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-rw-r--r--conf.c12
-rw-r--r--netlink.c232
-rw-r--r--netlink.h6
-rw-r--r--pasta.c20
4 files changed, 162 insertions, 108 deletions
diff --git a/conf.c b/conf.c
index 8fa5322..2c2eb05 100644
--- a/conf.c
+++ b/conf.c
@@ -651,10 +651,8 @@ 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(NL_GET, ifi, 0, AF_INET,
- &ip4->addr, &ip4->prefix_len, NULL);
- }
+ if (IN4_IS_ADDR_UNSPECIFIED(&ip4->addr))
+ nl_addr_get(ifi, AF_INET, &ip4->addr, &ip4->prefix_len, NULL);
if (!ip4->prefix_len) {
in_addr_t addr = ntohl(ip4->addr.s_addr);
@@ -704,9 +702,9 @@ 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(NL_GET, ifi, 0, AF_INET6,
- IN6_IS_ADDR_UNSPECIFIED(&ip6->addr) ? &ip6->addr : NULL,
- &prefix_len, &ip6->addr_ll);
+ nl_addr_get(ifi, AF_INET6,
+ IN6_IS_ADDR_UNSPECIFIED(&ip6->addr) ? &ip6->addr : NULL,
+ &prefix_len, &ip6->addr_ll);
memcpy(&ip6->addr_seen, &ip6->addr, sizeof(ip6->addr));
memcpy(&ip6->addr_ll_seen, &ip6->addr_ll, sizeof(ip6->addr_ll));
diff --git a/netlink.c b/netlink.c
index a41dc63..a10e84c 100644
--- a/netlink.c
+++ b/netlink.c
@@ -334,17 +334,76 @@ next:
}
/**
- * nl_addr() - Get/set/copy IP addresses for given interface and address family
- * @op: Requested operation
+ * nl_addr_get() - Get IP address for given interface and address family
* @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 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 on NL_GET
+ * @addr: Global address to fill
+ * @prefix_len: Mask or prefix length, to fill (for IPv4)
+ * @addr_l: Link-scoped address to fill (for IPv6)
+ */
+void nl_addr_get(unsigned int ifi, sa_family_t af, void *addr,
+ int *prefix_len, void *addr_l)
+{
+ struct req_t {
+ struct nlmsghdr nlh;
+ struct ifaddrmsg ifa;
+ } req = {
+ .nlh.nlmsg_type = RTM_GETADDR,
+ .nlh.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | NLM_F_DUMP,
+ .nlh.nlmsg_len = sizeof(req),
+ .nlh.nlmsg_seq = nl_seq++,
+
+ .ifa.ifa_family = af,
+ .ifa.ifa_index = ifi,
+ };
+ struct nlmsghdr *nh;
+ char buf[NLBUFSIZ];
+ ssize_t n;
+
+ if ((n = nl_req(0, buf, &req, req.nlh.nlmsg_len)) < 0)
+ return;
+
+ for (nh = (struct nlmsghdr *)buf;
+ NLMSG_OK(nh, n) && nh->nlmsg_type != NLMSG_DONE;
+ nh = NLMSG_NEXT(nh, n)) {
+ struct ifaddrmsg *ifa = (struct ifaddrmsg *)NLMSG_DATA(nh);
+ struct rtattr *rta;
+ size_t na;
+
+ if (nh->nlmsg_type != RTM_NEWADDR)
+ continue;
+
+ if (ifa->ifa_index != ifi)
+ continue;
+
+ for (rta = IFA_RTA(ifa), na = RTM_PAYLOAD(nh); RTA_OK(rta, na);
+ rta = RTA_NEXT(rta, na)) {
+ if (rta->rta_type != IFA_ADDRESS)
+ continue;
+
+ if (af == AF_INET) {
+ memcpy(addr, RTA_DATA(rta), RTA_PAYLOAD(rta));
+ *prefix_len = ifa->ifa_prefixlen;
+ } else if (af == AF_INET6 && addr &&
+ ifa->ifa_scope == RT_SCOPE_UNIVERSE) {
+ memcpy(addr, RTA_DATA(rta), RTA_PAYLOAD(rta));
+ }
+
+ if (addr_l &&
+ af == AF_INET6 && ifa->ifa_scope == RT_SCOPE_LINK)
+ memcpy(addr_l, RTA_DATA(rta), RTA_PAYLOAD(rta));
+ }
+ }
+}
+
+/**
+ * nl_add_set() - Set IP addresses for given interface and address family
+ * @ifi: Interface index
+ * @af: Address family
+ * @addr: Global address to set
+ * @prefix_len: Mask or prefix length to set
*/
-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_addr_set(unsigned int ifi, sa_family_t af, void *addr, int prefix_len)
{
struct req_t {
struct nlmsghdr nlh;
