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SubjectRe: [PATCH v4] tools lib traceevent: Add support for IP address formats
any other comments on this one?

On 12/18/14 7:11 PM, David Ahern wrote:
> Add helpers for the following kernel formats:
> %pi4 print an IPv4 address with leading zeros
> %pI4 print an IPv4 address without leading zeros
> %pi6 print an IPv6 address without colons
> %pI6 print an IPv6 address with colons
> %pI6c print an IPv6 address in compressed form with colons
> %pISpc print an IP address from a sockaddr
>
> Allows these formats to be used in tracepoints.
>
> Quite a bit of this is adapted from code in lib/vsprintf.c.
>
> v4:
> - fixed pI6c description in git commit message per Valdis' comment
>
> v3:
> - use of 'c' and 'p' requires 'I'
>
> v2:
> - pass ptr+1 to print_ip_arg per Namhyung's comments
> - added field length checks to sockaddr function
>
> Signed-off-by: David Ahern <dsahern@gmail.com>
> Cc: Namhyung Kim <namhyung@kernel.org>
> Cc: Jiri Olsa <jolsa@kernel.org>
> Cc: Steven Rostedt <rostedt@goodmis.org>
> ---
> tools/lib/traceevent/event-parse.c | 328 +++++++++++++++++++++++++++++++++++++
> 1 file changed, 328 insertions(+)
>
> diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
> index cf3a44bf1ec3..afe20ed9fac8 100644
> --- a/tools/lib/traceevent/event-parse.c
> +++ b/tools/lib/traceevent/event-parse.c
> @@ -32,6 +32,7 @@
> #include <stdint.h>
> #include <limits.h>
>
> +#include <netinet/ip6.h>
> #include "event-parse.h"
> #include "event-utils.h"
>
> @@ -4149,6 +4150,324 @@ static void print_mac_arg(struct trace_seq *s, int mac, void *data, int size,
> trace_seq_printf(s, fmt, buf[0], buf[1], buf[2], buf[3], buf[4], buf[5]);
> }
>
> +static void print_ip4_addr(struct trace_seq *s, char i, unsigned char *buf)
> +{
> + const char *fmt;
> +
> + if (i == 'i')
> + fmt = "%03d.%03d.%03d.%03d";
> + else
> + fmt = "%d.%d.%d.%d";
> +
> + trace_seq_printf(s, fmt, buf[0], buf[1], buf[2], buf[3]);
> +}
> +
> +static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
> +{
> + return ((unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) |
> + (unsigned long)(a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0UL;
> +}
> +
> +static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
> +{
> + return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
> +}
> +
> +static void print_ip6c_addr(struct trace_seq *s, unsigned char *addr)
> +{
> + int i, j, range;
> + unsigned char zerolength[8];
> + int longest = 1;
> + int colonpos = -1;
> + uint16_t word;
> + uint8_t hi, lo;
> + bool needcolon = false;
> + bool useIPv4;
> + struct in6_addr in6;
> +
> + memcpy(&in6, addr, sizeof(struct in6_addr));
> +
> + useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6);
> +
> + memset(zerolength, 0, sizeof(zerolength));
> +
> + if (useIPv4)
> + range = 6;
> + else
> + range = 8;
> +
> + /* find position of longest 0 run */
> + for (i = 0; i < range; i++) {
> + for (j = i; j < range; j++) {
> + if (in6.s6_addr16[j] != 0)
> + break;
> + zerolength[i]++;
> + }
> + }
> + for (i = 0; i < range; i++) {
> + if (zerolength[i] > longest) {
> + longest = zerolength[i];
> + colonpos = i;
> + }
