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Add a separate translator for headers passed to the TCP probes in the

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input path. These probes get some of the fields in host order, whereas the
output probes get them in network order, so a single translator isn't
enough. This workaround ensures that the problem is essentially invisble
to users: none of the probe arguments or their fields have changed.

Approved by:	re (hrs)
This commit is contained in:
Mark Johnston 2013-10-02 17:14:12 +00:00
parent 5c4d5cc795
commit 8298c17c6c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=255993
2 changed files with 43 additions and 5 deletions
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40
cddl/lib/libdtrace/tcp.d
View File

@ -141,6 +141,25 @@ typedef struct tcpinfo {
struct tcphdr *tcp_hdr; /* raw TCP header */
} tcpinfo_t;
/*
* A clone of tcpinfo_t used to handle the fact that the TCP input path
* overwrites some fields of the TCP header with their host-order equivalents.
* Unfortunately, DTrace doesn't let us simply typedef a new name for struct
* tcpinfo and define a separate translator for it.
*/
typedef struct tcpinfoh {
uint16_t tcp_sport; /* source port */
uint16_t tcp_dport; /* destination port */
uint32_t tcp_seq; /* sequence number */
uint32_t tcp_ack; /* acknowledgment number */
uint8_t tcp_offset; /* data offset, in bytes */
uint8_t tcp_flags; /* flags */
uint16_t tcp_window; /* window size */
uint16_t tcp_checksum; /* checksum */
uint16_t tcp_urgent; /* urgent data pointer */
struct tcphdr *tcp_hdr; /* raw TCP header */
} tcpinfoh_t;
#pragma D binding "1.0" translator
translator csinfo_t < struct tcpcb *p > {
cs_addr = NULL;
@ -180,7 +199,7 @@ translator tcpsinfo_t < struct tcpcb *p > {
tcps_sack_snxt = p == NULL ? 0 : p->sack_newdata;
tcps_rto = p == NULL ? -1 : p->t_rxtcur / 1000; /* XXX */
tcps_mss = p == NULL ? -1 : p->t_maxseg;
tcps_retransmit = -1; /* XXX */
tcps_retransmit = p == NULL ? -1 : p->t_rxtshift > 0 ? 1 : 0;
};
#pragma D binding "1.0" translator
@ -197,6 +216,25 @@ translator tcpinfo_t < struct tcphdr *p > {
tcp_hdr = (struct tcphdr *)p;
};
/*
* This translator differs from the one for tcpinfo_t in that the sequence
* number, acknowledgement number, window size and urgent pointer are already
* in host order and thus don't need to be converted.
*/
#pragma D binding "1.0" translator
translator tcpinfoh_t < struct tcphdr *p > {
tcp_sport = p == NULL ? 0 : ntohs(p->th_sport);
tcp_dport = p == NULL ? 0 : ntohs(p->th_dport);
tcp_seq = p == NULL ? -1 : p->th_seq;
tcp_ack = p == NULL ? -1 : p->th_ack;
tcp_offset = p == NULL ? -1 : (p->th_off >> 2);
tcp_flags = p == NULL ? 0 : p->th_flags;
tcp_window = p == NULL ? 0 : (p->th_win);
tcp_checksum = p == NULL ? 0 : ntohs(p->th_sum);
tcp_urgent = p == NULL ? 0 : p->th_urp;
tcp_hdr = (struct tcphdr *)p;
};
#pragma D binding "1.0" translator
translator tcplsinfo_t < int s > {
tcps_state = s;

8
sys/netinet/in_kdtrace.c
View File

@ -60,7 +60,7 @@ SDT_PROBE_DEFINE5_XLATE(tcp, , , accept_established, accept-established,
"struct tcpcb *", "csinfo_t *",
"uint8_t *", "ipinfo_t *",
"struct tcpcb *", "tcpsinfo_t *" ,
"struct tcphdr *", "tcpinfo_t *");
"struct tcphdr *", "tcpinfoh_t *");
SDT_PROBE_DEFINE5_XLATE(tcp, , , accept_refused, accept-refused,
"void *", "pktinfo_t *",
@ -74,14 +74,14 @@ SDT_PROBE_DEFINE5_XLATE(tcp, , , connect_established, connect-established,
"struct tcpcb *", "csinfo_t *",
"uint8_t *", "ipinfo_t *",
"struct tcpcb *", "tcpsinfo_t *" ,
"struct tcphdr *", "tcpinfo_t *");
"struct tcphdr *", "tcpinfoh_t *");
SDT_PROBE_DEFINE5_XLATE(tcp, , , connect_refused, connect-refused,
"void *", "pktinfo_t *",
"struct tcpcb *", "csinfo_t *",
"uint8_t *", "ipinfo_t *",
"struct tcpcb *", "tcpsinfo_t *" ,
"struct tcphdr *", "tcpinfo_t *");
"struct tcphdr *", "tcpinfoh_t *");
SDT_PROBE_DEFINE5_XLATE(tcp, , , connect_request, connect-request,
"void *", "pktinfo_t *",
@ -95,7 +95,7 @@ SDT_PROBE_DEFINE5_XLATE(tcp, , , receive, receive,
"struct tcpcb *", "csinfo_t *",
"uint8_t *", "ipinfo_t *",
"struct tcpcb *", "tcpsinfo_t *" ,
"struct tcphdr *", "tcpinfo_t *");
"struct tcphdr *", "tcpinfoh_t *");
SDT_PROBE_DEFINE5_XLATE(tcp, , , send, send,
"void *", "pktinfo_t *",