From: David Gibson
Implement serialisation of our current forwarding rules in conf.c,
deserialising it to display in the pesto client. Doing this requires
adding ip.c, inany.c, bitmap.c, lineread.c and fwd_rule.c to the pesto
build. With previous preparations that now requires only a trivial change
to lineread.c.
Signed-off-by: David Gibson
Reviewed-by: Laurent Vivier
[sbrivio: Use ntohs() for rule->to instead of htons() in
fwd_rule_read(), reported by Jon Maloy]
[sbrivio: Add upper bound check on pc->fwd.count for count of rules
received by pesto, reported missing by Laurent, plus nits also
reported by Laurent]
[sbrivio: Fix conflicts in Makefile]
Signed-off-by: Stefano Brivio
---
Makefile | 2 +-
conf.c | 12 +++++++++++-
fwd_rule.c | 40 ++++++++++++++++++++++++++++++++++++++++
fwd_rule.h | 4 ++++
lineread.c | 2 +-
pesto.c | 38 ++++++++++++++++++++++++++++++++++++--
pesto.h | 6 ++++++
7 files changed, 99 insertions(+), 5 deletions(-)
diff --git a/Makefile b/Makefile
index b1003d8..5e91da1 100644
--- a/Makefile
+++ b/Makefile
@@ -45,7 +45,7 @@ PASST_SRCS = arch.c arp.c bitmap.c checksum.c conf.c dhcp.c dhcpv6.c \
vhost_user.c virtio.c vu_common.c
QRAP_SRCS = qrap.c
PASST_REPAIR_SRCS = passt-repair.c
-PESTO_SRCS = pesto.c serialise.c
+PESTO_SRCS = pesto.c bitmap.c fwd_rule.c inany.c ip.c lineread.c serialise.c
SRCS = $(PASST_SRCS) $(QRAP_SRCS) $(PASST_REPAIR_SRCS) $(PESTO_SRCS)
MANPAGES = passt.1 pasta.1 pesto.1 qrap.1 passt-repair.1
diff --git a/conf.c b/conf.c
index e5d97bc..26e16ec 100644
--- a/conf.c
+++ b/conf.c
@@ -1943,21 +1943,30 @@ static int conf_send_rules(const struct ctx *c, int fd)
unsigned pif;
for (pif = 0; pif < PIF_NUM_TYPES; pif++) {
+ struct fwd_table *fwd = c->fwd[pif];
struct pesto_pif_info info = { 0 };
+ unsigned i;
int rc;
- if (!c->fwd[pif])
+ if (!fwd)
continue;
assert(pif != PIF_NONE);
rc = snprintf(info.name, sizeof(info.name), "%s", pif_name(pif));
assert(rc >= 0 && (size_t)rc < sizeof(info.name));
+ info.caps = htonl(fwd->caps);
+ info.count = htonl(fwd->count);
if (write_u8(fd, pif) < 0)
return -1;
if (write_all_buf(fd, &info, sizeof(info)) < 0)
return -1;
+
+ for (i = 0; i < fwd->count; i++) {
+ if (fwd_rule_write(fd, &fwd->rules[i]))
+ return -1;
+ }
}
if (write_u8(fd, PIF_NONE) < 0)
@@ -2010,6 +2019,7 @@ static void conf_accept(struct ctx *c)
.magic = PESTO_SERVER_MAGIC,
.version = htonl(PESTO_PROTOCOL_VERSION),
.pif_name_size = htonl(PIF_NAME_SIZE),
+ .ifnamsiz = htonl(IFNAMSIZ),
};
union epoll_ref ref = { .type = EPOLL_TYPE_CONF };
struct ucred uc = { 0 };
diff --git a/fwd_rule.c b/fwd_rule.c
index 7fd20dd..c2824d5 100644
--- a/fwd_rule.c
+++ b/fwd_rule.c
@@ -24,6 +24,7 @@
#include "fwd_rule.h"
#include "lineread.h"
#include "log.h"
+#include "serialise.h"
/* Ephemeral port range: values from RFC 6335 */
static in_port_t fwd_ephemeral_min = (1 << 15) + (1 << 14);