> + }
> + if (longest == 1) /* don't compress a single 0 */
> + colonpos = -1;
> +
> + /* emit address */
> + for (i = 0; i < range; i++) {
> + if (i == colonpos) {
> + if (needcolon || i == 0)
> + trace_seq_printf(s, ":");
> + trace_seq_printf(s, ":");
> + needcolon = false;
> + i += longest - 1;
> + continue;
> + }
> + if (needcolon) {
> + trace_seq_printf(s, ":");
> + needcolon = false;
> + }
> + /* hex u16 without leading 0s */
> + word = ntohs(in6.s6_addr16[i]);
> + hi = word >> 8;
> + lo = word & 0xff;
> + if (hi)
> + trace_seq_printf(s, "%x%02x", hi, lo);
> + else
> + trace_seq_printf(s, "%x", lo);
> +
> + needcolon = true;
> + }
> +
> + if (useIPv4) {
> + if (needcolon)
> + trace_seq_printf(s, ":");
> + print_ip4_addr(s, 'I', &in6.s6_addr[12]);
> + }
> +
> + return;
> +}
> +
> +static void print_ip6_addr(struct trace_seq *s, char i, unsigned char *buf)
> +{
> + int j;
> +
> + for (j = 0; j < 16; j += 2) {
> + trace_seq_printf(s, "%02x%02x", buf[j], buf[j+1]);
> + if (i == 'I' && j < 14)
> + trace_seq_printf(s, ":");
> + }
> +}
> +
> +/*
> + * %pi4 print an IPv4 address with leading zeros
> + * %pI4 print an IPv4 address without leading zeros
> + * %pi6 print an IPv6 address without colons
> + * %pI6 print an IPv6 address with colons
> + * %pI6c print an IPv6 address in compressed form with colons
> + * %pISpc print an IP address based on sockaddr; p adds port.
> + */
> +static int print_ipv4_arg(struct trace_seq *s, const char *ptr, char i,
> + void *data, int size, struct event_format *event,
> + struct print_arg *arg)
> +{
> + unsigned char *buf;
> +
> + if (arg->type == PRINT_FUNC) {
> + process_defined_func(s, data, size, event, arg);
> + return 0;
> + }
> +
> + if (arg->type != PRINT_FIELD) {
> + trace_seq_printf(s, "ARG TYPE NOT FIELD BUT %d", arg->type);
> + return 0;
> + }
> +
> + if (!arg->field.field) {
> + arg->field.field =
> + pevent_find_any_field(event, arg->field.name);
> + if (!arg->field.field) {
> + do_warning("%s: field %s not found",
> + __func__, arg->field.name);
> + return 0;
> + }
> + }
> +
> + buf = data + arg->field.field->offset;
> +
> + if (arg->field.field->size != 4) {
> + trace_seq_printf(s, "INVALIDIPv4");
> + return 0;
> + }
> + print_ip4_addr(s, i, buf);
> +
> + return 0;
> +}
> +
> +static int print_ipv6_arg(struct trace_seq *s, const char *ptr, char i,
> + void *data, int size, struct event_format *event,
> + struct print_arg *arg)
> +{
> + char have_c = 0;
> + unsigned char *buf;
> + int rc = 0;
> +
> + /* pI6c */
> + if (i == 'I' && *ptr == 'c') {
> + have_c = 1;
> + ptr++;
> + rc++;
> + }
> +
> + if (arg->type == PRINT_FUNC) {
> + process_defined_func(s, data, size, event, arg);
> + return rc;
> + }
> +
> + if (arg->type != PRINT_FIELD) {
> + trace_seq_printf(s, "ARG TYPE NOT FIELD BUT %d", arg->type);
> + return rc;
> + }
> +
> + if (!arg->field.field) {
> + arg->field.field =
> + pevent_find_any_field(event, arg->field.name);
> + if (!arg->field.field) {
> + do_warning("%s: field %s not found",
> + __func__, arg->field.name);
> + return rc;
> + }
> + }
> +
> + buf = data + arg->field.field->offset;
> +
> + if (arg->field.field->size != 16) {
> + trace_seq_printf(s, "INVALIDIPv6");
