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Merge pull request #3758 from cesanta/4861

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be more RFC4861 6.1.2 friendly
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Sergio R. Caprile authored and GitHub committed 2026-11-06 09:47:15 -03:00
2 parents e8bb01b547 66eb0384be
commit 28f88f016c
2 files changed
+14 -12
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mongoose.c
+7 -6
View File
@@ -9922,6 +9922,7 @@ static const struct mg_addr ip6_allrouters = {
{{0xFF, 0x02, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x02}}, 0, 0, true};
static const struct mg_addr ip6_allnodes = {
{{0xFF, 0x02, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x01}}, 0, 0, true};
static const uint8_t locpx[8] = {0xfe, 0x80, 0, 0, 0, 0, 0, 0};
#define MG_IP6MATCH(a, b) (a[0] == b[0] && a[1] == b[1])
#endif
@@ -10573,12 +10574,13 @@ static void rx_ndp_ra(struct mg_tcpip_if *ifp, struct pkt *pkt) {
if (pkt->pay.len < sizeof(*ra)) return;
if (ifp->state6 == MG_TCPIP_STATE_UP) {
MG_DEBUG(("Received NDP RA")); // fill gw6 address
MG_DEBUG(("Received NDP RA")); // fill gw6 address if RFC 4861 6.1.2
if (memcmp(pkt->ip6->src, locpx, 8) != 0 || pkt->ip6->hops != 255) return;
// parse options
while (opt_left >= 2) {
uint8_t type = opts[0], len = opts[1];
size_t length = (size_t) len * 8;
if (length == 0 || length > opt_left) break; // malformed
if (length == 0 || length > opt_left) return; // RFC 4861 6.1.2
if (type == 1 && length >= 8) {
// Received router's L2 address
if (!mg_l2_ip6get(ifp->l2type, l2, opts + 2, len)) break;
@@ -10659,7 +10661,7 @@ static void rx_icmp6(struct mg_tcpip_if *ifp, struct pkt *pkt) {
}
} break;
case 134: // Router Advertisement
rx_ndp_ra(ifp, pkt);
if (pkt->icmp6->code == 0) rx_ndp_ra(ifp, pkt); // RFC 4861 6.1.2
break;
case 135: // Neighbor Solicitation
rx_ndp_ns(ifp, pkt);
@@ -11644,12 +11646,11 @@ static void mg_ip6_poll(struct mg_tcpip_if *ifp, bool s1) {
static void mg_ip6_link(struct mg_tcpip_if *ifp, bool drv_up, bool l2_up) {
bool cur_drv = (ifp->state6 != MG_TCPIP_STATE_DOWN);
bool cur_l2 = (ifp->state6 >= MG_TCPIP_STATE_UP);
const uint8_t px[8] = {0xfe, 0x80, 0, 0, 0, 0, 0, 0}; // RFC-4291 2.5.6
if (drv_up != cur_drv || l2_up != cur_l2) { // link/L2 state has changed
if (ifp->l2type == MG_TCPIP_L2_ETH && l2_up && ifp->ip6ll[0] == 0 &&
ifp->ip6ll[1] == 0) { // gen ll address
mg_l2_genip6(ifp->l2type, ifp->ip6ll, 64, ifp->mac);
memcpy(ifp->ip6ll, px, 8); // RFC-2464 5
memcpy(ifp->ip6ll, locpx, 8); // RFC-4291 2.5.6; RFC-2464 5
} // just got our link local address if we didn't have one.
// If static configuration is used, global addresses,
// prefix length, and gw are already filled at this point.
@@ -11669,7 +11670,7 @@ static void mg_ip6_link(struct mg_tcpip_if *ifp, bool drv_up, bool l2_up) {
if ((ifp->l2type == MG_TCPIP_L2_PPP || ifp->l2type == MG_TCPIP_L2_PPPoE) &&
ifp->state6 == MG_TCPIP_STATE_UP && ifp->ip6ll[0] == 0 &&
ifp->ip6ll[1] != 0) { // IPV6CP has got an IFCID, gen ll address
memcpy(ifp->ip6ll, px, 8); // RFC-5072 5
memcpy(ifp->ip6ll, locpx, 8); // RFC-5072 5
onstate6change(ifp);
} // just got our link local address if we didn't have one.
