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netif: ensure netif_set_addr() only results in one "ext_status_callback"

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This can be used e.g. in mdns to create one, not multiple "changed" triggers
if IP address and netmask change at the same time.
This commit is contained in:
goldsimon 2018-01-12 23:11:38 +01:00
parent fa75ffed9d
commit 734b6ab57a
3 changed files with 162 additions and 134 deletions
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169
src/core/netif.c
View File

@ -421,28 +421,29 @@ netif_add(struct netif *netif,
}
#if LWIP_IPV4
static void
netif_do_set_ipaddr(struct netif *netif, const ip4_addr_t *ipaddr, u8_t callback)
static int
netif_do_set_ipaddr(struct netif *netif, const ip4_addr_t *ipaddr, ip_addr_t *old_addr)
{
ip_addr_t new_addr;
*ip_2_ip4(&new_addr) = *ipaddr;
IP_SET_TYPE_VAL(new_addr, IPADDR_TYPE_V4);
LWIP_ASSERT("invalid pointer", ipaddr != NULL);
LWIP_ASSERT("invalid pointer", old_addr != NULL);
/* address is actually being changed? */
if (ip4_addr_cmp(ip_2_ip4(&new_addr), netif_ip4_addr(netif)) == 0) {
ip_addr_t old_addr;
ip_addr_copy(old_addr, *netif_ip_addr4(netif));
if (ip4_addr_cmp(ipaddr, netif_ip4_addr(netif)) == 0) {
ip_addr_t new_addr;
*ip_2_ip4(&new_addr) = *ipaddr;
IP_SET_TYPE_VAL(new_addr, IPADDR_TYPE_V4);
ip_addr_copy(*old_addr, *netif_ip_addr4(netif));
LWIP_DEBUGF(NETIF_DEBUG | LWIP_DBG_STATE, ("netif_set_ipaddr: netif address being changed\n"));
#if LWIP_TCP
tcp_netif_ip_addr_changed(&old_addr, &new_addr);
tcp_netif_ip_addr_changed(old_addr, &new_addr);
#endif /* LWIP_TCP */
#if LWIP_UDP
udp_netif_ip_addr_changed(&old_addr, &new_addr);
udp_netif_ip_addr_changed(old_addr, &new_addr);
#endif /* LWIP_UDP */
#if LWIP_RAW
raw_netif_ip_addr_changed(&old_addr, &new_addr);
raw_netif_ip_addr_changed(old_addr, &new_addr);
#endif /* LWIP_RAW */
mib2_remove_ip4(netif);
@ -456,14 +457,9 @@ netif_do_set_ipaddr(struct netif *netif, const ip4_addr_t *ipaddr, u8_t callback
netif_issue_reports(netif, NETIF_REPORT_TYPE_IPV4);
NETIF_STATUS_CALLBACK(netif);
if (callback) {
#if LWIP_NETIF_EXT_STATUS_CALLBACK
netif_ext_callback_args_t args;
args.ipv4_changed.old_address = &old_addr;
netif_invoke_ext_callback(netif, LWIP_NSC_IPV4_ADDRESS_CHANGED, &args);
#endif
}
return 1; /* address changed */
}
return 0; /* address unchanged */
}
/**
@ -479,6 +475,7 @@ netif_do_set_ipaddr(struct netif *netif, const ip4_addr_t *ipaddr, u8_t callback
void
netif_set_ipaddr(struct netif *netif, const ip4_addr_t *ipaddr)
{
ip_addr_t old_addr;
/* Don't propagate NULL pointer (IPv4 ANY) to subsequent functions */
if (ipaddr == NULL) {
ipaddr = IP4_ADDR_ANY4;
@ -486,21 +483,26 @@ netif_set_ipaddr(struct netif *netif, const ip4_addr_t *ipaddr)
LWIP_ASSERT_CORE_LOCKED();
netif_do_set_ipaddr(netif, ipaddr, 1);
if (netif_do_set_ipaddr(netif, ipaddr, &old_addr)) {
#if LWIP_NETIF_EXT_STATUS_CALLBACK
