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Date: Sat, 15 Aug 2009 21:10:18 -0700
From: Joe Perches <joe@...ches.com>
To: chuck.lever@...cle.com
Cc: jens@...one.net, brian.haley@...com,
David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: [RFC PATCH] lib/vsprintf.c: Add struct sockaddr * "%pN<foo>" output
Hi Chuck.
Here's a tentative patch that adds that facility you wanted in
this thread.
http://kerneltrap.org/mailarchive/linux-netdev/2008/11/25/4231684
This patch is on top of this patch:
http://marc.info/?l=linux-netdev&m=125034992003220&w=2
I'm not sure it's great or even useful, but just for discussion.
Use style:
* - 'N' For network socket (sockaddr) pointers
* if sa_family is IPv4, output is %pI4; if IPv6, output is %pI6c
* May be used with any combination of additional specifiers below
* 'p' decimal socket port number for IPv[46]: ":12345"
* 'f' decimal flowinfo for IPv6: "/123456789"
* 's' decimal scope_id number for IPv6: "%1234567890"
* so %pNp will print if IPv4 "1.2.3.4:1234", if IPv6: "1::c0a8:a:1234"
I think using ":" as the separator for the port number, while common,
and already frequently used in kernel source (see bullet 2 in):
http://www.ietf.org/id/draft-kawamura-ipv6-text-representation-03.txt
"Section 6: Notes on Combining IPv6 Addresses with Port Numbers".
is not good for readability.
Perhaps this style should be changed to the "[ipv6]:port" described
in the draft above.
cheers, Joe
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 9b79536..b3cbc38 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -791,6 +791,90 @@ static char *ip4_addr_string(char *buf, char *end, const u8 *addr,
return string(buf, end, ip4_addr, spec);
}
+static char *u32_dec_val(char *p, u32 val)
+{
+ char temp[9];
+ int digits;
+ u32 hi_val = val / 100000;
+ char *pos;
+ pos = put_dec_trunc(temp, val%100000);
+ if (hi_val)
+ pos = put_dec_trunc(pos, hi_val);
+ digits = pos - temp;
+ /* reverse the digits in temp */
+ while (digits--)
+ *p++ = temp[digits];
+ return p;
+}
+
+static char *socket_addr_string(char *buf, char *end,
+ const struct sockaddr *sa,
+ struct printf_spec spec, const char *fmt)
+{
+ char addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255") +
+ sizeof(":12345") +
+ sizeof("%1234567890") +
+ sizeof("/123456789")];
+ char *p;
+ struct sockaddr_in *sa4 = (struct sockaddr_in *)sa;
+ struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)sa;
+
+ switch (sa->sa_family) {
+ case AF_INET:
+ p = ip4_string(addr, (const u8 *)&sa4->sin_addr.s_addr, false);
+ break;
+ case AF_INET6:
+ p = ip6_compressed_string(addr, &sa6->sin6_addr);
+ break;
+ default: {
+ struct printf_spec num_spec = {
+ .base = 16,
+ .precision = -1,
+ .field_width = 2 * sizeof(void *),
+ .flags = SPECIAL | SMALL | ZEROPAD,
+ };
+
+ p = strcpy(addr, "Bad socket address: ")
+ + sizeof("Bad socket address: ");
+ p = number(p, addr + sizeof(addr), (unsigned long)sa, num_spec);
+ break;
+ }
+ }
+
+ while (isalpha(*++fmt)) {
+ switch (*fmt) {
+ case 'p':
+ *p++ = ':';
+ switch (sa->sa_family) {
+ case AF_INET:
+ p = u32_dec_val(p,ntohs(sa4->sin_port));
+ break;
+ case AF_INET6:
+ p = u32_dec_val(p,ntohs(sa6->sin6_port));
+ break;
+ }
+ break;
+ case 's':
+ *p++ = '%';
+ switch (sa->sa_family) {
+ case AF_INET6:
+ p = u32_dec_val(p, sa6->sin6_scope_id);
+ }
+ break;
+ case 'f':
+ *p++ = '/';
+ switch (sa->sa_family) {
+ case AF_INET6:
+ p = u32_dec_val(p, ntohl(sa6->sin6_flowinfo &
+ IPV6_FLOWINFO_MASK));
+ }
+ break;
+ }
+ }
+ *p = '\0';
+ return string(buf, end, addr, spec);
+}
+
/*
* Show a '%p' thing. A kernel extension is that the '%p' is followed
* by an extra set of alphanumeric characters that are extended format
@@ -814,6 +898,13 @@ static char *ip4_addr_string(char *buf, char *end, const u8 *addr,
* IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
* - 'I6c' for IPv6 addresses printed as specified by
* http://www.ietf.org/id/draft-kawamura-ipv6-text-representation-03.txt
+ * - 'N' For network socket (sockaddr) pointers
+ * if sa_family is IPv4, output is %pI4; if IPv6, output is %pI6c
+ * May be used with any combination of additional specifiers below
+ * 'p' decimal socket port number for IPv[46]: ":12345"
+ * 'f' decimal flowinfo for IPv6: "/123456789"
+ * 's' decimal scope_id number for IPv6: "%1234567890"
+ * so %pNp will print if IPv4 "1.2.3.4:1234", if IPv6: "1::c0a8:a:1234"
* Note: The difference between 'S' and 'F' is that on ia64 and ppc64
* function pointers are really function descriptors, which contain a
* pointer to the real address.
@@ -852,7 +943,10 @@ static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
return ip4_addr_string(buf, end, ptr, spec, fmt);
}
break;
+ case 'N':
+ return socket_addr_string(buf, end, ptr, spec, fmt);
}
+
spec.flags |= SMALL;
if (spec.field_width == -1) {
spec.field_width = 2*sizeof(void *);
--
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