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ss: allow dumping MPTCP subflow information

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[root@f31 packetdrill]# ss -tni

 ESTAB    0        0           192.168.82.247:8080           192.0.2.1:35273
          cubic wscale:7,8 [...] tcp-ulp-mptcp flags:Mec token:0000(id:0)/5f856c60(id:0) seq:b810457db34209a5 sfseq:1 ssnoff:0 maplen:190

Additionally extends ss manpage to describe the new entry layout.

Signed-off-by: Davide Caratti <dcaratti@redhat.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David Ahern <dsahern@gmail.com>
This commit is contained in:
Davide Caratti 2020-04-23 15:37:09 +02:00 committed by David Ahern
parent 7e0767cd86
commit 712fdd98c0
2 changed files with 67 additions and 0 deletions
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5
man/man8/ss.8
View File

@ -261,6 +261,11 @@ the pacing rate and max pacing rate
.TP
.B rcv_space:<rcv_space>
a helper variable for TCP internal auto tuning socket receive buffer
.P
.TP
.B tcp-ulp-mptcp flags:[MmBbJjecv] token:<rem_token(rem_id)/loc_token(loc_id)> seq:<sn> sfseq:<ssn> ssnoff:<off> maplen:<maplen>
MPTCP subflow information
.P
.RE
.TP
.B \-\-tos

62
misc/ss.c
View File

@ -53,6 +53,7 @@
#include <linux/tipc_netlink.h>
#include <linux/tipc_sockets_diag.h>
#include <linux/tls.h>
#include <linux/mptcp.h>
/* AF_VSOCK/PF_VSOCK is only provided since glibc 2.18 */
#ifndef PF_VSOCK
@ -2836,6 +2837,59 @@ static void tcp_tls_conf(const char *name, struct rtattr *attr)
}
}
static void mptcp_subflow_info(struct rtattr *tb[])
{
u_int32_t flags = 0;
if (tb[MPTCP_SUBFLOW_ATTR_FLAGS]) {
char caps[32 + 1] = { 0 }, *cap = &caps[0];
flags = rta_getattr_u32(tb[MPTCP_SUBFLOW_ATTR_FLAGS]);
if (flags & MPTCP_SUBFLOW_FLAG_MCAP_REM)
*cap++ = 'M';
if (flags & MPTCP_SUBFLOW_FLAG_MCAP_LOC)
*cap++ = 'm';
if (flags & MPTCP_SUBFLOW_FLAG_JOIN_REM)
*cap++ = 'J';
if (flags & MPTCP_SUBFLOW_FLAG_JOIN_LOC)
*cap++ = 'j';
if (flags & MPTCP_SUBFLOW_FLAG_BKUP_REM)
*cap++ = 'B';
if (flags & MPTCP_SUBFLOW_FLAG_BKUP_LOC)
*cap++ = 'b';
if (flags & MPTCP_SUBFLOW_FLAG_FULLY_ESTABLISHED)
*cap++ = 'e';
if (flags & MPTCP_SUBFLOW_FLAG_CONNECTED)
*cap++ = 'c';
if (flags & MPTCP_SUBFLOW_FLAG_MAPVALID)
*cap++ = 'v';
if (flags)
out(" flags:%s", caps);
}
if (tb[MPTCP_SUBFLOW_ATTR_TOKEN_REM] &&
tb[MPTCP_SUBFLOW_ATTR_TOKEN_LOC] &&
tb[MPTCP_SUBFLOW_ATTR_ID_REM] &&
tb[MPTCP_SUBFLOW_ATTR_ID_LOC])
out(" token:%04x(id:%hhu)/%04x(id:%hhu)",
rta_getattr_u32(tb[MPTCP_SUBFLOW_ATTR_TOKEN_REM]),
rta_getattr_u8(tb[MPTCP_SUBFLOW_ATTR_ID_REM]),
rta_getattr_u32(tb[MPTCP_SUBFLOW_ATTR_TOKEN_LOC]),
rta_getattr_u8(tb[MPTCP_SUBFLOW_ATTR_ID_LOC]));
if (tb[MPTCP_SUBFLOW_ATTR_MAP_SEQ])
out(" seq:%llx",
rta_getattr_u64(tb[MPTCP_SUBFLOW_ATTR_MAP_SEQ]));
if (tb[MPTCP_SUBFLOW_ATTR_MAP_SFSEQ])
out(" sfseq:%x",
rta_getattr_u32(tb[MPTCP_SUBFLOW_ATTR_MAP_SFSEQ]));
if (tb[MPTCP_SUBFLOW_ATTR_SSN_OFFSET])
out(" ssnoff:%x",
rta_getattr_u32(tb[MPTCP_SUBFLOW_ATTR_SSN_OFFSET]));
if (tb[MPTCP_SUBFLOW_ATTR_MAP_DATALEN])
out(" maplen:%x",
rta_getattr_u32(tb[MPTCP_SUBFLOW_ATTR_MAP_DATALEN]));
}
#define TCPI_HAS_OPT(info, opt) !!(info->tcpi_options & (opt))
static void tcp_show_info(const struct nlmsghdr *nlh, struct inet_diag_msg *r,
@ -3012,6 +3066,14 @@ static void tcp_show_info(const struct nlmsghdr *nlh, struct inet_diag_msg *r,
tcp_tls_conf("rxconf", tlsinfo[TLS_INFO_RXCONF]);
tcp_tls_conf("txconf", tlsinfo[TLS_INFO_TXCONF]);
}
if (ulpinfo[INET_ULP_INFO_MPTCP]) {
struct rtattr *sfinfo[MPTCP_SUBFLOW_ATTR_MAX + 1] =
{ 0 };
parse_rtattr_nested(sfinfo, MPTCP_SUBFLOW_ATTR_MAX,
ulpinfo[INET_ULP_INFO_MPTCP]);
mptcp_subflow_info(sfinfo);
}
}
}