Linux Audio

Check our new training course

Embedded Linux Audio

Check our new training course
with Creative Commons CC-BY-SA
lecture materials

Bootlin logo

Elixir Cross Referencer

Loading...
   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
/*
 *	Linux NET3:	Internet Group Management Protocol  [IGMP]
 *
 *	This code implements the IGMP protocol as defined in RFC1112. There has
 *	been a further revision of this protocol since which is now supported.
 *
 *	If you have trouble with this module be careful what gcc you have used,
 *	the older version didn't come out right using gcc 2.5.8, the newer one
 *	seems to fall out with gcc 2.6.2.
 *
 *	Authors:
 *		Alan Cox <alan@lxorguk.ukuu.org.uk>
 *
 *	This program is free software; you can redistribute it and/or
 *	modify it under the terms of the GNU General Public License
 *	as published by the Free Software Foundation; either version
 *	2 of the License, or (at your option) any later version.
 *
 *	Fixes:
 *
 *		Alan Cox	:	Added lots of __inline__ to optimise
 *					the memory usage of all the tiny little
 *					functions.
 *		Alan Cox	:	Dumped the header building experiment.
 *		Alan Cox	:	Minor tweaks ready for multicast routing
 *					and extended IGMP protocol.
 *		Alan Cox	:	Removed a load of inline directives. Gcc 2.5.8
 *					writes utterly bogus code otherwise (sigh)
 *					fixed IGMP loopback to behave in the manner
 *					desired by mrouted, fixed the fact it has been
 *					broken since 1.3.6 and cleaned up a few minor
 *					points.
 *
 *		Chih-Jen Chang	:	Tried to revise IGMP to Version 2
 *		Tsu-Sheng Tsao		E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu
 *					The enhancements are mainly based on Steve Deering's
 * 					ipmulti-3.5 source code.
 *		Chih-Jen Chang	:	Added the igmp_get_mrouter_info and
 *		Tsu-Sheng Tsao		igmp_set_mrouter_info to keep track of
 *					the mrouted version on that device.
 *		Chih-Jen Chang	:	Added the max_resp_time parameter to
 *		Tsu-Sheng Tsao		igmp_heard_query(). Using this parameter
 *					to identify the multicast router version
 *					and do what the IGMP version 2 specified.
 *		Chih-Jen Chang	:	Added a timer to revert to IGMP V2 router
 *		Tsu-Sheng Tsao		if the specified time expired.
 *		Alan Cox	:	Stop IGMP from 0.0.0.0 being accepted.
 *		Alan Cox	:	Use GFP_ATOMIC in the right places.
 *		Christian Daudt :	igmp timer wasn't set for local group
 *					memberships but was being deleted,
 *					which caused a "del_timer() called
 *					from %p with timer not initialized\n"
 *					message (960131).
 *		Christian Daudt :	removed del_timer from
 *					igmp_timer_expire function (960205).
 *             Christian Daudt :       igmp_heard_report now only calls
 *                                     igmp_timer_expire if tm->running is
 *                                     true (960216).
 *		Malcolm Beattie :	ttl comparison wrong in igmp_rcv made
 *					igmp_heard_query never trigger. Expiry
 *					miscalculation fixed in igmp_heard_query
 *					and random() made to return unsigned to
 *					prevent negative expiry times.
 *		Alexey Kuznetsov:	Wrong group leaving behaviour, backport
 *					fix from pending 2.1.x patches.
 *		Alan Cox:		Forget to enable FDDI support earlier.
 *		Alexey Kuznetsov:	Fixed leaving groups on device down.
 *		Alexey Kuznetsov:	Accordance to igmp-v2-06 draft.
 *		David L Stevens:	IGMPv3 support, with help from
 *					Vinay Kulkarni
 */

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/jiffies.h>
#include <linux/string.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/in.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/inetdevice.h>
#include <linux/igmp.h>
#include <linux/if_arp.h>
#include <linux/rtnetlink.h>
#include <linux/times.h>
#include <linux/pkt_sched.h>
#include <linux/byteorder/generic.h>

#include <net/net_namespace.h>
#include <net/arp.h>
#include <net/ip.h>
#include <net/protocol.h>
#include <net/route.h>
#include <net/sock.h>
#include <net/checksum.h>
#include <net/inet_common.h>
#include <linux/netfilter_ipv4.h>
#ifdef CONFIG_IP_MROUTE
#include <linux/mroute.h>
#endif
#ifdef CONFIG_PROC_FS
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#endif

#ifdef CONFIG_IP_MULTICAST
/* Parameter names and values are taken from igmp-v2-06 draft */

#define IGMP_V1_ROUTER_PRESENT_TIMEOUT		(400*HZ)
#define IGMP_V2_ROUTER_PRESENT_TIMEOUT		(400*HZ)
#define IGMP_V2_UNSOLICITED_REPORT_INTERVAL	(10*HZ)
#define IGMP_V3_UNSOLICITED_REPORT_INTERVAL	(1*HZ)
#define IGMP_QUERY_RESPONSE_INTERVAL		(10*HZ)
#define IGMP_QUERY_ROBUSTNESS_VARIABLE		2


#define IGMP_INITIAL_REPORT_DELAY		(1)

/* IGMP_INITIAL_REPORT_DELAY is not from IGMP specs!
 * IGMP specs require to report membership immediately after
 * joining a group, but we delay the first report by a
 * small interval. It seems more natural and still does not
 * contradict to specs provided this delay is small enough.
 */

#define IGMP_V1_SEEN(in_dev) \
	(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
	 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
	 ((in_dev)->mr_v1_seen && \
	  time_before(jiffies, (in_dev)->mr_v1_seen)))
#define IGMP_V2_SEEN(in_dev) \
	(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
	 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
	 ((in_dev)->mr_v2_seen && \
	  time_before(jiffies, (in_dev)->mr_v2_seen)))

static int unsolicited_report_interval(struct in_device *in_dev)
{
	int interval_ms, interval_jiffies;

	if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
		interval_ms = IN_DEV_CONF_GET(
			in_dev,
			IGMPV2_UNSOLICITED_REPORT_INTERVAL);
	else /* v3 */
		interval_ms = IN_DEV_CONF_GET(
			in_dev,
			IGMPV3_UNSOLICITED_REPORT_INTERVAL);

	interval_jiffies = msecs_to_jiffies(interval_ms);

	/* _timer functions can't handle a delay of 0 jiffies so ensure
	 *  we always return a positive value.
	 */
	if (interval_jiffies <= 0)
		interval_jiffies = 1;
	return interval_jiffies;
}

static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im);
static void igmpv3_clear_delrec(struct in_device *in_dev);
static int sf_setstate(struct ip_mc_list *pmc);
static void sf_markstate(struct ip_mc_list *pmc);
#endif
static void ip_mc_clear_src(struct ip_mc_list *pmc);
static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
			 int sfcount, __be32 *psfsrc, int delta);

static void ip_ma_put(struct ip_mc_list *im)
{
	if (refcount_dec_and_test(&im->refcnt)) {
		in_dev_put(im->interface);
		kfree_rcu(im, rcu);
	}
}

#define for_each_pmc_rcu(in_dev, pmc)				\
	for (pmc = rcu_dereference(in_dev->mc_list);		\
	     pmc != NULL;					\
	     pmc = rcu_dereference(pmc->next_rcu))

#define for_each_pmc_rtnl(in_dev, pmc)				\
	for (pmc = rtnl_dereference(in_dev->mc_list);		\
	     pmc != NULL;					\
	     pmc = rtnl_dereference(pmc->next_rcu))

#ifdef CONFIG_IP_MULTICAST

/*
 *	Timer management
 */

static void igmp_stop_timer(struct ip_mc_list *im)
{
	spin_lock_bh(&im->lock);
	if (del_timer(&im->timer))
		refcount_dec(&im->refcnt);
	im->tm_running = 0;
	im->reporter = 0;
	im->unsolicit_count = 0;
	spin_unlock_bh(&im->lock);
}

/* It must be called with locked im->lock */
static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
{
	int tv = prandom_u32() % max_delay;

	im->tm_running = 1;
	if (!mod_timer(&im->timer, jiffies+tv+2))
		refcount_inc(&im->refcnt);
}

static void igmp_gq_start_timer(struct in_device *in_dev)
{
	int tv = prandom_u32() % in_dev->mr_maxdelay;
	unsigned long exp = jiffies + tv + 2;

	if (in_dev->mr_gq_running &&
	    time_after_eq(exp, (in_dev->mr_gq_timer).expires))
		return;

	in_dev->mr_gq_running = 1;
	if (!mod_timer(&in_dev->mr_gq_timer, exp))
		in_dev_hold(in_dev);
}

static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
{
	int tv = prandom_u32() % delay;

	if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
		in_dev_hold(in_dev);
}

static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
{
	spin_lock_bh(&im->lock);
	im->unsolicit_count = 0;
	if (del_timer(&im->timer)) {
		if ((long)(im->timer.expires-jiffies) < max_delay) {
			add_timer(&im->timer);
			im->tm_running = 1;
			spin_unlock_bh(&im->lock);
			return;
		}
		refcount_dec(&im->refcnt);
	}
	igmp_start_timer(im, max_delay);
	spin_unlock_bh(&im->lock);
}


/*
 *	Send an IGMP report.
 */

#define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)


static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
	int gdeleted, int sdeleted)
{
	switch (type) {
	case IGMPV3_MODE_IS_INCLUDE:
	case IGMPV3_MODE_IS_EXCLUDE:
		if (gdeleted || sdeleted)
			return 0;
		if (!(pmc->gsquery && !psf->sf_gsresp)) {
			if (pmc->sfmode == MCAST_INCLUDE)
				return 1;
			/* don't include if this source is excluded
			 * in all filters
			 */
			if (psf->sf_count[MCAST_INCLUDE])
				return type == IGMPV3_MODE_IS_INCLUDE;
			return pmc->sfcount[MCAST_EXCLUDE] ==
				psf->sf_count[MCAST_EXCLUDE];
		}
		return 0;
	case IGMPV3_CHANGE_TO_INCLUDE:
		if (gdeleted || sdeleted)
			return 0;
		return psf->sf_count[MCAST_INCLUDE] != 0;
	case IGMPV3_CHANGE_TO_EXCLUDE:
		if (gdeleted || sdeleted)
			return 0;
		if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
		    psf->sf_count[MCAST_INCLUDE])
			return 0;
		return pmc->sfcount[MCAST_EXCLUDE] ==
			psf->sf_count[MCAST_EXCLUDE];
	case IGMPV3_ALLOW_NEW_SOURCES:
		if (gdeleted || !psf->sf_crcount)
			return 0;
		return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
	case IGMPV3_BLOCK_OLD_SOURCES:
		if (pmc->sfmode == MCAST_INCLUDE)
			return gdeleted || (psf->sf_crcount && sdeleted);
		return psf->sf_crcount && !gdeleted && !sdeleted;
	}
	return 0;
}

static int
igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
{
	struct ip_sf_list *psf;
	int scount = 0;

	for (psf = pmc->sources; psf; psf = psf->sf_next) {
		if (!is_in(pmc, psf, type, gdeleted, sdeleted))
			continue;
		scount++;
	}
	return scount;
}

