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iproute2/iproute2/ip/xfrm_policy.c

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/* $USAGI: $ */
/*
* Copyright (C)2004 USAGI/WIDE Project
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* based on iproute.c
*/
/*
* Authors:
* Masahide NAKAMURA @USAGI
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netdb.h>
#include <linux/netlink.h>
#include <linux/xfrm.h>
#include "utils.h"
#include "xfrm.h"
#include "ip_common.h"
//#define NLMSG_FLUSH_BUF_SIZE (4096-512)
#define NLMSG_FLUSH_BUF_SIZE 8192
/*
* Receiving buffer defines:
* nlmsg
* data = struct xfrm_userpolicy_info
* rtattr
* data = struct xfrm_user_tmpl[]
*/
#define NLMSG_BUF_SIZE 4096
#define RTA_BUF_SIZE 2048
#define XFRM_TMPLS_BUF_SIZE 1024
static void usage(void) __attribute__((noreturn));
static void usage(void)
{
fprintf(stderr, "Usage: ip xfrm policy { add | update } dir DIR sel SELECTOR [ index INDEX ] \n");
fprintf(stderr, " [ action ACTION ] [ priority PRIORITY ] [ LIMIT-LIST ] [ TMPL-LIST ]\n");
fprintf(stderr, "Usage: ip xfrm policy { merge | change | replace } dir DIR\n");
fprintf(stderr, " [ sel SELECTOR | index INDEX ] [ TMPL-LIST ]\n");
fprintf(stderr, "Usage: ip xfrm policy { delete | get } dir DIR [ sel SELECTOR | index INDEX ]\n");
fprintf(stderr, "Usage: ip xfrm policy { flush | list } [ dir DIR ] [ sel SELECTOR ]\n");
fprintf(stderr, " [ index INDEX ] [ action ACTION ] [ priority PRIORITY ]\n");
fprintf(stderr, "DIR := [ in | out | fwd ]\n");
fprintf(stderr, "SELECTOR := src ADDR[/PLEN] dst ADDR[/PLEN] [ upspec UPSPEC ] [ dev DEV ]\n");
fprintf(stderr, "UPSPEC := proto PROTO [ UPSPEC_OPT ]\n");
fprintf(stderr, "UPSPEC_OPT := [ [ sport PORT ] [ dport PORT ] ] |\n");
#ifdef USE_MIP6
fprintf(stderr, " [ type TYPE [ code CODE ] ](for PROTO=ipv6-icmp) |\n");
fprintf(stderr, " [ type TYPE ](for PROTO=ipv6-mh)\n");
#else
fprintf(stderr, " [ type TYPE [ code CODE ] ](for PROTO=ipv6-icmp)\n");
#endif
//fprintf(stderr, "DEV - device name(default=none)\n");
fprintf(stderr, "ACTION := [ allow | block ](default=allow)\n");
//fprintf(stderr, "PRIORITY - priority value(default=0)\n");
fprintf(stderr, "LIMIT-LIST := [ LIMIT-LIST ] | [ limit LIMIT ]\n");
fprintf(stderr, "LIMIT := [ [time-soft|time-hard|time-use-soft|time-use-hard] SECONDS ] |\n");
fprintf(stderr, " [ [byte-soft|byte-hard] SIZE ] | [ [packet-soft|packet-hard] NUMBER ]\n");
fprintf(stderr, "TMPL-LIST := [ TMPL-LIST ] | [ tmpl TMPL ] | [ tmpl remain ](change only)\n");
fprintf(stderr, "TMPL := ID [ mode MODE ] [ reqid REQID ] [ level LEVEL ]\n");
fprintf(stderr, "ID := [ src ADDR ] [ dst ADDR ] [ proto XFRM_PROTO ] [ spi SPI ]\n");
#ifdef USE_MIP6
fprintf(stderr, "XFRM_PROTO := [ esp | ah | ipcomp | route2 | hao ]\n");
#else
fprintf(stderr, "XFRM_PROTO := [ esp | ah | ipcomp ]\n");
#endif
fprintf(stderr, "MODE := [ transport | tunnel ](default=transport)\n");
//fprintf(stderr, "REQID - number(default=0)\n");
fprintf(stderr, "LEVEL := [ required | use ](default=required)\n");
exit(-1);
}
static int xfrm_policy_dir_parse(__u8 *dir, int *argcp, char ***argvp)
{
int argc = *argcp;
char **argv = *argvp;
if (strcmp(*argv, "in") == 0)
*dir = XFRM_POLICY_IN;
else if (strcmp(*argv, "out") == 0)
*dir = XFRM_POLICY_OUT;
else if (strcmp(*argv, "fwd") == 0)
*dir = XFRM_POLICY_FWD;
else
invarg("\"DIR\" is invalid", *argv);
*argcp = argc;
*argvp = argv;
return 0;
}
static int xfrm_tmpl_parse(struct xfrm_user_tmpl *tmpl,
int *argcp, char ***argvp)
{
int argc = *argcp;
char **argv = *argvp;
char *idp = NULL;
while (1) {
if (strcmp(*argv, "mode") == 0) {
NEXT_ARG();
xfrm_mode_parse(&tmpl->mode, &argc, &argv);
} else if (strcmp(*argv, "reqid") == 0) {
NEXT_ARG();
xfrm_reqid_parse(&tmpl->reqid, &argc, &argv);
} else if (strcmp(*argv, "level") == 0) {
NEXT_ARG();
if (strcmp(*argv, "required") == 0)
tmpl->optional = 0;
else if (strcmp(*argv, "use") == 0)
tmpl->optional = 1;
else
invarg("\"level\" value is invalid\n", *argv);
} else {
if (idp) {
PREV_ARG(); /* back track */
break;
}
idp = *argv;
