summaryrefslogtreecommitdiff
path: root/src/libsystemd-network/sd-ndisc.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/libsystemd-network/sd-ndisc.c')
-rw-r--r--src/libsystemd-network/sd-ndisc.c119
1 files changed, 81 insertions, 38 deletions
diff --git a/src/libsystemd-network/sd-ndisc.c b/src/libsystemd-network/sd-ndisc.c
index c494b9d6d8..f35b3a33b8 100644
--- a/src/libsystemd-network/sd-ndisc.c
+++ b/src/libsystemd-network/sd-ndisc.c
@@ -29,6 +29,7 @@
#include "alloc-util.h"
#include "async.h"
#include "icmp6-util.h"
+#include "in-addr-util.h"
#include "list.h"
#include "socket-util.h"
@@ -47,6 +48,12 @@ enum NDiscState {
#define ICMP6_RECV_SIZE (IP6_MIN_MTU - sizeof(struct ip6_hdr))
#define NDISC_OPT_LEN_UNITS 8
+#define ND_RA_FLAG_PREF 0x18
+#define ND_RA_FLAG_PREF_LOW 0x03
+#define ND_RA_FLAG_PREF_MEDIUM 0x0
+#define ND_RA_FLAG_PREF_HIGH 0x1
+#define ND_RA_FLAG_PREF_INVALID 0x2
+
typedef struct NDiscPrefix NDiscPrefix;
struct NDiscPrefix {
@@ -75,6 +82,9 @@ struct sd_ndisc {
sd_event_source *recv;
sd_event_source *timeout;
int nd_sent;
+ sd_ndisc_router_callback_t router_callback;
+ sd_ndisc_prefix_autonomous_callback_t prefix_autonomous_callback;
+ sd_ndisc_prefix_onlink_callback_t prefix_onlink_callback;
sd_ndisc_callback_t callback;
void *userdata;
};
@@ -119,15 +129,17 @@ static int ndisc_prefix_new(sd_ndisc *nd, NDiscPrefix **ret) {
return 0;
}
-static void ndisc_notify(sd_ndisc *nd, int event) {
- if (nd->callback)
- nd->callback(nd, event, nd->userdata);
-}
-
-int sd_ndisc_set_callback(sd_ndisc *nd, sd_ndisc_callback_t callback,
- void *userdata) {
+int sd_ndisc_set_callback(sd_ndisc *nd,
+ sd_ndisc_router_callback_t router_callback,
+ sd_ndisc_prefix_onlink_callback_t prefix_onlink_callback,
+ sd_ndisc_prefix_autonomous_callback_t prefix_autonomous_callback,
+ sd_ndisc_callback_t callback,
+ void *userdata) {
assert(nd);
+ nd->router_callback = router_callback;
+ nd->prefix_onlink_callback = prefix_onlink_callback;
+ nd->prefix_autonomous_callback = prefix_autonomous_callback;
nd->callback = callback;
nd->userdata = userdata;
@@ -320,7 +332,7 @@ static int ndisc_prefix_match(sd_ndisc *nd, const struct in6_addr *addr,
static int ndisc_prefix_update(sd_ndisc *nd, ssize_t len,
const struct nd_opt_prefix_info *prefix_opt) {
NDiscPrefix *prefix;
- uint32_t lifetime;
+ uint32_t lifetime_valid, lifetime_preferred;
usec_t time_now;
char time_string[FORMAT_TIMESPAN_MAX];
int r;
@@ -331,10 +343,17 @@ static int ndisc_prefix_update(sd_ndisc *nd, ssize_t len,
if (len < prefix_opt->nd_opt_pi_len)
return -ENOMSG;
- if (!(prefix_opt->nd_opt_pi_flags_reserved & ND_OPT_PI_FLAG_ONLINK))
+ if (!(prefix_opt->nd_opt_pi_flags_reserved & (ND_OPT_PI_FLAG_ONLINK | ND_OPT_PI_FLAG_AUTO)))
+ return 0;
+
+ if (in_addr_is_link_local(AF_INET6, (const union in_addr_union *) &prefix_opt->nd_opt_pi_prefix) > 0)
return 0;
- lifetime = be32toh(prefix_opt->nd_opt_pi_valid_time);