/* source address selection per RFC 3376 section 4.2.13 */
static __be32 igmpv3_get_srcaddr(struct net_device *dev,
				 const struct flowi4 *fl4)
{
	struct in_device *in_dev = __in_dev_get_rcu(dev);

	if (!in_dev)
		return htonl(INADDR_ANY);

	for_ifa(in_dev) {
		if (fl4->saddr == ifa->ifa_local)
			return fl4->saddr;
	} endfor_ifa(in_dev);

	return htonl(INADDR_ANY);
}

static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu)
{
	struct sk_buff *skb;
	struct rtable *rt;
	struct iphdr *pip;
	struct igmpv3_report *pig;
	struct net *net = dev_net(dev);
	struct flowi4 fl4;
	int hlen = LL_RESERVED_SPACE(dev);
	int tlen = dev->needed_tailroom;
	unsigned int size = mtu;

	while (1) {
		skb = alloc_skb(size + hlen + tlen,
				GFP_ATOMIC | __GFP_NOWARN);
		if (skb)
			break;
		size >>= 1;
		if (size < 256)
			return NULL;
	}
	skb->priority = TC_PRIO_CONTROL;

	rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
				   0, 0,
				   IPPROTO_IGMP, 0, dev->ifindex);
	if (IS_ERR(rt)) {
		kfree_skb(skb);
		return NULL;
	}

	skb_dst_set(skb, &rt->dst);
	skb->dev = dev;

	skb_reserve(skb, hlen);
	skb_tailroom_reserve(skb, mtu, tlen);

	skb_reset_network_header(skb);
	pip = ip_hdr(skb);
	skb_put(skb, sizeof(struct iphdr) + 4);

	pip->version  = 4;
	pip->ihl      = (sizeof(struct iphdr)+4)>>2;
	pip->tos      = 0xc0;
	pip->frag_off = htons(IP_DF);
	pip->ttl      = 1;
	pip->daddr    = fl4.daddr;

	rcu_read_lock();
	pip->saddr    = igmpv3_get_srcaddr(dev, &fl4);
	rcu_read_unlock();

	pip->protocol = IPPROTO_IGMP;
	pip->tot_len  = 0;	/* filled in later */
	ip_select_ident(net, skb, NULL);
	((u8 *)&pip[1])[0] = IPOPT_RA;
	((u8 *)&pip[1])[1] = 4;
	((u8 *)&pip[1])[2] = 0;
	((u8 *)&pip[1])[3] = 0;

	skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
	skb_put(skb, sizeof(*pig));
	pig = igmpv3_report_hdr(skb);
	pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
	pig->resv1 = 0;
	pig->csum = 0;
	pig->resv2 = 0;
	pig->ngrec = 0;
	return skb;
}

static int igmpv3_sendpack(struct sk_buff *skb)
{
	struct igmphdr *pig = igmp_hdr(skb);
	const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb);

	pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);

	return ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
}

static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
{
	return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
}

static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
	int type, struct igmpv3_grec **ppgr, unsigned int mtu)
{
	struct net_device *dev = pmc->interface->dev;
	struct igmpv3_report *pih;
	struct igmpv3_grec *pgr;

	if (!skb) {
		skb = igmpv3_newpack(dev, mtu);
		if (!skb)
			return NULL;
	}
	pgr = skb_put(skb, sizeof(struct igmpv3_grec));
	pgr->grec_type = type;
	pgr->grec_auxwords = 0;
	pgr->grec_nsrcs = 0;
	pgr->grec_mca = pmc->multiaddr;
	pih = igmpv3_report_hdr(skb);
	pih->ngrec = htons(ntohs(pih->ngrec)+1);
	*ppgr = pgr;
	return skb;
}

#define AVAILABLE(skb)	((skb) ? skb_availroom(skb) : 0)

static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
	int type, int gdeleted, int sdeleted)
{
	struct net_device *dev = pmc->interface->dev;
	struct net *net = dev_net(dev);
	struct igmpv3_report *pih;
	struct igmpv3_grec *pgr = NULL;
	struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
	int scount, stotal, first, isquery, truncate;
	unsigned int mtu;

	if (pmc->multiaddr == IGMP_ALL_HOSTS)
		return skb;
	if (ipv4_is_local_multicast(pmc->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports)
		return skb;

	mtu = READ_ONCE(dev->mtu);
	if (mtu < IPV4_MIN_MTU)
		return skb;

	isquery = type == IGMPV3_MODE_IS_INCLUDE ||
		  type == IGMPV3_MODE_IS_EXCLUDE;
	truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
		    type == IGMPV3_CHANGE_TO_EXCLUDE;

	stotal = scount = 0;

	psf_list = sdeleted ? &pmc->tomb : &pmc->sources;

	if (!*psf_list)
		goto empty_source;

	pih = skb ? igmpv3_report_hdr(skb) : NULL;

	/* EX and TO_EX get a fresh packet, if needed */
	if (truncate) {
		if (pih && pih->ngrec &&
		    AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
			if (skb)
				igmpv3_sendpack(skb);
			skb = igmpv3_newpack(dev, mtu);
		}
	}
	first = 1;
	psf_prev = NULL;
	for (psf = *psf_list; psf; psf = psf_next) {
		__be32 *psrc;

		psf_next = psf->sf_next;

		if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
			psf_prev = psf;
			continue;
		}

		/* Based on RFC3376 5.1. Should not send source-list change
		 * records when there is a filter mode change.
		 */
		if (((gdeleted && pmc->sfmode == MCAST_EXCLUDE) ||
		     (!gdeleted && pmc->crcount)) &&
		    (type == IGMPV3_ALLOW_NEW_SOURCES ||
		     type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount)
			goto decrease_sf_crcount;

		/* clear marks on query responses */
		if (isquery)
			psf->sf_gsresp = 0;

		if (AVAILABLE(skb) < sizeof(__be32) +
		    first*sizeof(struct igmpv3_grec)) {
			if (truncate && !first)
				break;	 /* truncate these */
			if (pgr)
				pgr->grec_nsrcs = htons(scount);
			if (skb)
				igmpv3_sendpack(skb);
			skb = igmpv3_newpack(dev, mtu);
			first = 1;
			scount = 0;
		}
		if (first) {
			skb = add_grhead(skb, pmc, type, &pgr, mtu);
			first = 0;
		}
		if (!skb)
			return NULL;
		psrc = skb_put(skb, sizeof(__be32));
		*psrc = psf->sf_inaddr;
		scount++; stotal++;
		if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
		     type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
decrease_sf_crcount:
			psf->sf_crcount--;
			if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
				if (psf_prev)
					psf_prev->sf_next = psf->sf_next;
				else
					*psf_list = psf->sf_next;
				kfree(psf);
				continue;
			}
		}
		psf_prev = psf;
	}

empty_source:
	if (!stotal) {
		if (type == IGMPV3_ALLOW_NEW_SOURCES ||
		    type == IGMPV3_BLOCK_OLD_SOURCES)
			return skb;
		if (pmc->crcount || isquery) {
			/* make sure we have room for group header */
			if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) {
				igmpv3_sendpack(skb);
				skb = NULL; /* add_grhead will get a new one */
			}
			skb = add_grhead(skb, pmc, type, &pgr, mtu);
		}
	}
	if (pgr)
		pgr->grec_nsrcs = htons(scount);

	if (isquery)
		pmc->gsquery = 0;	/* clear query state on report */
	return skb;
}

static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
{
	struct sk_buff *skb = NULL;
	struct net *net = dev_net(in_dev->dev);
	int type;

	if (!pmc) {
		rcu_read_lock();
		for_each_pmc_rcu(in_dev, pmc) {
			if (pmc->multiaddr == IGMP_ALL_HOSTS)
				continue;
			if (ipv4_is_local_multicast(pmc->multiaddr) &&
			     !net->ipv4.sysctl_igmp_llm_reports)
				continue;
			spin_lock_bh(&pmc->lock);
			if (pmc->sfcount[MCAST_EXCLUDE])
				type = IGMPV3_MODE_IS_EXCLUDE;
			else
				type = IGMPV3_MODE_IS_INCLUDE;
			skb = add_grec(skb, pmc, type, 0, 0);
			spin_unlock_bh(&pmc->lock);
		}
		rcu_read_unlock();
	} else {
		spin_lock_bh(&pmc->lock);
		if (pmc->sfcount[MCAST_EXCLUDE])
			type = IGMPV3_MODE_IS_EXCLUDE;
		else
			type = IGMPV3_MODE_IS_INCLUDE;
		skb = add_grec(skb, pmc, type, 0, 0);
		spin_unlock_bh(&pmc->lock);
	}
	if (!skb)
		return 0;
	return igmpv3_sendpack(skb);
}

/*
 * remove zero-count source records from a source filter list
 */
static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
{
	struct ip_sf_list *psf_prev, *psf_next, *psf;

	psf_prev = NULL;
	for (psf = *ppsf; psf; psf = psf_next) {
		psf_next = psf->sf_next;
		if (psf->sf_crcount == 0) {
			if (psf_prev)
				psf_prev->sf_next = psf->sf_next;
			else
				*ppsf = psf->sf_next;
			kfree(psf);
		} else
			psf_prev = psf;
	}
}

static void igmpv3_send_cr(struct in_device *in_dev)
{
	struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
	struct sk_buff *skb = NULL;
	int type, dtype;

	rcu_read_lock();
	spin_lock_bh(&in_dev->mc_tomb_lock);

	/* deleted MCA's */
	pmc_prev = NULL;
	for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) {
		pmc_next = pmc->next;
		if (pmc->sfmode == MCAST_INCLUDE) {
			type = IGMPV3_BLOCK_OLD_SOURCES;
			dtype = IGMPV3_BLOCK_OLD_SOURCES;
			skb = add_grec(skb, pmc, type, 1, 0);
			skb = add_grec(skb, pmc, dtype, 1, 1);
		}
		if (pmc->crcount) {
			if (pmc->sfmode == MCAST_EXCLUDE) {
				type = IGMPV3_CHANGE_TO_INCLUDE;
				skb = add_grec(skb, pmc, type, 1, 0);
			}
			pmc->crcount--;
			if (pmc->crcount == 0) {
				igmpv3_clear_zeros(&pmc->tomb);
				igmpv3_clear_zeros(&pmc->sources);
			}
		}
		if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
			if (pmc_prev)
				pmc_prev->next = pmc_next;
			else
				in_dev->mc_tomb = pmc_next;
			in_dev_put(pmc->interface);
			kfree(pmc);
		} else
			pmc_prev = pmc;
	}
	spin_unlock_bh(&in_dev->mc_tomb_lock);

