Wade Guthrie | 0d43853 | 2012-05-18 14:18:50 -0700 | [diff] [blame] | 1 | // Copyright (c) 2012 The Chromium OS Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #include "shill/kernel_bound_nlmessage.h" |
| 6 | |
| 7 | #include <net/if.h> |
| 8 | #include <netlink/genl/genl.h> |
| 9 | #include <netlink/msg.h> |
| 10 | #include <netlink/netlink.h> |
| 11 | |
| 12 | #include <base/logging.h> |
| 13 | |
| 14 | #include "shill/logging.h" |
| 15 | #include "shill/netlink_socket.h" |
| 16 | #include "shill/scope_logger.h" |
| 17 | |
| 18 | namespace shill { |
| 19 | |
| 20 | const uint32_t KernelBoundNlMessage::kIllegalMessage = 0xFFFFFFFF; |
| 21 | |
| 22 | KernelBoundNlMessage::~KernelBoundNlMessage() { |
| 23 | if (message_) { |
| 24 | nlmsg_free(message_); |
| 25 | message_ = NULL; |
| 26 | } |
| 27 | } |
| 28 | |
| 29 | bool KernelBoundNlMessage::Init() { |
| 30 | message_ = nlmsg_alloc(); |
| 31 | |
| 32 | if (!message_) { |
| 33 | LOG(ERROR) << "Couldn't allocate |message_|"; |
| 34 | return false; |
| 35 | } |
| 36 | |
| 37 | return true; |
| 38 | } |
| 39 | |
| 40 | uint32_t KernelBoundNlMessage::GetId() const { |
| 41 | if (!message_) { |
| 42 | LOG(ERROR) << "NULL |message_|"; |
| 43 | return kIllegalMessage; |
| 44 | } |
| 45 | struct nlmsghdr *header = nlmsg_hdr(message_); |
| 46 | if (!header) { |
| 47 | LOG(ERROR) << "Couldn't make header"; |
| 48 | return kIllegalMessage; |
| 49 | } |
| 50 | return header->nlmsg_seq; |
| 51 | } |
| 52 | |
| 53 | bool KernelBoundNlMessage::AddNetlinkHeader(uint32_t port, uint32_t seq, |
| 54 | int family_id, int hdrlen, |
| 55 | int flags, uint8_t cmd, |
| 56 | uint8_t version) { |
| 57 | if (!message_) { |
| 58 | LOG(ERROR) << "NULL |message_|"; |
| 59 | return false; |
| 60 | } |
| 61 | |
| 62 | // Parameters to genlmsg_put: |
| 63 | // @message: struct nl_msg *message_. |
| 64 | // @pid: netlink pid the message is addressed to. |
| 65 | // @seq: sequence number (usually the one of the sender). |
| 66 | // @family: generic netlink family. |
| 67 | // @flags netlink message flags. |
| 68 | // @cmd: netlink command. |
| 69 | // @version: version of communication protocol. |
| 70 | // genlmsg_put returns a void * pointing to the header but we don't want to |
| 71 | // encourage its use outside of this object. |
| 72 | |
| 73 | if (genlmsg_put(message_, port, seq, family_id, hdrlen, flags, cmd, version) |
| 74 | == NULL) { |
| 75 | LOG(ERROR) << "genlmsg_put returned a NULL pointer."; |
| 76 | return false; |
| 77 | } |
| 78 | |
| 79 | return true; |
| 80 | } |
| 81 | |
| 82 | int KernelBoundNlMessage::AddAttribute(int attrtype, int attrlen, |
| 83 | const void *data) { |
| 84 | if (!data) { |
| 85 | LOG(ERROR) << "NULL |data| parameter"; |
| 86 | return -1; |
| 87 | } |
| 88 | if (!message_) { |
| 89 | LOG(ERROR) << "NULL |message_|."; |
| 90 | return -1; |
| 91 | } |
| 92 | return nla_put(message_, attrtype, attrlen, data); |
| 93 | } |
| 94 | |
| 95 | bool KernelBoundNlMessage::Send(NetlinkSocket *socket) { |
| 96 | if (!socket) { |
| 97 | LOG(ERROR) << "NULL |socket| parameter"; |
| 98 | return false; |
| 99 | } |
| 100 | if (!message_) { |
| 101 | LOG(ERROR) << "NULL |message_|."; |
| 102 | return -1; |
| 103 | } |
| 104 | |
| 105 | // Manually set the sequence number -- seems to work. |
| 106 | struct nlmsghdr *header = nlmsg_hdr(message_); |
| 107 | if (header != 0) { |
| 108 | header->nlmsg_seq = socket->GetSequenceNumber(); |
| 109 | } |
| 110 | |
| 111 | // Complete AND SEND a message. |
| 112 | int result = nl_send_auto_complete( |
| 113 | const_cast<struct nl_sock *>(socket->GetConstNlSock()), message_); |
| 114 | |
| 115 | SLOG(WiFi, 6) << "NL Message " << GetId() << " ===>"; |
| 116 | |
| 117 | if (result < 0) { |
| 118 | LOG(ERROR) << "Failed call to 'nl_send_auto_complete': " << result; |
| 119 | return false; |
| 120 | } |
| 121 | return true; |
| 122 | } |
| 123 | |
| 124 | } // namespace shill. |