xfrm_id_parse(&tmpl->saddr, &tmpl->id, &tmpl->family,
&argc, &argv);
if (preferred_family == AF_UNSPEC)
preferred_family = tmpl->family;
}
if (!NEXT_ARG_OK())
break;
NEXT_ARG();
}
if (argc == *argcp)
missarg("TMPL");
*argcp = argc;
*argvp = argv;
return 0;
}
static int xfrm_policy_modify(int cmd, unsigned flags, int argc, char **argv)
{
struct rtnl_handle rth;
struct {
struct nlmsghdr n;
struct xfrm_userpolicy_info xpinfo;
char buf[RTA_BUF_SIZE];
} req;
char *dirp = NULL;
char tmpls_buf[XFRM_TMPLS_BUF_SIZE];
int tmpls_len = 0;
memset(&req, 0, sizeof(req));
memset(&tmpls_buf, 0, sizeof(tmpls_buf));
req.n.nlmsg_len = NLMSG_LENGTH(sizeof(req.xpinfo));
req.n.nlmsg_flags = NLM_F_REQUEST|flags;
req.n.nlmsg_type = cmd;
req.xpinfo.sel.family = preferred_family;
req.xpinfo.lft.soft_byte_limit = XFRM_INF;
req.xpinfo.lft.hard_byte_limit = XFRM_INF;
req.xpinfo.lft.soft_packet_limit = XFRM_INF;
req.xpinfo.lft.hard_packet_limit = XFRM_INF;
while (argc > 0) {
if (strcmp(*argv, "dir") == 0) {
if (dirp)
duparg("dir", *argv);
dirp = *argv;
NEXT_ARG();
xfrm_policy_dir_parse(&req.xpinfo.dir, &argc, &argv);
filter.dir_mask = XFRM_FILTER_MASK_FULL;
} else if (strcmp(*argv, "sel") == 0) {
NEXT_ARG();
xfrm_selector_parse(&req.xpinfo.sel, &argc, &argv);
if (preferred_family == AF_UNSPEC)
preferred_family = req.xpinfo.sel.family;
} else if (strcmp(*argv, "index") == 0) {
NEXT_ARG();
if (get_u32(&req.xpinfo.index, *argv, 0))
invarg("\"INDEX\" is invalid", *argv);
filter.index_mask = XFRM_FILTER_MASK_FULL;
} else if (strcmp(*argv, "action") == 0) {
NEXT_ARG();
if (strcmp(*argv, "allow") == 0)
req.xpinfo.action = XFRM_POLICY_ALLOW;
else if (strcmp(*argv, "block") == 0)
req.xpinfo.action = XFRM_POLICY_BLOCK;
else
invarg("\"action\" value is invalid\n", *argv);
filter.action_mask = XFRM_FILTER_MASK_FULL;
} else if (strcmp(*argv, "priority") == 0) {
NEXT_ARG();
if (get_u32(&req.xpinfo.priority, *argv, 0))
invarg("\"PRIORITY\" is invalid", *argv);
filter.priority_mask = XFRM_FILTER_MASK_FULL;
} else if (strcmp(*argv, "limit") == 0) {
NEXT_ARG();
xfrm_lifetime_cfg_parse(&req.xpinfo.lft, &argc, &argv);
} else if (strcmp(*argv, "tmpl") == 0) {
struct xfrm_user_tmpl *tmpl;
if (tmpls_len + sizeof(*tmpl) > sizeof(tmpls_buf)) {
fprintf(stderr, "Too many tmpls: buffer overflow\n");
exit(1);
}
tmpl = (struct xfrm_user_tmpl *)((char *)tmpls_buf + tmpls_len);
tmpl->family = preferred_family;
tmpl->aalgos = (~(__u32)0);
tmpl->ealgos = (~(__u32)0);
tmpl->calgos = (~(__u32)0);
NEXT_ARG();
xfrm_tmpl_parse(tmpl, &argc, &argv);
tmpls_len += sizeof(*tmpl);
} else
invarg("unknown", *argv);
argc--; argv++;
}
if (!dirp) {
fprintf(stderr, "Not enough information: \"DIR\" is required.\n");
exit(1);
}
if (tmpls_len > 0) {
addattr_l(&req.n, sizeof(req), XFRMA_TMPL,
(void *)tmpls_buf, tmpls_len);
}
if (rtnl_open_byproto(&rth, 0, NETLINK_XFRM) < 0)
exit(1);
if (req.xpinfo.sel.family == AF_UNSPEC)
req.xpinfo.sel.family = AF_INET;
if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
exit(2);
rtnl_close(&rth);
return 0;
}
static int xfrm_policy_filter_match(struct xfrm_userpolicy_info *xpinfo)
{
if (!filter.use)
return 1;
if ((xpinfo->dir^filter.xpinfo.dir)&filter.dir_mask)
return 0;
if (filter.sel_src_mask) {
if (memcmp(&xpinfo->sel.saddr, &filter.xpinfo.sel.saddr,
filter.sel_src_mask) != 0)
return 0;
if (xpinfo->sel.prefixlen_s != filter.xpinfo.sel.prefixlen_s)
return 0;
}
if (filter.sel_dst_mask) {
if (memcmp(&xpinfo->sel.daddr, &filter.xpinfo.sel.daddr,
filter.sel_dst_mask) != 0)
return 0;
if (xpinfo->sel.prefixlen_d != filter.xpinfo.sel.prefixlen_d)
return 0;
}
if ((xpinfo->sel.ifindex^filter.xpinfo.sel.ifindex)&filter.sel_dev_mask)
return 0;
if ((xpinfo->sel.proto^filter.xpinfo.sel.proto)&filter.upspec_proto_mask)
return 0;
if (filter.upspec_sport_mask) {
if (xpinfo->sel.proto == IPPROTO_ICMPV6)
return 0;
#ifdef USE_MIP6
if (xpinfo->sel.proto == IPPROTO_MH)
return 0;
#endif
if ((xpinfo->sel.sport^filter.xpinfo.sel.sport)&filter.upspec_sport_mask)
return 0;
}
if (filter.upspec_dport_mask) {
if (xpinfo->sel.proto == IPPROTO_ICMPV6)
return 0;
#ifdef USE_MIP6