	/* change recs */
	for_each_pmc_rcu(in_dev, pmc) {
		spin_lock_bh(&pmc->lock);
		if (pmc->sfcount[MCAST_EXCLUDE]) {
			type = IGMPV3_BLOCK_OLD_SOURCES;
			dtype = IGMPV3_ALLOW_NEW_SOURCES;
		} else {
			type = IGMPV3_ALLOW_NEW_SOURCES;
			dtype = IGMPV3_BLOCK_OLD_SOURCES;
		}
		skb = add_grec(skb, pmc, type, 0, 0);
		skb = add_grec(skb, pmc, dtype, 0, 1);	/* deleted sources */

		/* filter mode changes */
		if (pmc->crcount) {
			if (pmc->sfmode == MCAST_EXCLUDE)
				type = IGMPV3_CHANGE_TO_EXCLUDE;
			else
				type = IGMPV3_CHANGE_TO_INCLUDE;
			skb = add_grec(skb, pmc, type, 0, 0);
			pmc->crcount--;
		}
		spin_unlock_bh(&pmc->lock);
	}
	rcu_read_unlock();

	if (!skb)
		return;
	(void) igmpv3_sendpack(skb);
}

static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
	int type)
{
	struct sk_buff *skb;
	struct iphdr *iph;
	struct igmphdr *ih;
	struct rtable *rt;
	struct net_device *dev = in_dev->dev;
	struct net *net = dev_net(dev);
	__be32	group = pmc ? pmc->multiaddr : 0;
	struct flowi4 fl4;
	__be32	dst;
	int hlen, tlen;

	if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
		return igmpv3_send_report(in_dev, pmc);

	if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports)
		return 0;

	if (type == IGMP_HOST_LEAVE_MESSAGE)
		dst = IGMP_ALL_ROUTER;
	else
		dst = group;

	rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
				   0, 0,
				   IPPROTO_IGMP, 0, dev->ifindex);
	if (IS_ERR(rt))
		return -1;

	hlen = LL_RESERVED_SPACE(dev);
	tlen = dev->needed_tailroom;
	skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC);
	if (!skb) {
		ip_rt_put(rt);
		return -1;
	}
	skb->priority = TC_PRIO_CONTROL;

	skb_dst_set(skb, &rt->dst);

	skb_reserve(skb, hlen);

	skb_reset_network_header(skb);
	iph = ip_hdr(skb);
	skb_put(skb, sizeof(struct iphdr) + 4);

	iph->version  = 4;
	iph->ihl      = (sizeof(struct iphdr)+4)>>2;
	iph->tos      = 0xc0;
	iph->frag_off = htons(IP_DF);
	iph->ttl      = 1;
	iph->daddr    = dst;
	iph->saddr    = fl4.saddr;
	iph->protocol = IPPROTO_IGMP;
	ip_select_ident(net, skb, NULL);
	((u8 *)&iph[1])[0] = IPOPT_RA;
	((u8 *)&iph[1])[1] = 4;
	((u8 *)&iph[1])[2] = 0;
	((u8 *)&iph[1])[3] = 0;

	ih = skb_put(skb, sizeof(struct igmphdr));
	ih->type = type;
	ih->code = 0;
	ih->csum = 0;
	ih->group = group;
	ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));

	return ip_local_out(net, skb->sk, skb);
}

static void igmp_gq_timer_expire(unsigned long data)
{
	struct in_device *in_dev = (struct in_device *)data;

	in_dev->mr_gq_running = 0;
	igmpv3_send_report(in_dev, NULL);
	in_dev_put(in_dev);
}

static void igmp_ifc_timer_expire(unsigned long data)
{
	struct in_device *in_dev = (struct in_device *)data;

	igmpv3_send_cr(in_dev);
	if (in_dev->mr_ifc_count) {
		in_dev->mr_ifc_count--;
		igmp_ifc_start_timer(in_dev,
				     unsolicited_report_interval(in_dev));
	}
	in_dev_put(in_dev);
}

static void igmp_ifc_event(struct in_device *in_dev)
{
	struct net *net = dev_net(in_dev->dev);
	if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
		return;
	in_dev->mr_ifc_count = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
	igmp_ifc_start_timer(in_dev, 1);
}


static void igmp_timer_expire(unsigned long data)
{
	struct ip_mc_list *im = (struct ip_mc_list *)data;
	struct in_device *in_dev = im->interface;

	spin_lock(&im->lock);
	im->tm_running = 0;

	if (im->unsolicit_count) {
		im->unsolicit_count--;
		igmp_start_timer(im, unsolicited_report_interval(in_dev));
	}
	im->reporter = 1;
	spin_unlock(&im->lock);

	if (IGMP_V1_SEEN(in_dev))
		igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
	else if (IGMP_V2_SEEN(in_dev))
		igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
	else
		igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);

	ip_ma_put(im);
}

/* mark EXCLUDE-mode sources */
static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
{
	struct ip_sf_list *psf;
	int i, scount;

	scount = 0;
	for (psf = pmc->sources; psf; psf = psf->sf_next) {
		if (scount == nsrcs)
			break;
		for (i = 0; i < nsrcs; i++) {
			/* skip inactive filters */
			if (psf->sf_count[MCAST_INCLUDE] ||
			    pmc->sfcount[MCAST_EXCLUDE] !=
			    psf->sf_count[MCAST_EXCLUDE])
				break;
			if (srcs[i] == psf->sf_inaddr) {
				scount++;
				break;
			}
		}
	}
	pmc->gsquery = 0;
	if (scount == nsrcs)	/* all sources excluded */
		return 0;
	return 1;
}

static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
{
	struct ip_sf_list *psf;
	int i, scount;

	if (pmc->sfmode == MCAST_EXCLUDE)
		return igmp_xmarksources(pmc, nsrcs, srcs);

	/* mark INCLUDE-mode sources */
	scount = 0;
	for (psf = pmc->sources; psf; psf = psf->sf_next) {
		if (scount == nsrcs)
			break;
		for (i = 0; i < nsrcs; i++)
			if (srcs[i] == psf->sf_inaddr) {
				psf->sf_gsresp = 1;
				scount++;
				break;
			}
	}
	if (!scount) {
		pmc->gsquery = 0;
		return 0;
	}
	pmc->gsquery = 1;
	return 1;
}

/* return true if packet was dropped */
static bool igmp_heard_report(struct in_device *in_dev, __be32 group)
{
	struct ip_mc_list *im;
	struct net *net = dev_net(in_dev->dev);

	/* Timers are only set for non-local groups */

	if (group == IGMP_ALL_HOSTS)
		return false;
	if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports)
		return false;

	rcu_read_lock();
	for_each_pmc_rcu(in_dev, im) {
		if (im->multiaddr == group) {
			igmp_stop_timer(im);
			break;
		}
	}
	rcu_read_unlock();
	return false;
}

/* return true if packet was dropped */
static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
	int len)
{
	struct igmphdr 		*ih = igmp_hdr(skb);
	struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
	struct ip_mc_list	*im;
	__be32			group = ih->group;
	int			max_delay;
	int			mark = 0;
	struct net		*net = dev_net(in_dev->dev);


	if (len == 8) {
		if (ih->code == 0) {
			/* Alas, old v1 router presents here. */

			max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
			in_dev->mr_v1_seen = jiffies +
				IGMP_V1_ROUTER_PRESENT_TIMEOUT;
			group = 0;
		} else {
			/* v2 router present */
			max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
			in_dev->mr_v2_seen = jiffies +
				IGMP_V2_ROUTER_PRESENT_TIMEOUT;
		}
		/* cancel the interface change timer */
		in_dev->mr_ifc_count = 0;
		if (del_timer(&in_dev->mr_ifc_timer))
			__in_dev_put(in_dev);
		/* clear deleted report items */
		igmpv3_clear_delrec(in_dev);
	} else if (len < 12) {
		return true;	/* ignore bogus packet; freed by caller */
	} else if (IGMP_V1_SEEN(in_dev)) {
		/* This is a v3 query with v1 queriers present */
		max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
		group = 0;
	} else if (IGMP_V2_SEEN(in_dev)) {
		/* this is a v3 query with v2 queriers present;
		 * Interpretation of the max_delay code is problematic here.
		 * A real v2 host would use ih_code directly, while v3 has a
		 * different encoding. We use the v3 encoding as more likely
		 * to be intended in a v3 query.
		 */
		max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
		if (!max_delay)
			max_delay = 1;	/* can't mod w/ 0 */
	} else { /* v3 */
		if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
			return true;

		ih3 = igmpv3_query_hdr(skb);
		if (ih3->nsrcs) {
			if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
					   + ntohs(ih3->nsrcs)*sizeof(__be32)))
				return true;
			ih3 = igmpv3_query_hdr(skb);
		}

		max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
		if (!max_delay)
			max_delay = 1;	/* can't mod w/ 0 */
		in_dev->mr_maxdelay = max_delay;
		if (ih3->qrv)
			in_dev->mr_qrv = ih3->qrv;
		if (!group) { /* general query */
			if (ih3->nsrcs)
				return true;	/* no sources allowed */
			igmp_gq_start_timer(in_dev);
			return false;
		}
		/* mark sources to include, if group & source-specific */
		mark = ih3->nsrcs != 0;
	}

	/*
	 * - Start the timers in all of our membership records
	 *   that the query applies to for the interface on
	 *   which the query arrived excl. those that belong
	 *   to a "local" group (224.0.0.X)
	 * - For timers already running check if they need to
	 *   be reset.
	 * - Use the igmp->igmp_code field as the maximum
	 *   delay possible
	 */
	rcu_read_lock();
	for_each_pmc_rcu(in_dev, im) {
		int changed;

		if (group && group != im->multiaddr)
			continue;
		if (im->multiaddr == IGMP_ALL_HOSTS)
			continue;
		if (ipv4_is_local_multicast(im->multiaddr) &&
		    !net->ipv4.sysctl_igmp_llm_reports)
			continue;
		spin_lock_bh(&im->lock);
		if (im->tm_running)
			im->gsquery = im->gsquery && mark;
		else
			im->gsquery = mark;
		changed = !im->gsquery ||
			igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
		spin_unlock_bh(&im->lock);
		if (changed)
			igmp_mod_timer(im, max_delay);
	}
	rcu_read_unlock();
	return false;
}

