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Date: Tue, 3 Oct 2017 13:57:42 -0400
From: Stefan Hajnoczi <stefanha@...hat.com>
To: netdev@...r.kernel.org
Cc: Stephen Hemminger <stephen@...workplumber.org>,
Jorgen Hansen <jhansen@...are.com>,
Dexuan Cui <decui@...rosoft.com>,
Stefan Hajnoczi <stefanha@...hat.com>
Subject: [PATCH iproute2 1/3] ss: allow AF_FAMILY constants >32
Linux has more than 32 address families defined in <bits/socket.h>. Use
a 64-bit type so all of them can be represented in the filter->families
bitmask.
It's easy to introduce bugs when using (1 << AF_FAMILY) because the
value is 32-bit. This can produce incorrect results from bitmask
operations so introduce the FAMILY_MASK() macro to eliminate these bugs.
Signed-off-by: Stefan Hajnoczi <stefanha@...hat.com>
---
misc/ss.c | 54 ++++++++++++++++++++++++++++--------------------------
1 file changed, 28 insertions(+), 26 deletions(-)
diff --git a/misc/ss.c b/misc/ss.c
index dd8dfaa4..12a31c90 100644
--- a/misc/ss.c
+++ b/misc/ss.c
@@ -170,55 +170,57 @@ enum {
struct filter {
int dbs;
int states;
- int families;
+ __u64 families;
struct ssfilter *f;
bool kill;
};
+#define FAMILY_MASK(family) ((__u64)1 << (family))
+
static const struct filter default_dbs[MAX_DB] = {
[TCP_DB] = {
.states = SS_CONN,
- .families = (1 << AF_INET) | (1 << AF_INET6),
+ .families = FAMILY_MASK(AF_INET) | FAMILY_MASK(AF_INET6),
},
[DCCP_DB] = {
.states = SS_CONN,
- .families = (1 << AF_INET) | (1 << AF_INET6),
+ .families = FAMILY_MASK(AF_INET) | FAMILY_MASK(AF_INET6),
},
[UDP_DB] = {
.states = (1 << SS_ESTABLISHED),
- .families = (1 << AF_INET) | (1 << AF_INET6),
+ .families = FAMILY_MASK(AF_INET) | FAMILY_MASK(AF_INET6),
},
[RAW_DB] = {
.states = (1 << SS_ESTABLISHED),
- .families = (1 << AF_INET) | (1 << AF_INET6),
+ .families = FAMILY_MASK(AF_INET) | FAMILY_MASK(AF_INET6),
},
[UNIX_DG_DB] = {
.states = (1 << SS_CLOSE),
- .families = (1 << AF_UNIX),
+ .families = FAMILY_MASK(AF_UNIX),
},
[UNIX_ST_DB] = {
.states = SS_CONN,
- .families = (1 << AF_UNIX),
+ .families = FAMILY_MASK(AF_UNIX),
},
[UNIX_SQ_DB] = {
.states = SS_CONN,
- .families = (1 << AF_UNIX),
+ .families = FAMILY_MASK(AF_UNIX),
},
[PACKET_DG_DB] = {
.states = (1 << SS_CLOSE),
- .families = (1 << AF_PACKET),
+ .families = FAMILY_MASK(AF_PACKET),
},
[PACKET_R_DB] = {
.states = (1 << SS_CLOSE),
- .families = (1 << AF_PACKET),
+ .families = FAMILY_MASK(AF_PACKET),
},
[NETLINK_DB] = {
.states = (1 << SS_CLOSE),
- .families = (1 << AF_NETLINK),
+ .families = FAMILY_MASK(AF_NETLINK),
},
[SCTP_DB] = {
.states = SS_CONN,
- .families = (1 << AF_INET) | (1 << AF_INET6),
+ .families = FAMILY_MASK(AF_INET) | FAMILY_MASK(AF_INET6),
},
};
@@ -258,14 +260,14 @@ static void filter_db_set(struct filter *f, int db)
static void filter_af_set(struct filter *f, int af)
{
f->states |= default_afs[af].states;
- f->families |= 1 << af;
+ f->families |= FAMILY_MASK(af);
do_default = 0;
preferred_family = af;
}
static int filter_af_get(struct filter *f, int af)
{
- return f->families & (1 << af);
+ return !!(f->families & FAMILY_MASK(af));
}