if (xpinfo->sel.proto == IPPROTO_MH)
return 0;
#endif
if ((xpinfo->sel.dport^filter.xpinfo.sel.dport)&filter.upspec_dport_mask)
return 0;
}
if (filter.upspec_type_mask) {
if (xpinfo->sel.proto == IPPROTO_ICMPV6) {
if ((xpinfo->sel.xfrmsel_icmp_type^filter.xpinfo.sel.xfrmsel_icmp_type)&filter.xpinfo.sel.xfrmsel_icmp_type_mask)
return 0;
#ifdef USE_MIP6
} else if (xpinfo->sel.proto == IPPROTO_MH) {
if ((xpinfo->sel.xfrmsel_mh_type^filter.xpinfo.sel.xfrmsel_mh_type)&filter.xpinfo.sel.xfrmsel_mh_type_mask)
return 0;
#endif
} else
return 0;
}
if (filter.upspec_code_mask) {
if (xpinfo->sel.proto == IPPROTO_ICMPV6) {
if ((xpinfo->sel.xfrmsel_icmp_code^filter.xpinfo.sel.xfrmsel_icmp_code)&filter.upspec_code_mask)
return 0;
} else
return 0;
}
if ((xpinfo->index^filter.xpinfo.index)&filter.index_mask)
return 0;
if ((xpinfo->action^filter.xpinfo.action)&filter.action_mask)
return 0;
if ((xpinfo->priority^filter.xpinfo.priority)&filter.priority_mask)
return 0;
return 1;
}
int xfrm_policy_print(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
{
FILE *fp = (FILE*)arg;
struct xfrm_userpolicy_info *xpinfo = NLMSG_DATA(n);
int len = n->nlmsg_len;
struct rtattr * tb[XFRM_MAX_DEPTH];
int ntb;
if (n->nlmsg_type != XFRM_MSG_NEWPOLICY &&
n->nlmsg_type != XFRM_MSG_DELPOLICY) {
fprintf(stderr, "Not a policy: %08x %08x %08x\n",
n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
return 0;
}
len -= NLMSG_LENGTH(sizeof(*xpinfo));
if (len < 0) {
fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
return -1;
}
if (!xfrm_policy_filter_match(xpinfo))
return 0;
memset(tb, 0, sizeof(tb));
ntb = parse_rtattr_byindex(tb, XFRM_MAX_DEPTH, XFRMP_RTA(xpinfo), len);
if (n->nlmsg_type == XFRM_MSG_DELPOLICY)
fprintf(fp, "Deleted ");
xfrm_selector_print(&xpinfo->sel, preferred_family, fp, NULL);
fprintf(fp, "\t");
fprintf(fp, "%s ", (xpinfo->dir == XFRM_POLICY_IN ? "in " :
xpinfo->dir == XFRM_POLICY_OUT ? "out" :
xpinfo->dir == XFRM_POLICY_FWD ? "fwd" :
"unknown-dir"));
fprintf(fp, "%s ", (xpinfo->action == XFRM_POLICY_ALLOW ? "allow" :
xpinfo->action == XFRM_POLICY_BLOCK ? "block" :
"unknown-action"));
fprintf(fp, "index %u ", xpinfo->index);
fprintf(fp, "priority %u ", xpinfo->priority);
fprintf(fp, "share %s ", strxf_share(xpinfo->share));
fprintf(fp, "flags 0x%s", strxf_flags(xpinfo->flags));
fprintf(fp, "\n");
if (show_stats > 0)
xfrm_lifetime_print(&xpinfo->lft, &xpinfo->curlft, fp, "\t");
xfrm_xfrma_print(tb, ntb, xpinfo->sel.family, fp, "\t");
return 0;
}
static int xfrm_policy_get_or_delete(int argc, char **argv, int delete,
void *res_nlbuf)
{
struct rtnl_handle rth;
struct {
struct nlmsghdr n;
struct xfrm_userpolicy_id xpid;
} req;
char *dirp = NULL;
char *selp = NULL;
char *indexp = NULL;
memset(&req, 0, sizeof(req));
req.n.nlmsg_len = NLMSG_LENGTH(sizeof(req.xpid));
req.n.nlmsg_flags = NLM_F_REQUEST;
req.n.nlmsg_type = delete ? XFRM_MSG_DELPOLICY : XFRM_MSG_GETPOLICY;
while (argc > 0) {
if (strcmp(*argv, "dir") == 0) {
if (dirp)
duparg("dir", *argv);
dirp = *argv;
NEXT_ARG();
xfrm_policy_dir_parse(&req.xpid.dir, &argc, &argv);
} else if (strcmp(*argv, "sel") == 0) {
if (selp)
duparg("sel", *argv);
selp = *argv;
NEXT_ARG();
xfrm_selector_parse(&req.xpid.sel, &argc, &argv);
if (preferred_family == AF_UNSPEC)
preferred_family = req.xpid.sel.family;
} else if (strcmp(*argv, "index") == 0) {
if (indexp)
duparg("index", *argv);
indexp = *argv;
NEXT_ARG();
if (get_u32(&req.xpid.index, *argv, 0))
invarg("\"INDEX\" is invalid", *argv);
} else
invarg("unknown", *argv);
argc--; argv++;
}
if (!dirp) {
fprintf(stderr, "Not enough information: \"DIR\" is required.\n");
exit(1);
}
if (!selp && !indexp) {
fprintf(stderr, "Not enough information: either \"SELECTOR\" or \"INDEX\" is required.\n");
exit(1);
}
if (selp && indexp)
duparg2("SELECTOR", "INDEX");
if (rtnl_open_byproto(&rth, 0, NETLINK_XFRM) < 0)
exit(1);
if (req.xpid.sel.family == AF_UNSPEC)
req.xpid.sel.family = AF_INET;
if (rtnl_talk(&rth, &req.n, 0, 0, res_nlbuf, NULL, NULL) < 0)
exit(2);
rtnl_close(&rth);
return 0;
}
/*
* Smaller scored tmpl should be first for a policy.