/* called in rcu_read_lock() section */
int igmp_rcv(struct sk_buff *skb)
{
	/* This basically follows the spec line by line -- see RFC1112 */
	struct igmphdr *ih;
	struct net_device *dev = skb->dev;
	struct in_device *in_dev;
	int len = skb->len;
	bool dropped = true;

	if (netif_is_l3_master(dev)) {
		dev = dev_get_by_index_rcu(dev_net(dev), IPCB(skb)->iif);
		if (!dev)
			goto drop;
	}

	in_dev = __in_dev_get_rcu(dev);
	if (!in_dev)
		goto drop;

	if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
		goto drop;

	if (skb_checksum_simple_validate(skb))
		goto drop;

	ih = igmp_hdr(skb);
	switch (ih->type) {
	case IGMP_HOST_MEMBERSHIP_QUERY:
		dropped = igmp_heard_query(in_dev, skb, len);
		break;
	case IGMP_HOST_MEMBERSHIP_REPORT:
	case IGMPV2_HOST_MEMBERSHIP_REPORT:
		/* Is it our report looped back? */
		if (rt_is_output_route(skb_rtable(skb)))
			break;
		/* don't rely on MC router hearing unicast reports */
		if (skb->pkt_type == PACKET_MULTICAST ||
		    skb->pkt_type == PACKET_BROADCAST)
			dropped = igmp_heard_report(in_dev, ih->group);
		break;
	case IGMP_PIM:
#ifdef CONFIG_IP_PIMSM_V1
		return pim_rcv_v1(skb);
#endif
	case IGMPV3_HOST_MEMBERSHIP_REPORT:
	case IGMP_DVMRP:
	case IGMP_TRACE:
	case IGMP_HOST_LEAVE_MESSAGE:
	case IGMP_MTRACE:
	case IGMP_MTRACE_RESP:
		break;
	default:
		break;
	}

drop:
	if (dropped)
		kfree_skb(skb);
	else
		consume_skb(skb);
	return 0;
}

#endif


/*
 *	Add a filter to a device
 */

static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
{
	char buf[MAX_ADDR_LEN];
	struct net_device *dev = in_dev->dev;

	/* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
	   We will get multicast token leakage, when IFF_MULTICAST
	   is changed. This check should be done in ndo_set_rx_mode
	   routine. Something sort of:
	   if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
	   --ANK
	   */
	if (arp_mc_map(addr, buf, dev, 0) == 0)
		dev_mc_add(dev, buf);
}

/*
 *	Remove a filter from a device
 */

static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
{
	char buf[MAX_ADDR_LEN];
	struct net_device *dev = in_dev->dev;

	if (arp_mc_map(addr, buf, dev, 0) == 0)
		dev_mc_del(dev, buf);
}

#ifdef CONFIG_IP_MULTICAST
/*
 * deleted ip_mc_list manipulation
 */
static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
{
	struct ip_mc_list *pmc;
	struct net *net = dev_net(in_dev->dev);

	/* this is an "ip_mc_list" for convenience; only the fields below
	 * are actually used. In particular, the refcnt and users are not
	 * used for management of the delete list. Using the same structure
	 * for deleted items allows change reports to use common code with
	 * non-deleted or query-response MCA's.
	 */
	pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
	if (!pmc)
		return;
	spin_lock_init(&pmc->lock);
	spin_lock_bh(&im->lock);
	pmc->interface = im->interface;
	in_dev_hold(in_dev);
	pmc->multiaddr = im->multiaddr;
	pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
	pmc->sfmode = im->sfmode;
	if (pmc->sfmode == MCAST_INCLUDE) {
		struct ip_sf_list *psf;

		pmc->tomb = im->tomb;
		pmc->sources = im->sources;
		im->tomb = im->sources = NULL;
		for (psf = pmc->sources; psf; psf = psf->sf_next)
			psf->sf_crcount = pmc->crcount;
	}
	spin_unlock_bh(&im->lock);

	spin_lock_bh(&in_dev->mc_tomb_lock);
	pmc->next = in_dev->mc_tomb;
	in_dev->mc_tomb = pmc;
	spin_unlock_bh(&in_dev->mc_tomb_lock);
}

/*
 * restore ip_mc_list deleted records
 */
static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im)
{
	struct ip_mc_list *pmc, *pmc_prev;
	struct ip_sf_list *psf;
	struct net *net = dev_net(in_dev->dev);
	__be32 multiaddr = im->multiaddr;

	spin_lock_bh(&in_dev->mc_tomb_lock);
	pmc_prev = NULL;
	for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) {
		if (pmc->multiaddr == multiaddr)
			break;
		pmc_prev = pmc;
	}
	if (pmc) {
		if (pmc_prev)
			pmc_prev->next = pmc->next;
		else
			in_dev->mc_tomb = pmc->next;
	}
	spin_unlock_bh(&in_dev->mc_tomb_lock);

	spin_lock_bh(&im->lock);
	if (pmc) {
		im->interface = pmc->interface;
		im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
		im->sfmode = pmc->sfmode;
		if (pmc->sfmode == MCAST_INCLUDE) {
			im->tomb = pmc->tomb;
			im->sources = pmc->sources;
			for (psf = im->sources; psf; psf = psf->sf_next)
				psf->sf_crcount = im->crcount;
		}
		in_dev_put(pmc->interface);
		kfree(pmc);
	}
	spin_unlock_bh(&im->lock);
}

/*
 * flush ip_mc_list deleted records
 */
static void igmpv3_clear_delrec(struct in_device *in_dev)
{
	struct ip_mc_list *pmc, *nextpmc;

	spin_lock_bh(&in_dev->mc_tomb_lock);
	pmc = in_dev->mc_tomb;
	in_dev->mc_tomb = NULL;
	spin_unlock_bh(&in_dev->mc_tomb_lock);

	for (; pmc; pmc = nextpmc) {
		nextpmc = pmc->next;
		ip_mc_clear_src(pmc);
		in_dev_put(pmc->interface);
		kfree(pmc);
	}
	/* clear dead sources, too */
	rcu_read_lock();
	for_each_pmc_rcu(in_dev, pmc) {
		struct ip_sf_list *psf, *psf_next;

		spin_lock_bh(&pmc->lock);
		psf = pmc->tomb;
		pmc->tomb = NULL;
		spin_unlock_bh(&pmc->lock);
		for (; psf; psf = psf_next) {
			psf_next = psf->sf_next;
			kfree(psf);
		}
	}
	rcu_read_unlock();
}
#endif

static void igmp_group_dropped(struct ip_mc_list *im)
{
	struct in_device *in_dev = im->interface;
#ifdef CONFIG_IP_MULTICAST
	struct net *net = dev_net(in_dev->dev);
	int reporter;
#endif

	if (im->loaded) {
		im->loaded = 0;
		ip_mc_filter_del(in_dev, im->multiaddr);
	}

#ifdef CONFIG_IP_MULTICAST
	if (im->multiaddr == IGMP_ALL_HOSTS)
		return;
	if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports)
		return;

	reporter = im->reporter;
	igmp_stop_timer(im);

	if (!in_dev->dead) {
		if (IGMP_V1_SEEN(in_dev))
			return;
		if (IGMP_V2_SEEN(in_dev)) {
			if (reporter)
				igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
			return;
		}
		/* IGMPv3 */
		igmpv3_add_delrec(in_dev, im);

		igmp_ifc_event(in_dev);
	}
#endif
}

static void igmp_group_added(struct ip_mc_list *im)
{
	struct in_device *in_dev = im->interface;
#ifdef CONFIG_IP_MULTICAST
	struct net *net = dev_net(in_dev->dev);
#endif

	if (im->loaded == 0) {
		im->loaded = 1;
		ip_mc_filter_add(in_dev, im->multiaddr);
	}

#ifdef CONFIG_IP_MULTICAST
	if (im->multiaddr == IGMP_ALL_HOSTS)
		return;
	if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports)
		return;

	if (in_dev->dead)
		return;
	if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
		spin_lock_bh(&im->lock);
		igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY);
		spin_unlock_bh(&im->lock);
		return;
	}
	/* else, v3 */

	im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
	igmp_ifc_event(in_dev);
#endif
}


/*
 *	Multicast list managers
 */

static u32 ip_mc_hash(const struct ip_mc_list *im)
{
	return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG);
}

static void ip_mc_hash_add(struct in_device *in_dev,
			   struct ip_mc_list *im)
{
	struct ip_mc_list __rcu **mc_hash;
	u32 hash;

	mc_hash = rtnl_dereference(in_dev->mc_hash);
	if (mc_hash) {
		hash = ip_mc_hash(im);
		im->next_hash = mc_hash[hash];
		rcu_assign_pointer(mc_hash[hash], im);
		return;
	}

	/* do not use a hash table for small number of items */
	if (in_dev->mc_count < 4)
		return;

	mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG,
			  GFP_KERNEL);
	if (!mc_hash)
		return;

	for_each_pmc_rtnl(in_dev, im) {
		hash = ip_mc_hash(im);
		im->next_hash = mc_hash[hash];
		RCU_INIT_POINTER(mc_hash[hash], im);
	}

	rcu_assign_pointer(in_dev->mc_hash, mc_hash);
}

static void ip_mc_hash_remove(struct in_device *in_dev,
			      struct ip_mc_list *im)
{
	struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash);
	struct ip_mc_list *aux;

	if (!mc_hash)
		return;
	mc_hash += ip_mc_hash(im);
	while ((aux = rtnl_dereference(*mc_hash)) != im)
		mc_hash = &aux->next_hash;
	*mc_hash = im->next_hash;
}


/*
 *	A socket has joined a multicast group on device dev.
 */

void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
{
	struct ip_mc_list *im;
#ifdef CONFIG_IP_MULTICAST
	struct net *net = dev_net(in_dev->dev);
#endif

	ASSERT_RTNL();

	for_each_pmc_rtnl(in_dev, im) {
		if (im->multiaddr == addr) {
			im->users++;
			ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
			goto out;
		}
	}

	im = kzalloc(sizeof(*im), GFP_KERNEL);
	if (!im)
		goto out;

	im->users = 1;
	im->interface = in_dev;
	in_dev_hold(in_dev);
	im->multiaddr = addr;
	/* initial mode is (EX, empty) */
	im->sfmode = MCAST_EXCLUDE;
	im->sfcount[MCAST_EXCLUDE] = 1;
	refcount_set(&im->refcnt, 1);
	spin_lock_init(&im->lock);
#ifdef CONFIG_IP_MULTICAST
	setup_timer(&im->timer, igmp_timer_expire, (unsigned long)im);
	im->unsolicit_count = net->ipv4.sysctl_igmp_qrv;
#endif

	im->next_rcu = in_dev->mc_list;
	in_dev->mc_count++;
	rcu_assign_pointer(in_dev->mc_list, im);

	ip_mc_hash_add(in_dev, im);

#ifdef CONFIG_IP_MULTICAST
	igmpv3_del_delrec(in_dev, im);
#endif
	igmp_group_added(im);
	if (!in_dev->dead)
		ip_rt_multicast_event(in_dev);
out:
	return;
}
EXPORT_SYMBOL(ip_mc_inc_group);

static int ip_mc_check_iphdr(struct sk_buff *skb)
{
	const struct iphdr *iph;
	unsigned int len;
	unsigned int offset = skb_network_offset(skb) + sizeof(*iph);

	if (!pskb_may_pull(skb, offset))
		return -EINVAL;

	iph = ip_hdr(skb);

	if (iph->version != 4 || ip_hdrlen(skb) < sizeof(*iph))
		return -EINVAL;

	offset += ip_hdrlen(skb) - sizeof(*iph);

	if (!pskb_may_pull(skb, offset))
		return -EINVAL;

	iph = ip_hdr(skb);

	if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
		return -EINVAL;

	len = skb_network_offset(skb) + ntohs(iph->tot_len);
	if (skb->len < len || len < offset)
		return -EINVAL;

	skb_set_transport_header(skb, offset);

	return 0;
}

static int ip_mc_check_igmp_reportv3(struct sk_buff *skb)
{
	unsigned int len = skb_transport_offset(skb);

	len += sizeof(struct igmpv3_report);

	return pskb_may_pull(skb, len) ? 0 : -EINVAL;
}

static int ip_mc_check_igmp_query(struct sk_buff *skb)
{
	unsigned int len = skb_transport_offset(skb);

	len += sizeof(struct igmphdr);
	if (skb->len < len)
		return -EINVAL;

