diff options
| author | Christoph Hellwig <hch@lst.de> | 2020-05-28 07:12:33 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-05-28 11:11:46 -0700 |
| commit | 18d5ad62327576cbb1e5b9938a59d63ac0c15832 (patch) | |
| tree | bbe7e26b179b2198e8dcce03c59554851e180b87 /include | |
| parent | fce934949c0f0003c1777fbf8c0706ba82a8cf7e (diff) | |
ipv6: add ip6_sock_set_addr_preferences
Add a helper to directly set the IPV6_ADD_PREFERENCES sockopt from kernel
space without going through a fake uaccess.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
| -rw-r--r-- | include/net/ipv6.h | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/include/net/ipv6.h b/include/net/ipv6.h index 49c4abf99148..9a9075983016 100644 --- a/include/net/ipv6.h +++ b/include/net/ipv6.h @@ -1195,4 +1195,71 @@ static inline void ip6_sock_set_recverr(struct sock *sk) release_sock(sk); } +static inline int __ip6_sock_set_addr_preferences(struct sock *sk, int val) +{ + unsigned int pref = 0; + unsigned int prefmask = ~0; + + /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */ + switch (val & (IPV6_PREFER_SRC_PUBLIC | + IPV6_PREFER_SRC_TMP | + IPV6_PREFER_SRC_PUBTMP_DEFAULT)) { + case IPV6_PREFER_SRC_PUBLIC: + pref |= IPV6_PREFER_SRC_PUBLIC; + prefmask &= ~(IPV6_PREFER_SRC_PUBLIC | + IPV6_PREFER_SRC_TMP); + break; + case IPV6_PREFER_SRC_TMP: + pref |= IPV6_PREFER_SRC_TMP; + prefmask &= ~(IPV6_PREFER_SRC_PUBLIC | + IPV6_PREFER_SRC_TMP); + break; + case IPV6_PREFER_SRC_PUBTMP_DEFAULT: + prefmask &= ~(IPV6_PREFER_SRC_PUBLIC | + IPV6_PREFER_SRC_TMP); + break; + case 0: + break; + default: + return -EINVAL; + } + + /* check HOME/COA conflicts */ + switch (val & (IPV6_PREFER_SRC_HOME | IPV6_PREFER_SRC_COA)) { + case IPV6_PREFER_SRC_HOME: + prefmask &= ~IPV6_PREFER_SRC_COA; + break; + case IPV6_PREFER_SRC_COA: + pref |= IPV6_PREFER_SRC_COA; + break; + case 0: + break; + default: + return -EINVAL; + } + + /* check CGA/NONCGA conflicts */ + switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) { + case IPV6_PREFER_SRC_CGA: + case IPV6_PREFER_SRC_NONCGA: + case 0: + break; + default: + return -EINVAL; + } + + inet6_sk(sk)->srcprefs = (inet6_sk(sk)->srcprefs & prefmask) | pref; + return 0; +} + +static inline int ip6_sock_set_addr_preferences(struct sock *sk, bool val) +{ + int ret; + + lock_sock(sk); + ret = __ip6_sock_set_addr_preferences(sk, val); + release_sock(sk); + return ret; +} + #endif /* _NET_IPV6_H */ |