* Score=0 means unknown protocol or one which can't be judged.
*/
static int xfrm_id_proto_score(__u8 proto, __u8 dir)
{
/*
* Basically, score is reversed order as extensions headers
*
* <- large small ->
* [IP][..][RT2][HAO][..][AH][ESP][COMP][..]
*
* Exception:
* At outbound case, any protocols should be followed AH.
*/
switch (proto) {
case IPPROTO_ESP:
return (1 << 3);
case IPPROTO_AH:
if (dir == XFRM_POLICY_IN)
return (1 << 4);
else
return (1 << 12);
case IPPROTO_COMP:
return (1 << 2);
#ifdef USE_MIP6
case IPPROTO_ROUTING: /* assuming RT2 */
return (1 << 7);
case IPPROTO_DSTOPTS: /* assuming HAO */
return (1 << 6);
#endif
default:
break;
}
return 0;
}
/*
* Compare templates t1 and t2 and return less than, equal to, or greater
* than zero if t1 is found respectively, to be before, to be the same,
* or to be after than t2 for its "preferred" order for a policy
* in using under IPsec and/or MIPv6.
*/
static int xfrm_tmpl_preferred_cmp(struct xfrm_user_tmpl *t1,
struct xfrm_user_tmpl *t2,
__u8 dir)
{
int score1;
int score2;
score1 = xfrm_id_proto_score(t1->id.proto, dir);
if (score1 == 0) {
/* assume t1 as lower score */
return -1;
}
score2 = xfrm_id_proto_score(t2->id.proto, dir);
return (score1 - score2);
}
static int xfrm_tmpl_extract(struct rtattr *tb[], int ntb,
struct xfrm_user_tmpl *tmpls, int *ntmpls)
{
int idx = 0;
__u16 type;
int n;
struct xfrm_user_tmpl *t;
int i;
int j;
/* store existing templates */
for (i = 0; i < ntb; i++) {
type = tb[i]->rta_type;
if (type != XFRMA_TMPL) {
fprintf(stderr, "Policy has attr which is not template: %u\n", type);
exit(1);
}
n = tb[i]->rta_len / sizeof(struct xfrm_user_tmpl);
t = (struct xfrm_user_tmpl *)RTA_DATA(tb[i]);
for (j = 0; j < n; j++) {
memcpy(&tmpls[idx], &t[j], sizeof(tmpls[idx]));
idx ++;
}
}
*ntmpls = idx;
return 0;
}
/*
* (existing tmpl=ET, new tmpls=NT)
* Any ET keeps sequence within ETs (ET never changes order within ETs).
* It is also NT's case. With those rules, tmpls are merged by preferred order.