	/* IGMPv{1,2}? */
	if (skb->len != len) {
		/* or IGMPv3? */
		len += sizeof(struct igmpv3_query) - sizeof(struct igmphdr);
		if (skb->len < len || !pskb_may_pull(skb, len))
			return -EINVAL;
	}

	/* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer
	 * all-systems destination addresses (224.0.0.1) for general queries
	 */
	if (!igmp_hdr(skb)->group &&
	    ip_hdr(skb)->daddr != htonl(INADDR_ALLHOSTS_GROUP))
		return -EINVAL;

	return 0;
}

static int ip_mc_check_igmp_msg(struct sk_buff *skb)
{
	switch (igmp_hdr(skb)->type) {
	case IGMP_HOST_LEAVE_MESSAGE:
	case IGMP_HOST_MEMBERSHIP_REPORT:
	case IGMPV2_HOST_MEMBERSHIP_REPORT:
		/* fall through */
		return 0;
	case IGMPV3_HOST_MEMBERSHIP_REPORT:
		return ip_mc_check_igmp_reportv3(skb);
	case IGMP_HOST_MEMBERSHIP_QUERY:
		return ip_mc_check_igmp_query(skb);
	default:
		return -ENOMSG;
	}
}

static inline __sum16 ip_mc_validate_checksum(struct sk_buff *skb)
{
	return skb_checksum_simple_validate(skb);
}

static int __ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed)

{
	struct sk_buff *skb_chk;
	unsigned int transport_len;
	unsigned int len = skb_transport_offset(skb) + sizeof(struct igmphdr);
	int ret = -EINVAL;

	transport_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);

	skb_chk = skb_checksum_trimmed(skb, transport_len,
				       ip_mc_validate_checksum);
	if (!skb_chk)
		goto err;

	if (!pskb_may_pull(skb_chk, len))
		goto err;

	ret = ip_mc_check_igmp_msg(skb_chk);
	if (ret)
		goto err;

	if (skb_trimmed)
		*skb_trimmed = skb_chk;
	/* free now unneeded clone */
	else if (skb_chk != skb)
		kfree_skb(skb_chk);

	ret = 0;

err:
	if (ret && skb_chk && skb_chk != skb)
		kfree_skb(skb_chk);

	return ret;
}

/**
 * ip_mc_check_igmp - checks whether this is a sane IGMP packet
 * @skb: the skb to validate
 * @skb_trimmed: to store an skb pointer trimmed to IPv4 packet tail (optional)
 *
 * Checks whether an IPv4 packet is a valid IGMP packet. If so sets
 * skb transport header accordingly and returns zero.
 *
 * -EINVAL: A broken packet was detected, i.e. it violates some internet
 *  standard
 * -ENOMSG: IP header validation succeeded but it is not an IGMP packet.
 * -ENOMEM: A memory allocation failure happened.
 *
 * Optionally, an skb pointer might be provided via skb_trimmed (or set it
 * to NULL): After parsing an IGMP packet successfully it will point to
 * an skb which has its tail aligned to the IP packet end. This might
 * either be the originally provided skb or a trimmed, cloned version if
 * the skb frame had data beyond the IP packet. A cloned skb allows us
 * to leave the original skb and its full frame unchanged (which might be
 * desirable for layer 2 frame jugglers).
 *
 * Caller needs to set the skb network header and free any returned skb if it
 * differs from the provided skb.
 */
int ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed)
{
	int ret = ip_mc_check_iphdr(skb);

	if (ret < 0)
		return ret;

	if (ip_hdr(skb)->protocol != IPPROTO_IGMP)
		return -ENOMSG;

	return __ip_mc_check_igmp(skb, skb_trimmed);
}
EXPORT_SYMBOL(ip_mc_check_igmp);

/*
 *	Resend IGMP JOIN report; used by netdev notifier.
 */
static void ip_mc_rejoin_groups(struct in_device *in_dev)
{
#ifdef CONFIG_IP_MULTICAST
	struct ip_mc_list *im;
	int type;
	struct net *net = dev_net(in_dev->dev);

	ASSERT_RTNL();

	for_each_pmc_rtnl(in_dev, im) {
		if (im->multiaddr == IGMP_ALL_HOSTS)
			continue;
		if (ipv4_is_local_multicast(im->multiaddr) &&
		    !net->ipv4.sysctl_igmp_llm_reports)
			continue;

		/* a failover is happening and switches
		 * must be notified immediately
		 */
		if (IGMP_V1_SEEN(in_dev))
			type = IGMP_HOST_MEMBERSHIP_REPORT;
		else if (IGMP_V2_SEEN(in_dev))
			type = IGMPV2_HOST_MEMBERSHIP_REPORT;
		else
			type = IGMPV3_HOST_MEMBERSHIP_REPORT;
		igmp_send_report(in_dev, im, type);
	}
#endif
}

/*
 *	A socket has left a multicast group on device dev
 */

void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
{
	struct ip_mc_list *i;
	struct ip_mc_list __rcu **ip;

	ASSERT_RTNL();

	for (ip = &in_dev->mc_list;
	     (i = rtnl_dereference(*ip)) != NULL;
	     ip = &i->next_rcu) {
		if (i->multiaddr == addr) {
			if (--i->users == 0) {
				ip_mc_hash_remove(in_dev, i);
				*ip = i->next_rcu;
				in_dev->mc_count--;
				igmp_group_dropped(i);
				ip_mc_clear_src(i);

				if (!in_dev->dead)
					ip_rt_multicast_event(in_dev);

				ip_ma_put(i);
				return;
			}
			break;
		}
	}
}
EXPORT_SYMBOL(ip_mc_dec_group);

/* Device changing type */

void ip_mc_unmap(struct in_device *in_dev)
{
	struct ip_mc_list *pmc;

	ASSERT_RTNL();

	for_each_pmc_rtnl(in_dev, pmc)
		igmp_group_dropped(pmc);
}

void ip_mc_remap(struct in_device *in_dev)
{
	struct ip_mc_list *pmc;

	ASSERT_RTNL();

	for_each_pmc_rtnl(in_dev, pmc) {
#ifdef CONFIG_IP_MULTICAST
		igmpv3_del_delrec(in_dev, pmc);
#endif
		igmp_group_added(pmc);
	}
}

/* Device going down */

void ip_mc_down(struct in_device *in_dev)
{
	struct ip_mc_list *pmc;

	ASSERT_RTNL();

	for_each_pmc_rtnl(in_dev, pmc)
		igmp_group_dropped(pmc);

#ifdef CONFIG_IP_MULTICAST
	in_dev->mr_ifc_count = 0;
	if (del_timer(&in_dev->mr_ifc_timer))
		__in_dev_put(in_dev);
	in_dev->mr_gq_running = 0;
	if (del_timer(&in_dev->mr_gq_timer))
		__in_dev_put(in_dev);
#endif

	ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
}

void ip_mc_init_dev(struct in_device *in_dev)
{
#ifdef CONFIG_IP_MULTICAST
	struct net *net = dev_net(in_dev->dev);
#endif
	ASSERT_RTNL();

#ifdef CONFIG_IP_MULTICAST
	setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
			(unsigned long)in_dev);
	setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
			(unsigned long)in_dev);
	in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv;
#endif

	spin_lock_init(&in_dev->mc_tomb_lock);
}

/* Device going up */

void ip_mc_up(struct in_device *in_dev)
{
	struct ip_mc_list *pmc;
#ifdef CONFIG_IP_MULTICAST
	struct net *net = dev_net(in_dev->dev);
#endif

	ASSERT_RTNL();

#ifdef CONFIG_IP_MULTICAST
	in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv;
#endif
	ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);

	for_each_pmc_rtnl(in_dev, pmc) {
#ifdef CONFIG_IP_MULTICAST
		igmpv3_del_delrec(in_dev, pmc);
#endif
		igmp_group_added(pmc);
	}
}

/*
 *	Device is about to be destroyed: clean up.
 */

void ip_mc_destroy_dev(struct in_device *in_dev)
{
	struct ip_mc_list *i;

	ASSERT_RTNL();

	/* Deactivate timers */
	ip_mc_down(in_dev);
#ifdef CONFIG_IP_MULTICAST
	igmpv3_clear_delrec(in_dev);
#endif

	while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
		in_dev->mc_list = i->next_rcu;
		in_dev->mc_count--;
		ip_ma_put(i);
	}
}

/* RTNL is locked */
static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
{
	struct net_device *dev = NULL;
	struct in_device *idev = NULL;

	if (imr->imr_ifindex) {
		idev = inetdev_by_index(net, imr->imr_ifindex);
		return idev;
	}
	if (imr->imr_address.s_addr) {
		dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
		if (!dev)
			return NULL;
	}

	if (!dev) {
		struct rtable *rt = ip_route_output(net,
						    imr->imr_multiaddr.s_addr,
						    0, 0, 0);
		if (!IS_ERR(rt)) {
			dev = rt->dst.dev;
			ip_rt_put(rt);
		}
	}
	if (dev) {
		imr->imr_ifindex = dev->ifindex;
		idev = __in_dev_get_rtnl(dev);
	}
	return idev;
}

/*
 *	Join a socket to a group
 */

static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
	__be32 *psfsrc)
{
	struct ip_sf_list *psf, *psf_prev;
	int rv = 0;

	psf_prev = NULL;
	for (psf = pmc->sources; psf; psf = psf->sf_next) {
		if (psf->sf_inaddr == *psfsrc)
			break;
		psf_prev = psf;
	}
	if (!psf || psf->sf_count[sfmode] == 0) {
		/* source filter not found, or count wrong =>  bug */
		return -ESRCH;
	}
	psf->sf_count[sfmode]--;
	if (psf->sf_count[sfmode] == 0) {
		ip_rt_multicast_event(pmc->interface);
	}
	if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
#ifdef CONFIG_IP_MULTICAST
		struct in_device *in_dev = pmc->interface;
		struct net *net = dev_net(in_dev->dev);
#endif

		/* no more filters for this source */
		if (psf_prev)
			psf_prev->sf_next = psf->sf_next;
		else
			pmc->sources = psf->sf_next;
#ifdef CONFIG_IP_MULTICAST
		if (psf->sf_oldin &&
		    !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
			psf->sf_crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
			psf->sf_next = pmc->tomb;
			pmc->tomb = psf;
			rv = 1;
		} else
#endif
			kfree(psf);
	}
	return rv;
}

