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check the length of IPv4 packet info control messages, add log message (#3920)

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Marten Seemann 2023-07-01 12:03:00 -07:00 • committed by GitHub
parent 0662afba63
commit fd0c9bbf9e
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4 changed files with 66 additions and 19 deletions
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14
sys_conn_helper_linux.go
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@ -3,6 +3,8 @@
package quic
import (
"encoding/binary"
"net/netip"
"syscall"
"golang.org/x/sys/unix"
@ -34,3 +36,15 @@ func forceSetSendBuffer(c syscall.RawConn, bytes int) error {
}
return serr
}
func parseIPv4PktInfo(body []byte) (ip netip.Addr, ifIndex uint32, ok bool) {
// struct in_pktinfo {
// unsigned int ipi_ifindex; /* Interface index */
// struct in_addr ipi_spec_dst; /* Local address */
// struct in_addr ipi_addr; /* Header Destination address */
// };
if len(body) != 12 {
return netip.Addr{}, 0, false
}
return netip.AddrFrom4(*(*[4]byte)(body[8:12])), binary.LittleEndian.Uint32(body), true
}