*/
static int xfrm_tmpl_merge(struct xfrm_user_tmpl *tcur, int n_tcur,
struct xfrm_user_tmpl *tnew, int n_tnew,
__u8 dir, struct nlmsghdr *n, int len)
{
struct tmpl_list {
struct tmpl_list *next;
struct xfrm_user_tmpl *tmplp;
};
struct tmpl_list *head = NULL;
struct tmpl_list *prev;
struct tmpl_list *p;
struct xfrm_user_tmpl tmpls[XFRM_MAX_DEPTH];
int ntmpls;
int i;
if (n_tcur + n_tnew > XFRM_MAX_DEPTH) {
fprintf(stderr, "Too many tmpls when merging: exists=%u + new=%u makes overflow\n", n_tcur, n_tnew);
exit(1);
}
fprintf(stderr, "DEBUG: %s: dir = %s\n", __FUNCTION__,
(dir == XFRM_POLICY_IN ? "in " :
dir == XFRM_POLICY_OUT ? "out" :
dir == XFRM_POLICY_FWD ? "fwd" :
"unknown-dir"));
/* store existing templates to list */
prev = NULL;
for (i = 0; i < n_tcur; i++) {
struct tmpl_list *tl;
tl = malloc(sizeof(struct tmpl_list));
if (!tl) {
perror("malloc");
exit(1);
}
tl->next = NULL;
tl->tmplp = &tcur[i];
fprintf(stderr, "DEBUG: kernel tmpl %d = %u\n",i+1,tl->tmplp->id.proto);
if (!prev)
head = tl;
else
prev->next = tl;
prev = tl;
}
#if 1
for (i = 0; i < n_tnew; i++)
fprintf(stderr, "DEBUG: new tmpl %d = %u\n",i+1,tnew[i].id.proto);
#endif
/* order them; compare and insert new one to list */
i = 0;
prev = NULL;
for (p = head; p; p = p->next) {
int cmp = xfrm_tmpl_preferred_cmp(p->tmplp, &tnew[i], dir);
if (cmp > 0) {
struct tmpl_list *tl;
tl = malloc(sizeof(struct tmpl_list));
if (!tl) {
perror("malloc");
exit(1);
}
tl->tmplp = &tnew[i];
tl->next = p;
if (p == head)
head = tl;
if (prev)
prev->next = tl;
p = tl;
i ++;
}
prev = p;
if (i >= n_tnew)
break;
}
if (!p) {
/* append rest of new tmpls to the end of list */
p = prev;
for (; i < n_tnew; i++) {
struct tmpl_list *tl;
tl = malloc(sizeof(struct tmpl_list));
if (!tl) {
perror("malloc");
exit(1);
}
tl->tmplp = &tnew[i];
tl->next = NULL;
if (!p) /* no kernel tmpls case */
head = tl;
else
p->next = tl;
p = tl;
}
}
/* store ordered list to buffer */
memset(&tmpls, 0, sizeof(tmpls));
i = 0;
for (p = head; p; p = p->next) {
if (i >= sizeof(tmpls) / sizeof(tmpls[0])) {
fprintf(stderr, "Too many tmpls: buffer overflow\n");
exit(1);
}
memcpy(&tmpls[i], p->tmplp, sizeof(tmpls[i]));
fprintf(stderr, "DEBUG: merged tmpl %d = %u\n", i+1, p->tmplp->id.proto);
i ++;
}
ntmpls = i;
prev = NULL;
for (p = head; p; p = p->next) {
if (prev)
free(prev);
prev = p;
}
if (prev)
free(prev);
addattr_l(n, len, XFRMA_TMPL, (void *)tmpls,
(sizeof(struct xfrm_user_tmpl) * ntmpls));
return 0;
}
/*
* (existing tmpl=ET, new tmpls=NT)
* Updates ET by specified NT at each order without "remain" NT.
*/
static int xfrm_tmpl_change(struct xfrm_user_tmpl *tcur, int n_tcur,
struct xfrm_user_tmpl *tnew, int n_tnew,
__u8 dir, struct nlmsghdr *n, int len)
{
struct xfrm_user_tmpl tmpls[XFRM_MAX_DEPTH];
int ntmpls;
int n_changed = 0;
int i;
if (n_tcur != n_tnew) {
fprintf(stderr, "Templates count differs: %d != %d\n",
n_tcur, n_tnew);
exit(1);
}
if (n_tcur >= sizeof(tmpls) / sizeof(tmpls[0])) {
fprintf(stderr, "Too many tmpls: buffer overflow\n");
exit(1);
}
fprintf(stderr, "DEBUG: %s: dir = %s\n", __FUNCTION__,
(dir == XFRM_POLICY_IN ? "in " :
dir == XFRM_POLICY_OUT ? "out" :
dir == XFRM_POLICY_FWD ? "fwd" :
"unknown-dir"));
/* change it to new one except remain request */
for (i = 0; i < n_tcur; i++) {
struct xfrm_user_tmpl *t;
if (tnew[i].id.proto == 0) /* remain case */
t = &tcur[i];
else {
t = &tnew[i];
n_changed ++;
}
memcpy(&tmpls[i], t, sizeof(tmpls[i]));
}
ntmpls = n_tcur;
if (n_changed == 0) {
fprintf(stderr, "No template to be changed is found.\n");
exit(1);
}
fprintf(stderr, "DEBUG: changed tmpls = %d\n", n_changed);
addattr_l(n, len, XFRMA_TMPL, (void *)tmpls,
(sizeof(struct xfrm_user_tmpl) * ntmpls));
return 0;
}
/*
* (existing tmpl=ET, new tmpls=NT)
* Updates the first ET whose protocol is matched with NT once.