#ifndef CONFIG_IP_MULTICAST
#define igmp_ifc_event(x)	do { } while (0)
#endif

static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
			 int sfcount, __be32 *psfsrc, int delta)
{
	struct ip_mc_list *pmc;
	int	changerec = 0;
	int	i, err;

	if (!in_dev)
		return -ENODEV;
	rcu_read_lock();
	for_each_pmc_rcu(in_dev, pmc) {
		if (*pmca == pmc->multiaddr)
			break;
	}
	if (!pmc) {
		/* MCA not found?? bug */
		rcu_read_unlock();
		return -ESRCH;
	}
	spin_lock_bh(&pmc->lock);
	rcu_read_unlock();
#ifdef CONFIG_IP_MULTICAST
	sf_markstate(pmc);
#endif
	if (!delta) {
		err = -EINVAL;
		if (!pmc->sfcount[sfmode])
			goto out_unlock;
		pmc->sfcount[sfmode]--;
	}
	err = 0;
	for (i = 0; i < sfcount; i++) {
		int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);

		changerec |= rv > 0;
		if (!err && rv < 0)
			err = rv;
	}
	if (pmc->sfmode == MCAST_EXCLUDE &&
	    pmc->sfcount[MCAST_EXCLUDE] == 0 &&
	    pmc->sfcount[MCAST_INCLUDE]) {
#ifdef CONFIG_IP_MULTICAST
		struct ip_sf_list *psf;
		struct net *net = dev_net(in_dev->dev);
#endif

		/* filter mode change */
		pmc->sfmode = MCAST_INCLUDE;
#ifdef CONFIG_IP_MULTICAST
		pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
		in_dev->mr_ifc_count = pmc->crcount;
		for (psf = pmc->sources; psf; psf = psf->sf_next)
			psf->sf_crcount = 0;
		igmp_ifc_event(pmc->interface);
	} else if (sf_setstate(pmc) || changerec) {
		igmp_ifc_event(pmc->interface);
#endif
	}
out_unlock:
	spin_unlock_bh(&pmc->lock);
	return err;
}

/*
 * Add multicast single-source filter to the interface list
 */
static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
	__be32 *psfsrc)
{
	struct ip_sf_list *psf, *psf_prev;

	psf_prev = NULL;
	for (psf = pmc->sources; psf; psf = psf->sf_next) {
		if (psf->sf_inaddr == *psfsrc)
			break;
		psf_prev = psf;
	}
	if (!psf) {
		psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
		if (!psf)
			return -ENOBUFS;
		psf->sf_inaddr = *psfsrc;
		if (psf_prev) {
			psf_prev->sf_next = psf;
		} else
			pmc->sources = psf;
	}
	psf->sf_count[sfmode]++;
	if (psf->sf_count[sfmode] == 1) {
		ip_rt_multicast_event(pmc->interface);
	}
	return 0;
}

#ifdef CONFIG_IP_MULTICAST
static void sf_markstate(struct ip_mc_list *pmc)
{
	struct ip_sf_list *psf;
	int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];

	for (psf = pmc->sources; psf; psf = psf->sf_next)
		if (pmc->sfcount[MCAST_EXCLUDE]) {
			psf->sf_oldin = mca_xcount ==
				psf->sf_count[MCAST_EXCLUDE] &&
				!psf->sf_count[MCAST_INCLUDE];
		} else
			psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
}

static int sf_setstate(struct ip_mc_list *pmc)
{
	struct ip_sf_list *psf, *dpsf;
	int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
	int qrv = pmc->interface->mr_qrv;
	int new_in, rv;

	rv = 0;
	for (psf = pmc->sources; psf; psf = psf->sf_next) {
		if (pmc->sfcount[MCAST_EXCLUDE]) {
			new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
				!psf->sf_count[MCAST_INCLUDE];
		} else
			new_in = psf->sf_count[MCAST_INCLUDE] != 0;
		if (new_in) {
			if (!psf->sf_oldin) {
				struct ip_sf_list *prev = NULL;

				for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) {
					if (dpsf->sf_inaddr == psf->sf_inaddr)
						break;
					prev = dpsf;
				}
				if (dpsf) {
					if (prev)
						prev->sf_next = dpsf->sf_next;
					else
						pmc->tomb = dpsf->sf_next;
					kfree(dpsf);
				}
				psf->sf_crcount = qrv;
				rv++;
			}
		} else if (psf->sf_oldin) {

			psf->sf_crcount = 0;
			/*
			 * add or update "delete" records if an active filter
			 * is now inactive
			 */
			for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next)
				if (dpsf->sf_inaddr == psf->sf_inaddr)
					break;
			if (!dpsf) {
				dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
				if (!dpsf)
					continue;
				*dpsf = *psf;
				/* pmc->lock held by callers */
				dpsf->sf_next = pmc->tomb;
				pmc->tomb = dpsf;
			}
			dpsf->sf_crcount = qrv;
			rv++;
		}
	}
	return rv;
}
#endif

/*
 * Add multicast source filter list to the interface list
 */
static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
			 int sfcount, __be32 *psfsrc, int delta)
{
	struct ip_mc_list *pmc;
	int	isexclude;
	int	i, err;

	if (!in_dev)
		return -ENODEV;
	rcu_read_lock();
	for_each_pmc_rcu(in_dev, pmc) {
		if (*pmca == pmc->multiaddr)
			break;
	}
	if (!pmc) {
		/* MCA not found?? bug */
		rcu_read_unlock();
		return -ESRCH;
	}
	spin_lock_bh(&pmc->lock);
	rcu_read_unlock();

#ifdef CONFIG_IP_MULTICAST
	sf_markstate(pmc);
#endif
	isexclude = pmc->sfmode == MCAST_EXCLUDE;
	if (!delta)
		pmc->sfcount[sfmode]++;
	err = 0;
	for (i = 0; i < sfcount; i++) {
		err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]);
		if (err)
			break;
	}
	if (err) {
		int j;

		if (!delta)
			pmc->sfcount[sfmode]--;
		for (j = 0; j < i; j++)
			(void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
	} else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
#ifdef CONFIG_IP_MULTICAST
		struct ip_sf_list *psf;
		struct net *net = dev_net(pmc->interface->dev);
		in_dev = pmc->interface;
#endif

		/* filter mode change */
		if (pmc->sfcount[MCAST_EXCLUDE])
			pmc->sfmode = MCAST_EXCLUDE;
		else if (pmc->sfcount[MCAST_INCLUDE])
			pmc->sfmode = MCAST_INCLUDE;
#ifdef CONFIG_IP_MULTICAST
		/* else no filters; keep old mode for reports */

		pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
		in_dev->mr_ifc_count = pmc->crcount;
		for (psf = pmc->sources; psf; psf = psf->sf_next)
			psf->sf_crcount = 0;
		igmp_ifc_event(in_dev);
	} else if (sf_setstate(pmc)) {
		igmp_ifc_event(in_dev);
#endif
	}
	spin_unlock_bh(&pmc->lock);
	return err;
}

static void ip_mc_clear_src(struct ip_mc_list *pmc)
{
	struct ip_sf_list *psf, *nextpsf, *tomb, *sources;

	spin_lock_bh(&pmc->lock);
	tomb = pmc->tomb;
	pmc->tomb = NULL;
	sources = pmc->sources;
	pmc->sources = NULL;
	pmc->sfmode = MCAST_EXCLUDE;
	pmc->sfcount[MCAST_INCLUDE] = 0;
	pmc->sfcount[MCAST_EXCLUDE] = 1;
	spin_unlock_bh(&pmc->lock);

	for (psf = tomb; psf; psf = nextpsf) {
		nextpsf = psf->sf_next;
		kfree(psf);
	}
	for (psf = sources; psf; psf = nextpsf) {
		nextpsf = psf->sf_next;
		kfree(psf);
	}
}

/* Join a multicast group
 */

int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr)
{
	__be32 addr = imr->imr_multiaddr.s_addr;
	struct ip_mc_socklist *iml, *i;
	struct in_device *in_dev;
	struct inet_sock *inet = inet_sk(sk);
	struct net *net = sock_net(sk);
	int ifindex;
	int count = 0;
	int err;

	ASSERT_RTNL();

	if (!ipv4_is_multicast(addr))
		return -EINVAL;

	in_dev = ip_mc_find_dev(net, imr);

	if (!in_dev) {
		err = -ENODEV;
		goto done;
	}

	err = -EADDRINUSE;
	ifindex = imr->imr_ifindex;
	for_each_pmc_rtnl(inet, i) {
		if (i->multi.imr_multiaddr.s_addr == addr &&
		    i->multi.imr_ifindex == ifindex)
			goto done;
		count++;
	}
	err = -ENOBUFS;
	if (count >= net->ipv4.sysctl_igmp_max_memberships)
		goto done;
	iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
	if (!iml)
		goto done;

	memcpy(&iml->multi, imr, sizeof(*imr));
	iml->next_rcu = inet->mc_list;
	iml->sflist = NULL;
	iml->sfmode = MCAST_EXCLUDE;
	rcu_assign_pointer(inet->mc_list, iml);
	ip_mc_inc_group(in_dev, addr);
	err = 0;
done:
	return err;
}
EXPORT_SYMBOL(ip_mc_join_group);

static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
			   struct in_device *in_dev)
{
	struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
	int err;

	if (!psf) {
		/* any-source empty exclude case */
		return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
			iml->sfmode, 0, NULL, 0);
	}
	err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
			iml->sfmode, psf->sl_count, psf->sl_addr, 0);
	RCU_INIT_POINTER(iml->sflist, NULL);
	/* decrease mem now to avoid the memleak warning */
	atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
	kfree_rcu(psf, rcu);
	return err;
}

int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
{
	struct inet_sock *inet = inet_sk(sk);
	struct ip_mc_socklist *iml;
	struct ip_mc_socklist __rcu **imlp;
	struct in_device *in_dev;
	struct net *net = sock_net(sk);
	__be32 group = imr->imr_multiaddr.s_addr;
	u32 ifindex;
	int ret = -EADDRNOTAVAIL;

	ASSERT_RTNL();

	in_dev = ip_mc_find_dev(net, imr);
	if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) {
		ret = -ENODEV;
		goto out;
	}
	ifindex = imr->imr_ifindex;
	for (imlp = &inet->mc_list;
	     (iml = rtnl_dereference(*imlp)) != NULL;
	     imlp = &iml->next_rcu) {
		if (iml->multi.imr_multiaddr.s_addr != group)
			continue;
		if (ifindex) {
			if (iml->multi.imr_ifindex != ifindex)
				continue;
		} else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
				iml->multi.imr_address.s_addr)
			continue;

		(void) ip_mc_leave_src(sk, iml, in_dev);

		*imlp = iml->next_rcu;

		if (in_dev)
			ip_mc_dec_group(in_dev, group);