static void filter_default_dbs(struct filter *f)
@@ -302,7 +304,7 @@ static void filter_merge_defaults(struct filter *f)
f->families |= default_dbs[db].families;
}
for (af = 0; af < AF_MAX; af++) {
- if (!(f->families & (1 << af)))
+ if (!(f->families & FAMILY_MASK(af)))
continue;
if (!(default_afs[af].dbs & f->dbs))
@@ -2608,7 +2610,7 @@ static int show_one_inet_sock(const struct sockaddr_nl *addr,
struct inet_diag_msg *r = NLMSG_DATA(h);
struct sockstat s = {};
- if (!(diag_arg->f->families & (1 << r->idiag_family)))
+ if (!(diag_arg->f->families & FAMILY_MASK(r->idiag_family)))
return 0;
parse_diag_msg(h, &s);
@@ -2802,7 +2804,7 @@ static int tcp_show(struct filter *f)
return -1;
}
- if (f->families & (1<<AF_INET)) {
+ if (f->families & FAMILY_MASK(AF_INET)) {
if ((fp = net_tcp_open()) == NULL)
goto outerr;
@@ -2812,7 +2814,7 @@ static int tcp_show(struct filter *f)
fclose(fp);
}
- if ((f->families & (1<<AF_INET6)) &&
+ if ((f->families & FAMILY_MASK(AF_INET6)) &&
(fp = net_tcp6_open()) != NULL) {
setbuffer(fp, buf, bufsize);
if (generic_record_read(fp, tcp_show_line, f, AF_INET6))
@@ -2911,7 +2913,7 @@ static int udp_show(struct filter *f)
&& inet_show_netlink(f, NULL, IPPROTO_UDP) == 0)
return 0;
- if (f->families&(1<<AF_INET)) {
+ if (f->families&FAMILY_MASK(AF_INET)) {
if ((fp = net_udp_open()) == NULL)
goto outerr;
if (generic_record_read(fp, dgram_show_line, f, AF_INET))
@@ -2919,7 +2921,7 @@ static int udp_show(struct filter *f)
fclose(fp);
}
- if ((f->families&(1<<AF_INET6)) &&
+ if ((f->families&FAMILY_MASK(AF_INET6)) &&
(fp = net_udp6_open()) != NULL) {
if (generic_record_read(fp, dgram_show_line, f, AF_INET6))
goto outerr;
@@ -2951,7 +2953,7 @@ static int raw_show(struct filter *f)
inet_show_netlink(f, NULL, IPPROTO_RAW) == 0)
return 0;
- if (f->families&(1<<AF_INET)) {
+ if (f->families&FAMILY_MASK(AF_INET)) {
if ((fp = net_raw_open()) == NULL)
goto outerr;
if (generic_record_read(fp, dgram_show_line, f, AF_INET))
@@ -2959,7 +2961,7 @@ static int raw_show(struct filter *f)
fclose(fp);
}
- if ((f->families&(1<<AF_INET6)) &&
+ if ((f->families&FAMILY_MASK(AF_INET6)) &&
(fp = net_raw6_open()) != NULL) {
if (generic_record_read(fp, dgram_show_line, f, AF_INET6))
goto outerr;
@@ -3703,13 +3705,13 @@ static int handle_follow_request(struct filter *f)
int groups = 0;
struct rtnl_handle rth;
- if (f->families & (1 << AF_INET) && f->dbs & (1 << TCP_DB))
+ if (f->families & FAMILY_MASK(AF_INET) && f->dbs & (1 << TCP_DB))
groups |= 1 << (SKNLGRP_INET_TCP_DESTROY - 1);
- if (f->families & (1 << AF_INET) && f->dbs & (1 << UDP_DB))
+ if (f->families & FAMILY_MASK(AF_INET) && f->dbs & (1 << UDP_DB))
groups |= 1 << (SKNLGRP_INET_UDP_DESTROY - 1);
- if (f->families & (1 << AF_INET6) && f->dbs & (1 << TCP_DB))
+ if (f->families & FAMILY_MASK(AF_INET6) && f->dbs & (1 << TCP_DB))
groups |= 1 << (SKNLGRP_INET6_TCP_DESTROY - 1);
- if (f->families & (1 << AF_INET6) && f->dbs & (1 << UDP_DB))
+ if (f->families & FAMILY_MASK(AF_INET6) && f->dbs & (1 << UDP_DB))
groups |= 1 << (SKNLGRP_INET6_UDP_DESTROY - 1);
if (groups == 0)
--
2.13.6
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