18d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt/* 28d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * WPA Supplicant - Layer2 packet handling with Linux packet sockets 38d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * Copyright (c) 2003-2005, Jouni Malinen <j@w1.fi> 48d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * 5c5ec7f57ead87efa365800228aa0b09a12d9e6c4Dmitry Shmidt * This software may be distributed under the terms of the BSD license. 6c5ec7f57ead87efa365800228aa0b09a12d9e6c4Dmitry Shmidt * See README for more details. 78d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt */ 88d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 98d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#include "includes.h" 108d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#include <sys/ioctl.h> 118d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#include <netpacket/packet.h> 128d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#include <net/if.h> 138d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 148d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#include "common.h" 158d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#include "eloop.h" 168d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt#include "l2_packet.h" 178d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 188d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 198d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstruct l2_packet_data { 208d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt int fd; /* packet socket for EAPOL frames */ 218d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt char ifname[IFNAMSIZ + 1]; 228d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt int ifindex; 238d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt u8 own_addr[ETH_ALEN]; 248d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt void (*rx_callback)(void *ctx, const u8 *src_addr, 258d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt const u8 *buf, size_t len); 268d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt void *rx_callback_ctx; 278d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt int l2_hdr; /* whether to include layer 2 (Ethernet) header data 288d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt * buffers */ 298d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt}; 308d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 318d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 328d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtint l2_packet_get_own_addr(struct l2_packet_data *l2, u8 *addr) 338d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 348d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt os_memcpy(addr, l2->own_addr, ETH_ALEN); 358d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return 0; 368d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 378d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 388d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 398d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtint l2_packet_send(struct l2_packet_data *l2, const u8 *dst_addr, u16 proto, 408d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt const u8 *buf, size_t len) 418d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 428d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt int ret; 438d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (l2 == NULL) 448d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return -1; 458d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (l2->l2_hdr) { 468d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ret = send(l2->fd, buf, len, 0); 478d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (ret < 0) 488d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpa_printf(MSG_ERROR, "l2_packet_send - send: %s", 498d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt strerror(errno)); 508d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } else { 518d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct sockaddr_ll ll; 528d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt os_memset(&ll, 0, sizeof(ll)); 538d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ll.sll_family = AF_PACKET; 548d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ll.sll_ifindex = l2->ifindex; 558d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ll.sll_protocol = htons(proto); 568d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ll.sll_halen = ETH_ALEN; 578d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt os_memcpy(ll.sll_addr, dst_addr, ETH_ALEN); 588d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ret = sendto(l2->fd, buf, len, 0, (struct sockaddr *) &ll, 598d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt sizeof(ll)); 608d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (ret < 0) { 618d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpa_printf(MSG_ERROR, "l2_packet_send - sendto: %s", 628d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt strerror(errno)); 638d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 648d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 658d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return ret; 668d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 678d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 688d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 698d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstatic void l2_packet_receive(int sock, void *eloop_ctx, void *sock_ctx) 708d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 718d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct l2_packet_data *l2 = eloop_ctx; 728d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt u8 buf[2300]; 738d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt int res; 748d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct sockaddr_ll ll; 758d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt socklen_t fromlen; 768d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 778d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt os_memset(&ll, 0, sizeof(ll)); 788d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt fromlen = sizeof(ll); 798d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt res = recvfrom(sock, buf, sizeof(buf), 0, (struct sockaddr *) &ll, 808d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt &fromlen); 818d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (res < 0) { 828d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpa_printf(MSG_DEBUG, "l2_packet_receive - recvfrom: %s", 838d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt strerror(errno)); 848d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return; 858d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 868d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 878d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt l2->rx_callback(l2->rx_callback_ctx, ll.sll_addr, buf, res); 888d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 898d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 908d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 918d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtstruct l2_packet_data * l2_packet_init( 928d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt const char *ifname, const u8 *own_addr, unsigned short protocol, 938d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt void (*rx_callback)(void *ctx, const u8 *src_addr, 948d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt const u8 *buf, size_t len), 958d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt void *rx_callback_ctx, int l2_hdr) 968d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 978d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct l2_packet_data *l2; 988d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct ifreq ifr; 998d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct sockaddr_ll ll; 1008d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 1018d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt l2 = os_zalloc(sizeof(struct l2_packet_data)); 1028d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (l2 == NULL) 