*/
static int xfrm_tmpl_replace(struct xfrm_user_tmpl *tcur, int n_tcur,
struct xfrm_user_tmpl *tnew, int n_tnew,
__u8 dir, struct nlmsghdr *n, int len)
{
struct xfrm_user_tmpl tmpls[XFRM_MAX_DEPTH];
int ntmpls;
int n_replaced = 0;
int i;
int j;
if (n_tcur < n_tnew) {
fprintf(stderr, "Too many tmpls: %d < %d: replace request should be less than current\n", n_tcur, n_tnew);
exit(1);
}
if (n_tcur >= sizeof(tmpls) / sizeof(tmpls[0])) {
fprintf(stderr, "Too many tmpls: buffer overflow\n");
exit(1);
}
/* check if duplcate protocol is found */
for (i = 0; i < n_tnew; i++) {
for (j = i + 1; j < n_tnew; j++) {
if (tnew[j].id.proto == tnew[i].id.proto) {
fprintf(stderr, "Duplicate protocol specified by replacing request\n");
exit(1);
}
}
}
/* at first, just store existing tmpls to buffer */
for (i = 0; i < n_tcur; i++)
memcpy(&tmpls[i], &tcur[i], sizeof(tmpls[i]));
ntmpls = n_tcur;
/* compare and change it to new one */
for (i = 0; i < n_tnew; i++) {
if (tnew[i].id.proto == 0) /* remain case */
continue;
for (j = 0; j < ntmpls; j++) {
if (tmpls[j].id.proto == tnew[i].id.proto) {
memcpy(&tmpls[j], &tnew[i], sizeof(tmpls[j]));
n_replaced ++;
break;
}
}
}
if (n_replaced == 0) {
fprintf(stderr, "No template to be replaced is found.\n");
exit(1);
}
fprintf(stderr, "DEBUG: %s: dir = %s\n", __FUNCTION__,
(dir == XFRM_POLICY_IN ? "in " :
dir == XFRM_POLICY_OUT ? "out" :
dir == XFRM_POLICY_FWD ? "fwd" :
"unknown-dir"));
fprintf(stderr, "DEBUG: replaced tmpls = %d\n", n_replaced);
addattr_l(n, len, XFRMA_TMPL, (void *)tmpls,
(sizeof(struct xfrm_user_tmpl) * ntmpls));
return 0;
}
/*
* To modify templates, get existing policy and then update it.
*
* "modify":
* 0 : To merge both exsiting template and new one.
* 1 : To change existing template by which new one at each order.
* 2 : To replace existing template whose protocol is matched by new one.
* Each replacing occurs once.
*/
static int xfrm_policy_tmpl_modify(int cmd, unsigned flags,
int argc, char **argv, int modify)
{
struct rtnl_handle rth;
struct {
struct nlmsghdr n;
struct xfrm_userpolicy_id xpid;
} req;
char *dirp = NULL;
char *selp = NULL;
char *indexp = NULL;
int len;
struct rtattr * tb[XFRMA_MAX+1];
int ntb;
char res_buf[NLMSG_BUF_SIZE];
struct nlmsghdr *res_n;
struct xfrm_userpolicy_info *res_xpinfo;
struct xfrm_user_tmpl tmpls_cur[XFRM_MAX_DEPTH];
int ntmpls_cur = 0;
struct xfrm_user_tmpl tmpls_new[XFRM_MAX_DEPTH];
int ntmpls_new = 0;
struct {
struct nlmsghdr n;
struct xfrm_userpolicy_info xpinfo;
char buf[RTA_BUF_SIZE];
} req_upd;
memset(tmpls_cur, 0, sizeof(tmpls_cur));
memset(tmpls_new, 0, sizeof(tmpls_new));
memset(&req, 0, sizeof(req));
req.n.nlmsg_len = NLMSG_LENGTH(sizeof(req.xpid));
req.n.nlmsg_flags = NLM_F_REQUEST;
req.n.nlmsg_type = XFRM_MSG_GETPOLICY;
while (argc > 0) {
if (strcmp(*argv, "dir") == 0) {
if (dirp)
duparg("dir", *argv);
dirp = *argv;
NEXT_ARG();
xfrm_policy_dir_parse(&req.xpid.dir, &argc, &argv);
} else if (strcmp(*argv, "sel") == 0) {
if (selp)
duparg("sel", *argv);
selp = *argv;
NEXT_ARG();
xfrm_selector_parse(&req.xpid.sel, &argc, &argv);
if (preferred_family == AF_UNSPEC)
preferred_family = req.xpid.sel.family;
} else if (strcmp(*argv, "index") == 0) {
if (indexp)
duparg("index", *argv);
indexp = *argv;
NEXT_ARG();
if (get_u32(&req.xpid.index, *argv, 0))
invarg("\"INDEX\" is invalid", *argv);
} else if (strcmp(*argv, "tmpl") == 0) {
struct xfrm_user_tmpl *tmpl;
if (ntmpls_new >= sizeof(tmpls_new) / sizeof(struct xfrm_user_tmpl)) {
fprintf(stderr, "Too many tmpls: buffer overflow: %d\n", ntmpls_new);
exit(1);
}
tmpl = &tmpls_new[ntmpls_new];
ntmpls_new ++;
memset(tmpl, 0, sizeof(*tmpl));
tmpl->family = preferred_family;
tmpl->aalgos = (~(__u32)0);
tmpl->ealgos = (~(__u32)0);
tmpl->calgos = (~(__u32)0);
NEXT_ARG();
if (strcmp(*argv, "remain") == 0) {
if (modify == 0)
invarg("invalid with merge command", *argv);
/*
* do nothing;
* id.proto = 0 will be assumed remain one
* after here.