@@ -364,125 +423,112 @@ void nl_addr(enum nl_op op, unsigned int ifi, unsigned int ifi_ns,
} a6;
} set;
} req = {
- .nlh.nlmsg_type = op == NL_SET ? RTM_NEWADDR : RTM_GETADDR,
- .nlh.nlmsg_flags = NLM_F_REQUEST,
+ .nlh.nlmsg_type = RTM_NEWADDR,
+ .nlh.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK |
+ NLM_F_CREATE | NLM_F_EXCL,
.nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
.nlh.nlmsg_seq = nl_seq++,
.ifa.ifa_family = af,
- .ifa.ifa_index = op == NL_SET ? ifi_ns : ifi,
- .ifa.ifa_prefixlen = op == NL_SET ? *prefix_len : 0,
+ .ifa.ifa_index = ifi,
+ .ifa.ifa_prefixlen = prefix_len,
+ .ifa.ifa_scope = RT_SCOPE_UNIVERSE,
};
- ssize_t n, nlmsgs_size;
- struct ifaddrmsg *ifa;
- struct nlmsghdr *nh;
- struct rtattr *rta;
char buf[NLBUFSIZ];
- size_t na;
- if (op == NL_SET) {
- if (af == AF_INET6) {
- size_t rta_len = RTA_LENGTH(sizeof(req.set.a6.l));
+ if (af == AF_INET6) {
+ size_t rta_len = RTA_LENGTH(sizeof(req.set.a6.l));
- /* By default, strictly speaking, it's duplicated */
- req.ifa.ifa_flags = IFA_F_NODAD;
+ /* By default, strictly speaking, it's duplicated */
+ req.ifa.ifa_flags = IFA_F_NODAD;
- req.nlh.nlmsg_len = offsetof(struct req_t, set.a6)
- + sizeof(req.set.a6);
+ req.nlh.nlmsg_len = offsetof(struct req_t, set.a6)
+ + sizeof(req.set.a6);
- memcpy(&req.set.a6.l, addr, sizeof(req.set.a6.l));
- req.set.a6.rta_l.rta_len = rta_len;
- req.set.a4.rta_l.rta_type = IFA_LOCAL;
- memcpy(&req.set.a6.a, addr, sizeof(req.set.a6.a));
- req.set.a6.rta_a.rta_len = rta_len;
- req.set.a6.rta_a.rta_type = IFA_ADDRESS;
- } else {
- size_t rta_len = RTA_LENGTH(sizeof(req.set.a4.l));
-
- req.nlh.nlmsg_len = offsetof(struct req_t, set.a4)
- + sizeof(req.set.a4);
+ memcpy(&req.set.a6.l, addr, sizeof(req.set.a6.l));
+ req.set.a6.rta_l.rta_len = rta_len;
+ req.set.a4.rta_l.rta_type = IFA_LOCAL;
+ memcpy(&req.set.a6.a, addr, sizeof(req.set.a6.a));
+ req.set.a6.rta_a.rta_len = rta_len;
+ req.set.a6.rta_a.rta_type = IFA_ADDRESS;
+ } else {
+ size_t rta_len = RTA_LENGTH(sizeof(req.set.a4.l));
- req.set.a4.l = req.set.a4.a = *(uint32_t *)addr;
- req.set.a4.rta_l.rta_len = rta_len;
- req.set.a4.rta_l.rta_type = IFA_LOCAL;
- req.set.a4.rta_a.rta_len = rta_len;
- req.set.a4.rta_a.rta_type = IFA_ADDRESS;
- }
+ req.nlh.nlmsg_len = offsetof(struct req_t, set.a4)
+ + sizeof(req.set.a4);
- req.ifa.ifa_scope = RT_SCOPE_UNIVERSE;
- req.nlh.nlmsg_flags |= NLM_F_CREATE | NLM_F_ACK | NLM_F_EXCL;
- } else {
- req.nlh.nlmsg_flags |= NLM_F_DUMP;
+ req.set.a4.l = req.set.a4.a = *(uint32_t *)addr;
+ req.set.a4.rta_l.rta_len = rta_len;
+ req.set.a4.rta_l.rta_type = IFA_LOCAL;
+ req.set.a4.rta_a.rta_len = rta_len;
+ req.set.a4.rta_a.rta_type = IFA_ADDRESS;
}
- if ((n = nl_req(op == NL_SET, buf, &req, req.nlh.nlmsg_len)) < 0)
- return;
+ nl_req(1, buf, &req, req.nlh.nlmsg_len);
+}
- if (op == NL_SET)
+/**
+ * nl_addr_dup() - Copy IP addresses for given interface and address family
+ * @ifi: Interface index in outer network namespace
+ * @ifi_ns: Interface index in target namespace
+ * @af: Address family
+ */
+void nl_addr_dup(unsigned int ifi, unsigned int ifi_ns, sa_family_t af)
+{
+ struct req_t {
+ struct nlmsghdr nlh;
+ struct ifaddrmsg ifa;
+ } req = {
+ .nlh.nlmsg_type = RTM_GETADDR,
+ .nlh.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP,
+ .nlh.nlmsg_len = sizeof(req),