		/* decrease mem now to avoid the memleak warning */
		atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
		kfree_rcu(iml, rcu);
		return 0;
	}
out:
	return ret;
}
EXPORT_SYMBOL(ip_mc_leave_group);

int ip_mc_source(int add, int omode, struct sock *sk, struct
	ip_mreq_source *mreqs, int ifindex)
{
	int err;
	struct ip_mreqn imr;
	__be32 addr = mreqs->imr_multiaddr;
	struct ip_mc_socklist *pmc;
	struct in_device *in_dev = NULL;
	struct inet_sock *inet = inet_sk(sk);
	struct ip_sf_socklist *psl;
	struct net *net = sock_net(sk);
	int leavegroup = 0;
	int i, j, rv;

	if (!ipv4_is_multicast(addr))
		return -EINVAL;

	ASSERT_RTNL();

	imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
	imr.imr_address.s_addr = mreqs->imr_interface;
	imr.imr_ifindex = ifindex;
	in_dev = ip_mc_find_dev(net, &imr);

	if (!in_dev) {
		err = -ENODEV;
		goto done;
	}
	err = -EADDRNOTAVAIL;

	for_each_pmc_rtnl(inet, pmc) {
		if ((pmc->multi.imr_multiaddr.s_addr ==
		     imr.imr_multiaddr.s_addr) &&
		    (pmc->multi.imr_ifindex == imr.imr_ifindex))
			break;
	}
	if (!pmc) {		/* must have a prior join */
		err = -EINVAL;
		goto done;
	}
	/* if a source filter was set, must be the same mode as before */
	if (pmc->sflist) {
		if (pmc->sfmode != omode) {
			err = -EINVAL;
			goto done;
		}
	} else if (pmc->sfmode != omode) {
		/* allow mode switches for empty-set filters */
		ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
		ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
			NULL, 0);
		pmc->sfmode = omode;
	}

	psl = rtnl_dereference(pmc->sflist);
	if (!add) {
		if (!psl)
			goto done;	/* err = -EADDRNOTAVAIL */
		rv = !0;
		for (i = 0; i < psl->sl_count; i++) {
			rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
				sizeof(__be32));
			if (rv == 0)
				break;
		}
		if (rv)		/* source not found */
			goto done;	/* err = -EADDRNOTAVAIL */

		/* special case - (INCLUDE, empty) == LEAVE_GROUP */
		if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
			leavegroup = 1;
			goto done;
		}

		/* update the interface filter */
		ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
			&mreqs->imr_sourceaddr, 1);

		for (j = i+1; j < psl->sl_count; j++)
			psl->sl_addr[j-1] = psl->sl_addr[j];
		psl->sl_count--;
		err = 0;
		goto done;
	}
	/* else, add a new source to the filter */

	if (psl && psl->sl_count >= net->ipv4.sysctl_igmp_max_msf) {
		err = -ENOBUFS;
		goto done;
	}
	if (!psl || psl->sl_count == psl->sl_max) {
		struct ip_sf_socklist *newpsl;
		int count = IP_SFBLOCK;

		if (psl)
			count += psl->sl_max;
		newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
		if (!newpsl) {
			err = -ENOBUFS;
			goto done;
		}
		newpsl->sl_max = count;
		newpsl->sl_count = count - IP_SFBLOCK;
		if (psl) {
			for (i = 0; i < psl->sl_count; i++)
				newpsl->sl_addr[i] = psl->sl_addr[i];
			/* decrease mem now to avoid the memleak warning */
			atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
			kfree_rcu(psl, rcu);
		}
		rcu_assign_pointer(pmc->sflist, newpsl);
		psl = newpsl;
	}
	rv = 1;	/* > 0 for insert logic below if sl_count is 0 */
	for (i = 0; i < psl->sl_count; i++) {
		rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
			sizeof(__be32));
		if (rv == 0)
			break;
	}
	if (rv == 0)		/* address already there is an error */
		goto done;
	for (j = psl->sl_count-1; j >= i; j--)
		psl->sl_addr[j+1] = psl->sl_addr[j];
	psl->sl_addr[i] = mreqs->imr_sourceaddr;
	psl->sl_count++;
	err = 0;
	/* update the interface list */
	ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
		&mreqs->imr_sourceaddr, 1);
done:
	if (leavegroup)
		err = ip_mc_leave_group(sk, &imr);
	return err;
}

int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
{
	int err = 0;
	struct ip_mreqn	imr;
	__be32 addr = msf->imsf_multiaddr;
	struct ip_mc_socklist *pmc;
	struct in_device *in_dev;
	struct inet_sock *inet = inet_sk(sk);
	struct ip_sf_socklist *newpsl, *psl;
	struct net *net = sock_net(sk);
	int leavegroup = 0;

	if (!ipv4_is_multicast(addr))
		return -EINVAL;
	if (msf->imsf_fmode != MCAST_INCLUDE &&
	    msf->imsf_fmode != MCAST_EXCLUDE)
		return -EINVAL;

	ASSERT_RTNL();

	imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
	imr.imr_address.s_addr = msf->imsf_interface;
	imr.imr_ifindex = ifindex;
	in_dev = ip_mc_find_dev(net, &imr);

	if (!in_dev) {
		err = -ENODEV;
		goto done;
	}

	/* special case - (INCLUDE, empty) == LEAVE_GROUP */
	if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
		leavegroup = 1;
		goto done;
	}

	for_each_pmc_rtnl(inet, pmc) {
		if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
		    pmc->multi.imr_ifindex == imr.imr_ifindex)
			break;
	}
	if (!pmc) {		/* must have a prior join */
		err = -EINVAL;
		goto done;
	}
	if (msf->imsf_numsrc) {
		newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
							   GFP_KERNEL);
		if (!newpsl) {
			err = -ENOBUFS;
			goto done;
		}
		newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
		memcpy(newpsl->sl_addr, msf->imsf_slist,
			msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
		err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
			msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
		if (err) {
			sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
			goto done;
		}
	} else {
		newpsl = NULL;
		(void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
				     msf->imsf_fmode, 0, NULL, 0);
	}
	psl = rtnl_dereference(pmc->sflist);
	if (psl) {
		(void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
			psl->sl_count, psl->sl_addr, 0);
		/* decrease mem now to avoid the memleak warning */
		atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
		kfree_rcu(psl, rcu);
	} else
		(void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
			0, NULL, 0);
	rcu_assign_pointer(pmc->sflist, newpsl);
	pmc->sfmode = msf->imsf_fmode;
	err = 0;
done:
	if (leavegroup)
		err = ip_mc_leave_group(sk, &imr);
	return err;
}

int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
	struct ip_msfilter __user *optval, int __user *optlen)
{
	int err, len, count, copycount;
	struct ip_mreqn	imr;
	__be32 addr = msf->imsf_multiaddr;
	struct ip_mc_socklist *pmc;
	struct in_device *in_dev;
	struct inet_sock *inet = inet_sk(sk);
	struct ip_sf_socklist *psl;
	struct net *net = sock_net(sk);

	ASSERT_RTNL();

	if (!ipv4_is_multicast(addr))
		return -EINVAL;

	imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
	imr.imr_address.s_addr = msf->imsf_interface;
	imr.imr_ifindex = 0;
	in_dev = ip_mc_find_dev(net, &imr);

	if (!in_dev) {
		err = -ENODEV;
		goto done;
	}
	err = -EADDRNOTAVAIL;

	for_each_pmc_rtnl(inet, pmc) {
		if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
		    pmc->multi.imr_ifindex == imr.imr_ifindex)
			break;
	}
	if (!pmc)		/* must have a prior join */
		goto done;
	msf->imsf_fmode = pmc->sfmode;
	psl = rtnl_dereference(pmc->sflist);
	if (!psl) {
		len = 0;
		count = 0;
	} else {
		count = psl->sl_count;
	}
	copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
	len = copycount * sizeof(psl->sl_addr[0]);
	msf->imsf_numsrc = count;
	if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
	    copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
		return -EFAULT;
	}
	if (len &&
	    copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
		return -EFAULT;
	return 0;
done:
	return err;
}

int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
	struct group_filter __user *optval, int __user *optlen)
{
	int err, i, count, copycount;
	struct sockaddr_in *psin;
	__be32 addr;
	struct ip_mc_socklist *pmc;
	struct inet_sock *inet = inet_sk(sk);
	struct ip_sf_socklist *psl;

	ASSERT_RTNL();

	psin = (struct sockaddr_in *)&gsf->gf_group;
	if (psin->sin_family != AF_INET)
		return -EINVAL;
	addr = psin->sin_addr.s_addr;
	if (!ipv4_is_multicast(addr))
		return -EINVAL;

	err = -EADDRNOTAVAIL;

	for_each_pmc_rtnl(inet, pmc) {
		if (pmc->multi.imr_multiaddr.s_addr == addr &&
		    pmc->multi.imr_ifindex == gsf->gf_interface)
			break;
	}
	if (!pmc)		/* must have a prior join */
		goto done;
	gsf->gf_fmode = pmc->sfmode;
	psl = rtnl_dereference(pmc->sflist);
	count = psl ? psl->sl_count : 0;
	copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
	gsf->gf_numsrc = count;
	if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
	    copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
		return -EFAULT;
	}
	for (i = 0; i < copycount; i++) {
		struct sockaddr_storage ss;

		psin = (struct sockaddr_in *)&ss;
		memset(&ss, 0, sizeof(ss));
		psin->sin_family = AF_INET;
		psin->sin_addr.s_addr = psl->sl_addr[i];
		if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
			return -EFAULT;
	}
	return 0;
done:
	return err;
}

/*
 * check if a multicast source filter allows delivery for a given <src,dst,intf>
 */
int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr,
		   int dif, int sdif)
{
	struct inet_sock *inet = inet_sk(sk);
	struct ip_mc_socklist *pmc;
	struct ip_sf_socklist *psl;
	int i;
	int ret;

	ret = 1;
	if (!ipv4_is_multicast(loc_addr))
		goto out;

	rcu_read_lock();
	for_each_pmc_rcu(inet, pmc) {
		if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
		    (pmc->multi.imr_ifindex == dif ||
		     (sdif && pmc->multi.imr_ifindex == sdif)))
			break;
	}
	ret = inet->mc_all;
	if (!pmc)
		goto unlock;
	psl = rcu_dereference(pmc->sflist);
	ret = (pmc->sfmode == MCAST_EXCLUDE);
	if (!psl)
		goto unlock;

	for (i = 0; i < psl->sl_count; i++) {
		if (psl->sl_addr[i] == rmt_addr)
			break;
	}
	ret = 0;
	if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
		goto unlock;
	if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
		goto unlock;
	ret = 1;
unlock:
	rcu_read_unlock();
out:
	return ret;
}