}
src/net_builtin.c
+7 -6
View File
@@ -370,6 +370,7 @@ static const struct mg_addr ip6_allrouters = {
{{0xFF, 0x02, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x02}}, 0, 0, true};
static const struct mg_addr ip6_allnodes = {
{{0xFF, 0x02, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x01}}, 0, 0, true};
static const uint8_t locpx[8] = {0xfe, 0x80, 0, 0, 0, 0, 0, 0};
#define MG_IP6MATCH(a, b) (a[0] == b[0] && a[1] == b[1])
#endif
@@ -1021,12 +1022,13 @@ static void rx_ndp_ra(struct mg_tcpip_if *ifp, struct pkt *pkt) {
if (pkt->pay.len < sizeof(*ra)) return;
if (ifp->state6 == MG_TCPIP_STATE_UP) {
MG_DEBUG(("Received NDP RA")); // fill gw6 address
MG_DEBUG(("Received NDP RA")); // fill gw6 address if RFC 4861 6.1.2
if (memcmp(pkt->ip6->src, locpx, 8) != 0 || pkt->ip6->hops != 255) return;
// parse options
while (opt_left >= 2) {
uint8_t type = opts[0], len = opts[1];
size_t length = (size_t) len * 8;
if (length == 0 || length > opt_left) break; // malformed
if (length == 0 || length > opt_left) return; // RFC 4861 6.1.2
if (type == 1 && length >= 8) {
// Received router's L2 address
if (!mg_l2_ip6get(ifp->l2type, l2, opts + 2, len)) break;
@@ -1107,7 +1109,7 @@ static void rx_icmp6(struct mg_tcpip_if *ifp, struct pkt *pkt) {
}
} break;
case 134: // Router Advertisement
rx_ndp_ra(ifp, pkt);
if (pkt->icmp6->code == 0) rx_ndp_ra(ifp, pkt); // RFC 4861 6.1.2
break;
case 135: // Neighbor Solicitation
rx_ndp_ns(ifp, pkt);
@@ -2092,12 +2094,11 @@ static void mg_ip6_poll(struct mg_tcpip_if *ifp, bool s1) {
static void mg_ip6_link(struct mg_tcpip_if *ifp, bool drv_up, bool l2_up) {
bool cur_drv = (ifp->state6 != MG_TCPIP_STATE_DOWN);
bool cur_l2 = (ifp->state6 >= MG_TCPIP_STATE_UP);
const uint8_t px[8] = {0xfe, 0x80, 0, 0, 0, 0, 0, 0}; // RFC-4291 2.5.6
if (drv_up != cur_drv || l2_up != cur_l2) { // link/L2 state has changed
if (ifp->l2type == MG_TCPIP_L2_ETH && l2_up && ifp->ip6ll[0] == 0 &&
ifp->ip6ll[1] == 0) { // gen ll address
mg_l2_genip6(ifp->l2type, ifp->ip6ll, 64, ifp->mac);
memcpy(ifp->ip6ll, px, 8); // RFC-2464 5
memcpy(ifp->ip6ll, locpx, 8); // RFC-4291 2.5.6; RFC-2464 5
} // just got our link local address if we didn't have one.
// If static configuration is used, global addresses,
// prefix length, and gw are already filled at this point.
@@ -2117,7 +2118,7 @@ static void mg_ip6_link(struct mg_tcpip_if *ifp, bool drv_up, bool l2_up) {
if ((ifp->l2type == MG_TCPIP_L2_PPP || ifp->l2type == MG_TCPIP_L2_PPPoE) &&
ifp->state6 == MG_TCPIP_STATE_UP && ifp->ip6ll[0] == 0 &&
ifp->ip6ll[1] != 0) { // IPV6CP has got an IFCID, gen ll address
memcpy(ifp->ip6ll, px, 8); // RFC-5072 5
memcpy(ifp->ip6ll, locpx, 8); // RFC-5072 5
onstate6change(ifp);
} // just got our link local address if we didn't have one.
}