> + return rc;
> + }
> +
> + if (have_c)
> + print_ip6c_addr(s, buf);
> + else
> + print_ip6_addr(s, i, buf);
> +
> + return rc;
> +}
> +
> +static int print_ipsa_arg(struct trace_seq *s, const char *ptr, char i,
> + void *data, int size, struct event_format *event,
> + struct print_arg *arg)
> +{
> + char have_c = 0, have_p = 0;
> + unsigned char *buf;
> + struct sockaddr_storage *sa;
> + int rc = 0;
> +
> + /* pISpc */
> + if (i == 'I') {
> + if (*ptr == 'p') {
> + have_p = 1;
> + ptr++;
> + rc++;
> + }
> + if (*ptr == 'c') {
> + have_c = 1;
> + ptr++;
> + rc++;
> + }
> + }
> +
> + if (arg->type == PRINT_FUNC) {
> + process_defined_func(s, data, size, event, arg);
> + return rc;
> + }
> +
> + if (arg->type != PRINT_FIELD) {
> + trace_seq_printf(s, "ARG TYPE NOT FIELD BUT %d", arg->type);
> + return rc;
> + }
> +
> + if (!arg->field.field) {
> + arg->field.field =
> + pevent_find_any_field(event, arg->field.name);
> + if (!arg->field.field) {
> + do_warning("%s: field %s not found",
> + __func__, arg->field.name);
> + return rc;
> + }
> + }
> +
> + sa = (struct sockaddr_storage *) (data + arg->field.field->offset);
> +
> + if (sa->ss_family == AF_INET) {
> + struct sockaddr_in *sa4 = (struct sockaddr_in *) sa;
> +
> + if (arg->field.field->size < sizeof(struct sockaddr_in)) {
> + trace_seq_printf(s, "INVALIDIPv4");
> + return rc;
> + }
> +
> + print_ip4_addr(s, i, (unsigned char *) &sa4->sin_addr);
> + if (have_p)
> + trace_seq_printf(s, ":%d", ntohs(sa4->sin_port));
> +
> +
> + } else if (sa->ss_family == AF_INET6) {
> + struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) sa;
> +
> + if (arg->field.field->size < sizeof(struct sockaddr_in6)) {
> + trace_seq_printf(s, "INVALIDIPv6");
> + return rc;
> + }
> +
> + if (have_p)
> + trace_seq_printf(s, "[");
> +
> + buf = (unsigned char *) &sa6->sin6_addr;
> + if (have_c)
> + print_ip6c_addr(s, buf);
> + else
> + print_ip6_addr(s, i, buf);
> +
> + if (have_p)
> + trace_seq_printf(s, "]:%d", ntohs(sa6->sin6_port));
> + }
> +
> + return rc;
> +}
> +
> +static int print_ip_arg(struct trace_seq *s, const char *ptr,
> + void *data, int size, struct event_format *event,
> + struct print_arg *arg)
> +{
> + char i = *ptr; /* 'i' or 'I' */
> + char ver;
> + int rc = 0;
> +
> + ptr++;
> + rc++;
> +
> + ver = *ptr;
> + ptr++;
> + rc++;
> +
> + switch (ver) {
> + case '4':
> + rc += print_ipv4_arg(s, ptr, i, data, size, event, arg);
> + break;
> + case '6':
> + rc += print_ipv6_arg(s, ptr, i, data, size, event, arg);
> + break;
> + case 'S':
> + rc += print_ipsa_arg(s, ptr, i, data, size, event, arg);
> + break;
> + default:
> + return 0;
> + }
> +
> + return rc;
> +}
> +
> static int is_printable_array(char *p, unsigned int len)
> {
> unsigned int i;
> @@ -4337,6 +4656,15 @@ static void pretty_print(struct trace_seq *s, void *data, int size, struct event
> ptr++;
> arg = arg->next;
> break;
> + } else if (*(ptr+1) == 'I' || *(ptr+1) == 'i') {
> + int n;
> +
> + n = print_ip_arg(s, ptr+1, data, size, event, arg);
> + if (n > 0) {
> + ptr += n;
> + arg = arg->next;
> + break;
> + }
> }
>
> /* fall through */
>



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