/*
 *	A socket is closing.
 */

void ip_mc_drop_socket(struct sock *sk)
{
	struct inet_sock *inet = inet_sk(sk);
	struct ip_mc_socklist *iml;
	struct net *net = sock_net(sk);

	if (!inet->mc_list)
		return;

	rtnl_lock();
	while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
		struct in_device *in_dev;

		inet->mc_list = iml->next_rcu;
		in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
		(void) ip_mc_leave_src(sk, iml, in_dev);
		if (in_dev)
			ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
		/* decrease mem now to avoid the memleak warning */
		atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
		kfree_rcu(iml, rcu);
	}
	rtnl_unlock();
}

/* called with rcu_read_lock() */
int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u8 proto)
{
	struct ip_mc_list *im;
	struct ip_mc_list __rcu **mc_hash;
	struct ip_sf_list *psf;
	int rv = 0;

	mc_hash = rcu_dereference(in_dev->mc_hash);
	if (mc_hash) {
		u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG);

		for (im = rcu_dereference(mc_hash[hash]);
		     im != NULL;
		     im = rcu_dereference(im->next_hash)) {
			if (im->multiaddr == mc_addr)
				break;
		}
	} else {
		for_each_pmc_rcu(in_dev, im) {
			if (im->multiaddr == mc_addr)
				break;
		}
	}
	if (im && proto == IPPROTO_IGMP) {
		rv = 1;
	} else if (im) {
		if (src_addr) {
			for (psf = im->sources; psf; psf = psf->sf_next) {
				if (psf->sf_inaddr == src_addr)
					break;
			}
			if (psf)
				rv = psf->sf_count[MCAST_INCLUDE] ||
					psf->sf_count[MCAST_EXCLUDE] !=
					im->sfcount[MCAST_EXCLUDE];
			else
				rv = im->sfcount[MCAST_EXCLUDE] != 0;
		} else
			rv = 1; /* unspecified source; tentatively allow */
	}
	return rv;
}

#if defined(CONFIG_PROC_FS)
struct igmp_mc_iter_state {
	struct seq_net_private p;
	struct net_device *dev;
	struct in_device *in_dev;
};

#define	igmp_mc_seq_private(seq)	((struct igmp_mc_iter_state *)(seq)->private)

static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
{
	struct net *net = seq_file_net(seq);
	struct ip_mc_list *im = NULL;
	struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);

	state->in_dev = NULL;
	for_each_netdev_rcu(net, state->dev) {
		struct in_device *in_dev;

		in_dev = __in_dev_get_rcu(state->dev);
		if (!in_dev)
			continue;
		im = rcu_dereference(in_dev->mc_list);
		if (im) {
			state->in_dev = in_dev;
			break;
		}
	}
	return im;
}

static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
{
	struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);

	im = rcu_dereference(im->next_rcu);
	while (!im) {
		state->dev = next_net_device_rcu(state->dev);
		if (!state->dev) {
			state->in_dev = NULL;
			break;
		}
		state->in_dev = __in_dev_get_rcu(state->dev);
		if (!state->in_dev)
			continue;
		im = rcu_dereference(state->in_dev->mc_list);
	}
	return im;
}

static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
{
	struct ip_mc_list *im = igmp_mc_get_first(seq);
	if (im)
		while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
			--pos;
	return pos ? NULL : im;
}

static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
	__acquires(rcu)
{
	rcu_read_lock();
	return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
}

static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
	struct ip_mc_list *im;
	if (v == SEQ_START_TOKEN)
		im = igmp_mc_get_first(seq);
	else
		im = igmp_mc_get_next(seq, v);
	++*pos;
	return im;
}

static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
	__releases(rcu)
{
	struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);

	state->in_dev = NULL;
	state->dev = NULL;
	rcu_read_unlock();
}

static int igmp_mc_seq_show(struct seq_file *seq, void *v)
{
	if (v == SEQ_START_TOKEN)
		seq_puts(seq,
			 "Idx\tDevice    : Count Querier\tGroup    Users Timer\tReporter\n");
	else {
		struct ip_mc_list *im = (struct ip_mc_list *)v;
		struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
		char   *querier;
		long delta;

#ifdef CONFIG_IP_MULTICAST
		querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
			  IGMP_V2_SEEN(state->in_dev) ? "V2" :
			  "V3";
#else
		querier = "NONE";
#endif

		if (rcu_access_pointer(state->in_dev->mc_list) == im) {
			seq_printf(seq, "%d\t%-10s: %5d %7s\n",
				   state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
		}

		delta = im->timer.expires - jiffies;
		seq_printf(seq,
			   "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
			   im->multiaddr, im->users,
			   im->tm_running,
			   im->tm_running ? jiffies_delta_to_clock_t(delta) : 0,
			   im->reporter);
	}
	return 0;
}

static const struct seq_operations igmp_mc_seq_ops = {
	.start	=	igmp_mc_seq_start,
	.next	=	igmp_mc_seq_next,
	.stop	=	igmp_mc_seq_stop,
	.show	=	igmp_mc_seq_show,
};

static int igmp_mc_seq_open(struct inode *inode, struct file *file)
{
	return seq_open_net(inode, file, &igmp_mc_seq_ops,
			sizeof(struct igmp_mc_iter_state));
}

static const struct file_operations igmp_mc_seq_fops = {
	.owner		=	THIS_MODULE,
	.open		=	igmp_mc_seq_open,
	.read		=	seq_read,
	.llseek		=	seq_lseek,
	.release	=	seq_release_net,
};

struct igmp_mcf_iter_state {
	struct seq_net_private p;
	struct net_device *dev;
	struct in_device *idev;
	struct ip_mc_list *im;
};

#define igmp_mcf_seq_private(seq)	((struct igmp_mcf_iter_state *)(seq)->private)

static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
{
	struct net *net = seq_file_net(seq);
	struct ip_sf_list *psf = NULL;
	struct ip_mc_list *im = NULL;
	struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);

	state->idev = NULL;
	state->im = NULL;
	for_each_netdev_rcu(net, state->dev) {
		struct in_device *idev;
		idev = __in_dev_get_rcu(state->dev);
		if (unlikely(!idev))
			continue;
		im = rcu_dereference(idev->mc_list);
		if (likely(im)) {
			spin_lock_bh(&im->lock);
			psf = im->sources;
			if (likely(psf)) {
				state->im = im;
				state->idev = idev;
				break;
			}
			spin_unlock_bh(&im->lock);
		}
	}
	return psf;
}

static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
{
	struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);

	psf = psf->sf_next;
	while (!psf) {
		spin_unlock_bh(&state->im->lock);
		state->im = state->im->next;
		while (!state->im) {
			state->dev = next_net_device_rcu(state->dev);
			if (!state->dev) {
				state->idev = NULL;
				goto out;
			}
			state->idev = __in_dev_get_rcu(state->dev);
			if (!state->idev)
				continue;
			state->im = rcu_dereference(state->idev->mc_list);
		}
		if (!state->im)
			break;
		spin_lock_bh(&state->im->lock);
		psf = state->im->sources;
	}
out:
	return psf;
}

static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
{
	struct ip_sf_list *psf = igmp_mcf_get_first(seq);
	if (psf)
		while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
			--pos;
	return pos ? NULL : psf;
}

static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
	__acquires(rcu)
{
	rcu_read_lock();
	return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
}

static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
	struct ip_sf_list *psf;
	if (v == SEQ_START_TOKEN)
		psf = igmp_mcf_get_first(seq);
	else
		psf = igmp_mcf_get_next(seq, v);
	++*pos;
	return psf;
}

static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
	__releases(rcu)
{
	struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
	if (likely(state->im)) {
		spin_unlock_bh(&state->im->lock);
		state->im = NULL;
	}
	state->idev = NULL;
	state->dev = NULL;
	rcu_read_unlock();
}

static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
{
	struct ip_sf_list *psf = (struct ip_sf_list *)v;
	struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);

	if (v == SEQ_START_TOKEN) {
		seq_puts(seq, "Idx Device        MCA        SRC    INC    EXC\n");
	} else {
		seq_printf(seq,
			   "%3d %6.6s 0x%08x "
			   "0x%08x %6lu %6lu\n",
			   state->dev->ifindex, state->dev->name,
			   ntohl(state->im->multiaddr),
			   ntohl(psf->sf_inaddr),
			   psf->sf_count[MCAST_INCLUDE],
			   psf->sf_count[MCAST_EXCLUDE]);
	}
	return 0;
}

static const struct seq_operations igmp_mcf_seq_ops = {
	.start	=	igmp_mcf_seq_start,
	.next	=	igmp_mcf_seq_next,
	.stop	=	igmp_mcf_seq_stop,
	.show	=	igmp_mcf_seq_show,
};

static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
{
	return seq_open_net(inode, file, &igmp_mcf_seq_ops,
			sizeof(struct igmp_mcf_iter_state));
}

static const struct file_operations igmp_mcf_seq_fops = {
	.owner		=	THIS_MODULE,
	.open		=	igmp_mcf_seq_open,
	.read		=	seq_read,
	.llseek		=	seq_lseek,
	.release	=	seq_release_net,
};

static int __net_init igmp_net_init(struct net *net)
{
	struct proc_dir_entry *pde;
	int err;

	pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops);
	if (!pde)
		goto out_igmp;
	pde = proc_create("mcfilter", S_IRUGO, net->proc_net,
			  &igmp_mcf_seq_fops);
	if (!pde)
		goto out_mcfilter;
	err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET,
				   SOCK_DGRAM, 0, net);
	if (err < 0) {
		pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n",
		       err);
		goto out_sock;
	}

	return 0;

out_sock:
	remove_proc_entry("mcfilter", net->proc_net);
out_mcfilter:
	remove_proc_entry("igmp", net->proc_net);
out_igmp:
	return -ENOMEM;
}

static void __net_exit igmp_net_exit(struct net *net)
{
	remove_proc_entry("mcfilter", net->proc_net);
	remove_proc_entry("igmp", net->proc_net);
	inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk);
}

static struct pernet_operations igmp_net_ops = {
	.init = igmp_net_init,
	.exit = igmp_net_exit,
};
#endif

static int igmp_netdev_event(struct notifier_block *this,
			     unsigned long event, void *ptr)
{
	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
	struct in_device *in_dev;

	switch (event) {
	case NETDEV_RESEND_IGMP:
		in_dev = __in_dev_get_rtnl(dev);
		if (in_dev)
			ip_mc_rejoin_groups(in_dev);
		break;
	default:
		break;
	}
	return NOTIFY_DONE;
}

static struct notifier_block igmp_notifier = {
	.notifier_call = igmp_netdev_event,
};

int __init igmp_mc_init(void)
{
#if defined(CONFIG_PROC_FS)
	int err;

	err = register_pernet_subsys(&igmp_net_ops);
	if (err)
		return err;
	err = register_netdevice_notifier(&igmp_notifier);
	if (err)
		goto reg_notif_fail;
	return 0;

reg_notif_fail:
	unregister_pernet_subsys(&igmp_net_ops);
	return err;
#else
	return register_netdevice_notifier(&igmp_notifier);
#endif
}