87 lines
2.4 KiB
Diff
87 lines
2.4 KiB
Diff
--- a/networking/udhcp/dhcpc.c
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+++ b/networking/udhcp/dhcpc.c
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@@ -26,8 +26,8 @@
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#include "dhcpc.h"
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#include <netinet/if_ether.h>
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-#include <netpacket/packet.h>
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#include <linux/filter.h>
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+#include <linux/if_packet.h>
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/* struct client_config_t client_config is in bb_common_bufsiz1 */
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@@ -846,17 +846,41 @@ static int send_release(uint32_t server,
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static NOINLINE int udhcp_recv_raw_packet(struct dhcp_packet *dhcp_pkt, int fd)
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{
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int bytes;
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+ int nocsum = 0;
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struct ip_udp_dhcp_packet packet;
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uint16_t check;
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+ unsigned char cmsgbuf[CMSG_LEN(sizeof(struct tpacket_auxdata))];
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+ struct iovec iov = {
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+ .iov_base = &packet,
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+ .iov_len = sizeof(packet),
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+ };
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+ struct msghdr msg = {
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+ .msg_iov = &iov,
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+ .msg_iovlen = 1,
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+ .msg_control = cmsgbuf,
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+ .msg_controllen = sizeof(cmsgbuf),
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+ };
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+ struct cmsghdr *cmsg;
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memset(&packet, 0, sizeof(packet));
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- bytes = safe_read(fd, &packet, sizeof(packet));
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+ do {
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+ bytes = recvmsg(fd, &msg, 0);
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+ } while (bytes < 0 && errno == EINTR);
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+
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if (bytes < 0) {
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log1("Packet read error, ignoring");
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/* NB: possible down interface, etc. Caller should pause. */
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return bytes; /* returns -1 */
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}
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+ for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
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+ if (cmsg->cmsg_level == SOL_PACKET &&
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+ cmsg->cmsg_type == PACKET_AUXDATA) {
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+ struct tpacket_auxdata *aux = (void *)CMSG_DATA(cmsg);
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+ nocsum = aux->tp_status & TP_STATUS_CSUMNOTREADY;
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+ }
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+ }
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+
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if (bytes < (int) (sizeof(packet.ip) + sizeof(packet.udp))) {
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log1("Packet is too short, ignoring");
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return -2;
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@@ -896,7 +920,7 @@ static NOINLINE int udhcp_recv_raw_packe
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packet.ip.tot_len = packet.udp.len; /* yes, this is needed */
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check = packet.udp.check;
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packet.udp.check = 0;
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- if (check && check != udhcp_checksum(&packet, bytes)) {
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+ if (!nocsum && check && check != udhcp_checksum(&packet, bytes)) {
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log1("Packet with bad UDP checksum received, ignoring");
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return -2;
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}
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@@ -942,6 +966,7 @@ static int udhcp_raw_socket(int ifindex)
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{
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int fd;
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struct sockaddr_ll sock;
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+ int val;
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/*
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* Comment:
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@@ -1008,6 +1033,13 @@ static int udhcp_raw_socket(int ifindex)
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log1("Attached filter to raw socket fd %d", fd); // log?
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}
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+ val = 1;
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+ if (setsockopt(fd, SOL_PACKET, PACKET_AUXDATA, &val,
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+ sizeof(val)) < 0) {
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+ if (errno != ENOPROTOOPT)
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+ log1("Failed to set auxiliary packet data for socket fd %d", fd);
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+ }
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+
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log1("Created raw socket");
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return fd;
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