*/
} else
xfrm_tmpl_parse(tmpl, &argc, &argv);
} else
invarg("unknown", *argv);
argc--; argv++;
}
if (!dirp) {
fprintf(stderr, "Not enough information: \"DIR\" is required.\n");
exit(1);
}
if (!selp && !indexp) {
fprintf(stderr, "Not enough information: either \"SELECTOR\" or \"INDEX\" is required.\n");
exit(1);
}
if (rtnl_open_byproto(&rth, 0, NETLINK_XFRM) < 0)
exit(1);
if (req.xpid.sel.family == AF_UNSPEC)
req.xpid.sel.family = AF_INET;
memset(res_buf, 0, sizeof(res_buf));
res_n = (struct nlmsghdr *)res_buf;
/* try to get an existing policy */
if (rtnl_talk(&rth, &req.n, 0, 0, res_n, NULL, NULL) < 0)
exit(2);
res_xpinfo = (struct xfrm_userpolicy_info *)NLMSG_DATA(res_n);
len = res_n->nlmsg_len - NLMSG_LENGTH(sizeof(*res_xpinfo));
if (len < 0) {
fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
return -1;
}
memset(tb, 0, sizeof(tb));
ntb = parse_rtattr_byindex(tb, XFRM_MAX_DEPTH, XFRMP_RTA(res_xpinfo), len);
ntmpls_cur = 0;
xfrm_tmpl_extract(tb, ntb, tmpls_cur, &ntmpls_cur);
memset(&req_upd, 0, sizeof(req_upd));
req_upd.n.nlmsg_len = NLMSG_LENGTH(sizeof(req_upd.xpinfo));
req_upd.n.nlmsg_flags = NLM_F_REQUEST|flags;
req_upd.n.nlmsg_type = XFRM_MSG_UPDPOLICY;
memcpy(&req_upd.xpinfo, res_xpinfo, sizeof(req_upd.xpinfo));
switch (modify) {
case 0:
/* merging templates */
xfrm_tmpl_merge(tmpls_cur, ntmpls_cur, tmpls_new, ntmpls_new,
req.xpid.dir, &req_upd.n, sizeof(req_upd));
break;
case 1:
/* changing templates */
xfrm_tmpl_change(tmpls_cur, ntmpls_cur, tmpls_new, ntmpls_new,
req.xpid.dir, &req_upd.n, sizeof(req_upd));
break;
case 2:
/* replacing templates */
xfrm_tmpl_replace(tmpls_cur, ntmpls_cur, tmpls_new, ntmpls_new,
req.xpid.dir, &req_upd.n, sizeof(req_upd));
break;
default:
/* not reached */
fprintf(stderr, "Internal error\n");
exit(1);
}
if (req_upd.xpinfo.sel.family == AF_UNSPEC)
req_upd.xpinfo.sel.family = AF_INET;
/* update with new poilcy */
if (rtnl_talk(&rth, &req_upd.n, 0, 0, NULL, NULL, NULL) < 0)
exit(2);
rtnl_close(&rth);
return 0;
}
static int xfrm_policy_delete(int argc, char **argv)
{
return xfrm_policy_get_or_delete(argc, argv, 1, NULL);
}
static int xfrm_policy_get(int argc, char **argv)
{
char buf[NLMSG_BUF_SIZE];
struct nlmsghdr *n = (struct nlmsghdr *)buf;
memset(buf, 0, sizeof(buf));
xfrm_policy_get_or_delete(argc, argv, 0, n);
if (xfrm_policy_print(NULL, n, (void*)stdout) < 0) {
fprintf(stderr, "An error :-)\n");
exit(1);
}
return 0;
}
/*
* With an existing policy of nlmsg, make new nlmsg for deleting the policy
* and store it to buffer.
*/
int xfrm_policy_keep(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
{
struct xfrm_buffer *xb = (struct xfrm_buffer *)arg;
struct rtnl_handle *rth = xb->rth;
struct xfrm_userpolicy_info *xpinfo = NLMSG_DATA(n);
int len = n->nlmsg_len;
struct nlmsghdr *new_n;
struct xfrm_userpolicy_id *xpid;
if (n->nlmsg_type != XFRM_MSG_NEWPOLICY) {
fprintf(stderr, "Not a policy: %08x %08x %08x\n",
n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
return 0;
}
len -= NLMSG_LENGTH(sizeof(*xpinfo));
if (len < 0) {
fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
return -1;
}
if (!xfrm_policy_filter_match(xpinfo))
return 0;
if (xb->offset > xb->size) {
fprintf(stderr, "Flush buffer overflow\n");
return -1;
}
new_n = (struct nlmsghdr *)(xb->buf + xb->offset);
new_n->nlmsg_len = NLMSG_LENGTH(sizeof(*xpid));
new_n->nlmsg_flags = NLM_F_REQUEST;
new_n->nlmsg_type = XFRM_MSG_DELPOLICY;
new_n->nlmsg_seq = ++rth->seq;
xpid = NLMSG_DATA(new_n);
memcpy(&xpid->sel, &xpinfo->sel, sizeof(xpid->sel));
xpid->dir = xpinfo->dir;
xpid->index = xpinfo->index;
xb->offset += new_n->nlmsg_len;
xb->nlmsg_count ++;
return 0;
}
static int xfrm_policy_list_or_flush(int argc, char **argv, int flush)
{
struct rtnl_handle rth;
if (argc > 0)
filter.use = 1;
filter.xpinfo.sel.family = preferred_family;
while (argc > 0) {
if (strcmp(*argv, "dir") == 0) {
NEXT_ARG();
xfrm_policy_dir_parse(&filter.xpinfo.dir, &argc, &argv);
filter.dir_mask = XFRM_FILTER_MASK_FULL;
} else if (strcmp(*argv, "sel") == 0) {
NEXT_ARG();