+ .nlh.nlmsg_seq = nl_seq++,
+
+ .ifa.ifa_family = af,
+ .ifa.ifa_index = ifi,
+ .ifa.ifa_prefixlen = 0,
+ };
+ char buf[NLBUFSIZ], resp[NLBUFSIZ];
+ ssize_t n, nlmsgs_size;
+ struct nlmsghdr *nh;
+
+ if ((n = nl_req(0, buf, &req, sizeof(req))) < 0)
return;
- nh = (struct nlmsghdr *)buf;
nlmsgs_size = n;
- for ( ; NLMSG_OK(nh, n); nh = NLMSG_NEXT(nh, n)) {
+ for (nh = (struct nlmsghdr *)buf;
+ NLMSG_OK(nh, n) && nh->nlmsg_type != NLMSG_DONE;
+ nh = NLMSG_NEXT(nh, n)) {
+ struct ifaddrmsg *ifa;
+ struct rtattr *rta;
+ size_t na;
+
if (nh->nlmsg_type != RTM_NEWADDR)
- goto next;
+ continue;
- 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;
- }
+ 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)) {
+ if (ifa->ifa_scope == RT_SCOPE_LINK || ifa->ifa_index != ifi) {
ifa->ifa_family = AF_UNSPEC;
- goto next;
+ continue;
}
- if (ifa->ifa_index != ifi)
- goto next;
-
- if (op == NL_DUP)
- ifa->ifa_index = ifi_ns;
+ ifa->ifa_index = ifi_ns;
for (rta = IFA_RTA(ifa), na = RTM_PAYLOAD(nh); RTA_OK(rta, na);
rta = RTA_NEXT(rta, na)) {
- if (op == NL_DUP && rta->rta_type == IFA_LABEL)
+ if (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) {
- memcpy(addr, RTA_DATA(rta), RTA_PAYLOAD(rta));
- *prefix_len = ifa->ifa_prefixlen;
- } else if (af == AF_INET6 && addr &&
- ifa->ifa_scope == RT_SCOPE_UNIVERSE &&
- IN6_IS_ADDR_UNSPECIFIED(addr)) {
- memcpy(addr, RTA_DATA(rta), RTA_PAYLOAD(rta));
- }
-
- if (addr_l &&
- af == AF_INET6 && ifa->ifa_scope == RT_SCOPE_LINK &&
- IN6_IS_ADDR_UNSPECIFIED(addr_l))
- memcpy(addr_l, RTA_DATA(rta), RTA_PAYLOAD(rta));
}
-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);
- }
+ nl_req(1, resp, buf, nlmsgs_size);
}
/**
diff --git a/netlink.h b/netlink.h
index 980ac44..5ac972d 100644
--- a/netlink.h
+++ b/netlink.h
@@ -16,8 +16,10 @@ 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(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_addr_get(unsigned int ifi, sa_family_t af, void *addr,
+ int *prefix_len, void *addr_l);
+void nl_addr_set(unsigned int ifi, sa_family_t af, void *addr, int prefix_len);
+void nl_addr_dup(unsigned int ifi, unsigned int ifi_ns, sa_family_t af);
void nl_link_get_mac(int ns, unsigned int ifi, void *mac);
void nl_link_set_mac(int ns, unsigned int ifi, void *mac);
void nl_link_up(int ns, unsigned int ifi, int mtu);
diff --git a/pasta.c b/pasta.c
index cb509dd..b55a1a2 100644
--- a/pasta.c
+++ b/pasta.c
@@ -282,21 +282,29 @@ void pasta_ns_conf(struct ctx *c)
if (c->pasta_conf_ns) {
enum nl_op op_routes = c->no_copy_routes ? NL_SET : NL_DUP;
- enum nl_op op_addrs = c->no_copy_addrs ? NL_SET : NL_DUP;
nl_link_up(1, c->pasta_ifi, c->mtu);
if (c->ifi4) {
- nl_addr(op_addrs, c->ifi4, c->pasta_ifi, AF_INET,
- &c->ip4.addr, &c->ip4.prefix_len, NULL);
+ if (c->no_copy_addrs) {
+ nl_addr_set(c->pasta_ifi, AF_INET,
+ &c->ip4.addr, c->ip4.prefix_len);
+ } else {
+ nl_addr_dup(c->ifi4, c->pasta_ifi, AF_INET);
+ }
+
nl_route(op_routes, c->ifi4, c->pasta_ifi, AF_INET,
&c->ip4.gw);
}
if (c->ifi6) {
- int prefix_len = 64;
- nl_addr(op_addrs, c->ifi6, c->pasta_ifi, AF_INET6,
- &c->ip6.addr, &prefix_len, NULL);
+ if (c->no_copy_addrs) {
+ nl_addr_set(c->pasta_ifi, AF_INET6,
+ &c->ip6.addr, 64);
+ } else {
+ nl_addr_dup(c->ifi6, c->pasta_ifi, AF_INET6);
+ }
+
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 2024-11-10 23:04:11 +0000