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-rw-r--r--conf.c8
-rw-r--r--netlink.c62
-rw-r--r--netlink.h4
-rw-r--r--pasta.c8
4 files changed, 58 insertions, 24 deletions
diff --git a/conf.c b/conf.c
index 404c7bc..cb1e09a 100644
--- a/conf.c
+++ b/conf.c
@@ -645,8 +645,10 @@ static unsigned int conf_ip4(unsigned int ifi,
if (IN4_IS_ADDR_UNSPECIFIED(&ip4->gw))
nl_route(NL_GET, ifi, 0, AF_INET, &ip4->gw);
- if (IN4_IS_ADDR_UNSPECIFIED(&ip4->addr))
- nl_addr(0, ifi, AF_INET, &ip4->addr, &ip4->prefix_len, NULL);
+ if (IN4_IS_ADDR_UNSPECIFIED(&ip4->addr)) {
+ nl_addr(NL_GET, ifi, 0, AF_INET,
+ &ip4->addr, &ip4->prefix_len, NULL);
+ }
if (!ip4->prefix_len) {
in_addr_t addr = ntohl(ip4->addr.s_addr);
@@ -696,7 +698,7 @@ static unsigned int conf_ip6(unsigned int ifi,
if (IN6_IS_ADDR_UNSPECIFIED(&ip6->gw))
nl_route(NL_GET, ifi, 0, AF_INET6, &ip6->gw);
- nl_addr(0, ifi, AF_INET6,
+ nl_addr(NL_GET, ifi, 0, AF_INET6,
IN6_IS_ADDR_UNSPECIFIED(&ip6->addr) ? &ip6->addr : NULL,
&prefix_len, &ip6->addr_ll);
diff --git a/netlink.c b/netlink.c
index d93ecda..bc5b2bf 100644
--- a/netlink.c
+++ b/netlink.c
@@ -334,19 +334,18 @@ next:
}
/**
- * nl_addr() - Get/set IP addresses
- * @ns: Use netlink socket in namespace
- * @ifi: Interface index
+ * nl_addr() - Get/set/copy IP addresses for given interface and address family
+ * @op: Requested operation
+ * @ifi: Interface index in outer network namespace
+ * @ifi_ns: Interface index in target namespace for NL_SET, NL_DUP
* @af: Address family
- * @addr: Global address to fill if zero, to set if not, ignored if NULL
+ * @addr: Global address to fill on NL_GET, to set on NL_SET
* @prefix_len: Mask or prefix length, set or fetched (for IPv4)
- * @addr_l: Link-scoped address to fill, NULL if not requested
+ * @addr_l: Link-scoped address to fill on NL_GET
*/
-void nl_addr(int ns, unsigned int ifi, sa_family_t af,
- void *addr, int *prefix_len, void *addr_l)
+void nl_addr(enum nl_op op, unsigned int ifi, unsigned int ifi_ns,
+ sa_family_t af, void *addr, int *prefix_len, void *addr_l)
{
- int set = addr && ((af == AF_INET6 && !IN6_IS_ADDR_UNSPECIFIED(addr)) ||
- (af == AF_INET && *(uint32_t *)addr));
struct req_t {
struct nlmsghdr nlh;
struct ifaddrmsg ifa;
@@ -365,23 +364,23 @@ void nl_addr(int ns, unsigned int ifi, sa_family_t af,
} a6;
} set;
} req = {
- .nlh.nlmsg_type = set ? RTM_NEWADDR : RTM_GETADDR,
+ .nlh.nlmsg_type = op == NL_SET ? RTM_NEWADDR : RTM_GETADDR,
.nlh.nlmsg_flags = NLM_F_REQUEST,
.nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
.nlh.nlmsg_seq = nl_seq++,
.ifa.ifa_family = af,
.ifa.ifa_index = ifi,
- .ifa.ifa_prefixlen = *prefix_len,
+ .ifa.ifa_prefixlen = op == NL_SET ? *prefix_len : 0,
};
+ ssize_t n, nlmsgs_size;
struct ifaddrmsg *ifa;
struct nlmsghdr *nh;
struct rtattr *rta;
char buf[NLBUFSIZ];
- ssize_t n;
size_t na;
- if (set) {
+ if (op == NL_SET) {
