/* * netsniff-ng - the packet sniffing beast * Copyright 2012 Daniel Borkmann. * Subject to the GPL, version 2. * Parts derived from iw, subject to ISC license. * Copyright 2007, 2008 Johannes Berg * Copyright 2007 Andy Lutomirski * Copyright 2007 Mike Kershaw * Copyright 2008-2009 Luis R. Rodriguez */ #define _GNU_SOURCE #include #include #include #include #include #include #include #include #include #include #include #include #include #include "die.h" #include "str.h" #include "dev.h" #include "mac80211.h" #include "xmalloc.h" #include "built_in.h" struct nl80211_state { struct nl_sock *nl_sock; struct nl_cache *nl_cache; struct genl_family *nl80211; }; static void get_mac80211_phydev(const char *device, char *phydev_path, size_t phydev_len) { int ret; char *pathstr; ssize_t num; ret = asprintf(&pathstr, "/sys/class/net/%s/phy80211", device); if (ret < 0) panic("Can't generate path name string for /sys/class/net device"); num = readlink(pathstr, phydev_path, phydev_len); if (num < 0) { if (errno == ENOENT || errno == EINVAL) panic("It's probably not a mac80211 device!\n"); panic("Can't readlink %s: %s!\n", pathstr, strerror(errno)); } xfree(pathstr); phydev_path[min(num, phydev_len - 1)] = 0; } static inline struct nl_msg *nl80211_nlmsg_xalloc(void) { struct nl_msg *ret = nlmsg_alloc(); if (!ret) panic("Cannot allocate nlmsg memory!\n"); return ret; } static inline struct nl_sock *nl80211_nl_socket_xalloc(void) { struct nl_sock *ret = nl_socket_alloc(); if (!ret) panic("Cannot allocate nl socket memory!\n"); return ret; } static void nl80211_init(struct nl80211_state *state, const char *device) { int ret; state->nl_sock = nl80211_nl_socket_xalloc(); ret = genl_connect(state->nl_sock); if (ret) panic("Cannot connect generic netlink!\n"); ret = genl_ctrl_alloc_cache(state->nl_sock, &state->nl_cache); if (ret < 0) panic("Failed to allocate generic netlink cache: %s!", nl_geterror(-ret)); state->nl80211 = genl_ctrl_search_by_name(state->nl_cache, "nl80211"); if (!state->nl80211) panic("nl80211 not found in netlink cache!\n"); } static void nl80211_cleanup(struct nl80211_state *state) { genl_family_put(state->nl80211); nl_cache_free(state->nl_cache); nl_socket_free(state->nl_sock); } static int nl80211_wait_handler(struct nl_msg *msg, void *arg) { int *finished = arg; *finished = 1; return NL_STOP; } static int nl80211_error_handler(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg) { panic("nl80211 returned with error %d\n", err->error); } static int nl80211_add_mon_if(struct nl80211_state *state, const char *device, const char *mondevice) { int ifindex, ret; struct nl_msg *msg; struct nl_cb *cb = NULL; int finished = 0; ifindex = device_ifindex(device); msg = nl80211_nlmsg_xalloc(); genlmsg_put(msg, 0, 0, genl_family_get_id(state->nl80211), 0, 0, NL80211_CMD_NEW_INTERFACE, 0); NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, ifindex); NLA_PUT_STRING(msg, NL80211_ATTR_IFNAME, mondevice); NLA_PUT_U32(msg, NL80211_ATTR_IFTYPE, NL80211_IFTYPE_MONITOR); ret = nl_send_auto_complete(state->nl_sock, msg); if (ret < 0) { if (ret == -ENFILE) { nlmsg_free(msg); return -EBUSY; } panic("Cannot send_auto_complete!\n"); } cb = nl_cb_alloc(NL_CB_CUSTOM); if (!cb) panic("Cannot alloc nl_cb!