@@ -645,3 +646,42 @@ void fwd_rule_parse(char optname, const char *optarg, struct fwd_table *fwd)
fwd_rule_parse_ports(fwd, proto, addr, ifname, spec);
}
+
+/**
+ * fwd_rule_read() - Read serialised rule from an fd
+ * @fd: fd to deserialise from
+ * @rule: Buffer to store rule into
+ *
+ * Return: 0 on success, -1 on error (with errno set)
+ */
+int fwd_rule_read(int fd, struct fwd_rule *rule)
+{
+ if (read_all_buf(fd, rule, sizeof(*rule)))
+ return -1;
+
+ /* Byteswap for host */
+ rule->first = ntohs(rule->first);
+ rule->last = ntohs(rule->last);
+ rule->to = ntohs(rule->to);
+
+ return 0;
+}
+
+/**
+ * fwd_rule_write() - Serialise rule to an fd
+ * @fd: fd to serialise to
+ * @rule: Rule to send
+ *
+ * Return: 0 on success, -1 on error (with errno set)
+ */
+int fwd_rule_write(int fd, const struct fwd_rule *rule)
+{
+ struct fwd_rule tmp = *rule;
+
+ /* Byteswap for transport */
+ tmp.first = htons(tmp.first);
+ tmp.last = htons(tmp.last);
+ tmp.to = htons(tmp.to);
+
+ return write_all_buf(fd, &tmp, sizeof(tmp));
+}
diff --git a/fwd_rule.h b/fwd_rule.h
index f51f1b4..330d49e 100644
--- a/fwd_rule.h
+++ b/fwd_rule.h
@@ -29,6 +29,8 @@
#define FWD_CAP_UDP BIT(3)
#define FWD_CAP_SCAN BIT(4)
#define FWD_CAP_IFNAME BIT(5)
+#define FWD_CAP_ALL (FWD_CAP_IPV4 | FWD_CAP_IPV6 | FWD_CAP_TCP | \
+ FWD_CAP_UDP | FWD_CAP_SCAN | FWD_CAP_IFNAME)
/**
* struct fwd_rule - Forwarding rule governing a range of ports
@@ -99,6 +101,8 @@ void fwd_probe_ephemeral(void);
const union inany_addr *fwd_rule_addr(const struct fwd_rule *rule);
const char *fwd_rule_fmt(const struct fwd_rule *rule, char *dst, size_t size);
void fwd_rule_parse(char optname, const char *optarg, struct fwd_table *fwd);
+int fwd_rule_read(int fd, struct fwd_rule *rule);
+int fwd_rule_write(int fd, const struct fwd_rule *rule);
/**
* fwd_rules_dump() - Dump forwarding rules
diff --git a/lineread.c b/lineread.c
index b9ceae1..a4269a6 100644
--- a/lineread.c
+++ b/lineread.c
@@ -19,8 +19,8 @@
#include
#include
+#include "common.h"
#include "lineread.h"
-#include "util.h"
/**
* lineread_init() - Prepare for line by line file reading without allocation
diff --git a/pesto.c b/pesto.c
index b33492a..92a8cb2 100644
--- a/pesto.c
+++ b/pesto.c
@@ -34,6 +34,7 @@
#include "common.h"
#include "seccomp_pesto.h"
#include "serialise.h"
+#include "fwd_rule.h"
#include "pesto.h"
#include "log.h"
@@ -66,6 +67,7 @@ static void usage(const char *name, FILE *f, int status)
struct pif_configuration {
uint8_t pif;
char name[PIF_NAME_SIZE];
+ struct fwd_table fwd;
};
struct configuration {
@@ -123,6 +125,7 @@ static bool read_pif_conf(int fd, struct configuration *conf)
struct pif_configuration *pc;
struct pesto_pif_info info;
uint8_t pif;
+ unsigned i;
if (read_u8(fd, &pif) < 0)
die("Error reading from control socket");
@@ -151,8 +154,20 @@ static bool read_pif_conf(int fd, struct configuration *conf)
static_assert(sizeof(info.name) == sizeof(pc->name),