1038d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return NULL; 1048d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt os_strlcpy(l2->ifname, ifname, sizeof(l2->ifname)); 1058d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt l2->rx_callback = rx_callback; 1068d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt l2->rx_callback_ctx = rx_callback_ctx; 1078d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt l2->l2_hdr = l2_hdr; 1088d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 1098d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt l2->fd = socket(PF_PACKET, l2_hdr ? SOCK_RAW : SOCK_DGRAM, 1108d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt htons(protocol)); 1118d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (l2->fd < 0) { 1128d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpa_printf(MSG_ERROR, "%s: socket(PF_PACKET): %s", 1138d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt __func__, strerror(errno)); 1148d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt os_free(l2); 1158d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return NULL; 1168d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 1178d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt os_memset(&ifr, 0, sizeof(ifr)); 1188d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt os_strlcpy(ifr.ifr_name, l2->ifname, sizeof(ifr.ifr_name)); 1198d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (ioctl(l2->fd, SIOCGIFINDEX, &ifr) < 0) { 1208d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpa_printf(MSG_ERROR, "%s: ioctl[SIOCGIFINDEX]: %s", 1218d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt __func__, strerror(errno)); 1228d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt close(l2->fd); 1238d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt os_free(l2); 1248d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return NULL; 1258d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 1268d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt l2->ifindex = ifr.ifr_ifindex; 1278d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 1288d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt os_memset(&ll, 0, sizeof(ll)); 1298d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ll.sll_family = PF_PACKET; 1308d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ll.sll_ifindex = ifr.ifr_ifindex; 1318d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt ll.sll_protocol = htons(protocol); 1328d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (bind(l2->fd, (struct sockaddr *) &ll, sizeof(ll)) < 0) { 1338d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpa_printf(MSG_ERROR, "%s: bind[PF_PACKET]: %s", 1348d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt __func__, strerror(errno)); 1358d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt close(l2->fd); 1368d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt os_free(l2); 1378d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return NULL; 1388d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 1398d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 1408d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (ioctl(l2->fd, SIOCGIFHWADDR, &ifr) < 0) { 1418d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpa_printf(MSG_ERROR, "%s: ioctl[SIOCGIFHWADDR]: %s", 1428d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt __func__, strerror(errno)); 1438d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt close(l2->fd); 1448d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt os_free(l2); 1458d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return NULL; 1468d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 1478d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt os_memcpy(l2->own_addr, ifr.ifr_hwaddr.sa_data, ETH_ALEN); 1488d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 1498d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt eloop_register_read_sock(l2->fd, l2_packet_receive, l2, NULL); 1508d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 1518d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return l2; 1528d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 1538d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 1548d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 1558d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtvoid l2_packet_deinit(struct l2_packet_data *l2) 1568d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 1578d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (l2 == NULL) 1588d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return; 1598d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 1608d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (l2->fd >= 0) { 1618d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt eloop_unregister_read_sock(l2->fd); 1628d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt close(l2->fd); 1638d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 1648d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 1658d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt os_free(l2); 1668d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 1678d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 1688d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 1698d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtint l2_packet_get_ip_addr(struct l2_packet_data *l2, char *buf, size_t len) 1708d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 1718d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt int s; 1728d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct ifreq ifr; 1738d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt struct sockaddr_in *saddr; 1748d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt size_t res; 1758d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 1768d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt s = socket(PF_INET, SOCK_DGRAM, 0); 1778d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (s < 0) { 1788d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpa_printf(MSG_ERROR, "%s: socket: %s", 1798d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt __func__, strerror(errno)); 1808d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return -1; 1818d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 1828d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt os_memset(&ifr, 0, sizeof(ifr)); 1838d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt os_strlcpy(ifr.ifr_name, l2->ifname, sizeof(ifr.ifr_name)); 1848d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (ioctl(s, SIOCGIFADDR, &ifr) < 0) { 1858d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (errno != EADDRNOTAVAIL) 1868d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt wpa_printf(MSG_ERROR, "%s: ioctl[SIOCGIFADDR]: %s", 1878d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt __func__, strerror(errno)); 1888d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt close(s); 1898d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return -1; 1908d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt } 1918d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt close(s); 1928d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt saddr = aliasing_hide_typecast(&ifr.ifr_addr, struct sockaddr_in); 1938d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (saddr->sin_family != AF_INET) 1948d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return -1; 1958d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt res = os_strlcpy(buf, inet_ntoa(saddr->sin_addr), len); 1968d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt if (res >= len) 1978d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return -1; 1988d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt return 0; 1998d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 2008d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 2018d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt 2028d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidtvoid l2_packet_notify_auth_start(struct l2_packet_data *l2) 2038d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt{ 2048d520ff1dc2da35cdca849e982051b86468016d8Dmitry Shmidt} 205