netif_ext_callback_args_t args;
args.ipv4_changed.old_address = &old_addr;
netif_invoke_ext_callback(netif, LWIP_NSC_IPV4_ADDRESS_CHANGED, &args);
#endif
}
}
static void
netif_do_set_netmask(struct netif *netif, const ip4_addr_t *netmask, u8_t callback)
static int
netif_do_set_netmask(struct netif *netif, const ip4_addr_t *netmask, ip_addr_t *old_nm)
{
/* address is actually being changed? */
if (ip4_addr_cmp(netmask, netif_ip4_netmask(netif)) == 0) {
#if LWIP_NETIF_EXT_STATUS_CALLBACK
netif_ext_callback_args_t args;
ip_addr_t old_addr;
ip_addr_copy(old_addr, *netif_ip_netmask4(netif));
args.ipv4_nm_changed.old_address = &old_addr;
LWIP_ASSERT("invalid pointer", old_nm != NULL);
ip_addr_copy(*old_nm, *netif_ip_netmask4(netif));
#else
LWIP_UNUSED_ARG(old_nm);
#endif
mib2_remove_route_ip4(0, netif);
/* set new netmask to netif */
ip4_addr_set(ip_2_ip4(&netif->netmask), netmask);
@ -512,11 +514,9 @@ netif_do_set_netmask(struct netif *netif, const ip4_addr_t *netmask, u8_t callba
ip4_addr2_16(netif_ip4_netmask(netif)),
ip4_addr3_16(netif_ip4_netmask(netif)),
ip4_addr4_16(netif_ip4_netmask(netif))));
if (callback) {
netif_invoke_ext_callback(netif, LWIP_NSC_IPV4_NETMASK_CHANGED, &args);
}
return 1; /* netmask changed */
}
return 0; /* netmask unchanged */
}
/**
@ -532,6 +532,12 @@ netif_do_set_netmask(struct netif *netif, const ip4_addr_t *netmask, u8_t callba
void
netif_set_netmask(struct netif *netif, const ip4_addr_t *netmask)
{
#if LWIP_NETIF_EXT_STATUS_CALLBACK
ip_addr_t old_nm_val;
ip_addr_t *old_nm = &old_nm_val;
#else
ip_addr_t *old_nm = NULL;
#endif
LWIP_ASSERT_CORE_LOCKED();
/* Don't propagate NULL pointer (IPv4 ANY) to subsequent functions */
@ -539,19 +545,25 @@ netif_set_netmask(struct netif *netif, const ip4_addr_t *netmask)
netmask = IP4_ADDR_ANY4;
}
netif_do_set_netmask(netif, netmask, 1);
if (netif_do_set_netmask(netif, netmask, old_nm)) {
#if LWIP_NETIF_EXT_STATUS_CALLBACK
netif_ext_callback_args_t args;
args.ipv4_changed.old_netmask = old_nm;
netif_invoke_ext_callback(netif, LWIP_NSC_IPV4_NETMASK_CHANGED, &args);
#endif
}
}
static void
netif_do_set_gw(struct netif *netif, const ip4_addr_t *gw, u8_t callback)
static int
netif_do_set_gw(struct netif *netif, const ip4_addr_t *gw, ip_addr_t *old_gw)
{
/* address is actually being changed? */
if (ip4_addr_cmp(gw, netif_ip4_gw(netif)) == 0) {
#if LWIP_NETIF_EXT_STATUS_CALLBACK
netif_ext_callback_args_t args;
ip_addr_t old_addr;
ip_addr_copy(old_addr, *netif_ip_gw4(netif));
args.ipv4_gw_changed.old_address = &old_addr;
LWIP_ASSERT("invalid pointer", old_gw != NULL);
ip_addr_copy(*old_gw, *netif_ip_gw4(netif));
#else
LWIP_UNUSED_ARG(old_gw);
#endif
ip4_addr_set(ip_2_ip4(&netif->gw), gw);
@ -562,11 +574,9 @@ netif_do_set_gw(struct netif *netif, const ip4_addr_t *gw, u8_t callback)
ip4_addr2_16(netif_ip4_gw(netif)),
ip4_addr3_16(netif_ip4_gw(netif)),
ip4_addr4_16(netif_ip4_gw(netif))));