if (af == AF_INET6) {
size_t rta_len = RTA_LENGTH(sizeof(req.set.a6.l));
@@ -416,21 +415,47 @@ void nl_addr(int ns, unsigned int ifi, sa_family_t af,
req.nlh.nlmsg_flags |= NLM_F_DUMP;
}
- if ((n = nl_req(ns, buf, &req, req.nlh.nlmsg_len)) < 0 || set)
+ if ((n = nl_req(op == NL_SET, buf, &req, req.nlh.nlmsg_len)) < 0)
+ return;
+
+ if (op == NL_SET)
return;
nh = (struct nlmsghdr *)buf;
+ nlmsgs_size = n;
+
for ( ; NLMSG_OK(nh, n); nh = NLMSG_NEXT(nh, n)) {
if (nh->nlmsg_type != RTM_NEWADDR)
goto next;
+ if (op == NL_DUP) {
+ nh->nlmsg_seq = nl_seq++;
+ nh->nlmsg_pid = 0;
+ nh->nlmsg_flags &= ~NLM_F_DUMP_FILTERED;
+ nh->nlmsg_flags |= NLM_F_REQUEST | NLM_F_ACK |
+ NLM_F_CREATE;
+ }
+
ifa = (struct ifaddrmsg *)NLMSG_DATA(nh);
+
+ if (op == NL_DUP && (ifa->ifa_scope == RT_SCOPE_LINK ||
+ ifa->ifa_index != ifi)) {
+ ifa->ifa_family = AF_UNSPEC;
+ goto next;
+ }
+
if (ifa->ifa_index != ifi)
goto next;
+ if (op == NL_DUP)
+ ifa->ifa_index = ifi_ns;
+
for (rta = IFA_RTA(ifa), na = RTM_PAYLOAD(nh); RTA_OK(rta, na);
rta = RTA_NEXT(rta, na)) {
- if (rta->rta_type != IFA_ADDRESS)
+ if (op == NL_DUP && rta->rta_type == IFA_LABEL)
+ rta->rta_type = IFA_UNSPEC;
+
+ if (op == NL_DUP || rta->rta_type != IFA_ADDRESS)
continue;
if (af == AF_INET && addr && !*(uint32_t *)addr) {
@@ -451,6 +476,13 @@ next:
if (nh->nlmsg_type == NLMSG_DONE)
break;
}
+
+ if (op == NL_DUP) {
+ char resp[NLBUFSIZ];
+
+ nh = (struct nlmsghdr *)buf;
+ nl_req(1, resp, nh, nlmsgs_size);
+ }
}
/**
diff --git a/netlink.h b/netlink.h
index 217cf1e..cd0e666 100644
--- a/netlink.h
+++ b/netlink.h
@@ -16,8 +16,8 @@ void nl_sock_init(const struct ctx *c, bool ns);
unsigned int nl_get_ext_if(sa_family_t af);
void nl_route(enum nl_op op, unsigned int ifi, unsigned int ifi_ns,
sa_family_t af, void *gw);
-void nl_addr(int ns, unsigned int ifi, sa_family_t af,
- void *addr, int *prefix_len, void *addr_l);
+void nl_addr(enum nl_op op, unsigned int ifi, unsigned int ifi_ns,
+ sa_family_t af, void *addr, int *prefix_len, void *addr_l);
void nl_link(int ns, unsigned int ifi, void *mac, int up, int mtu);
#endif /* NETLINK_H */
diff --git a/pasta.c b/pasta.c
index c2fb1f4..798aeb6 100644
--- a/pasta.c
+++ b/pasta.c
@@ -278,16 +278,16 @@ void pasta_ns_conf(struct ctx *c)
nl_link(1, c->pasta_ifi, c->mac_guest, 1, c->mtu);
if (c->ifi4) {
- nl_addr(1, c->pasta_ifi, AF_INET, &c->ip4.addr,
- &c->ip4.prefix_len, NULL);
+ nl_addr(NL_SET, c->ifi4, c->pasta_ifi, AF_INET,
+ &c->ip4.addr, &c->ip4.prefix_len, NULL);
nl_route(op_routes, c->ifi4, c->pasta_ifi, AF_INET,
&c->ip4.gw);
}
if (c->ifi6) {
int prefix_len = 64;
- nl_addr(1, c->pasta_ifi, AF_INET6, &c->ip6.addr,
- &prefix_len, NULL);
+ nl_addr(NL_SET, c->ifi6, c->pasta_ifi, AF_INET6,
+ &c->ip6.addr, &prefix_len, NULL);
nl_route(op_routes, c->ifi6, c->pasta_ifi, AF_INET6,
&c->ip6.gw);
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-17 05:51:16 +0000