\n"); nl_cb_set(cb, NL_CB_ACK, NL_CB_CUSTOM, nl80211_wait_handler, &finished); nl_cb_err(cb, NL_CB_CUSTOM, nl80211_error_handler, NULL); nl_recvmsgs(state->nl_sock, cb); if (!finished) { ret = nl_wait_for_ack(state->nl_sock); if (ret < 0) { if (ret == -ENFILE) { nlmsg_free(msg); return -EBUSY; } panic("Waiting for netlink ack failed!\n"); } } nl_cb_put(cb); nlmsg_free(msg); return 0; nla_put_failure: panic("nla put failure!\n"); return -EIO; /* dummy */ } static int nl80211_del_mon_if(struct nl80211_state *state, const char *device, const char *mondevice) { int ifindex, ret; struct nl_msg *msg; ifindex = device_ifindex(mondevice); msg = nl80211_nlmsg_xalloc(); genlmsg_put(msg, 0, 0, genl_family_get_id(state->nl80211), 0, 0, NL80211_CMD_DEL_INTERFACE, 0); NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, ifindex); ret = nl_send_auto_complete(state->nl_sock, msg); if (ret < 0) panic("Cannot send_auto_complete!\n"); ret = nl_wait_for_ack(state->nl_sock); if (ret < 0) panic("Waiting for netlink ack failed!\n"); nlmsg_free(msg); return 0; nla_put_failure: panic("nla put failure!\n"); return -EIO; /* dummy */ } void enter_rfmon_mac80211(const char *device, char **mondev) { int ret; short flags; uint32_t n; char phydev_path[256]; struct nl80211_state nlstate; /* XXX: is this already a monN device? */ get_mac80211_phydev(device, phydev_path, sizeof(phydev_path)); nl80211_init(&nlstate, device); for (n = 0; n < UINT_MAX; n++) { char mondevice[32]; slprintf(mondevice, sizeof(mondevice), "mon%u", n); ret = nl80211_add_mon_if(&nlstate, device, mondevice); if (ret == 0) { *mondev = xstrdup(mondevice); flags = device_get_flags(*mondev); flags |= IFF_UP | IFF_RUNNING; device_set_flags(*mondev, flags); nl80211_cleanup(&nlstate); return; } } panic("No free monN interfaces!\n"); } void leave_rfmon_mac80211(const char *device, const char *mondev) { short flags; struct nl80211_state nlstate; flags = device_get_flags(mondev); flags &= ~(IFF_UP | IFF_RUNNING); device_set_flags(mondev, flags); nl80211_init(&nlstate, device); nl80211_del_mon_if(&nlstate, device, mondev); nl80211_cleanup(&nlstate); } iJiri Pirko2-2/+2 2017-02-10sched: rename tcf_destroy to tcf_destroy_protoJiri Pirko1-1/+1 2017-02-10ipv4: fib: Add events for FIB replace and appendIdo Schimmel1-1/+2 2017-02-09openvswitch: Add force commit.Jarno Rajahalme1-0/+5 2017-02-09openvswitch: Add original direction conntrack tuple to sw_flow_key.Jarno Rajahalme1-1/+19 2017-02-09openvswitch: Unionize ovs_key_ct_label with a u32 array.Jarno Rajahalme1-2/+6 2017-02-09sctp: implement sender-side procedures for Add Incoming/Outgoing Streams Requ...Xin Long2-0/+9 2017-02-09sctp: add support for generating stream reconf add incoming/outgoing streams ...Xin Long2-0/+10 2017-02-09sctp: implement sender-side procedures for SSN/TSN Reset Request ParameterXin Long2-0/+2 2017-02-09sctp: add support for generating stream reconf ssn/tsn reset request chunkXin Long2-0/+7 2017-02-09sctp: drop unnecessary __packed from some stream reconf structuresXin Long1-3/+3 2017-02-08ipv4: fib: Notify about nexthop status changesIdo Schimmel1-0/+7 2017-02-08net: stmmac: Remove the bus_setup function pointerLABBE Corentin1-1/+0 2017-02-08gro_cells: move to net/core/gro_cells.cEric Dumazet1-82/+4 2017-02-08net: phy: Add LED mode driver for Microsemi PHYs.Raju Lakkaraju