if (callback) {
netif_invoke_ext_callback(netif, LWIP_NSC_IPV4_GATEWAY_CHANGED, &args);
}
return 1; /* gateway changed */
}
return 0; /* gateway unchanged */
}
/**
@ -581,6 +591,12 @@ netif_do_set_gw(struct netif *netif, const ip4_addr_t *gw, u8_t callback)
void
netif_set_gw(struct netif *netif, const ip4_addr_t *gw)
{
#if LWIP_NETIF_EXT_STATUS_CALLBACK
ip_addr_t old_gw_val;
ip_addr_t *old_gw = &old_gw_val;
#else
ip_addr_t *old_gw = NULL;
#endif
LWIP_ASSERT_CORE_LOCKED();
/* Don't propagate NULL pointer (IPv4 ANY) to subsequent functions */
@ -588,7 +604,13 @@ netif_set_gw(struct netif *netif, const ip4_addr_t *gw)
gw = IP4_ADDR_ANY4;
}
netif_do_set_gw(netif, gw, 1);
if (netif_do_set_gw(netif, gw, old_gw)) {
#if LWIP_NETIF_EXT_STATUS_CALLBACK
netif_ext_callback_args_t args;
args.ipv4_changed.old_gw = old_gw;
netif_invoke_ext_callback(netif, LWIP_NSC_IPV4_GATEWAY_CHANGED, &args);
#endif
}
}
/**
@ -606,8 +628,18 @@ netif_set_addr(struct netif *netif, const ip4_addr_t *ipaddr, const ip4_addr_t *
const ip4_addr_t *gw)
{
#if LWIP_NETIF_EXT_STATUS_CALLBACK
u8_t something_changed = 0;
netif_nsc_reason_t change_reason = LWIP_NSC_NONE;
netif_ext_callback_args_t cb_args;
ip_addr_t old_nm_val;
ip_addr_t old_gw_val;
ip_addr_t *old_nm = &old_nm_val;
ip_addr_t *old_gw = &old_gw_val;
#else
ip_addr_t *old_nm = NULL;
ip_addr_t *old_gw = NULL;
#endif
ip_addr_t old_addr;
int remove;
LWIP_ASSERT_CORE_LOCKED();
@ -622,30 +654,43 @@ netif_set_addr(struct netif *netif, const ip4_addr_t *ipaddr, const ip4_addr_t *
gw = IP4_ADDR_ANY4;
}
#if LWIP_NETIF_EXT_STATUS_CALLBACK
if ((ip4_addr_cmp(ipaddr, netif_ip4_addr(netif)) == 0) ||
(ip4_addr_cmp(gw, netif_ip4_gw(netif)) == 0) ||
(ip4_addr_cmp(netmask, netif_ip4_netmask(netif)) == 0)) {
something_changed = 1;
}
#endif
if (ip4_addr_isany(ipaddr)) {
remove = ip4_addr_isany(ipaddr);
if (remove) {
/* when removing an address, we have to remove it *before* changing netmask/gw
to ensure that tcp RST segment can be sent correctly */
netif_do_set_ipaddr(netif, ipaddr, 0);
netif_do_set_netmask(netif, netmask, 0);
netif_do_set_gw(netif, gw, 0);
} else {
if (netif_do_set_ipaddr(netif, ipaddr, &old_addr)) {
#if LWIP_NETIF_EXT_STATUS_CALLBACK
change_reason |= LWIP_NSC_IPV4_ADDRESS_CHANGED;
cb_args.ipv4_changed.old_address = &old_addr;
#endif
}
}
if (netif_do_set_netmask(netif, netmask, old_nm)) {
#if LWIP_NETIF_EXT_STATUS_CALLBACK
change_reason |= LWIP_NSC_IPV4_NETMASK_CHANGED;
cb_args.ipv4_changed.old_netmask = old_nm;
#endif
}
if (netif_do_set_gw(netif, gw, old_gw)) {
#if LWIP_NETIF_EXT_STATUS_CALLBACK
change_reason |= LWIP_NSC_IPV4_GATEWAY_CHANGED;
cb_args.ipv4_changed.old_gw = old_gw;
#endif
}
if (!remove) {
/* set ipaddr last to ensure netmask/gw have been set when status callback is called */
netif_do_set_netmask(netif, netmask, 0);
netif_do_set_gw(netif, gw, 0);
netif_do_set_ipaddr(netif, ipaddr, 0);