xfrm_selector_parse(&filter.xpinfo.sel, &argc, &argv);
if (preferred_family == AF_UNSPEC)
preferred_family = filter.xpinfo.sel.family;
} else if (strcmp(*argv, "index") == 0) {
NEXT_ARG();
if (get_u32(&filter.xpinfo.index, *argv, 0))
invarg("\"INDEX\" is invalid", *argv);
filter.index_mask = XFRM_FILTER_MASK_FULL;
} else if (strcmp(*argv, "action") == 0) {
NEXT_ARG();
if (strcmp(*argv, "allow") == 0)
filter.xpinfo.action = XFRM_POLICY_ALLOW;
else if (strcmp(*argv, "block") == 0)
filter.xpinfo.action = XFRM_POLICY_BLOCK;
else
invarg("\"action\" value is invalid\n", *argv);
filter.action_mask = XFRM_FILTER_MASK_FULL;
} else if (strcmp(*argv, "priority") == 0) {
NEXT_ARG();
if (get_u32(&filter.xpinfo.priority, *argv, 0))
invarg("\"PRIORITY\" is invalid", *argv);
filter.priority_mask = XFRM_FILTER_MASK_FULL;
} else
invarg("unknown", *argv);
argc--; argv++;
}
if (rtnl_open_byproto(&rth, 0, NETLINK_XFRM) < 0)
exit(1);
if (flush) {
struct xfrm_buffer xb;
char buf[NLMSG_FLUSH_BUF_SIZE];
int i;
xb.buf = buf;
xb.size = sizeof(buf);
xb.rth = &rth;
for (i = 0; ; i++) {
xb.offset = 0;
xb.nlmsg_count = 0;
if (show_stats > 1)
fprintf(stderr, "Flush round = %d\n", i);
if (rtnl_wilddump_request(&rth, preferred_family, XFRM_MSG_GETPOLICY) < 0) {
perror("Cannot send dump request");
exit(1);
}
if (rtnl_dump_filter(&rth, xfrm_policy_keep, &xb, NULL, NULL) < 0) {
fprintf(stderr, "Flush terminated\n");
exit(1);
}
if (xb.nlmsg_count == 0) {
if (show_stats > 1)
fprintf(stderr, "Flush completed\n");
break;
}
if (rtnl_send(&rth, xb.buf, xb.offset) < 0) {
perror("Failed to send flush request\n");
exit(1);
}
if (show_stats > 1)
fprintf(stderr, "Flushed nlmsg count = %d\n", xb.nlmsg_count);
xb.offset = 0;
xb.nlmsg_count = 0;
}
} else {
if (rtnl_wilddump_request(&rth, preferred_family, XFRM_MSG_GETPOLICY) < 0) {
perror("Cannot send dump request");
exit(1);
}
if (rtnl_dump_filter(&rth, xfrm_policy_print, stdout, NULL, NULL) < 0) {
fprintf(stderr, "Dump terminated\n");
exit(1);
}
}
rtnl_close(&rth);
exit(0);
}
int do_xfrm_policy(int argc, char **argv)
{
if (argc < 1)
return xfrm_policy_list_or_flush(0, NULL, 0);
#if 0
/*
* NLM_F_X is not supported for xfrm in the kernel.
*/
if (matches(*argv, "add") == 0)
return xfrm_policy_modify(XFRM_MSG_NEWPOLICY, NLM_F_CREATE|NLM_F_EXCL,
argc-1, argv+1);
if (matches(*argv, "change") == 0 || strcmp(*argv, "chg") == 0)
return xfrm_policy_modify(XFRM_MSG_NEWPOLICY, NLM_F_REPLACE,
argc-1, argv+1);
if (matches(*argv, "replace") == 0)
return xfrm_policy_modify(XFRM_MSG_NEWPOLICY, NLM_F_CREATE|NLM_F_REPLACE,
argc-1, argv+1);
if (matches(*argv, "prepend") == 0)
return xfrm_policy_modify(XFRM_MSG_NEWPOLICY, NLM_F_CREATE,
argc-1, argv+1);
if (matches(*argv, "append") == 0)
return xfrm_policy_modify(XFRM_MSG_NEWPOLICY, NLM_F_CREATE|NLM_F_APPEND,
argc-1, argv+1);
if (matches(*argv, "test") == 0)
return xfrm_policy_modify(XFRM_MSG_NEWPOLICY, NLM_F_EXCL,
argc-1, argv+1);
#endif
if (matches(*argv, "add") == 0)
return xfrm_policy_modify(XFRM_MSG_NEWPOLICY, 0,
argc-1, argv+1);
if (matches(*argv, "update") == 0)
return xfrm_policy_modify(XFRM_MSG_UPDPOLICY, 0,
argc-1, argv+1);
if (matches(*argv, "merge") == 0)
return xfrm_policy_tmpl_modify(XFRM_MSG_UPDPOLICY, 0,
argc-1, argv+1, 0);
if (matches(*argv, "change") == 0)
return xfrm_policy_tmpl_modify(XFRM_MSG_UPDPOLICY, 0,
argc-1, argv+1, 1);
if (matches(*argv, "replace") == 0)
return xfrm_policy_tmpl_modify(XFRM_MSG_UPDPOLICY, 0,
argc-1, argv+1, 2);
if (matches(*argv, "delete") == 0 || matches(*argv, "del") == 0)
return xfrm_policy_delete(argc-1, argv+1);
if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
|| matches(*argv, "lst") == 0)
return xfrm_policy_list_or_flush(argc-1, argv+1, 0);
if (matches(*argv, "get") == 0)
return xfrm_policy_get(argc-1, argv+1);
if (matches(*argv, "flush") == 0)
return xfrm_policy_list_or_flush(argc-1, argv+1, 1);
if (matches(*argv, "help") == 0)
usage();
fprintf(stderr, "Command \"%s\" is unknown, try \"ip xfrm policy help\".\n", *argv);
exit(-1);
}
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