"Mismatching pif name lengths");
memcpy(pc->name, info.name, sizeof(pc->name));
+ pc->fwd.caps = ntohl(info.caps);
+
+ pc->fwd.count = ntohl(info.count);
+ if (pc->fwd.count > MAX_FWD_RULES)
+ die("Too many forwarding rules");
- debug("PIF %"PRIu8": %s", pc->pif, pc->name);
+ debug("PIF %"PRIu8": %s, %"PRIu32" rules, capabilities 0x%"PRIx32
+ ":%s%s%s%s%s%s", pc->pif, pc->name, pc->fwd.count, pc->fwd.caps,
+ pc->fwd.caps & FWD_CAP_IPV4 ? " IPv4" : "",
+ pc->fwd.caps & FWD_CAP_IPV6 ? " IPv6" : "",
+ pc->fwd.caps & FWD_CAP_TCP ? " TCP" : "",
+ pc->fwd.caps & FWD_CAP_UDP ? " UDP" : "",
+ pc->fwd.caps & FWD_CAP_SCAN ? " scan" : "",
+ pc->fwd.caps & FWD_CAP_IFNAME ? " ifname" : "");
/* O(n^2), but n is bounded by MAX_PIFS */
if (pif_conf_by_num(conf, pc->pif))
@@ -162,6 +177,18 @@ static bool read_pif_conf(int fd, struct configuration *conf)
if (pif_conf_by_name(conf, pc->name))
die("Received duplicate interface name");
+ /* NOTE: We read the fwd rules directly into fwd.rules, rather than
+ * using fwd_rule_add(). This means we can read and display rules even
+ * if something has gone wrong (in pesto or passt) and we get rules that
+ * fwd_rule_add() would reject. It does have the side effect that we
+ * never assign socket space for the fwd rules, but we don't need that
+ * within pesto.
+ */
+ for (i = 0; i < pc->fwd.count; i++) {
+ if (fwd_rule_read(fd, &pc->fwd.rules[i]) < 0)
+ die("Error reading from control socket");
+ }
+
conf->npifs++;
return true;
}
@@ -177,7 +204,8 @@ static void show_conf(const struct configuration *conf)
for (i = 0; i < conf->npifs; i++) {
const struct pif_configuration *pc = &conf->pif[i];
printf(" %s\n", pc->name);
- printf(" TBD\n");
+ fwd_rules_dump(printf, pc->fwd.rules, pc->fwd.count,
+ " ", "\n");
}
}
@@ -290,6 +318,12 @@ int main(int argc, char **argv)
ntohl(hello.pif_name_size), PIF_NAME_SIZE);
}
+ if (ntohl(hello.ifnamsiz) != IFNAMSIZ) {
+ die("Server has unexpected IFNAMSIZ (%"
+ PRIu32" not %"PRIu32 ")",
+ ntohl(hello.ifnamsiz), IFNAMSIZ);
+ }
+
while (read_pif_conf(s, &conf))
;
diff --git a/pesto.h b/pesto.h
index fda0ef6..980cc17 100644
--- a/pesto.h
+++ b/pesto.h
@@ -26,11 +26,13 @@
* @magic: PESTO_SERVER_MAGIC
* @version: Version number
* @pif_name_size: Server's value for PIF_NAME_SIZE
+ * @ifnamsiz: Server's value for IFNAMSIZ
*/
struct pesto_hello {
char magic[8];
uint32_t version;
uint32_t pif_name_size;
+ uint32_t ifnamsiz;
} __attribute__ ((__packed__));
static_assert(sizeof(PESTO_SERVER_MAGIC)
@@ -40,9 +42,13 @@ static_assert(sizeof(PESTO_SERVER_MAGIC)
/**
* struct pesto_pif_info - Message with basic metadata about a pif
* @name: Name (\0 terminated)
+ * @caps: Forwarding capabilities for this pif
+ * @count: Number of forwarding rules for this pif
*/
struct pesto_pif_info {
char name[PIF_NAME_SIZE];
+ uint32_t caps;
+ uint32_t count;
} __attribute__ ((__packed__));
#endif /* PESTO_H */
--
2.43.0