if (netif_do_set_ipaddr(netif, ipaddr, &old_addr)) {
#if LWIP_NETIF_EXT_STATUS_CALLBACK
change_reason |= LWIP_NSC_IPV4_ADDRESS_CHANGED;
cb_args.ipv4_changed.old_address = &old_addr;
#endif
}
}
#if LWIP_NETIF_EXT_STATUS_CALLBACK
if (something_changed != 0) {
netif_invoke_ext_callback(netif, LWIP_NSC_IPV4_SETTINGS_CHANGED, NULL);
if (change_reason != LWIP_NSC_NONE) {
change_reason |= LWIP_NSC_IPV4_SETTINGS_CHANGED;
netif_invoke_ext_callback(netif, change_reason, &cb_args);
}
#endif
}

16
src/include/lwip/netif.h
View File

@ -577,24 +577,14 @@ typedef union
/** 1: up; 0: down */
u8_t state;
} status_changed;
/** Args to LWIP_NSC_IPV4_ADDRESS_CHANGED callback */
/** Args to LWIP_NSC_IPV4_ADDRESS_CHANGED|LWIP_NSC_IPV4_GATEWAY_CHANGED|LWIP_NSC_IPV4_NETMASK_CHANGED|LWIP_NSC_IPV4_SETTINGS_CHANGED callback */
struct ipv4_changed_s
{
/** Old IPv4 address */
const ip_addr_t* old_address;
const ip_addr_t* old_netmask;
const ip_addr_t* old_gw;
} ipv4_changed;
/** Args to LWIP_NSC_IPV4_GATEWAY_CHANGED callback */
struct ipv4_gw_changed_s
{
/** Old IPv4 gateway */
const ip_addr_t* old_address;
} ipv4_gw_changed;
/** Args to LWIP_NSC_IPV4_NETMASK_CHANGED callback */
struct ipv4_nm_changed_s
{
/** Old IPv4 netmask */
const ip_addr_t* old_address;
} ipv4_nm_changed;
/** Args to LWIP_NSC_IPV6_SET callback */
struct ipv6_set_s
{

111
test/unit/core/test_netif.c
View File

@ -58,10 +58,7 @@ testif_init(struct netif *netif)
}
#define MAX_NSC_REASON_IDX 10
static int ext_cb_counters[MAX_NSC_REASON_IDX];
static netif_nsc_reason_t reasons;
static netif_ext_callback_args_t *expected_args;
static netif_nsc_reason_t expected_reasons;
static int dummy_active;
@ -78,46 +75,11 @@ test_netif_ext_callback_dummy(struct netif* netif, netif_nsc_reason_t reason, co
static void
test_netif_ext_callback(struct netif* netif, netif_nsc_reason_t reason, const netif_ext_callback_args_t* args)
{
int i;
u32_t reason_flags = (u32_t)reason;
u32_t mask;
reasons = reasons | reason;
LWIP_UNUSED_ARG(args); /* @todo */
fail_unless(netif == &net_test);
fail_unless(reason != 0);
fail_unless((((u32_t)reason) & ~((1U << MAX_NSC_REASON_IDX) - 1U)) == 0);
LWIP_UNUSED_ARG(args);
for (i = 0, mask = 1U; i < MAX_NSC_REASON_IDX; i++, mask <<= 1) {
if (reason_flags & mask) {
ext_cb_counters[i]++;
}
}
if (expected_args != NULL) {
fail_unless(memcmp(expected_args, args, sizeof(netif_ext_callback_args_t)) == 0);
}
}
static void
test_netif_ext_callback_assert_flag_count(netif_nsc_reason_t reason, int expected_count)
{
int i;
u32_t reason_flags = (u32_t)reason;
u32_t mask;
for (i = 0, mask = 1U; i < MAX_NSC_REASON_IDX; i++, mask <<= 1) {
if (reason_flags & mask) {
fail_unless(ext_cb_counters[i] == expected_count);
}
}
}
static void
test_netif_ext_callback_reset(void)
{
memset(ext_cb_counters, 0, sizeof(ext_cb_counters));
reasons = 0;
fail_unless(expected_reasons == reason);
}
/* Test functions */
