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It makes no sense for a container or a guest to try and perform duplicate address detection for their link-local address, as we'll anyway not relay neighbour solicitations with an unspecified source address. While they perform duplicate address detection, the link-local address is not usable, which prevents us from bringing up especially containers and communicate with them right away via IPv6. This is not enough to prevent DAD and reach the container right away: we'll need a couple more patches. As we send NLM_F_REPLACE requests right away, while we still have to read out other addresses on the same socket, we can't use nl_do(): keep track of the last sequence we sent (last address we changed), and deal with the answers to those NLM_F_REPLACE requests in a separate loop, later. Link: https://github.com/containers/podman/pull/23561#discussion_r1711639663 Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
32 lines
1.2 KiB
C
32 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later
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* Copyright (c) 2021 Red Hat GmbH
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* Author: Stefano Brivio <sbrivio@redhat.com>
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*/
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#ifndef NETLINK_H
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#define NETLINK_H
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extern int nl_sock;
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extern int nl_sock_ns;
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void nl_sock_init(const struct ctx *c, bool ns);
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unsigned int nl_get_ext_if(int s, sa_family_t af);
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int nl_route_get_def(int s, unsigned int ifi, sa_family_t af, void *gw);
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int nl_route_set_def(int s, unsigned int ifi, sa_family_t af, const void *gw);
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int nl_route_dup(int s_src, unsigned int ifi_src,
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int s_dst, unsigned int ifi_dst, sa_family_t af);
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int nl_addr_get(int s, unsigned int ifi, sa_family_t af,
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void *addr, int *prefix_len, void *addr_l);
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int nl_addr_set(int s, unsigned int ifi, sa_family_t af,
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const void *addr, int prefix_len);
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int nl_addr_set_ll_nodad(int s, unsigned int ifi);
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int nl_addr_dup(int s_src, unsigned int ifi_src,
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int s_dst, unsigned int ifi_dst, sa_family_t af);
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int nl_link_get_mac(int s, unsigned int ifi, void *mac);
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int nl_link_set_mac(int s, unsigned int ifi, const void *mac);
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int nl_link_set_mtu(int s, unsigned int ifi, int mtu);
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int nl_link_set_flags(int s, unsigned int ifi,
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unsigned int set, unsigned int change);
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#endif /* NETLINK_H */
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