+ lifetime_valid = be32toh(prefix_opt->nd_opt_pi_valid_time);
+ lifetime_preferred = be32toh(prefix_opt->nd_opt_pi_preferred_time);
+
+ if (lifetime_valid < lifetime_preferred)
+ return 0;
r = ndisc_prefix_match(nd, &prefix_opt->nd_opt_pi_prefix,
prefix_opt->nd_opt_pi_prefix_len, &prefix);
@@ -357,8 +376,8 @@ static int ndisc_prefix_update(sd_ndisc *nd, ssize_t len,
log_ndisc(nd, "New prefix "SD_NDISC_ADDRESS_FORMAT_STR"/%d lifetime %d expires in %s",
SD_NDISC_ADDRESS_FORMAT_VAL(prefix->addr),
- prefix->len, lifetime,
- format_timespan(time_string, FORMAT_TIMESPAN_MAX, lifetime * USEC_PER_SEC, USEC_PER_SEC));
+ prefix->len, lifetime_valid,
+ format_timespan(time_string, FORMAT_TIMESPAN_MAX, lifetime_valid * USEC_PER_SEC, USEC_PER_SEC));
LIST_PREPEND(prefixes, nd->prefixes, prefix);
@@ -378,17 +397,24 @@ static int ndisc_prefix_update(sd_ndisc *nd, ssize_t len,
log_ndisc(nd, "Update prefix "SD_NDISC_ADDRESS_FORMAT_STR"/%d lifetime %d expires in %s",
SD_NDISC_ADDRESS_FORMAT_VAL(prefix->addr),
- prefix->len, lifetime,
- format_timespan(time_string, FORMAT_TIMESPAN_MAX, lifetime * USEC_PER_SEC, USEC_PER_SEC));
+ prefix->len, lifetime_valid,
+ format_timespan(time_string, FORMAT_TIMESPAN_MAX, lifetime_valid * USEC_PER_SEC, USEC_PER_SEC));
}
r = sd_event_now(nd->event, clock_boottime_or_monotonic(), &time_now);
if (r < 0)
return r;
- prefix->valid_until = time_now + lifetime * USEC_PER_SEC;
+ prefix->valid_until = time_now + lifetime_valid * USEC_PER_SEC;
- return r;
+ if ((prefix_opt->nd_opt_pi_flags_reserved & ND_OPT_PI_FLAG_ONLINK) && nd->prefix_onlink_callback)
+ nd->prefix_onlink_callback(nd, &prefix->addr, prefix->len, prefix->valid_until, nd->userdata);
+
+ if ((prefix_opt->nd_opt_pi_flags_reserved & ND_OPT_PI_FLAG_AUTO) && nd->prefix_autonomous_callback)
+ nd->prefix_autonomous_callback(nd, &prefix->addr, prefix->len, lifetime_preferred, lifetime_valid,
+ nd->userdata);
+
+ return 0;
}
static int ndisc_ra_parse(sd_ndisc *nd, struct nd_router_advert *ra,
@@ -453,11 +479,13 @@ static int ndisc_ra_parse(sd_ndisc *nd, struct nd_router_advert *ra,
}
static int ndisc_router_advertisment_recv(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
+ _cleanup_free_ struct nd_router_advert *ra = NULL;
sd_ndisc *nd = userdata;
- int r, buflen = 0;
+ int r, buflen = 0, pref, stateful;
+ union sockaddr_union router = {};
+ socklen_t router_len = sizeof(router);
+ unsigned lifetime;
ssize_t len;
- _cleanup_free_ struct nd_router_advert *ra = NULL;
- int event = SD_NDISC_EVENT_ROUTER_ADVERTISMENT_NONE;
assert(s);
assert(nd);
@@ -471,9 +499,12 @@ static int ndisc_router_advertisment_recv(sd_event_source *s, int fd, uint32_t r
if (!ra)
return -ENOMEM;
- len = read(fd, ra, buflen);
+ len = recvfrom(fd, ra, buflen, 0, &router.sa, &router_len);
if (len < 0) {
- log_ndisc(nd, "Could not receive message from UDP socket: %m");
+ log_ndisc(nd, "Could not receive message from ICMPv6 socket: %m");
