures members at worst to their natural
+ alignment. -AK */
#define __SOCK_SIZE__ 16 /* sizeof(struct sockaddr) */
struct sockaddr_in {
sa_family_t sin_family; /* Address family */
@@ -119,7 +123,7 @@ struct sockaddr_in {
unsigned char __pad[__SOCK_SIZE__ - sizeof(short int) -
sizeof(unsigned short int) - sizeof(struct in_addr)];
};
-#define sin_zero __pad /* for BSD UNIX comp. -FvK */
+#define sin_zero __pad
/*
diff -burp linux/net/ipv4/af_inet.c linux-work/net/ipv4/af_inet.c
--- linux/net/ipv4/af_inet.c Wed Jul 4 17:21:32 2001
+++ linux-work/net/ipv4/af_inet.c Sun Jul 8 19:05:31 2001
@@ -729,7 +729,7 @@ static int inet_getname(struct socket *s
sin->sin_port = sk->sport;
sin->sin_addr.s_addr = addr;
}
- *uaddr_len = sizeof(*sin);
+ *uaddr_len = sizeof(offsetof(struct sockaddr_in, sin_zero));
return(0);
}
diff -burp linux/net/ipv4/raw.c linux-work/net/ipv4/raw.c
--- linux/net/ipv4/raw.c Wed Jul 4 17:21:32 2001
+++ linux-work/net/ipv4/raw.c Sun Jul 8 19:06:10 2001
@@ -493,7 +493,7 @@ int raw_recvmsg(struct sock *sk, struct
goto out;
if (addr_len)
- *addr_len = sizeof(*sin);
+ *addr_len = offsetof(struct sockaddr_in, sin_zero);
if (flags & MSG_ERRQUEUE) {
err = ip_recv_error(sk, msg, len);
diff -burp linux/net/ipv4/udp.c linux-work/net/ipv4/udp.c
--- linux/net/ipv4/udp.c Thu Apr 12 21:11:39 2001
+++ linux-work/net/ipv4/udp.c Sun Jul 8 19:05:31 2001
@@ -635,7 +635,7 @@ int udp_recvmsg(struct sock *sk, struct
* Check any passed addresses
*/
if (addr_len)
- *addr_len=sizeof(*sin);
+ *addr_len=offsetof(struct sockaddr_in, sin_zero);
if (flags & MSG_ERRQUEUE)
return ip_recv_error(sk, msg, len);
-Andi
-
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This archive was generated by hypermail 2b29 : Sun Jul 15 2001 - 21:00:09 EST