From e89da3cf03b2e301504f0d9c45db8e6056e66beb Mon Sep 17 00:00:00 2001 From: Stefano Brivio Date: Sun, 14 May 2023 18:44:53 +0200 Subject: netlink: Add functionality to copy addresses from outer namespace Similarly to what we've just done with routes, support NL_DUP for addresses (currently not exposed): nl_addr() can optionally copy mulitple addresses to the target namespace, by fixing up data from the dump with appropriate flags and interface index, and repeating it back to the kernel on the socket opened in the target namespace. Link-local addresses are not copied: the family is set to AF_UNSPEC, which means the kernel will ignore them. Same for addresses from a mismatching address (pre-4.19 kernels without support for NETLINK_GET_STRICT_CHK). Ignore IFA_LABEL attributes by changing their type to IFA_UNSPEC, because in general they will report mismatching names, and we don't really need to use labels as we already know the interface index. Signed-off-by: Stefano Brivio Reviewed-by: David Gibson --- conf.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) (limited to 'conf.c') 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); -- cgit v1.2.3