+ return 0;
+ } else if (router_len != sizeof(router.in6) && router_len != 0) {
+ log_ndisc(nd, "Received invalid source address size from ICMPv6 socket: %zu bytes", (size_t)router_len);
return 0;
}
@@ -487,26 +518,33 @@ static int ndisc_router_advertisment_recv(sd_event_source *s, int fd, uint32_t r
nd->state = NDISC_STATE_ADVERTISMENT_LISTEN;
- if (ra->nd_ra_flags_reserved & ND_RA_FLAG_OTHER )
- event = SD_NDISC_EVENT_ROUTER_ADVERTISMENT_OTHER;
+ stateful = ra->nd_ra_flags_reserved & (ND_RA_FLAG_MANAGED | ND_RA_FLAG_OTHER);
+ pref = ra->nd_ra_flags_reserved & ND_RA_FLAG_PREF >> 3;
- if (ra->nd_ra_flags_reserved & ND_RA_FLAG_MANAGED)
- event = SD_NDISC_EVENT_ROUTER_ADVERTISMENT_MANAGED;
+ switch (pref) {
+ case ND_RA_FLAG_PREF_LOW:
+ case ND_RA_FLAG_PREF_HIGH:
+ break;
+ default:
+ pref = ND_RA_FLAG_PREF_MEDIUM;
+ break;
+ }
- log_ndisc(nd, "Received Router Advertisement flags %s/%s",
- ra->nd_ra_flags_reserved & ND_RA_FLAG_MANAGED? "MANAGED": "none",
- ra->nd_ra_flags_reserved & ND_RA_FLAG_OTHER? "OTHER": "none");
+ lifetime = be16toh(ra->nd_ra_router_lifetime);
- if (event != SD_NDISC_EVENT_ROUTER_ADVERTISMENT_NONE) {
- r = ndisc_ra_parse(nd, ra, len);
- if (r < 0) {
- log_ndisc(nd, "Could not parse Router Advertisement: %s",
- strerror(-r));
- return 0;
- }
+ log_ndisc(nd, "Received Router Advertisement: flags %s preference %s lifetime %u sec",
+ stateful & ND_RA_FLAG_MANAGED ? "MANAGED" : stateful & ND_RA_FLAG_OTHER ? "OTHER" : "none",
+ pref == ND_RA_FLAG_PREF_HIGH ? "high" : pref == ND_RA_FLAG_PREF_LOW ? "low" : "medium",
+ lifetime);
+
+ r = ndisc_ra_parse(nd, ra, len);
+ if (r < 0) {
+ log_ndisc(nd, "Could not parse Router Advertisement: %s", strerror(-r));
+ return 0;
}
- ndisc_notify(nd, event);
+ if (nd->router_callback)
+ nd->router_callback(nd, stateful, router_len != 0 ? &router.in6.sin6_addr : NULL, lifetime, pref, nd->userdata);
return 0;
}
@@ -525,7 +563,8 @@ static int ndisc_router_solicitation_timeout(sd_event_source *s, uint64_t usec,
nd->timeout = sd_event_source_unref(nd->timeout);
if (nd->nd_sent >= NDISC_MAX_ROUTER_SOLICITATIONS) {
- ndisc_notify(nd, SD_NDISC_EVENT_ROUTER_ADVERTISMENT_TIMEOUT);
+ if (nd->callback)
+ nd->callback(nd, SD_NDISC_EVENT_TIMEOUT, nd->userdata);
nd->state = NDISC_STATE_ADVERTISMENT_LISTEN;
} else {
if (memcmp(&nd->mac_addr, &unset, sizeof(struct ether_addr)))
@@ -549,7 +588,8 @@ static int ndisc_router_solicitation_timeout(sd_event_source *s, uint64_t usec,
next_timeout, 0,
ndisc_router_solicitation_timeout, nd);
if (r < 0) {
- ndisc_notify(nd, r);
+ /* we cannot continue if we are unable to rearm the timer */
+ sd_ndisc_stop(nd);
return 0;
}
@@ -575,6 +615,9 @@ int sd_ndisc_stop(sd_ndisc *nd) {
nd->state = NDISC_STATE_IDLE;
+ if (nd->callback)
+ nd->callback(nd, SD_NDISC_EVENT_STOP, nd->userdata);
+
return 0;
}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-20 01:23:14 +0000