@ -143,32 +105,63 @@ START_TEST(test_netif_extcallbacks)
dummy_active = 1;
reasons = 0;
netif_add(&net_test, &addr, &netmask, &gw, &net_test, testif_init, ethernet_input);
fail_unless(reasons == LWIP_NSC_NETIF_ADDED);
test_netif_ext_callback_assert_flag_count(LWIP_NSC_NETIF_ADDED, 1);
test_netif_ext_callback_reset();
/* positive tests: check that single events come as expected */
expected_reasons = LWIP_NSC_NETIF_ADDED;
netif_add(&net_test, &addr, &netmask, &gw, &net_test, testif_init, ethernet_input);
expected_reasons = LWIP_NSC_LINK_CHANGED;
netif_set_link_up(&net_test);
fail_unless(reasons == LWIP_NSC_LINK_CHANGED);
test_netif_ext_callback_assert_flag_count(LWIP_NSC_LINK_CHANGED, 1);
test_netif_ext_callback_reset();
expected_reasons = LWIP_NSC_STATUS_CHANGED;
netif_set_up(&net_test);
fail_unless(reasons == LWIP_NSC_STATUS_CHANGED);
test_netif_ext_callback_assert_flag_count(LWIP_NSC_STATUS_CHANGED, 1);
test_netif_ext_callback_reset();
IP4_ADDR(&addr, 1, 2, 3, 4);
expected_reasons = LWIP_NSC_IPV4_ADDRESS_CHANGED;
netif_set_ipaddr(&net_test, &addr);
fail_unless(reasons == LWIP_NSC_IPV4_ADDRESS_CHANGED);
test_netif_ext_callback_assert_flag_count(LWIP_NSC_IPV4_ADDRESS_CHANGED, 1);
test_netif_ext_callback_reset();
IP4_ADDR(&netmask, 255, 255, 255, 0);
expected_reasons = LWIP_NSC_IPV4_NETMASK_CHANGED;
netif_set_netmask(&net_test, &netmask);
IP4_ADDR(&gw, 1, 2, 3, 254);
expected_reasons = LWIP_NSC_IPV4_GATEWAY_CHANGED;
netif_set_gw(&net_test, &gw);
IP4_ADDR(&addr, 0, 0, 0, 0);
expected_reasons = LWIP_NSC_IPV4_ADDRESS_CHANGED;
netif_set_ipaddr(&net_test, &addr);
IP4_ADDR(&netmask, 0, 0, 0, 0);
expected_reasons = LWIP_NSC_IPV4_NETMASK_CHANGED;
netif_set_netmask(&net_test, &netmask);
IP4_ADDR(&gw, 0, 0, 0, 0);
expected_reasons = LWIP_NSC_IPV4_GATEWAY_CHANGED;
netif_set_gw(&net_test, &gw);
/* check that for multi-events (only one combined callback expected) */
IP4_ADDR(&addr, 1, 2, 3, 4);
IP4_ADDR(&netmask, 255, 255, 255, 0);
IP4_ADDR(&gw, 1, 2, 3, 254);
expected_reasons = LWIP_NSC_IPV4_ADDRESS_CHANGED | LWIP_NSC_IPV4_NETMASK_CHANGED | LWIP_NSC_IPV4_GATEWAY_CHANGED | LWIP_NSC_IPV4_SETTINGS_CHANGED;
netif_set_addr(&net_test, &addr, &netmask, &gw);
/* check that for no-change, no callback is expected */
expected_reasons = 0;
netif_set_ipaddr(&net_test, &addr);
netif_set_netmask(&net_test, &netmask);
netif_set_gw(&net_test, &gw);
netif_set_addr(&net_test, &addr, &netmask, &gw);
expected_reasons = LWIP_NSC_STATUS_CHANGED;
netif_set_down(&net_test);
expected_reasons = LWIP_NSC_NETIF_REMOVED;
netif_remove(&net_test);
fail_unless(reasons == (LWIP_NSC_NETIF_REMOVED | LWIP_NSC_STATUS_CHANGED));
test_netif_ext_callback_assert_flag_count(LWIP_NSC_NETIF_REMOVED, 1);
test_netif_ext_callback_assert_flag_count(LWIP_NSC_STATUS_CHANGED, 1);
test_netif_ext_callback_reset();
expected_reasons = 0;
netif_remove_ext_callback(&netif_callback_2);
netif_remove_ext_callback(&netif_callback_3);