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Merge pull request #426 from DrDoof/fix/igmp-port-shift

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igmp: mask the port number before shifting by it
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René van Dorst authored and GitHub committed 2026-09-11 20:22:34 +00:00
2 parents dc82e044bc 624f93a28a
commit dad65fd550
1 file changed
+2 -2
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rtl837x_igmp.c
+2 -2
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@@ -295,7 +295,7 @@ void igmp_packet_handler(void) __banked
entry.pmask |= ((uint16_t)sfr_data[3]) << 2; entry.pmask |= ((uint16_t)sfr_data[3]) << 2;
} }
// Update (found) entry with portmask from trapped Packet // Update (found) entry with portmask from trapped Packet
entry.pmask |= (1L << (IGMP_I->rtl_tag.pmask >> 8)); // Swap bytes from network order, only 4 LSB count entry.pmask |= ((uint16_t)1) << ((IGMP_I->rtl_tag.pmask >> 8) & 0x0f); // Swap bytes from network order, only 4 LSB count
// print_string("\nPort-Mask: "); print_short(entry.pmask); write_char('\n'); // print_string("\nPort-Mask: "); print_short(entry.pmask); write_char('\n');
} else if (IGMP_I->igmp_rtype == 0x3){ // Leave group } else if (IGMP_I->igmp_rtype == 0x3){ // Leave group
if (sfr_data[2] & 0x10) { if (sfr_data[2] & 0x10) {
@@ -312,7 +312,7 @@ void igmp_packet_handler(void) __banked
write_char('\n'); write_char('\n');
#endif #endif
// Remove portmask of IGMP packet from entry // Remove portmask of IGMP packet from entry
entry.pmask &= ~(1L << (IGMP_I->rtl_tag.pmask >> 8)); // Swap bytes from network order, only 4 LSB count entry.pmask &= ~(((uint16_t)1) << ((IGMP_I->rtl_tag.pmask >> 8) & 0x0f)); // Swap bytes from network order, only 4 LSB count
// print_string("\nPort-Mask: "); print_short(entry.pmask); write_char('\n'); // print_string("\nPort-Mask: "); print_short(entry.pmask); write_char('\n');
} else { } else {
print_string("IGMP Entry already deleted\n"); print_string("IGMP Entry already deleted\n");